| 摘要 |
PURPOSE:To supply a voltage of desired frequency to a load without reducing a conversion efficiency by providing a variable inductance based on a magnetic amplifier at a part of a resonance DC/AC converter. CONSTITUTION:A load 1 is provided through a transformer 1 at both ends of a resonance capacity element C via a DC/AC converter having a pair of switches Q1, Q2, and a magnetic amplifier 3 is connected with the capacity element C. The amplifier 3 has inductance elements L1, L2, rectifiers D3, D4 for magnetically amplifying and a resistor R0 and a variable DC power source EMB. Thus, a controller 2 turns OFF the switch Q1, On the switch Q2, reversely turns ON and OFF, and supplies its output to the load 1. The variable inductance is regulated by the amplifier 3 to vary the self-resonance frequency of a load system to apply a desired fixed frequency to the load 1.
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