Precision and power resistors are used in the fields of drive technology, energy measurement, medical technology and especially in the field of measurement and control technology.
Current measurement in frequency inverters is usually done with low resistance current measuring resistors (shunts) at low power. The current measurement with shunts is either done directly in the IGBT module (integrated current measurement) or with a discrete configuration outside of the module. For larger inverters (currents much larger tan 150 amps), pure shunt modules can also be used.
The requirements for using a resistor are quite varied in the field of power modules:
- High load resilience with a small design
- Very low temperature dependence across a large temperature range (lower temperature coefficient) by choosing the right material.
- High long-term stability
- Suitable design for assembly on DCB ceramic substrate
- Low inductance
- Low thermal stress
The current measurement can be performed in the engine phase, in the low-side of the MosFET half-bridge or in the low-side of all MosFET half bridges (one-shunt solution).
Low-resistance precision resistors in the range from 200 to 500 µohm are used in electronic energy meters today. One of the main requirements here is surely a very low drift across the life time. This is ensured by selecting the appropriate material and pre-treating the components during production at Isabellenhütte.
Due to the high quality and reliability of the precision resistors, these are also used in the field of MRTs, CT scanners and respiratory devices.
Measurement and Regulation Technology
Use of wired components for applications in the field of measurement and control technology. The heating of the components must be kept very low due to the very high requirement for the accuracy of the components. These resistors therefore offer the possibility of mounting on heat sinks to ensure the best-possible heat dissipation.
This is supported by the special sandwich structure of the ISA-PLAN® technology for Isabellenhütte components. An internal thermal resistance of sometimes <0.1 K/W can be achieved here.
Components with a temperature coefficient of 1 ppm/K and higher can be offered by choosing the appropriate resistance material and the corresponding design.
Use in measuring equipment, power supplies, constant power sources, calibration equipment, etc.
The company Isabellenhütte has a Dakks calibration laboratory and can thus also offer corresponding calibration with a calibration certificate if desired.