| 摘要 |
A driving circuit converts a direct current (DC) power supply voltage into an alternating current voltage of a predetermined frequency. The alternating current voltage is applied to an electrical element and boosted by a voltage resonant circuit of the electrical element. Based on a change in input voltage of the electrical element and a frequency component of a feedback voltage corresponding to the output voltage of the electrical element, an input voltage monitoring circuit generates an optimal control signal, and, using the optimal control signal, adjusts the DC power supply voltage such that a step-down chopper circuit is switched on and off at a predetermined duty ratio.
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