Converter system for supplying an electrical load
阅读说明:本技术 用于对电力负载供电的变流器系统 (Converter system for supplying an electrical load ) 是由 S·巴拉 A·卡达菲鲁谷 于 2017-04-21 设计创作,主要内容包括:一种变流器系统包括用于输入AC功率信号的每一相的DC母线;每一相的第一开关单元,包括在DC母线两端串联耦合的第一两个有源开关并在第一两个有源开关之间形成第一开关单元AC电极,该第一开关单元AC电极被耦合到相应的相;以及每一相的第二开关单元,包括在DC母线两端串联耦合的第二两个有源开关并在第二两个有源开关之间形成第二开关单元AC电极,这些第二开关单元AC电极彼此耦合以形成飞中性线。第一开关单元和第二开关单元中的一个开关单元以大于线路频率至少一个数量级的频率进行开关。第一开关单元和第二开关单元中的另一个开关单元以近似等于线路频率的频率进行开关。(A converter system includes a DC bus for each phase of an input AC power signal; a first switching unit for each phase comprising a first two active switches coupled in series across the DC bus and forming a first switching unit AC pole therebetween, the first switching unit AC pole being coupled to the respective phase; and a second switching unit for each phase comprising a second two active switches coupled in series across the DC bus and forming a second switching unit AC pole between the second two active switches, the second switching unit AC poles being coupled to each other to form a flying neutral. One of the first and second switching units is switched at a frequency that is at least one order of magnitude greater than the line frequency. The other of the first and second switching units is switched at a frequency approximately equal to the line frequency.)
1. A converter system for converting a multi-phase AC power signal having one or more phases at a line frequency from an AC power source to a DC power signal to power a load, the converter system comprising:
a DC bus for each phase of the AC power signal;
a first switching unit for each phase of the AC power signal, each first switching unit comprising a first two active switches coupled in series across the DC bus and forming a first switching unit AC pole therebetween, the first switching unit AC pole being coupled to a respective phase of the AC power source; and
second switching cells for each phase of the AC power signal, each second switching cell including a second two active switches coupled in series across the DC bus and forming a second switching cell AC pole between the second two active switches, wherein the second switching cell AC poles are coupled to each other to form a fly-neutral,
wherein one of the first and second switching units is operable to switch at a first frequency at least one order of magnitude greater than the line frequency to convert AC to DC; and
wherein the other of the first and second switching units is operable to switch at a second frequency approximately equal to the line frequency to convert AC to DC.
2. The current transformer system of claim 1, wherein the first frequency is within or beyond the range of 20kHz to 200 kHz.
3. The converter system of claim 1, wherein the first two active switches and/or the second two active switches are gallium nitride (GaN) devices.
4. The converter system of claim 1, further comprising:
a transformer for each phase;
a third switching unit for each phase of the AC power signal, each third switching unit including a third two active switches coupled in series across the DC bus and forming a third switching unit AC electrode therebetween, wherein the third switching unit AC electrode is coupled to the transformer for each phase; and wherein the third switching unit is operable to switch to convert DC to AC at a third frequency that is at least three orders of magnitude greater than the line frequency; and
a rectifier operable to rectify AC to DC for each phase.
5. The converter system of claim 4, wherein the third frequency is in or beyond the range of 100kHz to 1 MHz.
6. The converter system of claim 1, further comprising a filter neutral coupled to each phase of the AC power source via a capacitor.
7. The converter system of claim 6, wherein for each phase, two inductors are coupled in series between the first switching cell AC pole and the AC power source; and the capacitor is coupled between the two inductors.
8. The current transformer system of claim 6, wherein the flying neutral is coupled to the filter neutral.
9. The current transformer system of claim 1, further comprising a chassis ground, wherein the flying neutral is coupled to the chassis ground.
10. The converter system of claim 1, wherein the second switching cell AC poles are directly coupled to each other to form the flying neutral without any intervening inductors or capacitors.
11. The converter system of claim 1, further comprising: a decoupling capacitor directly coupled across the first two active switches and operable to filter out high frequency signals; and a large capacity DC link capacitor coupled across the DC bus and operable to limit voltage ripple across the DC bus.
