发明授权
- 专利标题： Power frequency detection system
- 专利标题（中）： 电力频率检测系统
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申请号： US815312申请日： 1986-01-02
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公开(公告)号： US4622478A公开(公告)日： 1986-11-11
- 发明人: Masahiro Ise , Hidehiko Tanaka , Katsuyuki Machino , Toshiyuki Matsubara , Teiji Terasaka
- 申请人： Masahiro Ise , Hidehiko Tanaka , Katsuyuki Machino , Toshiyuki Matsubara , Teiji Terasaka
- 申请人地址： JPX Osaka
- 专利权人： Sharp Kabushiki Kaisha
- 当前专利权人： Sharp Kabushiki Kaisha
- 当前专利权人地址： JPX Osaka
- 主分类号： G01R23/00
- IPC分类号： G01R23/00 ; H03K5/1536 ; H03K5/153 ; H03K5/00
摘要：
A signal transmission system utilizes the building or house wiring as the data transmission line. A frequency detection system is required to detect a frequency of the power voltage. The frequency detection system includes a zero-crossing detection circuit for developing a detection output when the zero-crossing is detected. A timer element is provided in the frequency detection system, which functions to neglect an output signal from the zero-crossing detection circuit for a preselected period of time after the last detection output has been developed from the zero-crossing detection circuit.
公开/授权文献
- US5973909A Capacitor and method with extraneous plate surface area 公开/授权日：1999-10-26
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