A circuit for controlling inductive loads, in particular of electro actuators, at high efficiency

摘要

The control circuit (1) comprises a source of dc voltage (B), a first electronic switch (M1), interposed between a first terminal (2) of the voltage source (B) and a corresponding first terminal (4) of the load (L1), a second electronic switch (M2), interposed between the other or second terminal (5) of the load (L1) and the other or second terminal (GND) of the source (B), a current recirculation device (M3, d3), including a diode (d3) connected between the said first terminal (4) of the load (L1) and the other or second terminal (GND) of the voltage source (B) to allow a circulation current in the load (L1) when the first switch (M1) is open, and a control circuit (ECU) arranged to control the switches (M1, M2, M3) in a predetermined manner. The recirculation device further includes a third electronic switch (M3) disposed between the first terminal (4) of the load (L1) and the other or second terminal (GND) of the voltage source (B), and the control unit (ECU) is arranged to control this third switch (M3) in a synchronous manner, but in phase opposition, in relation to the first switch (M1).