What You Need to Know about Power Resistors


Today, demand for emission of lower carbon IV oxide has become a global trend. Again, smart electrification of automobiles and electricity supply grid are focused on more efficient electronic circuits. Because of this, it is important for system operators and circuit designers to understand the level of current flowing through the circuit as well as the one delivered to a load. The use of current sense resistors and wirewound resistors are essential for circuit designers and system operators.

There are, however, various applications that would benefit from accurate current measurements. Some of these applications include maximizing the battery operating performance, motor speed control, and hot swapping server units. The use of current sense resistors offers an optimal and a cheaper solution for efficient circuit designs in a variety of applications.

Basically, power resistors are made such that they dissipate and withstand high amounts of power. Generally, they are usually made from high thermally conductive materials for efficient cooling. They are coupled with heat sinks to dissipate high amounts of power. For some power resistors, forced liquid or air may be needed when under maximum load.

While some power resistors are wire wound or wire grid to ease cooling, there is something common with power resistors. The common thing is that they are designed and built to dissipate power. Such power is produced during engine braking for vehicles that use electric motors. However, power resistors are of different types and they are used for different purposes.

One type of power resistors is the current sense resistors. This type is popular for their cost-effectiveness yet they improve the efficiency of the systems and minimize losses. This is because they have high measurement accuracy than other technologies. Although they can be used in a variety of applications, they are particularly useful for developers for measuring current in industrial, automotive, as well as computer electronics.

The current sense high power resistors detect and convert current to voltage. Their features are usually low resistance value which only causes an insignificant voltage drop in the application. To choose the ideal current sense resistor for a certain application, you need to check the specification of input common-mode voltage.

Another type of power resistor is the wirewound resistor. They are electrical passive components designed to limit current. The resistive element exists due to an insulated metallic wire winded around the core of a non-conductive material. That material is usually highly restrictive. They offer accurate and excellent properties for high power ratings and low resistance values

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