用一对二级管以反向偏执于正常方向的形式连接至电源端，来保护过高的输入电压。
Protecting against excessive input voltages using a pair of diodes to power supply reversibly biased in normal direction.
电弧电压：一般认为电源正常输出电压即为切割电压。
Four, arc voltage: generally believe that the power supply is normal output voltage for cutting voltage.
因此，汽车电源系统的好坏直接影响汽车的正常运行，所以对于电源系统的检查及其故障维护是十分必要的。
Therefore, the quality of automotive power systems directly affect the normal operation of the car, so the power supply system for the inspection and maintenance of the fault is necessary.
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