| 摘要 |
<P>PROBLEM TO BE SOLVED: To protect a circuit from a high voltage erroneously applied between an electronic apparatus and a power supply circuit which are loaded in a vehicle. <P>SOLUTION: A power supply circuit 20 comprises a series regulator 22 and a microcomputer 21. The series regulator 22 generates a power source by converting a voltage value of input power input via an input terminal T1 into a predetermined output voltage value, and outputs the generated power source to a GPS antenna 24 via an output terminal T2. The microcomputer 21 detects a voltage value V<SB POS="POST">out</SB>at a detection point P1 by detecting a terminal voltage value V<SB POS="POST">3</SB>in AD3. Then, based on the detected voltage value V<SB POS="POST">out</SB>at the detection point P1, the microcomputer 21 controls operation of the series regulator 22. <P>COPYRIGHT: (C)2012,JPO&INPIT |
