Light modulation control circuit applied to lighting control circuit of single wire
A dimming control circuit and lighting control technology, applied in lighting devices, light sources, electric light sources, etc., can solve problems such as deviation from resonance point, oscillation, light flickering, etc., and achieve the effect of overcoming high harmonic distortion
Inactive Publication Date: 2008-10-22
李佳伟
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Problems solved by technology
Due to the inherent characteristics of the thyristor, this kind of dimming circuit is affected by the load of the ballast. After the thyristor is triggered, it will cause "oscillation", that is, the current drops below the holding current after triggering, which will cause the triac to trigger and fail. Then turn off, this phenomenon will probably occur several times in each half cycle, this problem will cause the lamp to flicker
Moreover, due to the inherent characteristics of the existing dimming ballast circuit, the frequency increases at low brightness, which will deviate from the resonance point. At this time, because the tube voltage of the lamp tube rises at low brightness, the circuit will be unstable, and the lamp will also be damaged. will flash
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[0015] The present invention is applied to the dimming control circuit of the single-wire lighting control circuit, such as figure 1 As shown, the system consists of an input control circuit 1 serially connected to the live wire and an execution control circuit 2 connected between the live wire and the neutral wire. The input control circuit 1 can be installed in an ordinary switch panel (it can be in the form of a button or a rotary potentiometer), and can be controlled by the user. The execution control circuit 2 can be installed in an integrated energy-saving lamp or made into an electronic ballast type.
[0016] Such as figure 2 As shown, the input control circuit includes a bidirectional thyristor Q1 and a zero-crossing trigger circuit, and the zero-crossing trigger circuit includes a zero-crossing identification circuit 3, a brightening switch K-UP, a dimming switch K-DW, a control chip IC1 and its peripheral circuits The bidirectional thyristor Q1 is serially connecte...
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The invention discloses a dimming control circuit applied to a singlewire system illumination control wiring, comprising an input control circuit which is connected in series with a live wire and an execution control circuit which is spanned between the live wire and a neutral wire. The input control circuit turns a dimming action into two kinds of initial voltage signals; the execution control circuit turns the received voltage signals into a frequency hopping light current control action, so as to realize the dimming function. The dimming control circuit selects correct frequency points, adopts normal starting with 20 percent brightness of smallest load (single light works) of a light loop, guarantees continuous loop current in the whole dimming process, meets the smallest maintenance current of a controlled silicon, can perform frequency hopping work, avoids the problem that the working frequency is unstable after the working frequency deviates from resonance points while dimming, and guarantees the reliable dimming when the brightness of the light is between 100 and 20 percent.
Description
technical field [0001] The invention relates to a dimming control circuit of an illumination control circuit, in particular to a dimming control circuit applied to a single-wire illumination control circuit. Background technique [0002] At present, most of the existing lighting control circuits adopt the thyristor phase control method for dimming. The conduction part in the whole cycle of the AC power supply is controlled by the thyristor, and the conduction time is received by the ballast, converted into a voltage change, and then Control the voltage-controlled oscillator to change the operating frequency of the ballast to achieve the purpose of dimming. Due to the inherent characteristics of the thyristor, this kind of dimming circuit is affected by the load of the ballast. After the thyristor is triggered, it will cause "oscillation", that is, the current drops below the holding current after triggering, which will cause the triac to trigger and fail. Following shutdown...
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IPC IPC(8): H05B41/39
Inventor 李佳伟
Owner 李佳伟