High voltage power supply
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Modern laboratory power supplies usually have output voltages that do not exceed a few tens of volts. Meanwhile, in amateur radio experiments, there may be a need for a low-power high-voltage voltage source. It is easy to assemble it from improvised means using widely used elements and a conventional step-down ("incandescent") network transformer. (Volker Kindt. Hochspannungsgenerator fur Zahlrohre. - Funkschau. 1981, No. 19, S. 95-96).
A schematic diagram of a power source that provides a stabilized output voltage in the range of 100 ... 700 V at a load current of several tens of microamperes is shown in the figure. It was used to power an experimental Geiger counter design.
An oscillator operating at a frequency of about 1 kHz is assembled on the integral timer DA2,5. Rectangular pulses from the low-resistance output of the timer are fed to the step-up transformer T1. which was used as a network transformer, designed for an output voltage of 6.3 V and a current of 280 mA (winding I) at a mains voltage of 220 V (winding II). On the mains winding of the transformer, the effective value of the alternating voltage will be approximately 100 V. A rectifier with diodes VD2 - VD9 is connected to this winding. made according to the voltage multiplication scheme.
The transistor VT1 has an output voltage stabilizer. It enters the base circuit of the transistor through a divider consisting of resistors R4 - R8 and a trimming resistor R3. As soon as the voltage at the output of the converter exceeds a certain value (it is determined by the position of the trimmer resistor R3). then the transistor VT1 will open and shunt the capacitor SL. This will lead to a breakdown of the generator oscillations (until the required voltage value is restored at the source output).
The VS547V transistor can be replaced with a KT342B, the 555 chip with a KR1006VI1, and the 1N4007 diodes with a KD243Zh.
Author: Volker Kindt
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