A simple converter, 12/220 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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Many radio amateurs make transformer circuits with a midpoint. The proposed scheme (Fig. 4.37) in some cases does not even require the manufacture of a transformer. You can use a ready-made 12-volt one, and if the no-load current of the low-voltage winding is less than 1,5 A, and you are ready to put up with low efficiency, then use it.
If you have two such transformers, then by connecting them, as shown in fig. 4.37 you can get a small no-load current and a higher efficiency. Four output transistors are placed on small heatsinks. L1 is wound with a 0,5 mm wire around a high-resistance resistor - the more turns that fit, the better.
(click to enlarge)
Resistor R1 sets the conversion frequency to 50 Hz. In the presented form, the circuit can operate at a power of up to 150 W, after minor alterations, the power can be increased.
Author: Semyan A.P.
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