Push-pull soft switching control circuit

Abstract

The invention discloses a push-pull soft switching control circuit. The circuit comprises a push-pull control unit, a power MOS transistor driving unit, a push-pull boost power unit, an LC resonance unit, and an auxiliary power supply unit, the push-pull boost power unit comprises a tenth MOS transistor, an eleventh MOS transistor, a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor and a push-pull transformer, a drain electrode of the tenth MOS transistor and a drain electrode of the eleventh MOS transistor are both connected with one terminal of a primary coil of the push-pull transformer, a grid electrode of the tenth MOS transistor and a grid electrode of the eleventh MOs transistor are both connected with an output terminal of the power MOS transistor driving unit, a drain electrode of the twelfth MOS transistor and a drain electrode of the fourteenth MOS transistor are both connected with the other terminal of the primary coil of the push-pull transformer, and the LC resonance unit comprises a leakage inductor and a polypropylene capacitor. According to the circuit, the size of the power transformer can be reduced, the turn-on loss of a switching tube can be reduced, the loss of an inverter is reduced, the overall efficiency is improved, and the problem of EMI caused by hardware switching can be solved.

Description

technical field [0001] The invention relates to the field of inverter control, in particular to a push-pull soft switch control circuit. Background technique [0002] The development of power electronics technology puts forward the miniaturization and light weight requirements for power electronics products, and also puts forward higher requirements for efficiency and electromagnetic compatibility. In power electronic devices, filter inductors, capacitors and transformers account for a large proportion of volume and weight, and taking effective measures to reduce the volume and weight of these components is the main way to miniaturize and reduce weight. Increasing the switching frequency can correspondingly increase the cut-off frequency of the filter, so that smaller inductors and capacitors can be selected to reduce the volume and weight of the filter. Increasing the switching frequency can also reduce the size and weight of the transformer. However, while improving the ...

AI Technical Summary

Problems solved by technology

However, while improving the switching efficiency, the switching loss will increase, the problems of inductive turn-off, capacitive turn-on, and diode reverse recovery will be aggravated, the circuit efficiency will decrease, and the electromagnetic interference will increase.

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