Voltage doubling converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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In amateur radio designs, there is often a need for several supply voltages, while the power supply produces only one, and reworking it is quite complicated.
At low consumption currents, various voltage converters (multipliers) can be used. Many of them are complex and require expensive components.
Compact and convenient pulse voltage converters. I propose my version of such a converter based on a simple and very popular type 555 timer integrated circuit (domestic analogue - KR1006VI1). The converter allows you to get two voltages from +5 V: +10 V and -5 V.
From the output (pin 3) DA1, operating in multivibrator mode, the pulses are sent to two rectifiers with voltage doubling. The first of them (on diodes VD2, VD3 and capacitor C6) provides an output voltage of -10 V relative to the power supply (+5 V), which is equivalent to a voltage of -5 V relative to the common wire.
The second rectifier (on diodes VD1, VD4 and capacitor C7) produces a voltage of +10 V relative to the common wire. The frequency of the pulses generated by DA1 is about 60 Hz and is regulated by the potentiometer PR in the range of 50...60 Hz.
The frequency of the generator, in principle, is not critical and can be changed up to a high one - on the order of several tens of kilohertz. To do this, you should use the recommendations for the use of IC 555.
When the converter is supplied with a voltage of a different value, for example, +15 V, voltages of -15 and +30 V are obtained at the outputs of the converter.
As diodes VD1. VD4 in the circuit used KD522 Instead, 1 N4148 will successfully fit. The timer chip can be used from any series (NE555, LM555). Capacitors C4 ... C7 must withstand a voltage not less than the output (in a 5-volt converter -15 V, in a 15-volt converter - 50 V).
Author: P. Bobonich, Uzhhorod, Ukraine
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