CN209250258U - A kind of miniature photovoltaic DC-to-AC converter - Google Patents
A kind of miniature photovoltaic DC-to-AC converter Download PDFInfo
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Abstract
The application proposes a kind of miniature photovoltaic DC-to-AC converter, with a plurality of boost modules parallel with one another, its flyback boost conversion circuit for separately including one group of crisscross parallel, the input terminal of the flyback boost conversion circuit is respectively and electrically connected to matched photovoltaic module, output end is electrically coupled to inverter circuit, the output end of the inverter circuit is electrically connected the input terminal of filter circuit, the output end of filter circuit is electrically connected load, a plurality of boost modules parallel with one another are configured in ontology, and the both side ends of ontology are symmetrically arranged in the input terminal of boost module.The inverter also includes the first indicating unit, the second indicating unit；The flicker frequency of first indicating unit and the second indicating unit estimates the current generated output of the miniature photovoltaic DC-to-AC converter.The inverter has high power density, is controlled using independent MPPT, by the optimization generating efficiency to its topology much higher than the group string inverter under Same Efficieney.
Description
Technical field
The utility model relates to a kind of photovoltaic DC-to-AC converters, more particularly to a kind of miniature photovoltaic DC-to-AC converter.
Background technique
For the inverter of solar photovoltaic generation system, such as Miniature inverter (referred to as micro- inverse), with small in size, peace
The features such as dress is convenient, independent MPPT, generating efficiency is high is widely used, but miniature photovoltaic DC-to-AC converter also has lacking for its own
Point, is mainly reflected in that the cost is relatively high, therefore reducing cost will be an important factor for improving miniature photovoltaic DC-to-AC converter cost performance
Place, this can also greatly improve the application of miniature photovoltaic DC-to-AC converter, be pushed further into its development.
A kind of low cost is needed in the market, and the miniature photovoltaic that can be compatible with different (quantity) photovoltaic modulies of high power density is inverse
Become device.
Utility model content
The purpose of this utility model aims to solve at least one of above-mentioned technological deficiency.It proposes a kind of Miniature inverter, has
There is a low cost, high power density and different (quantity) photovoltaic modulies can be compatible with.
To achieve the above objectives, the present invention adopts the following technical solutions:
A kind of Miniature inverter, it includes a plurality of mutual electrically boost modules in parallel, separately include one group and interlock
Flyback boost conversion circuit in parallel, the input terminal of the flyback boost conversion circuit are electrically connected in parallel to matched photovoltaic module,
Output end is electrically in parallel and is connected to the input terminal of inverter circuit, and the output end of the inverter circuit is electrically connected filter circuit
The output end of input terminal, filter circuit is electrically connected load.Such inverter is using independent MPPT and then controls matched
Boost module expands the application range of inverter.
Preferably, the miniature photovoltaic DC-to-AC converter, also includes ontology, and a plurality of boost modules parallel with one another are configured at described
The both side ends of ontology are symmetrically arranged in body interior, the input terminal of the boost module.
Preferably, which also includes that its both ends of capacitor are electrically connected to the defeated of flyback boost conversion circuit
The input terminal of outlet and the inverter circuit.
Preferably, which also includes that its both ends of capacitor are electrically respectively connected to the flyback boosting inverter
The input terminal of circuit.
Preferably, the flyback boost conversion circuit of one group of crisscross parallel separately includes temperature-detecting device, anti-to examine
The temperature of violent change depressor, if the temperature of detection is more than the threshold value of setting, power output drops in the miniature photovoltaic DC-to-AC converter.
Preferably, above-mentioned miniature photovoltaic DC-to-AC converter includes the first inversion component, the second inversion component, first inversion
Component is electrically connected the first control module, and the second inversion component is electrically connected the second control module, the first inversion group
The output end of part is electrically in parallel with the output end of the second inversion component and is connected to the input terminal of inverter circuit, wherein the
One inversion component includes the first boost module electrically in parallel, and the second boost module, the second inversion component includes electrically in parallel
Third boost module, the 4th boost module.
