| 摘要 |
PURPOSE:To eliminate the noise due to electromagnetic sound by controlling a current flowing through a control side coil by a current controller and controlling the impedance of a load side coil. CONSTITUTION:When the resistance of a variable resistor 14 is zero, the synthetic resistance value of a load voltage regulator 32 is only the resistance value of a semi-fixed resistor 13, a current flowing through the base of a transistor 28 increases, and the current which flows from a DC power source circuit 21 through a resistor 34, between the collector and the emitter of the transistor 28 to the control side coils of reactors 26, 26' increases. Accordingly, the reactors 26, 26' approach saturated state, the impedance of the load side coil becomes small, and the maximum voltage is applied to the load 3. In this manner, the voltage to be applied to the load 3 can be arbitrarily set by regulating the resistances of the resistors 12, 13 by switching a changeover switch 11. |
