Electric power conversion systems – Current conversion – With starting arrangement
Patent
1989-06-30
1990-07-10
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With starting arrangement
363 56, 363 98, H02M 75375
Patent
active
049410768
ABSTRACT:
A four-quadrant buck converter is described having a common leg of an inductor in series with an output capacitor, one power supply for providing a positive voltage output signal and negative voltage output signal to two solid-state switches joined at a common node, an output transformer whose primary is connected across the output capacitor and a pulse width modulator control circuit for operating the switches to produce a predetermined voltage across said output capacitor and for regulating the current out of the transformer. The control circuitry operates in response to a voltage signal from the output of the power supply, a voltage representative of the voltage at the output of the converter, a high frequency ramp voltage, an internal oscillator voltage, a voltage representative of the RMS current flowing on the secondary side of the output transformer, an under-voltage lockout voltage, and a start-up voltage for slowly starting the converter and protecting against overshoot.
REFERENCES:
patent: 4347558 (1982-08-01), Kalinsky
patent: 4714978 (1987-12-01), Coleman
patent: 4821163 (1989-04-01), Bloom
Beha Jr. William H.
Zenith Electronics Corporation
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