The advantages of scheme in compared with the existing technology, the utility model:
1, it is optimized by the topology to circuit, reduces the ripple of output, the grid-connected current total harmonic distortion of output
No more than 3%；
2, by optimal control module, reduce the inverter volume under Same Efficieney, hoisting power density.
Detailed description of the invention
The utility model is further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the functional block diagram of the miniature photovoltaic DC-to-AC converter of the utility model embodiment；
Fig. 2 is the functional block diagram of a miniature photovoltaic DC-to-AC converter of the utility model embodiment；
Fig. 3 is the functional block diagram of the Miniature inverter of another embodiment of the utility model；
Fig. 4 is the functional block diagram of the Miniature inverter of an embodiment of the present invention；
Fig. 5 is the topological schematic diagram of the Miniature inverter of Fig. 4 embodiment.
Specific embodiment
Above scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are for illustrating
The utility model and be not limited to limitation the scope of the utility model.Implementation condition used in the examples can be according to specific producer
Condition do further adjustment, the implementation condition being not specified is usually the condition in routine experiment.The waterproof etc. of Miniature inverter
Grade is IP67 or more.
Embodiment:
It is as shown in Figure 1 the structural schematic diagram of Miniature inverter to generate electricity by way of merging two or more grid systems.The topological structure of Miniature inverter 10
Comprising the first conversion module 11, high frequency letter will be converted to from the received low dc voltage of photovoltaic module through flyback transformer
Number；Second filter module 12, the high-frequency signal to generate the first translation circuit module are filtered to obtain steamed bun wave；Third
Conversion module 13, received steamed bun wave is converted into satisfactory sine wave alternating current by full-bridge inverting and is delivered to
Power grid；Wherein, the input terminal of first conversion module is electrically connected with electric capacity of voltage regulation (not shown).In the present solution, photovoltaic group
The voltage of part output is generally between 16V -55V.
Its input terminal of Miniature inverter that the utility model embodiment proposes is electrically connected a plurality of photovoltaic modulies, defeated
Outlet is electrically connected to AC network or load.It includes a plurality of boost modules, and a plurality of boost modules are parallel with one another,
It is connected to inverter circuit after outlet side is electrically in parallel, is delivered to exchange after filter circuit filters through the signal of inverter circuit rectification
Power grid.The boost module uses the inverting of crisscross parallel flyback.Preferably, the two of ontology are symmetrically arranged in its input terminal
Side, such design can optimize the wiring of inverter.Miniature inverter using matching input terminal independent MPPT controller according to
The photovoltaic module of different number can be connected according to the occasion of application, it can all be worked normally in the case.Corresponding connection is different
Its output power of the photovoltaic module of quantity is different.The application of the inverter has been widened in such design.
In other embodiments, the output end of miniature photovoltaic DC-to-AC converter is also possible to be electrically connected to user load and electricity
Net.
Next the functional block diagram of Miniature inverter is described in conjunction with Fig. 2 and 3；As shown in Fig. 2, Miniature inverter its
Inside has master board, which includes the first control module, the second control module；First control module is electrically connected
First inversion component, second control module are electrically connected the second inversion component；Through the first inversion component and/or the second inversion group
High-frequency signal after part inversion is input to inverter circuit, is delivered to power grid after inverter circuit rectifies.In one embodiment, it passes through
Alternating current after inverter circuit rectification is delivered to load.First inversion component, the second inversion component separately include 2 groups of boosting moulds
Block.Include the identical flyback boost conversion circuit of one group (a pair) topology in boost module.
It is illustrated in figure 3 the functional block diagram of Miniature inverter, the difference with Fig. 2 embodiment is, first is inverse
Become component and be electrically connected the first indicating unit, the second inversion component is electrically connected the second indicating unit.Such design, according to
One indicating unit, the frequency of the flashing of the second indicating unit estimate substantially current generated output.Preferably, the first instruction is single
Member is LED light with the second indicating unit.Such as, when inverter Operation at full power, which flashes n times (such as 9
It is secondary), it is then every to reduce preset power (such as 50W, 60W specifically regard application settings), reduce the flashing times (N- of LED light
1 time, N-2 specific view application settings).Miniature inverter normal work is the LED light indication signal.
