Current sensing resistor, including shunt resistor, is very popular for their high power, low resistance and low inductance. It is conducive to control the noise for high frequency and high speed application. And because of the inverted structure and long edge, the power dissipation ability is improved.


 
The rated power of the current sensing resistor indicates the maximum energy that the resistor can consume without damage or degradation. Most manufacturers say their free air flow is rated at 70 °C. Above this temperature, the stress on the resistive material decreases. It also indicates that power consumption must be reduced to a temperature of 0.
 

According to the copper nickel alloy or MnCu alloys used, the power drop curve shows a higher reduction point. This is due to the unique structure of the element and is usually due to the fact that the current detection resistance series can be used for the same rated power of higher rated power or smaller housing size than many other components.
                     
 
This reliable current measurement method can be found in automotive applications, but also in home appliance technology. This kind of current sensing resistor can be found in the trunk cover control or seat adjustment; the valve regulator or brake system also requires accurate current measurement. Manufacturers of cleaning robots, such as cleaning robots used in residential areas, can use resistors to solve three problems at a time. The DC / DC converter of the robot power supply requires a 10m Ω shunt with a power loss of at least 2 W, as the current above 10 A should be measured and the controller needs an input voltage of at least 100 mV. Normally for 2W heat dissipation, size 2512 shunt is required, but due to limited space, it is not suitable.