KR101792826B1 - Converter - Google Patents
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- KR101792826B1 KR101792826B1 KR1020150156128A KR20150156128A KR101792826B1 KR 101792826 B1 KR101792826 B1 KR 101792826B1 KR 1020150156128 A KR1020150156128 A KR 1020150156128A KR 20150156128 A KR20150156128 A KR 20150156128A KR 101792826 B1 KR101792826 B1 KR 101792826B1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H02M2001/0074—
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- H02M2007/4822—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a power conversion apparatus that can confirm the number of output terminals of a power conversion apparatus connected to a load and supply current to the load with an efficient operation method. Such a power conversion apparatus includes a rectifying section for rectifying an alternating current applied by an AC power source, a parallel section connected in parallel to the rectifying section, connected in parallel to the smoothing section and the smoothing section for charging the rectified charge and outputting it as a direct current, A first DC link unit connected to an output terminal of the first converter unit to charge the charge output from the first converter unit, and a second DC link unit connected to the output terminal of the second converter unit, A second DC link part connected to an output terminal of the second converter part for charging the electric charge outputted from the second converter part, and a first DC link part including a first output terminal connected to the load, The first and second DC link units and the second DC link unit measure the current flowing to the load in either the first output terminal or the second output terminal to compare the current ripple and the set ripple with each other The recognition controller is connected.
Description
BACKGROUND OF THE
The power conversion apparatus is composed of a rectifier section, a DC section, a plurality of converter modules connected to the DC section, and a DC reactor. Such a power conversion apparatus can convert an AC input from a system into a DC voltage of a desired size in a converter and output it. Because of this feature, the power conversion device is applied to various industrial fields. For example, a power conversion device is installed in a ballast water management system (BWMS) and is used to electrolyze seawater at various concentrations with various DC voltages.
However, the power converter not only generates a large amount of heat in the process of outputting the rectified voltage to a desired voltage, but also generates a lot of EMC radiation noise in the process of converting AC to DC. Moreover, such a problem shortens the service life of the power conversion apparatus and causes a problem of lowering the reliability of the use result.
Therefore, many researches and developments are currently under way to solve such problems. For example, in Korean Patent No. 10-00708307, a temperature monitoring system and method for a power semiconductor device, a method for measuring the temperature of a power semiconductor and outputting the temperature is proposed. However, the developed methods, including these patent applications, offer a solution to solve the problem of heat or noise generated in most power conversion devices, and do not suggest a solution to the problem of heat and noise at the same time.
SUMMARY OF THE INVENTION A problem to be solved by the present invention is to provide a power converter that operates in a time-shifting manner by using a plurality of converters so as to grasp the number of output stages of the converter by using the ripple of the output current, To a power converter.
The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.
According to an aspect of the present invention, there is provided a power conversion apparatus comprising: a rectifying unit for rectifying an alternating current applied by an AC power source; a smoothing unit connected in parallel to the rectifying unit to charge the rectified charge to output a direct current; A first converter unit and a second converter unit connected in parallel to each other for time shift operation so as to form a phase difference of an output voltage to output a combined current, a second converter unit connected to an output terminal of the first converter unit, A second DC link part connected to an output terminal of the second converter part to charge the electric charge outputted from the second converter part, a first DC link part connected to an output terminal of the second converter part, Wherein the second DC link unit includes a second output terminal to which the load is connected, and at least one of the first output terminal and the second output terminal is connected to the first direct current The current control unit may measure the current flowing from the current link unit and the second direct current link unit to the load and compare the ripple of the current with the setting ripple.
Wherein the determination control unit determines that the load is connected to the coupled output terminal to which the first output terminal of the first DC link unit and the second output terminal of the second DC link unit are coupled when the size of the ripple is greater than or equal to the size of the set ripple, And that the load is connected to the first output terminal and the second output terminal when the size of the ripple is less than or equal to the size of the set ripple.
When the magnitude of the combined current output from the first converter unit and the second converter unit is greater than or equal to the rated current of the load, the first converter unit and the second converter unit The first converter unit and the second converter unit operate together when the magnitude of the combined current output from the first converter unit and the second converter unit is equal to or less than the rated current of the load, can do.
