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Converter of temperature difference energy with liquid metal electrode Invention relates to capacitance converters of energy and may be used to supply low-capacity energy loads under climatic conditions with sufficient periodical temperature difference. The device comprises two capacitance plates, one of which is fixed, and the second one, movable, is made of liquid metal, for instance, mercury. The device also comprises a bar from any dielectric heat-sensitive material, having high variation of its linear dimensions in case of change of external temperature. The second end of this bar is rigidly fixed on the fixed base. Between the fixed plate of the capacitor and the unfixed end of the bar from dielectric heat sensitive material there is a material placed, which has high relative dielectric permeability, for instance, segnetoelectric. At the same time one part of the dielectric is tightly fixed to the fixed capacitance plate, and the opposite part faces the unfixed end of the bar. Between this part of segnetoelectric and the end of the bar there is a small air gap arranged, in which a small amount of mercury is placed. Thus the device creates a reservoir, in which one of movable plates is liquid metal, for instance, mercury. The device also has a source of DC excitation and contacts required for capacitance charging. |
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Invention relates to the field of electric engineering and may be used to recognise contamination and/or formation of dew on components of an AC frequency converter with an intermediate voltage circuit. In the method to recognise contamination and/or formation of dew, at least, during the process of preliminary charge of the intermediate circuit capacitor, having at least one capacitor, the AC frequency converter with the intermediate voltage circuit, a time characteristic is determined for the pulse current of partial discharge, besides, using this current pulse, a frequency spectrum is calculated, and depending on the result a warning is activated on contamination and/or a warning on dew formation. |
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Twelve-phase stepdown autotransformer converter of phase number Invention relates to converting equipment and may be used to create variable AC and DC electric drives and comprises a stepdown autotransformer, having three coils (1, 2 and 3) of the primary winding and six coils (4, 5, 6, 7, 8, 9) of the secondary windings connected to each other by assemblies A, B, C, D, E, F, having each two taps (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21) from turns. Each coil (4, 5, 6, 7, 8, 9) of the secondary winding is the side of the hexagon, converting a symmetrical three-phase system of voltages into a symmetrical six-phase one. Taps (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21) from turns of coils (4, 5, 6, 7, 8, 9) of the secondary winding represent outlets of voltages of the twelve-phase system of voltages. |
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Power conversion system comprises a power converter, using multiple branches to convert inlet electric power and discharge capacities into multiple phases. Each branch comprises upper and lower arms; a controller 30 that controls the upper and lower arm of each branch, in order to control pulse current passing via the branch. The controller 30 calculates a command of duration of connection for each branch in one period of control for each phase and for the first and second branches from multiple branches, provided for one determined phase, changes the phase of the calculated command of connection duration, so that the time period, when the positive pulse current flows via the first branch, and the time period, when the negative pulse current flows through the second branch, cover each other in one control period. |
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Device for balancing adjustment of cable voltages Device comprises the first, second, third terminals of phases of the cable and the fourth terminal of zero wire, three capacitors, three throttles, output terminals, the first, second and third voltage relays, each of which is equipped with one opening and two closing contacts, specified throttles of appropriate phases are connected between appropriate phases of cable and identical output terminals, three identical current switchboards are introduced, and three identical serial current switchboards. |
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Invention relates to the field of electric engineering and may be used in converters within a power supply system of electronic, electromechanical and lighting equipment. In the method of power ratio corrector control during the interval of positive half-wave of the supply voltage of the grid the first power key is maintained in the connected condition, and control pulses arrive to the second power key. During the interval of the negative half-wave of the supply voltage of the grid the second power key is maintained in the connected condition, and control pulses arrive to the first power key, at the same time the inlet voltage is measured by the control system based on the digital signal processor with the help of two half-wave rectifiers with identical division ratios. |
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AC voltage rectifier comprises an ohmic area, to which AC voltage is supplied, via an insulating area connected to provide a good thermal contact to a thermoelectric structure, from which DC voltage is taken. At the same time in order to achieve a technical result at a certain distance from the surface of the ohmic area there is a solar concentrator fixed on a holder, performing additional heating of the ohmic area, besides, the distance between the ohmic area and solar concentrator corresponds to the focus distance of lenses within the solar concentrator. The surface of the thermoelectric structure opposite to the one contacting with the ohmic area, is coupled with a thermal accumulator, made in the form of a reservoir with a salt solution, having low cryohydrate temperature of dissolution, periodical adding of which into the appropriate reservoir is carried out with a special batcher. |
