Abstract
In HV battery systems, contactors are controlled by a Microcontroller Unit (MCU) via a driver Integrated Circuit (DRV3946). A common issue arises when the MCU has a reset: the control signals from the MCU typically float or default to a state that disables the driver, causing contactor open unintentionally, which may have an impact on passenger driving experience. The proposed strategy is a hardware control that utilizes an independent signal from a Power management IC (PMIC) combined with a specific pull-up/pull-down circuit topology. This ensures the contactor driver remains closed during an MCU reset, while still allowing for a safety disconnect if a critical fault is detected by the PMIC.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "A control strategy to keep contactor closed during MCU reset period", Technical Disclosure Commons, (March 09, 2026)
https://www.tdcommons.org/dpubs_series/9479