你的位置：Serial Number | Model | Resistance（mΩ) | TCR（ppm/℃) | Accuracy（%） | Encapsulation |
1 | 1206ML10FR005 | 5 | ±50 | ±1 | 1206 |
2 | 1206ML10FR007 | 7 | ±50 | ±1 | 1206 |
3 | 1206ML10FR010 | 10 | ±50 | ±1 | 1206 |
4 | 0805ML05FR005 | 5 | ±75 | ±1 | 0805 |
Typical Application of CSR - Electricity Meter
In car applications, due to the potential for significant fluctuations in battery voltage, the design of DC-DC converters and CSR needs to take these fluctuations into account and ensure reliable operation even under extreme conditions. CSR can effectively improve the performance and reliability of electricity meters, ensuring the accuracy and fairness of energy metering.
- current monitoring
- Overcurrent protection
- Load Balancing
- Size and packaging
- Accuracy and stability
- Power Handling Capability
Application of Current Sensing Resistors (CSR) in Electric Meters
Current measurement: CSR measures the voltage drop generated by the current flowing through a resistor by connecting it in series in the current circuit of an electric meter, thereby achieving accurate measurement of the current.
Accuracy requirements: Electric meters require high accuracy for current measurement, usually requiring CSR to have a low temperature coefficient and high-precision resistance values to ensure stability and accuracy at different environmental temperatures.
Power loss: When choosing CSR, it is necessary to consider its impact on system power loss. The smaller the resistance value, the lower the power loss, but the detected signal is also smaller, which may affect the measurement accuracy.
Long term stability: Electric meters usually require long-term stable operation, so CSR needs to have good long-term stability and reliability to ensure the accuracy of the meter throughout its entire service life.
Maintenance and Calibration: In order to ensure the accuracy of the electricity meter, CSR needs to perform regular maintenance and calibration to ensure that it continuously provides accurate measurement results.
Cost effectiveness: When choosing CSR, it is also necessary to consider cost-effectiveness and choose products with high cost-effectiveness to control the overall cost of the electricity meter.
How does CSR in electricity meters affect system performance?
The accuracy and stability of CSR directly affect the performance of the electricity meter. 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 factors should be considered when selecting a current sensing resistor?
Including resistance, accuracy, temperature coefficient (TCR), power processing capability, and size. For example, the current sensing resistors provided by Delta have the characteristics of small size, high precision, and low temperature coefficient. The resistance range is from 0.2M Ω to 10 Ω, and the rated power also varies
How to choose a CSR suitable for electricity meters?
- 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.
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.