High Precision Power Sampling Resistor

Power sampling resistors are commonly used in power electronics applications to provide precise current measurement and control. These resistors are responsible for sampling the electrical power at a specific location within an electronic circuit and converting it into a measurable signal.

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Description

High-Precision Power Sampling Resistors

High-precision power sampling resistors are designed to provide an even higher level of accuracy and reliability in power electronics applications. They are typically constructed using specialized materials, such as high-temperature alloys or ceramic-based composites, and are manufactured to extremely tight tolerances.

One of the key advantages of high-precision power sampling resistors is their ability to accurately measure the current flowing through a circuit without adding any significant resistance. This is achieved through the use of a low-ohm design, which allows for minimal voltage drop across the resistor.

High-precision power sampling resistors are used in a variety of applications, including motor control, power supplies, and battery charging systems. They are particularly useful in high-power applications where accurate current measurement and control is critical to ensure optimal performance and safety.

In addition to their high-precision performance, high-quality power sampling resistors are also designed to withstand high temperatures, high voltages, and harsh operating conditions. They are manufactured using advanced techniques and materials, such as laser trimming, thick-film printing, and ceramic substrates, to ensure reliable and consistent performance over a long service life.

In summary, high-precision power sampling resistors are an essential component in many power electronics applications. Their ability to provide accurate current measurement and control, as well as their high-quality construction, make them an ideal choice for demanding industrial and commercial applications. When it comes to selecting the right power sampling resistor for your application, it is important to choose a high-quality, reliable supplier with a proven track record of delivering high-precision components.

Equivalent to the ISA AH-E RNG4617

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Characteristic

● Rated power is up to 50W

● Resistance value precision is 0.01%

● Temperature coefficient is ± 2ppm / K

● Very low sense of resistance

● Load stability of 0.02%

Table 1-Parameters
Mode		RNG4617
Stopped value interval		From 0.005 to 1000Ω
power rating	The heat sink is not installed70℃	3w
	Add radiator	50w
accuracy		1%/ 0.1%/ 0.25%/ 0.5%/ 0.01%/ 0.02%/ 0.05%
Thermal resistance		1.6KW
stability (2000h)		0.02%/ 0.1%/ 0.2%/ 0.5% (It also depends on the pressure size)
temperature coefficient		±10ppm/K (20 to 60℃) ±5ppm/K (20 to 60℃) ±2ppm/K (20 to 60℃)
Pressure resistance value		500VDC
Maximum current		50A
Thermoelectric potential		<1μV/K
Operating temperature interval		-40 to 130℃
Resistance material		Manganese copper, nichrome foil
placode		Aluminium oxide
Protective layer		Epoxy resin
Electrode material		Tinned copper
Pin count		4
Maximum torque		1Nm

Table 2-Temperature coefficient

Figure 3-The reduced power curve

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Rated Power Note-

RNG4617 Series resistance connected to a suitable radiator for use.

The maximum internal temperature is 130°C. Using the following formula:

Where: RθH= thermal resistance of the radiator (K / W)

RθR = electric resistance of thermal resistance (K / W)

TMAx = maximum resistance maximum working temperature

TA = Ambient temperature of radiator (℃)

P = power of resistor (W)

Table 4-4 Line connection

For low resistance resistance (less than 10 Ω), the increase in the resistance and temperature coefficient of the copper pin exceeds the resistance itself. A four-legged Kelvin connection is recommended, as shown in the figure below.

The load current on the V-pin will cause a measurement error.