CN208369464U - A kind of circuit inhibiting photovoltaic inverter leakage current - Google Patents
A kind of circuit inhibiting photovoltaic inverter leakage current Download PDFInfo
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- CN208369464U CN208369464U CN201821104762.6U CN201821104762U CN208369464U CN 208369464 U CN208369464 U CN 208369464U CN 201821104762 U CN201821104762 U CN 201821104762U CN 208369464 U CN208369464 U CN 208369464U
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- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 14
- 229910002601 GaN Inorganic materials 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 2
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- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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Abstract
The utility model discloses a kind of circuits for inhibiting photovoltaic inverter leakage current, including the H4 inverter bridge being made of four switching tubes, two inversion inductors, output filter and two freewheeling diodes, wherein: the H4 inverter bridge input terminal is connected to the positive and negative terminal of photovoltaic battery panel PV, an inversion inductor is each provided on the positive and negative terminal of the H4 inverter bridge output end, the output end of the H4 inverter bridge is connected to output filter by inversion inductor, described two freewheeling diode one end are connected with the negative terminal of PV, the other end is respectively connected to the positive and negative route of described two inversion inductor output ends.The utility model passes through the effect of two freewheeling diodes, so that common-mode voltage Ucm significantly reduces, the corresponding leakage current Icm of its institute can reduce, so as to effectively inhibit the leakage current on original H4 bridge photovoltaic DC-to-AC converter to generate, and each inversion inductor flows only through the high-frequency current of half of power frequency period, can accordingly reduce the loss of inversion inductor.
Description
Technical field
The utility model relates to electronic technology field more particularly to a kind of circuit for inhibiting photovoltaic inverter leakage current.
Background technique
Generally for improve photovoltaic DC-to-AC converter generating efficiency, photovoltaic DC-to-AC converter use non-isolated scheme, for it is non-every
Release photovoltaic combining inverter, due to there is no electrical isolation between inverter and power grid, and photovoltaic panel to greatly have in the presence of compared with
Big parasitic capacitance can generate bigger leakage current under the action of inverter HF switch.
Fig. 1 is traditional H4 bridge photovoltaic DC-to-AC converter structural schematic diagram, is made of four switching tubes (S1, S2, S3, S4)
H4 inverter bridge, further includes two inversion inductors (L1, L2) and output filter, and output filter includes EMI filter circuit etc., light
It is Cp that underlying surface plate has parasitic capacitance over the ground, and when using unipolarity switch modulation strategy, photovoltaic panel negative terminal is to power grid N line, i.e.,
On parasitic capacitance Cp, a common-mode voltage Ucm can be generated, common-mode voltage waveform is as shown in Figure 2.
According to the formula of common mode current:Big common-mode voltage shake can bring serious leakage
Current problems.
In order to inhibit leakage current, usual way has:
1, increase the common mode inductance in output electromagnetic interface filter, to increase common code impedance, the method will increase cost, but right
Ground leakage current is a current source, ineffective by the way of increasing impedance.
2, using bipolar modulation mode, the method can solve current leakage, but can seriously affect the effect of inverter
Rate.
3, using H5 bridge or H6 bridge, this two kinds topologys, which exist, needs more switching tubes or two switching tubes, accordingly
More one group of driving circuit or two groups of driving circuits are needed, circuit cost and complexity are increased.
For method 3, although having more one or two switching tube increases circuit cost and complexity, due to H5 bridge and
Switching loss when H6 bridge inverter can reduce circuit work improves inverter relative to traditional H4 bridge inverter
Efficiency, therefore the two circuits are widely applied in existing photovoltaic DC-to-AC converter.And H4 bridge is since there are serious leakages before this
Current problems, and there is no advantage relative to H5 bridge and H6 bridge efficiency, application is fewer.
Therefore, a kind of circuit that can solve leakage current problems of too when photovoltaic DC-to-AC converter uses H4 inverter bridge is needed.
Utility model content
In order to overcome the deficiencies of the prior art, the utility model provides a kind of circuit for inhibiting photovoltaic inverter leakage current,
It can inhibit photovoltaic DC-to-AC converter Ground leakage current in the case where not dramatically increasing cost.
