Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1994-03-14
1996-10-08
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 363 98, H02M 3335
Patent
active
055637760
ABSTRACT:
An inverter/converter power supply system that employs pulse-width modulation controlled by an absolute-value representation of a reference wave. A low-frequency wave, such as a 60 hertz sine wave, is precision-rectified which then is the reference input of a pulse-width modulation controller (PWM). The PWM then produces a high-frequency square-wave signal whose pulse width changes as the amplitude of the rectified reference wave changes. The high-frequency square-wave signal is further rectified at an inverter/converter transformer secondary, whose output is filtered through a low-pass filter that removes the high-frequency component while minimizing the stored charge in the filter capacitor(s) to an amount easily drained by a small constant-current load across it. Feedback from the constant-current load to the PWM further adjusts the pulse-width to compensate for load variations and circuit losses. A flip-flop matrix of transistors then converts the pulsating DC wave signal to an AC wave signal by inverting the polarity on every other half wave cycle.
REFERENCES:
patent: 4502106 (1985-02-01), Glennon
patent: 4580064 (1986-04-01), Varnovitsky
patent: 4641232 (1987-02-01), Pitel
patent: 4779007 (1988-10-01), Schlanger et al.
patent: 4939633 (1990-07-01), Rhodes et al.
patent: 5070251 (1991-12-01), Rhodes et al.
patent: 5155671 (1992-10-01), Inaba et al.
Ecktronics Corp.
Han Y. J.
Wong Peter S.
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