CN110912111A - Input single-path and multi-path automatic identification circuit for photovoltaic energy storage system - Google Patents
Input single-path and multi-path automatic identification circuit for photovoltaic energy storage system Download PDFInfo
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- 238000005070 sampling Methods 0.000 claims abstract description 74
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- 230000005611 electricity Effects 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention relates to the technical field of energy storage system application, and discloses an input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system. The invention comprises a PV sampling circuit, a difference circuit and a comparison circuit which are electrically connected in sequence; the PV sampling circuit is used for receiving the output voltage from the photovoltaic energy storage circuit and outputting two paths of sampling voltage signals; the difference calculating circuit is used for two paths of sampling voltage signals and outputting voltage deviation values corresponding to the two paths of sampling voltage signals; the comparison circuit is used for receiving the voltage deviation value, then comparing the voltage deviation value with the threshold voltage to obtain a comparison result, and outputting a high-level or low-level voltage signal according to the comparison result. The invention meets the wiring mode of different families, is suitable for the single-path or multi-path household input wiring end and the photovoltaic energy storage system and the photovoltaic panel and the energy storage battery, does not need to change the circuit configuration or redistribute the photovoltaic panel, saves the configuration cost of the whole system and avoids the resource waste.
Description
Technical Field
The invention relates to the technical field of energy storage system application, in particular to an input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system.
Background
The existing photovoltaic energy storage system utilizes sunlight to generate electricity or charge an energy storage battery, and then discharges electricity through the energy storage battery to supply energy to power supply equipment at night or in rainy days. The existing photovoltaic energy storage system is single in application scene and cannot meet the intelligent requirement and the wiring input requirement under the complex condition of the current family. Most photovoltaic energy storage systems only have fixed circuits of input, the current input by each circuit is in a fixed range, and when the power consumption family only has one circuit of photovoltaic input and the input current is greater than the maximum input current of each circuit, if the application is needed, the number of photovoltaic panels in the photovoltaic energy storage system can be changed or the configuration can be changed, so that the use cost is increased; meanwhile, when the number of paths input by the photovoltaic panel in the photovoltaic energy storage system is more than the fixed number of paths of the energy storage battery, if the application is needed, the input of the photovoltaic panel with redundant paths can be wasted or the configuration of the photovoltaic panel is changed, so that the cost is still increased and the resource is wasted.
Disclosure of Invention
In order to solve one of the problems in the prior art, the invention provides an input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system, which does not need an external power supply and has a communication function, can meet the requirements in different application scenes, does not need to change the circuit configuration or redistribute a photovoltaic panel, can be used by directly accessing the photovoltaic energy storage system no matter whether the household wiring mode is single-path input or multi-path input, and avoids the cost increase or resource waste.
The technical scheme adopted by the invention is as follows:
an input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system comprises a PV sampling circuit, a difference circuit and a comparison circuit which are electrically connected in sequence;
the PV sampling circuit is used for receiving the output voltage from the photovoltaic energy storage circuit and outputting two paths of sampling voltage signals, and the PV sampling circuit is respectively and electrically connected with the photovoltaic output end of the photovoltaic energy storage system and the power supply;
the difference calculating circuit is used for receiving the two paths of sampling voltage signals from the PV sampling circuit and outputting voltage deviation values corresponding to the two paths of sampling voltage signals, and the difference calculating circuit is electrically connected with the PV sampling circuit, the fixed voltage signal end and the power supply respectively;
the comparison circuit is used for receiving the voltage deviation value from the difference calculating circuit, then comparing the voltage deviation value with the threshold voltage to obtain a comparison result, and outputting a high-level or low-level voltage signal according to the comparison result, and the comparison circuit is respectively electrically connected with the difference calculating circuit, the threshold voltage end and the power supply.
Preferably, the device also comprises a precise full-wave rectifying circuit; the precise full-wave rectification circuit is used for converting the voltage deviation value of the negative value into a positive value and outputting the voltage deviation positive value, and the precise full-wave rectification circuit is respectively electrically connected with the difference circuit, the fixed voltage signal end and the power supply; and the comparison circuit is electrically connected with the signal output end of the precise full-wave rectification circuit.
