Patent ID: 8605403
Filing Date: 2013-12-10
Classification: H02H

Abstract:
1. A thermal protection circuit for an electronic device, comprising: a temperature sensor operable to sense an internal temperature of the electronic device and output an internal temperature signal with a voltage, wherein the voltage of the internal temperature signal is inversely proportional to the internal temperature; a hysteresis comparator to output a power-off signal when the voltage of the internal temperature signal is lower than a low voltage threshold representing a determined temperature, or output a power-on signal when the voltage of the internal temperature signal is higher than a high voltage threshold representing a restarting temperature of the electronic device; a switch circuit to stop transmitting power signals to the electronic device in response to the power-off signal, or continue to transmit the power signals to the electronic device in response to the power-on signal; wherein the hysteresis comparator comprises: