CONTROL CIRCUIT AND METHOD FOR CONTROLLING A MULTIPHASE MOTOR

摘要

A circuit for controlling a multiphase SRM motor, comprising for each winding a low-side and a high-side transistor, and a low-side and a high-side diode for, and at least one current sensor, e.g. a single current sensor, arranged in low-side or high-side implementation for measuring a current through a first and second winding, and a controller adapted for configuring the transistors such that: during a first time slot only the first winding is energized while the second winding is freewheeling via a selected freewheeling path, during a second time slot only the second winding is energized while the first winding is freewheeling via a selected freewheeling path, and measuring the first and second current in said time slots. A method of driving said transistors.

主权项

1. A circuit for controlling a multiphase motor, the motor comprising a plurality of windings comprising at least a first winding and a second winding, the circuit comprising:
for each winding a low-side transistor and a high-side transistor for allowing the windings to be energized; for each winding a low-side diode and a high-side diode for allowing the winding to freewheel from the low-side to the high-side when said winding is not being energized; at least one current sensor arranged in low-side implementation and/or arranged in high-side implementation for selectively measuring a first current running through said first winding and a second current running through said second winding; a controller adapted for repeatedly configuring the transistors in such a way that:
during a first time slot only the first winding is energized, while the second winding is freewheeling via a freewheeling path chosen such that only the first current of the first winding or only the second current of the second winding is flowing through said at least one current sensor;during a second time slot only the second winding is energized while the first winding is freewheeling via a freewheeling path chosen such that only the other of the first and second current is flowing through the current sensor; and wherein the controller is further adapted for measuring one of the first and second current during said first time slot using said current sensor, and for measuring the other of said first and second current during said second time slot using said current sensor.