HAG240-SP-1 Datasheet | LEM

AUTOMOTIVE CURRENT TRANSDUCER HAG 240-V/SP1 Introduction The HAG Family is best suited for DC, AC or pulsed currents measurement in high power and low voltage automotive applications. It’s contains galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). The HAG family gives you a choice of having different current measuring ranges in the same housing (from ± 50 A up to ± 250 A). Principle of HAG Family The open loop transducers use an Hall effect integrated circuit. The magnetic flux density B, contributing to the rise of the Hall voltage, is generated by the primary current IP to be measured. The control current IP is supplied by a current source i.e. battery or generator (Fig. 1). Within the linear region of the hysteresis cycle, B is proportional to: B (IP) = constant (a) x IP The Hall voltage is thus expressed by: VH= (RH/d) x I x constant (a) x IP Except for IP, all terms of this equation are constant. Therefore: VH = constant (b) x IP The measurement signal VH amplified to supply the user output voltage or current. Features - - Open Loop transducer using the Hall effect sensor - - Low voltage application - - Unipolar + 5 V DC power supply - - Primary current measuring range from 0 A up to 240 A - - Maximum rms primary current limited by the busbar, the magnetic core or the ASIC temperature T° < + 150°C - - Operating temperature range: - 40°C < T° < + 125°C - - Output voltage: full ratio-metric (in gain and offset). Advantages - - Good accuracy for high and low current range - - Good linearity - - Low thermal offset drift - - Low thermal gain drift - - Hermetic package. -Vc IP Vout +Vc 0V Automotive applications - - Battery Pack Monitoring - - Hybrid Vehicles - - EV and Utility Vehicles. Primary current I P Isolated output voltage Fig. 1: Principle of the open loop transducer Page...