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Transformer with three-phase and circular windings Invention relates to electric engineering and may be used in multi-phase semiconductor converters, in particular, in rectifiers, inverters and frequency converters. A transformer with rotary magnetic field, three-phase and circular windings comprises an inner laminated magnetic conductor made of plates with semi-closed slots for full height of coil groups, where a three-phase winding and a circular winding are laid with taps. An external laminated magnetic conductor in the form of a hollow cylinder, which is moved onto the inner laminated magnetic conductor with an air gap, providing for necessary linearity of the main magnetisation curve by rotary magnetic field, providing for improved spectral composition of the magnetic field curve, and closing main magnetic flux, developed by windings arranged in slots of the inner magnetic conductor. |
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Device is composed of the following components: at least one power switch, to one output of which input voltage is applied, the other output is connected to the input of a transformer-rectifier assembly, at the output of which output voltage is generated, arriving to one input of a voltage divider and further via a comparison device to a summator, in which it is added to the signal of the first current sensor, connected in the circuit of the power switch, and arrives to the input of the control unit, comprising a width-pulse modulator and a current comparator, where the control signal is generated, arriving to the third output of the power switch. The transformer-rectifier assembly comprises the second current sensor, from the output of which the signal on the output current arrives to one input of the parallel operation assembly, the other input is connected to the output "PARAL", connected during parallel operation of sources of secondary power supply, and the outlet is connected to the other input of the voltage divider. |
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AC voltage rectifier comprises an ohmic area, to which AC voltage is supplied, via an insulating area connected to provide proper thermal contact to a thermoelectric structure, from which DC voltage is taken. At the same time at a certain distance from the ohmic area surface there is a solar concentrator fixed on a holder, which additionally heats the ohmic area, besides, the distance between the ohmic area and the solar concentrator corresponds to the focus distance of lenses, included into the composition of the solar concentrator, and the surface of the thermoelectric structure opposite to the one in contact with the ohmic area is blown with a ventilating unit. |
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AC voltage rectifier comprises an ohmic area, to which AC voltage is supplied, via an insulating area connected to provide proper thermal contact to a thermoelectric structure, from which DC voltage is taken. At the same time a heat source made in the form of a through reservoir with geothermal water is coupled to the surface of the ohmic area that is opposite to the one in contact with the thermoelectric structure, and the surface of the thermoelectric structure opposite to the one in contact with the ohmic area is coupled with a ventilating unit. |
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Astable single-phase converter Device relates to the field of pulse equipment and is designed to convert DC voltage. The objective of the invention is to increase efficiency of an astable single-phase converter. The device comprises a switching key VT1, a comparison device DA1, a CMOS inverter, the first divider R3, R4 and the second divider R1, R2. The resistor R2 is current-setting. The switching key VT1 via an inductance coil L1 is connected between terminals of the primary source GB, and the inlet of the second divider is connected to the source of shift Ush, which may be the primary source GB. Terminals of supply of the CMOS inverter DD1 are connected to the same source. Intervals of inductance coil charge and discharge time in this device are determined by the inductance coil itself. |
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Single-phase astable converter Proposed device relates to the field of pulse equipment, namely, to DC current or voltage converters. The main area of application of the converter is conversion of rectified grid voltage into lower voltages or DC current, however, devices of the proposed type may be used in any transformer converters and also converters with inductive load. The converter comprises a key transistor (1), the output electrode of which via a transformer is connected to the load, a resistor-sensor of current (2), a circuit of negative feedback (3), a threshold element (4), a voltage feedback circuit (5), a voltage amplifier (6) with a double-phase output, a source of power supply (7). The difference of the proposed device from the prototype is application of the double-phase voltage amplifier (6) connected between the output of the threshold element (4) and the input of the key transistor. |
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Magnetic integral symmetrical converter Invention relates to electrical engineering. Magnetic integral symmetrical converter with an integral function of a transformer and an inductor includes the following: an integral magnetic element having a magnetic core with three magnetic columns, which includes at least three windings (Np, NS1, NS2) and at least one air gap for energy accumulation, where primary winding (Np) and the first secondary winding (NS1) are wound about the first magnetic column or both of them are wound about the second magnetic column and the third magnetic column, and the second secondary winding (NS2) is wound about the second magnetic column, and a hollow output current flows along the second secondary winding (NS2); a symmetrically operating inverter circuit with two outputs, which acts on primary winding (Np); and a group of synchronous rectifiers (SR1, SR2), the control signals of electrodes of the lock of which and the control signals of electrodes of the lock of a group of diodes of a power supply switch (S1, S2) of the symmetrically operating inverter circuit with two outputs complement each other. |
