Current Sense Resistor Manufacturer

 

 

Among the most common approaches to measuring current in electronic equipment is to use a discrete sense resistor and an isolation amplifier. This is done because a current sense resistor has a low resistance value and can minimize power loss. Moreover, it is important to ensure that the voltage across the resistors is sufficient to measure the current accurately. This means that the voltage drop across the resistors must be measured and subtracted from the voltage that reaches the load. This allows the sensor circuit to measure the current in real-time.

 

Typical resistance values for current sense resistors are measured in milliohms. Power ratings for these resistors range from fractions of a watt to tens of watts. These resistors are designed to minimize power loss and maximize the performance of the electronic device.

 

Typical applications of current sense resistors include measuring current in a power supply, snubbers, and monitoring purposes. They are also useful in mitigating the effects of short circuits. The resistor is generally positioned between the supply rail and the load. The design of the PCB tracks around the resistor is also important.

 

The resistance element of a current sense resistor is typically a metal plate or foil. Metal technology allows for improved resistance element performance. It also allows for better surge performance and lowers TCR. In addition, it can be scaled to produce large off-PCB shunts. However, high-temperature dissipation can require consideration of thermoelectric voltages. In addition, a high-resistance value generates a large voltage drop and heat. This can limit the accuracy of the measurement and upset closed-loop control.

 

The resistance element can also be manufactured as a thick film on ceramic for lower resistance ranges. This reduces temperature rise and maintains a small change in resistance value when the temperature changes. The temperature coefficient is also reduced to improve the accuracy of the measurement.

 

Depending on the application, current sense resistor products are available in different shapes and sizes. These are manufactured to the same working principles as standard electrical resistors. They can be inserted in a series between the supply rail and the load. Generally, they are engineered to have an extremely low resistance value. This results in low power consumption and minimizes the risk of short circuits. They are also RoHS compliant. They are also available in different package sizes.

 

Current sense resistors are also manufactured as free-air devices. These resistors are ideal for applications in virtually any market segment. They are also very cost-effective and have high measurement accuracy. In addition, they are produced as low-power surface mount devices. They are available in different sizes, shapes, and constructions. These resistors are ideal for applications in power supply, monitoring, and consumer designs.

 

When choosing a current sense resistor, the most important metric is the voltage drop across the resistor. This is because the voltage drop represents a wasted amount of power. It is also important to avoid the use of a copper trace in the sensed current path because this introduces unnecessary temperature sensitivity.

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