12. A converter system for converting a multi-phase AC power signal having one or more phases at a line frequency from an AC power source to a desired power signal to power a load, the converter system comprising:
a DC bus for each phase of the AC power signal;
a first at least two switching units, each of the first at least two switching units comprising: a first at least two active switches coupled in series across the DC bus; a first AC electrode formed between the first at least two active switches; a decoupling capacitor coupled directly across the first at least two active switches coupled in series; and an inductor coupled between the first AC electrode for each phase and the AC power source; and
a second at least two switching units, each of the second at least two switching units comprising: a second at least two active switches coupled in series across the DC bus; and a second AC electrode formed between the second at least two active switches, wherein the second AC electrodes for each of the second at least two switching cells are coupled together and form a flying neutral line,
wherein the first at least two switching units are operable to switch at a first frequency at least one order of magnitude greater than the line frequency to convert AC to DC; and
wherein the second at least two switching units are operable to switch at a second frequency approximately equal to the line frequency to convert AC to DC.
13. The converter system of claim 12 further comprising a converter stage coupled to the DC bus for each phase of the AC power signal and operable to convert DC to AC.
14. The converter system of claim 13, said converter stage being a half-bridge converter.
15. The converter system of claim 13, the converter stage being a full bridge converter.
16. The converter system of claim 13, wherein said converter stage comprises AC output terminals; and wherein the converter stage comprises a capacitor in series with an inductor on the AC output terminals.
17. The converter system of claim 13, said converter stage being a parallel resonant converter.
18. The converter system of claim 12, further comprising a single phase transformer and a single phase rectifier for each phase.
19. The converter system of claim 12, wherein the one or more phases are three phases, the converter system further comprising three (3) single-phase transformers in a wye connection or a delta connection, and a three-phase rectifier coupled to the transformers.
20. The converter system of claim 12, wherein the load is an electric motor.
21. A converter system for converting a three-phase AC power signal from an AC power source to a desired power signal to power a load, the converter system comprising:
a DC bus for each phase of the AC power signal;
means for converting AC to DC at a first frequency at least one order of magnitude greater than the line frequency; and
means for converting AC to DC at a second frequency approximately equal to the line frequency.
Technical Field
The present application relates generally to power systems and more particularly, but not exclusively, to a converter system for powering an electrical load.
Background
Various types of converter systems, such as unity power factor converter systems, are still an area of interest. Some existing systems have various shortcomings, drawbacks, and disadvantages relative to certain applications. For example, in some converter systems, the switching speed may not be fast enough to achieve the desired size and weight goals. Therefore, there remains a need for further contributions in this area of technology.
Disclosure of Invention
One embodiment of the present invention is a unique converter system. Another embodiment is a unique converter system. Another embodiment is a unique converter system. Other embodiments include apparatus, systems, devices, hardware, methods, and converter combinations for a converter system. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and drawings provided herein.
Drawings
The description herein makes reference to the following drawings wherein like reference numerals refer to like parts throughout the several views, and wherein:
fig. 1 schematically shows a planning diagram of some aspects of a non-limiting example of a converter system according to an embodiment of the invention.
Fig. 2 schematically shows some aspects of a non-limiting example of an alternating current high frequency switching cell according to an embodiment of the invention.
Fig. 3 schematically illustrates some aspects of a non-limiting example of a converter system according to an embodiment of the invention.
Fig. 4 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 5 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 6 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 7 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 8 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 9 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 10 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 11 schematically illustrates some aspects of a non-limiting example of a DC/AC conversion stage of a converter system according to an embodiment of the invention.
Fig. 12 schematically illustrates some aspects of a non-limiting example of a load stage of a converter system according to an embodiment of the invention.
Fig. 13 schematically illustrates some aspects of a non-limiting example of a load stage of a converter system according to an embodiment of the invention.
Fig. 14 schematically illustrates some aspects of a non-limiting example of a load stage of a converter system according to an embodiment of the invention.