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Invention relates to converter equipment. In order to obtain submodule (13) for charging or discharging of energy accumulator (22) with capacitor unit (14) and circuit (15) of power semiconductor instruments, which includes connected and disconnected power semiconductor instruments (16, 17), with that, capacitor unit (14) and circuit (15) of power semiconductor instruments are connected to each other so that depending on control of power semiconductor instruments (16, 17) on output terminals (19, 20) of submodule (1) there shaped is voltage decreasing on the capacitor, or zero voltage, with that, submodule (13) provides for individual coordination of a charging process with requirements of the corresponding energy accumulator, and besides, it is cheap, it is proposed to connect energy accumulator (22) to submodule (13) through stabiliser (21) of constant voltage so that stabiliser (21) of constant voltage is connected to capacitor unit (14) and equipped for conversion of capacitor voltage (Uc) decreasing on capacitor unit (14) to charging voltage required for charging of energy accumulator (22), as well as for conversion of discharging voltage (EL) decreasing at discharge on energy accumulator (22) to voltage (Uc) of the capacitor. |
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Device for connection to resistor having mainly inductive nature This invention relates to a device for connection to resistor (2) having mainly inductive nature. Device includes reactive element (3A, 3B, 3C). Besides, the device is provided with outputs (U1, U2, W1, W2, V1, V2) for introduction of output signals of electrical inverters for parallel supply, and at least one output for connection to a supply terminal for a resistance phase so that the device is created mainly for filtration of a high-frequency differential component of at least two output signals during usage. |
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Stable current source includes in-series connected filter, transformer with an interrupting transformer connected to primary winding and a rectifying diode in secondary winding, after which a low-pass filter with a measuring shunt in an output current circuit is installed, the measurement outputs of which are connected to a voltage-to-frequency converter, the output frequency of which is supplied through a galvanic isolation element to the input of a frequency-pulse modulator controlling the switch frequency of the interrupting transistor. |
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Direct to alternate current converter Direct to alternate current converter includes direct voltage source with capacitor at the output, bridge voltage inverter consisting of four switch elements composed of a transistor and reverse diode each, with direct current outputs connected to direct voltage source outputs and alternate voltage outputs connected to primary winding of transformer, secondary winding of which is connected to a load, and control system. Hall sensor is built in magnetic conductor of the transformer, sensor output connected to control system input with its outputs connected to inputs of first and second drivers, each driver controlling two serial switch elements of bridge voltage inverter. |
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Method of direct to alternate voltage converter and device for method implementation Method of converter operation and device for method implementation involve direct to alternate voltage converter functioning as SEPIC converter: when positive half-wave of output alternate voltage is formed, energy accumulated in reactor is supplied to primary transformer winding, and during generation of negative half-wave of output alternate voltage energy accumulated in first capacitor is supplied to primary transformer winding. Direct to alternate voltage converter includes first and second semiconductor switches of direct to alternate voltage converter, acting as a synchronous rectifier; input direct voltage circuits of the converter have galvanic isolation from output alternate voltage circuits of the converter. |
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Voltage converter of power source includes multilevel power source voltage converter with possible output of multiple levels of the first voltage at one out of two output terminals via multiple conductive tracks; first power accumulator and first switching element with possible direct connection to the first output terminal and connection or disconnection of the first power accumulator to or from the first conductive track so as to combine voltage level of the first power accumulator with the first voltage level as a second voltage fed to second output terminal. With this topology, voltage rating of each poser semiconductor devices can be maintained at lower method without changes in the number of power semiconductor devices. In addition, VDRM is lower compared to standard topology. It allows for cost reduction and reliability improvement. |
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Method of bidirectional switch control in three-level semiconductor rectifier Rectangular voltage pulse is generated, with middles of generated rectangular pulses synchronised with phase voltage of power supply network by moments of voltage transition over zero, effective value of first harmonic of rectifier phase current is measured, angle δ is calculated by expression , where ω is circular frequency of phase voltage of power supply network; L is phase inductance of rectifier; I1 is effective value of first harmonic in input phase current of rectifier; U1 is effective value of first harmonic in phase voltage of power supply network, generated rectangular pulses are phase-shifted back by δ angle, then fed to control inputs of bidirectional switches of three-phase three-level semiconductor rectifier. |
