Title :
A PWM inverter with DC busbar voltage modulation of capacitor discharge
Author_Institution :
Hangzhou Inst. of Commerce, China
Abstract :
A PWM (pulsewidth-modulated) inverter with DC busbar voltage modulation of the capacitor discharge is presented and analyzed. DC busbar voltage is periodically modulated to zero, which can arise the switching frequency of the power switches by about one order of magnitude. The inverter is well suited for fully controlled power switches. A PWM-controlled scheme for a variable-frequency three-phase induction-motor drive especially suitable for this inverter circuit is discussed. The scheme adopts linear adaptive delta modulation to produce the PWM sequence. With delta modulation it is easy to change from a PWM pulse sequence to a square sequence smoothly. Microcomputer software can be used to produce the PWM sequence in real time.<>
Keywords :
busbars; electric drives; induction motors; invertors; power capacitors; pulse width modulation; switching; DC busbar voltage modulation; PWM inverter; PWM-controlled scheme; capacitor discharge; linear adaptive delta modulation; microcomputer software; power switches; switching frequency; variable-frequency three-phase induction-motor drive; Capacitors; Circuits; Delta modulation; Drives; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Switching frequency; Zero voltage switching;
Conference_Titel :
Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE
Conference_Location :
Pittsburgh, PA, USA
DOI :
10.1109/IAS.1988.25150
