Thermal Cutoff Circuit
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United States of America Patent
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Issued Date -
Nov 22, 2012
app pub date -
May 20, 2011
filing date -
May 20, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A thermal cutoff circuit for an electronic device including a power unit, a thermal sensor, a logic unit, and a power switch unit is provided. The power unit includes a power switch for powering up the thermal cutoff circuit with a supply voltage in response to a user event. The thermal sensor provides an active thermal sense signal and an inactive thermal sense signal when a temperature of the electronic device exceeds a threshold and does not exceed the threshold, respectively. The logic unit provides an inactive cutoff signal and provides an active cutoff signal respectively according to the inactive thermal sense signal and the active thermal sense signal. The power switch unit powers the electronic device up according to the inactive cutoff signal and stops powering up the electronic device according to the active thermal sense signal.
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