Transistor inverter

FIELD: electricity.

SUBSTANCE: transistor inverter has an uncontrolled rectifier arranged in a bridge circuit that is connected on one side to a power line, on the other hand to the capacitor filter, to the positive and negative terminals of which is connected single-phase voltage inverter comprising four field-effect transistors, two-wheeling diode and inverter control unit, a drain of the first power transistor connected to the cathode of the first free-wheeling diode and the positive terminal of the filter capacitor, the source of the first power transistor is connected to the anode of the first free-wheeling diode, the drain of the second power transistor connected to the cathode of the second free-wheeling diode and the positive terminal of the filter capacitor, the source the second power transistor connected to the anode of the second diode is reverse, the gates of all four field transistors are connected to the inverter control unit. The voltage source inverter, the first power transistor is connected to the source of the first auxiliary transistor, the drain of which is connected to the negative terminal of the filter capacitor. The source of the second power transistor is connected to the source of the second auxiliary transistor whose drain is connected to the negative terminal of the filter capacitor. The transformer has two primary semi-windings, first and second in series and according to the forming medium output beginning of the first primary semi-windings connected to the sources of the first power transistor and the first auxiliary transistor and the end of the second primary semi-windings connected to the sources of the second power transistor and the second auxiliary transistor. To the secondary winding of the transformer, the active-inductive load is connected in parallel. To the middle pin of the transformer, the beginning of the primary winding of a three-winding choke is connected, the end of the primary winding is connected to the negative terminal of the filter capacitor. Finished auxiliary winding two winding inductor is connected to the anode of the diode of the charge storage capacitor electric power, the cathode of which is connected to one terminal of a capacitor storage of electric energy and at the same time to the anode of the thyristor, the cathode of which is connected to the middle conclusion of the transformer, the other terminal additional winding two winding inductor and a second terminal capacitor electrical energy storage device connected to the negative terminal of the filter capacitor. The gate electrode of the thyristor is connected to the inverter control unit.

EFFECT: reducing the amount of power field-effect transistors, which reduces the weight and size parameters and the key elements of the converter as a whole, increase the control range of the output voltage on the active-inductive load, providing galvanic isolation of the high-voltage inverter and the load.

2 dwg

 



 

Same patents:

Frequency converter // 2557807

FIELD: electricity.

SUBSTANCE: invention pertains to the sphere of electric engineering and power electronics, in particular to converters of electric energy designed as per the circuit of two-link electrical converters. The technical result lies in an improved efficiency of the device, reduced time period for the preparation of the converter for operation, improved reliability and improved performance. The result is reached by the addition of a transistor, diode and choke to the circuit of an electrical converter thus arranging a charging circuit for a storage capacitor. At that the limitation and stabilisation of a charging current is arranged using a fully controllable element - a transistor operating in a pulse-width modulation mode. Using the charging transistor with an insignificant rated current of the collector it is possible to implement a charging system for the storage capacitor and a diagnosing system for a DC-link and voltage inverter.

EFFECT: suggested frequency converter allows an increase in energy efficiency and operational reliability as well as an improvement in operational performance.

2 cl, 2 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and can be used in high-voltage variable-frequency electric drives for control of serviceability of an input transformer and power cells. A self-diagnostic method of a high-voltage frequency converter containing an input transformer and several levels of power cells, which are connected to each of the three phases and each of which includes a rectifier on thyristors and an inverter on IGBT transistors, consists in the fact that a control system checks serviceability of each power cell by measurement of temperature of thyristors, output voltage of the rectifier, temperature of IGBT transistors and output current of the inverter; with that, there additionally checked is state of windings of the input transformer by measurement of temperature, output voltage and current.

EFFECT: application of a self-diagnostic method of a high-voltage frequency converter will allow achieving the following technical result: improvement of electric drive functioning reliability.

3 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering and can be used for control of frequency transducer in a motor system. In the method of control of rotation electrical machine for minimizing losses related to switching in the rotation electrical machine, the iterative control method is offered which in advance calculates optimum switching states.

EFFECT: decrease of switching losses.

21 cl, 14 dwg

FIELD: electricity.

SUBSTANCE: device comprises a control system, a stand-alone voltage inverter, a braking circuit, a storage capacitor and a three-phase active converter consisting of an output three-phase choke coil and a rectifier based on semiconductor elements; in the rectifier scheme there are also changes related to its rectifying part based on thyristors and there are changes in its inverting part based on diodes coupled in series and accordantly with transistors. The positive effect of the invention consists in the operation of the reversible electricity converter due to the introduced elements with voltage in a DC-link below the voltage level of a non-controlled rectifier, and as a consequence in the expansion of its functionalities and improved efficiency and operational reliability.

