Pulse width modulated switching power supply
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United States of America Patent
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Jul 18, 1989
Grant Date -
N/A
app pub date -
Nov 3, 1988
filing date -
Nov 3, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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