Voltage converter, 12-30 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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In modern amateur radio designs with universal power supply (mains and battery), the supply voltage usually does not exceed 12 V. Meanwhile, for some electronic devices used in such devices (for example, vacuum fluorescent indicators), the operating voltage is somewhat higher - up to 30 V. For the efficient use of many types of varicaps, it is also desirable to apply control voltages up to 20 ... 30 V to them. Such voltages can be obtained in designs with low-voltage power supply using a voltage converter.
A diagram of one of the options for such a converter is shown in the figure. To receive high-voltage pulses, it uses a storage choke. A pulse generator with a repetition frequency of about 1 kHz is assembled on the DA40 timer (it is determined by the resistance of resistors R1, R2 and the capacitance of capacitor C1). These pulses are fed to the transistor VT1, operating in the switching mode. When it is open, energy is stored in the inductor L1 due to the current flowing through VT1. When the transistor closes, a voltage pulse appears on coil L1, the amplitude of which is several times higher than the supply voltage (in the author's design it was about 80 V). These voltage pulses are rectified by the VD1 diode, and the rectified voltage is filtered and then stabilized by the Zener diode VD2.
Transistor VT1 is desirable to choose from among those intended for use in switching circuits. In particular, it must have a high allowable collector-emitter voltage (not lower than 100 V). Diode VD1 should also have a high reverse allowable voltage. Zener diode VD2 - low power for the required output voltage (in the author's design - 30 V). The DA1 timer has an analogue of domestic production - KR1006VI1. There is no detailed information about the inductor in the article. It is only noted that it is made on an open armored magnetic core made of a material with a high initial magnetic permeability with a wire with a diameter of 0,1 mm.
When establishing a design, it may be necessary to select a resistor R3 - according to the highest rectified voltage (on capacitor C4).
Author: HAWKER R.
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