Control of electric heating circuits, especially for automobiles

摘要

According to the invention, an apparatus (1) for controlling an electric heating circuit (2) comprising N heating elements (21-23) connected in parallel, each comprising N heating elements (21-23). A module suitable for receiving an output set value in the form of N electronic switches (T1 to T3) that can be connected in series to one of them and a control signal (PWM) with a duty cycle that varies according to the output (10), means (12) for extracting the average value (/ PWM) of the received control signal (PWM), the extracted average value (/ PWM) and P individual threshold values (Ref1 to Ref1) Ref3) and P comparators (C1 to C3) suitable for generating P comparison signals (S1 to S3), each comparison signal corresponding to at least one heating element Open the attached electronic switch (T1-T3) or Comprises P number of comparators which the control for switching to the position and (C1 to C3).