Schemes of power source
SUBSTANCE: converter circuit is shown having a main switching circuit on the primary of the transformer to control the supply of current to the storage coil in the primary winding when the main switching circuit is conductive. The converter circuit comprises: a control circuit operatively connected to the main switching circuit for controlling the main switching circuit, the control circuit comprising a control capacitor configured to include a control circuit and disconnect the main switching circuit; a secondary inductance coil magnetically coupled to the storage coil and configured to run the control circuit for operation and to disconnect the main switching circuit in response to a voltage change on the storage coil when the main switching circuit is conductive; and a charging circuit connected between the auxiliary inductor and the control capacitor and configured to include an auxiliary inductor to charge the control capacitor.
EFFECT: ensuring better stabilisation of the output voltage in the network.
14 cl, 8 dwg
SUBSTANCE: invention is related to electric engineering and may be used in control systems for electric diesel-generating sets, in particular, for control of an electromagnetic fuel control unit. The technical result consists in the fact that the method is based on the usage of a pulse-width modulation for the inverter control signal and lies in that the measured value of current to be stabilised is compared with an error amplifier with the value of required current preset by a microcontroller by means of a built-in digital-to-analogue converter, and the required pulse repetition rate is set by the generator controlled by the error amplifier for the purpose of the inverter control, at that the fixed pulse duration is determined by a pulse generator, which is started up at the beginning of each frequency period of the generator.
EFFECT: increased operation speed and accuracy of current generation due to the addition of fast-acting feedback in a current regulating circuit.
SUBSTANCE: claimed device comprises a source of direct current, voltage stabiliser, Schmitt trigger, integrating RC-circuit, a key, pulse transformer, the first and second differential voltage comparators (DVC), rectifier and filter coupled to the respective load, the first and second parallel RC-circuits, three capacitors, six diodes, six resistors and voltage limiting terminal, at that the key is based on NO gate, which output is the key input while its output is connected to the gate of switching MOS-transistor with n-channel, which drain is the first output of the key, its source is the second output of the key, at that pulse transformed comprises primary winding, n of secondary windings where n=1, 2…, and the second secondary winding.
EFFECT: improving stability of output voltage at load in the wider range of input voltage and ambient temperature values, ensuring short circuit protection in the load both for switching FET transistor with channel of n-type and source of direct current.
SUBSTANCE: invention relates to conversion equipment, particularly to high-frequency converters for converting dc voltage to high-power dc voltage with galvanic isolation of circuits, and can be used in electrical circuits of dc power sources for various purposes. The disclosed device comprises a control unit and a transformer, the primary coil of which is connected to the middle points of two diagonals of a transistor bridge, each formed by two series-connected transistors, and the secondary coil of the transformer is connected to a load through rectifier diodes and an output capacitor. According to the disclosed solution, the device further includes two transistor diagonals, each consisting of two transistors, and an additional transformer, the primary coil of which is connected to the middle points of additional transistor diagonals, and the secondary coil is connected through additional rectifier diodes to the output capacitor and to the load, wherein the control unit enables to generate four pulse sequences with partial time overlapping of one pulse with two adjacent pulses.
EFFECT: high efficiency, providing transistor switching at virtually zero current, resulting in the multifold reduction of dynamic losses on transistors of the converter.
2 cl, 3 dwg
SUBSTANCE: flyback voltage converter consists of an isolation transformer forming the primary circuit that comprises the primary winding of the transformer (T1) and a key element (VT1) and the secondary circuit that comprises the secondary winding of the transformer, a high-power diode (VD1), an output capacitor (Cout), load (Rn), a damping circuit consisting of a diode (VDsn) connected by its cathode to anode of the high-power diode (VD1) and by its anode to one output of the resistor (Rsn), by its other output the resistor is coupled to negative bus, a capacitor (Csn) coupled by its one armature to cathode of the high-power diode (VD1) while by its other armature it is coupled between the diode (VDsn) and resistor (Rsn).
EFFECT: improving efficiency factor of the converter and reducing its dimensions.
SUBSTANCE: 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.
EFFECT: invention provides for operation of sources of secondary power supply in parallel mode with various sources of input voltage.
3 cl, 7 dwg
SUBSTANCE: 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.
