DHAB S/24

AUTOMOTIVE CURRENT TRANSDUCER OPEN LOOP TECHNOLOGY DHAB S/24 Introduction Principle of DHAB Family The DHAB family is best suited for DC, AC, or pulsed currents measurement in high power and low voltage automotive applications. It features galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). The DHAB family gives you a choice of having different current measuring ranges in the same housing (from ± 20 up to ± 600 A). The open loop transducers uses a 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 current to be measured IP is supplied by a current source i.e. battery or generator (Figure 1). Within the linear region of the hysteresis cycle, B is proportional to: B (IP) = constant (a) x IP Features The Hall voltage is thus expressed by: ●● Open Loop transducer using the Hall effect sensor ●● Low voltage application ●● Unipolar + 5 V DC power supply ●● Primary current measuring range up to ± 75 A for channel 1 and ± 500 A for channel 2 ●● Maximum RMS primary admissible limited by the busbar, 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. the magnetic core or the ASIC temperature T° < + 150 °C ●● Operating temperature range: - 40 °C < T° < + 125 °C ●● Output voltage: fully ratiometric (in sensitivity and offset) 2 measuring ranges to have a better accuracy. Advantages ●● Excellent accuracy ●● Very good linearity ●● Very low thermal offset drift ●● Very low thermal sensitivity drift ●● Hermetic package. Fig. 1: Principle of the open loop transducer Automotive applications ●● Battery Pack Monitoring ●● Hybrid Vehicles ●● EV and Utility Vehicles. N° 97.B6.99.024.0 05May2015/version 1 Page 1/7 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DHAB S/24 Dimensions (in mm) IP Ucc Mechanical characteristics ●● Plastic case ●● Magnetic core System Architecture >PA66-GF25< LEM - DHAB sensor Uc + 5V Channel1:FeNi alloy 69.5 g ●● Pins Brass tin plated Gnd IP Primary current Gnd Channel 1 R CLOAD 10 nF Gnd Gnd Gnd Channel 2 ●● Vout > Vo when IP flows in the positive direction (see arrow on drawing). C RLOAD Gnd Remarks IP =  5 · Vout − VO  · 1 with G in (V/A)  UC  G + 5V 47 nF 100 nF Channel 2: FeSi alloy ●● Mass Typical application Schematic interface 10 nF Gnd Gnd R RLOAD CLOAD Gnd Gnd C Gnd RL > 10 kW optional resistor for signal line diagnosis CL < 100 nF EMC protection RC Low pass filter EMC protection (optional) Page 2/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com Absolute ratings (not operating) Parameter DHAB S/24 Symbol Unit Maximun supply voltage Maximun over voltage UC Min Specification Typical Max 8.5 14 V Maximun reverse voltage - 14 Ambient storage temperature TS °C - 40 125 Iout mA - 10 10 Vout V tc min Maximum output over voltage (Analog) Maximum Output short circuit duration 1 min 1 min @ TA = 25 °C Continuous output current Maximum output voltage (Analog) Conditions 8.5 14 1 min @ TA = 25 °C 2 Operating characteristics in nominal range (IPN) Parameter Supply voltage Ambient operating temperature output current Current consumption Power up inrush current Load resistance Capacitive loading Symbol Unit Electrical Data V 4.5 UC - 10 °C TA - 40 mA -1 Iout IC Resolution mA mV Output clamping voltage min 1) Output clamping voltage max 1) Output internal resistance Frequency bandwidth Power up time Setting time after over load Primary current Calibration current Offset voltage 1) Sensitivity 1) Resolution Output clamping voltage min 1) Output clamping voltage max 1) Output internal resistance Frequency bandwidth Power up time Setting time after over load 1) Specification Typical Max RL ΚΩ 10 nF CL 1 