FAQs High Voltage Power & Safety

What is a high voltage power supply?

A high voltage power supply is a complex power conversion circuit that converts a lower voltage potential to a higher voltage potential. The term “high voltage” is relative not quantitative, but once voltages are above 62Vdc the possibility for bodily harm are present so appropriate safety measures must be used. Typical output voltages for Spellman’s high voltage power supplies are 1kV to 360kV, but ranges of 62V to 500kV are provided.

High voltage power supplies can operate from DC or AC input voltages. DC input voltages are economical to use in low power applications (1 watt to 125 watts). Typical DC input voltage are +12Vdc and +24Vdc. AC input high voltage power supplies can operate off a variety of input voltages ranging from 100Vac to 480Vac, single phase or three phase depending upon design. Power factor corrected/universal input high voltage power supplies can operate off 90 to 264Vac with no user intervention required.

Spellman’s range of output power spans from less than a watt to over 200 kilowatts. The high voltage power supplies we offer fall into the following categories:

  • Modular High Voltage Power Supply
  • Rack Mount High Voltage Power Supply
  • X-Ray Generator
  • X-Ray Source (Monoblock®)
  • Custom High Voltage Power Supply
  • Application Specific High Voltage Power Supply

The polarity of the DC high voltage power supply must be considered. Units with a fixed positive polarity, fixed negative polarity or reversible polarity are available. Some application specific power supplies can electronically reverse their output polarity with the flip of a switch or remote control signal.

The output of the high voltage power supply is provided to the customer via an appropriately rated high voltage cable. Smaller, economical units utilize a permanently attached high voltage fly wire, while larger units use a detachable shielded coaxial high voltage cable. 

Spellman High Voltage Electronics Corporation is the world's largest independent manufacturer of high voltage power supplies, with usage in a large array of applications in the industrial, medical and scientific communities.