Preferably, the PV sampling circuit includes a first sampling circuit and a second sampling circuit;
the first sampling circuit comprises a first operational amplifier U23-C; the first photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with the positive phase end of the first operational amplifier U23-C through a first divider resistor; a first negative feedback resistor R92 is connected in parallel between the output end and the inverting end of the first operational amplifier U23-C; the inverting terminal of the first operational amplifier U23-C is grounded through a first bias resistor; the output end of the first operational amplifier U23-C outputs a first path of sampling voltage signal PV _ V1;
the second sampling circuit comprises a second operational amplifier U23-B; a second photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with a positive phase end of a second operational amplifier U23-B through a second voltage-dividing resistor; a second negative feedback resistor R254 is connected in parallel between the inverting end of the second operational amplifier U23-B and the output end thereof; the inverting terminal of the second operational amplifier U23-B is grounded through a second bias resistor; the output end of the second operational amplifier U23-B outputs a second sampled voltage signal PV _ V2.
Preferably, the difference circuit comprises a third operational amplifier U14; the first path of sampling voltage signal PV _ V1 output by the first sampling circuit is transmitted to the inverting terminal of the third operational amplifier U14 through the first resistor R310; the second path of sampling voltage signal PV _ V2 output by the second sampling circuit passes through the second circuitThe resistor R311 is connected to the non-inverting terminal of the third operational amplifier U14; the fixed voltage signal end is electrically connected with the non-inverting end of the third operational amplifier U14 through a third resistor R313; a third negative feedback resistor R312 is connected in parallel between the inverting end of the third operational amplifier U14 and the output end thereof; the output end of the third operational amplifier U14 outputs a voltage deviation value V between the first sampled voltage signal PV _ V1 and the second sampled voltage signal PV _ V201。
Preferably, the precision full-wave rectification circuit comprises a fourth operational amplifier U9; voltage deviation value V output by difference circuit01The voltage is transmitted to the inverting terminal of a fourth operational amplifier U9 through a fourth resistor R321; a fourth feedback resistor R326 is connected in parallel between the output end and the inverting end of the fourth operational amplifier U9; the fixed voltage signal end is electrically connected with the non-inverting end of the fourth operational amplifier U9 through a fifth resistor R329; the output end of the fourth operational amplifier U9 outputs a voltage deviation positive value V02。
Preferably, the comparison circuit comprises a comparison amplifier U28; output voltage deviation positive value V output by precise full-wave rectification circuit02The voltage is transmitted to the inverting end of a comparison amplifier U28 through a sixth resistor; the threshold voltage end is electrically connected with the non-inverting end of the comparison amplifier U28 through a third voltage-dividing resistor; the output end of the comparison amplifier U28 outputs a voltage signal PV _ CTL.
Preferably, the threshold voltage end outputs +3.3V voltage; and the threshold voltage can be obtained by adjusting the third voltage-dividing resistor.
The invention has the beneficial effects that:
the PV sampling circuit, the difference circuit and the comparison circuit are matched for use, so that wiring modes of different families are met, the photovoltaic solar cell module can be suitable for single-path and multi-path household input wiring terminals and between a photovoltaic energy storage system and photovoltaic panels and energy storage cells, line configuration does not need to be changed or the photovoltaic panels do not need to be redistributed, configuration cost of the whole system is saved, and resource waste is avoided; the invention reduces the configuration workload and the configuration cost, avoids resource waste, meets the requirements of different families to the maximum extent, is simple, effective, convenient and quick, and is suitable for popularization and use.
Other advantageous effects of the present invention will be described in detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block circuit diagram of the present invention;
FIG. 2 is a circuit schematic of the PV sampling circuit of the present invention;
FIG. 3 is a circuit schematic of the differencing circuit of the present invention;
FIG. 4 is a schematic circuit diagram of a precision full wave rectifier circuit according to the present invention;
fig. 5 is a circuit schematic of the comparison circuit of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time; for the term "/and" as may appear herein, which describes another associative object relationship, it means that two relationships may exist, e.g., a/and B, may mean: a exists independently, and A and B exist independently; in addition, for the character "/" that may appear herein, it generally means that the former and latter associated objects are in an "or" relationship.
It will be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Conversely, if a unit is referred to herein as being "directly connected" or "directly coupled" to another unit, it is intended that no intervening units are present. In addition, other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
It should be understood that specific details are provided in the following description to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
Example 1:
as shown in fig. 1, the present embodiment provides an input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system, which includes a PV sampling circuit, a difference circuit, and a comparison circuit, which are electrically connected in sequence;
the PV sampling circuit is used for receiving the output voltage from the photovoltaic energy storage circuit and outputting two paths of sampling voltage signals, and the PV sampling circuit is respectively electrically connected with the photovoltaic output end of the photovoltaic energy storage system and the power supply;
the difference calculating circuit is used for receiving the two paths of sampling voltage signals from the PV sampling circuit and outputting voltage deviation values corresponding to the two paths of sampling voltage signals, and the difference calculating circuit is respectively electrically connected with the PV sampling circuit, the fixed voltage signal end and the power supply;
the comparison circuit is used for receiving the voltage deviation value from the difference calculating circuit, then comparing the voltage deviation value with the threshold voltage to obtain a comparison result, and outputting a high-level or low-level voltage signal according to the comparison result, and the comparison circuit is respectively electrically connected with the difference calculating circuit, the threshold voltage end and the power supply.
