Control logic power down circuit

Details Control logic power down circuit Control logic power down circuit

1994-03-25

1995-05-30

Dougherty, Thomas M.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

307 64, G05F 140, H02J 700

Patent

active

054207835

ABSTRACT:
A secondary low voltage regulator for systems having low voltage control logic and high voltage devices susceptible to thermal damage due to loss of control logic power. When a power failure interrupts the primary power supply for the control logic, the secondary regulator uses the falling high voltage normally supplied to the high voltage devices as an input to a secondary regulator which supplies power to the control logic. The control logic remains active until the falling high voltage reaches a low level where the high voltage devices will not be heat damaged if not controlled by the control logic circuitry.

REFERENCES:
patent: 4492876 (1985-01-01), Colbert et al.
patent: 4698738 (1987-10-01), Miller et al.
patent: 5191229 (1993-03-01), Davis et al.
patent: 5216286 (1993-06-01), Peterson

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