Light-dimmer driving circuit

Abstract

The invention relates to a light-dimmer driving circuit. The light-dimmer driving circuit comprises a power supply input module, a transformer, a current output driving module, a pulse width modulation (PWM) module, an input voltage sampling module, an output voltage sampling module and a control center, wherein the power supply input module is mainly used for rectification and filtering of an input voltage signal, the transformer is used for voltage reduction of the voltage signal output by the power supply input module, the current output driving module is used for driving of current output according to the voltage signal which is transformed, the PWM module is used for adjusting output power of the current output driving module according to a control signal in the control center, the input voltage sampling module is used for sampling of the input voltage signal and transmitting the input voltage signal to the control center, the output voltage sampling module is used for sampling of output voltage and transmitting the output voltage to the control center, and the control center is used for controlling a PWM signal according to an input voltage sampling signal, an output voltage sampling signal and an input current signal. According to the light-dimmer driving circuit, due to the fact that the control center is used for controlling the PWM signal according to the input voltage sampling signal, the output voltage sampling signal and the input current signal, the output power of the current output driving module is enabled to change evenly, flicker-free light adjusting is achieved, constant current output is achieved, and range of the light adjusting is wide.

Description

technical field [0001] The invention relates to the field of dimming, in particular to a dimming driving circuit, which is especially suitable for dimming driving of LED lamps. Background technique [0002] With the increasingly serious energy crisis around the world, low carbon and environmental protection have become the focus issues, more and more people pay attention, and lighting as a major aspect of power and energy consumption has also attracted much attention. As a new concept solid light source, LED is recognized as one of the most promising new technologies in the world in the 21st century because of its remarkable advantages of energy saving, environmental protection, long life, no pollution, easy control and high efficiency. [0003] The lifespan of LED lamps depends largely on the performance of the driving power supply. The energy-saving performance of the LED lighting system is determined by the power consumption of the LED chip and the efficiency of the power...

AI Technical Summary

Problems solved by technology

The application of linear dimming is simple and does not cause interference, but it is not flexible and has low efficiency, and it will cause the LED spectrum to shift when reducing the LED current, and at the same time, it will generate too much heat due to voltage division, which will affect the life of the LED.

Thyristor dimming destroys the waveform of the sine wave, thereby reducing the power factor value, and at the same time increases the harmonic coefficient, which will generate serious interference signals on the line; and after the thyristor is turned on, a maintenance current is required to maintain the conduction If the current is not enough, the conduction angle will be unstable, the output waveform will be uneven, and vibrations and spikes will occur, adding such an unstable power supply output The LED light will flicker when it is on the LED light

At present, the application of PWM dimming is more extensive, but the PWM dimming of pure analog circuits is jumpy, and the LED will flicker during the dimming process, and the PWM dimming range of pure analog circuits is limited, and the cost of using integrated chips in the control center is relatively high

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