Simple 220V inverter circuit for transformers with two terminals

Typically, the simplest converter from 12 to 220 V is built on one transistor and a transformer with a three-terminal primary winding. By positive feedback, the generator on the transistor is excited and generation occurs. The converted voltage is removed from the secondary winding. Despite the simplest circuit, such a converter has a number of big disadvantages, namely:

a transformer with such windings is difficult to sodium, they are usually rewound themselves;
The generation frequency cannot be changed, since it depends on the resonance.

The scheme described below does not have all these disadvantages. It uses a “walking” transformer, which can be found in old power supplies or chargers. The frequency can be adjusted to close to 50 Hz and power consumers sensitive to the output frequency.

The transformer has two windings. One is 220 V, the other is 12 V AC.

Name of required parts

Chip NE555 - http://alii.pub/5ws96j
Transistor IRFZ44N - http://alii.pub/5ct567
Resistors: 47 kOhm, 120 kOhm, 220 Ohm, 330 kOhm - http://alii.pub/5h6ouv
Capacitor 100 nF - http://alii.pub/5n14g8

Inverter circuit

The single-cycle converter (inverter) circuit consists of a powerful field-effect transistor switch IRFZ44N and a pulse generator built on the common NE555 counter chip. Using variable resistor R2, you can adjust the frequency of the generator.