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Isolation in electric power transmission system Invention refers mainly to power transmission lines, particularly to substation of power transmission system. Substation features converter including first set of serial converter gate elements between first and second potentials, so that absolute value of the second potential is higher than absolute value of the first potential, and second set of converter gate elements, including at least one converter gate element between second and third potential. Absolute value of the third potential is higher than absolute value of the second potential, and all converter gate elements of the second set are positioned inside one or more cases located on long pole-type isolation. Potential of pole-type isolation end where the cases are located lies between the second and third potentials, and the other end of the pole-type isolation has "earth" potential. |
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Multizone direct to alternate current converter Invention can be applied in controlled AC drives and as a controlled second converter in frequency converters with intermediate DC stage. Device includes current source, 3-phase bridge circuit where each bridge arm consists of 2 groups of n serial controlled unidirectional rectifier cells, to connection points of which at each bridge arm two extra groups of uncontrolled rectifier cells are added so that one group of n controlled rectifier cells is connected by cathode of the outmost cell to a load and by anode of the other outmost cell to positive pole of current source, second group of controlled rectifier cells is connected by anode of outmost cell to a load and with cathode to negative pole of current source, diodes of the first extra group, with its cathodes towards the load, are inserted between anode of serial controlled rectifier cells and load, and similarly, diodes of the second extra group, with its anodes towards the load, are inserted between cathodes of controlled rectifier cells of the second group and load. |
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Method of single-cycle voltage converter control and device for method implementation (versions) Invention refers to electric converter devices and can be used in secondary electric power sources. Substance of method involves switch element opening at the moment of final demagnetising magnetic conductor in output converter during generation of relative span of open and closed state of electronic power switch element. Devices implementing the method include low-current control switch in converter control track, and discrete feedback signal of core demagnetising in output converter is fed to controlled input of the switch directly from primary winding (from demagnetising winding in the second variant) and prohibits power switch opening till the end of core demagnetising. |
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Invention refers to electric engineering and can be used for control of resonance power converter. Method of switch device (260) control involves resonance circuit (350) supplied with switching voltage (Uwr) for resonance current (Ires), generation to ensure required output power (rP) at the output of resonance power converter (100). Device is adapted to the method of switching device control. In addition, resonance power converter includes control device for implementation of the control method. |
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Device of alternate current generator frequency transformation Invention refers to electrical engineering and can be applied for supply of voltage with variable frequency and amplitude to various electric loads. Device includes three synchronous multiphase generators with a common drive, three multiphase-single-phase cycloconverters with direct link, thyristor control system, three-phase control generator, frequency setter and amplitude setter, with outputs of each synchronous generator connected to power inputs of respective cycloconverter, excitation windings of all three synchronous generators connected in star pattern to outputs of cycloconverter control systems, and amplitude setter output connected to second input of control generator. Device includes adjustable direct voltage source, additional amplitude setter, additional excitation windings in rotor of each synchronous generator, additional three-phase winding in stator of each synchronous generator, with same-sign additional three-phase windings of all synchronous generators connected in series to form three branches combined in star pattern and forming three-phase output with stable voltage frequency, and additional excitation windings in rotor of each synchronous generator are combined in open delta pattern, to open ends of which adjustable direct voltage source is connected with additional amplitude setter. |
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Magnetising current limiter for transformer of push-pull voltage converter Invention is related to devices converting direct current to direct current, and namely to control systems of such devices and it may be used in push-pull voltage converters in order to limit magnetising current of the transformer. The substance of the invention consists in the following. Current sensors generate signals proportional to currents passing through the primary and secondary windings. A magnetising current valuator generates a signal proportional to magnetising current equal to the difference in current of the primary winding and adjusted current of the secondary winding. The input voltage sensor generates a signal proportional to supply voltage of the converter. The received signal is used as the reference for determination of a limitation level for magnetising current. The comparator generates a logical "1" when magnetising current is more than the reference signal and a logical "0" when magnetising current is less than the reference signal. A comparator, a pulse-width modulator and logic gates AND generate control signals for the push-pull voltage converter. |
