The converter is designed to power various low-power equipment for alternating current 220V from an automotive power source.The frequency of the alternating current at the output is close to 50 Hz. The output voltage is not stabilized, but it can be controlled with a multimeter and regulated with a variable resistor.
Power of loading no more than 100W.
The diagram is shown in the figure. It is based on the TL594 microcircuit designed for operation in switching power supplies with a push-pull output and pulse-width regulation / voltage stabilization.
The equivalent generation frequency is 50 Hz, it is set by the resistance of the resistor R5, and depends on this resistance and the capacitance of the capacitor C5.
Resistor R4 controls the duty cycle of the output pulses. They can adjust the output voltage.
The outputs of the microcircuit are outputs 9 and 10, antiphase pulses are allocated to them, slightly delayed relative to each other so as not to cause a through current in the output stage circuit at the time of switching. Pulses arrive at the powerful key field-effect transistors VT1 and VT2 . Diodes VD2 and VD3 protect these transistors from negative EMF emissions on the primary winding of a pulse transformer T1.
The T1 transformer is a ready-made low-frequency power transformer with a rated power of 100W, with one primary winding at 220V and a secondary winding at 18V with a tap from the middle. You can try a transformer with a secondary winding of 12V with a tap from the middle or 24V with a tap from the middle. But, in the second case, I'm afraid that the output voltage will be slightly less than 220V.
The transformer is turned on “back to front”, that is, its secondary low-voltage winding now serves as the primary, and the high-voltage primary, as the secondary.
By connecting the load and a multimeter (or another AC voltmeter) with the resistor R4, set the voltage to the load 220V.
Author: V. Teplyakov