Overvoltage protection circuit for 14 Volt branch of 42 Volt/14 Volt vehicle on-board electrical system has switch that switches output to earth if short between 14, 42 Volt branches

摘要

The circuit has a switch (SE) in the power electronics (LE) supplying the 14 Volt branch, whose input is connected to the 42 Volt branch, which switches to earth its output to the 14 Volt branch if there is a short circuit between the 14 and 42 Volt branches and trips a breaker in the 14 Volt branch or the 42 Volt branch. The switch can be part of a controller (SG) connected to the 14 Volt branch via a supply line.