The **HMS150-5-R** is a high-performance, compact **Current Transducer** manufactured by **LEM**. It is specifically designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic interface). --- ### ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Nominal Current ($I_{PN}$)** | 150 A | | **Measuring Range ($I_{PM}$)** | ± 450 A | | **Supply Voltage ($U_C$)** | +5 VDC (Unipolar) | | **Output Voltage ($V_{OUT}$)** | 2.5V ± (0.625 * $I_P$ / $I_{PN}$) V | | **Technology** | Open Loop Hall Effect | | **Accuracy** | ± 1% | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | Surface Mount Device (SMD) | --- ### ## Core Electronic Components & Features The device operates using **Hall Effect technology**, integrating several critical electronic stages within its small footprint: 1. **Magnetic Core:** A high-permeability magnetic circuit that concentrates the magnetic flux generated by the primary current. 2. **Hall Cell:** A semiconductor sensor that converts the magnetic flux density into a proportional millivolt signal. 3. **ASIC (Application Specific Integrated Circuit):** * **Amplification:** Boosts the weak Hall signal to a usable level. * **Temperature Compensation:** Corrects for drift, ensuring accuracy across the wide automotive-grade temperature range. * **Reference Voltage ($V_{REF}$):** Provides a stable 2.5V midpoint for bidirectional current sensing. 4. **Galvanic Isolation:** Ensures that the high-voltage primary conductor is electrically separated from the low-voltage microcontroller side, protecting sensitive electronics. --- ### ## Pin Configuration & Application | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **$V_C$** | Positive power supply (+5V) | | 2 | **$0V$** | Ground | | 3 | **$V_{OUT}$** | Output voltage proportional to current | | 4 | **$V_{REF}$** | Reference voltage (Output/Input) | #### ### Typical Applications * **EV/HEV Battery Management:** Monitoring charging and discharging cycles. * **AC/DC Variable Speed Drives:** Sensing motor phase currents. * **Solar Inverters:** Tracking power conversion efficiency. * **Uninterruptible Power Supplies (UPS):** Load monitoring and protection. --- ### ## Advantages of the "R" Suffix The **-R** version typically denotes **Tape & Reel** packaging, which is optimized for high-speed automated Pick-and-Place assembly lines in industrial manufacturing.