POWER SUPPLY DETECTING CIRCUIT FOR VENDING MACHINE

摘要

A power supply detecting circuit for detecting a power supply status of a controlling system of a vending machine, includes a port equipped on the controlling system, a power supply unit, an alarming unit, and a switch unit. The port outputs a high level voltage signal when a normal power is supplied to the controlling system. The power supply unit provides power to the alarming unit. The switch unit is connected between the alarming unit and ground. The switch unit is controlled by the port. The switch unit is turned off to switch off the alarming unit when the high level voltage signal is outputted from the port. The switch unit is turned on to switch on the alarming unit when the normal power is not supplied to controlling system and the high level voltage signal is not outputted from the port.

主权项

1. A power supply detecting circuit for detecting a power supply status of a controlling system of a vending machine, comprising:
a port equipped on the controlling system, the port configured to output a high level voltage signal when a normal power is supplied to the controlling system; a power supply unit; an alarming unit connected to the power supply unit, the power supply unit providing power to the alarming unit; and a switch unit connected between the alarming unit and ground, the switch unit controlled by the port, wherein the switch unit is configured to be turned off to switch off the alarming unit when the high level voltage signal is outputted from the port, and the switch unit is configured to be turned on to switch on the alarming unit when the normal power is not supplied to controlling system and the high level voltage signal is not outputted from the port.