The electronic transformer introduced in this paper overcomes the shortcomings of traditional silicon steel sheet transformers in terms of volume, weight, low efficiency and high price. The circuit is mature and the performance is stable.
The working principle of the electronic transformer circuit diagram: The working principle of the electronic transformer is similar to that of the switching power supply. The VD1-VD4 rectifies the mains to DC, then enters the DC into a high-frequency current of several tens of kilohertz, and then uses the ferrite to the high frequency. High voltage pulse step-down. 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. See the table below for a list of component selection and manufacturing components.
L1, L2, and L3 are wound around a magnetic ring of H7 × 4 × 2 mm 3 , L1 and L2 are wound around 6 åŒ; and L2 is wound by 1 åŒ. L4 and L5 are wound around a magnetic ring of H31×18×7, L4 is wound with a high-strength wire of Φ=0.1 mm, and 340 turns; L5 is wound with a high-strength wire of Φ=1.45 mm. VT1, VT2 select high-voltage silicon tube with pressure resistance BVceo ≥ 350V. Other components have no special requirements.
When the circuit works 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 about 25V. Changing the number of turns of L5 changes the output voltage. If it does not oscillate, check if the phase of VT1, VT2 and L1, L2, L3 is normal (exchange the two wires of L3).
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