This hair provides a kind of circuit for inhibiting photovoltaic inverter leakage current, and the circuit includes being made of four switching tubes
H4 inverter bridge, two inversion inductors, output filter and two freewheeling diodes, in which: the H4 inverter bridge input terminal connects
Then the positive and negative terminal of photovoltaic battery panel PV is each provided with an inversion inductor, institute on the positive and negative terminal of the H4 inverter bridge output end
It states the output end of H4 inverter bridge and output filter is connected to by inversion inductor, described two freewheeling diode one end and PV's is negative
End is connected, and the other end is respectively connected to the positive and negative route of described two inversion inductor output ends.
4 switching tubes are metal oxide layer semiconductor field effect transistor M OSFET, insulated gate bipolar transistor
One of IGBT, silicon carbide mos SIC MOS, gallium nitride MOS GaN MOS or combination.
The other end of described two freewheeling diodes is respectively connected to described two inversion inductors and the output filter
Between positive and negative route on.
The other end of described two freewheeling diodes is respectively connected to the positive and negative route of the output filter output end.
The output filter includes the EMI filter circuit being combined by common mode inductance, X capacitor, Y capacitance group.
Described two inversion inductors flow only through the high-frequency current of half of power frequency period, as shown in Figure 8.
The positive terminal of described two freewheeling diodes is connected with the negative terminal of PV.
The circuit further includes a soft switching cell, the soft switching cell for realizing H4 inverter bridge Sofe Switch function
Energy.
The utility model embodiment uses unipolarity modulation system, after two freewheeling diodes, so that in photovoltaic face
The common-mode voltage Ucm that plate negative terminal generates power grid N line significantly reduces, and the corresponding leakage current Icm of institute can reduce, so as to have
Effect inhibits the leakage current on original H4 bridge photovoltaic DC-to-AC converter to generate, and does not need to increase the common mode inductance in output electromagnetic interface filter, subtract
Few corresponding cost transformation, also haves no need to change the inverter bridge structure of H4 bridge photovoltaic DC-to-AC converter it is achieved that overall performance is simple
Single, circuit modification is also simple.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is H4 bridge photovoltaic DC-to-AC converter structural schematic diagram in the prior art；
Fig. 2 is common-mode voltage waveform diagram produced by H4 bridge photovoltaic DC-to-AC converter in the prior art；
Fig. 3 is the schematic structural diagram of the first embodiment of the H4 bridge photovoltaic DC-to-AC converter in the utility model；
Fig. 4 is the schematic structural diagram of the second embodiment of the H4 bridge photovoltaic DC-to-AC converter in the utility model；
Fig. 5 is the 3rd embodiment structural schematic diagram of the H4 bridge photovoltaic DC-to-AC converter in the utility model；
Fig. 6 is the fourth embodiment structural schematic diagram of the H4 bridge photovoltaic DC-to-AC converter in the utility model；
Fig. 7 is common-mode voltage waveform diagram produced by the H4 bridge photovoltaic DC-to-AC converter in the utility model embodiment.
Fig. 8 flows through the current waveform of inversion inductor when being the H4 bridge photovoltaic DC-to-AC converter work in the utility model embodiment and shows
It is intended to.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
All other embodiment obtained, fall within the protection scope of the utility model.
Photovoltaic DC-to-AC converter involved in the utility model embodiment includes the H4 inverter bridge being made of four switching tubes, two
A inversion inductor, output filter and two freewheeling diodes, in which: the H4 inverter bridge input terminal is connected to solar battery
The positive and negative terminal of plate (PV) is each provided with an inversion inductor, the H4 inverter bridge on the positive and negative terminal of the H4 inverter bridge output end
Output end output filter is connected to by inversion inductor, described two freewheeling diode one end and solar panel it is negative
End is connected, and the other end is respectively connected to the positive and negative route of described two inversion inductor output ends.
Embodiment one
Fig. 3 shows the photovoltaic DC-to-AC converter schematic structural diagram of the first embodiment in the utility model embodiment, and the photovoltaic is inverse
It includes the H4 inverter bridge being made of four switching tubes (S1, S2, S3, S4), two inversion inductors that change device, which includes: photovoltaic DC-to-AC converter,
(L1, L2), output filter and two freewheeling diodes (D1, D2), in which: H4 inverter bridge input terminal is connected to solar battery
The positive and negative terminal of plate (PV), be each provided on the positive and negative terminal of the H4 inverter bridge output end inversion inductor i.e. inversion inductor (L1) and
Inversion inductor (L2), the output end of the H4 inverter bridge are connected to output filter by inversion inductor, two freewheeling diodes
The positive terminal of (D1, D2) is connected with the negative terminal of solar panel (PV), the negative pole end point of two freewheeling diodes (D1, D2)
It does not access on two positive and negative routes between inversion inductor and output filter, i.e. the negative pole end access of freewheeling diode (D1)
On inversion inductor (L1) to the route on input filter, negative pole end access inversion inductor (L2) of freewheeling diode (D2) is extremely defeated
Enter on the route of filter.
