Regulated power supply and method

Patent 4994685 Issued on February 19, 1991. Estimated Expiration Date:

June 26, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Mathison, Leslie C.

Assignee

NCR Corporation

Application

No. 371564 filed on 06/26/1989

US Classes:

307/66, Storage battery or accumulator307/48, Storage battery or accumulator-type source323/249, Controllably saturable323/254, With electronic tube or a three or more terminal semiconductive device in control circuit323/273, Linearly acting323/281With reference voltage circuitry

Examiners

Primary: Pellinen, A. D.
Assistant: Osborn, David

Attorney, Agent or Firm

Hawk, Jr.; Wilbert, Jewett; Stephen F., Foote; Douglas S.

International Classes

H02J 009/06
G05F 001/46
G05F 001/56

Abstract

The subject invention is a power supply comprising a magnetic amplifier, filter, back-up battery, switch-over regulating circuit and error amplifier. The magnetic amplifier receives a plurality of AC pulses and controls the pulse width of the pulses. The filter converts the pulses to a DC output. The switch-over regulating circuit connects the battery to the DC output. The error amplifier monitors the DC output and provides, at its output, an error signal to the magnetic amplifier and the switch-over regulating circuit.