High-power factor primary side feedback phase cut dimming LED driving circuit
A high power factor, LED driving technology, applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve problems such as poor adaptability, low power factor, unsatisfactory compatibility, etc., to solve cost and performance problems, realize cost Low, the effect of low-cost related chips
Active Publication Date: 2017-05-31
郑榕彬
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Problems solved by technology
[0002] At present, LED phase-cut dimming drive circuits generally have a power factor not higher than 0.7 (<0.7), or poor adaptability to the input voltage in the non-phase-cut dimming state, and the input power often changes with the input voltage. , the compatibility under the two usage states is not ideal
Some solutions with good effects have the problem of expensive control chips
It is difficult to find a simple, cheap, and effective LED phase-cut dimming drive circuit on the market, which limits the application of replacing incandescent lamps with LED lamps for phase-cut dimming, which is not conducive to energy saving
Method used
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Embodiment Construction
[0016] figure 1 is a schematic block diagram of a circuit according to an example embodiment of the present invention. Such as figure 1 As shown, in an example embodiment, the LED drive circuit includes: full-wave rectification circuit 1, decoupling circuit 2, EMC suppression circuit 3, power supply circuit 4, thyristor matching circuit 5, loop compensation adjustment circuit 6, high The power factor primary side feeds back the constant current control circuit 7 and the output control circuit 8 . The full-bridge rectifier circuit 1 is connected to the input AC power, and rectifies the input AC power into positive half-cycle DC power, which is provided to the decoupling circuit 2 , thyristor matching circuit 5 and loop compensation adjustment circuit 6 . The decoupling circuit 2 isolates the detection input terminal of the loop compensation adjustment circuit 6 from other circuits using positive half-cycle direct current, so that the loop compensation adjustment circuit 6 can...
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The present invention relates to a high-power factor primary side feedback phase cut dimming LED driving circuit. The circuit comprises a full-wave rectification circuit (1), a decoupling circuit (2), an EMC suppression circuit (3), a supply circuit (4), a silicon controlled match circuit (5), a loop compensation adjustment circuit (6), a high-power factor primary side feedback constant current control circuit (7) and an output control circuit. The high-power factor primary side feedback phase cut dimming LED driving circuit detects the waveform of the input voltage after the full-wave rectification circuit (1) is rectified to realize that the current outputted to the LED is constant in a wide input voltage range when the input voltage has no phase cut and perform active power factor correction so as to obtain a high-power factor; and when the input voltage has the phase cut, the loop compensation parameter of the high-power factor primary side feedback constant current control circuit (7) is changed according to the changing of the phase cut angle to allow the current outputted to the LED not to remain constant in each half-wave period and allow the current outputted to the LED to change with the changing of the phase cut angle to realize the dimming function.
Description
technical field [0001] The present invention generally relates to analog and digital signal processing, and specifically relates to an LED drive circuit with high power factor and phase-cut dimming. Background technique [0002] At present, LED phase-cut dimming drive circuits generally have a power factor not higher than 0.7 (<0.7), or poor adaptability to the input voltage in the non-phase-cut dimming state, and the input power often changes with the input voltage. , the compatibility under the two usage states is not ideal. Individual effective solutions all have the problem of expensive control chips. It is difficult to find a simple, cheap, and effective LED phase-cut dimming drive circuit in the market, which limits the application of replacing incandescent lamps with LED lamps for phase-cut dimming, which is not conducive to energy saving. Contents of the invention [0003] The invention provides a high power factor primary-side feedback phase-cut dimming LED d...
Claims
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Inventor 郑榕彬
Owner 郑榕彬