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Twenty four-phase converter of three-phase-voltage-to-constant voltage Proposed converter serves to supply DC consumers that demand high quality conversion at various levels of the rectified voltage. The suggested converter comprises four symmetrical three-phase power sources and five in-sequence gate groups, the outermost groups consist of three gates coupled into anode and cathode gate deltas, which common points form output leads of the device while the remaining three groups are made as six-gate rings with three pairs of diametrical connection points of the same gate electrodes. Adjacent gate rings are connected at three points each formed by a free pair of the point of connection between the electrodes in the adjacent ring gates. The converter is equipped with twenty one additional gates, gates of the six-gate rings are made as controlled ones, and three additional gates are also made as controlled ones, while the remaining ones are uncontrolled. |
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Device for connecting controlled voltage inverter to direct current voltage source Device comprises current limiting circuits, one circuit per each input terminal of a rectifier, each circuit couples the input terminal of the above device connected to one of the output terminals of the above voltage source with the output terminal of the above device connected to one of the input terminals of the controlled voltage rectifier; each current limiting circuit consists of an inductive element, the first and second reactors, a capacitor as well as the first and second switches, in each current limiting circuit in the device there is an auxiliary parallel damping resistor and the third switch, which are coupled between the first terminal of the inductive element and the first terminal of the capacitor. |
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Three-phase inverter of variable structure Device contains a direct-current source, stand-alone single-phase inverters, a transformer with a rotating magnetic field containing the primary and secondary windings, contact blocks and a direct-current source, which includes two accumulators and five power-circuit switches, each of four contact blocks comprises three power-circuit switches, two inputs and three outputs, at that the secondary windings are placed at the stator at an angle of 120°, and their beginnings serve as the three-phase outputs of the device while their ends are joined and form the delta-connected three-phase winding. |
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Invention is related to the field of engineering and may be used in uninterrupted power supply (UPS) systems and inverters. The method and device solving the problem of mismatch between UPS systems of non-sinusoidal oscillations and loads with active power factor compensation (PDC) includes the following stages when non-sinusoidal oscillations to be delivered as a load (e.g., voltage fluctuations) are generated with relative pulse duration of pulse-width modulation (PWM); discretisation of these non-sinusoidal oscillations to accumulate output signal readings and regulation of relative pulse duration to control non-sinusoidal oscillations depending on output signal readings in order to deliver the desired signal characteristic (e.g., mean-square signal level) as a load. In the embodiments the relative output pulse duration is regulated in different ways in case of growing and lowering power consumption by the load respectively. |
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Power supply source for electric installations Device comprises three-phase rectifier with a filter loaded to voltage inverter with load, for example, with parallel LC-circuit, the inverter control unit coupled to the reference voltage setting unit and a voltage sensor, a current sensor, a temperature sensor and a pulse-width modulator; there is an additional matching transformer, an additional source of constant voltage and a bridge saturable core reactor, at that secondary winding of the matching transformer is connected to the load while primary winding is coupled to the above inverter through the in-series first diagonal of bridge saturable core reactor and current sensor, the second diagonal of the saturable core reactor is shunted by the linear choke and diode and connected through a key to the source of constant voltage, at that the key is installed in parallel to diode and is coupled through the input to the control circuit based on pulse-width modulator. |
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Twelve-phase transformer-coupled phase converter Invention is related to converter equipment and may be used for manufacturing of rectifiers for direct and alternating-current electric controlled drives in order to improve their operational speed. Twelve-phase transformer-coupled phase converter consists of a three-phase converter having three wye- (or delta-) connected coils of the primary winding coupled to the three-phase network with zero wire, six interconnected coils of the secondary windings with taps from turns. Each coil of the secondary winding of the transformer is a side of the hexagon circuit that converts a symmetric three-phase system of voltage into six-phase system of voltage. Each tap of the secondary winding coil turn is one of outputs of the symmetric twelve-phase voltage system of the converter. Voltage of the twelve-phase voltage system depends on a voltage value of the six-phase system and is related to it as per the following ratio: U12=U6Cos30°/Cos15°=0.897U6. |
