INVERTER DRIVE SYSTEM WITH ULTRA-LOW SWITCHING POWER CONSUMPTION AND ULTRA-LOW OUTPUT END ELECTROMAGNETIC INTERFERENCE

摘要

An inverter drive system with ultra-low switching power consumption and ultra-low output end electromagnetic interference. The system comprises multiple phases of inverter drive systems, and each phase of inverter drive system is an independent system and comprises the following parts: a feedback control unit, a comparison control unit and a power switching circuit. By means of the combination of a power switching device and an inductance-capacitance output circuit, the power switching circuit operates in a state similar to a boundary conduction mode (BCM), and an inductive current increases from a reverse switching current to a peak current and then reduces to the reverse switching current in each high-frequency switching period while a low-frequency sinusoidal voltage and current output is maintained at an output end. A sinusoidal voltage circuit output with a low higher-order harmonic component is provided in principle; in addition, since the average value of the inductive current of an inductor at the beginning of each switching period is opposite to the average value of the inductive current of the inductor at the end of the switching period, ZVS switching of the power switching device can be realized by means of this current, thereby realizing low switching loss and low output end high-frequency electromagnetic interference.