Control circuit for driving different color temperature LED lights with AC input voltage

A control circuit for driving different color temperatures LED lights with AC input voltage, comprising:

• a first LED light set (A) with one color temperature;
• and
• a second LED light set (B) with another color temperature;
• two AC input voltages (L1 and L2);
• wherein the LED light sets (A and B) are arranged in parallel;
• the positive pole of the LED light sets (A and B) relate to the output of a step-down and constant current source circuit;
• the negative pole of the first LED light set (A) is connected with the anodes of first switch (Q1), the negative pole of the second LED light set (B) is connected with the anodes of second switch (Q2), the cathodes of the switches (Q1 and Q2) are connected with the output of a step-down and constant current source circuit;
• the two switches (Q1 and Q2) are arranged in parallel and controlled by a control circuit;
• wherein the control circuit drives either or both of the LED light sets (A and B) by the two switches (Q1 and Q2), thus to generate three different color temperatures, wherein the control circuit is comprising:
• two half-wave rectifier circuits;
• two optical couplers (OT1 and OT2);
• wherein the first half-wave rectifier circuit and first optical coupler (OT1 are arranged between the AC input voltage (L1) and the switch (Q1) to control the first switch (Q1);
• and the second half-wave rectifier circuit and second optical coupler (OT2) are arranged between the AC input voltage (L2) and the switch (Q2) to control the second switch (Q2).