Pulse width modulated switching power supply

Details Pulse width modulated switching power supply Pulse width modulated switching power supply

1988-11-03

1989-07-18

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 80, 363 97, 363131, 323267, H02M 3335

Patent

active

048498688

ABSTRACT:
An improved regulator circuit for a pulse width modulated power supply having an input switch and a plurality of different output voltages. A precision reference voltage is connected to one or more op-amplifiers and/or divider networks, each of which is connected to an output voltage for translating the outputs to ground when the voltages are properly regulated. A differential amplifier is connected to each of the operational amplifiers and divider networks. When the absolute value of any voltages goes low, the corresponding input to the differential amplifier rises and diverts drive current from an optoisolator for increasing the duty cycle of the input switch.

REFERENCES:
patent: 4230981 (1980-10-01), Rambold
patent: 4419723 (1983-12-01), Wilson, Jr.
patent: 4510564 (1985-04-01), Seer, Jr.
patent: 4538219 (1985-08-01), Morris et al.
patent: 4652987 (1987-03-01), Matthews et al.
patent: 4745538 (1988-05-01), Cross et al.

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