Technical Analysis of HAH3DR 800-S07/SP4 Three-phase Current Sensor
1. One-sentence Description
The HAH3DR 800-S07/SP4 is a three-phase open-loop Hall-effect current sensor specifically designed for automotive applications. It supports high-precision measurement (±800A) of direct current, alternating current, and pulse current, and features electrical isolation and stability across a wide temperature range.
2. Core Features
- Open-loop Hall-effect Technology: Based on the proportional relationship between magnetic field strength and current, it enables non-contact measurement through Hall voltage.
- Wide Measurement Range: The single-channel current detection range reaches ±800A, suitable for high-power scenarios.
- Low Voltage Compatibility: It only requires a 5V DC power supply, compatible with in-vehicle low-voltage systems.
- High Reliability: No insertion loss, high-frequency bandwidth (40kHz), and strong anti-interference ability.
- Integrated Design: A single module covers three-phase current detection, simplifying wiring.
- Compatibility with Mainstream Platforms: It perfectly matches the Infineon HybridPACK™ drive system.
- Weld-free Installation: The press-fit terminals or blind threaded holes (SP4 series) design improves assembly efficiency.
3. Core Technical Indicators
| Parameter | Symbol | Typical Value | Condition |
|---|---|---|---|
| Supply Voltage | - | 5V | ±5% |
| Operating Temperature | - | -40°C~125°C | Continuous operation |
| Output Voltage Formula | - | - | - |
| Sensitivity | - | 2.50 mV/A | Rated current 800A |
| Linearity Error | - | ±1% FS | -1000A~1000A |
| Delay Time | - | 2~6 μs | - |
| Bandwidth | BW | 40 kHz | -3dB |
4. The Story Behind the Chip
The HAH3DR series stems from LEM Group's profound understanding of the automotive electrification trend. Traditional current detection solutions have problems such as large size and susceptibility to interference, while open-loop Hall technology solves these pain points through an integrated design. The HAH3DR 800-S07/SP4 uses patented magnetic circuit optimization (such as the blind threaded hole design of the SP4 series) to reduce thermal drift while ensuring accuracy, making it particularly suitable for the harsh environment of new energy vehicles.
5. Design Concept
- High Reliability First: Through the temperature resistance test at ±125°C, 8kV ESD protection, and 1000-hour high-temperature aging screening, long-term stability in in-vehicle scenarios is ensured.
- Balance between Precision and Efficiency: The introduction of temperature compensation algorithms (TCU, TCS) controls the sensitivity temperature drift within ±0.03%/°C.
- Modular Expansion: It supports multi-phase integration, facilitating the construction of three-phase motor control systems.
6. Application Scenarios
- New Energy Vehicles: Real-time current monitoring in battery management systems (BMS) and motor controllers (MCU).
- Hybrid Power Systems: Power management in DC/DC converters and chargers of HEV/EV.
- Industrial Field: Current detection and protection in charging piles and frequency converters.
7. Unique Advantages
- Zero Insertion Loss: No on-resistance, avoiding energy waste.
- Ultra-fast Response: The 90% output delay is only 2~6μs, suitable for high-frequency switching scenarios.
- Easy Installation: The SP4 series has built-in blind threaded holes and can be fixed to the heat dissipation substrate without welding.
- Full Operating Condition Calibration: It provides error compensation data in the full temperature range of -40°C~125°C (see the total error curve diagram).
8. What Engineers Must Know When Selecting
- Rated Current Matching: Select the model according to the load (e.g., 800A corresponds to HAH3DR 800-S07/SP4).
- Thermal Design Consideration: The maximum allowable current is limited by the temperature rise of the bus copper bar, magnetic core, and ASIC (cooperative design is required).
- Anti-interference Measures: It is recommended to use an RC filter (optional) and shielded cables to suppress EMC noise.
- Certification Compliance: It has passed the ISO 16750-4 vibration/temperature shock test, meeting the automotive-grade reliability requirements.
- Diagnostic Interface: An optional 10kΩ resistor can be connected to the signal line to achieve online fault detection.
Summary
The HAH3DR 800-S07/SP4, with its high precision, wide temperature range, and weld-free design, has become a core device for current detection in new energy vehicles. Engineers need to focus on temperature compensation parameters and mechanical installation specifications to fully leverage its performance advantages.
