| 摘要 |
PURPOSE: A protection circuit for a power source of an ECU driving unit of an air suspension is provided to prevent burning of the ECU driving unit by opening relay by comparing the voltage of a vehicle battery with that of the output of the relay. CONSTITUTION: A protection circuit for a power source of an ECU driving unit(40) of an air suspension comprises a voltage comparison unit(10) and a ground connecting unit(20). The relay(30) intermits power supplied to the ECU driving unit from a battery(60), and the voltage comparison unit compares the voltage of a vehicle battery with that of the output of the relay. The ground connecting unit connects the output of a MCU(Micro Control Unit)(50) to ground depending on the output of the voltage comparison unit and controls the relay. |
