CN105391288A - Ripple current suppression circuit of DC bus capacitor - Google Patents
Ripple current suppression circuit of DC bus capacitor Download PDFInfo
- Publication number
- CN105391288A CN105391288A CN201510989128.XA CN201510989128A CN105391288A CN 105391288 A CN105391288 A CN 105391288A CN 201510989128 A CN201510989128 A CN 201510989128A CN 105391288 A CN105391288 A CN 105391288A
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- China
- Prior art keywords
- capacitor
- resistance
- series arm
- power switch
- ripple current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of electric power, in particular to a ripple current suppression circuit of a DC bus capacitor. The ripple current suppression circuit comprises DC capacitors, resistors and power switches, wherein the DC capacitors and the resistors are connected in series to form at least two paths of series branches, the series branches are connected with DC sides of the power switches, and the at least two paths of series branches are connected in parallel. In the ripple current suppression circuit, the series resistors are additionally arranged on the DC capacitor branches, thus, the ripple current of the DC bus capacitor is reduced, the heat generation by the capacitor is reduced, and the service lifetime of the capacitor is prolonged.
Description
Technical field
The present invention relates to technical field of electric power, be specifically related to a kind of dc-link capacitance ripple current and suppress circuit.
Background technology
At voltage-type DC-AC, AC-DC-AC, in the DC link of AC-DC converter, need to use a large amount of electric capacity to be used as energy-storage travelling wave tube and stable DC busbar voltage, because the DC bus of shunt capacitance exists stray inductance, itself and bus capacitor form high-order oscillation circuit, electric capacity ripple current is exaggerated, electric capacity caloric value is caused to rise, electric capacity reduces useful life, as shown in Figure 1, the DC capacitor C00 of converter U DC side is in parallel with DC capacitor C01, due to the existence of DC bus stray inductance Ls, DC capacitor C00, DC capacitor C01, stray inductance Ls forms high-order oscillation circuit.
In prior art, usual employing lamination scheme reduces the stray inductance of DC master row, the concussion amplification coefficient of the oscillation circuit that stray inductance and electric capacity are formed reduces, and then reduce the exaggerated multiple of electric capacity ripple current, although stack bus bar scheme can reduce the multiplication factor of electric capacity ripple preferably, but it makes the design and manufacture cost of DC master row greatly improve, and owing to being difficult to carry out stack-design by the restriction busbar of structure in a lot of commercial Application environment.
Summary of the invention
The object of the invention is to propose a kind of dc-link capacitance ripple current and suppress circuit, reduce dc-link capacitance ripple current, reduce the heating of electric capacity, improve the useful life of electric capacity.
For reaching this object, the present invention by the following technical solutions:
As one aspect of the present invention, a kind of dc-link capacitance ripple current provided suppresses circuit, comprise: DC capacitor, resistance and power switch, described DC capacitor becomes series arm with described resistant series, described series arm is connected with the DC side of described power switch, the quantity of described series arm is at least two-way, and described at least two-way series arm is connected in parallel.
Alternatively, described suppression circuit specifically comprises: resistance R1, resistance R2, DC capacitor C1, DC capacitor C2 and power switch U1, described power switch U1 is DC/AC converter, described resistance R1 and described DC capacitor C1 is connected into the first series arm, described resistance R2 and described DC capacitor C2 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U1.
Alternatively, described suppression circuit specifically comprises: resistance R3, resistance R4, resistance R5, resistance R6, DC capacitor C3, DC capacitor C4 and power switch U2, described power switch U2 is DC/AC converter, described resistance R3 and described DC capacitor C3 and described resistance R4 is connected into the first series arm successively, described resistance R5 and described DC capacitor C4 and described resistance R6 is connected into the second series arm successively, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U2.
Alternatively, described suppression circuit specifically comprises: resistance R7, resistance R8, DC capacitor C5, DC capacitor C6 and power switch U3, described power switch U3 is AC/DC converter, described resistance R7 and described DC capacitor C5 is connected into the first series arm, described resistance R8 and described DC capacitor C6 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U3.