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Invention is related to a capacitive power supply unit, moreover to an electronic device equipped with the capacitive power supply unit. To this end at the first facility the capacitive power supply unit contains an input part (10) having input contacts (Ln, Nt) to connect an alternating-current source and a capacitive coupling; a rectifying part (20) connected through the capacitive coupling to the input contacts (Ln, Nt) and an output part (30) connected to the rectifying part, there's an auxiliary device (R1) limiting start-up current where output contacts (V+, V-) are connected to the respective contacts of a device (D5) limiting output voltage, and in-series capacitive impedance (Zdc) conducting direct current has a resistive component with a resistive value equal to at least 0.2 of the first circuit resistive value. At the second facility the electronic device contains a power input (101), (102) for connection to the supply mains; a capacitive power supply unit (110) coupled to the power input; the first functional unit (140) receiving power supply from the capacitive power supply unit. |
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Reactive power control systems, devices and methods Invention is related to the field of electric engineering and may be used for reactive power control in power supply systems for such devices as digging machines of different type, which are used for mining operations. The approximate defined embodiments can provide an adapted system, a device, manufacture, a scheme and/or a user interface and/or a method and/or a machine-readable medium containing instructions for activities that can contain by means of the preset data device for the preset digging machine consisting of a variety of active input cascades, at that each active input cascade is coupled electrically to the AC power mains of the above digging machine, each active input cascade is adapted to supply DC power to the DC bus, the above DC bus is coupled electrically to a variety of inverters and each inverter is adapted to supply AC power to at least one operating motor, an active power control is formed by each active input cascade in an independent way. |
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Control device for flyback converter Device contains a transformer for the insulated voltage flyback converter, a diode, a secondary circuit with load and a switching element, at that one output of the switching element is connected to anode of the first diode while its cathode is connected to the summator input and to one input of the primary transformer winding, by the other input this winding is connected to the power supply bus; the second output of the switching element is coupled to the common bus at the side of the transformer primary winding; the third output of the switching element is coupled to the control device output; secondary winding though the secondary circuit is connected to the load; the summator is connected to the power supply bus by its one input and to the output of the controlled signal source by its other input, while its output is connected to the input of a measuring instrument; the measuring instrument has two input coupled to the tripping pulse generator; he tripping pulse generator is connected to the control device input. |
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Invention pertains to the field of electrical engineering and can be used in (1) a power supply source. The power-supply source circuit contains: input contacts (17, 19) intended for connection of the power-supply source circuit (1) to the direct-current energy source circuit (7), two output contacts intended for connection of the load circuit (11) the power-supply source circuit (1), a bridge circuit (3) containing at least two in-series switches (M1, M2) interconnected between two output contacts, a resonant circuit (5) connected at its one end to one or more input contacts and at its other end to the interconnecting track (15) of at least two switches (M1, M2) of the bridge circuit (3) and at least two diodes (D1, D2), at that the first diode (D1) is coupled between the first input contact intended to connect a positive contact of the direct-current energy source (7) and the first end contact of the in-series switches. The first end contact is connected to the first output contact, the second diode (D2) is coupled between the input contact intended for connection to a negative contact of the energy source circuit (7) and the second end contact of the in-series switches, at that the second end contact is connected to the second output contact. |
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Control method and control device used for shunting of power supply units Control method for shunting of power supply units includes the following steps: measurement of the first three-phase output eclectic signal; calculation of the first direct and reverse sequences of the first three-phase output eclectic signal; generating of the preset components for direct and reverse sequences of phases in order to perform automatic compensation for the components of the first direct and reverse sequences thus outputting components of the second direct and reverse sequences; summing-up of the second direct and reverse sequences and output of the second three-phase output eclectic signal in the preset mode. |
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Invention is related to the field of electric engineering and power electronics and can be used for design of alternating-current generation systems or AC uninterrupted power supply systems with a voltage inverter. In the suggested method for control of a static converter in an alternating-current generation system in short-circuit conditions load current is measured and when it reaches the preset value a control signal for the voltage converter is changed providing the maximum value of short-circuit current thus regulating the direct-current value at the inverter input, stabilising short-circuit current in the load during a certain period of time. |
