Adjustable high voltage converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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More intense than 16 kV is sometimes necessary for experiments, powering cathode ray tubes, etc.
Converter of low-voltage (20-50V) voltage to high-voltage (8-16kV) consists of a master oscillator with self-excitation, a power amplifier and a rectifier. The master oscillator is assembled on a V8 transistor according to the blocking oscillator circuit. From the output winding I of the transformer T2, the signal is fed to the power amplifier (transistor V1), the load of which is the transformer T1. High voltage is removed from winding I of this transformer and fed to a rectifier with voltage doubling (V2, V3, V4, V5). When the rectifier is turned on for a capacitive load, resistors R1 and R2 limit the high voltage pulse.
The output voltage is regulated by changing the supply voltage.
The high-voltage transformer T1 is made from the TVS-110LA output line transformer. You can use any other from modern or old TVs by removing the anode winding from it without disassembling the core. Instead of this winding, a new one is wound, 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 K20 x 12X6 ring magnetic circuit made of M2000NM1 ferrite. Collector winding III and feedback winding II are wound first. They contain 25 each, and the output winding I - 15 turns of PEV-2 wire - 0,44.
To prevent the possibility of corona discharges, the elements must be soldered very carefully during installation, without sharp corners, and filled with epoxy with a layer of 2 mm. In extreme cases, paraffin can be used instead of epoxy.
Resistors R1 and R2 - type KEV, capacitor C1 - POV or KVI, K15-4. The gap between the board on which the converter is assembled and the walls of the case must be at least 20 mm.
The adjustment of the converter is reduced to the selection of the resistor R6 * to obtain stable operation of the master oscillator. Capacitor C1 is selected at the maximum output voltage according to the minimum current of the transistor V1.
See other articles Section Voltage converters, rectifiers, inverters.
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