Abstract
In HV battery systems, a contactor is a high‑current, electrically controlled switch used to connect or disconnect the high‑voltage battery from the vehicle’s HV bus. Measuring the voltage difference across the two sides of the main contactor before closing it is primarily about safety and reliability: to ensure that no arcing or contact welding occurs at closure, to avoid shocks to downstream circuit, thereby reducing high‑voltage risk from potential faults.
Compared to traditional solutions, in this design, a differential sampling circuit has been used to detect the voltage across the Main positive contactor. This differential circuit has a higher accuracy to detect the Δ voltage to prevent the inrush current when closing the Main+ contactor. Meanwhile, this circuit can handle positive and negative input which is flexible.
Creative Commons License
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Recommended Citation
Anonymous, "A Differential Sampling Circuit to Detect Voltage Across Main Contactor", Technical Disclosure Commons, (March 09, 2026)
https://www.tdcommons.org/dpubs_series/9480