发明名称 |
Oscillation circuit for proximity switch. |
摘要 |
<p>An oscillation circuit of a proximity switch includes a parallel LC resonance circuit (L, C), an oscillation transistor (Tr6) controlled by an output voltage from the resonance circuit for switching a constant current and a feedback circuit (Tr2, Tr3) for feeding back a current flowing through the oscillation transistor to the resonance circuit. In the circuit, there is further disposed a feedback current increase circuit including a second transistor (Tr7) controlled by an output voltage from the resonance circuit and a resistor (R) connected in series to the second transistor. The resonance circuit is supplied via the feedback circuit with a feedback current obtained by adding a current flowing through the feedback current increase circuit and a current passing through the oscillation transistor, thereby developing a large change in the amplitude of the oscillation.</p> |
申请公布号 |
EP0371489(A2) |
申请公布日期 |
1990.06.06 |
申请号 |
EP19890122021 |
申请日期 |
1989.11.29 |
申请人 |
OMRON TATEISI ELECTRONICS CO. |
发明人 |
KANDA, YOSHIMI OMRON TATEISI ELECTRONICS CO.;MATSUMOTO, AKIO OMRON TATEISI ELECTRONICS CO.;MATSUOKA, YASUSHI OMRON TATEISI ELECTRONICS CO.;AJIOKA, TSUTOMU OMRON TATEISI ELECTRONICS CO.;ENDO, HIROFUMI OMRON TATEISI ELECTRONICS CO.;MOTOUJI, SATOSHI OMRON TATEISI ELECTRONICS CO. |
分类号 |
G01V3/11;H03B5/12;H03K17/95 |
主分类号 |
G01V3/11 |
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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