Surge protection circuit

Details Surge protection circuit Surge protection circuit

2006-12-26

2006-12-26

Nguyen, Chau N. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

C361S118000

Reexamination Certificate

active

07154727

ABSTRACT:
Methods of protecting against a surge voltage and apparatus for performing the same. One embodiment of the invention is directed to a circuit to protect a device from a surge voltage. The circuit is connected between the device and first and second nodes to which the surge voltage may be applied. A charge storage device is connected between third and fourth nodes and the device is operatively connected to the third node and a fifth node. The circuit comprises a first overvoltage protection device coupled between the fourth node and a fifth node, the fourth and fifth nodes being operatively connected to the first and second nodes, respectively, and a second overvoltage protection device coupled between the third node and the fifth node. A voltage between the third and fifth nodes during the surge voltage is substantially less than a switching voltage of the second overvoltage protection device for at least a portion of the duration of the surge voltage.

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patent: 6385030 (2002-05-01), Beene
patent: 6842518 (2005-01-01), Chen et al.

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