The electronic transformer is also a switching power supply. It is actually an inverter. First, the AC power is converted into DC power, and then the electronic components are used to form an oscillator. The DC power is converted into high-frequency AC power. The required voltage is output through the switching transformer, and then the rectifier power supply uses the electronic transformer because of its small size, light weight, and advantages. It is often used in various electrical appliances.
The principle of the electronic transformer is more complicated. The following analysis of the electronic transformer circuit diagram shows that the input is AC220V, the output is AC12V, and the power is 50 W. It is mainly a transformer circuit developed on the basis of the high-frequency electronic ballast circuit. It has stable performance, small size, and high power, overcoming the shortcomings of traditional silicon steel sheet transformers such as large size, heavy weight, and high price.
Introduction to the principle of electronic transformers The principle of electronic transformers is shown in the figure. The principle of electronic transformers is similar to that of switching power supplies. Diodes vd1 to vd4 form a rectifier bridge to convert the mains power into DC power. The high-frequency oscillation circuit composed of oscillation transformer transistors vt1 and vt2 converts pulsating DC current into high-frequency current.
If the voltage does not meet the above value, or the electronic transformer circuit does not oscillate, check whether the circuit is welded incorrectly, leaked or cold. Then check whether VT1 and VT2 are in good condition, and whether the phases of T1A and T1B are correct. After the circuit assembly and adjustment of the entire electronic transformer are successfully completed, it can be placed in a small box made of metal material for easy shielding and heat dissipation, but attention must be paid to the insulation between the circuit and the shell. In addition, by changing the number of turns of the T2A and T2B coils, the output high-frequency voltage can be changed.
