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Transducer for EV battery claims high accuracy

Posted: 10 Jul 2012     Print Version  Bookmark and Share

Keywords:EV  battery  current transducer 

LEM debuts the CAB high-accuracy current transducer that boasts a high level of precision when measuring current flow into and out of the battery packs for Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs).

 CAB transducer

Car makers need this data to maximise the range of the vehicle, to keep the battery in good condition, and to enable use of the optimum size of battery pack.

LEM's CAB transducer boasts current measurement capability of up to ±400A, with unlimited overload capacity, and with excellent accuracy: Coulomb-counting error over the driving cycle is reduced to under 0.1 per cent. It is galvanically-isolated and non-intrusive; no electrical connection to the power circuit is needed. This ensures safe operation and, in contrast to techniques that use a sensing resistor in the power feed, generates no waste heat or losses.

The CAB takes the form of a small panel-mounted module measuring 71 x 52 x 21mm, excluding mountings, that has an aperture through which the primary (battery feed to the vehicle motors) conductor passes. It operates from the vehicle's 12V power supply, and is rated for operation from -40 to +105�C. The CAB transducer transmits its data to the EV/HEV's control circuitry using the automotive-industry standard CAN bus; LEM can supply variants that deliver data via other bus and interface standards, on request.

In the CAB transducer, LEM chose to use its proven implementation of the fluxgate principle. Fluxgate transducers use an advanced magnetic current-measurement principle that inherently cancels or nulls many of the offset and drift errors that appear in simpler current-sensing techniques.





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