CN203261231U - Direct-current filter used for photovoltaic inverter - Google Patents
Direct-current filter used for photovoltaic inverter Download PDFInfo
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- CN203261231U CN203261231U CN 201320293688 CN201320293688U CN203261231U CN 203261231 U CN203261231 U CN 203261231U CN 201320293688 CN201320293688 CN 201320293688 CN 201320293688 U CN201320293688 U CN 201320293688U CN 203261231 U CN203261231 U CN 203261231U
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- capacitor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a direct-current filter used for a photovoltaic inverter. The direct-current filter comprises a first input end, a second input end, a lightning protection module, a filtering circuit and a wiring terminal; the lightning protection module comprises a piezoresistor R1 and a piezoresistor R2 which are in series connection and are arranged between positive and negative ports of the first input end as well as a piezoresistor R3 and a piezoresistor R4 which are in series connection and are arranged between positive and negative ports of the second input end; the filtering circuit comprises a capacitor C1 and a capacitor C3 which are in series connection and are arranged between the positive and negative ports of the first input end as well as a capacitor C4 and a capacitor C6 which are in series connection and are arranged between the positive and negative ports of the second input end; the piezoresistor R1 and the piezoresistor R2 as well as the capacitor C1 and the capacitor C3 are grounded through a capacitor C2; and the piezoresistor R3 and the piezoresistor R4 as well as the capacitor C4 and the capacitor C6 are grounded through a capacitor C5; the filtering circuit may also comprises the capacitor C1, the capacitor C3, the capacitor C4, and a common-mode choke arranged between the capacitor C6 and the wiring terminal.
Description
Technical field
The utility model relates to DC filter, relates in particular to the DC filter for photovoltaic DC-to-AC converter.
Background technology
Usually, the process that AC energy is transformed into direct current energy is called rectification, the circuit of finishing rectification function is called rectification circuit, the device of realizing switching process is called rectifying installation or rectifier.Corresponding with it, the process that direct current energy is transformed into AC energy is called inversion, the circuit of finishing invert function is called inverter circuit, the device of realizing the inversion process is called contravariant equipment or inverter.
Now, the filter kind of using on the photovoltaic DC-to-AC converter is a lot, adds a filter at input side, mainly is to suppress Conducted Electromagnetic Interference, make the electromagnetic interference that self produces not affect other some works, and existing filter filtering effect is not fully up to expectations.
The utility model content
The technical problems to be solved in the utility model is that the DC filter filter effect of existing photovoltaic DC-to-AC converter is good not, provides a kind of filter effect better to be used for the DC filter of photovoltaic DC-to-AC converter for this reason.
The technical solution of the utility model is: the DC filter that is used for photovoltaic DC-to-AC converter, it comprises first input end, the second input, lightning-protection module, filter circuit and binding post, described lightning-protection module comprises piezo-resistance R1 and piezo-resistance R2 and the piezo-resistance R3 that is connected on the series connection between the positive and negative port of the second input and the piezo-resistance R4 that is connected on the series connection between the positive and negative port of first input end, described filter circuit comprises capacitor C 1 and capacitor C 3 and the capacitor C 4 that is connected on the series connection between the positive and negative port of the second input and the capacitor C 6 that is connected on the series connection between the positive and negative port of first input end, pass through capacitor C 2 ground connection between described piezo-resistance R1 and the piezo-resistance R2 and between capacitor C 1 and the capacitor C 3, by capacitor C 5 ground connection, described filter circuit also comprises and is connected on capacitor C 1 between described piezo-resistance R3 and the piezo-resistance R4 and between capacitor C 4 and the capacitor C 6, capacitor C 3, capacitor C 4, common mode inductance between capacitor C 6 and the binding post.
The material of the magnetic core of common mode inductance described in the such scheme is the high magnetic permeability soft ferrite of μ 〉=1000.
The model of the R1 of piezo-resistance described in the such scheme, piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4 is S14K420, and described capacitor C 1, capacitor C 3, capacitor C 4 and capacitor C 6 are 1.2uF, and capacitor C 2 and capacitor C 5 are 100mF.
The beneficial effects of the utility model are so that the filter effect of filter is better by the effect of the filter direct current of the design of resistance in the circuit and electric capacity and common mode inductance.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1, the utility model comprises the DC filter for photovoltaic DC-to-AC converter, it comprises first input end, the second input, lightning-protection module, filter circuit and binding post, described lightning-protection module comprises piezo-resistance R1 and piezo-resistance R2 and the piezo-resistance R3 that is connected on the series connection between the positive and negative port of the second input and the piezo-resistance R4 that is connected on the series connection between the positive and negative port of first input end, described filter circuit comprises capacitor C 1 and capacitor C 3 and the capacitor C 4 that is connected on the series connection between the positive and negative port of the second input and the capacitor C 6 that is connected on the series connection between the positive and negative port of first input end, pass through capacitor C 2 ground connection between described piezo-resistance R1 and the piezo-resistance R2 and between capacitor C 1 and the capacitor C 3, by capacitor C 5 ground connection, described filter circuit also comprises and is connected on capacitor C 1 between described piezo-resistance R3 and the piezo-resistance R4 and between capacitor C 4 and the capacitor C 6, capacitor C 3, capacitor C 4, common mode inductance between capacitor C 6 and the binding post.
