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1. 发明授权

US3793557A Dimmer circuit and gapped core inductor useful therewith 失效
标题翻译： DIMMER电路和带隙电感器有用
公开(公告)号：US3793557A
公开(公告)日：1974-02-19
申请号：US3793557D
申请日：1972-07-17
申请人： BERKEY COLORTRAN
发明人： CRAMER M
IPC分类号： G05F1/445 , H01F38/02 , H05B37/02 , H05B39/08 , H05B39/04
CPC分类号： H01F38/023 , G05F1/445 , H05B37/02 , H05B39/083 , Y10S315/07
摘要： In a dimmer circuit a summing amplifier combines a light intensity control voltage with a feedback voltage derived from the thyristor controlled ac power supplied to the lamp load. The summing amplifier output establishes the steepness of a ramp signal produced each ac half cycle by a ramp generator. A trigger circuit fires the thyristor device when the ramp signal reaches a certain level. In the feedback circuit a signal transformer coupled from the load is rectified, shaped by filter networks at the rectifier input and output, and used to charge a capacitor via an isolation amplifier. This capacitor provides a feedback voltage which, when summed with the control voltage, achieves a desired functional relationship between control voltage and light intensity, with compensation for load variation. A gapped core inductor is series connected with the ac supply to minimize certain adverse effects associated with turn-on of the thyristor device. Thus, use of the inductor reduces lamp filament vibration and minimizes inductive coupling to adjacent audio and other low level circuits. The inductor core includes both small and large air gaps to provide maximum inductance over a wide range of load current.
摘要翻译：在调光电路中，求和放大器将光强度控制电压与从提供给灯负载的可控硅控制的交流电源导出的反馈电压相结合。求和放大器输出通过斜坡发生器建立每个交流半周期产生的斜坡信号的陡度。当斜坡信号达到一定水平时，触发电路触发晶闸管器件。在反馈电路中，从负载耦合的信号变换器被整流，通过整流器输入和输出处的滤波器网络整形，并用于通过隔离放大器对电容器充电。该电容器提供反馈电压，当与控制电压相加时，在控制电压和光强度之间达到期望的功能关系，并对负载变化进行补偿。

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