System and method for protection against loss of battery in...

Details System and method for protection against loss of battery in... System and method for protection against loss of battery in...

2008-11-11

2011-10-18

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

Reexamination Certificate

active

08040647

ABSTRACT:
A system and method for protecting a reverse battery protected device during loss of battery are disclosed. An embodiment method includes biasing a substrate of a substrate switch of the reverse battery protected device to a lowest potential selected between a battery voltage and ground when the battery voltage is less than a magnitude of a first substrate clamping voltage during reverse battery, clamping the substrate to the first substrate clamping voltage when the battery voltage is greater than the magnitude of the first substrate clamping voltage during reverse battery, and clamping the substrate to a second substrate clamping voltage during loss of battery, where a magnitude of the second substrate clamping voltage is less than the magnitude of the first substrate clamping voltage.

REFERENCES:
patent: 4303958 (1981-12-01), Allgood
patent: 5608259 (1997-03-01), DeShazo et al.
patent: 6107844 (2000-08-01), Berg et al.

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