| 摘要 |
PURPOSE:To improve the waveform of input current easily, by a method wherein a reactor, connected between power source terminals and a rectifying circuit, is short-circuited intermittently by the switch of an inverter. CONSTITUTION:In a power unit, a reactor 3 and a filter circuit 5, operated by a capacitor 4, are connected to commercial AC power source terminals 1, 2 while the reactor 7 is connected to the output line 6 of the filter circuit 5 to employ it for the control of current. A rectifying circuit 12, consisting of four pieces of diodes 8-11 connected through bridge connection, is connected to said output line 6; an inverter 15, consisting of first - fourth switches A1-A4, is connected between DC lines 13, 14. Power is supplied to a load circuit through an output transformer 16 and an output rectifying circuit 23. In this case, the first - fourth switches Q1-Q4 of the inverter 15 are controlled so as to be short-circuited simultaneously with the driving of the inverter. As a result, energy is accumulated into or released out of the reactor 7, whereby the amplitude of the input current may be controlled.
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