你的位置：Serial Number | Model | Resistance（mΩ) | TCR（ppm/℃) | Accuracy（%） | Encapsulation |
1 | 3921MP12F0M20 | 0.2 | ±200 | ±1 | 3921 |
2 | 3921MP09F0M50 | 0.5 | ±100 | ±1 | 3921 |
3 | 3921MP08FR001 | 1.0 | ±50 | ±1 | 3921 |
4 | 5931MP15F0M10 | 0.1 | ±200 | ±1 | 5931 |
5 | 5931MP15F0M20 | 0.2 | ±100 | ±1 | 5931 |
6 | 5931MP08F0M50 | 0.5 | ±100 | ±1 | 5931 |
CSR Typical Application - Vehicle DC-DC
When choosing CSR, its rated power, accuracy, temperature coefficient, size, and cost should be considered. In addition, the long-term stability of CSR and its performance in extreme temperatures or harsh environments should also be considered.
Maintaining CSR includes regular inspections of its electrical performance and physical condition, such as resistance values, connection stability, and packaging integrity. When necessary, damaged CSR should be replaced to ensure the continuous and stable operation of the system.
- current monitoring
- Overcurrent protection
- Load Balancing
- Size and packaging
- Accuracy and stability
- Power Handling Capability
How to choose the most suitable current sensing resistor (CSR) for designing on-board OBC
Rated power and current capacity: Select a CSR that can withstand the maximum expected current and power of OBC, ensuring that it does not exceed its rated value under all operating conditions.
Accuracy: Select CSR with appropriate accuracy according to the control requirements of OBC. The higher the accuracy, the more accurate the monitoring and control of current, which helps to improve charging efficiency and battery life.
Temperature coefficient: Choose CSR with a low temperature coefficient to ensure stable performance across a wide temperature range that the vehicle may encounter.
Size and installation: Consider the size and installation method of CSR to ensure that it can adapt to vehicle space limitations and installation requirements.
Cost effectiveness: On the premise of meeting technical requirements, choose CSR with high cost-effectiveness to control the overall cost of OBC.
Long term stability and reliability: Choose CSR that has been validated and has long-term stability and high reliability to reduce the need for maintenance and replacement.
In the design and selection process of in vehicle OBC, detailed technical evaluation and cost analysis are usually required to make decisions, and prototype testing and long-term reliability testing may also be necessary to ensure that the selected CSR can meet the performance requirements and cost goals of OBC.
What is the role of CSR in vehicle OBC?
CSR is used in on-board OBC to monitor the current during the charging process in real time, ensuring that the current is within a safe range, preventing overcurrent situations, protecting the circuit from damage, and improving the overall efficiency of the system.
How to implement overcurrent protection in vehicle OBC?
Overcurrent protection is usually achieved by monitoring the voltage drop across the CSR terminals. When the current exceeds the preset safety threshold, the voltage drop detected by CSR will exceed the set value, and the control circuit will quickly respond by cutting off the power or reducing the current to protect the system.
How does CSR in on-board OBC affect system performance?
- The accuracy and stability of CSR directly affect the performance of OBC. High precision CSR can provide accurate current feedback, enabling the control circuit to more precisely regulate the output voltage, thereby improving system efficiency and response speed.
What are the considerations for CSR in design?
Factors to consider during design include resistance value, power rating, temperature coefficient, packaging size, and cost. Low resistance values can reduce power loss, but may require more precise amplifiers. In addition, resistors with low temperature coefficients can provide more stable measurements, but the cost may be higher.
What are the possible problems that CSR may encounter in practical applications?
Possible problems encountered in practical applications include the influence of parasitic resistance, errors caused by PCB layout, and changes in resistance values due to environmental temperature fluctuations. To reduce these effects, Kelvin connections (four terminal connections) can be used to minimize the impact of parasitic resistance, and the performance of the signal chain can be optimized through carefully designed PCB layouts.