12v electronic transformer circuit diagram

2019-04-09 15:04:02 JUKE CHINA ODM OEM Transformer factory Read

12v electronic transformer circuit diagram

The working principle of the electronic transformer is similar to that of the switching power supply. The VD1~VD4 converts the commercial power into DC, and then converts the DC into a high-frequency current of several tens of kilohertz, and then uses a ferrite transformer to step down the high-frequency and high-voltage pulses (such as Figure shows). In the figure, R2, C1, and VD5 are startup trigger circuits. C2, C3, L1, L2, L3, VT1, and VT2 constitute a high frequency oscillation portion.

12v electronic transformer circuit diagram.jpg

VD1~VD4 are 1N4007 rectifier diodes, and VD5 is a 32V trigger diode. L1, L2, and L3 are wound around a magnetic ring of H7 × 4 × 2 cubic meters, respectively, and the phase is as shown in the figure. L4 and L5 are wound around a magnetic ring of H31×18×7 cubic meters, and VT1 and VT2 are made of high-power silicon tubes with a withstand voltage of BVceo≥350V. There are no special requirements for other components.

When the electronic transformer is working normally, the working voltage at point A is about 215V, the point B is about 108V, the point C is about 10V, and the point D is 25V. If it does not oscillate, check if the phase of VT1, VT2 and L1, L2, L3 is normal. Changing the number of turns of L5 changes the output high frequency voltage.

Component serial number parameters: R1/1Ω/1WR2/200K, C1=0.01/100V, C2C3/0.47/250V, C4C5/1000P/1KV. VT1VT2/C3039L1L2/6T, L3/1T