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Current Sensor
EV Application
Battery Management System
SOC is a Core Metric for Battery State Estimation
- 1.Indicate the battery's power information
- 2.Affect the control strategies of the battery and the entire vehicle
- 3.Serve as Basis for Cell Balancing
- 4.Foundation for Other State Estimates (SOH/SOP/SOE)
Basic SOC Estimation Method: Coulomb Counting
If the current measurement accuracy is low, it leads to large cumulative errors in SOC estimation Current Industry Typical SOC Estimation Accuracy: ±10%
Shunt Based Current Sensing Module
SRES and HRES are designed to reduce the difficulty of achieving high-accuracy current sensing under complex operating conditions.
Compared with existing high-precision sensing solutions, the shunt in this series achieves a TCR of 5 ppm/°C over a wide temperature range of +20°C ~ +125°C, a performance that conventional solutions can only achieve with complex temperature compensation. At the same time, thermal EMF is reduced from 3 μV/°C in conventional designs to 0.6 μV/°C, significantly minimizing its impact on current sensing accuracy.
Without changing the conventional shunt size and mounting conditions, a high-performance NTC thermistor is integrated, enabling accurate temperature monitoring of the shunt and supporting higher precision current measurement.
Overall, the SRES and HRES series significantly improve the stability and reliability of high-current precision sensing, while enabling easier implementation of high-accuracy current measurement.
Characteristic
- Rated current sensing range: -1200A to +1200A
- ±0.3% current sensing accuracy achievable without algorithm compensation
- Temperature coefficient as low as 2 ppm/°C
- Thermal EMF as low as 0.6 μV/°C
- Operating temperature range: -40°C to +125°C
- Excellent long-term reliability
SRES, HRES New-Generation High-Precision Shunt Current Sensing Modules
SRES6918BL100VST0
SRES8436BL050VST0
HRES6918BL025MST0
HRES6918BL050MST0
HRES8436BL015MST0
HRES8436BL025MST0
| Continuous Current Range | -400A~+400A | -800A~+800A | -600A~+600A | -500A~+500A | -1200A~+1200A | -1000A~+1000A |
| Connecto | Horizontal | Horizontal | Horizontal | Horizontal | Horizontal | Horizontal |
| Shunt | ||||||
| Resistance | 100μΩ | 50μΩ | 25μΩ | 50μΩ | 15μΩ | 25μΩ |
| Tolerance | ±0.1% | ±0.1% | ±0.1% | ±0.1% | ±0.1% | ±0.1% |
| TCR | ±5ppm/℃(+20℃~+125℃) | ±5ppm/℃(+20℃~+125℃) | ±15ppm/℃(+20℃~+125℃) | ±15ppm/℃(+20℃~+125℃) | ±15ppm/℃(+20℃~+125℃) | ±15ppm/℃(+20℃~+125℃) |
| Thermal EMF | ≤0.6μV/℃ | ≤0.6μV/℃ | ≤0.6μV/℃ | ≤0.6μV/℃ | ≤0.6μV/℃ | ≤0.6μV/℃ |
| Parasitic Inductance | ≤3nH | ≤3nH | ≤3nH | ≤3nH | ≤3nH | ≤3nH |
| Operating Temperature Range | -40℃~+125℃ | -40℃~+125℃ | -40℃~+125℃ | -40℃~+125℃ | -40℃~+125℃ | -40℃~+125℃ |
CB Series
CB series Shunt Based Current Sensor is an automotive-grade bidirectional DC sensing module with high accuracy, low power consumption, and fast response, as well as excellent response speed, temperature stability, and anti-interference capability.
Built on a low-TCR shunt with 16-bit ADC and M0 MCU, it supports CAN2.0 A/B communication with integrated ESD protection, temperature compensation, and calibration.
Operates from -40°C to 105°C, supports ±350A continuous current and -50°C to 150°C temperature sensing, delivering ±0.5% accuracy (20A~350A and -350A~-20A), and up to ±3℃ temperature error.
CB series operates with a single power 6V~18V, with＜216mW consumption (12VDC). Achieves full isolation between high/ low voltage, suitable for both electrodes of battery system.
CB350
Automotive current sensors with functional safety have passed
ISO 26262-2018 ASIL certified by UL
CB350
CB600
CB1000
| Current Measurement Range | -8000A ~ +8000A | -20000A ~ +20000A | -22400A ~ +22400A |
| Continuous Operating Range | ±350A | ±600A | ±1000A |
| Measurement Accuracy | ±0.5% MAX | ±0.1% MAX | ±0.1% MAX |
| Resolution | 10mA | 1mA | 1mA |
| Temperature Measurement Range | -50°C ~ +150°C | -50°C ~ +150°C | -50°C ~ +150°C |
| Measurement Error | ±3°C MAX | ±3°C MAX | ±3°C MAX |
| Temperature Resolution | 0.1°C | 0.1°C | 0.1°C |
| Communication Protocol | CAN2.0 A/B | CAN2.0 A/B | CAN2.0 A/B |
| Data Format | Selectable | Selectable | Selectable |
| CAN ID | Configurable | Configurable | Configurable |
| CAN Baud Rate | 250Kbps / 500Kbps / 1Mbps (Configurable) | 250Kbps / 500Kbps / 1Mbps (Configurable) | 250Kbps / 500Kbps / 1Mbps (Configurable) |
| Terminal Resistor | Integrated 120Ω / Not Integrated (Selectable) | Integrated 120Ω / Not Integrated (Selectable) | Integrated 120Ω / Not Integrated (Selectable) |
| Supply Voltage | 6VDC ~ 18VDC | 6VDC ~ 18VDC | 6VDC ~ 18VDC |
| Operation Temperature Range | -40°C ~ +105°C | -40°C ~ +105°C | -40°C ~ +105°C |
| Power Consumption | ≤216mW @12VDC | ≤384mW @12VDC | ≤384mW @12VDC |
| Galvanic Isolation | 3000VAC | 3000VAC | 3000VAC |
Comparison: Shunt/ Shunt Based Current Sensing Module/ Shunt Based Current Sensor
·Simple process
·Low cost
·Rugged structure
·Easy to customize
·Balanced cost-performance ratio
·Temperature compensation eliminates TCR effect
·Wide temperature range measurement capability
·Automotive-grade R&D and production system
·Standard digital interface outputs (CAN/RS-232, etc.)
·Calibration-free operation, pre-integrated with systems, reduces the overall system development cycle
| Feature | Shunt | Shunt Based Current Sensing Module | Shunt Based Current Sensor | |
|---|---|---|---|---|
| Output Signal | Analog Signal (Actually a high-precision resistor) | With Initial Resistance and Temperature Cation Coefficient | Digital Signal (Multiple Protocols, Speeds and Data Form) | |
| Design requirements | Hardware | Fully User Design | Partially User Design | Not Required |
| Software | Design Required | Design Required | ||
| Shunt Soldering | Required, Complicated | Not Required | ||
| Offline Calibration | Calibration Equipment Required, Complicated | Calibration Equipment Required, Simple | ||
| Accuracy | Fully User Design | ±0.3%, Partially User Design | ±0.1%, Guaranteed by Product | |
| Reliability | Guaranteed by User Design | Guaranteed by User Design | High, Guaranteed by Product, Tested in Multiple Conditions | |
Advanced Measurement Center
AMC is a professional engineering team with years of experience of algorithms for current sensor based on shunt. The current sensor now have the ability of current sensing with ultra-tight tolerance which is international top current sensing performance, and achieved mass production.
How is Current Sensor Produced?
