Patent ID: 7646168
Filing Date: 2010-01-12
Classification: H02J

Abstract:
1. A electric device with adjustable voltage that is installed in an electronic system, the electric device comprising: a motherboard; a battery coupled with the motherboard; a charging circuit on the motherboard, the charging circuit arranged to couple with and charge the battery, and outputs a first signal when the battery is fully charged; a voltage control circuit coupled with the charging circuit, the voltage control circuit arranged to receive the first signal and generate a second signal; and an adapter coupled with the motherboard, the adapter arranged to supply power to the electronic system and battery, wherein when the adapter receives the second signal, the adapter outputs a second voltage to the electronic system only, and when the adapter does not receive the second signal, the adapter outputs a first voltage to the electronic system and the battery both, wherein the first voltage is larger than the second voltage and the second voltage is not zero voltage.