Austrian manufacturer of power resistors EBG has developed new material combinations and processing methods to achieve a thermal coefficient of resistance (TCR) of +/- 5 ppm while maintaining the minimal voltage coefficient of resistance (VCR).
Leading-edge capability with resistive inks and sintering
The SHP series is a new generation of high-precision and high-stability resistors that have already been implemented in applications such as medical power supply units. “To produce such ultra-high precision HV resistors requires leading-edge capability in the use of resistive inks in combination with the sintering process,” says Louis Klein of EBG.
From 100MΩ to 250MΩ
The non-inductive SHP series of power resistors currently includes SHP39, SHP52 and SHP78. The series offers a 10kV operating voltage with a tolerance range from ± 1% to ± 0.1%. The ohmic range is from 100MΩ to 250MΩ, though other ranges are possible on request. The overall stability is ± 5ppm/°C from +25°C to +65°C (including TCR and VCR).
“Achieving a stability of 5ppm over temperature including the TCR and VCR is a big deal at 10kV,” says Phil Surman, sales director at PPM Power, “and every resistor comes with stability data collected in 10-degree steps.”
Typical applications for the SHP series include medical power supplies, motor drives and controls, X-rays, converters and energy regeneration.
The next generation promises broader thermal application areas and even higher thermal stability. This is currently in development.
EBG is based in Kirchbach-Zerlach.