The invention relates to a circuit device (10) for driving an AC electric load (3), of the type inserted between a terminal of an AC power supply line and a terminal of the electric load to be driven and including a generator (8) of PWM signals to be transferred to the load. This circuit comprises first and second associated switches (Q1, Q2) for driving respective terminals (A, A') of the load (3), and a third switch (Z3) voltage driven by a signal (Vcontrol) from the PWM generator (8), the third switch (Z3) being used for driving the first and second associated switches (Q1, Q2) through respective first and second transformers (T1, T2) and to enable loop-back of the current..
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