Next combine Fig. 4, Fig. 5 come describe the application proposition Miniature inverter topology,
It is illustrated in figure 4 the functional block diagram of the Miniature inverter of an embodiment of the present invention, Miniature inverter
30 with 4 groups (also referred to as 4 tunnels) boost modules electrically parallel with one another, the first boost module, the second boost module, third boosting mould
Block, the 4th boost module；The input terminal of first boost module is electrically connected the first photovoltaic module PV1, the second boost module it is defeated
Entering end and is electrically connected the second photovoltaic module PV2, the input terminal of third boost module is electrically connected third photovoltaic module PV3, and the 4th
The input terminal of boost module is electrically connected the 4th photovoltaic module PV4, inverter circuit is connected to after output end is electrically in parallel, through inverse
Signal after the reversion of power transformation road is delivered to AC network after filter circuit filters (not shown).The Miniature inverter is using independent
MPPT control, and in practical application, the boost module of Miniature inverter can connect photovoltaic module one can work,
At most 4 photovoltaic modulies of connection, have expanded the application range of inverter.And its cost performance is high under the conditions of Same Efficieney.
It is illustrated in figure 5 the topological schematic diagram of the Miniature inverter of an embodiment of the present invention, Miniature inverter 20
Input terminal is electrically connected 4 photovoltaic modulies PV1, PV2, PV3, PV4, and output end is electrically connected to power grid (AC).Other real
It applies in mode, the output end of Miniature inverter 20 is electrically connected to load.In present embodiment, Miniature inverter 20 can at most connect
Connect 4 photovoltaic modulies.Miniature inverter 20 can connect 1 photovoltaic module, and 2 photovoltaic modulies, 3 photovoltaic modulies all can be just
Often work.Its output power of the photovoltaic module of corresponding connection different number is different.Such design, has widened the inverter
Application.A Miniature inverter, which is generallyd use, in existing photovoltaic generating system design is electrically connected 1 photovoltaic module or 2
A photovoltaic module.System cost is effectively reduced using the inverter of present embodiment.The power density of the inverter is high.This is micro-
Type inverter 20 includes 4 groups of boost modules (22,32,42,52), and 4 groups of boost modules are parallel with one another, and input side is electrical respectively
The photovoltaic module (such as boost module 22 is electrically connected PV1) of matching connection, is connected to inversion electricity after outlet side is electrically in parallel
Road 23, the signal rectified through inverter circuit 23 are delivered to AC network after the filtering of filter circuit 24.In present embodiment, inversion
Circuit 23 uses full-bridge rectification, with diode 231, diode 232, diode 233, diode 234.Diode 231
Cathode is electrically connected to the anode of diode 233, and the anode of diode 231 is electrically connected the anode of diode 232, diode
232 cathode is electrically connected to the anode of diode 234, and the cathode of diode 234 is electrically connected the cathode of diode 233.Two
The tie point of the cathode and 234 anode of diode of the cathode of pole pipe 231 and the tie point of 233 anode of diode and diode 232
It is respectively and electrically connected to the input terminal of filter circuit 24.Filter circuit 24 is by the way of LC filtering.In present embodiment, light
Volt component PV1 flows through inversion flyback boost conversion circuit (photovoltaic module PV2 electric connection Cin2 after being electrically connected capacitor Cin1
After flow through matched inversion flyback boost conversion circuit, photovoltaic module PV3 flows through matched inversion flyback after being electrically connected Cin3
Boost conversion circuit, photovoltaic module PV4 flow through matched inversion flyback boost conversion circuit after being electrically connected Cin4).
In one embodiment, a capacitor (omitting any 3 in Cin1-4) can be used, be electrically connected
(electrically in parallel) is to photovoltaic module PV1-PV4.Such design can reduce the points of component, reduce the risk to break down and mention
The reliability of high inversion.On the other hand, the volume of control panel can be reduced, convenient for the miniaturization of inverter.
