| 摘要 |
PURPOSE:To activate the titled timer after an undefinite time is elapsed from the setting time by combining a short period pulse generating circuit, a long period pulse generating circuit and a counter generating an output when the sum of both pulses reaches a prescribed number. CONSTITUTION:A pulse generating means 4 generates a pulse synchronously with an AC input after a DC power supply 3 rises. Then when a switch circuit means passes a short-period pulse to a counter 8, a pulse from the pulse generat ing means 4 is fed at first to the switch circuit means 7, then the switch circuit means 7 is switched to the state inputting an output pulse of a long period pulse generating circuit 6 to the counter 8, and the counter 8 starts counting slowly the long period pulse in a form adding it to the count number of the short period pulse countered so far. Then the count number, that is, the total of the inputted high frequency pulse number and the long period pulse number reaches a prescribed number such as a full count of the counter 8, then an output is applied from the counter 8 to a switch means 9 to open/close the load circuit such as lighting fixture so as to close the means 9. |
