Protection circuit section for semiconductor circuit system

Details Protection circuit section for semiconductor circuit system Protection circuit section for semiconductor circuit system

2006-09-12

2006-09-12

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

Reexamination Certificate

active

07106562

ABSTRACT:
A semiconductor circuit system has first, second, and third external terminals electrically separated from each other. The first external terminal is configured to receive a first power supply voltage in a normal operation. A protection circuit section is provided in the circuit system and includes a rectifier to allow a surge current to pass therethrough. The rectifier has a current passage connected between a specific terminal connected to a protection target and the third external terminal. The protection circuit section further includes a first PMOS transistor configured to trigger the rectifier, based on a surge voltage inputted into the second external terminal. The first PMOS transistor has a current passage connected between the second external terminal and a base of the NPN transistor. The first PMOS transistor has a gate connected to the first external terminal.

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