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Voltage adder in electric mains Invention can be used mainly in countryside and suburb nursery gardens which power supply is made from transformer substations (TS) with rather long overhead power lines and at the ends of such lines mains voltage decreases to an unaccepted level thus deteriorating quality of services rendered by the energy service companies. The device consists of two bridge circuits with different conductivity direction for positive and negative alternating voltage half-periods respectively connected in parallel to the mains conductors, each of the circuits include two circuits of the in-series electrolytic capacitor and power transistor. Free outputs of capacitors in the first and second branches of each bridge circuit are connected to the phase and neutral conductors of the mains, at diagonal lines of the bridge circuits there are thyristors ensuring in-series connection of capacitors in each bridge circuit to the mains conductors in the second and fourth quarter-periods of alternating voltage respectively for the first and second bridge circuits and operational control of transistors and thyristors as per the set algorithm is carried out by a control unit for transistors and thyristors. |
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Method to arrange grouped operation of reversible converters Clock frequency synchronisation of a slave converter is made with the master one, balance of output currents for the converters at the permitted unbalance is attained by recording of the load characteristic for each separate device where by means of a control system an initial value of load current is set, load resistance is changed at the recorded current setting, values of voltage and current are measured at the selected point and compared, the phase shift and pulse duty cycle are also measured at the output of these devices at a stage of their designing. After that they are compared and tuned in order to ensure identical load characteristics, phase and pulse duty cycle of the output current values with error not exceeding 2-5%. |
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Power conversion device consists of the following components: switching elements (S1-S6) which are connected in parallel to the common current-conducting bus and excite currents with different phases; and a controller (14) of the electric motor which controls the respective switching elements (S1-S6). The controller (14) of the electric motor controls the respective switching elements (S1-S6) so that the direction of current fluctuation stipulated by switching on/off of one switching element is opposite to the direction of current fluctuation stipulated by switching on/off of at least one of other switching elements. |
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Application: in the field of electrical engineering. Inverter generator contains the first, second and third inverters, the first, second and third controllers to control ON/OFF switching of the inverter switching elements as well as control of the first inverter as the master and the second and third inverter as slaves, a three-phase output, a single-phase output and a motor control module to send an output signal of the selector switch to the first controller, etc. Thus three-phase or single-phase alternating current is supplied by means of such control of ON/OFF switching of the inverter switching elements so that at the output of the first, second and third inverters at the selector switch signal the three-phase or single-phase alternating current is present, at that the output signal of the first inverter becomes a reference one. |
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Three-phase capacitance transducer for power supply of active load Invention relates to electrical engineering. Three-phase capacitance transducer for power supply of active load contains two groups of in-series connected diode and storage capacitor and two groups of in-series connected thyristor and integrating capacitor connected in parallel to the respective storage capacitors. At that the two groups of in-series connected diode and storage capacitor are connected to two phases of the three-phase electrical mains as per voltage doubling circuit (Latour scheme), integrating capacitors from the groups of in-series connected thyristor and integrating capacitor are interconnected in-series and in parallel to the active load and a protective device while control electrodes of thyristors are connected to the thyristor control unit which inputs are connected to the three-phase electrical mains. The thyristor control unit contains a resistor voltage summator-divider, a comparator and two control circuits. The first circuit consists of in-series inverter, the first differentiating circuit, the first trigger pulse univibrator with power amplifier and the first output transformer while the second circuit consists of the in-series second differentiating circuit, the second trigger pulse univibrator with power amplifier and the second output transformer. |
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Synchronising device for power supply systems with neutral wire Claimed device includes auxiliary busbars A2, B2, C2, six summators and two adaptive non-periodic first order filters that ensure filtration for the three-phase voltage system at minimum required quantity of non-periodic filtering stages based on the generalised vector image of the three-phase sequence. |
