| 摘要 |
PURPOSE:To prevent malfunctions for the input voltage supplied by a contactless switch and to extend the range of the input voltage, by providing a switching means, where the operation is different by the level of a DC voltage value, in parallel with a voltage multiplying rectifying circuit. CONSTITUTION:If the output voltage of a half-wave voltage multiplying rectifying circuit 11 is lower than a voltage which a Zener diode 34 requires, a transistor TR31 of the second switching means A is conductive, and a TR15 of the second switching means is nonconductive; and after a prescribed time, the time set to a timer IC14 is up, and the TR15 becomes conductive, and the TR31 becomes nonconductive. If the output voltage of the half-wave voltage multiplying rectifying circuit 11 is higher than the voltage which the Zener diode 34 requires, the TR31 of the second switching means A is always conductive. Thus, malfunctions are difficult to generate when an input voltage is supplied by a contactless switch, and the range of the input voltage is extended. |
