Valve actuator driving device with stabilized current

Valve actuator system includes computer. Circuit for stabilizing supply current provided by battery is placed between 12 volt vehicle battery (4) and computer. Circuit has boost type power chain (2) with inductance (10), diode (11), static interrupter (13) and capacitor (12), and current control loop (15). Current control loop controls current applied to input of static interrupter as function of output voltage of chain, current in chain and reference provided by computer. The control loop serves to limit the output voltage of the power chain.