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high voltage converter circuit schematic

High Voltage Converter Circuit

Starting from a 30 volt power supply this high voltage converter circuit can deliver a voltage between 0 to 3 kV (version 1) or from 0 to 10 kV (version 2).
IC 4011 gates N1 … N3 are connected as astable multivibrator that commands the Darlington T1/T2 with an rectangular impulse of 20 kHz.

The transistors cannot be brought to saturation because of the low current that goes through them which will result in a very short block period. The rapid blocking of the transistors will produse an impulse of almost 300 V in the transformer’s T1 primary winding. This voltage is multiplied by the numbers of turns from the secondary winding.

For the first version it uses a monophased rectification. The second one uses a cascade rectifier from an old TV set and it delivers a 3 times higher voltage.

3 kV/10 kV High-Voltage Converter Schematic

high voltage converter circuit schematic

Version 1 and 2 of the voltage converter

3kv and 10kv voltage converter version 1 and 2

IC2 LF355 regulates the output voltage by comparing the P1’s voltage with that from the common point of the voltage divider R6/R8 or R7/R8. If the output outreaches the established voltage level, IC2 will reduce the supply voltage from the output through T3.

The most important part of the high voltage converter is the transformer. You may use a variety of cores E, E+I or ferrite with 30 mm diameter. The core must not have any air gap and a value for Al of 2000 nH is pretty good. The primary winding consists of 25 turns of 0.7 … 1 mm enamelled copper and the secondary winding consists of 500 turns of 0.2 … 0.3 mm conductor. Both of the windings must have very good insulation from each other.

Regarding this high voltage converter, please remember:

  • capacitor C6 must support a voltage of at least 3 kV
  • R6 at version 1 is made of six 10 MΩ resistors in series. R7 is made of six 50 MΩ resistors in series. This is done in order to eliminate the voltage spikes.

Each circuit consumes avout 50 mA without the load and 350 mA with a 2 … 3 W load. T2 and T3 transistors need good heatsinks.

Components list of the high voltage converter
R1 = 4.7K
R2 = R5 = 1K
R3 = 330
R4 = 2.7K
R6 = 60M
R7 = 300M
P1 = 500K

C1 = 10n
C2 = C4 = C5 = 100n
C3 = 1000µF
C6 = 10n / 3kV
C7 …. C12 = from tv module TVK 32

D1 = Zener 11V
D2 = D3 = BY127
D4 …. D9 = from tv module TVK 32

T1 = 2N3055
T2 = BF259
T3 = BU208

Tr1 = read the article

IC1 = 4011
IC2 = LF355

4 Comments

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  • David Rivkin

    Any suggestions on how to go in the other direction?
    Start with 115KV and get out, say 880V?

  • Viktor

    Thank you. I plan to use it in WDS spectrometer.

  • Col. Dana Gillespie

    Finally someone who understands that 24v isn’t Hi-Voltage. I get so damn tired of looking for parts and schematics of circuits for HI-Voltage and I find one and it’s 24 VDC. After thirty years in Electronics and a master Industrial Electrician 24VDC is what we used to power the CMOS in the instruments we calibrated. I build power supplies, not little motor car toy power supplies. 100Amp is good. 450VDC is good. 4f capacitance is good. I will borrow part of your schematic if it’s ok. I’ve already got the voltage Multipliers from the old TVs. Another good source of high voltage is Microwave oven (old ones) transformers. They will arch to you as you probably already know. Buck them and there’s really no limit. I’ve got my neighbor trained, if his lights dim he goes out side to estimate the height of the mushroom cloud~just in case.
    Thanks for the post!

  • Gigasquid

    What are the end-uses for such a device?

    Kind regards.

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