Space vector modulation for matrix converter and current source converter

Patent metadata

Field	Value
Publication number	US-10103643-B2
Application number	US-201515518590-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Oct 28, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A converter includes a transformer including primary windings and secondary windings, switches connected to the primary windings, an output inductor connected to the secondary windings, and a controller connected to the switches. The controller turns the switches on and off based on dwell times calculated using space vector modulation with a reference current ref whose magnitude changes with time.

First claim

What is claimed is:

1. A converter comprising:
a transformer including primary windings and secondary windings;
switches connected to the primary windings;
an output inductor connected to the secondary windings; and
a controller connected to the switches; wherein
the controller turns the switches on and off based on dwell times calculated using space vector modulation with a reference current ref whose magnitude changes with time.

2. A converter of claim 1 , wherein:
the switches include six switches;
the space vector modulation includes using six active switching states and three zero switching states;
a current space is divided into six sectors by the six active switching states such that a vector with θ=0 is located halfway between two of the active switching states; and
magnitudes of the six active switching states change with time.

3. A converter of claim 2 , wherein:
the controller turns the six switches on and off based on dwell times that are calculated based on an ampere-second balance equation:
ref T s =∫ 0 T α α dt+∫ 0 T β β dt+∫ 0 T 0 0 dt

where {right arrow over (I)} ref =I ref e jθ , θ is an angle between the reference current ref and the vector with θ=0, T s is a sampling period, α , β , 0 , are three nearest adjacent active vectors to ref , and T α , T β , T 0 are dwell times of α , β , 0 .

4. A converter of claim 3 , wherein the controller turns the six switches on and off based on a vector sequence α , 0 , − β , 0 , β , 0 , − α , 0 , during the sampling period T s .

5. A converter of claim 4 , wherein the controller turns the six switches on and off based on a timing sequence T α /2, T 0 /4, T β /2, T 0 /4, T β /2, T 0 /4, T α /2, T 0 /4, during the sampling period T s .

6. A converter of claim 4 , wherein:
the controller calculates the dwell times using:

T
α

=

-
B

+

B
2

+

AC
⁢

⁢

sin
⁡

(

π
⁢

/

⁢
6

-
θ

)

A

T
β

=

-
B

+

B
2

+

AC
⁢

⁢

sin
⁡

(

π
⁢

/

⁢
6

-
θ

)

A

·

sin
⁡

(

π
⁢

/

⁢
6

+
θ

)

sin
⁡

(

π
⁢

/

⁢
6

-
θ

)

T
0

=

T
s

-

T
α

-

T
β

where

A
=

(

4
⁢

u

1
⁢
α

⁢

/

⁢
k

-

u
o

)

+

(

4
⁢

u

1
⁢
β

Assignees

• Murata Manufacturing Co

Inventors

• Zhao Tao
• Xu Dewei
• Afsharian Jahangir
• Gong Bing
• Yang Zhihua

Classifications

• H02M1/12 Primary

  Arrangements for reducing harmonics from AC input or output · CPC title

• H02M7/527

  by pulse width modulation · CPC title

• H02M7/1626 Primary

  with automatic control of the output voltage or current · CPC title

• H02M5/297

  for conversion of frequency · CPC title

• H02M5/293

  using semiconductor devices only · CPC title