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1. 发明授权

US4551690A Automatic tuning circuit for use in an ultrasonic apparatus 失效
标题翻译：用于超声波设备的自动调谐电路
公开(公告)号：US4551690A
公开(公告)日：1985-11-05
申请号：US681085
申请日：1984-12-13
申请人： Eric Quist
发明人： Eric Quist
IPC分类号： H03J7/02 , H03L7/00
CPC分类号： H03J7/02
摘要： An automatic tuning circuit is provided for adjusting the frequency and phase of an oscillatory circuit in a power supply used for providing high frequency electrical energy to an electroacoustic converter. The oscillatory circuit includes an electrically variable inductance means in a feedback loop coupled between the output and an input of the oscillatory circuit and a switching device. The phase relationship of a signal indicative of the voltage across the switching device and a signal indicative of the state of the switching device and hence the current through the switching device is monitored. The inductance of the variable inductance means is adjusted responsive to the phase relationship of the signals indicative of voltage and current through the switching device for maintaining the two signals in phase during operation of the oscillatory circuit.
摘要翻译：提供了一种自动调谐电路，用于调节用于向电声转换器提供高频电能的电源中的振荡电路的频率和相位。振荡电路包括耦合在输出端和振荡电路的输入端之间的反馈环路中的电可变电感装置和开关装置。监视表示开关装置两端的电压的信号与表示开关装置的状态的信号的相位关系，并因此监视通过开关装置的电流的相位关系。响应于指示通过开关装置的电压和电流的信号的相位关系来调节可变电感装置的电感，以在振荡电路的操作期间保持两个信号同相。

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