Controller for ac/dc or dc/ac multi-phase power converter
A power converter, multi-phase power supply technology, used in AC motor control, AC power input conversion to DC power output, motor generator control and other directions
Pending Publication Date: 2021-10-15
HONG KONG APPLIED SCI & TECH RES INST
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This solution is only suitable for DC-DC converters and requires N PWMs to perform current balancing
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[0033] The following descriptions are of preferred embodiments by way of example only, and are not limited to combinations of features necessary to practice the invention.
[0034]Reference in this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Furthermore, various features were described that may be exhibited by some embodiments but not by others. Similarly, various requirements are described which may be requirements of some embodiments but not others.
[0035] It should be understood that the elements shown in the drawings may be implemented in various forms of hardware, ...
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Described is a controller for an AC to DC or a DC to AC multi-phase power converter of a type having N power converter phases, where N is greater or equal to 2. The controller comprises a control module configured to change or vary a phase shift angle of the input current or output current for each of the N power converter phases such that an average phase shift value for each of said N power converter phases over a control module AC line cycle is about, near or substantially the same value. In an embodiment of an AC / DC or a DC / AC multi-phase power converter of a type having N power converter phases arranged in parallel, an advantage of arranging the average phase shift value for each power converter phase to be substantially equal or about equal over an AC line cycle is that it reduces or eliminates any imbalances in the input currents or output currents of the N power converter phases. In preferred arrangements, the control module varies the phase shift angle of the input current or the output current for each of the N power converter phases over each AC line cycle using respective PWM switch control signals.
Description
technical field [0001] The present invention relates generally to controllers for AC to DC or DC to AC multiphase power converters, and more particularly to an AC to DC or DC power converter for sharing or balancing current among multiple power converter phases Controller for AC multi-phase power converters. Background technique [0002] Traditionally, single-phase power converters have been commonly used. However, such converters are increasingly unable to meet the high power ratings and high power density requirements of many modern electronic devices. Multi-phase power converters are one of the main solutions to power rating and power density problems, but one problem encountered with multi-phase power converters is that current imbalances can occur between the phases, which can lead to power converter failure . [0003] Multiphase power converters are now widely used as power supplies for electronic equipment such as computer systems to provide a stable voltage for mi...
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IPC IPC(8): H02M7/5387H02P27/08
CPCH02M1/15H02M7/23H02M1/0043H02P2201/03H02M1/084H02P27/08H02M7/12H02M7/48
Inventor 张瑞蓬李清纯李欣李天河
Owner HONG KONG APPLIED SCI & TECH RES INST