| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power circuit that is simplified, can easily be manufactured and is used for an apparatus having a monitoring function of a voltage state of a battery. <P>SOLUTION: The power circuit is provided with: the battery 65; a battery voltage detection circuit 67 for detecting a battery voltage of the battery in a state of being isolated from an output of the battery; and a control voltage generation circuit 68 for converting the output of the battery into a desired DC voltage used for a control power supply. The battery voltage detection circuit 67 and the control voltage generation circuit 68 comprise a DC-DC converter circuit provided with a transformer having a primary winding 67a and first and second secondary windings 67c, 68a, wherein the primary winding and the battery are connected, the battery voltage detection circuit 67 uses the first secondary winding, and the control voltage generation circuit 68 uses the second secondary winding, and the power supply circuit is applied to the apparatus having a function of transmitting a battery voltage detection signal outputted from the battery voltage detection circuit 67 as a monitoring result of the voltage state of the battery. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
