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Company background

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1942

  • Egon Graf builds an electric motorbike

1945

  • Company founded by Egon Graf in Ehningen near Böblingen
  • Capacitors for radios
  • AC capacitors for electric motors
  • TESLA transformers

1954

  • Starter capacitors for fluorescent tubes

1955

Development and construction of:
  • High voltage capacitors
  • High voltage generators
  • High voltage transformers
  • High voltage control devices
  • High voltage capacitors for electron microscopes

1965

  • Development and construction of 100 KV tubular electrostatic air filters
  • High voltage transformers for dental X-ray equipment
  • High voltage test instruments for vitality testing in dentistry

1970

  • Development and construction of a magnetotherapy device
  • Portable high voltage generator for an "electric paintbrush"

Since 1983

  • Invention of the integrated cascade
  • Development of HV-Generator NQ 85 with integrated tubular cascade
  • Development of HV-Generator HG 85 with integrated tubular cascade
  • Development of a capacitor combination for Zeiss
  • Development of the HEX-Series with power board

1984

  • Start of mass production of the first small-scale generators with medium frequency technology

1985

  • Business taken over by Harry Graf, the founder's son

1990

  • Modularisation of the HV generator models

1994

  • Development of the stabilized generator series GE 101

1996

  • Development of partial-discharge-free transformers
    • HV-Transformer HT 40
    • HV-Transformer HT 50

2001

  • Development of HV-Generator GE 32 with 20 mA interface

2002

  • Start of mass production of miniaturised high voltage generators for painting robots in the automotive industry
  • Developments since 2002:
    • HV-Generator GE 200 (100 KV/200 W)
    • HV-Generator GE 400 (100 KV/400 W)
    • HV-Generator GE 9P RO2 (100 KV/ 9 W)
    • Power Board R 101-36 ST
    • Power Board R 101-36 DB
    • Power Board R 101-36 X3
    • Power-Multiplication of current by joining two or more generators
    • HV-Switch HUS 101

2009

  • Development of quick switching high voltage switches HDS 90 REE and HUS 90 REE for testing purposes.

2010

  • Development of a measurement device ADOS 100 A to measure rapid voltage changes at high voltage potential for display on an oscillograph

2013

  • Development of multiple generators for higher currents with supply and control boards
 

2019, EGRA

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