In this embodiment, the input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system further comprises a precise full-wave rectification circuit; the precise full-wave rectification circuit is used for converting the voltage deviation value of the negative value into a positive value and outputting the voltage deviation positive value, and the precise full-wave rectification circuit is respectively electrically connected with the difference circuit, the fixed voltage signal end and the power supply; the comparison circuit is electrically connected with the signal output end of the precise full-wave rectification circuit.
In specific use, when the home input wiring mode is a single-path mode, the home input wiring method can automatically identify and execute the working mode of single-path input, so that the wiring mode of single-path input is met, the electric appliance can normally work, and the original wiring configuration does not need to be manually changed; similarly, when the household input wiring mode is multipath, the invention also automatically identifies and executes the working mode of multipath input; when the number of output paths of the photovoltaic panels is larger than that of the energy storage batteries, all the photovoltaic panel outputs are connected in a terminal block with single-path input, the working mode of the single-path input is executed, the input current of the terminal with the single-path input is larger, the large-current input can be met, the problem that redundant photovoltaic panels cannot be used is avoided, the configuration of the photovoltaic panels does not need to be changed, or the input lines do not need to be changed to meet the number of input paths of energy storage products, and the workload and the cost are increased.
As shown in fig. 2, in the present embodiment, the PV sampling circuit includes a first sampling circuit and a second sampling circuit; when photovoltaic access is carried out, strong electricity is changed into weak electricity through resistance voltage division, and two paths of sampling voltage signals are obtained after the strong electricity is amplified by the first operational amplifier U23-C and the second operational amplifier U23-B.
The first sampling circuit comprises a first operational amplifier U23-C; the first photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with the positive phase end of the first operational amplifier U23-C through a first divider resistor; a first negative feedback resistor R92 is connected in parallel between the output end and the inverting end of the first operational amplifier U23-C; the inverting terminal of the first operational amplifier U23-C is grounded through a first bias resistor; the output end of the first operational amplifier U23-C outputs a first path of sampling voltage signal PV _ V1;
the second sampling circuit comprises a second operational amplifier U23-B; a second photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with a positive phase end of a second operational amplifier U23-B through a second voltage-dividing resistor; a second negative feedback resistor R254 is connected in parallel between the inverting end of the second operational amplifier U23-B and the output end thereof; the inverting terminal of the second operational amplifier U23-B is grounded through a second bias resistor; the output terminal of the second operational amplifier U23-B outputs a second sampled voltage signal PV _ V2.
As a preferred embodiment, the first operational amplifier U23-C and the second operational amplifier U23-B adopt a double operational amplifier chip with the model number TL0741 DR.
As shown in fig. 3, in the present embodiment, the difference circuit includes a third operational amplifier U14; the first path of sampling voltage signal PV _ V1 output by the first sampling circuit is transmitted to the inverting terminal of the third operational amplifier U14 through the first resistor R310; the second path of sampling voltage signal PV _ V2 output by the second sampling circuit is transmitted to the non-inverting terminal of the third operational amplifier U14 through the second resistor R311; the fixed voltage signal end is electrically connected with the non-inverting end of the third operational amplifier U14 through a third resistor R313; a third negative feedback resistor R312 is connected in parallel between the inverting end of the third operational amplifier U14 and the output end thereof; the output end of the third operational amplifier U14 outputs a voltage deviation value V between the first sampled voltage signal PV _ V1 and the second sampled voltage signal PV _ V201。
In another preferred embodiment, the third operational amplifier U14 is an operational amplifier chip with a model number 0P07 DRZ.
As shown in fig. 4, in the present embodiment, the precision full-wave rectification circuit includes a fourth operational amplifier U9; voltage deviation value V output by difference circuit01The voltage is transmitted to the inverting terminal of a fourth operational amplifier U9 through a fourth resistor R321; a fourth feedback resistor R326 is connected in parallel between the output end and the inverting end of the fourth operational amplifier U9; the fixed voltage signal end is electrically connected with the non-inverting end of the fourth operational amplifier U9 through a fifth resistor R329; the output voltage deviation positive value V of the output end of the fourth operational amplifier U902. It should be noted that the voltage deviation value obtained by the difference circuit may be a negative value or a positive value, and when the voltage deviation value is a negative value, the negative value needs to be changed to the positive value by the precision full-wave rectifying circuit, and the magnitude of the voltage deviation value is not affected.