EFFECT: expansion functionalities of the reversible voltage converter an minimisation of the number of elements in the electric circuit, improved operational reliability of the device; the device has a sufficient degree of universality and may be used to develop electric frequency converters within the wide range of power for both low-voltage and high-voltage applications.

3 cl, 3 dwg

FIELD: physics.

SUBSTANCE: frequency-pulse duration alternating voltage controller has an adder, an integrator, a relay element, comparators, dynamic D flip-flops, switch elements (thyristors), load resistors connected in a star circuit with a neutral terminal, a setting signal source and a three-phase voltage source. Said alternating current controller includes three dynamic D flip-flops, which enable to generate 'packets' of sinusoidal voltage across the load with a whole number of periods of mains voltage.

EFFECT: high energy efficiency.

5 dwg

FIELD: electricity.

SUBSTANCE: in a single-phase voltage inverter, according to the first version, a pulse generator is made with two antiphased outputs, every of which is connected to inputs of pulse generators in the appropriate channel. Each channel comprises generators of pulses of different duration τ1 and τ2, and antiparallel diodes are connected to transistors joined to generators of pulses with duration τ1 in each channel. According to the second version the antiparallel diodes are connected to transistors joined with generators of pulses with duration τ2 in each channel. According to the third version the control system includes a control element, the output of which is connected to additionally introduced inputs of generators of pulses with duration τ2 in each channel, the pulse generator is made with two antiphased outputs, every of which is connected to inputs of generators of pulses of the appropriate channel, and the antiparallel diodes are connected to transistors connected to generators of pulses with duration τ1 in each channel. According to the fourth version the antiparallel diodes are connected to transistors joined with generators of pulses with duration τ2 in each channel. The value of interval time between the trailing edge of the pulse with duration τ2 in one channel and the leading edge of the pulse τ1 in the other channel exceeds the time of load current drop down to zero in all versions of the single-phased voltage inverter.

EFFECT: simplified control system and increased operational reliability of the device.

4 cl, 6 dwg

FIELD: physics.

SUBSTANCE: in the method of controlling a frequency converter comprising a power supply filter, a single-phase rectifier, a clamp, a single-phase inverter on controlled rectifier diodes, a switching capacitor and switching inductor, which form a series resonant circuit with the load, control pulses are generated and successively transmitted to the rectifier diodes of the inverter, which form direct and inverse half-waves of alternating current in the load and they are switched on with frequency higher than the resonance frequency of the series resonant circuit. Instantaneous voltage across the output of the rectifier is measured. Frequency of switching on the rectifier diodes is controlled, respectively reduced and increased directly proportional to the measured instantaneous voltage across the output of the rectifier.

EFFECT: reduced current pulsation in the load of the frequency converter caused by pulsation of the output voltage of the single-phase rectifier.

2 dwg

FIELD: electricity.

SUBSTANCE: power cell is controlled, and it is taken out of operation by means of bypassing in case of failure, switched off at input and output, tested and is brought into operation at positive testing result. Control is performed as to temperature of thyristors, output voltage of rectifier, temperature of IGBT-transistors and output current of inverter. During the test there checked is condition of input fuses an if their activations fail, thyristors are activated in pairs and output voltage of rectifier is checked, and then IGBT-transistors are activated in pairs and output current of inverter is checked through ballast load.

EFFECT: improving converter reliability.

2 dwg

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electrical engineering and is highly relevant for design of power supply devices for discharge-impulse electrotechnological installations. Constant frequency stabilisation of voltage in a non-linear resonance circuit implemented within the parametric transformer secondary circuit with the circuit Q-factor QH=(ω0CR>2/m where ω0 =1/(L20C) is the resonance circuit frequency; L20, - the average paratrans output winding inductance; R - the discharge chamber resistance, m=0..1 - the paratrans inductance modulation depth factor. The proposed device for voltage stabilisation and discharge-impulse installation protection comprises a rectifier, a filter, a voltage inverter, a transformer and a discharge chamber. The inverter is of the resonance type with back-to-back diodes. The transformer is of the parametric type consisting of two butted orthogonal magnetic conductors with 2-6% of the winding wrapped around the butt joint enclosing the both magnetic conductors.

