Capacitive backup power source for electromechanical actuator

Details Capacitive backup power source for electromechanical actuator Capacitive backup power source for electromechanical actuator

1994-09-30

1998-04-28

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307 65, 307108, 307109, 361156, 361160, 361170, 361152, H02J 700

Patent

active

057448760

ABSTRACT:
The present invention disclosed and claimed herein comprises a backup power system to supply current to an electromechanical actuator (50) to position a mechanical device (52) to a fail-safe position upon failure of a primary electric power source (12). A capacitor (40) is provided for storing energy. The capacitor (40) is charged by the primary electric power source (12). A relay device (35) is also provided for disconnecting the primary control signal upon failure of the primary electric power source (12) and connecting the capacitor (40) to the electromechanical actuator (50) to supply electric current to the electromechanical actuator (50) to position the mechanical device (52) to a fail-safe position. The relay device (35) comprises a transistor (32) which is kept turned off by the primary electric power source (12) and upon failure of the primary electric power source (12), turns on and energizes an electric relay coil (34). A timing capacitor (28) is provided to provide power and keep the transistor (32) off during brief power interruptions of the primary electric power source (12). A secondary backup capacitor (22) is provided to keep the transistor turned on for a given period of time when the electric power source fails. A limit switch (48) is also provided which is engaged when the mechanical device (52) reaches a fail-safe position and disconnects power to the electromechanical actuator (50).

REFERENCES:
patent: 2807009 (1957-09-01), Rowell
patent: 4186420 (1980-01-01), Van Hise
patent: 4352138 (1982-09-01), Giker
patent: 4496168 (1985-01-01), D'Antonio et al.
patent: 4558391 (1985-12-01), Ward et al.
patent: 5012121 (1991-04-01), Hammond et al.

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