A power conversion device comprising a power converter (CONV) comprising power switches and intended to deliver a set of at least one AC phase, a control device intended to generate commands intended to switch the power switches between an off-state and an on-state, and a protective device comprising: - a set of at least one sensor (C1, C2, C3), each sensor in the set of at least one sensor making it possible to deliver a measurement (m1, m2, m3) representative of the instantaneous current delivered at the output of the power converter (CONV) on a phase of the set of at least one phase, - a protective device connected to the control device and to the power converter (CONV) such that the commands generated by the control device are transmitted to the power converter via the protective device, the protective device receiving the measurement representative of the instantaneous current delivered by the set of at least one sensor, the protective device being configured to inhibit the commands delivered by the control device when the absolute value of the measurement representative of the instantaneous current and delivered by at least one sensor of the set of at least one sensor exceeds a predetermined first threshold such that the power switches of the power converter (CONV) are kept in the off-state, characterised in that the power conversion device comprising a regulator configured to determine a duty cycle for a predetermined chopping frequency and a predetermined target current, the control device being configured to generate the commands intended to switch the power switches at the chopping frequency with the duty cycle, the regulator receiving the measurement delivered by each sensor of the set of at least one sensor and being further configured to: - determine the duty cycle from a value of the target current at a predetermined reference current, when the absolute value of the measurement representative of the instantaneous output current and delivered by each sensor of the set of at least one sensor is less than or equal to a third threshold which is less than the first threshold and the second threshold, and to determine the duty cycle from a value of the target current which is equal to a protective current which is less than the reference current, when the absolute value of the measurement representative of the instantaneous output current and delivered by at least one sensor of the set of at least one sensor is greater than the third threshold, - and/or set the value of the chopping frequency at a predetermined reference chopping frequency, when the absolute value of the measurement representative of the instantaneous output current and delivered by each sensor of the set of at least one sensor is less than or equal to a third threshold which is less than the first threshold and the second threshold, and set the chopping frequency at a protective chopping frequency, when the absolute value of the measurement representative of the instantaneous output current and delivered by at least one sensor of the set of at least one sensor is greater than the third threshold. - a set of at least one sensor (C1, C2, C3), each sensor in the set of at least one sensor making it possible to deliver a measurement (m1, m2, m3) representative of the instantaneous current delivered at the output of the power converter (CONV) on a phase of the set of at least one phase, - a protective device connected to the control device and to the power converter (CONV) such that the commands generated by the control device are transmitted to the power converter via the protective device, the protective device receiving the measurement representative of the instantaneous current delivered by the set of at least one sensor, the protective device being configured to inhibit the commands delivered by the control device when the absolute value of the measurement representative of the instantaneous current and delivered by at least one sensor of the set of at least one sensor exceeds a predetermined first threshold such that the power switches of the power converter (CONV) are kept in the off-state, - determine the duty cycle from a value of the target current at a predetermined reference current, when the absolute value of the measurement representative of the instantaneous output current and delivered by each sensor of the set of at least one sensor is less than or equal to a third threshold which is less than the first threshold and the second threshold, and to determine the duty cycle from a value of the target current which is equal to a protective current which is less than the reference current, when the absolute value of the measurement representative of the instantaneous output current and delivered by at least one sensor of the set of at least one sensor is greater than the third threshold, - and/or set the value of the chopping frequency at a predetermined reference chopping frequency, when the absolute value of the measurement representative of the instantaneous output current and delivered by each sensor of the set of at least one sensor is less than or equal to a third threshold which is less than the first threshold and the second threshold, and set the chopping frequency at a protective chopping frequency, when the absolute value of the measurement representative of the instantaneous output current and delivered by at least one sensor of the set of at least one sensor is greater than the third threshold.