| 摘要 |
<p>System for regulating the mean current flowing through a load (1), particularly an electric device controlling the phenomenon to be regulated, from initial variable control information ( alpha ), a DC voltage source (Valim) being provided for supplying this load, comprising: a measuring device (4) for permanently measuring the value of the variable information ( alpha ); a determination device (5, 6) for causing a mean theoretical current value to be applied to the load (1) to correspond to each value of the information ( alpha ); a further measuring device (7) for measuring the real DC voltage supplied by the supply voltage source; a computing device (8) for computing, from the determined value of the mean theoretical current and the measured value of the DC supply voltage, a theoretical value of the cyclic ratio (pwm) of a pre-determined fixed frequency square wave voltage signal; a generator (2) for generating a fixed frequency square wave voltage signal having the computed cyclic ratio, this signal being applied to the load; another measuring device (10) for measuring the real mean current flowing through the load; a comparator (11) for comparing the values of the real and theoretical mean currents and generating an error signal ( epsilon ); and a correcting device (9) for correcting the theoretical value of the cyclic ratio as a function of the error signal.</p> |
