UPS with input commutation between AC and DC sources of power

Details UPS with input commutation between AC and DC sources of power UPS with input commutation between AC and DC sources of power

1991-11-07

1993-08-31

Sterrett, J. L.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 75, 363 34, 363 37, 363142, H02J 900

Patent

active

052412172

ABSTRACT:
An uninterruptible power supply is disclosed which is cheaper and more adaptable to various utility service inputs than presently available power supplies. A storage capacitor is placed between a boost AC/DC converter at the input and a DC/AC inverter at the output. A storage battery for maintaining constant voltage should the utility service power be interrupted is placed at the input, before the boost converter. Thus, a small battery is required because the boost converter is capable of boosting the battery's voltage to the voltage contained on the storage capacitor. A bidirectional semiconductor switch is provided in the boost converter to allow current to flow in both directions between its switch terminals when a AC input is applied. Appropriate control circuitry is provided which monitors the voltage at specific points throughout the circuit and controls operation of the bidirectional switch. Additionally, the control circuitry controls operation of a relay to switch power input between the utility service input and the storage battery depending in part upon the state of the utility service input voltage.

REFERENCES:
patent: 3323005 (1967-05-01), Ladoniczki et al.
patent: 4185315 (1980-01-01), Miller
patent: 4253139 (1981-02-01), Weiss
patent: 4277692 (1981-07-01), Small
patent: 4409647 (1983-10-01), Terkanian
patent: 4779007 (1988-10-01), Schlanger et al.
patent: 4827150 (1989-05-01), Reynal
patent: 4935861 (1990-06-01), Johnson et al.
patent: 5017800 (1991-05-01), Divan

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