Isolation Amplifier For Voltage Sensing In EVs And HEVs White Paper

Posted By : ES Admin
Isolation Amplifier For Voltage Sensing In EVs And HEVs White Paper
The introduction of electric and hybrid electric vehicles have added high voltage electric modules into the car. The battery stack in a hybrid vehicle can be in excess of 150 V, which is then boosted to a much higher voltage level for the inverter driving the electric motor. By Kenji Yamamoto and Andy Poh of Avago Technologies.
The ACPL-782T automotive isolation amplifier, which is part of Avago’s R2Coupler series, features safe insulation, high common mode transient rejection and precision analog sensing – all in a compact 300 mil dual-in-line package.

Safe Insulation

With the high voltage and current levels present, components with excellent isolation and insulation specifications are needed, and optocouplers have been the component of choice by the automotive manufacturers for many years. As part of the R2Coupler family, the ACPL-782T targets demanding, long-life automotive applications. R2Coupler devices feature a thick triple insulation layer construction that forms the basis of their reinforced insulation rating. With 891Vpeak working voltage and 6000 Vpeak transient over-voltage specifications, the ACPL-782T can meet the insulation requirements of most automotive applications.

Analog Signal Isolation

The high current switching of the inverter that powers the vehicle motor generates high speed, high voltage transients throughout the electrical system. This poses a tough challenge to the processor monitoring the rail voltage and to the many analog sensors that operate in an environment with high noise levels, large common mode voltages and ground loop currents.

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