Backup protection switch to prevent reverse power flow in a UPS

Details Backup protection switch to prevent reverse power flow in a UPS Backup protection switch to prevent reverse power flow in a UPS

1987-09-21

1988-08-09

Beha, Jr., William H.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 46, 307 86, 361 84, H02J 904

Patent

active

047630140

ABSTRACT:
A UPS system includes a mechanical backup input line isolation switch to provide mechanical isolation between the primary energy source connected to the input line and the secondary energy source upon detection of a failure of an electronic isolation switch normally providing isolation between the input line and the secondary energy source. Detection of such a failure is accomplished by means of a dummy load which is connected in across the input line. Its impedance is sized to permit a small low level of current flow, above normal leakage current levels permitted by a functioning semiconductor electronic line switch, if energy is reverse coupled from the reserve energy source via a failed electronic line switch without draining significant power from the primary energy source when the UPS is normally operative and deriving power from the primary energy source. A power flow direction sensing circuit detects the direction of power flow at the input to which the primary energy source is connected to the UPS and a control circuit responsive to the power flow direction sensing circuit disconnects the input from the primary energy source if reverse power flow is detected by activating a mechanical switch to disconnect the input from the primary energy source.

REFERENCES:
patent: 3614461 (1971-10-01), Speer et al.
patent: 3971957 (1976-07-01), Hase
patent: 4400624 (1983-08-01), Ebert
patent: 4506766 (1985-03-01), Watanabe
patent: 4598330 (1986-07-01), Woodworth

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