| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem of remarkably low efficiency of an output to a light load corresponding to a frequency distant from a resonance frequency in stabilization of an output voltage in a way that a DC voltage obtained by rectifying an output of a resonant circuit driven with a carrier is fed back to a frequency of the carrier. Ž<P>SOLUTION: An integrated amplifier, by which two independent variables are used as input, is introduced. If an output circuit, which is driven by the integrated amplifier, outputs a scalar target variable, a condition for designing feedback is sought while considering two inputs in the same way as a positive input and a negative input of a usual operational amplifier. Based on the condition, a circuit for stabilizing the output voltage in a way that a DC current, which has been obtained by performing rectification and smoothness of a radio frequency alternating current generated from the resonant circuit, is fed back to frequency and amplitude of the carrier driving the resonance circuit. In this circuit, the feedback to the amplitude decreases the amplitude of the carrier so that the frequency of the carrier, which corresponds to an output to a small load, does not go away from the resonance frequency to such an extent that efficiency may remarkably decrease, and thereby, decrease in efficiency can be improved. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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