HC2F100-SN Datasheet, PDF (1/5 Pages) LEM – AUTOMOTIVE CURRENT TRANSDUCER HC2F100-SN CLIPS

AUTOMOTIVE CURRENT TRANSDUCER
HC2F100-SN CLIPS
Introduction
Principle of HC2F CLIPS Family
The HC2F CLIPS Family is for the electronic measurement of DC,
AC or pulsed currents in high power and low voltage automotive
applications with galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
The HC2F CLIPS family gives you the choice of having different
current measuring ranges in the same housing.
Features
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 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:
B (I_P) = constant (a) x I_P
The Hall voltage is thus expressed by:
●● Open Loop transducer using the Hall effect
●● Low voltage application
●● Unipolar + 5 V DC power supply
●● Primary current measuring range from 80 A up to 250 A
●● Maximum RMS primary admissible current: defined by
busbar to have T° < + 150°C
●● Operating temperature range: - 40°C < T° < + 125°C
●● Output voltage: full ratiometric (in sensitivity and offset)
●● Compact design for PCB mounting.
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.
Automotive applications
I_P
Primary current I_P
+V_c
V_out
-V_c
0V
Isolated output voltage
●● Electrical Power Steering
●● Starter Generators
●● Converters ...
Fig. 1: Principle of the open loop transducer
18october2011/2
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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