Method for pulse width modulation

Method for generating a control signal by pulse modulation according to a reference signal, the method comprising forming successive modulation sequences, each sequence comprising a transition between a low state and a high state or vice versa, the method comprising the following iterations, each iteration being associated with a current instant:

• a) calculating a time derivative of the reference signal, the time derivative being associated with a current modulation sequence corresponding to the current instant;
• b) according to the time derivative of the reference signal calculated in a), defining the current sequence, such that:
• when the derivative is positive, the current sequence comprises a high state preceded by a low state, the high state extending up to the end of the current sequence;
• when the derivative is negative, the current sequence comprises a high state followed by a low state, the low state extending up to the end of the current sequence;
• the low state and the high state extending over a low state duration and a high state duration respectively, the current sequence extending from the current instant, over a sequence duration;
• c) taking into account a high level, corresponding to the high state, and a low level, corresponding to the low state, the high level being strictly greater than the low level;
• d) according to the amplitude of the reference signal and the high and low levels taken into account in c), determining the duration of the high state or the duration of the low state of the current sequence defined in step b);
• e) reiterating steps a) to e), by incrementing the current instant by a duration equal to the duration of the sequence resulting from d), or stopping the iterations;
• the method further comprising:
• generating the control signal, according to the modulation sequences defined in steps d) of the different iterations.