| 摘要 |
<P>PROBLEM TO BE SOLVED: To select a proper power supply source, and continuously supply power. <P>SOLUTION: A control circuit 35 is provided with a power combining circuit 41 for generating combined power Vor as third power created by combining first power supplied from a regulator 33 and second power supplied from a regulator 34 i.e. battery power Vbt and bus power Vbus. Circuits 42-47 for composing the control circuit 35 are operated by the combined power Vor. The control circuit 35 can be operated even if one of the first and second power is interrupted, controls first and second switch elements SW1, SW2, selects the proper power supply source (battery 31, PC 13) corresponding to power timely supplied, and continuously supplies power. <P>COPYRIGHT: (C)2007,JPO&INPIT |
