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    • 27. 发明申请
    • 电子调光镇流器的调光控制信号传输电路
    • WO2008138223A1
    • 2008-11-20
    • PCT/CN2008/000927
    • 2008-05-12
    • 张波
    • 张波
    • H05B41/38
    • H05B41/42H05B41/39
    • The invention discloses a dimming control signal transmission circuit of the electronic dimming ballast comprising: a dimming switch circuit, a positive half cycle checkout voltage division circuit, a negative half cycle checkout voltage division circuit and a digital potentiometer. The AC power supply passes through the dimming switch circuit, connecting a control input of the digital potentiometer through the positive half cycle checkout voltage division circuit and connecting another control input of the digital potentiometer through the negative half cycle checkout voltage division circuit at the same time. The trigger state of the switch of the dimming switch circuit is changed, and then the positive half cycle checkout voltage division circuit or the negative half cycle checkout voltage division circuit is selected to be in work to change the high or low level potential input to the two control inputs of the digital potentiometer. The digital potentiometer determines the voltage output to dimming control terminal of the dimming ballast circuit based the potential state of its two control inputs, and changes its output power to adjust the luminance of the fluorescent lamp.