发明名称 |
Oscillation control apparatus for ultrasonic oscillator |
摘要 |
In an oscillation control apparatus for an ultrasonic oscillator, an FET circuit is connected to an oscillation circuit for varying a resistant value of a resistor unit of the oscillation circuit, which determines a free-running frequency thereof. A phase-difference detecting circuit is provided for detecting a relative phase difference between voltage and current in the ultrasonic oscillator. A threshold discrimination circuit outputs a signal when the phase difference inputted from the phase-difference detecting circuit exceeds at least a predetermined value. A pump circuit integrates the signal from the threshold discrimination circuit. A resistant value of the FET circuit varies when an output signal from the pump circuit exceeds a predetermined value.
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申请公布号 |
US5001442(A) |
申请公布日期 |
1991.03.19 |
申请号 |
US19900517348 |
申请日期 |
1990.05.01 |
申请人 |
STANLEY ELECTRIC CO., LTD. |
发明人 |
HANAIE, TSUGITAKA;IWAKI, KUNIO;YOKOYAMA, YORIMI |
分类号 |
B06B1/06;B06B1/02;E04G21/18 |
主分类号 |
B06B1/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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