Residual current, commonly known as leakage current, is an inevitable phenomenon in electrical systems. In electric vehicle charging scenarios, AC, DC, or mixed fault currents can pose fire and electric shock risks. Traditional monitoring devices often struggle to accurately detect DC components, while LEM CDT Series Sensors are designed to address this challenge.
LEM CDT Series: Professional Leakage Current Monitoring Solution
The CDT series consists of B and B+ grade residual current monitoring sensors that meet automotive-grade standards, specifically designed for precise measurement of DC, AC, and mixed AC/DC leakage currents. Its unique magnetic flux gate structure design achieves the best measurement accuracy in its class, capable of detecting leakage currents as small as 5mA.
Core Technical Advantages of the CDT Series
Exceptional Accuracy:Ultra-high precision of ±0.5mA ensures that even the smallest leakage currents can be reliably detected.
Wide Temperature Operation:Compliant with AEC-Q100 standards, it operates stably in harsh environments from -40°C to +125°C.
Flexible Configuration:Supports up to 4 conductors, with a current capacity of 48Arms, compatible with both single-phase and three-phase systems.
Dual Output:Provides SPI bus and digital trip output, enabling quick response and detailed fault information.
Compact Design:PCB mountable, saving space and facilitating integration.
Practical Application Scenarios
In the electric vehicle charging field, CDT series sensors play a crucial role:
Onboard Charger:Supports onboard chargers up to 22kW, especially in bidirectional charging applications, with versions compliant with ISO26262 ASIL B standards providing additional safety diagnostic functions.
Onboard charger block diagram
Charging Mode 2:Provides safety assurance in charging cables (IC-CPD).
Charging Mode 3:Offers reliable leakage current protection for wall-mounted chargers.
How to Ensure Current Safety and Accuracy?
CDT series sensors provide exceptional accuracy and reliability in current measurement thanks to their advanced magnetic flux gate structure. They enable precise monitoring of both DC and AC currents, effectively preventing safety issues in electrical systems caused by current leakage. This makes them indispensable safety tools across various industries, performing excellently even in low current environments.
As an authorized distributor of LEM, Fusite Technology not only offers high-quality products like the CDT series but also commits to providing professional technical support and comprehensive solutions to customers. We understand that excellent products need to be paired with professional technical services to maximize their value.
In the context of the rapid development of the electric vehicle industry, charging safety cannot be overlooked. The LEM CDT series sensors provide essential safety assurance for charging facilities with their outstanding performance and reliability.
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About Us:
Fusite Technology was established in 2008, focusing on electronic solution development and electronic component distribution, with long-term deep engagement in new energy, electric vehicles, charging piles, household appliances, and touch displays, accumulating rich project technical experience and establishing stable partnerships with several Fortune 500 companies and unicorn enterprises. The company has also independently developed products such as power modules and infrared imaging devices, widely used in industrial control, smart devices, and consumer electronics. We always adhere to the philosophy of “technological innovation empowers the future,” continuously enhancing our technical service capabilities and product competitiveness.
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