发明名称 Photosensor circuits including a switch mode power converter, a driver transistor and a relay coil
摘要 Photosensor circuits include a relay coil configured to control application of an alternating current (AC) power source to a load. The circuit includes a pulse width modulator circuit configured to generate a pulse width modulated signal having a pulse width that varies responsive to an average voltage across the relay coil. A photo control circuit is configured to control application of the pulse width modulated signal to a drive transistor responsive to a detected light level. A power circuit includes a rectifier circuit and a voltage divider circuit configured to generate a regulated power signal. A outputs a current responsive to a level of light detected by the phototransistor. A low pass filter circuit is coupled to a first terminal of the phototransistor filters the output current of the phototransistor to provide a light level signal voltage and a select transistor couples the pulse width modulated signal to the drive transistor responsive to the light level signal voltage having a selected level.
申请公布号 US8026470(B2) 申请公布日期 2011.09.27
申请号 US20080255881 申请日期 2008.10.22
申请人 TYCO ELECTRONICS CORPORATION 发明人 FLAHERTY RICHARD CHARLES
分类号 H01J40/14 主分类号 H01J40/14
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