PWM rectifier control with switching losses equally distributed

Details PWM rectifier control with switching losses equally distributed PWM rectifier control with switching losses equally distributed

1997-04-21

2000-06-13

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 363 69, 363128, 322285, H02M 542

Patent

active

060757175

ABSTRACT:
Switching losses are distributed equally between multiple switching devices in a rectifier bridge (50) in which the rectifier bridge comprises at least a first pair of serially connected switching devices (56A, 56B) connected between positive and negative DC output buses (52, 54) and a second pair of serially connected switching devices (58A, 58B) connected in parallel with the first pair of switching devices. Only one of the switching devices in each pair of switching devices is pulse width modulated at any time at a frequency substantially higher than a frequency of the AC power applied to the rectifier bridge while another of the switching devices in each pair of switching devices is operated in synchronism with the waveform of the AC power applied to the bridge. Operation further involves periodically alternating the PWM operation of the switching devices between switching devices in each pair of switching devices so as to distribute the losses. Preferably, the process of alternating between PWM modulated switching devices occurs at zero crossings of the AC waveform so as to minimize transience generated in the switching process.

REFERENCES:
patent: 4435750 (1984-05-01), Schutten et al.
patent: 5034874 (1991-07-01), Araki
patent: 5373223 (1994-12-01), Akagi et al.
patent: 5483140 (1996-01-01), Hess et al.
patent: 5491624 (1996-02-01), Levran et al.
patent: 5801517 (1998-09-01), Borle

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