An electronic current-switching system comprising a driver unit and a current-switching device with one controlled transistor, a control unit coupled to said transistor, a power supply unit of the control unit and a digital communication bus transmitting to the control unit a first control signal of the driver unit. The power supply unit comprises: a transformer, an integrated circuit including a clock input coupled to a second output of the driver unit delivering a second control signal having the form of a pulsed signal with an adjustable duty cycle, and an output delivering to the transformer a primary voltage signal dependent on the second control signal, and a voltage divider bridge measuring the frequency-domain signal delivered by the transformer.