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SIMPLE TWO-STEP VOLTAGE TRANSFORMER
Author of the article: A. Chaplygin
A two-stroke pulse generator was assembled on transistors. The positive feedback current flows through the transformer windings 3 and 4 and the load.
Due to the proportional-current control of the transistors, the switching losses and the efficiency are significantly reduced. The role of diodes, rectifying the output voltage, is played by emitter transitions of transistors.
The magnetic circuit of the transformer is the ring K18 × 8 × 5 from ferrite 2000НМ. Windings 1 and 2 contain 6 turns each, and 3 and 4 consist of 10 turns of insulated wire 0.5 mm in diameter. Each pair of windings are wound simultaneously in two wires.
The inverter is able to operate when the input voltage is reduced to 1V, the required number of turns is calculated by the formula:
Transistors are chosen based on the allowable values of the base current (it should not be less than the load current) and the reverse voltage of the emitter-base (it must be more than twice the difference between the input and output voltages). For operation in low-power converters, in many cases the transistors KT208, KT209, KT501, etc. are suitable. In this case, the transformer can be made on a circular magnetic core of smaller diameter.
print version
Author: A. Chaplygin, Kursk
PS The material is protected.
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