Importance

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Abstract

Disclosed herein is a battery powered computer system which comprises a switch circuit and a battery charging circuit. In the switch circuit, a field-effect transistor (FET) is provided which is connected in parallel with a diode for preventing a current back flow from a battery to an alternating current (AC) adaptor. When the alternating current adaptor is supplying power, the field-effect transistor is turned on so that most of a current from the alternating current adaptor is delivered to a power supply line through the transistor instead of the diode. Similarly, in the battery charging circuit, a field-effect transistor is implemented which is connected in parallel with a diode for preventing a current back flow from the battery to the alternating current adaptor. When the battery is charged, the field-effect transistor is turned on so that most of a charging current is transferred to the battery through the transistor instead of the diode. According to the above-described arrangement of the switch and battery charging circuits, because the current from the alternating current adaptor passes through the respective transistors of the circuits, power dissipation and loss by the switch and battery charging circuits can be reduced, and no heat is generated by the diodes.

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First Claim