| 摘要 |
PROBLEM TO BE SOLVED: To avoid a failure of a circuit even if a common ground line is open- circuited and a high voltage is applied to the common ground line by a short circuit, etc. SOLUTION: A load circuit 21 (including various types of actuators and their drive circuits) is connected to a power supply line with a battery voltage VB and the load circuit 21 is connected to a ground line GND2. A plurality of circuits 22 and 23 are connected to a power supply line with a DC power supply voltage Vcc of 5 V and one circuit 23 is connected to the ground line GND2 common with the load circuit 21 and the other circuit 22 is connected to a ground line GND1 different from the common ground line GND2. A protective diode 24 is connected in a forward direction between the circuit 23 connected to the common ground line GND2 and the power supply line with the DC power supply voltage Vcc which supplies a power to the circuit 23. |
