Abstract: A method for determining an output voltage of a transistor, the transistor comprising an input electrode, a first output electrode and a second output electrode, the potential of the first output electrode being higher than the potential of the second output electrode the output voltage being the difference in potential between the first output electrode and the second output electrode. The method includes a step for measuring the evolution over time of a control voltage of the transistor, the control voltage being the difference in potential between the input electrode and the second output electrode, and determining the output voltage from the measured control voltage.

Abstract: The invention relates to a method for determining an output voltage of a transistor (10), the transistor (10) comprising an input electrode (G), a first output electrode (C) and a second output electrode (E), the potential of the first output electrode (C) being higher than the potential of the second output electrode (E), the output voltage being the difference in potential between the first output electrode (C) and the second output electrode (E), the method comprising: a step for measuring the evolution over time of a control voltage of the transistor (10), the control voltage being the difference in potential between the input electrode (G) and the second output electrode (E), and determining the output voltage from the measured control voltage.

Abstract: Power-supply apparatus for powering a control circuit for controlling a power switch component, the apparatus powering said circuit from the voltage across the terminals of the component in the off state, and including an energy-storage capacitor, said apparatus further including means for charging said energy-storage capacitor during the periods in which said component is on.