| 摘要 |
A voltage protecting circuit includes a switch unit, an upper limited voltage detecting unit, a lower limited voltage detecting unit, and a logic control unit. When a voltage output from a voltage input interface is less than the lower limited voltage or greater than the upper limited voltage, the logic control unit outputs a control signal to turn the switch unit off. The output voltage outputted from the voltage input interface is not provided to a working circuit. When the output voltage outputted from the voltage input interface is greater than the lower limited voltage and less than the upper limited voltage, the logic control unit outputs a control signal to turn the switch unit on. The output voltage output from the voltage input interface is provided to the working circuit. |
