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.