Patent ID: 8471530

Claim:
A battery state monitoring circuit, comprising: a charge/discharge control circuit for detecting and controlling a state of a secondary battery; an automatic recovery circuit coupled to the charge/discharge control circuit and coupled to positive and negative terminals of the second battery; a temperature sensor circuit coupled to an output terminal of the automatic recovery circuit and to the charge/discharge control circuit, the temperature sensor circuit operable to control the charge/discharge control circuit; and a comparator having a positive input terminal coupled to the output terminal of the automatic recovery circuit, a negative input terminal coupled to the positive terminal of the second battery and an output terminal coupled to the temperature sensor circuit, the comparator operable to compare a voltage of the output terminal of the automatic recovery circuit and a voltage of the secondary battery, and output a signal indicative of a result of the comparison to the temperature sensor circuit, to control an operation of the temperature sensor circuit; wherein the temperature sensor circuit suspends and starts the operation in response to the signal from the comparator, thereby activating the temperature sensor circuit upon detection that a charger is connected.