Patent ID: 8547671

Claim:
An electronic device comprising: input means having a first input terminal for receiving an expected positive polarity of an input DC power supply voltage; output means having a first output terminal for delivering the positive polarity of an output DC power supply voltage; and protection means for protecting against a polarity reversal of the input DC power supply voltage coupled between the input means and the output means, the protection means including the following integrated components: an N-channel main transistor , the source of which is coupled to the first input terminal and the drain of which is coupled to the first output terminal, command means configured to render the main transistor blocked in the event of a polarity reversal and conducting otherwise, and control means configured to dynamically adjust the bias of substrate regions of respective components connected to the main transistor by connecting the substrate regions either to the source or to the drain of the main transistor according to the value of the voltages present at the source and the drain of the main transistor and the type of conductivity of the substrate regions.