Power converter

Patent metadata

Field	Value
Publication number	US-2016248349-A1
Application number	US-201615046173-A
Country	US
Kind code	A1
Filing date	Feb 17, 2016
Priority date	Feb 19, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A power converter a controller that includes an instruction calculator calculating a first voltage instruction value that is applied to a first winding group, for example. An application voltage to the first winding group is controlled, for example, in a first period so that a first neutral point voltage shifts below a center-of-output value of an outputtable range is outputted, and a second neutral point voltage shifts above the center-of-output value of the outputtable range. The instruction calculator calculates the first instruction value for enabling a switching between the periods, after a lapse of a switch period that is variably calculated based on a preset physical quantity. In such manner, a ripple of a torque or an electric current accompanying the switching between the periods is reduced.

First claim

What is claimed is:

1 . An electric power converter for converting an electric power supplied to a rotation electric machine that has a first winding group and second winding group, the power converter comprising:
a first inverter having a first switching element corresponding to plural phases in the first winding group; a second inverter having a second switching element corresponding to each of plural phases in the second winding group; and a controller that includes an instruction calculator calculating a first voltage instruction value that is applied to the first winding group, and a second voltage instruction value that is applied to the second winding group, wherein an application voltage to the first winding group is controlled (i) in a first period so that a first neutral point voltage shifts below a center-of-output value of an outputtable range is outputted, and a second neutral point voltage shifts above the center-of-output value of the outputtable range and (ii) in a second period so that the first neutral point voltage shifts above the center-of-output value of the outputtable range, and the second neutral point voltage shifts below the center-of-output value of the outputtable range, and the instruction calculator calculates the first instruction value and the second instruction value for enabling a switching between the first period and the second period, after a lapse of a switch period that is variably calculated based on a preset physical quantity.

2 . The electric power converter of claim 1 , wherein
the preset physical quantity comprises a rotation speed of the rotating electric machine.

3 . The electric power converter of claim 1 , wherein
the preset physical quantity comprises an electric current flowing in at least one of the first winding group and the second winding group.

4 . The electric power converter of claim 1 , wherein
the preset physical quantity comprises a voltage applied to at least one of the first winding group and the second winding group.

5 . The electric power converter of claim 1 , wherein
the preset physical quantity comprises a torque of the rotating electric machine.

6 . The electric power converter of claim 1 , wherein
the preset physical quantity comprises a temperature of at least one of the first inverter and the second inverter.

7 . The electric power converter of claim 1 , wherein
the switch period is calculated by avoiding a resonance range that includes a time conversion value of a system resonance frequency regarding a system in which the rotating electric machine is installed.

8 . The electric power converter of claim 1 , wherein
the switch period is calculated by avoiding a human audible range that corresponds to a frequency range audible by human being.

Assignees

• Denso Corp

Inventors

• Kano Ryo
• Suzuki Takashi

Classifications

• H02P6/10 Primary

  Arrangements for controlling torque ripple, e.g. providing reduced torque ripple · CPC title

• H02P29/0088

  Electricity · mapped topic

• H02P21/05

  specially adapted for damping motor oscillations, e.g. for reducing hunting · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• H02P21/06

  Rotor flux based control involving the use of rotor position or rotor speed sensors · CPC title