BVF Precision Resistor - The Smallest of its Kind in Composite Technology

With the BVF, Isabellenhütte Heusler GmbH and Co. KG has developed a precision resistor that not only impresses with its unique overall size 1213 (3.1 mm x 3.3 mm), but also with its extremely high load capacity and precision in use. Smaller electrically-operated applications in particular benefit from the properties of the high-performance component that Isabellenhütte has now included in its series repertoire.

With its small overall size, the BVF is currently unique on the market. The temperature coefficient of the BVF precision resistor is just under 70 ppm/K. The thermal resistance is also extremely low at 10 K/W. This results in the high load capacity of the BVF of 3 watts at up to a temperature of 145°C at the contact point.  Due to the sturdy design in the proven ISA-WELD® technology, the component is suitable for a temperature range from -65°C to +175°C and is therefore above the current required limits for typical automotive applications.

The BVF delivers the precise measurement results with an overall size of just 3.3 mm x 3.1 mm - even under a high temperature load

Optimal Results Thanks to the Unique Composite Technology

The application of the ISA-WELD® procedure developed by Isabellenhütte in conjunction with the material NOVENTIN® allows for maximum design flexibility, resulting in the small overall size and the stepped shape of the BVF.

The resistance alloy NOVENTIN® newly developed by Isabellenhütte ensures that the sophisticated BVF is stable on the one hand and still delivers accurate measurement results on the other hand, even after 2,000 hours with only slight deviations of less than 1.0% at a contact point temperature of 145°C. The resistance material NOVENTIN® is characterized by a particularly low temperature coefficient between +20°C and +60°C with a parabolic shape of the R(T) curve. The material has a high long-term stability of the electric resistor, extremely low thermoelectric power against copper and is easy to process. The material properties also allowed for freedom in the geometric design of the BVF. This is how a resistance value of 1 mOhm or 1.5 mOhm is achieved. The combination of the small overall size with the simultaneously high performance capability with very good stability values across the entire temperature range is currently unique on the international market.

The BVF provides accurate measurement results, even when used in a high-temperature environment

Wide Range of Application Areas

The BVF is qualified according to AEC-Q200 and can be used in all automotive applications. Isabellenhütte offers the BVF, for example, for use in electric vehicles and electric scooters, but also for applications in air conditioning systems or washing machines. In general, the BVF can be used in all applications where brushless DC motors are operated. The BVF shunt sits in a module that controls such a BLDC motor. The shunt is built into power modules that control these motors. The energy efficiency of devices is becoming increasingly important. An air conditioning system, for example, can be controlled more precisely and ensure appropriate cooling, even with less power consumption. The required torque of a washing machine can be appropriately dynamically adapted to the load during the slow washing process.

Technical Details about BVF


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