High voltage converter, 20-50/8000-16000 volts. Scheme, description

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High voltage converter, 20-50/8000-16000 volts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

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High-voltage converters are widely used in modern equipment, but the most time-consuming element of such converters is a high-voltage transformer, the output winding of which must contain several thousand turns. Due to the high potentials between the turns and layers of this winding, the requirements for insulation and workmanship of the coils of such transformers are very stringent. In the regulated high-voltage converter described below with an output voltage of 8 ... 16 kV, a standard high-voltage transformer is used with minor alterations, which is used in the horizontal scanning unit of TVs.

The device (Fig. 4.31) consists of a master oscillator with self-excitation, a power amplifier and a rectifier. The master oscillator (transistor V8) is a blocking oscillator (pulse duration - about 200 μs, repetition frequency - 1 kHz). The generator is powered by a parametric stabilizer R3, R4, V6. From the output winding of the transformer T2, the signal is fed to the power amplifier, assembled on the transistor V1. The winding II of the high-voltage transformer T1 is included in the collector circuit of the transistor.

The high-voltage winding I of the transformer feeds the rectifier - a voltage doubler. Resistors R1 and R2 limit the load current pulse when the converter is turned on, if it has a capacitive character. The output voltage is regulated by changing the supply voltage. Transformer T1 - TVS-POLA. The anode winding is cut from it (without disassembling the magnetic circuit), and a new winding is wound in its place, consisting of 18 turns of PEV-2-0,44 wire with a tap from the 14th turn. The high voltage winding is left unchanged. Transformer T2 is wound on a ring of size K20x12x6 made of M2000NM1 ferrite. Collector winding III and feedback winding II are wound first. They contain 25, and the output winding 1-15 turns of PEV-2-0,44 wire.

The printed circuit board of the converter is shown in Figure 4.32.

High voltage converter, 20-50/8000-16000 volts

The use of a sufficiently powerful transistor as VI made it possible to install it directly on the board without a heatsink. To eliminate the possibility of corona discharges, the parts of the high-voltage rectifier must be soldered to the board very carefully, without burrs and sharp corners, and filled on both sides of the board with epoxy resin or paraffin with a layer of 2 ... 3 mm. Resistors R1 and R2 are best used type KEV.

If the load capacitance does not exceed a few hundred picofarads, these resistors can be omitted. Capacitor C1 - POV (or K15-4, KVI). The gap between the board and the metal walls of the converter case must be at least 20 mm. The adjustment of the converter is reduced to the selection of the resistor R6 within 0 ... 20 Ohm according to the best stability of the master oscillator and the selection of the capacitor C2 at the maximum voltage at the output of the device according to the minimum current.

Author: Semyan A.P.

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