Alternatively, described suppression circuit specifically comprises: resistance R9, resistance R10, resistance R11, resistance R12, DC capacitor C7, DC capacitor C8, DC capacitor C9, DC capacitor C10, power switch U4 and power switch U5, described power switch U4 is AC/DC converter, described power switch U5 is DC/AC converter, described resistance R9 and described DC capacitor C7 is connected into the first series arm, described resistance R10 and described DC capacitor C8 is connected into the second series arm, described resistance R11 and described DC capacitor C9 is connected into the 3rd series arm, described resistance R12 and described DC capacitor C10 is connected into the 4th series arm, described first series arm and described second series arm, described 3rd series arm and described 4th series arm in parallel and be connected with the DC side of described power switch U4 and the DC side of described power switch U5.
Alternatively, described DC capacitor is thin-film electro perhaps electrochemical capacitor.
Beneficial effect of the present invention is: the present invention, by increasing series resistance on DC capacitor branch road, reduces dc-link capacitance ripple current, reduces the heating of electric capacity, improve the useful life of electric capacity.
Accompanying drawing explanation
Fig. 1 is DC-AC translation circuit figure in prior art;
Fig. 2 is the circuit diagram of the dc-link capacitance ripple current suppression circuit that the embodiment of the present invention one provides;
Fig. 3 is the amplification coefficient-frequency characteristic curve diagram of dc-link capacitance ripple current before the increase series resistance that provides of the embodiment of the present invention one;
Fig. 4 is the amplification coefficient-frequency characteristic curve diagram of dc-link capacitance ripple current after the increase series resistance that provides of the embodiment of the present invention one;
Fig. 5 is the circuit diagram of the dc-link capacitance ripple current suppression circuit that the embodiment of the present invention two provides;
Fig. 6 is the circuit diagram of the dc-link capacitance ripple current suppression circuit that the embodiment of the present invention three provides;
Fig. 7 is the circuit diagram of the dc-link capacitance ripple current suppression circuit that the embodiment of the present invention four provides.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with Fig. 2-Fig. 7.
Embodiment one
A kind of dc-link capacitance ripple current suppresses circuit, comprise: DC capacitor, resistance and power switch, described DC capacitor becomes series arm with described resistant series, described series arm is connected with the DC side of described power switch, the quantity of described series arm is at least two-way, and described at least two-way series arm is connected in parallel.
In the present embodiment, by increasing series resistance on DC capacitor branch road, reducing dc-link capacitance ripple current, reducing the heating of electric capacity, improve the useful life of electric capacity, simultaneously series resistance add the effect that can not have influence on capacitance energy storage and stable busbar voltage.
Fig. 2 is the circuit diagram suppressing circuit in the DC-AC translation circuit that provides of the present embodiment, in the present embodiment, described suppression circuit specifically comprises: resistance R1, resistance R2, DC capacitor C1, DC capacitor C2 and power switch U1, described power switch U1 is DC/AC converter, described resistance R1 and described DC capacitor C1 is connected into the first series arm, described resistance R2 and described DC capacitor C2 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with two inputs of the DC side of described power switch U1.
In the present embodiment, described DC capacitor is thin-film electro perhaps electrochemical capacitor.
In other embodiments, the series arm be made up of resistance and DC capacitor, can be three branch roads or more, can realize the present invention equally.
Due to the existence of stray inductance on DC bus, described stray inductance and described first branch road and described second branch road form high-order oscillation circuit.Because described resistance R1, R2 seal in, the damping coefficient of high-order oscillation circuit increases, and serves good attenuating to the ripple current that vibration is amplified.
In other embodiments, the device that resistance can increase the resistance of described branch road by other substitutes, and can realize the invention equally, such as: fuse, shunt.
Fig. 3 is the amplification coefficient-frequency characteristic curve diagram of dc-link capacitance ripple current before increase series resistance, Fig. 4 is the amplification coefficient-frequency characteristic curve diagram of dc-link capacitance ripple current after increase series resistance, as can be seen from Fig. 3 and Fig. 4, increase the amplification coefficient that vibrates in whole frequency range of electric capacity ripple current after series resistance and all significantly reduced.