EFFECT: magnetic integral symmetrical converter can reduce losses on windings and scattered inductance of the primary winding side and the secondary winding side so that the technical result comprising high-efficiency energy conversion is achieved.
14 cl, 12 dwg
SUBSTANCE: 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.
EFFECT: reduced maximum current values and set power of power elements in converter, enhanced efficiency and reliability of converter.
3 cl, 2 dwg
SUBSTANCE: 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.
EFFECT: reduced fluctuation at the output of resonance power converter.
18 cl, 11 dwg
SUBSTANCE: invention relates to the field of electric engineering and its can be used in converters of direct voltage to alternating voltage - inverter-HM and voltage regulator-HM for self-sustained power supply systems and electric drives for perspective aerospace flight vehicles with predominantly or completely electric drive equipment. According to the method of direct voltage pulse conversion energy from DC power source is supplied permanently to double-capacitor rack connected to this source. By means of pulse control of two control keys at the first stage of each period of high-frequency periodic dosing energy is accumulated in a dosing choke by its connection to one of two capacitors in the rack through one closed key while the second key is open. At the second stage the energy accumulated at the first stage is transmitted to the other capacitor in the rack at open state of the keys from the dosing choke through one or two rectifier diodes. Energy accumulated in the capacitors of the rack and dosing choke and energy of the power supply source is transmitted on permanent base to AC load through bidirectional circuit between medium terminals of the power supply source and capacitance rack with periodic change of voltage value and polarity for the load at alternating half-cycles of low-frequency periodic process. At the stage of each period when load voltage increases the energy accumulated in the first capacitor of the capacitance rack and power supply source is transmitted by doses to the second capacitor and load. At the stage of the same period when load voltage decreases or remains unchanged the energy from the second capacitor of the capacitance rack and power supply source is transmitted by doses to the first capacitor and load.
EFFECT: enhancement of functionalities - receipt of output voltage with arbitrarily assigned periodic-continuous form, in particular, sinusoidal.
4 cl, 2 dwg
SUBSTANCE: invention relates to converting equipment and it can be used for power supply systems of radar stations, radio-technical facilities, automatic and computer facilities. Stabilised quasiresonant converter contains two in-series charging MIS transistors, two series-connected recuperating diodes, two series-connected capacitors, series-connected resonant capacitor and choke, power transformer, two rectifiers, two voltage dividers, filter capacitor, load resistor, modulating MIS transistor, two single-ended PLM-controllers, two control transformers, time-setting RC-circuit, emitter follower, two differentiating RC-circuits. There is measuring winding of power transformer, the second modulating MIS transistor, two single-ended PLM-controllers, three time-setting RC-circuits, two differentiating RC-circuits, the second emitter follower, two summators, integrator, filter, clock-pulse generator, trigger, two logical AND components with respective relations.
EFFECT: improving operational performance of the converter, reducing its weight and dimensions, increasing efficiency factor, improving reliability and expanding its application scope due to exclusion of magnet flux direct component in power transformer.
SUBSTANCE: protection and diagnostic method for in-series thyristors lies in stoppage of control pulses delivery as a protective measure, performance of control over state of the thyristors against reverse voltage and operating temperature of valve coolers. In the method correct operation of communication lines is controlled by pulse-phase control system against feedback response, distribution of reverse voltage is measured in each operating cycle of the valve groups. When maximum allowable temperature of the valves is exceeded or rated value of reverse voltage distribution is decreased or in case of lost connection with the pulse-phase control system protective measures are taken by removal of pulses from all thyristor groups and cutoff of the converter from the network or by removal of control pulses only. By means of the analysis for reverse voltage distribution and operating temperature of thyristors an emergency failure due to the thyristor performance degradation is prevented. The device for protection and diagnostics is described for in-series thyristors.
EFFECT: improving protective functions and ensuring diagnostics for the three-phase rectifier with in-series connection of thyristors.