Since the topology of 4 groups of boost modules (22,32,42,52) is the same, only element number is different, next only with the
One boost module 22 is described in detail its connection, other such as the second boost modules 32, third boost module 42, the 4th boosting mould
The description for omitting its connection identical as the topology of the first boost module 22 of block 52.
First boost module 22 includes the first flyback boost conversion circuit 22a, the second flyback boost conversion circuit 22b；Its
In, the first flyback boost conversion circuit 22a includes the first flyback transformer 22a2, and one end of primary side side is electrically connected to inductance
One end of 22a1, the other end of inductance 22a1 are electrically connected one end of the first photovoltaic module PV1, and the other end of primary side side is electrically opened
Close the drain electrode end of 22a5, the other end of electrical first photovoltaic module of the source terminal of switch 22a5, the cathode of first diode 22a6
End is electrically connected the drain electrode end of switch 22a5, and the anode tap of first diode 22a6 is electrically connected the source terminal of switch 22a5, the
The anode tap and cathode terminal of one diode 22a6 are respectively and electrically connected to the both ends of capacitor 22a7.One end of its secondary side is electrical
The anode tap of third diode 22a3 is connected, the cathode terminal of third diode 22a3 is electrically connected one end and two of capacitor 22a4
The anode tap of pole pipe 231, the other end of capacitor 22a4 are electrically connected the other end of secondary side.In present embodiment, the first boosting
Module 22 is also comprising its primary side side for being configured at the first flyback transformer 22a2 of temperature-detecting device nearby and near switch 22a5
To detect the temperature of primary side side and switch 22a5, if the temperature of detection is more than the threshold value of setting, power output drops in inverter.
Second flyback boost conversion circuit 22b includes the second flyback transformer 22b2, and one end of primary side side is electrically connected
To one end of inductance 22b1, the other end of inductance 22b1 is electrically connected one end of the first photovoltaic module PV1, the other end of primary side side
The drain electrode end of electrical behavior switch 22b5, the other end of the electrical first photovoltaic module PV1 of the source terminal of switch 22b5, the second diode
The cathode terminal of 22b6 is electrically connected the drain electrode end of switch 22b5, and the anode tap of the second diode 22b6 is electrically connected switch 22b5's
Source terminal, the anode tap and cathode terminal of the second diode 22b6 are respectively and electrically connected to the both ends of capacitor 22b7.Its secondary side
One end is electrically connected the anode tap of the 4th diode 22b3, and the cathode terminal of the 4th diode 22b3 is electrically connected the one of capacitor 22b4
The anode tap of end and diode 231, the other end of capacitor 22b4 are electrically connected the other end of secondary side.In present embodiment, the
One boost module 22 also includes its primary side side for being configured at the second flyback transformer 22b2 of temperature-detecting device nearby and switchs
22b5 is nearby to detect the temperature of primary side side and switch 22b5, if the temperature of detection is more than the threshold value of setting, inverter drops
Power output.
In above scheme, the input terminal of inverter circuit 23 is also parallel with the capacitor to pressure stabilizing.
In above scheme, the temperature range of thermistor can also be chosen to 110 ° to 130 °.If if selection temperature is excessively high,
Component work in temperature it is high when influence power module reliability.If choosing, temperature is too low, premature to reduce the defeated of inverter
Power influences the delivery efficiency of inverter on the whole out.The shape of thermistor, preferably selection rectangular-shape, in this way convenient for solid
It is fixed.Preferably, the patch encapsulation type thermistor chosen.In one embodiment, if the temperature information of thermistor detection is super
It crosses preset threshold and does not increase T DEG C (such as 1 DEG C), then reduce the power of P% (such as 1%) accordingly, specifically regard application setting,
Then make not limit specifically in other embodiments, is only able to achieve its functional interface.
Load can be user load, AC network in above embodiment.Inverter circuit is also referred to as full-bridge circuit for reversing.
