Overvoltage protection circuit

Details Overvoltage protection circuit Overvoltage protection circuit

1993-09-30

1996-01-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361104, 361110, H02H 320

Patent

active

054834066

ABSTRACT:
An overvoltage protection circuit (11) for decoupling circuitry (12) from a voltage applied to an input (38). The overvoltage protection circuit (11) is integrated on an integrated circuit along with the circuitry (12). The overvoltage protection circuit (11) comprises a sense circuit (13), a timing circuit (14), a decoupling circuit (16), and a circuit (17). The sense circuit (13) detects when the voltage applied to the input (38) exceeds a threshold voltage. The timing circuit (14) is responsive to the sense circuit (13) and determines when the voltage exceeds the threshold voltage for a predetermined time. The decoupling circuit (16) is responsive to the timing circuit (14) and decouples the circuitry from the voltage applied to the input (38). The circuit (17) generates a logic signal indicating the circuitry has been decoupled.

REFERENCES:
patent: 4573099 (1986-02-01), Ganesan et al.
patent: 4879625 (1989-11-01), Potenzone
patent: 5164874 (1992-11-01), Okano et al.

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