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High Voltage Converter Circuit

Konusu 'Elektronik Devreler' forumundadır ve uydudoktoru tarafından 28 Mayıs 2011 başlatılmıştır.

  1. uydudoktoru

    uydudoktoru Tanınmış Üye Yönetici Yönetici

    13 Haziran 2009
    Ödül Puanları:
    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

    Version 1 and 2 of the voltage converter


    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

    Ekli Dosyalar:


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