How many ways are there to connect shunt resistors? Detailed explanation of common wiring methods of shunt resistors

In electronic circuit design and measurement, shuntingresistanceIt is an important device, mainly used to measure current. The correct wiring method is not only related to the accuracy of measurement, but also affects the safety and stability of the circuit. So, how many ways are there to connect the shunt resistor? This article will introduce in detail the common wiring methods of shunt resistors from multiple angles to help you better understand and apply shunt resistors.

1. Overview of shunt resistor

Shunt resistor, also known asshunt, is a low-resistance, high-precision resistor that is usually connected in parallel in a circuit, and the current flowing through it is calculated by measuring the voltage drop across it. Because its resistance is extremely small and will not have a major impact on the circuit, it is widely used in current detection, power management and other fields. The choice of wiring method directly affects the measurement accuracy of the shunt resistance and the overall performance of the circuit.

2. How many ways are there to connect the shunt resistor?

According to different application environments and measurement requirements, the wiring methods of shunt resistors mainly include the following:

1. Series wiring method

This is the most basic wiring method, connecting the shunt resistor directly in series with the current path of the circuit. A voltage drop occurs when current flows through the shunt resistor, and the current value can be calculated by measuring the voltage drop. This method has a simple structure and is suitable for most DC current measurement scenarios.

2. Parallel wiring method

The shunt resistor is connected in parallel at both ends of the load and is mainly used for voltage dividing or protection circuits. Although it is rarely used for current measurement, in some special scenarios, the current detection function can also be achieved through parallel connection.

3. Single-ended measurement wiring

Single-ended measurement means measuring the voltage at only one end of the shunt resistor, grounded relative to ground. This method has simple wiring, but is easily affected by ground potential changes and has large measurement errors, so it is suitable for non-precision measurements.

4. Differential measurement wiring

The differential measurement method simultaneously measures the voltage difference at both ends of the shunt resistor, which can effectively offset common mode interference and ground potential changes and improve measurement accuracy. This method is commonly used in high-precision current sensing systems.

5. High-side wiring method

High-side wiring means installing the shunt resistor on the positive side of the power supply. The advantage is that it can monitor the entire current path of the load when measuring current, and it is highly safe and suitable for battery management and power monitoring.

6. Low-side wiring method

The low-side wiring is to connect the shunt resistor to the ground side of the load, which has a simple structure and low cost. However, the disadvantage is that it may introduce ground potential deviation, affecting the measurement accuracy.

7. Four-wire measurement wiring method (Kelvin wiring)

The four-wire measurement method uses two wires for power supply and the other two wires for measuring voltage, which can eliminate the influence of lead resistance and greatly improve measurement accuracy. This method is commonly used in high-precision experiments and industrial measurements.

8. Multi-point shunt wiring

In complex circuits, multiple shunt resistors may be needed to measure currents in different paths. Through multi-point shunt wiring, comprehensive current monitoring of the entire system can be achieved.

three,

There are various wiring methods for shunt resistors, including series wiring, parallel wiring, single-ended measurement, differential measurement, high-side wiring, low-side wiring, four-wire measurement and multi-point shunt wiring. Different wiring methods are suitable for different measurement accuracy and application scenarios. Choosing the appropriate wiring method can not only ensure the accuracy of measurement, but also improve the safety and stability of the circuit. It is crucial for electronic engineers and technicians to understand and master the wiring methods of these shunt resistors.

I hope this article will help you understand the wiring methods of shunt resistors and help your circuit design and measurement work to be smoother and more accurate.