Battery reversal protection

Details Battery reversal protection Battery reversal protection

1981-11-13

1983-12-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Reverse phase responsive

361 58, 361 88, 307127, 307262, 320 25, 320 26, H02H 900

Patent

active

044234562

ABSTRACT:
A semiconductor circuit for protecting battery powered electronic devices from damage due to polarity reversal. A metal oxide semiconductor is employed in series with the power source to switch the power input as appropriate. A first embodiment simply disables the power source input upon improper polarity. A second embodiment actually reverses the effective polarity to the load. Because the source-to-drain impedance of the metal oxide semiconductor device is resistive, a number of protection devices may be used in parallel to achieve an arbitrarily low voltage drop between power source and load for a given current drain.

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patent: 3571608 (1971-03-01), Hurd
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patent: 3819951 (1974-06-01), Moore
patent: 3819951 (1974-06-01), Moore
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patent: 3839679 (1974-10-01), Hughes
patent: 3944891 (1976-03-01), McDonald et al.
patent: 4086624 (1978-04-01), Fraley
patent: 4171512 (1979-10-01), Tsuda

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