Transformerless voltage converter 12/22 volts 30 milliamps. Scheme, description

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Transformerless voltage converter 12/22 volts 30 milliamps. 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 voltage converter, the circuit of which is shown in Figure 1, with error-free installation does not require adjustment and does not need a separate power source. When the converter is powered from a 12 V DC source, its output voltage at a load current of 30 mA will be about 22 V (ripple voltage - 18 mV). At a load current of 100 mA, the output voltage decreases to 21 V, and at 250 mA - to 19,5 V. Without load, the converter consumes a current of no more than 2 mA from the power source. The device is formed by a master oscillator assembled on logic elements D01.1 and DD1.2, buffer stages DD1.3, DD1.4, transistor switches VT1, VT2 and a rectifier - voltage doubler on diodes VD1, VD2 with capacitors C2, C3. The parts of the converter are mounted on a printed circuit board, the drawing of which is shown in Figure 2. Two wires are brought out to connect the device to the vehicle's on-board network.

Transformerless voltage converter 12/22 volts 30 milliamps

Transistors VT1 and VT2 of the converter can be any of the series indicated in the diagram, as well as GT402V or GT402G, GT404V or GT404G. With germanium transistors, the output voltage of the converter will be approximately 1 V higher. Diodes VD1 - VD3 can be any other, designed for a current of more than 30 mA.

Publication: cxem.net

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