| 摘要 |
PURPOSE:To improve the accuracy of the timer time by a timer circuit, when the contact of a mechanical contact type switching relay is controlled by a timer circuit. CONSTITUTION:The output terminal of a comparator 212 is connected to the other side input end of an AND circuit 202 through an inverter 224, and, provided that a low level signal from the output terminal of the comparator 212 is being output, and at the time the output terminal of the comparator 212 is made in a high level while a transistor 204 is turned ON, the transmission of the ON signal of the transistor 204 from the input terminal of the AND circuit 202 is cut off regardless of the operation of a relay switch. As a result, at the time the output of the comparator 212 is made in a high level without depending on the operation of the relay switch, the charging of a capacitor 208 can be stopped so as to start the discharge instantly, and the accuracy of the timer time can be obtained. |
