| 摘要 |
[PROBLEMS] To provide a constitution of a feedback circuit for stabilizing the DC voltage produced by rectifying a high-frequency AC current outputted from a resonance circuit against a load in a wide range and a method for giving the circuit constant. [MEANS FOR SOLVING PROBLEMS] An equivalent power supply for deriving the condition that the feedback of the carrier for driving the resonance circuit of the output voltage to the frequency of the carrier is stabilized is introduced. A virtual resonance circuit corresponding to the resonance circuit of an equivalent power supply receives the frequency-modulated carrier similarly to the resonance circuit and outputs not the amplitude-modulated carrier but its envelope. A virtual rectifying/smoothing circuit corresponding to the rectifying circuit acts as a first-order lag filter on the envelope and produces an output voltage of the equivalent power supply. The equivalent power supply is described by a simultaneous differential equation system, a mathematical analysis is made to derive the sufficient condition to stabilize the equivalent power supply. Under the sufficient condition, a circuit realizing a stable feedback is constituted and the stability of the circuit is demonstrated by simulation.
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