Automatic door driving system

Claim 1

An automatic door driving system, in which an AC power source and a battery power source are connected through an emergency battery unit to an automatic door controller for controlling an automatic door drive motor, also in which normally said automatic door controller is supplied with power from said AC power source for normal operation of an automatic door by said automatic door controller, while power supply from said battery power source to said automatic door controller is inhibited and said battery power source is charged from said AC power source, further in which at the time of power stoppage said emergency battery unit is switched for power supply from said battery power source to said automatic door controller so that said automatic door is subjected to normal operation or operation at the time of power stoppage by said automatic door controller, and still further in which in case of emergency such as occurrence of a fire an external emergency signal is stored so that an emergency operation of said automatic door will be caused according to a predetermined program by said automatic door controller, and said emergency signal and a power stoppage signal are outputted to said automatic door controller, wherein said emergency battery unit includes an AC power source circuit for electrically connecting said AC power source and said automatic door controller to each other, a first relay provided in said AC power source circuit such as to be turned off at the time of power stoppage, a battery power source circuit for electrically connecting said battery power source and said automatic door controller to each other through a switch to be turned on when said first relay is rendered inoperative, a rectifier, a constant current circuit, a switch to be turned on when a fire signal circuit outputs a fire signal, said rectifier, said constant current circuit and said switch being serially provided between said AC power source circuit and said battery power source circuit, a fire signal circuit for outputting a fire signal according to an external situation at the time of occurrence of a fire, a self-holding circuit for holding a fire signal outputted from said fire signal circuit, and various signal output means for providing an operational state of said emergency battery unit to said automatic door controller.