Patent ID: 6452362
Filing Date: 2002-09-17
Classification: H02J,Y02B

Abstract:
An electronic device, comprising:a main circuit power input terminal for supplying power to a main circuit of the electronic device from any of a first battery and a second battery; a battery control circuit, said battery control circuit responsive to an output voltage of said first battery, when said first battery is connected to said electronic device, and responsive to an output voltage of said second battery, when said second battery is connected to said electronic device, for generating a corresponding battery selection control signal dependent upon an output voltage level of said first battery and an output voltage level of said second battery; and a battery selection circuit, said battery selection circuit for electrically connecting one of said first battery and said second battery that has a relatively higher output voltage level than the other of said first battery and said second battery to said main circuit power input terminal in response to the corresponding battery selection control signal when both of said first battery and said second battery are connected to the electronic device.