CN202616799U - Photovoltaic power supply system reverse power prevention apparatus based on solid-state relay - Google Patents
Photovoltaic power supply system reverse power prevention apparatus based on solid-state relay Download PDFInfo
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- CN202616799U CN202616799U CN2011203791552U CN201120379155U CN202616799U CN 202616799 U CN202616799 U CN 202616799U CN 2011203791552 U CN2011203791552 U CN 2011203791552U CN 201120379155 U CN201120379155 U CN 201120379155U CN 202616799 U CN202616799 U CN 202616799U
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Abstract
The utility model discloses a photovoltaic power supply system reverse power prevention apparatus based on a solid-state relay. The apparatus comprises a load power acquisition module, a switch module based on the solid-state relay, a photovoltaic power supply battery and a grid-connected control module. The load power acquisition module is used to monitor real-time power value of a circuit load. The grid-connected control module is electrically connected with the power acquisition module and uses the real-time power value obtained by the load power acquisition module to determine the number of the photovoltaic power supply battery which needs to be connected in parallel with an alternating current network so that a power supply volume of the photovoltaic power supply battery which is connected in parallel is guaranteed to be less than the real-time power value. The switch module based on the solid-state relay is electrically connected with the grid-connected control module and is controlled by the grid-connected control module so as to realize rapid conduction and cutting off of the photovoltaic power supply battery. By using the apparatus of the utility model, a current reverse power problem in the current photovoltaic power supply field and a current breakpoint problem generated during a circuit switching process are solved; and security of photovoltaic grid-connected power supply and stability of photovoltaic power supply are effectively guaranteed.
Description
Technical field
This practical photovoltaic power generation grid-connecting power supply technique field especially relates to the anti-contrary merit device of a kind of photovoltaic power supply system based on solid-state relay.
Background technology
Photovoltaic power supply is current hot spot technology; Different with the supply power mode of existing alternative electric generation supply network, present stage, generally as the replenishing of Alternating Current Power Supply, the power supply technique but photovoltaic power supply equipment is incorporated into the power networks was because amount of power supply is generally the constant power value; In case total power of certain all load consumption of period is compared less than the performance number of photovoltaic power supply supply of equipment; To cause pouring in down a chimney of electric current to the AC network that is incorporated into the power networks so, and form the contrary merit of electric current, thereby possibly damage the power supply unit in the AC network.
At present existing anti-contrary merit device is to net the voltage and the electric current of side through monitoring at any time, in case find to the electrical network intake, can reduce output current through the Communication Control inverter immediately, reduces the photovoltaic system generated output; When communication failure or other system fault occurring, anti-adverse current controller can be controlled the output contactor and break off, thereby thoroughly stops to mains supply.The scheme of comparative maturity basically all is the inverse probability problem to the large-sized photovoltaic power supply engineering at present; Generated output is between 10kW-1MW; Along with photovoltaic power supply is accepted by popular gradually; City light coucher journey is the low profile photovoltaic power supply engineering mostly, and does not also have the anti-contrary merit scheme of low profile photovoltaic power supply engineering at present, especially to the anti-contrary merit device of the individual event electricity consumption of low profile photovoltaic power supply engineering.
The utility model content
The utility model embodiment provides a kind of parallel net type photovoltaic power supply system anti-contrary merit device, in order to solve the contrary merit problem that exists in photovoltaic power supply and AC network and the network process.
The utility model embodiment provides a kind of parallel net type photovoltaic power supply system anti-contrary merit device; Comprise the bearing power acquisition module, switch module, photovoltaic power supply battery pack; The control module that is incorporated into the power networks, said bearing power acquisition module is used for observation circuit load realtime power value; The said control module that is incorporated into the power networks is electrically connected with said bearing power acquisition module; Utilize the wattage of the photovoltaic power supply battery pack that said realtime power value that said bearing power acquisition module obtains confirms to be connected in parallel with AC network, and total wattage of the photovoltaic power supply battery that is connected in parallel is less than said realtime power value; Said switch module is electrically connected with the said control module that is incorporated into the power networks, and controlled by the said control module that is incorporated into the power networks, and realizes the conducting of photovoltaic power supply battery pack and ends.
