A protection device for a vehicle electrical system, including a battery pack having at least one contactor. A microcontroller generates a test pulse at a pulse output thereof and a sense input terminal. The microcontroller has at least one output coupled to the control terminal of the at least one contactor. A first capacitor has a terminal coupled to a first terminal of the at least one contactor; a second capacitor having a terminal coupled to a second terminal of the at least one contactor; and circuitry coupled between the microcontroller and the first and second capacitors. The circuitry reflects the test pulse to the sense input terminal if each contactor is open when the microcontroller applies a contactor opening voltage to the contactor control terminal, and presents a signal different from the reflected test pulse to the sense input terminal of the microcontroller if any contactor is welded shut.
Electric current protection circuit and method of using same
08.06.2021
Patent
Elektronische Ressource
Englisch
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