Performance Data Channel 1 IP channel 1 A - 75 ICAL 60 VO V mV/A G Primary current Calibration current Offset voltage 1) Sensitivity 1) Notes: Min VSZ V 5 15 5.5 65 125 1 20 40 75 60 2.5 26.7 0.25 4.75 1 80 25 Ω Hz ms ms Performance Data Channel 2 IP channel 2 A - 500 ICAL - 500 VO V 2.5 mV/A 4 G mV 2.5 0.24 0.25 VSZ V 4.74 4.75 ROUT Ω 1 BW Hz 80 ms 25 ms ROUT BW High accuracy Reduced accuracy @ UC < 3.5 V 100 @ TA = 25 °C @ UC = 5 V @ UC = 5 V @ UC = 5 V 2.5 0.24 4.74 Conditions 0.26 4.76 10 @ UC = 5 V @ UC = 5 V @ - 3 dB 120 25 500 500 0.26 4.76 10 @ TA = 25 °C @ UC = 5 V @ UC = 5 V @ UC = 5 V @ UC = 5 V @ UC = 5 V @ - 3 dB 120 25 The output voltage Vout is fully ratiometric. The offset and sensitivity are dependent on the supply voltage UC relative to the following formula:: IP =  5 · Vout − VO  · 1 with G in (V/A)  UC  G Page 3/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DHAB S/24 ACCURACY Channel 1 Parameter Symbol Unit Electrical offset current IOE Channel 1 mA Magnetic offset current IOM Channel 1 mA IO Channel 1 Global offset current Min mA Specification Typical Max Conditions ± 100 @ TA = 25 °C ± 100 @ TA = 25 °C - 350 350 @ TA = 25 °C - 550 550 @ - 10 °C < T° < 65 °C - 850 850 @ - 40 °C < T° < 125 °C ± 0.5 Sensitivity error εG % Linearity error εL % @ TA = 25 °C ±2 @ - 10 °C < T° < 65 °C ± 3.5 @ - 40 °C < T° < 125 °C ± 0.5 off full range Global Absolute Error (A) Channel 1 Global Absolute Error (A) Temperature - 40 - 20 0 25 65 Global offset error ± 0.68 ± 0.58 ± 0.48 ± 0.35 ± 0.55 ± 0.85 125 Global offset error @ ± 10 A Global offset error @ ± 20 A ± 2.17 ± 1.75 ± 1.33 ± 0.80 ± 1.64 ± 2.90 ± 3.25 ± 2.65 ± 2.05 ± 1.30 ± 2.50 ± 4.30 DHAB S/24 Channel 1: Global Absolute Error Global absolute error (A) ± 5.00 ± 4.00 ± 3.00 ± 2.00 ± 1.00 ± 0.00 -40 -20 0 20 40 60 80 100 120 140 Temperature (°C) Global Offset Error Global Error @±40A Global Error @±75A Page 4/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DHAB S/24 ACCURACY Channel 2 Parameter Symbol Unit Electrical offset current IOE Channel 2 mA Magnetic offset current IOM Channel 1 mA IO Channel 1 Global offset current mA Min Specification Typical Max ± 0.8 @ TA = 25 °C ± 2.8 @ TA = 25 °C -4 4 - 4.4 4.4 @ - 10 °C < T° < 65 °C -5 5 @ - 40 °C < T° < 125 °C @ TA = 25 °C ± 0.5 Sensitivity error εG Linearity error εL % % Channel 2 Conditions @ TA = 25 °C ±2 @ - 10 °C < T° < 65 °C ± 3.5 @ - 40 °C < T° < 125 °C ± 0.5 off full range Global Absolute Error (A) Temperature - 40 - 20 0 25 65 125 Global offset error ± 4.65 ± 4.45 ± 4.25 ± 4.00 ± 4.40 ± 5.00 Global offset error @ ± 10 A Global offset error @ ± 20 A ± 10.88 ± 9.38 ± 7.88 ± 6.00 ± 9.00 ± 13.50 ± 17.43 ± 14.53 ± 11.63 ± 8.00 ± 13.80 ± 22.50 DHAB S/24 Channel 2: Global Absolute Error ± 24.00 Global absolute error (A) ± 20.00 ± 16.00 ± 12.00 ± 8.00 ± 4.00 ± 0.00 -40 -20 0 20 40 60 80 100 120 140 Temperature (°C) Global Offset Error Global Error @±200A Global Error @±500A Page 5/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DHAB S/24 PERFORMANCES PARAMETERS DEFINITIONS Sensitivity: Primary current definition: The transducer’s sensitivity G is the slope of the straight line Vout = f (IP), it must establish the relation: VOUT Primary current nominal (IPN) Primary current, measuring range (IPM) Vout (IP) = UC/5 (G ٠ IP + Vo) Offset with temperature: I [A] IT 90 % IP Vout IP Definition of typical, minimum and maximum values: Minimum and maximum values for specified limiting and safety conditions have to be understood as such as values shown in “typical” graphs. On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower limits and a probability for measured values to lie within this interval. Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that the probability for values of samples to lie in this interval is 99.73 %. For a normal (Gaussian) distribution, this corresponds to an interval between -3 sigma and +3 sigma. If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding to an interval between -sigma and +sigma for a normal distribution. Typical, maximal and minimal values are determined during the initial characterization of a product. Output noise voltage: The output voltage noise is the result of the noise floor of the Hall elements and the linear amplifier. Magnetic offset: The magnetic offset is the consequence of an over-current on the primary side. It’s defined after an excursion of IPN. Linearity: The maximum positive or negative discrepancy with a reference straight line Vout = f (IP). Unit: linearity (%) expressed with full scale of IPN. Response time (delay time) tr: The time between the primary current signal (IPN) and the output signal reach at 90 % of its final value. Vout Non linearity example tr t [µs] The error of the offset in the operating temperature is the variation of the offset in the temperature considered with the initial offset at 25 °C. The offset variation IOT is a maximum variation the offset in the temperature range: IOT = IOE max - IOE min The offset drift TCIOEAV is the IOT value divided by the temperature range. Sensitivity with temperature: The error of the sensitivity in the operating temperature is the relative variation of sensitivity with the temperature considered with the initial offset at 25 °C. The sensitivity variation GT is the maximum variation (in ppm or %) of the sensitivity in the temperature range: GT = (Sensitivity max - Sensitivity min) / Sensitivity at 25 °C. The sensitivity drift TCGAV is the GT value divided by the temperature range. Deeper and detailed info available is our LEM technical sales offices (www.lem.com). Offset voltage @ IP = 0 A: The offset voltage is the output voltage when the primary current is zero. The ideal value of VO is UC/2 at UC = 5 V. So, the difference of VO -UC/2 is called the total offset voltage error. This offset error can be attributed to the electrical offset (due to the resolution of the ASIC quiescent voltage trimming), the magnetic offset, the thermal drift and the thermal hysteresis. Deeper and detailed info available is our LEM technical sales offices (www.lem.com). Reference straight line Max linearity error IP Linearity variation in IPN Page 6/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com DHAB S/24 Environmental test specifications: Name Thermal shocks Power temperature Temperature humidity cycle test Standard GM &5.5.5 (IEC 60068 Part 2-14) GM &5.5.6 (IEC 60068 Part 2-14 Nb GM &6.18.1 (IEC 60068 2-38) Conditions T° - 40 °C + 125 °C / 300 cycles not connected. Criteria: εG < 3 % @ 25 °C T° - 40 °C + 125 °C/595 cycles, supply voltage = 5 V Criteria: εG < 3 % @ 25 °C T° -10 °C + 65 °C/10 cycles, supply voltage = 5 V Criteria: εG < 3 % @ 25 °C Mechanical tests Vibration test GM &6.6.2 (IEC 60068 2-64) Acceleration 30m/s2, 25 °C, frequency 20 to 1000 Hz/8h each axis Drop test GM &6.10 (IEC 60068 2-32) Drop 1m, 2 falls/part, 1 part/axis, 3 axes, criteria: relative sensitivity error 3 % RMS voltage for AC Insulation test GM &6.4-13 (IEC 60068 2-38) Bulk current injection immunity ISO 11452-4 EMC Test Electrostatic discharge immunity test Criteria B 2 KV, Criteria B Page 7/7 05May2015/version 1 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com