Patent ID: 6700766
Filing Date: 2004-03-02
Classification: H02H

Abstract:
An electronic device protection circuit for inhibiting a voltage exceeding a rated voltage of an electronic device from being applied to the electronic device, comprising:a current-increasing device that increases a current when the voltage applied to the current-increasing device is greater than the rated voltage; a current-inhibiting device that inhibits the current by increasing an electrical resistance in response to one of an increase in current and a rise in temperature, wherein the current-inhibiting device and the current-increasing device are connected in series and are connected in parallel with a battery on the protection circuit, and wherein the current-increasing device and the current-inhibiting device are arranged to conduct heat to each other, and applying an overvoltage greater than the rated voltage causes a current resulting from the overvoltage to flow through the current-increasing device, so that the current-increasing device generates heat, and the current resulting from the overvoltage is bypassed from the current-increasing device and the current-inhibiting device to reduce the current flow through the electronic device.