The design of the utility model is: connect real-time monitoring modular at load end, add control module at the photovoltaic power supply end and control the photovoltaic power supply electric weight, built bridge by the control module that is incorporated into the power networks between the two.The bearing power acquisition module is gathered load information and is sent into the control module that is incorporated into the power networks, and the control module that is incorporated into the power networks is sent into switch module through the analyzing and processing of information is obtained a result, and switch module is according to receiving to such an extent that consequential signal is realized the break-make control to the photovoltaic power supply battery pack.Thereby through real-time monitoring, reach purpose, thereby the control photovoltaic power supply is forever less than loading demand to the control of battery pack break-make to load.
In brief, the key element of the utility model is: 1, be directed against the real-time monitoring of load; 2, to the analyzing and processing of load information; 3, to the control of photovoltaic power supply battery pack break-make.
The utility model provides a kind of photovoltaic power supply system based on solid-state relay anti-contrary merit device; Comprise bearing power acquisition module (101), based on the switch module (102) of solid-state relay, the control module that is incorporated into the power networks (103); Photovoltaic power supply battery pack (104); It is characterized in that: be divided into many group photovoltaic power supply battery subelements to photovoltaic power supply battery pack (104), through the input power of every group of photovoltaic power supply battery subelement and the contrast of load value, the battery pack number of decision photovoltaic power supply end conducting; Said bearing power acquisition module (101) is used for the realtime power value of circuit load (106) is monitored; The said control module that is incorporated into the power networks (103) is electrically connected with said bearing power acquisition module (101); The group number of the photovoltaic power supply battery pack that the said realtime power value of utilizing said bearing power acquisition module (101) monitoring to obtain is confirmed to be connected in parallel with AC network, the amount of power supply of the photovoltaic power supply battery pack (104) that guarantees to be connected in parallel is always less than said realtime power value; Said switch module based on solid-state relay (102) is electrically connected with the said control module that is incorporated into the power networks (103), receives the said control module that is incorporated into the power networks (103) control, realizes the conducting of photovoltaic power supply battery pack (104) and ends.
Preferred embodiment according to the utility model; Wherein connect between on the same group the photovoltaic power supply battery subelement; Parallelly connected between group and the group, each is organized photovoltaic power supply battery subelement and is series battery, and its power is determined by photovoltaic power supply battery number of connecting separately and photovoltaic power supply electric power generation cell.
According to the preferred embodiment of the utility model, also comprise digital display tube or light-emitting diode, the photovoltaic cell group number of conducting is shown in real time.
According to the preferred embodiment of the utility model, also comprise photovoltaic power supply power display module, be used for photovoltaic power supply power is shown in real time.
According to the preferred embodiment of the utility model, the display device of said photovoltaic power supply power display module comprises indicator light, in charactron or the liquid crystal display screen any one.
The utility model also provides a kind of parallel net type photovoltaic power supply system anti-contrary merit device; The anti-contrary merit device of a kind of parallel net type photovoltaic power supply system; Comprise bearing power acquisition module (101), switch module (102), the control module that is incorporated into the power networks (103); Photovoltaic power supply battery pack (104); It is characterized in that: said photovoltaic power supply battery pack (104) is divided into many group photovoltaic power supply battery subelements, through to the conducting of each photovoltaic power supply battery subelement or by controlling, makes up different photovoltaic power supply battery subelement combination arrays; And then, make said photovoltaic power supply battery pack (104) that a series of various power performance numbers can be provided through the different photovoltaic power supply battery subelement combination array of conducting; Said bearing power acquisition module (101) is used for the realtime power value of real-time observation circuit load (106), and the realtime power value that monitors is directly fed back to the control module that is incorporated into the power networks (103); The said control module that is incorporated into the power networks (103) is electrically connected with said bearing power acquisition module (101); Receive the realtime power value of bearing power acquisition module (101) feedback; Utilize the performance number of the photovoltaic power supply battery pack (104) that the resulting said realtime power value of said bearing power acquisition module (101) monitoring confirms to be connected in parallel with AC network, and then need to confirm the photovoltaic power supply battery subelement combination array of conducting; Said switch module (102) is electrically connected with photovoltaic power supply battery pack (104), circuit load (106) and the control module that is incorporated into the power networks (103); Receive the control of the said control module that is incorporated into the power networks (103); The be incorporated into the power networks performance number of power supply of conducting through controlling different different photovoltaic power supply battery subelement combination arrays and ending, control photovoltaic power supply battery pack (104).
