Push-pull voltage converter on field-effect transistors, 9-15/220 volts 100 watts. Scheme, description

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Push-pull voltage converter on field-effect transistors, 9-15/220 volts 100 watts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

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A successful circuit of a push-pull converter with field-effect transistors, made using a specialized 1114EU4 PWM controller, is shown in fig. 4.39.

With the ratings indicated on the diagram, the conversion frequency is about 20 kHz. In the normal state, transistors VT1 and VT2 are closed and open by pulses coming from the output of the microcircuit. Chain C1, R2 provides a smooth exit to the operating mode. Voltage dividers on resistors R7, R9 and R8, R10 limit the output current of the microcircuit, as well as the voltage at the gates of the keys. Diode VD1 protects the circuit if the polarity of the power supply is connected by mistake.

Push-pull voltage converter on field-effect transistors, 9-15/220 volts 100 watts

The circuit works stably with loads up to 100 W, the only condition is that transistors VT1, VT2 must be installed on radiators. The efficiency of such circuits with careful manufacture of the transformer reaches 90%. When using modern field-effect transistors with an insulated gate in the circuit, the dimensions of the structure can be significantly reduced.

Transformer T1 is made on two ring cores folded together made of ferrite grade M2000NM, size K32x20x6. The primary winding contains 2x8 turns of PEL wire with a diameter of 0,8 mm. Secondary winding to obtain a voltage of 220 V - 300 turns with a PEL wire with a diameter of 0,25 mm. Feedback winding - 10 turns with PELSHO wire with a diameter of 0,25 mm.

Author: Semyan A.P.

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