Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1988-07-11
1989-03-21
Beha, Jr., William H.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323288, H02M 3158
Patent
active
048146846
ABSTRACT:
An apparatus is disclosed for extending the Vout/Vin ratio of a commercially available DC-to-DC converter. The DC-to-DC converter is connected to a first DC voltage, Vin. An inductor is connected to the first DC voltage and to a rectifier which provides the output voltage Vout. A first switching circuit is connected to the junction of the inductor and rectifier and to electrical ground. An oscillator provides a control signal for controlling actuation of the first switching circuit. The output signal from the oscillator has a duty cycle. A timing capacitor is connected to the oscillator and controls the duty cycle of the control signal output to the first switching circuit. A second switching circuit is connected to the output of the inductor/rectifier junction and is connected across the capacitor to provide a second discharge path for the capacitor in response to the first switching device disconnecting the junction of the inductor and rectifier from electrical ground. The second switching circuit rapidly discharges the timing capacitor and thereby extends the ON/(ON+OFF) time of the first switching device which, in turn, extends the Vout/Vin ratio of the converter beyond that specified by the manufacturer.
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patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4355277 (1982-10-01), Davis et al.
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patent: 4679131 (1987-07-01), Filliman
Motorola Information Note for MC 34063 from Motorola Linear Interface Integrated Circuits Catalog, Copyright 1983.
Motorola Application Note AN920A.
Beha Jr. William H.
TRW Inc.
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