Battery monitor circuit and method for battery tamper detection

Details Battery monitor circuit and method for battery tamper detection Battery monitor circuit and method for battery tamper detection

2007-05-03

2010-11-09

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C320S134000, C320S165000, C324S426000, C324S430000, C324S433000

Reexamination Certificate

active

07830124

ABSTRACT:
A battery monitor circuit. The circuit includes a control module, a resistive load having a resistive value between a first and a second terminals and a part of that resistive value between the first and an intermediate terminals, a switch configured to couple the full load between circuit input and a common potential in response a pulse signal, a first comparator having inputs separately coupled to a voltage reference and the intermediate terminal, a second comparator having inputs separately coupled to the voltage reference and an input potential, a latch, a detection module having input coupled to second comparator output, and an alarm module. The latch is configured to latch a value at output of first comparator to another input of the detection module in response to the pulse signal; if input potential is less than a preselected magnitude, detection module output is configured to activate the alarm module.

REFERENCES:
patent: 4080560 (1978-03-01), Abert
patent: 6088207 (2000-07-01), Sugiura et al.
patent: 2006/0217873 (2006-09-01), Phillips et al.
patent: 2006/0267557 (2006-11-01), Nakano et al.

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