| 摘要 |
PURPOSE:To dispense with the low voltage power source, to suppress the power consumption and to increase the working efficiency of the titled inverter device by a method wherein a DC input voltage is detected by utilizing the driving power source of the switching transistor on the main circuit. CONSTITUTION:When switches 23 and 25 are close-circuited by manipurating the switch 23 and the like, a push-pull inverter 3 is started. As a result, the output voltage of a rectifying circuit connected to a voltage detecting winding S5 increases, the output of a comparator is turned to a high level, an ON- posotion is given to a transistor, and contact points 21a1 and 21a2 are close- circuited by the excitation of a coil 21. Accordingly, a DC input voltage is added to an inverter circuit 1, and an alternative current is supplied to load 2. When the DC voltage is reduced for some reason, the output of the comparator 73 is turned to a low level, an OFF-position is given to the transistor Q7, a coil 21C is demagnetized, the contact points 21a1 and 21a2 are open-circuited, and the supply of power to the main circuit 1 is cut off. |
