Title :
A novel soft-switched PWM inverter for AC motor drives
Author :
Chen, Shaotang ; Lipo, Thomas A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
fDate :
7/1/1996 12:00:00 AM
Abstract :
A novel soft-switched inverter topology is derived from the passively clamped quasi-resonant link (PCQRL) circuit. By introducing magnetic coupling between the two resonant inductors, the number of auxiliary switches can be reduced from two to one, and only a single magnetic core is required for the resonant DC link. An analysis of this novel PCQRL topology with coupled inductors is presented to reveal the various soft-switching characteristics. In comparison with the conventional passively clamped, continuously resonant DC link inverter, this soft-switched inverter can reduce voltage stresses from more than 2 per unit (pu) to 1.1-1.3 pu. It can also provide soft-switched pulse-width modulated (PWM) operation. Simulations and experiments are performed to backup the analysis
Keywords :
AC motor drives; DC-AC power convertors; PWM invertors; power semiconductor switches; resonant power convertors; switching circuits; AC motor drive; applications; auxiliary switch; magnetic core; magnetic coupling; passively clamped quasi-resonant link circuit; resonant DC link; resonant inductors; soft-switched PWM inverter; soft-switching characteristics; topology; voltage stresses; AC motors; Circuit topology; Coupling circuits; Inductors; Magnetic resonance; Magnetic switching; Pulse width modulation; Pulse width modulation inverters; Resonant inverters; Switches;
Journal_Title :
Power Electronics, IEEE Transactions on
