Transformerless voltage converter, 28/150-450 volts 1 watt. Scheme, description

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Transformerless voltage converter, 28/150-450 volts 1 watt. 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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On fig. 4.30 is a schematic diagram of a simple voltage converter used to power gas discharge indicators in a digital measuring instrument. With it, you can get an output voltage in the range of 150 ... 450 V at a power of about 1 watt.

The efficiency of the converter is approximately 75%.

Transformerless voltage converter, 28/150-450 volts 1 watt

The device works as follows. When the transistor is turned on under the action of clock pulses applied to its base, energy is stored in the inductor in the form of a magnetic field.

When the transistor is closed, a voltage pulse appears on the collector, proportional to the current decay rate in the coil, which is transmitted through the VD1 diode to the capacitor C2. With a clock frequency of 1 kHz, the output voltage is 250 V (input voltage 28 V). Coil inductance - 600 uH. In the voltage converter, you can use the transistor 2T704B. Capacitor C2 must have a very small leakage current. Diode VD1 must withstand a reverse voltage of at least 600 V. Clock pulses come from the device's crystal oscillator through a separate inverter.

Author: Semyan A.P.

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Comments on the article:

Anatoliy_de

Thanks to the author for an interesting circuit solution to the problem of the converter. But it would be even better if he gave the dimensions of the L1 coil and the requirements for the breakdown voltage of the transistor.

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