Wherein the first converter section and the second converter section form a plurality of semiconductor set sections in which a semiconductor switch and a diode are connected in series, wherein the semiconductor set section of the first converter section and the semiconductor set section of the second converter section alternately operate .
A first DC reactor part may be interposed between the first converter part and the first DC link part and a second DC reactor part may be interposed between the second converter part and the second DC link part.
A first cooling fan that cooperates with the first converter unit to cool the first converter unit and the first DC reactor unit and a second cooling unit that cooperates with the second converter unit to cool the second converter unit and the second DC reactor unit, And a second cooling fan for cooling the part.
The rectifying unit may include a plurality of diode sets connected in series with each other, and the diode sets may be connected in parallel with each other.
In the power conversion apparatus according to the present invention, a plurality of converters for supplying current to the load are operated in a time shift manner, and the number of output stages of the converter can be confirmed by using the ripple of the supplied current. In addition, it is possible to extend the service life of the devices constituting the power conversion apparatus by efficiently operating the converter in response to the number of the identified output terminals and solving the heat generation problem of the converter.
1 is a circuit diagram of a power conversion apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing voltage waveforms outputted by the operation of the first converter section and the second converter section of FIG. 1. FIG.
3 is a diagram showing the current waveform measured by the discrimination measurement unit of FIG.
Fig. 4 is a circuit diagram in which a load is connected to the first output terminal and the second output terminal of the power conversion apparatus of Fig. 1, respectively.
5 is a diagram showing voltage waveforms outputted by the operation of the first converter section and the second converter section in FIG.
6 is a diagram showing the current waveform measured by the discrimination measurement unit of FIG.
7 is a circuit diagram in which a load is connected to a coupling output terminal of the power converter of FIG.
8 is a view showing the operation of the first converter unit and the first cooling fan of FIG.
FIG. 9 is a diagram showing a voltage waveform output by the operation of the first converter unit of FIG. 8; FIG.
10 is a view showing the operation of the second converter unit and the second cooling fan of FIG.
11 is a diagram showing a voltage waveform output by the operation of the second converter unit of FIG.
FIG. 12 is a view showing a state in which the first converter unit and the second converter unit of FIG. 7 are operated at the same time.
FIG. 13 is a diagram showing voltage waveforms in which the first converter unit and the second converter unit of FIG. 12 are operated simultaneously and output.
Brief Description of the Drawings The advantages and features of the present invention and methods of achieving them can be made clear with reference to the embodiments described below in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. To fully disclose the scope of invention to a person skilled in the art, and the invention is only defined by the claims. Like reference numerals refer to like elements throughout the specification.
Hereinafter, a power conversion apparatus according to an embodiment of the present invention will be described in detail with reference to FIG.
1 is a circuit diagram of a power conversion apparatus according to an embodiment of the present invention.
Referring to FIG. 1, a
Hereinafter, the constituent elements of the
The
The rectifying
The smoothing
The
In this way, the
The first
Therefore, the first
The first
The
The
When the load is connected to a single output terminal, that is, to the
Hereinafter, the case where the magnitude of the ripple of the current measured by the
FIG. 2 is a view showing a voltage waveform output by the operation of the first converter section and the second converter section of FIG. 1, FIG. 3 is a diagram showing a current waveform measured by the discrimination measurement section of FIG. 2, 1 is connected to a first output terminal and a second output terminal of the power conversion apparatus.
2 (a) shows the voltage waveform measured by the first
When a low current (for example, 0 to 10 A) of the current output from the first
Hereinafter, the case where the magnitude of the ripple of the current measured by the
FIG. 5 is a diagram showing a voltage waveform output by the operation of the first converter unit and the second converter unit of FIG. 1, FIG. 6 is a diagram showing a current waveform measured by the discrimination unit of FIG. 5, 1 is connected to the output of the power converter.
5, the
Hereinafter, with reference to FIGS. 8 to 13, a state in which the load is operated according to the magnitude of the current supplied to the load when the load is connected to the coupled output terminal will be described in detail.
