| 摘要 |
PURPOSE:To shorten a resetting time required to cut off a source voltage and reset a timer circuit, by providing nearly a capacitor which has large capacity and applies a charging voltage to a relay. CONSTITUTION:When the charging voltage of a capacitor CT attains to a specific threshold level, the timer circuit 1 finishes time clocking operation and supplies a gate trigger signal to a tyristor 2, which turns on a predetermined time after the power source is turned on and then holds itself thereafter, so that the relay Ry is driven continuously by the charging voltage of a capacitor C2. The capacity of the capacitor C2 is small, so the charging voltage of a cpacitor C1 is reset to zero instantaneously. Therefore, the resetting time is shortened to about 5 msec. |
