JPS5441248A - Power source synchronizing timign set up circuit - Google Patents

Abstract

PURPOSE: To easily obtain the time limit synchronized with alternating power source, by using analogue control element, such as variable resistor etc., as the timing set up device of timer circuit for resistance welding machine and forming asynchronous time limit as the power source through a simple synchronous control circuit.

CONSTITUTION: Selection of the analogue switch 2 is determined by each bit output condition of the ring counter 3 composed of the shift register and gate circuit at the timer circuit for resistance welding machine and the value of selected timing set up device 1 is taken in the timing set up circuit 4 composed of IC for timer etc. and then, time limit digital signal is formed. Basing on the above signal, the one shot circuit 5 making clock pulse, is connected with clock input of the counter 3 together with starting pulse. Alternating power source voltage is inputted in the pulse conversion circuit 7 through the transformer 6 and the above signal is made as clock signal. Then, the clock signal is connected with the D type flip flop circuit 8 converting welding current charge time limit signal QW to D input signal and the bit output E is synchronized with QW.

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