Current control circuit

A current control circuit for a driving circuit system of a LED assembly, wherein the driving circuit system comprises a current module, a rectifier, and a thyristor, the thyristor is connected in series between an AC power supply and the rectifier, the rectifier rectifies an input AC voltage provided by the thyristor and provides a rectified voltage to an anode of the LED assembly, and an input terminal of the current module and a cathode of the LED assembly are connected to set a current flowing through the LED assembly, and the current control circuit comprises:

• a first transistor and a transistor control circuit, wherein a drain of the first transistor is connected to the anode of the LED assembly, a gate of the first transistor is connected to a control voltage output terminal of the transistor control circuit, the first transistor is turned on or turned off according to a control voltage provided by the control voltage output terminal of the transistor control circuit, and the drain current of the first transistor and the current flowing through the LED assembly determine a feedback voltage for the transistor control circuit;
• wherein the feedback voltage enables the transistor control circuit to turn on the first transistor and the drain current of the first transistor provides a compensation current for the thyristor, when the current flowing through the LED assembly is less than a preset current;
• wherein the feedback voltage enables the transistor control circuit to turn off the first transistor, when the current flowing through the LED assembly is more than or equal to the preset current;
• wherein the preset current is set according to a holding current of the thyristor.