In another preferred embodiment, the fourth operational amplifier U9 is a dual op-amp chip model TL0741 DR.
As shown in fig. 5, in the present embodiment, the comparison circuit includes a comparison amplifier U28; output voltage deviation positive value V output by precise full-wave rectification circuit02Transmitted to the comparator amplifier U28 through a sixth resistorAn inverting terminal; the threshold voltage end is electrically connected with the non-inverting end of the comparison amplifier U28 through a third voltage-dividing resistor; the voltage signal PV _ CTL output from the output of the comparator amplifier U28. In this embodiment, the threshold voltage terminal outputs +3.3V voltage; and the threshold voltage can be obtained by adjusting the third voltage-dividing resistor.
In another preferred embodiment, the comparison amplifier U28 is a comparison amplifier chip model LM2903DR 2G.
For example, the working process of the input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system in this embodiment is as follows:
1) the power supply (commercial power) is electrified and is awakened the system, when not inserting the photovoltaic, the working process as follows:
the voltage of the PV1 is 0, and a first path of sampling voltage signal PV _ V1 output by the first sampling circuit is 0V; similarly, the second path of sampling voltage signal PV _ V2 output by the second sampling circuit is 0V; v is obtained through a difference circuit and a precise full-wave rectification circuit02＝V01Assume that the threshold voltage is 1.65V and the fixed voltage signal at the fixed voltage signal terminal is 1.5V; due to 1.5V<1.65V, after comparison by the comparison circuit, the voltage signal PV _ CTL output by pin 1 of the comparison amplifier U28 is at a high level, namely the system starts to default the connection mode of photovoltaic access to be single-path input;
2) when the photovoltaic energy storage system is connected and awakened and power is not output, the working process is as follows:
two paths of photovoltaic voltages are connected, the first path is directly connected to a PV1 input switch, the second path is directly connected to a PV2 input switch, the first path of input voltage PV1 is assumed to be 160V, the second path of input voltage PV2 is assumed to be 150V, the first path of sampling voltage signal PV _ V1 output by the first sampling circuit is 0.954V, and similarly, the second path of sampling voltage signal PV _ V2 output by the second sampling circuit is 0.895V; v is obtained through a difference circuit and a precise full-wave rectification circuit021.793V, assume a threshold voltage of 1.65V; due to 1.793V>1.65V, after comparison by a comparison circuit, pulling down a voltage signal PV _ CTL output by a pin 1 of a comparison amplifier U28 to be a low level, namely, judging that the wiring mode of the photovoltaic access of the system at the moment is double-path input;
3) when the photovoltaic energy storage system is connected and awakened and the power is output in a single path, the working process is as follows
A single-path photovoltaic (the open-circuit voltage is 160V) passes through the PV input terminal station, and then is divided into two paths to be connected into a system through the PV1 input switch and the PV2 input switch. The first path of input voltage PV1 outputs power first, assuming that the working voltage PV1 is 155V, because a single path is divided into two paths, the second path of input voltage PV2 is also 155V, the first path of sampling voltage signal PV _ V1 output by the first sampling circuit is 0.924V, and the second path of sampling voltage signal PV _ V2 output by the second sampling circuit is 0.924V in the same way; v is obtained through a difference circuit and a precise full-wave rectification circuit021.5V, assuming a threshold voltage of 1.65V; due to 1.5V<1.65V, after comparison by the comparison circuit, the voltage signal PV _ CTL output by pin 1 of the comparison amplifier U28 is a high-level signal, that is, the wiring mode of the system photovoltaic access at this time is determined to be single-path input.
The various embodiments described above are merely illustrative, and may or may not be physically separate, as they relate to elements illustrated as separate components; if reference is made to a component displayed as a unit, it may or may not be a physical unit, and may be located in one place or distributed over a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Finally, it should be noted that the present invention is not limited to the above alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (7)
1. An input single-path and multi-path automatic identification circuit for a photovoltaic energy storage system is characterized in that: the PV sampling circuit, the difference circuit and the comparison circuit are electrically connected in sequence;
the PV sampling circuit is used for receiving the output voltage from the photovoltaic energy storage circuit and outputting two paths of sampling voltage signals, and the PV sampling circuit is respectively and electrically connected with the photovoltaic output end of the photovoltaic energy storage system and the power supply;
the difference calculating circuit is used for receiving the two paths of sampling voltage signals from the PV sampling circuit and outputting voltage deviation values corresponding to the two paths of sampling voltage signals, and the difference calculating circuit is electrically connected with the PV sampling circuit, the fixed voltage signal end and the power supply respectively;
the comparison circuit is used for receiving the voltage deviation value from the difference calculating circuit, then comparing the voltage deviation value with the threshold voltage to obtain a comparison result, and outputting a high-level or low-level voltage signal according to the comparison result, and the comparison circuit is respectively electrically connected with the difference calculating circuit, the threshold voltage end and the power supply.
2. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 1, wherein: the device also comprises a precise full-wave rectifying circuit;
the precise full-wave rectification circuit is used for converting the voltage deviation value of the negative value into a positive value and outputting the voltage deviation positive value, and the precise full-wave rectification circuit is respectively electrically connected with the difference circuit, the fixed voltage signal end and the power supply; and the comparison circuit is electrically connected with the signal output end of the precise full-wave rectification circuit.
3. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 2, wherein: the PV sampling circuit comprises a first sampling circuit and a second sampling circuit;
the first sampling circuit comprises a first operational amplifier U23-C; the first photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with the positive phase end of the first operational amplifier U23-C through a first divider resistor; a first negative feedback resistor R92 is connected in parallel between the output end and the inverting end of the first operational amplifier U23-C; the inverting terminal of the first operational amplifier U23-C is grounded through a first bias resistor; the output end of the first operational amplifier U23-C outputs a first path of sampling voltage signal PV _ V1;
the second sampling circuit comprises a second operational amplifier U23-B; a second photovoltaic output end of the photovoltaic energy storage system and the power supply are respectively and electrically connected with a positive phase end of a second operational amplifier U23-B through a second voltage-dividing resistor; a second negative feedback resistor R254 is connected in parallel between the inverting end of the second operational amplifier U23-B and the output end thereof; the inverting terminal of the second operational amplifier U23-B is grounded through a second bias resistor; the output end of the second operational amplifier U23-B outputs a second sampled voltage signal PV _ V2.
4. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 3, wherein: the difference circuit comprises a third operational amplifier U14; the first path of sampling voltage signal PV _ V1 output by the first sampling circuit is transmitted to the inverting terminal of the third operational amplifier U14 through the first resistor R310; the second path of sampling voltage signal PV _ V2 output by the second sampling circuit is transmitted to the non-inverting terminal of the third operational amplifier U14 through the second resistor R311; the fixed voltage signal end is electrically connected with the non-inverting end of the third operational amplifier U14 through a third resistor R313; a third negative feedback resistor R312 is connected in parallel between the inverting end of the third operational amplifier U14 and the output end thereof; the output end of the third operational amplifier U14 outputs a voltage deviation value V between the first sampled voltage signal PV _ V1 and the second sampled voltage signal PV _ V201。
5. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 4, wherein: the precise full-wave rectifying circuit comprises a fourth operational amplifier U9; voltage deviation value V output by difference circuit01The voltage is transmitted to the inverting terminal of a fourth operational amplifier U9 through a fourth resistor R321; a fourth feedback resistor R326 is connected in parallel between the output end and the inverting end of the fourth operational amplifier U9; the fixed voltage signal end is electrically connected with the non-inverting end of the fourth operational amplifier U9 through a fifth resistor R329; the output end of the fourth operational amplifier U9 outputs a voltage deviation positive value V02。
6. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 5, wherein: the comparison circuit comprises a comparison amplifier U28; output voltage deviation positive value V output by precise full-wave rectification circuit02The voltage is transmitted to the inverting end of a comparison amplifier U28 through a sixth resistor; the threshold voltage end is electrically connected with the non-inverting end of the comparison amplifier U28 through a third voltage-dividing resistor; the output end of the comparison amplifier U28 outputs a voltage signal PV _ CTL.
7. The input single-path and multi-path automatic identification circuit for the photovoltaic energy storage system according to claim 6, wherein: the threshold voltage end outputs +3.3V voltage; and the threshold voltage can be obtained by adjusting the third voltage-dividing resistor.
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| CN106451730A (en) * | 2016-11-24 | 2017-02-22 | 南京科技职业学院 | Solar cell charging circuit |
| CN106786769A (en) * | 2017-01-19 | 2017-05-31 | 江苏绿国新能源科技有限公司 | Familial distribution of cases formula photovoltaic energy conversion equipment |
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| JP2002051029A (en) * | 2000-08-02 | 2002-02-15 | Mitsubishi Electric Corp | Wavelength identification unit in optical multiplex transmission system |
| CN202797008U (en) * | 2012-06-12 | 2013-03-13 | 特变电工新疆新能源股份有限公司 | Photovoltaic array combiner box |
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| CN106451730A (en) * | 2016-11-24 | 2017-02-22 | 南京科技职业学院 | Solar cell charging circuit |
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