Fig. 15 schematically illustrates some aspects of a non-limiting example of a load stage of a converter system according to an embodiment of the invention.
Detailed Description
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications in the described embodiments, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates.
Referring to fig. 1, some aspects of a non-limiting example of a converter system 10 according to an embodiment of the invention are schematically illustrated. The converter system 10 is an isolated three-phase converter system. In one form, the converter system 10 is an electric vehicle charger or other power source. In other embodiments, the converter system 10 may be in other forms. For example, the converter system 10 may be configured to power an electric motor, such as a three-phase electric motor. In some embodiments, the converter system 10 provides power factor correction, such as unity power factor at the output. In one form, the input voltage is nominally 380/480 line-line/rms VAC. In other embodiments, other input values may be employed. In one form, a nominal 50-1000VDC is output. In other embodiments, the output voltage may vary according to the needs of the application. In one form, the output power is in the range of 10kW to 50 kW. In other embodiments, the output power may vary according to the needs of the application.
The converter system 10 is coupled to a three-phase AC (alternating current) power source 12 having phases U1, U2, U3 at a line frequency of, for example, 50Hz or 60 Hz. The converter system 10 includes a DC (direct current) bus D1, D2, D3 for each respective phase U1, U2, U3. Each DC bus has a positive rail D1+, D2+, D3+, and a negative rail D1-, D2-, D3-. The converter system 10 includes a high
The
A
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Referring to fig. 2, in another embodiment, the high frequency switching unit may take the form of an interleaved
Referring again to fig. 1, the
In one form, the low frequency
Referring to fig. 3, some aspects of a non-limiting example of a
Referring again to FIG. 1, the
The AC output of the
Referring to fig. 4, some aspects of a non-limiting example of a
Referring to fig. 5, some aspects of a non-limiting example of a
Referring to fig. 6, some aspects of a non-limiting example of a
Referring to fig. 7, some aspects of a non-limiting example of a
Referring to fig. 8, some aspects of a non-limiting example of a
Referring to fig. 9, some aspects of a non-limiting example of a
Referring to fig. 10, some aspects of a non-limiting example of a
Referring to fig. 11, some aspects of a non-limiting example of a transform stage 18H according to an embodiment of the present invention are schematically shown. In the embodiment of fig. 11, the conversion stage 18H is in the form of a full bridge + parallel resonance LC. For example, the converter stage 18H may be used for a parallel resonant converter. The conversion stage 18H includes two (2) parallel pairs of
Referring again to fig. 1, the
Referring to fig. 12, some aspects of a non-limiting example of a
Referring to fig. 13, some aspects of a non-limiting example of a
Referring to fig. 14, some aspects of a non-limiting example of a
In each of fig. 12, 13 and 14, the diodes in the rectifier may be replaced by active switches (e.g., MOSFETs or IGBTs). In some embodiments, an inductor may be located between each bridge 94 (or 82) and the
Referring to fig. 15, some aspects of a non-limiting example of a load stage 20D according to an embodiment of the invention are schematically illustrated. In the embodiment of fig. 15, the load is a motor, such as a three-
An embodiment of the invention includes a converter system for converting a multi-phase AC power signal having one or more phases at a line frequency from an AC power source to a DC power signal to power a load, the converter system comprising: a DC bus for each phase of the AC power signal; a first switching unit for each phase of the AC power signal, each first switching unit comprising a first two active switches coupled in series across the DC bus and forming a first switching unit AC pole therebetween, the first switching unit AC pole being coupled to a respective phase of the AC power source; and a second switching unit for each phase of the AC power signal, each second switching unit comprising a second two active switches coupled in series across the DC bus and forming a second switching unit AC pole between the second two active switches, wherein the second switching unit AC poles are coupled to each other to form a flying neutral, wherein one of the first and second switching units is operable to switch at a first frequency that is at least one order of magnitude greater than the line frequency to convert AC to DC; and wherein the other of the first and second switching units is for switching at a second frequency approximately equal to the line frequency to convert AC to DC.
In a refinement, the first frequency is in or beyond the range of 20kHz to 200 kHz.
