Electronic control unit for vehicle with integrated cut-off

A disconnection module for an electronic control unit of a motor vehicle, said electronic control unit comprising:

• at least one power supply input designed to receive a voltage of between 10 and 15 V from an electrical power supply battery,
• a so-called “high-voltage” block comprising a plurality of so-called “high-voltage” electrical elements which are configured to be powered by said battery voltage via at least one high-voltage power supply line, each high-voltage power supply line comprising an electrical safety member designed to open said high-voltage power supply line when the voltage across its terminals exceeds a predetermined safety threshold, said high-voltage block being configured to convert the battery voltage into at least one regulated low voltage of between 1 and 5 V,
• a so-called “low-voltage” block comprising a plurality of so-called “low-voltage” electrical elements which are configured to be powered by the at least one regulated low voltage delivered by the high-voltage block on at least one electrical link connecting the high-voltage block and said low-voltage block,
• the disconnection module being configured to be electrically connected to the at least one electrical link, to determine a difference (Δ) between the voltage measured on the at least one electrical link and a reference voltage (Vref) and to command the triggering of the electrical safety members when the determined voltage difference is greater than a predetermined breakdown threshold,
• at least one switch configured to be electrically connected, on the one hand, to the at least one high-voltage power supply line, between the electrical safety member and the high-voltage block, and, on the other hand, to a ground,
• a comparator configured to receive the voltage from the at least one electrical link at an input, to compare said voltage with the reference voltage and to provide, as output, a control voltage for closing the at least one switch, and
• a locking circuit comprising an autonomous power supply to keep the at least one switch closed at least for a predetermined duration when the at least one switch is no longer powered by the output voltage of the comparator.