AUTOMOTIVE CURRENT TRANSDUCER Introduction The HAH3DR family, a tri-phase tranducer is for the electronic measurement of DC, AC or pulsed s in high power automotive applications with galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). The HAH3DR family gives you the choice of having different measuring ranges in the same housing (from ± 200 A up to ± 900 A). Principle of HAH3DR Family The open loop transducers uses a effect integrated circuit. The magnetic flux density B, contributing to the rise of the voltage, is generated by the primary to be measured. The to be measured is supplied by a source i.e. battery or generator (Fig. 1). Within the linear region of the hysteresis cycle, B is proportional to: Features Open Loop transducer using the effect Low voltage application Unipolar + 5 V DC power supply measuring range up to ± 700 A Maximum RMS primary limited by the busbar, the magnetic core or the ASIC temperature T < + 150 C Operating temperature range: - 40 C < T < + 125 C voltage: full ratiometric (in sensitivity and offset). B ( ) = constant (a) x The voltage is thus expressed by: V H = (R H /d) x I x constant (a) x Except for, all terms of this equation are constant. Therefore: V H = constant (b) x The measurement signal V H amplified to supply the user output voltage or. Advantages Exent accuracy Very good linearity Very low thermal offset drift Very low thermal sensitivity drift Wide frequency bandwidth No insertion losses Very fast response time. +V c -V c 0V Automotive applications Isolated output voltage Starter Generators Inverters HEV application EV application DC / DC converter. Fig. 1: Principle of the open loop transducer Page 1/5
Dimensions HAH3DR family (in mm) Bill of materials Electronic schematic Plastic case PBT GF 30 % (Color natural-white) Magnetic core FeSi wound core Pins Copper alloy gold plated Mass ~ 120 g ± 5% R L C L > 10 kw optional resistor for signal line diagnostic 4 nf < C L < 18 nf EMC protection Nominal value (C L is an obligation to stabilize and to avoid the undulation of the output signal) Ip1 Ip2 Phase 1 Phase 2 Amplifier Amplifier 4 3 2 1 Vc 1 OUT 1 Ref 1 8 Vc 2 7 OUT 2 6 Vc OUT 1 OUT 2 +5 VDC Pin5 Pin4 Pin3 Pin2 Capacitor of V ref / Capacitor of V c / 1 mf Ip3 Phase 3 5 E 11 Amplifier 10 Ref 2 12 Vc 3 OUT 3 OUT 3 Pin1 9 Ref 3 Page 2/5
Absolute maximum ratings Operating charcteristics Parameter Symbol Unit Specification Min Typ Max Conditions Electrical Data Max primary peak max A 1) 8 Not operating Supply continuous over voltage V C V Exceeding this voltage may temporarily 6.5 reconfigure the circuit until next power-on voltage min 0.2 @ V C = 5 V, T A V sz V voltage max 4.8 @ V C = 5 V, T A Maximum reverse polarity 2) ma -80 80 Continuous output I OUT ma -1 1 R L = 10 kω Rms voltage for AC isolation test V d kv 2.5 50 Hz, 1 min, IEC 60664 part1 Isolation resistance R IS MΩ 500 500 V DC- ISO 16750 Electrostatic discharge voltage (HBM) V ESD kv 2 JESD22-A114-B class 2 Ambient storage temperature T S C -50 125 Clearance distance dci mm 5.08 Creepage distance dcp mm 5.08 Parameter Symbol Unit Specification Min Typ Max Conditions Electrical Data A -700 700 Supply voltage *) V C V 4.75 5.00 5.25 voltage (Analog) 3) V OUT V V OUT = (V C /5) X (2.5 + G X ) @ V C Sensitivity 3) *) G mv/a 2.86 @ V C = 5 V Current consumption (for 3 phases) *) I C ma 44 50 @ V C = 5 V, @ - 40 C < T A < 125 C Load resistance R L ΚΩ 10 internal resistance R OUT Ω 10 DC to 1 khz Capacitive loading C L nf 4 4.7 18 Ambient operating temperature T A C -40 125 drift