Embodiment two
As shown in Figure 5, in the present embodiment, described suppression circuit specifically comprises: resistance R3, resistance R4, resistance R5, resistance R6, DC capacitor C3, DC capacitor C4 and power switch U2, described power switch U2 is DC/AC converter, described resistance R3 and described DC capacitor C3 and described resistance R4 is connected into the first series arm successively, described resistance R5 and described DC capacitor C4 and described resistance R6 is connected into the second series arm successively, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U2.
With embodiment one unlike: in described first series arm, the two ends of DC capacitor C3 are connected resistance R3 and R4 respectively, and in described second series arm, the two ends of DC capacitor C4 connect resistance R5 and R6 respectively.
In other embodiments, the quantity of described series arm can be three or more, can realize the present invention equally.
Embodiment three
As shown in Figure 6, in the present embodiment, described suppression circuit specifically comprises: resistance R7, resistance R8, DC capacitor C5, DC capacitor C6 and power switch U3, described power switch U3 is AC/DC converter, described resistance R7 and described DC capacitor C5 is connected into the first series arm, described resistance R8 and described DC capacitor C6 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U3.
As another kind of embodiment, reference example two, in described first series arm, the two ends of DC capacitor C5 also can connect two resistance respectively, and in described second series arm, the two ends of DC capacitor C6 also can connect two resistance respectively, can realize the present invention equally.
In other embodiments, the quantity of described series arm can be three or more, can realize the present invention equally.
Embodiment four
As shown in Figure 7, in the present embodiment, described suppression circuit specifically comprises: resistance R9, resistance R10, resistance R11, resistance R12, DC capacitor C7, DC capacitor C8, DC capacitor C9, DC capacitor C10, power switch U4 and power switch U5, described power switch U4 is AC/DC converter, described power switch U5 is DC/AC converter, described resistance R9 and described DC capacitor C7 is connected into the first series arm, described resistance R10 and described DC capacitor C8 is connected into the second series arm, described resistance R11 and described DC capacitor C9 is connected into the 3rd series arm, described resistance R12 and described DC capacitor C10 is connected into the 4th series arm, described first series arm and described second series arm, described 3rd series arm and described 4th series arm in parallel and be connected with the DC side of described power switch U4 and the DC side of described power switch U5.
In the present embodiment, described U4 and U5 forms AC-DC-AC converter, and described first series arm is connected in parallel with described second series arm, described 3rd series arm and described 4th series arm and is connected with the DC output end of described power switch U3, the direct-flow input end of described power switch U4.
As another kind of embodiment, reference example two, in described first series arm, the two ends of DC capacitor C7 also can connect two resistance respectively, and the two ends of described DC capacitor C8, C9, C10 also can connect two resistance respectively, can realize the present invention equally.
In other embodiments, the quantity of the series arm that each power switch is corresponding can be three or more, can realize the present invention equally.
The foregoing is only the specific embodiment of the present invention, these describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other specific implementation method of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (6)
1. a dc-link capacitance ripple current suppresses circuit, it is characterized in that, comprise: DC capacitor, resistance and power switch, described DC capacitor becomes series arm with described resistant series, described series arm is connected with the DC side of described power switch, the quantity of described series arm is at least two-way, and described at least two-way series arm is connected in parallel.
2. a kind of dc-link capacitance ripple current according to claim 1 suppresses circuit, it is characterized in that, described suppression circuit specifically comprises: resistance R1, resistance R2, DC capacitor C1, DC capacitor C2 and power switch U1, described power switch U1 is DC/AC converter, described resistance R1 and described DC capacitor C1 is connected into the first series arm, described resistance R2 and described DC capacitor C2 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U1.
3. a kind of dc-link capacitance ripple current according to claim 1 suppresses circuit, it is characterized in that, described suppression circuit specifically comprises: resistance R3, resistance R4, resistance R5, resistance R6, DC capacitor C3, DC capacitor C4 and power switch U2, described power switch U2 is DC/AC converter, described resistance R3 and described DC capacitor C3 and described resistance R4 is connected into the first series arm successively, described resistance R5 and described DC capacitor C4 and described resistance R6 is connected into the second series arm successively, described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U2.
