Uninterruptible power supply

Details Uninterruptible power supply Uninterruptible power supply

1985-02-12

1987-01-06

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

One source floats across or compensates for other source

307 64, 307 66, H02J 332

Patent

active

046348883

ABSTRACT:
A method and apparatus for supplying continuous output power from at least one of two sources of input power. A rectifier circuit rectifies an AC current from an AC power source into a DC current. A first sensing circuit respectively provides first and second control signals in response to the input voltage provided by the AC power source. The first control signal is provided when the AC power source voltage is within a predetermined voltage range. The second control signal is provided when the AC power source voltage is outside the predetermined voltage range so as to inhibit the rectification of the AC current. An inverter circuit converts a DC current from a DC power source into an AC current which is then rectified into a DC current. A second sensing current, responsive to the first and second control signals, generates a third control signal which controls the magnitude of the output of the inverter circuit. A demodulator circuit converts the DC currents from the rectifier circuit and the inverter circuit into a continuous output AC current.

REFERENCES:
patent: 4277692 (1981-07-01), Small
patent: 4488057 (1984-12-01), Clarke

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