US 2009/0257261 A1Published application

Control method for the matrix converter

AssigneeDaikin Industries, Ltd.

InventorKenichi Sakakibara

Life of this patent

Estimating the term…

Loading patent…

Abstract

An output voltage command signal for outputting a specified three-phase ac output voltage is generated by a line voltage control command signal generating section, and a signal representing a current flow ratio is generated by a current flow ratio generating section based on a specified input current command signal. The output voltage command signal is corrected by a command signal computing section based on the output voltage command signal generated by the line voltage control command signal generating section and the signal representing the current flow ratio generated by the current flow ratio generating section. A PWM conversion signal is generated by a PWM conversion signal generating section based on the corrected output voltage command signal and a carrier signal. Based on the generated PWM conversion signal, a three-phase ac input voltage is converted into a specified three-phase ac input voltage by a conversion section.

A matrix converter for converting a three-phase ac input voltage into a specified three-phase ac output voltage, the matrix converter comprising:

an output voltage command signal generating section configured to generate an output voltage command signal to output the specified three-phase ac output voltage;
a current flow ratio generating section configured to generate a signal representing a current flow ratio based on a specified input current command signal;
a signal correcting section configured to correct the output voltage command signal based on the output voltage command signal generated by the output voltage command signal generating section and the signal representing the current flow ratio generated by the current flow ratio generating section;
a PWM conversion signal generating section configured to generate a PWM conversion signal based on the output voltage command signal corrected by the signal correcting section and a carrier signal;
and
a conversion section configured to convert the three-phase ac input voltage into the specified three-phase ac output voltage based on the PWM conversion signal generated by the PWM conversion signal generating section, wherein
given the input current command signals are represented by ir*, is*, it* and a voltage command is represented by Vs*, assuming the lowest voltage phase as a reference voltage when a polarity of a mid phase out of the output voltage command signal is positive or the highest voltage phase as a reference voltage when the polarity of the mid phase out of the output voltage command signal is negative, the current flow ratio generating section generates the current flow ratio of the maximum phase using
V
s
*

2
3

mid

(

i
r
*

,

i
s
*

,

i
t
*

)
and generates a sum of the current flow ratio of the maximum phase and the current flow ratio of the mid phase using
V
s
*

2
3

max

(

i
r
*

,

i
s
*

,

i
t
*

)
.

62 more elements

Facts

Application

12/298,597Filed 20 Apr 2007

Priority

JP 2006-12569228 Apr 2006

Published

15 Oct 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02M 5/297
Using devices of a triode or transistor type requiring continuous application of a control signal: for conversion of frequency
H02M 5/275
Using discharge tubes with control electrode or semiconductor devices with control electrode: using devices of a triode or transistor type…
H02M 5/293
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only
H02M
Apparatus for conversion between ac and ac, between ac and dc, or

Abstract

Claims8