Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1985-03-29
1987-06-09
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323285, 363 97, G05F 146
Patent
active
046723005
ABSTRACT:
A switched-mode power supply for producing a DC voltage output from a unidirectional-current or alternating-current input uses amplitude modulation of current through and inductor. Input terminals joined to the inductor receive the input. A switch in series connection with the inductor responds to a switching signal for controlling the inductor current. A capacitor and diode store energy received from the inductor. A computation circuit is joined to a switch control circuit for sensing the inductor current and producing a switching signal for opening the switch when the inductor current reaches a desired maximum. A reference voltage generator, which produces a signal indicative of the maximum inductor current, includes an adjustment circuit for modulating an error signal, derived from an integral of the difference between a desired output voltage and the actual output voltage, by the input voltage. Inductor current is thereby modulated in phase with input voltage. A quick response circuit is provided for controlling rapid fluctuations in the output voltage. An alternating current source is provided which includes a resonant oscillator for producing an alternating current having a substantially pure sine wave output. A thermally-activated safety switch is also provided for absorbing energy when high voltage surges appear on the input terminals of the power supply.
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patent: 4253055 (1981-02-01), Gatten
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patent: 4368420 (1983-01-01), Kuo
patent: 4392103 (1983-07-01), O'Sullivan et al.
patent: 4428015 (1984-01-01), Nesler
patent: 4471418 (1984-09-01), Tuma
patent: 4524305 (1985-06-01), Martin
Braydon Corporation
Jones Judson H.
Wong Peter S.
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