Switching interference suppression in motor driving circuits using space vector pulse width modulation (PWM)

摘要

Circuits and methods for driving a load are disclosed. An exemplary driving circuit may include a plurality of switching devices and a controller electrically connected to the plurality of switching devices. The controller may be configured to provide a switching signal for controlling switching operations of the switching devices. The controller may also be configured to determine whether the switching signal falls within a predetermined dead zone. When it is determined that the switching signal falls within the predetermined dead zone, the controller may be configured to modify the switching signal by moving a space vector corresponding to the switching signal to a boundary of the predetermined dead zone. In addition, the controller may be configured to provide the modified switching signal to the switching devices.

主权项

1. A driving circuit for driving a load, comprising:
a plurality of switching devices; and a controller electrically connected to the plurality of switching devices, wherein the controller is configured to:
provide a switching signal for controlling switching operations of the switching devices;determine whether the switching signal falls within a predetermined dead zone, the predetermined dead zone having a lower limit and a higher limit;when it is determined that the switching signal falls within the predetermined dead zone, modify the switching signal by moving a space vector corresponding to the switching signal to a boundary of the predetermined dead zone; andprovide the modified switching signal to the switching devices; wherein the controller is configured to determine whether the switching signal falls within the predetermined dead zone by:
determining whether a decomposition coefficient of the space vector corresponding to the switching signal is between the lower and higher limits, the decomposition coefficient corresponding to a proportion of the space vector decomposed along a boundary of a sector in which the space vector is located, wherein the sector is defined by two adjacent switching vectors corresponding to two different switching states of the plurality of switching devices; anddetermining that the switching signal falls within the predetermined dead zone when it is determined that the decomposition coefficient of the space vector corresponding to the switching signal is between the lower and higher limits.