versus power supply V OUT PS % 0.5 Performance Data (Phases Coupling influences included) @ 4 Sigma Sensitivity error *) ε G % ± 0.5 @ T A ± 1 @ T A, after T cycles Electrical offset voltage *) V OE ± 4 @ T A, @ V C = 5 V Magnetic offset *) V OM mv -7.5 7.5 @ T A, @ V C = 5 V, after ± Global offset voltage *) V O -25 25 @ T A, @ V C = 5 V, Hysteresis included Average temperature coefficient of V OE TCV OE AV mv/ C -0.15 0.15 @ - 40 C < T < 125 C Average temperature coefficient of G TCG AV %/ C -0.040 ± 0.01 0.040 @ - 40 C < T < 125 C Linearity error *) ε L % -1 1 @ V C = 5 V @, T A, @ I = Response time to 90 % of N step t r µs 4 6 @ di/dt = 100 A/µs Frequency bandwidth 4) BW khz 40 @ -3 db Phase delay -4 0 @ DC to 1 khz voltage noise peak-peak V no pp mv 20 DC to 1MHz Notes: *) The parameter with *) will be checked 100% during the calibration phase 1) Busbar temperature must be below 150 C 2) Transducer not protected against reverse polarity. 3) The output voltage V OUT is fully ratiometric. The offset and sensitivity are dependent on the supply voltage V C relative to the following formula: VC 1 5 IP = VOUT with G in (V/A) 2 G VC 4) Tested only with small signal only to avoid excessive heating of the magnetic core. Page 3/5
: Global absolute error (mv) All phases coupling influences included & Specified at 4 Sigma ±120.0 Global Absolute Error (mv) ±100.0 ±80.0 ±60.0 ±40.0 ±20.0 ±0.0-700 -600-500 -400-300 -200-100 0 100 200 300 400 500 600 700 Ip (A) Global error @ 25 C (mv) Global error @ T range (mv) (A) Globale error @ 25 C (mv) Globale error @ T range (mv) -700 ±50.0 ±100.0 0 ±25.0 ±40.0 700 ±50.0 ±100.0 Values will be finalized after ending of the PV tests. Page 4/5
noise voltage: The output voltage noise is the result of the noise floor of the elements and the linear I C amplifier gain. Magnetic offset: The magnetic offset is the consequence of an over- on the primary side. It s defined after an excursion of max. Linearity: The maximum positive or negative discrepancy with a reference straight line V OUT = f ( ). Unit: linearity (%) expressed with full scale of max. Linearity is measured on cycle +, O, -, O, + without magnetic offset (average values used). V OUT PERFORMANCES PARAMETERS DEFINITIONS Non linearity example Sensitivity: The Transducer s sensitivity G is the slope of the straight line = f ( ), it must establish the relation: ( ) = V C /5 (G x + 2.5) (*) (*) For all symetrics transducers. Offset with temperature: 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 I OT is a maximum variation the offset in the temperature range: I OT = I OE max - I OE min The Offset drift TCI OEAV is the I OT value divided by the temperature range. Reference straight line Max linearity error Linearity variation in I N % 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 G T is the maximum variation (in ppm or %) of the sensitivity in the temperature range: G T = (Sensitivity max - Sensitivity min) / Sensitivity at 25 C. The sensitivity drift TCG AV is the G T value divided by the temperature range. Response time (delay time) t r : The time between the primary signal and the output signal reach at 90 % of its final value. 90 % I [A] t r I T I S Offset voltage @ = 0 A: Is the output voltage when the primary is null. The ideal value of V O is V C /2 at V C = 5 V. So, the difference of V O -V C /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. Environmental test specifications See PV test. t [µs] Typical: Theorical value or usual accuracy recorded during the production. Page 5/5