Preferred embodiment according to the utility model; The performance number of the photovoltaic power supply battery pack (104) that the wherein said control module that is incorporated into the power networks (103) is confirmed to be connected in parallel with AC network comprising: under the prerequisite of power supply gross power less than the said realtime power value that monitors that guarantees photovoltaic power supply battery pack (104); Calculate and the immediate output power value of the said realtime power value that monitors, as the performance number of the photovoltaic power supply battery pack (104) that need be connected in parallel with AC network.
Preferred embodiment according to the utility model; Application switch module (102) is controlled every group of photovoltaic power supply battery subelement; Said switch module comprises the variable connector subelement that links to each other with each group photovoltaic power supply battery subelement; Each switch subelement of said switch module is by the said control module that is incorporated into the power networks (103) control, confirms the conducting of each way switch subelement and ends.
According to the preferred embodiment of the utility model, each is organized photovoltaic power supply battery subelement and is series battery, and its power is by the photovoltaic power supply battery number of series connection separately and the output power decision of photovoltaic power supply battery, and each organizes parallel connection between the photovoltaic power supply battery subelement.
According to the preferred embodiment of the utility model, the said control module that is incorporated into the power networks (103) is to use the single-chip microcomputer of input control program, photovoltaic power supply battery pack (104) is controlled, thereby the photovoltaic power supply battery subelement combination array of conducting is wanted in decision.
According to the preferred embodiment of the utility model, also comprise digital display tube or light-emitting diode, the photovoltaic power supply battery subelement combination array pie graph of conducting is shown in real time.
According to the preferred embodiment of the utility model, also comprise photovoltaic power supply power display module, be used for photovoltaic power supply power is shown in real time.
According to the preferred embodiment of the utility model, the display device of said photovoltaic power supply power display module comprises indicator light, in charactron or the liquid crystal display screen any one.
Preferred embodiment according to the utility model; Said switch module is the solid-state relay control circuit; Through solid-state relay to the conducting of each photovoltaic power supply battery subelement or by controlling, thereby make up different photovoltaic power supply battery subelement combination arrays.
In sum, the control module that is incorporated into the power networks has guaranteed the load power consumption forever greater than the photovoltaic power supply amount, makes civil power have small electric weight to flow into user side forever; The bearing power acquisition module guarantees the exact acquisition to the load end variation, and when changing appearred in load value, device can be made corresponding in the shortest time; The break-make way of switch module control battery pack guarantees that user side can utilize photovoltaic power supply to greatest extent.
The anti-contrary merit device of the parallel net type photovoltaic power supply system that the utility model provides; Utilize the wattage of the photovoltaic power supply battery pack that load end realtime power value that the bearing power acquisition module obtains confirms to be connected in parallel with AC network through the control module that is incorporated into the power networks; Under the condition of total wattage less than said realtime power value of the photovoltaic power supply battery that guarantees to be connected in parallel; Can guarantee effectively that AC network is in the state to electric all the time; Solve the contrary merit problem of the electric current that exists in the prior art, effectively guaranteed the fail safe that photovoltaic power supply equipment is incorporated into the power networks and supplies power.
In the utility model, owing to,, guarantee that the photovoltaic power output always less than load consumption, is in to the electric state utility grid all the time through the real-time monitoring of load being determined the group number of photovoltaic power supply battery conducting the parallel connection of photovoltaic power supply battery group.Above-mentioned functions is passed through the bearing power acquisition module, switch module, and the control module that is incorporated into the power networks realizes.Thereby solved the be incorporated into the power networks inverse probability of engineering of low profile photovoltaic power supply and impacted the utility grid problem; The low voltage electric network that electric pressure is 0.4kV is all inserted in most of low profile photovoltaics power station, is user side self-contained type power-supply system basically, generates power for their own use, not to medium voltage network or high-voltage fence feed., prevent that photovoltaic power supply from getting into utility grid, thereby effectively prevent photovoltaic system only to inner mains supply in order to ensure the photovoltaic power supply system, guarantee the electrical network quality to the electrical network feed.
The utility model effectively solves electric current inverse probability problem that exists in the existing photovoltaic power supply field and the current breakpoint problem that in the circuit handoff procedure, produces, and has effectively guaranteed the fail safe of grid-connected power supply and the stability of photovoltaic power supply.
Though will combine certain exemplary enforcement and method for using to describe the utility model hereinafter, and it will be appreciated by those skilled in the art that and be not intended to the utility model is limited to these embodiment.Otherwise, be intended to cover the spirit and interior all substitutes, correction and the equivalent of scope that are included in the defined the utility model of appending claims.