4. a kind of dc-link capacitance ripple current according to claim 1 suppresses circuit, it is characterized in that, described suppression circuit specifically comprises: resistance R7, resistance R8, DC capacitor C5, DC capacitor C6 and power switch U3, described power switch U3 is AC/DC converter, described resistance R7 and described DC capacitor C5 is connected into the first series arm, described resistance R8 and described DC capacitor C6 is connected into the second series arm, and described first series arm is in parallel with described second series arm and be connected with the DC side of described power switch U3.
5. a kind of dc-link capacitance ripple current according to claim 1 suppresses circuit, it is characterized in that, described suppression circuit specifically comprises: resistance R9, resistance R10, resistance R11, resistance R12, DC capacitor C7, DC capacitor C8, DC capacitor C9, DC capacitor C10, power switch U4 and power switch U5, described power switch U4 is AC/DC converter, described power switch U5 is DC/AC converter, described resistance R9 and described DC capacitor C7 is connected into the first series arm, described resistance R10 and described DC capacitor C8 is connected into the second series arm, described resistance R11 and described DC capacitor C9 is connected into the 3rd series arm, described resistance R12 and described DC capacitor C10 is connected into the 4th series arm, described first series arm and described second series arm, described 3rd series arm and described 4th series arm in parallel and be connected with the DC side of described power switch U4 and the DC side of described power switch U5.
6. a kind of dc-link capacitance ripple current according to any one of claim 1-5 suppresses circuit, and it is characterized in that, described DC capacitor is thin-film electro perhaps electrochemical capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510989128.XA CN105391288A (en) | 2015-12-24 | 2015-12-24 | Ripple current suppression circuit of DC bus capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510989128.XA CN105391288A (en) | 2015-12-24 | 2015-12-24 | Ripple current suppression circuit of DC bus capacitor |
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| Publication Number | Publication Date |
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| CN105391288A true CN105391288A (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510989128.XA Pending CN105391288A (en) | 2015-12-24 | 2015-12-24 | Ripple current suppression circuit of DC bus capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462379A (en) * | 2018-03-29 | 2018-08-28 | 云南电网有限责任公司电力科学研究院 | A kind of direct current is double to apply high-voltage great-current experiment power supply ripple suppression circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070230087A1 (en) * | 2006-03-31 | 2007-10-04 | Fujitsu Limited | Decoupling capacitor for semiconductor integrated circuit device |
| CN101753008A (en) * | 2008-12-11 | 2010-06-23 | 阿尔特拉公司 | Integrated circuit decoupling capacitors |
| CN102780388A (en) * | 2012-07-24 | 2012-11-14 | 华为技术有限公司 | Direct current bus and capacitor mixed circuit and power inverter |
| CN104811030A (en) * | 2015-04-20 | 2015-07-29 | 南京航空航天大学 | EMI filter network with impedance mismatching network |
| CN205356132U (en) * | 2015-12-24 | 2016-06-29 | 深圳市禾望电气股份有限公司 | Direct current BUS capacitors ripple current suppression circuit |
-
2015
- 2015-12-24 CN CN201510989128.XA patent/CN105391288A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070230087A1 (en) * | 2006-03-31 | 2007-10-04 | Fujitsu Limited | Decoupling capacitor for semiconductor integrated circuit device |
| CN101753008A (en) * | 2008-12-11 | 2010-06-23 | 阿尔特拉公司 | Integrated circuit decoupling capacitors |
| CN102780388A (en) * | 2012-07-24 | 2012-11-14 | 华为技术有限公司 | Direct current bus and capacitor mixed circuit and power inverter |
| CN104811030A (en) * | 2015-04-20 | 2015-07-29 | 南京航空航天大学 | EMI filter network with impedance mismatching network |
| CN205356132U (en) * | 2015-12-24 | 2016-06-29 | 深圳市禾望电气股份有限公司 | Direct current BUS capacitors ripple current suppression circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462379A (en) * | 2018-03-29 | 2018-08-28 | 云南电网有限责任公司电力科学研究院 | A kind of direct current is double to apply high-voltage great-current experiment power supply ripple suppression circuit |
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Application publication date: 20160309 |