Control circuit for tap-switching power supplies and multi-tap t

Details Control circuit for tap-switching power supplies and multi-tap t Control circuit for tap-switching power supplies and multi-tap t

1986-08-21

1988-03-22

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

323343, 363 89, G05F 116

Patent

active

047331585

ABSTRACT:
A tap-switching circuit for automatically controlling the output voltage of a multi-tap transformer in response to a varying input line voltage and/or system load current demand, includes voltage sensing circuitry in parallel with both the transformer voltage outputs and a voltage comparator for sensing changes in the system load demand requirements. A voltage reference is provided for automatically generating a pre-selected voltage reference level signal for the line and/or system load requirements. Voltage comparison circuitry is operatively connected with the voltage sensing circuitry for generating an enable signal whenever the input line voltage and/or system load current demand requirements sensed by the voltage sensing circuitry falls below the pre-selected voltage reference level signal. A switching circuit is operatively connected to the voltage comparison circuitry, a linear regulator and to at least two taps of the multi-tap transformer for connecting the higher voltage tap to supply a pre-regulator voltage to the linear regulator whenever the enable signal is present, and for disconnecting the higher voltage tap from supplying its pre-regulator output voltage whenever the enable signal is absent.

REFERENCES:
patent: 3319153 (1967-05-01), Livingston
patent: 3743921 (1973-07-01), Legg et al.
patent: 4454466 (1984-06-01), Ritter
Barshay et al., "Bifunctional Single-Channel Circuit", IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972, pp. 2546-2547.

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