Control device employed in a switched electrical power supply syetem

摘要

The device (1) has a first transistor (T1) connected to a first input terminal (B) and provided with a gate (G) to receive control signals from a control unit (U). A second transistor (T2) is connected to a second input terminal (A) by its drain (D) and to the first transistor through its source (S). A control assembly is connected to a gate of the second transistor and to the first input terminal and includes a voltage clipping/routing device connected in series to a capacitor (Ca). A Zener diode (Dz2) is connected between the gate and the source of the second transistor. The transistor is a MOSFET or Insulated gate bipolar transistor (IGBT). An independent claim is also included for a variable speed drive to control an electrical load.