Converter 12/220 volts on field-effect transistors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The use of powerful field-effect transistors makes it possible to significantly simplify the circuit and increase the efficiency of the converter. A diagram of such a variant of the converter is shown in fig. 4.38.
A master oscillator with a frequency of 1.1 Hz is assembled on the elements DD1.2, DD500. The divider on DD2 generates two pulse sequences with a frequency of 50 Hz with phases shifted by 180 ° to control the power switches VT1 and VT2 of a push-pull converter.
To avoid through switching currents, there is a "dead zone" equal to 10% of the period duration between turning off one key and turning on the other. When a high level (logical "1") is applied to the "Lock" input, both output keys are locked. The output power of the converter is limited by the power of the power transformer T1 and the maximum allowable current of the output transistors. The transformation ratio of the power transformer Kt = 20.
IRFZ034 (15 A), IRFZ044 and RG723A (30 A), IRFZ046 (50 A), IRFP064 (100 A) are suitable as output transistors.
For the reliability of the device, it is recommended to have a double current margin and a triple voltage margin. Power circuits should be as short as possible and made with wires of the appropriate section.
Author: Semyan A.P.
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