Above embodiment, Miniature inverter are also referred to as that high-power Miniature inverter is good, compared to traditional miniature inversion
The power of its power generation of device is big, its fully loaded generated output is between 300W~1200 in one embodiment.Preferably, it is fully loaded (even
When connecing 4 road photovoltaic module) its generated output be 300W, 600W, 900W, 1200W.Its fully loaded power generation in other implementations
Power is between 250W~1000W, e.g., 250W, 500W, 750W, 1000W etc., depending on the output power of its matched photovoltaic module
There is relationship.In other implementations, Miniature inverter includes a plurality of mutual electrically boost modules in parallel, is not limited to
4 tunnels stated can be 5 tunnels, 6 tunnels, 7 tunnels, 8 tunnels, 10 tunnels etc..At this moment view applies the photovoltaic module of matching connection.
The Miniature inverter has the interface of 4 connection photovoltaic modulies, connects 1,2,3 or 4 light depending on application
Lie prostrate component.The interface is configured at the end of inverter ontology two sides.
" connection " may be interpreted as being directly connected in above embodiment, also may be interpreted as brief introduction connection sometimes.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
People be that can understand the content of the utility model and implement accordingly, do not limit the protection scope of the present invention.
It is all according to the spirit of the present invention substantially equivalent transformation that is done or modification, should all cover the protection scope of the utility model it
It is interior.
Claims (10)
1. a kind of miniature photovoltaic DC-to-AC converter, it is characterised in that: include a plurality of mutual electrically boost modules in parallel, the boosting
Module separately includes the flyback boost conversion circuit of one group of crisscross parallel, and the input terminal of the flyback boost conversion circuit is electrical simultaneously
Join and be connected to the electrical parallel connection of matched photovoltaic module, output end and is connected to the input terminal of inverter circuit, the inverter circuit
Output end be electrically connected the input terminal of filter circuit, the output end of filter circuit is electrically connected load.
2. miniature photovoltaic DC-to-AC converter as described in claim 1, which is characterized in that it also include ontology, it is a plurality of parallel with one another
Boost module is configured at the inside of the ontology, and the input terminal of the boost module is connect by being configured at the both side ends of ontology
Mouth is electrically connected to matched photovoltaic module.
3. miniature photovoltaic DC-to-AC converter as described in claim 1, which is characterized in that include also capacitor, both ends are electrically connected to
The input terminal of the output end of flyback boost conversion circuit and the inverter circuit.
4. miniature photovoltaic DC-to-AC converter as described in claim 1, which is characterized in that also include capacitor, both ends are electrically electric respectively
Property is connected to the flyback boost conversion circuit and matched photovoltaic module.
5. miniature photovoltaic DC-to-AC converter as described in claim 1, which is characterized in that the flyback of one group of crisscross parallel, which is boosted, to be become
Circuit is changed respectively also comprising temperature-detecting device, to detect the temperature of flyback transformer, if the temperature of detection is more than setting
When threshold value, power output drops in the miniature photovoltaic DC-to-AC converter.
6. miniature photovoltaic DC-to-AC converter according to any one of claims 1 to 5, which is characterized in that comprising the first inversion component,
Second inversion component, the first inversion component are electrically connected the first control module, and the second inversion component is electrically connected the
Two control modules, the output end of the first inversion component is electrically in parallel with the output end of the second inversion component and is connected to
The input terminal of inverter circuit, wherein the first inversion component includes the first boost module, the second boost module of electrically parallel connection, the
Two inversion components include third boost module electrically in parallel, the 4th boost module.
7. miniature photovoltaic DC-to-AC converter as claimed in claim 6, which is characterized in that the first inversion component is electrically connected first
Indicating unit；The second inversion component is electrically connected the second indicating unit, indicates according to first indicating unit and second
The flicker frequency of unit estimates the current generated output of the miniature photovoltaic DC-to-AC converter.
8. miniature photovoltaic DC-to-AC converter as described in claim 1, which is characterized in that the boost module includes the first boost module
It includes, the first flyback boost conversion circuit, the second flyback boost conversion circuit；The first flyback boost conversion circuit it is defeated
Enter end and electrically in parallel, the output of the first flyback boost conversion circuit of the input terminal of the second flyback boost conversion circuit
It holds electrically in parallel with the output end of the second flyback boost conversion circuit and is connected to inverter circuit.