Other advantages, target and the characteristic of the utility model will be set forth in specification subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from the practice of the utility model, obtain instruction to investigating of hereinafter.The target of the utility model and other advantages can be passed through following specification, claims, and the structure that is particularly pointed out in the accompanying drawing realizes and obtains.
Description of drawings
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done further to describe in detail below, wherein:
Fig. 1 is the structure principle chart of the anti-contrary merit device of parallel net type photovoltaic power supply system of the utility model;
Fig. 2 is the architecture principle figure of the control module that is incorporated into the power networks, battery subelement and the switch subelement of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, and, the utility model is done further elaboration with reference to accompanying drawing below in conjunction with instantiation.
The utility model embodiment provides a kind of parallel net type photovoltaic power supply system anti-contrary merit device; According to bearing power conditions of demand in real time the battery of photovoltaic power supply equipment is carried out conducting or opening operation at the anti-contrary merit device of this parallel net type photovoltaic power supply system; Under the condition of total wattage less than load realtime power value of the photovoltaic power supply battery power output that guarantees to be connected in parallel; Can effectively make AC network be in all the time, ensure the fail safe that photovoltaic power supply equipment and AC network are incorporated into the power networks the electric state.
The control strategy of the utility model is through to consuming the size contrast of end realtime power value and the battery-powered value of photovoltaic power supply, and decision is to the conducting of battery pack and end, the amount of power supply that guarantees the photovoltaic power supply battery pack forever less than consume end need electric weight.
The structure principle chart of the anti-contrary merit device of the parallel net type photovoltaic power supply system that the embodiment of the utility model provides is as shown in Figure 1; The anti-contrary merit device of this parallel net type photovoltaic power supply system comprises: bearing power acquisition module 101; Switch module 102; The control module 103 that is incorporated into the power networks, and photovoltaic power supply battery pack 104, AC network 105 and load 106.
Bearing power acquisition module 101 is connected with load 106, is used for the realtime power value of the load 106 of observation circuit, and the realtime power value (being monitor value) of demand is directly fed back to the control module 103 that is incorporated into the power networks.The control module that is incorporated into the power networks 103 is electrically connected with bearing power acquisition module 101; Receive the real-time bearing power value of bearing power acquisition module 101 feedbacks; The routine analyzer that the control module that is incorporated into the power networks 103 inner inputs are set in advance; The realtime power value of utilizing bearing power acquisition module 101 to obtain is carried out the numerical value contrast; And be worth immediate output power guaranteeing to provide as far as possible with bearing power under output power is less than the prerequisite of bearing power; Through the performance number (wattage) of the photovoltaic power supply battery pack 104 confirming to be connected in parallel with AC network, needing to obtain the group number of the battery subelement of conducting, and show through the charactron that is connected with photovoltaic power supply battery pack 104 or light-emitting diode battery pack number to conducting.
That is to say; Under the prerequisite of power supply gross power that guarantees photovoltaic power supply battery pack (104) less than the said realtime power value that monitors; Calculate and the immediate output power value of the said realtime power value that monitors, as the performance number of the photovoltaic power supply battery pack (104) that need be connected in parallel with AC network.The performance number of the photovoltaic power supply battery pack (104) that the control module that is incorporated into the power networks (103) is connected in parallel according to as above determined needs of method and AC network, and then need to confirm the photovoltaic power supply battery subelement of conducting.
Owing to need the output power of control photovoltaic power supply to be less than the real-time requirement power of load 106; Thereby guaranteed to form the contrary merit of 104 pairs of AC networks 105 of photovoltaic power supply battery pack, so the wattage of the photovoltaic power supply battery pack 104 that is connected in parallel is less than the realtime power value; Switch module 102 is electrically connected with the control module 103 that is incorporated into the power networks; Switch module 102 receives the control of the control module 103 that is incorporated into the power networks; Also be electrically connected to photovoltaic power supply battery pack 104 and load 106 simultaneously, control photovoltaic power supply battery pack be incorporated into the power networks power supply conducting (connections) and end (disconnection).
In a preferred embodiment; The array of photovoltaic power supply battery pack 104 is grouped into a plurality of photovoltaic power supply battery subelements; 102 pairs every group photovoltaic power supply battery of application switch module subelement is controlled; Said switch module comprises the variable connector subelement that links to each other with each group photovoltaic power supply battery subelement, and each switch subelement of said switch module is controlled by the said control module 103 that is incorporated into the power networks, and confirms the conducting of each way switch subelement and ends.
