Power supply circuit and a voltage level adjusting circuit and m

Details Power supply circuit and a voltage level adjusting circuit and m Power supply circuit and a voltage level adjusting circuit and m

1999-04-29

2000-12-19

Ballato, Josie

Electrical transmission or interconnection systems

Plural supply circuits or sources

320118, H02J 110

Patent

active

061630861

ABSTRACT:
A power supply circuit for AC/DC adapter-powered or battery-powered portable electronic devices, which has a linear regulator, and includes a voltage level adjusting circuit coupled to the linear regulator. The voltage level adjusting circuit lowers a voltage supplied from the AC/DC adapter to a predetermined level. In an embodiment, the level-adjusted voltage equals a voltage supplied from the battery. The linear regulator is therefore always provided with a constant voltage regardless of the power sources.

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