9. miniature photovoltaic DC-to-AC converter as claimed in claim 8, which is characterized in that the first flyback boost conversion circuit includes
First flyback transformer (22a2), one end of primary side side are electrically connected to one end of inductance (22a1), inductance (22a1) it is another
One end is electrically connected the one end of the first photovoltaic module (PV1), the drain electrode end of the other end electrical behavior switch (22a5) of primary side side, switch
The other end of electrical first photovoltaic module of the source terminal of (22a5), the cathode terminal of first diode (22a6) are electrically connected switch
The drain electrode end of (22a5), the anode tap of first diode (22a6) are electrically connected the source terminal of switch (22a5), first diode
The anode tap and cathode terminal of (22a6) are respectively and electrically connected to the both ends of capacitor (22a7), and one end of secondary side is electrically connected the
The anode tap of three diodes (22a3), the cathode terminal of third diode (22a3) are electrically connected the one end and two poles of capacitor (22a4)
The anode tap of (231) is managed, the other end of capacitor (22a4) is electrically connected the other end of secondary side；
Temperature-detecting device is configured at the primary side side of the first flyback transformer (22a2) nearby and near switch (22a5), uses
It is described miniature if the temperature of detection is more than the threshold value of setting to detect the first flyback transformer and switch the temperature of (22a5)
Power output drops in photovoltaic DC-to-AC converter.
10. miniature photovoltaic DC-to-AC converter as claimed in claim 8, which is characterized in that the second flyback boost conversion circuit,
Comprising the second flyback transformer (22b2), one end of primary side side is electrically connected to one end of inductance (22b1), inductance (22b1)
The other end be electrically connected the first photovoltaic module one end, the drain electrode end of the other end electrical behavior switch (22b5) of primary side side, switch
The other end of electrical first photovoltaic module of the source terminal of (22b5), the cathode terminal of the second diode (22b6) are electrically connected switch
The drain electrode end of (22b5), the anode tap of the second diode (22b6) are electrically connected the source terminal of switch (22b5), the second diode
The anode tap and cathode terminal of (22b6) are respectively and electrically connected to the both ends of capacitor (22b7)；
One end of its secondary side is electrically connected the anode tap of the 4th diode (22b3), the cathode terminal electricity of the 4th diode (22b3)
Property connection capacitor (22b4) one end and diode (231) anode tap, the other end of capacitor (22b4) is electrically connected secondary side
The other end；Temperature-detecting device is configured at the primary side side of the second flyback transformer (22b2) nearby and switch (22b5) is attached
Closely, to detect primary side side and switch the temperature of (22b5), if the temperature of detection is more than the threshold value of setting, the miniature inversion
Power output drops in device.
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| CN201920072757.XU CN209250258U (en) | 2019-01-17 | 2019-01-17 | A kind of miniature photovoltaic DC-to-AC converter |
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| CN201920072757.XU CN209250258U (en) | 2019-01-17 | 2019-01-17 | A kind of miniature photovoltaic DC-to-AC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109524996A (en) * | 2019-01-17 | 2019-03-26 | 浙江恩沃新能源科技有限公司 | A kind of miniature photovoltaic DC-to-AC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524996A (en) * | 2019-01-17 | 2019-03-26 | 浙江恩沃新能源科技有限公司 | A kind of miniature photovoltaic DC-to-AC converter |
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Effective date of registration: 20240228 Address after: Room 401, Building 1, No. 138 Xinjun Ring Road, Minhang District, Shanghai, 201114 Patentee after: ENWO New Energy Technology (Shanghai) Co.,Ltd. Country or region after: China Address before: 321300, 24th Floor, Jintong Building, Yongkang Headquarters Center, Jinhua City, Zhejiang Province Patentee before: ZHEJIANG ENVERTECH Corp.,Ltd. Country or region before: China |