Wherein, connect between the photovoltaic power supply battery subelement on the same group, parallelly connected between group and the group, each is organized photovoltaic power supply battery subelement and is series battery, and its power determines by being equipped with from photovoltaic power supply battery number of connecting and photovoltaic power supply electric power generation cell.
In a preferred embodiment, the said control module 103 that is incorporated into the power networks is to use the single-chip microcomputer of input control program, photovoltaic power supply battery pack 104 is controlled, thus the group number of decision photovoltaic power supply battery subelement conducting.
Can also comprise among this embodiment: photovoltaic power supply power display module, the output power (wattage) of the photovoltaic power supply battery pack 104 that needs conducting that is used for the control module 103 of being incorporated into the power networks is confirmed shows, and makes the result more directly perceived.The display device of photovoltaic power supply power display module can but to be not limited to be indicator light, charactron, light-emitting diode or liquid crystal display screen.In a preferred embodiment, switch module 102 is solid-state relay control circuits, through solid-state relay to the conducting of battery pack or by controlling
The architecture principle figure of the control module that is incorporated into the power networks of the utility model, battery subelement and switch subelement is as shown in Figure 2; The corresponding component that the anti-contrary merit device of this parallel net type photovoltaic power supply system comprises is identical with Fig. 1, and wherein switch module 102 and photovoltaic power supply battery pack 104 comprise the plurality of sub unit respectively.Be specially: the first switch subelement 1021, second switch subelement 1022, the three switch subelements 1023, the four switch subelements 1024; The first battery subelement, 1041, the second battery subelements, 1042, the three battery subelements, 1043, the four battery subelements 1044; Wherein the first switch subelement 1021 is electrically connected with the first battery subelement 1041; Second switch subelement 1022 is electrically connected with the second battery subelement 1042; The 3rd switch subelement 1023 is electrically connected with the 3rd battery subelement 1043, and the 4th switch subelement 1024 is electrically connected with the 4th battery subelement 1044; The four-way switch of whole switch module is controlled by the control module that is incorporated into the power networks simultaneously; Confirm the opening and closing of each way switch; Controlled by the corresponding switch subelement with the battery subelement that the switch subelement is electrically connected each other; The conducting that realizes four road battery subelements with end, accomplish the power supply of being incorporated into the power networks.
When each the battery subelement among the embodiment 2 is 1.5 kilowatts of output power series batteries; It is 6 kilowatts output power that gross power externally can be provided; And; After confirming its break-make by the switch subelement of the control module control of being incorporated into the power networks, can realize the output power output of 0 kilowatt, 1.5 kilowatts, 3 kilowatts, 4.5 kilowatts and 6 kilowatts 5 grades, in the power supply process of realizing being incorporated into the power networks, it should be noted that the magnitude of voltage that photovoltaic power supply equipment provides should adapt with the magnitude of voltage that AC network provides.
Another kind of photovoltaic power supply battery pack configuration mode can be that power is configured by the progression growth pattern; For example can be that the first battery subelement 1041 is the series battery of 2.6 kilowatts of output powers; The second battery subelement 1042 is the series battery of 5.4 kilowatts of output powers; The 3rd battery subelement 1043 is the series battery of 10.8 kilowatts of output powers, and the 4th battery subelement 1044 is the series battery of 21.6 kilowatts of output powers.Import the realtime power value of the 103 pairs of loads of control module of being incorporated into the power networks of setting program analyzes through realization; Draw after the calculating and the immediate output power value of the realtime power value of load; Thereby the break-make of control switch (conduction and cut-off); Can realize the output power output of 16 grades; Make power supply output meticulousr, in power supply process is incorporated into the power networks in realization, it should be noted that the magnitude of voltage that photovoltaic power supply equipment provides should adapt with the magnitude of voltage that AC network provides, and the supply power voltage of each road battery subelement is identical.Equally, can show through the charactron that is connected with photovoltaic power supply battery pack 104 or light-emitting diode battery pack number conducting.
In the preferred embodiment of the utility model, use the single-chip microcomputer of input control program the photovoltaic power supply battery pack is controlled, thus the group number that decision photovoltaic power supply battery is connected.Said single-chip microcomputer is 51 type single-chip microcomputers; Said control program is the C programmer with computing, comparison, identification, controlled function.
