Chokeless voltage converter, 10-15/15-27 volts 3,5 amps. Scheme, description

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Chokeless voltage converter, 10-15/15-27 volts 3,5 amps. 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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The circuit of a chokeless pulse voltage converter is shown in fig. 4.69.

The circuit provides a voltage conversion of 12 V, a voltage of 15 ... 27 V at a load current of up to 3 ... 3,5 A. The oscillograms shown in fig. 4.70, explain the operation of the converter. The generator on DD1.1, DD1.2 forms a meander with a frequency of about 20 kHz. If the key transistors VT1, VT2 were opened by anti-phase signals from the outputs of the trigger DD2, a through current would flow through the transistors at the moment of switching, and a short circuit of the power source would occur. To eliminate this phenomenon, negative polarity pulses (see Fig. 4.70) are formed so that transient processes in transistors occur alternately and do not coincide in time.

Chokeless voltage converter, 10-15/15-27 volts 3,5 amps

At the moment of opening VT2, C4 is charged through the diode VD1 to the supply voltage. After VT1 opens, C4 will be connected in series with the power circuit. In this case, VD1 will prevent C4 from interacting with the power supply in a parallel circuit, and C5 will be charged through the VD2 diode by the power supply voltage added to the voltage on the charged capacitance C4. The output voltage of the converter depends to some extent on the input voltage and load current.

The operability of the circuit is maintained when the supply voltage is reduced to +5...6 V (after doubling this voltage becomes equal to +10...+ 12 V, which allows the converter to be used also to power twelve-volt equipment from small-sized batteries).

Author: Semyan A.P.

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