It should be noted that 4 switching tubes (S1, S2, S3, S4) here are metal oxide layer semiconductor field effect transistor
Manage (MOSFET), insulated gate bipolar transistor (IGBT), silicon carbide mos (SIC MOS), in gallium nitride MOS (GaN MOS)
A kind of or combination.For example switching tube S1, S2, S3, S4 use MOSFET perhaps IGBT perhaps SIC MOS or GaN
MOS；Switching tube S1 uses MOSFET, S2 to use IGBT, S3 that SIC MOS, S4 is used to use GaN MOS；S1 and S2 uses IGBT,
S3 uses SIC MOS, and S4 is using GaN MOS etc..
It should be noted that two inversion inductors (L1, L2) here flow only through the high-frequency current of half of power frequency period, such as
Shown in Fig. 8, the loss of inversion inductor is reduced.Output filter includes being combined by common mode inductance, X capacitor, Y capacitance group
EMI filter circuit.
Embodiment two
Fig. 4 shows the photovoltaic DC-to-AC converter schematic structural diagram of the second embodiment in the utility model embodiment, and the photovoltaic is inverse
It includes the H4 inverter bridge being made of four switching tubes (S1, S2, S3, S4), two inversion inductors that change device, which includes: photovoltaic DC-to-AC converter,
(L1, L2), output filter and two freewheeling diodes (D1, D2), in which: H4 inverter bridge input terminal is connected to solar battery
The positive and negative terminal of plate (PV), be each provided on the positive and negative terminal of the H4 inverter bridge output end inversion inductor i.e. inversion inductor (L1) and
Inversion inductor (L2), the output end of the H4 inverter bridge are connected to output filter by inversion inductor, two freewheeling diodes
The positive terminal of (D1, D2) is connected with the negative terminal of solar panel (PV), the negative pole end point of two freewheeling diodes (D1, D2)
It does not access on the positive and negative route of output filter output end, i.e., the negative pole end of freewheeling diode (D1) accesses input filter extremely
On the route of power grid L line, on the negative pole end access input filter to the route of power grid N line of freewheeling diode (D2).
It should be noted that 4 switching tubes (S1, S2, S3, S4) here are metal oxide layer semiconductor field effect transistor
Manage (MOSFET), insulated gate bipolar transistor (IGBT), silicon carbide mos (SIC MOS), in gallium nitride MOS (GaN MOS)
A kind of or combination.For example switching tube S1, S2, S3, S4 use MOSFET perhaps IGBT perhaps SIC MOS or GaN
MOS；Switching tube S1 uses MOSFET, S2 to use IGBT, S3 that SIC MOS, S4 is used to use GaN MOS；S1 and S2 uses IGBT,
S3 uses SIC MOS, and S4 is using GaN MOS etc..
It should be noted that two inversion inductors (L1, L2) here flow only through the high-frequency current of half of power frequency period, such as
Shown in Fig. 8, the loss of inversion inductor is reduced.Output filter includes being combined by common mode inductance, X capacitor, Y capacitance group
EMI filter circuit.Embodiment three
Fig. 5 shows the photovoltaic DC-to-AC converter 3rd embodiment structural schematic diagram in the utility model embodiment, the circuit packet
It includes: the H4 inverter bridge that is made of four switching tubes (S1, S2, S3, S4), two inversion inductors (L1, L2), output filters and two
A freewheeling diode (D1, D2), in which: H4 inverter bridge input terminal is connected to the positive and negative terminal of solar panel (PV), and the H4 is inverse
Become on the positive and negative terminal of bridge output end and is each provided with an inversion inductor i.e. inversion inductor (L1) and inversion inductor (L2), the H4 inversion
The output end of bridge is connected to output filter by inversion inductor, the positive terminals of two freewheeling diodes (D1, D2) and PV's
Negative terminal is connected, the negative pole end of two freewheeling diodes (D1, D2) be respectively connected to two inversion inductors and output filter it
Between positive and negative route on, i.e., negative pole end access inversion inductor (L1) of freewheeling diode (D1) is to the route on input filter
On, in negative pole end access inversion inductor (L2) to the route of input filter of freewheeling diode (D2).The circuit further includes one
Auxiliary realizes that soft switching cell, the soft switching cell are located on the route of the electrode input end of H4 inverter bridge, realizes H4 inverter bridge
Sofe Switch, promoted H4 inverter bridge efficiency.With the rise of soft switch technique, Sofe Switch skill is applied in H4 bridge inverter
Art can increase substantially the working frequency of circuit in the case where not influencing efficiency, using the H4 bridge inversion of soft switch technique
Device, either volume and weight or efficiency have apparent advantage relative to H5 bridge and H6 bridge.
