Control apparatus for electric power conversion apparatus

Patent metadata

Field	Value
Publication number	US-11418128-B2
Application number	US-202017106283-A
Country	US
Kind code	B2
Filing date	Nov 30, 2020
Priority date	May 29, 2018
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A control apparatus is provided for controlling an electric power conversion apparatus. The electric power conversion apparatus includes a reactor and a drive switch and is configured to convert one of an AC voltage and a DC voltage into the other of the AC voltage and the DC voltage. The control apparatus is configured to: acquire a current detection value that is a detected value of reactor current flowing through the reactor; acquire the AC voltage; calculate, based on the AC voltage, a command value of the reactor current; set a correction value based on the AC voltage; calculate a post-correction current detection value by subtracting the correction value from the current detection value; and operate the drive switch through peak current mode control, thereby controlling the post-correction current detection value to be in agreement with the command value.

First claim

What is claimed is:

1. A control apparatus for an electric power conversion apparatus, the electric power conversion apparatus comprising a reactor and a drive switch and being configured to convert one of an AC voltage and a DC voltage into the other of the AC voltage and the DC voltage,
the control apparatus comprising:
a detection value acquisition unit configured to acquire a current detection value, the current detection value being a detected value of reactor current flowing through the reactor of the electric power conversion apparatus;
an AC voltage acquisition unit configured to acquire the AC voltage;
a command value calculation unit configured to calculate, based on the AC voltage acquired by the AC voltage acquisition unit, a command value of the reactor current that has a sinusoidal waveform;
a correction value setting unit configured to set a correction value based on the AC voltage acquired by the AC voltage acquisition unit;
a correction unit configured to calculate a post-correction current detection value by subtracting the correction value set by the correction value setting unit from the current detection value acquired by the detection value acquisition unit; and
a current control unit configured to operate the drive switch of the electric power conversion apparatus through peak current mode control, thereby controlling the post-correction current detection value calculated by the correction unit to be in agreement with the command value calculated by the command value calculation unit.

2. The control apparatus as set forth in claim 1 , further comprising a slope-amount setting unit configured to variably set a slope of a slope compensation signal,
wherein
the correction value setting unit is configured to set the correction value based on the slope of the slope compensation signal set by the slope-amount setting unit as well as on the AC voltage acquired by the AC voltage acquisition unit, and
the current control unit is configured to operate the drive switch through the peak current mode control, thereby controlling a slope-compensated post-correction current detection value, which is calculated by adding the slope compensation signal to the post-correction current detection value, to be in agreement with the command value.

3. The control apparatus as set forth in claim 1 , wherein the electric power conversion apparatus is configured to convert the DC voltage into the AC voltage, and
the correction value setting unit is configured to set the correction value to have: a local maximum value at each of a timing in a first period during which the AC voltage is positive and a timing in a second period during which the AC voltage is negative; and a local minimum value at a timing between the timings respectively in the first and second periods at which it has the local maximum value,
the first and second periods together constituting one period of the AC voltage.

4. The control apparatus as set forth in claim 1 , wherein the electric power conversion apparatus is configured to convert the AC voltage into the DC voltage, and
the correction value setting unit is configured to set the correction value to have: a local minimum value at each of a timing in a first period during which the AC voltage is positive and a timing in a second period during which the AC voltage is negative; and a local maximum value at a timing between the timings respectively in the first and second periods at which it has the local minimum value,
the first and second periods together constituting one period of the AC voltage.

Assignees

• Denso Corp

Inventors

• Iyasu Seiji
• Hayashi Yuji
• Handa Yuichi

Classifications

• H02M7/219 Primary

  in a bridge configuration · CPC title

• H02M1/0009

  Devices or circuits for detecting current in a converter · CPC title

• H02M1/0085

  Partially controlled bridges · CPC title

• G01R19/16538

  in AC or DC supplies (G01R19/16519 and G01R19/16528 take precedence) · CPC title

• H02M1/0025

  Arrangements for modifying reference values, feedback values or error values in the control loop of a converter · CPC title