First, when the rated current of the load is equal to or lower than the combined current output from the
On the other hand, when the rated current of the load is equal to or greater than the combined current output from the
For example, when the maximum combined current in the
When the rated current of the load is equal to or greater than the current that can be output from the
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You can understand that you can. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.
1: Power converter 10: AC power source
20:
20b: second diode set
30: Smooth part
41:
41b: second semiconductor set
42:
41b: fifth semiconductor set
51: first DC reactor part 52: first DC reactor part
61: first DC link part 62: second DC link part
71: first output terminal 72: second output terminal
80:
Claims (7)
A smoothing unit connected in parallel to the rectifying unit to charge the rectified charge and output the rectified current as a direct current;
A first converter unit and a second converter unit connected in parallel to the smoothing unit to output a synthesized current by time shift operation so that a phase difference of an output voltage is formed;
A first DC link part connected to an output terminal of the first converter part and charging the electric charge outputted from the first converter part;
A second DC link part connected to an output terminal of the second converter part and charging the electric charge outputted from the second converter part; And
Wherein the first DC link unit includes a first output terminal to which a load is connected, and the second DC link unit includes a second output terminal to which the load is connected, and at least one of the first output terminal and the second output terminal A determination control unit for measuring the current flowing from the first DC link unit and the second DC link unit to the load and comparing the ripple of the current with the set ripple,
Wherein the determination control unit determines that the load is connected to the coupled output terminal to which the first output terminal of the first DC link unit and the second output terminal of the second DC link unit are coupled when the size of the ripple is greater than or equal to the size of the set ripple, And determines that the load is connected to the first output terminal and the second output terminal when the size of the ripple is less than or equal to the size of the set ripple,
When the magnitude of the combined current output from the first converter unit and the second converter unit is greater than or equal to the rated current of the load, the first converter unit and the second converter unit The first converter unit and the second converter unit operate together when the magnitude of the combined current output from the first converter unit and the second converter unit is equal to or less than the rated current of the load, and,
Wherein a first DC reactor part is interposed between the first converter part and the first DC link part and a second DC reactor part is interposed between the second converter part and the second DC link part,
A first cooling fan that cooperates with the first converter unit to cool the first converter unit and the first DC reactor unit and a second cooling fan that cooperates with the second converter unit to cool the second converter unit and the second DC reactor unit, And a second cooling fan for cooling the reactor section.
Priority Applications (1)
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KR1020150156128A KR101792826B1 (en) | 2015-11-06 | 2015-11-06 | Converter |
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KR1020150156128A KR101792826B1 (en) | 2015-11-06 | 2015-11-06 | Converter |
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KR20170053514A KR20170053514A (en) | 2017-05-16 |
KR101792826B1 true KR101792826B1 (en) | 2017-11-01 |
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KR1020150156128A KR101792826B1 (en) | 2015-11-06 | 2015-11-06 | Converter |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008109840A (en) * | 2006-09-28 | 2008-05-08 | Toyota Motor Corp | Power supply system, vehicle with the same, control method of power supply system, and computer readable recording medium which records program for making computer execute the control method |
JP2010158097A (en) * | 2008-12-26 | 2010-07-15 | Toyota Motor Corp | Power supply device, vehicle equipped with same, and anomaly determination method for power supply devices |
JP2012249431A (en) * | 2011-05-27 | 2012-12-13 | Mie Univ | Power conversion apparatus |
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2015
- 2015-11-06 KR KR1020150156128A patent/KR101792826B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008109840A (en) * | 2006-09-28 | 2008-05-08 | Toyota Motor Corp | Power supply system, vehicle with the same, control method of power supply system, and computer readable recording medium which records program for making computer execute the control method |
JP2010158097A (en) * | 2008-12-26 | 2010-07-15 | Toyota Motor Corp | Power supply device, vehicle equipped with same, and anomaly determination method for power supply devices |
JP2012249431A (en) * | 2011-05-27 | 2012-12-13 | Mie Univ | Power conversion apparatus |
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KR20170053514A (en) | 2017-05-16 |
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