Engine power supply circuit, and flight control member provided with such a circuit
View Patent ↗A power supply circuit for an electric motor, the circuit comprising a plurality of inverter bridge arms, each having means for connection to a respective winding of the motor, each inverter bridge arm comprising in series a first insulated gate bipolar transistor and a junction field effect transistor that are connected to a controller, the circuit including a second insulated gate bipolar transistor connected in series with each field effect transistor and connected to the controller, and a damping resistor connected in parallel with the second bipolar transistor. An aircraft flight control member including a movable airfoil associated with at least one drive motor connected to such a power supply circuit.
1. A power supply circuit for an electric motor, the circuit comprising a plurality of inverter bridge arms, each having means for connection to a respective winding of the motor, wherein each inverter bridge arm comprises in series a first insulated gate bipolar transistor and a junction field effect transistor that are connected to a controller, and wherein the circuit includes a second insulated gate bipolar transistor connected in series with each field effect transistor and connected to the controller, and a damping resistor connected in parallel with the second bipolar transistor, the controller is arranged to put the power supply circuit in an active mode and a passive mode so that:
in the active mode, the first insulated gate bipolar transistor and the first junction field effect transistor are controlled to power the windings of the motor in succession, while the second first insulated gate bipolar transistor is kept closed by the controller in order to short circuit the damping resistor;
in the passive mode, all of said insulated gate bipolar transistors are naturally open in the absence of any power supply, with the first junction field effect transistor naturally remaining closed in the absence of any power supply in order to connect the windings of the motor to the damping resistor.
2. A circuit according to claim 1 , including input means for connection to a DC network and associated with a cutout arranged to isolate the power supply circuit from the network when power is being dissipated in the damping resistors.
3. A circuit according to claim 1 , including at least one independent electronic circuit connected to the windings in parallel with the second bipolar transistors and the field effect transistors, said at least one independent electronic circuit being arranged to control the second bipolar transistors continuously or intermittently, thereby increasing damping.
4. An aircraft flight control member including a movable airfoil associated with at least one drive motor connected to the power supply circuit according to claim 1 .