Patent ID: 8913361
Filing Date: 2014-12-16
Classification: H02H

Abstract:
1. An overvoltage protection circuit, configured to protect a battery pack from overvoltage when the battery pack is in charge, comprising: a power supply configured to charge the battery pack; an overvoltage protection chip electronically connected between the power supply and the battery pack, the overvoltage protection chip comprising a voltage detection pin, the over voltage protection chip disconnecting the battery pack from the power supply when the voltage of the voltage detection pin is higher than a predetermined voltage; a controller electronically connected to the battery pack, the controller detecting whether the battery pack is a high voltage type battery pack or a normal voltage type battery, and outputting corresponding control signals according to the detection; a switching circuit comprising a switch and two voltage dividing circuits, the switch connecting a corresponding voltage dividing circuit to a positive pole of the battery pack and the voltage detection pin under control of the control signal; wherein when each of the voltage dividing circuits is connected between the positive pole of the battery pack and the voltage detection pin, the voltage dividing circuit outputs a divided voltage of the positive pole of the battery pack to the voltage detection pin.