THYRISTOR FREQUENCY CONVERTER Russian patent published in 2017 - IPC H02M5/45 

FIELD: electricity.

SUBSTANCE: thyristor frequency converter contains uncontrolled rectifier connected on the one hand to supply, on the other hand to the filter, which is connected to the terminals single-phase voltage inverter having two power thyristors, two switching thyristors, switching capacitor and two reverse diodes. The cathode of the first power thyristor is connected to the anode of the first free-wheeling diode, the cathode of which is connected to the positive terminal of the filter, the cathode of the second power thyristor is connected to the cathode of the second switching thyristor, the cathode of the second free-wheeling diode is connected to the anode of the second power thyristors, one terminal of the switching capacitor is connected to the anode of the second switching thyristor. The inverter voltage anodes of first and second power thyristors are connected to the positive terminal of the filter capacitor. The anode of the second free-wheeling diode is connected to the cathode of the second thyristor circuit. The cathode of the first thyristor circuit is connected to the cathode of the first switching thyristor, whose anode is connected to the cathode of the first clipping diode, the anode of which is connected to a negative terminal of the filter capacitor. By switching the anode of the second thyristor is connected the second clipping diode cathode, the anode of which is connected to a negative terminal of the filter capacitor. The transformer has two primary semi-windings, first and second in series and in accordance with forming the average output. The beginning of the first transformer semi-winding is connected to the cathode of the first thyristor and the first power switching thyristor, and the end of the second semi-winding is connected to the cathode of the second thyristor and the second power switching thyristor. By the middle pin of the transformer connected to the beginning of the primary winding of a three-winding choke, the end of the primary winding is connected to the negative terminal of the filter capacitor. Starting first additional inductor winding is connected to the anode of the switching diode of the charge capacitor whose cathode is connected to one terminal of a switching capacitor and to the anode of the first thyristor switching. The end of the first auxiliary winding of the three-layer winding inductor connected to the second terminal of the switching capacitor and the positive terminal of the filter capacitor. The start of the second auxiliary winding of the three-layer winding inductor is connected to one terminal of the capacitor and the electrical energy storage device to the negative terminal of the filter capacitor. The end of the second three-layer winding choke additional winding is connected to the anode of the diode electric charge energy storage capacitor, the cathode of which is connected to the second terminal of the capacitor and the electrical energy accumulator with the anode auxiliary thyristor, the cathode of which is connected to the secondary transformer conclusion.

EFFECT: lower throttle power ready for operation immediately after switching on, the galvanic isolation provided by the power circuit and the load.

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