How Do Power Transformers Work Efficiently?

A power transformer is also a switching regulated power supply it is actually an inverter first, alternating current is converted into direct current, and then the electronic components are used to form an oscillator. Direct current is converted into high frequency alternating current. The required voltage is output through the switching transformer, and then the electronic transformer is widely used in various electrical appliances because of its small size, light weight and low price.

The principle of the power transformer is more complex following the analysis of the power transformer circuit diagram, 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 large power, and overcomes the disadvantages of large volume, heavy weight and high price of traditional silicon steel sheet transformer.

The principle of the electronic transformer is shown in the figure. The principle of the electronic transformer is similar to the switching power supply. Diodes vd1 to vd4 form a rectifier bridge that converts mains power into direct current. The high frequency oscillation circuit composed of the oscillating transformer triode vt1 and vt2 converts the pulsating direct current into high frequency current.

If the voltage does not meet the above values, or the power transformer circuit does not oscillate, check the circuit for welding errors, missed welding, or virtual welding. Then check that vt1 and vt2 are in good condition and that t1a and t1b are in correct phase. After the circuit assembly of the entire power transformer is adjusted successfully, it can be put into a small box made of metal materials to facilitate heat shielding, 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.