LEM Automotive is specialized in developing and manufacturing current transducers for battery management and motor drive applications in cars, buses and trucks. By controlling the current in energy-intensive applications, LEM participates in the global effort to reduce overall energy consumption.

Typical applications for automotive transducers include:

• · Standard battery monitoring

• · Hybrid and EV battery pack current sensing

• · Fuel cell current control

• · DC/DC converters and AC/DC inverters

• · Hybrid and EV motor inverter drive

• · EPS and X-by-wire applications

• · Electric compressors for air conditioning

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1. APPLICATIONS FOR AUTOMOTIVE BATTERY MANAGEMENT

BATTERY MANAGEMENT FOR HYBRID AND EV MARKETS

The production of electric car and hybrid vehicles is increasing.
Both types of vehicle need high current capability batteries to run the 50kW or more motors and these use high voltage systems. The current sensors for these batteries need to be isolated.
Flux Gate Sensors (CAB) and Hall-effect sensors (HAH1, HSN, DHAB) are the product of choice for this application.

 

2. APPLICATIONS AUTO MOTOR CONTROL

 

Main applications for Motor Control and Energy Converter management are:

Electric and hybrid vehicle motor converter

 

Production of electric and hybrid vehicles is increasing. Both have power motors (50kW or more) and use 3 to 6 phase inverters to drive the traction and generator motors precisely and reliably. The trend is to opt for high frequency and smooth wave forms, which is fuelling demand for fast current sensors. There are two distinct market needs:

For standard products such as HC5/HC6, HAH1DRW, HAH3 family and HCx family
For a full custom solution which fits with the mechatronic approach (HAH3, HAH2 dedicated shape)

DC/DC power converters

Environmentally-friendly cars and trucks require different levels of voltage; most loads run under 12V or 24V while the traction motors need a much higher voltage. There is a need to build efficient step-up and step-down converters in the car to make these different voltages available. The tendency is to have high frequency resonant converters which need fast current transducers.

The HC5, HC6 and HAH1DRW or HAM ( high frequency bandwidth up to 300kHz) families can handle the speed needed to meet these requirements.

SINGLE-PHASE SENSORS

MULTIPHASE SENSORS