ELECTRONIC LOCK CONTROLLING CIRCUIT

PROBLEM TO BE SOLVED: To prevent a solenoid from burnout by providing a time switch to cut a driving signal which is given a transistor after passing a predetermined time when the driving signal having more than the predetermined time is given to a two directions maintaining solenoid driven by the transistor and to the solenoid from the outside. SOLUTION: An electronic lock controlling circuit is constituted of a circuit constitution which includes a transistor Q1 which works as a line switching when a solenoid 1 is operated, a transistor Q2 which drives the transistor Q1 by receiving a pulse signal from a software, and a transistor Q3 which so operates as the transistor Q2 not to make on for a constant time even in an abnormal state of the signal from the software being latched in a high level, a resistor R3 to determine the time width and a capacitor C1 being added. And in a normal operating time the transistor Q2 is made on by a pulse electronic lock controlling signal, and the transistor Q1 operates by becoming on to drive the solenoid 1.