| 摘要 |
A control circuit for a vehicle for, e.g., chassis leveling or other purposes includes a controller selectively sending drive signals to a load through a switch FET, and a BJT having a collector connected between the switch FET, an emitter connected to ground, and a base connected to a current view resistor for short circuit protection. An over power protection FET is connected to the controller and to the base of the short circuit protection transistor, with the gate of the over power protection FET being connected to the output of the switch FET. A time delay capacitor is connected from the base of the BJT to ground. With this structure, if a ground fault causes the BJT to turn on, and if the drain-source voltage of the switch FET exceeds the gate threshold voltage of the overpower protection FET, the overpower protection FET is turned on, resulting in turning off the switch FET and, hence, avoidance of high power draw through the switch FET.
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