| 摘要 |
Provided is a power supply protection circuit for an in-vehicle electronic device, for protecting a power supply of a circuit to be protected which is installed in the in-vehicle electronic device, including a battery power supply for the in-vehicle electronic device, a diode whose anode terminal is connected therewith, a transistor whose collector terminal is connected with a cathode terminal of the diode and whose emitter terminal is connected with a power supply voltage supplying terminal of the circuit to be protected, and a Zener diode provided between the battery power supply and a ground terminal to be connected in series with a resistor having an anode terminal connected with the ground terminal and a cathode terminal connected with the resistor and a base terminal of the transistor.
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