News Article

LEM Launches New Leakage Current Sensor For Electric Vehicle Charging Stations


A global company in electrical measurement for industry and automotive applications, launches the CDSR, a new leakage current sensor based on its open-loop Fluxgate Technology. The CDSR is innovative, extremely compact and safe, allowing manufacturers to optimize the electronic design of their charger products.

With a worldwide total of only 7.3 million EV charging points, of which 6.5 million were private in 2019, the lack of an extensive charging infrastructure is a key impediment to the growth of the global electric vehicle market. To support the massive deployment of EVs, driven by ambitious policies to phase out sales of internal combustion engine (ICE) vehicles, the charging infrastructure must increase by thirteen times.

Due to this high expected demand, manufacturers of electric chargers must develop solutions that are competitive, affordable and capable of being industrialized at high volume. As well as being easy to install for the end user, they must meet many standard criteria, both for safety and robustness of the product.

Since 2016, IEC standards and more specifically IEC 62955 / IEC 62752, require the detection of a Direct Leakage current at 6 mA DC to avoid the home Residual Current Device (RCD) Type A being ineffective. This effect, called “the blinding effect”, appears when an EV develops an insulation fault.

EV architecture integrates a battery pack, powered by Direct Current (DC), which can generate a leakage current that can deactivate a home RCD. To protect the RCD and avoid the need to install an RCD type B in the electrical panel of home EV owners, EV chargers include a device to detect the DC leakage current. This detection is the role of the CDSR.

The CDSR has been developed to meet market demand for a residential and commercial charging station, offering a version for single-phase architecture and another for three-phase topology. With a maximum current per phase of 32A rms, the CDSR can be integrated into AC chargers from 3.7 kW to 22kW.

Following the trend towards digital electronics, the CDSR provides not only an analog communication output but also a Serial Peripheral Interface (SPI), enabling simple interfacing of hardware. The CDSR operates from a +3.3VDC supply and has a typical current consumption of just 50 mA when measuring 150 mA as a maximum primary residual current.

The ratio-metric behaviour of the CDSR ensures it can resist power supply drift and maintain a stable output measurement.

Extremely robust, the CDSR can operate inside all EV chargers. It has an operating temperature between -40°C to 85°C, can withstand acceleration forces up to 10G while maintaining nominal performance, and has a very high level of insulation between its primary and measurement circuits, thanks to long creepage and clearance distances (13.2 mm).

Designed to ensure a high level of safety, the CDSR provides a default detection output signal with a reaction time below 200µs. Combined with an independent test winding, charger manufacturers can test the performance of the sensor in real time to guarantee maximum safety.

The CDSR provides an essential component of the electrification world, making charging infrastructure more affordable, safer, and reliable for the future. This new technology, developed by the experienced LEM Geneva R&D team, opens the door to new horizons using DC systems to reduce CO2 footprint.

FREYR Receives Government Low-Emission Grant From ENOVA To Support Development Of Initial Clean Battery Cell Production Facility
PINK GmbH Thermosysteme Live Web Seminar: Cost-efficient Production Of Power Modules
Infineon Announces 650V CoolSiC Device For Cars
GaN Power Transistors Drop Below $1.00
EPC Announces Lidar Demo Board
Teledyne E2v HiRel And Integra Partner On High Voltage GaN Devices
LEM Launches New Leakage Current Sensor For Electric Vehicle Charging Stations
GaN Systems & Silanna Release Charger Reference Design
Volkswagen Shows Off A New Way To Recycle And Reuse EV Batteries
Toshiba's Announces Five 650V Superjunction Power MOSFETs Housed In The New TOLL Package
Vendor View - GTAT's Pure Play On Silicon Carbide Crystal
CoolGaN HEMT Helps Deliver High Efficiency In Telecoms
UnitedSiC Launches FET-Jet Calculator
Strong Growth For GaN And SiC In 2021
Magna Leverages Cloud Connectivity And Advanced E-mobility Innovations To Decrease Emissions And Increase Range
Transphorm Q4: A Strong Finish To The Year
Mitsubishi Electric To Launch 80x60 Pixel Thermal Diode Infrared Sensor
Verkor And Aura Aero Join Forces To Develop A Battery For Electric Aviation
New Inertial Sensor For High-performance Motion Detection
SGL Carbon Receives €42.9 Million Funding Under IPCEI For Graphite Anode Materials (GAM) In Lithium-ion Batteries
Conductivity Modulation In Vertical GaN PiN Diode
Toshiba Announces Compact SiC MOSFET Module
SiC Now Walking The EV/HEV Red Carpet
Mercedes-Benz Drive Systems Campus: Stuttgart-Untertürkheim Gears Up For “Electric First” Future

Search the news archive

To close this popup you can press escape or click the close icon.
Register - Step 1

You may choose to subscribe to the Power Electronics World Magazine, the Power Electronics World Newsletter, or both. You may also request additional information if required, before submitting your application.

Please subscribe me to:


You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
{taasPodcastNotification} Array
Live Event