It should be noted that 4 switching tubes (S1, S2, S3, S4) here are metal oxide layer semiconductor field effect transistor
Manage (MOSFET), insulated gate bipolar transistor (IGBT), silicon carbide mos (SIC MOS), in gallium nitride MOS (GaN MOS)
A kind of or combination.For example switching tube S1, S2, S3, S4 use MOSFET perhaps IGBT perhaps SIC MOS or GaN
MOS；Switching tube S1 uses MOSFET, S2 to use IGBT, S3 that SIC MOS, S4 is used to use GaN MOS；S1 and S2 uses IGBT,
S3 uses SIC MOS, and S4 is using GaN MOS etc..
It should be noted that two inversion inductors (L1, L2) here flow only through the high-frequency current of half of power frequency period, such as
Shown in Fig. 8, the loss of inversion inductor is reduced.Output filter includes being combined by common mode inductance, X capacitor, Y capacitance group
EMI filter circuit.
Example IV
Fig. 6 shows the fourth embodiment structural schematic diagram in the utility model embodiment, which includes: to be opened by four
Close H4 inverter bridge, two inversion inductors (L1, L2), output filter and two two poles of afterflow of pipe (S1, S2, S3, S4) composition
It manages (D1, D2), in which: H4 inverter bridge input terminal is connected to the positive and negative terminal of solar panel (PV), the H4 inverter bridge output end
Positive and negative terminal on be each provided with an inversion inductor i.e. inversion inductor (L1) and inversion inductor (L2), the output end of the H4 inverter bridge
It is connected to output filter by inversion inductor, the positive terminal of two freewheeling diodes (D1, D2) is connected with the negative terminal of PV,
The negative pole end of two freewheeling diodes (D1, D2) is respectively connected to the positive and negative route of output filter output end, i.e. afterflow two
On the negative pole end access input filter to the route of power grid L line of pole pipe (D1), the negative pole end access of freewheeling diode (D2) is defeated
Enter on filter to the route of power grid N line.The circuit further includes that an auxiliary realizes that soft switching cell, the soft switching cell are located at H4
On the route of the electrode input end of inverter bridge, the Sofe Switch of H4 inverter bridge is realized, promote the efficiency of H4 inverter bridge.With Sofe Switch
The rise of technology applies soft switch technique in H4 bridge inverter, electricity can be increased substantially in the case where not influencing efficiency
The working frequency on road, using the H4 bridge inverter of soft switch technique, either volume and weight or efficiency, relative to H5 bridge and
H6 bridge has apparent advantage.
It should be noted that 4 switching tubes (S1, S2, S3, S4) here are metal oxide layer semiconductor field effect transistor
Manage (MOSFET), insulated gate bipolar transistor (IGBT), silicon carbide mos (SIC MOS), in gallium nitride MOS (GaN MOS)
A kind of or combination.For example switching tube S1, S2, S3, S4 use MOSFET perhaps IGBT perhaps SIC MOS or GaN
MOS；Switching tube S1 uses MOSFET, S2 to use IGBT, S3 that SIC MOS, S4 is used to use GaN MOS；S1 and S2 uses IGBT,
S3 uses SIC MOS, and S4 is using GaN MOS etc..
It should be noted that two inversion inductors (L1, L2) here flow only through the high-frequency current of half of power frequency period, such as
Shown in Fig. 8, the loss of inversion inductor is reduced.Output filter includes being combined by common mode inductance, X capacitor, Y capacitance group
EMI filter circuit.
Based on Fig. 3 to embodiment one shown in fig. 6 to example IV, the utility model uses unipolarity modulation system, light
Underlying surface plate negative terminal generates common-mode voltage a Ucm, Ucm as shown in figure 3, relative to Fig. 2, it is evident that Ucm to power grid N line
Significantly reduce, corresponding leakage current Icm can reduce.