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Voltage booster for three-phase transmission power line Voltage booster consists of an electronic return current choke installed in the line run separation at the power transmission tower where voltage in its wires complies with the lowest permitted value of 198V for each phase and of a switchable energy accumulator installed at the terminal of a power transmission line. At that current passage through the electronic return current choke and accumulation of energy in the switchable energy accumulator take place in the first and third quarters of harmonic voltage periods in the electric mains while discharge of energy accumulating elements into the terminal load of the power transmission line is made with a certain time delay in the second and fourth quarters of harmonic voltage periods in the electric mains. The switchable energy accumulator is assembled as per the bridge scheme of two conductors - phase and zero conductors - connected in parallel and circuits of two in-series accumulating LC-lines of delay and bidirectional transistor commutator. Free ends of accumulating LC-lines of delay in these circuits are connected respectively to the phase and zero conductor of the mains and in the diagonal lines of the bridge scheme there is a bidirectional triode thyristor ensuring in-series connection of the accumulating LC-lines of delay in the second and fourth quarters of the mains voltage periods and their discharge into the load of the terminal zone of the power transmission line. At that control of operation of bidirectional transistor commutators in the bridge scheme, its bidirectional triode thyristor and switching transistors of the electronic return current choke is performed from the control unit of transistors and bidirectional triode thyristor. |
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Device for controlling or stabilising single-phase or three-phase voltage Invention relates to electrical engineering. The device for controlling or stabilising single-phase or three-phase voltage includes an actuating element in form of two series-connected step-down and step-up transformers, and a control unit. One part of the core of the step-down transformer and one part of the core of the step-up transformer are in form of one part of a core which is common for both cores and is configured for mechanical displacement relative the remaining fixed part of the cores, wherein the maximum cross-section of the inserted part of the core of the step-down transformer matches the minimum cross-section of the inserted part of the core of the step-up transformer, and the minimum cross-section of the inserted part of the step-down transformer matches the maximum cross-section of the inserted part of the step-up transformer. |
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Measuring transformer and method of controlling measuring transformer Invention relates to electrical engineering. The converter comprises control units (3), which are respectively connected to one of multiple sources (2) of input voltage. Each control unit (3) varies input voltage (UIN1, UIN2, UIN3, UIN4) supplied from the connected input voltage source (2) and applies an intermediate voltage (U1, U2, U3, U4). The converter comprises switching elements (41), wherein potentials (V0, V1, V2, V3, V4) of intermediate voltages, determined by the intermediate voltages (U1, U2, U3, U4), are applied across each switching element (41) and each switching element (41) selects one of the potentials (V0, V1, V2, V3, V4) of intermediate voltage to output as the corresponding potential (VOUT1, VOUT2, VOUT3) of output voltage. The method of using such a converter comprises the following steps: setting up the control units (3) such that the control units (3) apply potentials of intermediate voltages comprising the applied potentials (VOUT1, VOUT2, VOUT3) of output voltages; setting up the switching elements (41) such that one of the potentials (V0, V1, V2, V3, V4) of intermediate voltage is selected and applied across the corresponding output (A1, A2, A3). |
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Digital converter and energy conversion device Group of inventions is related to analogue-to-digital converters and can be used in energy conversion devices for power electronics. The device contains a number of data signals storage units which can select data signals with delay equal to the preset time interval, moreover these signals specify instant value change, and store these selected values with simultaneous selection of each of these signals; a deleting unit capable to delete the maximum and minimum value from values stored at the number of data signals storage units; an averaging unit capable to take an average of values which are not deleted by the deleting unit; and a converter capable of analogue-to-digital conversion of the value outputted from the averaging unit and displaying this converted value as digital information. |
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Static reversible converter for power supply of alternating and direct-current consumers Invention is related to reversible converters designed for power supply of alternating and direct-current consumers and the system contains the first input/output port at the side of connected accumulator battery and the second input/output port at the side of alternating-current supply mains. In inverter mode direct current is supplied from the accumulator battery to the first port while alternating current is outputted from the second port. In rectifier mode input alternating current is supplied to the second port while direct current is outputted from the first port. Between the ports there are in-series interconnected high-frequency link and a link of industrial frequency self-commutated inverter. Operation of the links is controlled by the control system. The high-frequency link is made as a combined scheme of resonance inverters and voltage inverters connected in parallel by their inputs and in-series by their outputs; while in rectifier mode is works as a combined scheme of voltage inverters and rectifiers. In inverter mode all invertors but one are non-regulated. One inverter is a regulated one. Non-regulated inverters create reference output voltage (minimum required). The regulated inverter shapes additional voltage added to the reference one so that output voltage could have the required value. In the rectifier mode wiring scheme of the reversible converter operates to generate charge current for accumulator batteries. |
Another patent 2513398.