EFFECT: electrotechnological process enhancement in terms of quality and performance characteristics due to stabilisation of constant frequency supply voltage and improved operational reliability of the discharge-impulse installation due to efficient protection against overvoltage and short-circuiting.

2 cl, 5 dwg

FIELD: physics.

SUBSTANCE: multiphase converting circuit p≥3 phases (R, S, T) is proposed incorporating a converting subcircuit (1) intended for every aforesaid phase. Every said subcircuit (1) comprises rectifier (2), constant voltage circuit (3) connected to rectifying unit (2) and inverter unit (4) connected to aforesaid circuit (3). The first variable-voltage output (5) of everyone inverter unit (4) forms a phase output (6), while the second variable-voltage outputs (12) of units (4) are star-connected. In compliance with this invention, n transformers (7) are arranged comprising one primary (8) and m three-phase secondary windings (9). Note here that, n≥2, and m≥3. Note also that p sets (10) of secondary windings are also provided for, each set being formed by m/p three-phase secondary windings (9) of every transformer (7). Every set (10) of secondaries (9) is connected to rectifier (2) of one converting subcircuit (1).

EFFECT: least number of higher harmonics relative to fluctuation of basic voltage and current harmonic connected to AC mains converting circuit input.

15 cl, 10 dwg

FIELD: electrical engineering; off-line power supply systems.

SUBSTANCE: proposed frequency converter that can be used for regulating frequency and voltage of power generators whose drive speed is unsteady has three-phase bridge circuit of uncontrolled rectifier 1, inverter 2 incorporating first and second transistors 3 and 4, respectively, and inverter capacitor 5, inverter control system 6, revolving-field transformer 7 incorporating first and second primary windings 8 and 9, respectively, phase-shifting capacitor 10, and secondary windings 11, 12, and 13, Drawing illustrates leads A1, B1, and C1 for connecting voltage supply at frequencyf1, and leads A2, B2, and C2 for connecting load at voltage frequency f2.

EFFECT: enhanced operating reliability of three-phase frequency converter.

1 cl, 1 dwg

FIELD: matching of motor-generator power.

SUBSTANCE: the system (100) has: a rectifier (110), electric-coupled to the porthole (120) of the motor-generator; and an inverter (130), electric-coupled to the rectifier (110) and to the load porthole (140). In the starting regime the combination rectifier (110) and the inverter (130) supply the starting power to the porthole (120) of the motor-generator. In the operating condition the combination rectifier (110) the inverter (130) supply the generated power to the load porthole (140) and generate the neutral output power (150).

EFFECT: simplified system and enhanced power of it.

10 cl, 5 dwg

FIELD: physics.

SUBSTANCE: multiphase converting circuit p≥3 phases (R, S, T) is proposed incorporating a converting subcircuit (1) intended for every aforesaid phase. Every said subcircuit (1) comprises rectifier (2), constant voltage circuit (3) connected to rectifying unit (2) and inverter unit (4) connected to aforesaid circuit (3). The first variable-voltage output (5) of everyone inverter unit (4) forms a phase output (6), while the second variable-voltage outputs (12) of units (4) are star-connected. In compliance with this invention, n transformers (7) are arranged comprising one primary (8) and m three-phase secondary windings (9). Note here that, n≥2, and m≥3. Note also that p sets (10) of secondary windings are also provided for, each set being formed by m/p three-phase secondary windings (9) of every transformer (7). Every set (10) of secondaries (9) is connected to rectifier (2) of one converting subcircuit (1).

EFFECT: least number of higher harmonics relative to fluctuation of basic voltage and current harmonic connected to AC mains converting circuit input.

15 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: invention refers to the sphere of electrical engineering and is highly relevant for design of power supply devices for discharge-impulse electrotechnological installations. Constant frequency stabilisation of voltage in a non-linear resonance circuit implemented within the parametric transformer secondary circuit with the circuit Q-factor QH=(ω0CR>2/m where ω0 =1/(L20C) is the resonance circuit frequency; L20, - the average paratrans output winding inductance; R - the discharge chamber resistance, m=0..1 - the paratrans inductance modulation depth factor. The proposed device for voltage stabilisation and discharge-impulse installation protection comprises a rectifier, a filter, a voltage inverter, a transformer and a discharge chamber. The inverter is of the resonance type with back-to-back diodes. The transformer is of the parametric type consisting of two butted orthogonal magnetic conductors with 2-6% of the winding wrapped around the butt joint enclosing the both magnetic conductors.

