Patent ID: 7551463

Claim:
An AC/DC voltage converter with low anharmonic currents and using switch-mode regulation of a rectified current coming from a power supply source of alternating electric current, comprising: a rectifier; at least one controlled switch; an error corrector configured to detect an output voltage error; a peak current maximum set point generator configured to generate a limitation setpoint of peak current as a function of an instantaneous voltage from the power supply source; and a control device configured to control the at least one controlled switch using switching cycles with variable duty cycle adjusted in such a manner as to cancel the detected output voltage error and to maintain the limitation setpoint of peak current, said control device comprising an oscillator equipped with a pulse-width modulator PWM controlled by the error corrector in order to cancel an output voltage error, and a logic circuit inserted into the output of the pulse-width modulator PWM to ensure the disabling of the at least one controlled switch each time an instantaneous current flowing through the at least one controlled switch exceeds the limitation setpoint of peak current; wherein the peak current maximum setpoint generator ( 9 ) generates a peak current limitation setpoint which is a spline function, by parts, of the instantaneous voltage from the power supply source meeting the definition: I pmax — peak =k i V in — inst +b i i integer varying from 1 to n n being the number of parts of the spline function defined by successive ranges of variations of the instantaneous voltage V in — inst from the power supply source, an i-th part corresponding to the range: ( V in — inst ) Max(i−1) ≦V in — inst ≦( V in — inst ) Maxi ( V in — inst ) Max0 =0, (V in — inst ) Maxi being the value of a transition between the i -th and (i+1) -th — parts and k i and b i being constants whose values depend on the part i.