Compared with circuit structure shown in FIG. 1, this circuit can effectively inhibit leakage current, in actual test, in photovoltaic panel
In the case of having 10nF parasitic capacitance over the ground, the leakage current virtual value of traditional H4 bridge inverter applies this circuit up to 0.8A
Inverter, leakage current only have 0.06A, less than 1/10th.
To sum up, the utility model embodiment uses unipolarity modulation system, after two freewheeling diodes, so that in light
The common-mode voltage Ucm that underlying surface plate negative terminal generates power grid N line significantly reduces, and the corresponding leakage current Icm of institute can reduce, thus
It can effectively inhibit the leakage current on original H4 bridge photovoltaic DC-to-AC converter to generate, not need to increase the common mode electricity in output electromagnetic interface filter
Sense reduces corresponding cost transformation, also haves no need to change the inverter bridge structure of H4 bridge photovoltaic DC-to-AC converter it is achieved that globality
Can be simple, circuit modification is also simple.
Photovoltaic DC-to-AC converter provided by the utility model embodiment is described in detail above, tool used herein
Body example is expounded the principles of the present invention and embodiment, and the above embodiments are only used to help understand
The method and its core concept of the utility model；At the same time, for those skilled in the art, the think of according to the utility model
Think, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as pair
The limitation of the utility model.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
Claims (8)
1. a kind of circuit for inhibiting photovoltaic inverter leakage current, which is characterized in that the circuit includes being made of four switching tubes
H4 inverter bridge, two inversion inductors, output filter and two freewheeling diodes, in which: the H4 inverter bridge input terminal connects
Then the positive and negative terminal of photovoltaic battery panel PV is each provided with an inversion inductor, institute on the positive and negative terminal of the H4 inverter bridge output end
It states the output end of H4 inverter bridge and output filter is connected to by inversion inductor, described two freewheeling diode one end and PV's is negative
End is connected, and the other end is respectively connected to the positive and negative route of described two inversion inductor output ends.
2. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that 4 switching tubes are
Metal oxide layer semiconductor field effect transistor M OSFET, insulated gate bipolar transistor IGBT, silicon carbide mos SIC MOS,
One of gallium nitride MOS GaN MOS or combination.
3. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that described two two poles of afterflow
The other end of pipe is respectively connected to the positive and negative route between described two inversion inductors and the output filter.
4. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that described two two poles of afterflow
The other end of pipe is respectively connected to the positive and negative route of the output filter output end.
5. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that the output filter packet
Include the EMI filter circuit being combined by common mode inductance, X capacitor, Y capacitance group.
6. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that described two inversion inductors
Flow only through the high-frequency current of half of power frequency period.
7. inhibiting the circuit of photovoltaic inverter leakage current as described in claim 1, which is characterized in that described two two poles of afterflow
The positive terminal of pipe is connected with the negative terminal of solar panel.
8. the circuit as described in any one of claim 1 to 7 for inhibiting photovoltaic inverter leakage current, which is characterized in that the electricity
Road further includes a soft switching cell, the soft switching cell for realizing H4 inverter bridge Sofe Switch function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821104762.6U CN208369464U (en) | 2018-07-12 | 2018-07-12 | A kind of circuit inhibiting photovoltaic inverter leakage current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821104762.6U CN208369464U (en) | 2018-07-12 | 2018-07-12 | A kind of circuit inhibiting photovoltaic inverter leakage current |
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| CN208369464U true CN208369464U (en) | 2019-01-11 |
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| CN201821104762.6U Withdrawn - After Issue CN208369464U (en) | 2018-07-12 | 2018-07-12 | A kind of circuit inhibiting photovoltaic inverter leakage current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736699A (en) * | 2018-07-12 | 2018-11-02 | 广东寰宇电子科技股份有限公司 | A kind of circuit inhibiting photovoltaic inverter leakage current |
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2018
- 2018-07-12 CN CN201821104762.6U patent/CN208369464U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108736699A (en) * | 2018-07-12 | 2018-11-02 | 广东寰宇电子科技股份有限公司 | A kind of circuit inhibiting photovoltaic inverter leakage current |
| CN108736699B (en) * | 2018-07-12 | 2024-04-26 | 广东寰宇电子科技股份有限公司 | Circuit for inhibiting leakage current of photovoltaic inverter |
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