Abstract: Voltage conversion module including a high-voltage terminal, low-voltage terminal, ground terminal, an inductor, and a switching arm having a high-side switch and a low-side switch connected at a mid-point. The switching arm is connected between the high-voltage terminal and the ground terminal, the mid-point is electrically connected to the low voltage terminal via the inductor and a device for controlling the switches. The conversion module further includes a device for detecting failure of the high-side switch including a voltage generator having two input terminals and an output terminal and being configured to receive on one of its input terminals voltage of the mid-point, and on the other of its input terminals first reference voltage, and to generate on its output terminal an increasing voltage from a predetermined voltage lower than a threshold value provided that the voltage of the mid-point is higher than or equal to the first reference voltage.