Reverse battery protection

Details Reverse battery protection Reverse battery protection

1979-06-18

1981-12-01

Larkins, William D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

307304, 357 42, H01L 2704

Patent

active

043039588

ABSTRACT:
There is provided a reverse battery protection circuit which does not have current limiting resistors to limit current in all portions of the circuit. The protection is obtained by connecting the substrate tubs of N-channel drivers through another N-channel transistor to VSS. The another N-channel transistor has its gate electrode connected to voltage terminal VDD. Accordingly, when reverse voltage is applied to the circuit, VDD will be negative and therefore the another N-channel transistor will not be conductive. This prevents the output driver transistor from becoming a conductive parasitic bipolar transistor.

REFERENCES:
patent: 3932884 (1976-01-01), Kitamura
patent: 3934399 (1976-01-01), Nishimura et al.
patent: 3936676 (1976-02-01), Fujita
patent: 4006491 (1977-02-01), Alaspa et al.
patent: 4039869 (1977-08-01), Goldman et al.
patent: 4191898 (1980-03-01), Ulmer
patent: 4209713 (1980-06-01), Satou et al.

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