In a preferred embodiment; Supply power with four road battery subelements; Actually can be not limited to four the tunnel, also can be the power supply of two-way battery subelement, the power supply of three road battery subelements, the power supply of five road battery subelements; Perhaps more, concrete condition can be planned for foundation according to the electrical network actual conditions of the power supply of being incorporated into the power networks.This embodiment is an example with total output power of 6 kilowatts, can be total output power of other numerical value according to the characteristics of various photovoltaic power supply equipment itself and the different situations of the power supply of being incorporated into the power networks in the reality.
Can also comprise in a preferred embodiment: photovoltaic power supply power display module, the power supply wattage of the photovoltaic power supply battery pack 104 that is used for the needs that the control module 103 of being incorporated into the power networks is confirmed are connected shows.Make the result more directly perceived.The display device of photovoltaic power supply power display module can but to be not limited to be indicator light, charactron or liquid crystal display screen.
What should explain at last is; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Although with reference to preferred embodiment the utility model is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical scheme of the utility model; And not breaking away from the spirit and the scope of the utility model technical scheme, it all should be encompassed in the middle of the claim scope of the utility model.
Claims (5)
1. the anti-contrary merit device of the photovoltaic power supply system based on solid-state relay comprises bearing power acquisition module (101), based on the switch module (102) of solid-state relay, and the control module that is incorporated into the power networks (103), photovoltaic power supply battery pack (104) is characterized in that:
Be divided into many group photovoltaic power supply battery subelements to photovoltaic power supply battery pack (104), through the input power of every group of photovoltaic power supply battery subelement and the contrast of load value, the battery pack number of decision photovoltaic power supply end conducting;
Said bearing power acquisition module (101) is used for the realtime power value of circuit load (106) is monitored;
The said control module that is incorporated into the power networks (103) is electrically connected with said bearing power acquisition module (101); The group number of the photovoltaic power supply battery pack that the said realtime power value of utilizing said bearing power acquisition module (101) monitoring to obtain is confirmed to be connected in parallel with AC network, the amount of power supply of the photovoltaic power supply battery pack (104) that guarantees to be connected in parallel is always less than said realtime power value;
Said switch module based on solid-state relay (102) is electrically connected with the said control module that is incorporated into the power networks (103), receives the said control module that is incorporated into the power networks (103) control, realizes the conducting of photovoltaic power supply battery pack (104) and ends.
2. the anti-contrary merit device of the photovoltaic power supply system based on solid-state relay as claimed in claim 1 is characterized in that connecting between the photovoltaic power supply battery subelement on the same group, group with organize between parallelly connected,
Each is organized photovoltaic power supply battery subelement and is series battery, and its power is by the photovoltaic power supply battery number and the decision of photovoltaic power supply electric power generation cell of series connection separately.
3. like the anti-contrary merit device of each described photovoltaic power supply system based on solid-state relay of claim 1-2, it is characterized in that also comprising digital display tube or light-emitting diode, the photovoltaic cell group number of conducting is shown in real time.
4. like each anti-contrary merit device of described photovoltaic power supply system of claim 1-2, it is characterized in that also comprising photovoltaic power supply power display module, be used for photovoltaic power supply power is shown in real time based on solid-state relay.
5. the anti-contrary merit device of the photovoltaic power supply system based on solid-state relay as claimed in claim 4, the display device of said photovoltaic power supply power display module comprises indicator light, in charactron or the liquid crystal display screen any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791552U CN202616799U (en) | 2011-10-09 | 2011-10-09 | Photovoltaic power supply system reverse power prevention apparatus based on solid-state relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203791552U CN202616799U (en) | 2011-10-09 | 2011-10-09 | Photovoltaic power supply system reverse power prevention apparatus based on solid-state relay |
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| Publication Number | Publication Date |
|---|---|
| CN202616799U true CN202616799U (en) | 2012-12-19 |
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|---|---|---|---|
| CN2011203791552U Expired - Fee Related CN202616799U (en) | 2011-10-09 | 2011-10-09 | Photovoltaic power supply system reverse power prevention apparatus based on solid-state relay |
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| Country | Link |
|---|---|
| CN (1) | CN202616799U (en) |
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2011
- 2011-10-09 CN CN2011203791552U patent/CN202616799U/en not_active Expired - Fee Related
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