| 摘要 |
PURPOSE:To prevent lowering of input power factor and make the effective value of load apply voltage variable by providing a switch that controls a DC power source that fills troughs between pulsating current voltage waveforms and another DC power source voltage which is parallel to the power source and sends a higher output voltage to a load. CONSTITUTION:The first DC voltage source 1 that determines troughs filling basal voltage value is connected in parallel to an output of a full wave rectifier DB that makes full wave rectification of a commercial power source AC, and a voltage controlling device 3 that makes the first DC voltage source 1 generate trough filling boost voltage for controlling and a load R are connected in parallel respectively. Apply voltage of the load R becomes trough filling basal voltage value. On the other hand, the device 3 obtains troughs filling boost voltage for control by charging a capacitor C6 that constitutes a DC voltage source 2 through a diode D11. Effective value VRMS of load apply voltage can be made variable by discharging charge of the capacitor C6 to the load R through a circuit SW by controlling the conduction period of a switching circuit SW consisting of a transistor by a proper controlling circuit in optional time. |
