LED dimming drive system with thyristor bypass dimming circuit

Abstract

The invention relates to a light-emitting diode (LED) dimming driving system with a silicon controlled bypass dimming circuit. The LED dimming driving system with the silicon controlled bypass dimming circuit comprises an alternating current / direct current (AC / DC) LED constant current actuator and a LED light string, wherein the input end of the AC / DC LED constant current actuator is electrically connected with an alternating current electric supply, the output end of the AC / DC LED constant current actuator is connected with the LED light string, the silicon controlled bypass dimming circuit is arranged, the input end of the silicon controlled bypass dimming circuit is connected with the alternating current (AC) electric supply, and the output end of the silicon controlled bypass dimming circuit is connected with a dimming interface of the AC / DC LED constant current actuator. The AC / DC LED constant current actuator obtains energy from the AC electric supply, and outputs a constant current value to drive the LED light string. The AC / DC LED constant current actuator is provided with an analog dimming interface which is used for adjusting an output current value according to an analog voltage amplitude value of an input dimming signal so as to change luminance of the LED light string. According to the silicon controlled bypass dimming circuit, the input end of the silicon controlled bypass dimming circuit is connected with the AC electric supply, and the output end of the silicon controlled bypass dimming circuit generates a smooth direct current analog voltage signal to serve as a dimming signal which is input into the analog dimming interface of the AC / DC LED constant current actuator. The value of amplitude of the dimming signal output by the silicon controlled bypass dimming circuit can be adjusted by adjusting an adjustable knob of the silicon controlled bypass dimming circuit, and thus a current value and the luminance of the LED light string can be adjusted.

Description

technical field [0001] The invention relates to an LED dimming driver system, in particular to an LED dimming driver system with a thyristor bypass dimming circuit, belonging to the technical field of LED lighting. Background technique [0002] LED has the advantages of high luminous efficiency, long service life, and good stability, and is widely used in the field of lighting. When using LED lighting or LED backlight, it is often required to be able to adjust the brightness of the LED. However, despite the continuous development of LED dimming technology, the shortcomings in efficiency, reliability and compatibility have been hindering the service life and popularization of LED lighting systems. [0003] At present, LED dimming technology can be roughly divided into: [0004] (1) Digital dimming; (2) Analog dimming; (3) PWM dimming; (4) SCR dimming. [0005] LED digital dimming technology is that the external controller sends digital signals to the LED driver through the...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the deficiencies existing in the existing LED thyristor dimming technology, the purpose of the present invention is to solve the complex structure of the existing LED thyristor dimming circuit, which is easy to generate a large number of harmonics, low power factor, low efficiency, easy to cause flicker, and For problems such as poor compatibility of LEDs, a LED dimming drive system with thyristor bypass dimming circuit is provided, which comprehensively utilizes the advantages of thyristor dimming and analog dimming to achieve simplicity and practicality, reduce harmonics, and improve power factor. , improve efficiency, solve flickering problem

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