Economical voltage converter for powering varicaps, 6-9/20 volts. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Economical voltage converter for powering varicaps, 6-9/20 volts. 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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When using varicaps in portable receivers powered by 6 ... 9 V sources, there is a need for a converter that steps up the voltage to about 20 V. Most of the voltage converters described on the pages of amateur radio magazines are not very suitable for use in portable receivers, since they require the use of step-up transformers and Zener diodes D814 with a minimum stabilization current of 3 mA, which complicates their manufacture and reduces efficiency.

These shortcomings are not present in the converter, the circuit of which is shown in fig. 4.13. It does not contain winding parts, is economical and easy to set up. The converter consists of a rectangular pulse generator on a DD1 chip, a voltage multiplier on diodes VD1 ... VD6 and capacitors C3 ... C8, a parametric voltage regulator on transistors VT1 ... VT3.

Economical voltage converter for powering varicaps, 6-9/20 volts

The emitter junctions of transistors are used as zener diodes. The stabilization mode occurs at a current of 5 ... 10 μA. In addition to those indicated in the diagram, the converter can use K176LE5 and K176LA9 microcircuits, KT315, KT316 transistors with any letter index, D9A, D9V, D9Zh diodes. Capacitors C1 ... C7 - KLS or KM, C8 - K50-6 or K50-3, MLT or VS resistors. The adjustment of the converter is reduced to the selection of transistors VT1 ... VT3 with the required stabilization voltage.

When the receiver supply voltage changes from 6,5 to 9 V, the current consumed by the converter increases from 0,8 to 2,2 mA, and the output voltage increases by no more than 8...10 mV. If necessary, the output voltage of the converter can be increased by increasing the number of voltage multiplier links and the number of transistors in the stabilizer.

Author: Semyan A.P.

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