In another refinement, the first two active switches and/or the second two active switches are gallium nitride (GaN) devices.
In a further refinement, the converter system further comprises a transformer for each phase; a third switching unit for each phase of the AC power signal, each third switching unit including a third two active switches coupled in series across the DC bus and forming a third switching unit AC pole therebetween, wherein the third switching unit AC pole is coupled to the transformer for each phase; and wherein the third switching unit is operable to switch to convert DC to AC at a third frequency that is at least three orders of magnitude greater than the line frequency; and the rectifier is operable to rectify the AC to DC for each phase.
In yet another refinement, the third frequency is in or beyond the range of 100kHz to 1 MHz.
In a further refinement, the converter system further comprises a filter neutral coupled to each phase of the AC power source via a capacitor.
In a further refinement, for each phase, two inductors are coupled in series between the first switching cell AC pole and the AC power source; and a capacitor is coupled between the two inductors.
In yet another refinement, the flying neutral is coupled to a neutral filter.
In a further refinement, the converter system further comprises a chassis ground, wherein the flying neutral is coupled to the chassis ground.
In yet another refinement, the second switching unit AC electrodes are directly coupled to each other to form a flying neutral without any intervening inductor or capacitor.
In yet another refinement, the current transformer system further comprises a decoupling capacitor directly coupled across the first two active switches and operable to filter out high frequency signals; and a bulk DC link capacitor coupled across the DC bus and operable to limit voltage ripple across the DC bus.
An embodiment of the invention includes a converter system for converting a multi-phase AC power signal having one or more phases at a line frequency from an AC power source to a desired power signal for powering a load, the converter system comprising: a DC bus for each phase of the AC power signal; a first at least two switching cells, each of the first at least two switching cells comprising a first at least two active switches coupled in series across a DC bus; a first AC electrode formed between the first at least two active switches; a decoupling capacitor directly coupled across a first at least two active switches coupled in series; and an inductor coupled between the first AC electrode of each phase and the AC power source; and a second at least two switching cells, each of the second at least two switching cells comprising a second at least two active switches coupled in series across the DC bus; and a second AC pole formed between the second at least two active switches, wherein the second AC poles of each of the second at least two switching cells are coupled together and form a flying neutral, wherein the first at least two switching cells are operable to switch at a first frequency that is at least one order of magnitude greater than the line frequency to convert AC to DC; and wherein the second at least two switching units are operable to switch at a second frequency approximately equal to the line frequency to convert AC to DC.
In one refinement, the converter system further comprises a conversion stage coupled to the DC bus for each phase of the AC power signal and operable to convert DC to AC.
In a further refinement, the converter stage is a half-bridge converter.
In a further refinement, the converter stage is a full-bridge converter.
In yet another refinement, the conversion stage comprises an AC output terminal; and wherein the converter stage comprises a capacitor in series with an inductor at the AC output terminal.
In a further refinement, the converter stage is a parallel resonant converter.
In a further refinement, the converter system further comprises a single-phase transformer and a single-phase rectifier for each phase.
In yet another refinement, the one or more phases are three phases, which further includes three (3) single-phase transformers in a wye connection or delta connection, and a three-phase rectifier coupled to the transformers.
In a further refinement, the load is an electric motor.
An embodiment of the present invention includes a converter system for converting a three-phase AC power signal from an AC power source to a desired power signal to power a load, the converter system comprising: a DC bus for each phase of the AC power signal; means for converting AC to DC at a first frequency at least one order of magnitude greater than the line frequency; and means for converting the AC to DC at a second frequency approximately equal to the line frequency.
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. It should be understood that the use of words such as preferred, preferably or more preferred in the description above indicate that the feature so described may be preferred, but not essential, and that embodiments lacking the same may be contemplated as within the scope of the application, the scope being defined by the claims that follow. In reading the claims, it is noted that when words such as "a," "an," "at least one," or "at least a portion" are used, it is not intended that the claims be limited to only one item unless specifically stated to the contrary in the claims. When the term "at least a portion" and/or "a portion" is used the item can include a portion and/or the entire item unless clearly indicated to the contrary.
Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.
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