405 SE EVERETT MALL WAY 2025-06-24

SUPERCHARGER SAFETY MECHANISMS T _ rS L n or vehicle fails to receive a signal from the other party within the expected heartbeat window, charging stops within milliseconds. Isolation Test The Supercharger system tests the isolation of the DC positive and negative conductive paths to the vehicle after the initial digital handshake. It also continuously monitors isolation during the charge session. The test monitors the isolation between DC positive and GND, and DC negative and GND. If isolation is below a critical threshold, the Supercharger will stop drawing power and open all contactors, halting charging operation in less than 100 milliseconds. Short-Circuit Test After passing the isolation test, the Supercharger applies a voltage to the high voltage DC pins on the connector, opens its internal contactors, and monitors the decay time. If the voltage decays faster than a specified threshold, it indicates a potential short and the Supercharger system stops the charging initialization process. Contactor Functionality Test While performing the isolation and short-circuit tests, the Cabinet checks that it can properly control all contactors and monitors a hardware aux line within the contactors for potential welds, opens, or other failures. For example, the short- circuit test requires opening the internal contactors, and if they fail to open, the Supercharger system will stop drawing power and open all other contactors, and not proceed with energization. Voltage Matching before Vehicle Contactors Close The Supercharger system matches the cabinet output voltage(s)to the battery pack(s) of any connected vehicles before the vehicle contactors close. The vehicle's battery pack voltage is communicated to the Supercharger system by the vehicle's on-board battery management system (BMS). Once the voltages match within a certain tolerance, current begins to flow. Temperature Sensing During charging, the Supercharger system monitors the temperature of the handle on the EV Connector to ensure that users can safely touch the EV connector. If the handle temperature is too high, the Supercharger firmware will reduce current delivery to manage temperature. If the temperature rises even higher and hits a second threshold, a hardware trip will stop charging within milliseconds. The Supercharger system also monitors temperature within the Cabinet and sets coolant pump and fan speed duty cycle to keep the cabinet in the operational temperature range during and after vehicle charging. Rev. 1.0, September 2018 CONFIDENTIAL INFORMATION-SHARED UNDER NDA ONLY Page 7 of 8