Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1988-10-12
1989-10-03
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
330 10, 363 49, 363 56, 363 79, 363 98, 363132, H02M 7538
Patent
active
048721000
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 modulated 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, and a voltage representative of the RMS current flowing on the secondary side of the output transformer. The converter incorporates overcurrent protection, an under-voltage lockout, overshoot protection, a slow start-up, inexpensive RMS conversion and other useful functions and capabilities.
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Cuk & Erickson, "A Conceptually New High-Frequency Switched-Mode Power Amplifier Technique Eliminates Current Ripple", from Proceedings of Powercon 5, May 4-6, 1978, pp. 401-422.
Beha Jr. William H.
Zenith Electronics Corporation
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