What is EV Contactor?
The Electric Vehicle Contactor is an electrical control device integrated into automated control circuits. Functioning as an “intelligent control switch,” it employs a small current to govern the operation of a larger current. As a result, the EV Contactor serves the critical functions of automatic regulation, safety protection, and circuit conversion within the electric vehicle’s electrical system.
Common Structure of A Ceramic DC Contactors
The Core Manufacturing Processes of HVDC Ceramic Contactors
Ceramic component brazing process:
We have mature ceramic vacuum brazing and Tunnel furnace brazing process. The core process and production cycle could be controlled by ourselves.
Gas-filled sealing process:
Achieving aviation-grade high vacuum levels, our product minimizes residual gas, ensuring unparalleled stability in electrical performance and an extended product lifespan. Our products benefit from a high-purity blend of hydrogen and helium gases, ensuring optimal performance while accurately detecting even the minutest product micro-leakages.
Laser welding process:
The laser welding process has widely adopted the mainstream laser penetration welding technology, which, after extensive practical validation, ensures a mature, stable, and reliable process, providing excellent sealing performance for the product.
Iron Core Spot Welding Process:
Utilizing the argon arc welding technique to firmly weld the iron core with the push rod, our spot welding process ensures reliable and stable weld points. This method guarantees the mechanical longevity and performance of the product.
The Working principle of HVDC Ceramic Contactors
Control Signal:
The EV contactor operates in response to a control signal, typically an electrical input (such as voltage or current), received from a control system or circuit specific to electric vehicle applications.
Electromagnetic or Electronic Operation:
Upon activation by the control signal, the internal mechanism of the EV contactor, whether electromagnetic or electronic, initiates the switching action required for the opening or closing of the circuit.
Contact Engagement:
The internal contacts or switching mechanism of the EV contactor respond to the control signal, facilitating the establishment or interruption of the connection. This allows for the controlled flow or cessation of high-voltage power within the electric vehicle system..
Insulation and Durability:
EV contactors are designed with robust insulation and high voltage endurance to mitigate the risk of arcing or breakdown. This design ensures the reliable and safe control of the high-voltage direct current circuit in electric vehicle applications.
How to Select Your HVDC Ceramic Contactors?
Ensure that the rated operating voltage of the EV contactor aligns with the voltage specifications of the electric vehicle system.
Choose an EV contactor with ample carrying capacity to meet the current load demands of the electric vehicle system.
Determine the expected short-circuit current in the electric vehicle system and select an EV contactor capable of handling this current safely.
Consider the pre-charging resistance, pre-charging time, and pre-charging current in the electric vehicle system. Choose an EV contactor that facilitates a stable pre-charging process.
Determine the required turn-on life based on voltage differences and current during turn-on. Select an EV contactor with an appropriate life expectancy.
Consider abnormal conditions in the electric vehicle system that may require cutting off with a load. Select an EV contactor with a suitable cut-off life.
Based on the installation location and application environment within the electric vehicle, choose an EV contactor capable of adapting to mechanical vibration and shock.
Consider the operating temperature environment of the EV contactor and select a contactor that can function effectively under those conditions.
Factor in the rated voltage of the coil drive power supply, stability of the power supply, and power supplied to meet the coil control requirements specific to the EV contactor.
