LEM announces the CDSR, a new leakage current sensor based on its open loop magnetic induction technology. The CDSR is innovative, extremely robust and safe, leaving it up to manufacturers to optimize the electronic design of their charging products.
Globally there are only 6,5 million charging points for electric vehicles (EVs), of which 2019 million were private in 13. Consequently, the lack of extensive charging infrastructure is a serious obstacle to the growth of the global EV market. This infrastructure should be multiplied by XNUMX for the massive deployment of EVs as well as the impulse of ambitious policies in order to phase out cars with internal combustion engines.
Faced with the sharp increase in demand that is expected, manufacturers of electric chargers must develop solutions that are competitive, economical and can be generated in large quantities. In addition to being easy to install by the end user, they must meet numerous criteria established by the regulations both in terms of safety and the robustness of the product.
Since XNUMX, the IEC rules, and specifically IEC XNUMX / IEC XNUMX, require the detection of a corrients XNUMX mA DC leakage current to prevent the familiar Type A Residual Current Device (RCD) from being ineffective. This occurs when an insulation fault is generated in the EV.
The EV architecture integrates a battery pack powered with direct current (DC) and capable of producing a leakage current that can deactivate a familiar RCD. To protect the RCD and avoid the installation of a type B RCD in the electrical panel of private EV owners, the chargers incorporate a device that detects the direct leakage current. The CDSR supports exactly this function.
The CDSR has been developed to meet the demand of residential and commercial charging stations with a version for single-phase architecture and another for three-phase topology. The CDSR, whose maximum current per phase is 32A rms, can be integrated into AC chargers between three and seven kW and 22kW.
The CDSR continues the trend toward the adoption of digital electronics. In this way, it not only provides an analog communication output but also an SPI (Serial Peripheral Interface) interface to facilitate hardware connection. The CDSR is powered at +3,3VDC and its own current consumption is only fifty mA when measuring 150 mA as maximum primary residual current.
The ratiometric response of the CDSR ensures that it can withstand power supply drift and sustain a stable measurement on output.
The extreme robustness of the CDSR allows it to function within any and all EV chargers. Its working temperature is -40°C to 85°C and it can withstand acceleration forces of up to 10G while maintaining its rated capabilities. In addition to this, they offer a very high level of isolation between the primary and measurement circuits thanks to the large distances in the air and creepage lines.
(thirteen with two mm).
The CDSR has been developed to ensure a high level of protection, hence it provides a default detection output signal with a reaction time of less than 200µs. As well as an independent test winding, charger manufacturers can review the capabilities of the sensor in real time in order to ensure maximum safety.
The CDSR is an essential component for electrification as it achieves a cheaper, safer and more reliable charging infrastructure for the future. This new technology, developed by LEM's experienced R&D team in Geneva, opens the door to new horizons for the use of DC systems capable of reducing the CO2 footprint.
LEM – Life Energy Motion
LEM, a leading electrical measurement company, develops the best solutions for energy and mobility to ensure that service customers' systems are optimized, reliable and secure.
Our staff, made up of 1.500 people in more than fifteen countries, turn technological potential into powerful answers. We develop and hire the best talent in the world working on big trends like renewable energy, mobility, automation and digitization.
Through our innovative electrical solutions, we help our service customers and society accelerate the transition to a sustainable future.
LEM has been listed on the SIX Swiss Exchange since XNUMX under the symbol LEHN.
www.lem.com