2 cl, 2 dwg
SUBSTANCE: step-up voltage converter comprises an input circuit with a choke in one of branches, two power keys, two diodes, and a starting key with a resistor shunting it and two in-series output capacitors. In order to improve reliability of semiconductor elements and prevention of the core saturation upon supply of input voltage should be performed in four stages. Unbalanced conditions of the converter operation are eliminated by introduction into the scheme of two auxiliary keys controlled by two auxiliary drivers and two operating amplifiers (OA). A resistor is connected in series with each auxiliary key and each operating amplifier contains series circuits, which consist of a diode and resistor thus ensuring hysteresis of connection and disconnection of the auxiliary keys.
EFFECT: high reliability.
SUBSTANCE: invention is related to the method for discharge of intercondenser (Czk) of double-link valve voltage inverter (2), wherein the electric energy converter (4) mounted from the network side has switched power semiconductor devices (A1, …, A6); it is intended to connect alternating-current network by means of the series circuit of preset charging contactor (VS) and preset charging resistance (RV), transformer (T) and the main circuit breaker (HS) switched by the network contactor (NS). According to the invention the main circuit breaker (HS) and the network contactor (NS) are open, at that the preset charging contactor (VS) is closed, at that two diagonal opposed power semiconductor devices (A1, A4; A2, A3) of the electric energy converter (4) are switched on.
EFFECT: method for discharge of intercondenser (Czk) of double-link valve voltage inverter (2) is obtained, wherein technical result lies in lack of need in additional structural components.
2 cl, 2 dwg
SUBSTANCE: invention relates to electrical engineering. The method of detecting a fault in a pulsed electrical source (1), having a control stage (2) configured to transmit, in response to a setting signal, a control signal which is modulated with a given duty ratio value (α), to a power stage (3) configured to feed electricity to a lead (100), wherein the method includes steps of determining at least one nominal value (αmin, αmax) of the duty cycle during normal operation, and at least one breakdown threshold (αsc, αoc) as a function of the nominal value; determining at least one instantaneous value (α) of the duty cycle of a signal output by the control stage (2); and comparing the instantaneous value with the breakdown threshold. A detection circuit which carries out said method.
EFFECT: simple means of detecting and identifying faults.
6 cl, 2 dwg
SUBSTANCE: 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.
EFFECT: possibility to recognise extent of contamination and/or formation of dew, as a result of which a breakthrough with its impact may be prevented.
SUBSTANCE: 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.
EFFECT: increased efficiency of energy conversion and accuracy of operation of a single-phase bridgeless corrector of power ratio.
SUBSTANCE: 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.
EFFECT: limitation of magnetising current at the minimum permitted level within the whole range of supply voltage.
SUBSTANCE: 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.
EFFECT: reduction of dimensions and weight for the claimed device intended for connection of the input voltage device to the alternating voltage source, including weight and dimensions of the bank of capacitors in the current limiting circuits, and improvement of the dynamic performance at the non-controlled charge stage of the output capacitor of the input voltage device.
2 cl, 4 dwg
SUBSTANCE: 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.
EFFECT: reduction of weight and dimensions, increase of power factor and electric energy quality.
15 cl, 14 dwg
SUBSTANCE: in the proposed device of synchronisation between buses A, B, C and A2, B2, C2, there are seven summators and two adaptive periodical filters of the first order included, providing for filtration of a three-phase system of voltages without connection of a zero wire, and in generation of sync pulses based on comparison of voltages of a three-phase system there are another three additional summators used, which exclude a requirement of availability of a zero wire.
EFFECT: realisation of stable sync pulses for a system of control of thyristor rectifier with availability of reducing harmonic components in a supply network, without mandatory requirements of zero wire availability with using smaller quantity of filtering elements.
FIELD: reducing voltage ripples across power consumers incorporating rectifiers and inverters.
SUBSTANCE: proposed device has regulation channel, pulse source, series-connected voltage sensor, AC voltage component computing device, comparison gate, delta-modulator, and four-quadrant converter. Regulation channel has series-connected converter transformer, thyristor bridge, amplifier, and pulse distributor. Converter transformer input is connected to supply mains and pulse source output, to pulse distributor input. Voltage sensor input is connected in parallel with converter transformer primary winding and its output, to input of AC voltage component computing device and to second input of comparison gate; four-quadrant converter output is coupled with converter transformer secondary winding.
EFFECT: enhanced power output and mean time between failures.
1 cl, 3 dwg