Speed controller including a device for protection against overcurrents and overvoltages

摘要

The drive (1) has a protection device (14) for protecting the drive against overcurrent related to variations in voltage on an electrical supply system (A). The device includes a junction gate FET (T1) made of a silicon carbide material and placed on a power bus with positive and negative lines (10, 11) in series between a rectifier module (12) and a bus capacitor (Cb). The device includes MOSFET (T2) made of a silicon carbide material and mounted on the power buses in parallel with the FET (T1) and a control unit (140) for controlling the FET and the MOSFET.