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High-voltage power supplies Print E-mail

High-voltage power supplies

Voltages up to 300,000V (300kV)
Outputs up to 400,000W (400kW)

The mains voltage (230V / 3 x 400V) is transformed, rectified and filtered by the HN series. The direct current output voltage is tuned by a variable transformer or regulated by a thyristor controller. With the HS and HV series the rectified mains voltage is supplied to a frequency converter, which produces a mid-frequency square wave voltage. This transformed, rectified and filtered alternating current produces the desired voltage as output, which is regulated by means of frequency variation or pulse width modulation. The equipment in the HV series supply, in addition to the high voltage output, up to 3 auxiliary outputs which can be used to supply e.g. heating, grid voltage or  surge voltage.

Construction types
For high voltage components involving up to around 60kV / 2kW, dry construction is possible (air or sealant isolation). Above 60kV and higher power, these components are installed in a high-voltage tank, whose PCB-free transformer oil filling serves to cool and isolate. The power electronics and the oil tank are usually cooled by water. Air cooling is possible in certain cases. The control and power electronics are kept in a separate switch box.  External control is by means of PLC or Profibus systems. The M-Power-Line series uses microcontrollers.

The main applications are in the field of electron beam generation. This involves electrons being emitted from a cathode of an electron beam generator, accelerated and then focussed on a target by means of specially generated electric fields. Our high-voltage power supplies supply the electrical energy required for the emission of the electrons, the heating current to bring the cathode up to, and maintain it at, operational temperature and the Wehnelt voltage (named after Arthur Wehnelt; also known as the grid voltage) which is supplied to the corresponding electrode and affects the strength of the electron cloud by means of the lines of electric flux.
The emitted electrons can be accelerated in a vacuum to up to around 2/3 the speed of light. The energy taken up in this process is sufficient to melt or vaporise matter.