Title :
Inductor commutation soft-switched PWM inverter driven by frequency-modulated PWM signal
Author :
Nagao, Michihiko ; Harada, Koosuke
Author_Institution :
Energy Electron. Lab., Kumamoto Inst. of Technol., Japan
fDate :
1/1/1998 12:00:00 AM
Abstract :
This paper presents a novel technique using frequency modulation (FM) to improve the efficiency of an inductor commutation soft-switched pulse-width-modulation (PWM) inverter (ICSI). In the ICSI, a circulating current for soft switching always flows through the switches of the inverter, independent of the load and input signal. The circulating current significantly deteriorates the efficiency of ICSI. With the FM technique, the circulating current is effectively suppressed without sensing any current or voltage in the inverter. Efficiencies of ICSI and ICSI with FM (FM ICSI) are analyzed and verified experimentally. As a result, the efficiency of FM ICSI rises about 20%-40% compared with the ICSI
Keywords :
DC-AC power convertors; PWM invertors; commutation; frequency modulation; power inductors; switching circuits; ZCS; ZVS; circulating current suppression; frequency-modulated PWM signal; inductor commutation; power conversion efficiency; soft switching; soft-switched PWM inverter; Filters; Frequency modulation; Inductors; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Switched capacitor circuits; Switches; Zero current switching; Zero voltage switching;
Journal_Title :
Power Electronics, IEEE Transactions on