EFFECT: electrotechnological process enhancement in terms of quality and performance characteristics due to stabilisation of constant frequency supply voltage and improved operational reliability of the discharge-impulse installation due to efficient protection against overvoltage and short-circuiting.

2 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: power cell is controlled, and it is taken out of operation by means of bypassing in case of failure, switched off at input and output, tested and is brought into operation at positive testing result. Control is performed as to temperature of thyristors, output voltage of rectifier, temperature of IGBT-transistors and output current of inverter. During the test there checked is condition of input fuses an if their activations fail, thyristors are activated in pairs and output voltage of rectifier is checked, and then IGBT-transistors are activated in pairs and output current of inverter is checked through ballast load.

EFFECT: improving converter reliability.

2 dwg

FIELD: physics.

SUBSTANCE: in the method of controlling a frequency converter comprising a power supply filter, a single-phase rectifier, a clamp, a single-phase inverter on controlled rectifier diodes, a switching capacitor and switching inductor, which form a series resonant circuit with the load, control pulses are generated and successively transmitted to the rectifier diodes of the inverter, which form direct and inverse half-waves of alternating current in the load and they are switched on with frequency higher than the resonance frequency of the series resonant circuit. Instantaneous voltage across the output of the rectifier is measured. Frequency of switching on the rectifier diodes is controlled, respectively reduced and increased directly proportional to the measured instantaneous voltage across the output of the rectifier.

EFFECT: reduced current pulsation in the load of the frequency converter caused by pulsation of the output voltage of the single-phase rectifier.

2 dwg

FIELD: electricity.

SUBSTANCE: in a single-phase voltage inverter, according to the first version, a pulse generator is made with two antiphased outputs, every of which is connected to inputs of pulse generators in the appropriate channel. Each channel comprises generators of pulses of different duration τ1 and τ2, and antiparallel diodes are connected to transistors joined to generators of pulses with duration τ1 in each channel. According to the second version the antiparallel diodes are connected to transistors joined with generators of pulses with duration τ2 in each channel. According to the third version the control system includes a control element, the output of which is connected to additionally introduced inputs of generators of pulses with duration τ2 in each channel, the pulse generator is made with two antiphased outputs, every of which is connected to inputs of generators of pulses of the appropriate channel, and the antiparallel diodes are connected to transistors connected to generators of pulses with duration τ1 in each channel. According to the fourth version the antiparallel diodes are connected to transistors joined with generators of pulses with duration τ2 in each channel. The value of interval time between the trailing edge of the pulse with duration τ2 in one channel and the leading edge of the pulse τ1 in the other channel exceeds the time of load current drop down to zero in all versions of the single-phased voltage inverter.

EFFECT: simplified control system and increased operational reliability of the device.

4 cl, 6 dwg

FIELD: physics.

SUBSTANCE: frequency-pulse duration alternating voltage controller has an adder, an integrator, a relay element, comparators, dynamic D flip-flops, switch elements (thyristors), load resistors connected in a star circuit with a neutral terminal, a setting signal source and a three-phase voltage source. Said alternating current controller includes three dynamic D flip-flops, which enable to generate 'packets' of sinusoidal voltage across the load with a whole number of periods of mains voltage.

EFFECT: high energy efficiency.

5 dwg

FIELD: electricity.

SUBSTANCE: device comprises a control system, a stand-alone voltage inverter, a braking circuit, a storage capacitor and a three-phase active converter consisting of an output three-phase choke coil and a rectifier based on semiconductor elements; in the rectifier scheme there are also changes related to its rectifying part based on thyristors and there are changes in its inverting part based on diodes coupled in series and accordantly with transistors. The positive effect of the invention consists in the operation of the reversible electricity converter due to the introduced elements with voltage in a DC-link below the voltage level of a non-controlled rectifier, and as a consequence in the expansion of its functionalities and improved efficiency and operational reliability.

EFFECT: expansion functionalities of the reversible voltage converter an minimisation of the number of elements in the electric circuit, improved operational reliability of the device; the device has a sufficient degree of universality and may be used to develop electric frequency converters within the wide range of power for both low-voltage and high-voltage applications.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering and can be used for control of frequency transducer in a motor system. In the method of control of rotation electrical machine for minimizing losses related to switching in the rotation electrical machine, the iterative control method is offered which in advance calculates optimum switching states.

EFFECT: decrease of switching losses.

21 cl, 14 dwg

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