Piezo-resistance is a kind of votage limit type protection device.Utilize the nonlinear characteristic of piezo-resistance, when overvoltage appears at two interpolars of piezo-resistance, piezo-resistance can be with voltage clamping to a relatively-stationary magnitude of voltage, thereby realizes the protection to late-class circuit.The major parameter of piezo-resistance has: pressure sensitive voltage, discharge capacity, junction capacitance, response time etc., mainly play the effect of lightning protection in the utility model.
The model of piezo-resistance R1, piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4 is S14K420, and capacitor C 1, capacitor C 3, capacitor C 4 and capacitor C 6 capacitances are 1.2uF, and the capacitance of capacitor C 2 and capacitor C 5 is 100mF.
Common mode inductance has three pairs of contacts, as shown in Figure 1, be respectively 1-2,3-4,5-6, contact 1 is connected on the anodal port of first input end and the second input, contact 3 is connected on the negative pole port of first input end, contact 5 is connected on the negative pole port of the second input, and contact 2,4,6 is connected with binding post, and electric capacity and inductance play the effect of filtering jointly.
Three coils of common mode inductance are on same iron core, and the anodal coil turn that connects is all identical but coiling opposite directions of 2 times of coil turns connecting of negative pole, phase place.When the normal current in the circuit was flowed through common mode inductance, electric current produced reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling, and this moment, the normal signal electric current mainly was subjected to the impact of coil resistance and the damping that causes because of leakage inductance on a small quantity; When the common mode current flowing through coil is arranged, because the same tropism of common mode current understands the induction reactance that produces magnetic field in the same way in coil and increase coil, make coil show as high impedance, produce stronger damping, with this attenuation common-mode electric current, reach the purpose of filtering.The material of iron core is the high magnetic permeability soft ferrite of μ=1000, can certainly get μ greater than 1000 high magnetic permeability soft ferrite.
Claims (3)
1. the DC filter that is used for photovoltaic DC-to-AC converter, it comprises first input end, the second input, lightning-protection module, filter circuit and binding post, it is characterized in that described lightning-protection module comprises piezo-resistance R1 and piezo-resistance R2 and the piezo-resistance R3 that is connected on the series connection between the positive and negative port of the second input and the piezo-resistance R4 that is connected on the series connection between the positive and negative port of first input end, described filter circuit comprises capacitor C 1 and capacitor C 3 and the capacitor C 4 that is connected on the series connection between the positive and negative port of the second input and the capacitor C 6 that is connected on the series connection between the positive and negative port of first input end, pass through capacitor C 2 ground connection between described piezo-resistance R1 and the piezo-resistance R2 and between capacitor C 1 and the capacitor C 3, by capacitor C 5 ground connection, described filter circuit also comprises and is connected on capacitor C 1 between described piezo-resistance R3 and the piezo-resistance R4 and between capacitor C 4 and the capacitor C 6, capacitor C 3, capacitor C 4, common mode inductance between capacitor C 6 and the binding post.
2. the DC filter for photovoltaic DC-to-AC converter as claimed in claim 1, the material that it is characterized in that the magnetic core of described common mode inductance is the high magnetic permeability soft ferrite of μ 〉=1000.
3. the DC filter for photovoltaic DC-to-AC converter as claimed in claim 2, the model that it is characterized in that described piezo-resistance R1, piezo-resistance R2, piezo-resistance R3 and piezo-resistance R4 is S14K420, described capacitor C 1, capacitor C 3, capacitor C 4 and capacitor C 6 are 1.2uF, and capacitor C 2 and capacitor C 5 are 100mF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320293688 CN203261231U (en) | 2013-05-27 | 2013-05-27 | Direct-current filter used for photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320293688 CN203261231U (en) | 2013-05-27 | 2013-05-27 | Direct-current filter used for photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203261231U true CN203261231U (en) | 2013-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320293688 Expired - Fee Related CN203261231U (en) | 2013-05-27 | 2013-05-27 | Direct-current filter used for photovoltaic inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203261231U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149918A (en) * | 2018-09-19 | 2019-01-04 | 广东电网有限责任公司 | A kind of LCL filtering gird-connected inverter protection circuit |
| CN111194522A (en) * | 2017-10-17 | 2020-05-22 | 三菱电机株式会社 | Filter with virtual inductor implemented via ferroelectric negative capacitance |
-
2013
- 2013-05-27 CN CN 201320293688 patent/CN203261231U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111194522A (en) * | 2017-10-17 | 2020-05-22 | 三菱电机株式会社 | Filter with virtual inductor implemented via ferroelectric negative capacitance |
| CN111194522B (en) * | 2017-10-17 | 2023-08-15 | 三菱电机株式会社 | Filter with virtual inductor implemented via ferroelectric negative capacitance |
| CN109149918A (en) * | 2018-09-19 | 2019-01-04 | 广东电网有限责任公司 | A kind of LCL filtering gird-connected inverter protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20160527 |