| 摘要 |
An apparatus and method for continuous variable reactive impedance control. The apparatus and method enable the continuous variation of the reactive impedance of an oscillating circuit. A reactive component, in one embodiment a capacitor, is switched into the oscillating circuit for a duration at the beginning and end of each half cycle of the oscillation frequency. Through varying the duration, the oscillation frequency is varied between the frequency that occurs without the reactive component in the circuit and the frequency with the reactive component permanently in the circuit. A controller determines the duration a nd controls a switch coupled to the reactive component. The apparatus and metho d may be used to adjust the oscillation frequency of a resonant circuit or to match the resonant frequency to a driving frequency in a driven oscillating circui t so as to improve efficiency.
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