| 摘要 |
PURPOSE:To reduce the power loss of a power source by performing a voltage control by a coil. CONSTITUTION:A switching circuit which has a coil L1, diodes D1, D2, a transistor TR3, capacitors C1, C2, and a resistor R3 is provided. A pulse obtained at a converter transformer T is rectified by the diode D2, and smoothed by the capacitor C2 into a DC voltage. This voltage is applied through a coil L2 to the collector of the switching transistor TR3. The emitter of the transistor TR3 is grounded through the capacitor C1, and connected to a power terminal of a drive circuit 1. A coil A is provided in the transformer T to obtain the reverse polarity voltage of the collector voltage of the transistor TR1, thereby switching the transistor TR3. The collector current of the transistor TR3 can be freely controlled by selecting the value of the coil L1, and the voltage of the terminal B can be freely selected. |
