HAH1DR200-S Datasheet, PDF (1/5 Pages) LEM – AUTOMOTIVE CURRENT TRANSDUCER

AUTOMOTIVE CURRENT TRANSDUCER
HAH1DR 200-S
Introduction
Principle of HAH1DR Family
The HAH1DR family is for the electronic measurement
of DC, AC or pulsed currents in high power automotive
applications with galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
The HAH1DR family gives you the choice of having different
current measuring ranges in the same housing (from ± 200 A
up to ± 900 A).
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 I_P to be
measured.
The current to be measured I_P 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:
Features
●● Open Loop transducer using the Hall effect
●● Unipolar + 5 V DC power supply
●● Primary current measuring range up to ± 200 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 ratiometric (in sensitivity and offset)
●● Compact design.
B (I_P) = constant (a) x I_P
The Hall voltage is thus expressed by:
V_H= (R_H/d) x I x constant (a) x I_P
Except for I_P, all terms of this equation are constant.
Therefore:
V_H = constant (b) x I_P
The measurement signal V_H amplified to supply the user output
voltage or current.
Advantages
●● Excellent accuracy
●● Very good linearity
●● Very low thermal offset drift
●● Very low thermal sensitivity drift
●● Wide frequency bandwidth
●● No insertion losses.
+V_c
I_P
V_out
-V_c
0V
Automotive applications
●● Battery monitoring
●● Starter Generators
●● Inverters
●● HEV application
●● EV application.
Primary current I_P
Isolated output voltage
Fig. 1: Principle of the open loop transducer
090707/2
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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