Auto-excitation type LED conversion device for achieving electrodeless light dimming and control method

Abstract

The invention discloses an auto-excitation type LED conversion device for achieving electrodeless light dimming and a control method. The auto-excitation type LED conversion device comprises a passive damping light dimming self-adaptation circuit, an AD-DC rectifying circuit, a light dimming flickering stabilization engine circuit, a light dimmer restraining peak voltage and current circuit, an LC filtering circuit, an auto-excitation oscillating circuit, a self-detection linear constant current compensating circuit, an overvoltage detection protective circuit, an LED module temperature protection circuit and an LED module. The auto-excitation oscillating circuit is connected with the other circuits. According to the auto-excitation type LED conversion device, the passive damping light dimming self-adaptation circuit, the light dimming flickering stabilization engine circuit and the light dimmer restraining peak voltage and current circuit are additionally arranged at the front end of an LED load, so that linear brightness variation is achieved when a silicon controlled light dimmer conducts electrodeless light dimming, and flickering light which excites the eyes of people is not generated; meanwhile, the auto-excitation type LED conversion device is simple in circuit structure, the manufacturing cost is low, the electrodeless light dimming function can be achieved, and the defect that light dimming cannot be achieved through an RCC auto-excitation type circuit on the market or the light dimming effect of the RCC auto-excitation type circuit on the market is poor is overcome.

Description

technical field [0001] The invention relates to the research field of LED control circuits, in particular to a self-excited LED conversion device suitable for dimmers to realize stepless dimming. Background technique [0002] With the development of the global economy, the problems of resource shortage and environmental pollution have become more and more prominent. In order to alleviate the pressure on global energy and environmental protection, LED has been introduced into the field of lighting as a revolutionary technological innovation. LED light source has the characteristics of high energy saving, environmental protection, long life, vibration resistance and strong controllability. LED lighting products are lighting fixtures manufactured using LED light sources. [0003] While lighting products are becoming more and more innovative, the dimming function of LED products further embodies the advantage of being more energy-saving than traditional lighting fixtures. The L...

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Problems solved by technology

[0009] 1. It is necessary to specifically detect the conduction angle of the dimming power supply, which cannot solve the problems of dimming flicker and dimming mutation

[0010] 2. Control device is required, the control circuit is complicated, and the cost is high, which is not conducive to mass production of products

[0011] 3. Not compatible with thyristor dimmers on the market

[0012] 4. The traditional RCC self-excited oscillation circuit has no special overvoltage protection circuit, which is prone to LED burnout

[0013] 5. The traditional RCC self-excited oscillation circuit does not have a special linear constant current compensation circuit for closed-loop control, resulting in poor constant current accuracy and obvious shortcomings. With the fluctuation of the input voltage, the output current of the LED module fluctuates greatly, which may easily cause the LED to overheat or even burn out.

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