Series HCH from 650V to 300kV / 20kW to 50kW


  • efficiency up to 90%
  • short-circuit & flashover proof
  • in units up to 20kV nominal voltage, the HV-components are isolated in air; from 35kV on the isolation is with oil
  • unlimited operation with rated current in a short-circuit condition
  • unlimited operation with rated power
  • voltage and current regulation with automatic sharp transition, control modes indicated by LEDs
  • limitation of inrush current on switching on
  • voltage and current setting by means of 10-turn potentiometers with precision scale; the adjusting knob can be locked
  • interlock loop to monitor the external load and internal loop as a standard


In principle, the rectified line voltage drives a square wave generator of fixed frequency, whose AC voltage is transformed, rectified and filtered, producing the output voltage. For regulation, the square wave voltage is pulse width modulated.


  • Depending on Voltage and Power the units are built as single or double 19" cabinets, or as a oil-filled HV container with the power electronics on the top or in a separate rack.


Output isolation The required output polarity must be stated with the order. The requested output polarity will then be available at the HV connector and the “0V” terminal will be firmly connected to earth. If required, the "0V" terminal can be made floating against earth up to ±50V. A polarity reversal switch is optionally available.
Output terminals All output terminals are located at the rear side of the cabinet or at the top of the HV container. High voltage connectors with the appropriate dielectric strength are delivered with the power supply for units with output current up to 10A. For units with higher output currents, the output will be carried out according to your wishes so that your load can be optimally connected.
For nominal voltage of 65kV and higher the HV-plug will be delivered ready mounted to 10m cable.

Technical Data:

Mains connection ≤ 1400W: 230V ±10% 47Hz to 63Hz
≥ 2800W: 400V ±10% 47Hz to 63Hz, three-phase
Ambient temperature 0°C to +40°C

The following data applies for voltage and current regulation, and refers to the rated value, unless otherwise stated. (For explanations please refer to Terms and Definitions)

Setting range from approx. 0,1% to 100%
Setting resolution ±1 x 10-4
Residual ripple (0-10MHz) < 2 x 10-3pp + 50mVpp
Recovery time

voltage control:
< 1ms for load changes from 10% to 100% or from 100% to 10%

current control:
< 10ms for load changes causing an output change of less than 10% of the rated voltage

Setting time at nominal load < 500ms for changes of the output voltage from 10% to 90% or 90% to 10%
Discharge time constant
for output without load
approx. 1sec. to 10sec., depending on type

for ±10% mains voltage variation:
< ±1 x 10-4

for no load / full load:
< 5 x 10-4

over 8 hours under constant conditions:
< ±2 x 10-4

within the temperature range:
< ±1,5 x 10-4 / K


Analogue programming All FuG power supplies are optionally available with an analog programming 0-10V (Standard with the series HCE and HCN 7E). This option is also available as retrofit set.
Computer interface IEEE 488, RS 232, RS 422, Profibus DP, USB, LAN (more on request)
Higher stability Voltage and/or current regulation with better long-term stability and lower temperature coefficient.
Lower ripple On several series a lower ripple can be achieved by better smoothing. This option can be supplied only with new units. A later modification is not possible. For an order with this option applies.
Polarity reversal By this switch the polarity of the output voltage of a high voltage power supply (Nearly all of the HCP, HCL, HCN, HCK, HYN) can be changed.