Method and system for supplying multiple led drivers using the same traic dimmer

A dimmable LED driver system comprising a dimmer and at least one LED driver, each LED driver comprising:

• an AC-to-DC converter that matches the characteristics of the dimmer;
• a transformer for storing energy and for changing the voltage level;
• an output section for supplying power to LED(s) for lighting;
• and
• a PWM controller and a switcher, both of which are used for control of the output power;
• wherein the dimmable LED driver system is controlled by the dimmer;
• the at least one LED driver uses an RCD transient absorption circuit;
• a first port and a second port of the RCD transient absorption circuit connect to a first end and a second end of the primary winding of the transformer respectively;
• and the first port of the RCD transient absorption circuit connects to an output of the AC-to-DC converter.

A method that employs a dimmer to perform the dimming function on a plurality of LED drivers, the method comprising the steps of:

• installing an RCD transient absorption circuit into each of the plurality of LED drivers, wherein the RCD transient absorption circuit includes a power-trimming device;
• choosing one LED driver as a reference driver;
• setting the dimmer to a conduction angle;
• adjusting the conduction angle such that the reference driver delivers an output current that is 1% within full-load current;
• measuring output current level of each of the plurality of LED drivers other than the reference driver;
• and
• adjusting the power-trimming device of the RCD transient absorption circuit in each of the LED drivers such that the output current is the same as that of the reference driver.