CN214380236U - Solar charging anti-backflow circuit and system - Google Patents
Solar charging anti-backflow circuit and system Download PDFInfo
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- CN214380236U CN214380236U CN202120538431.9U CN202120538431U CN214380236U CN 214380236 U CN214380236 U CN 214380236U CN 202120538431 U CN202120538431 U CN 202120538431U CN 214380236 U CN214380236 U CN 214380236U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a solar charging anti-backflow circuit and a system, wherein the solar charging anti-backflow circuit comprises a first voltage division circuit, a second voltage division circuit, a logic judgment circuit and an anti-backflow circuit; the first voltage division circuit is connected with the solar photovoltaic panel and the logic judgment circuit and is used for outputting a first voltage signal to the logic judgment circuit; the second voltage division circuit is connected with the storage battery, the logic judgment circuit and the backflow prevention circuit and is used for outputting a second voltage signal to the logic judgment circuit; the logic judgment circuit is used for acquiring the first voltage signal and the second voltage signal and generating a backflow prevention control signal; and the backflow preventing circuit is connected with the solar photovoltaic panel, the logic judging circuit and the storage battery and is used for acquiring a backflow preventing control signal and performing backflow preventing protection on the solar photovoltaic panel. According to the technical scheme, the anti-backflow protection circuit can timely perform the anti-backflow protection on the storage battery according to the anti-backflow control signal sent by the logic judgment circuit, and the reliability of the anti-backflow protection on the storage battery is improved.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field especially relates to a solar charging prevents flowing backward circuit and system.
Background
With the popularization of the photovoltaic industry, more and more storage batteries in electronic products are charged by adopting a solar photovoltaic panel. Because the output voltage of the solar photovoltaic panel is greatly influenced by the illumination condition, the electric energy output by the solar photovoltaic panel needs to be stored in the storage battery through the rectifying circuit. However, since the solar photovoltaic panel directly charges the storage battery through the rectifying circuit, the current of the storage battery flows back to the solar photovoltaic panel through the rectifying circuit in a non-charging state, which causes the waste of energy of the storage battery. Therefore, a solar charging anti-backflow circuit is required to be added between the solar photovoltaic panel and the storage battery to solve the above problems.
At present, the solar charging anti-backflow circuit generally adopts the following modes: firstly, externally connecting a Schottky diode at the output end of the solar photovoltaic panel to charge a storage battery and prevent the current of the storage battery from flowing back to the solar photovoltaic panel; and secondly, the solar photovoltaic panel charges the storage battery by controlling the MOS tube through the single chip microcomputer. For example, the single chip microcomputer detects the states of the solar photovoltaic panel and the storage battery to control the switch of the MOS tube to charge the storage battery, so that the current of the storage battery is prevented from flowing back to the solar photovoltaic panel. However, the conduction voltage drop of the schottky diode is between 0.4 and 0.7V, which causes considerable energy loss on the schottky diode, and particularly in the application occasions of high power and large current, the loss of the schottky diode is larger, the heat generated by the schottky diode is more serious when the loss is larger, and the reliability of the schottky diode is influenced; in addition, the solar photovoltaic panel charges the storage battery by controlling the MOS tube through the single chip microcomputer, and higher cost is needed.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a solar charging prevents flowing backward circuit and system to it is poor to solve current solar charging prevents flowing backward circuit reliability, the higher problem of cost.
A solar charging anti-backflow circuit is connected with a solar photovoltaic panel and a storage battery and comprises a first voltage division circuit, a second voltage division circuit, a logic judgment circuit and an anti-backflow circuit;
the first voltage division circuit is connected with the solar photovoltaic panel and the logic judgment circuit and is used for outputting a first voltage signal to the logic judgment circuit;
the second voltage division circuit is connected with the storage battery, the logic judgment circuit and the backflow prevention circuit and is used for outputting a second voltage signal to the logic judgment circuit;
the logic judgment circuit is used for acquiring a first voltage signal and a second voltage signal and generating a backflow prevention control signal;
the backflow prevention circuit is connected with the solar photovoltaic panel, the logic judgment circuit and the storage battery and used for acquiring the backflow prevention control signal and performing backflow prevention protection on the solar photovoltaic panel.
Further, the first voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor which are connected in series; the first voltage-dividing resistor and the second voltage-dividing resistor are respectively connected with the anode and the cathode of the solar photovoltaic panel;
and a connection node between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with a first input end of the logic judgment circuit.
Further, the second voltage division circuit comprises a third voltage division resistor and a fourth voltage division resistor which are connected in series; the third voltage dividing resistor and the fourth voltage dividing resistor are respectively connected with the anode and the cathode of the storage battery;
and a connection node between the third voltage dividing resistor and the fourth voltage dividing resistor is connected with a second input end of the logic judgment circuit.
Further, the logic judgment circuit comprises an operational amplifier;
the first input end of the operational amplifier is connected with the first voltage division circuit, the second input end of the operational amplifier is connected with the second voltage division circuit, the signal output end of the operational amplifier is connected with the backflow prevention circuit, and the power supply end of the operational amplifier is connected with the anode of the solar photovoltaic panel.
Furthermore, the logic judgment circuit also comprises a voltage stabilizing resistor and a voltage stabilizing capacitor;
the first end of the voltage stabilizing resistor is connected with the anode of the solar photovoltaic panel, and the second end of the voltage stabilizing resistor is connected with the power supply end of the operational amplifier and the first end of the voltage stabilizing capacitor;
and the second end of the voltage stabilizing capacitor is connected with the grounding end.
Furthermore, the backflow prevention circuit comprises a control circuit and a protection circuit;
the control circuit is connected with the logic judgment circuit and the protection circuit;
the protection circuit is connected with the solar photovoltaic panel, the positive electrode and the storage battery.
Further, the control circuit includes a first driving resistor and a first transistor;
the first end of the first driving resistor is connected with the logic judgment circuit, and the second end of the first driving resistor is connected with the first end of the first transistor;
and the second end of the first transistor is connected with the protection circuit, and the third end of the first transistor is connected with a grounding end.
Further, the protection circuit includes a second transistor and a second driving resistor;
the first end of the second transistor is connected with the control circuit and the first end of the second driving resistor, the second end of the second transistor is connected with the anode of the solar photovoltaic panel, and the third end of the second transistor is connected with the storage battery;
and the second end of the second driving resistor is connected with the storage battery.
Further, the second transistor is a field effect transistor.
A solar charging anti-backflow system comprises a solar photovoltaic panel, a storage battery and the solar charging anti-backflow circuit.
The solar charging anti-backflow circuit and system are characterized in that the logic judgment circuit compares a first voltage signal sent by the first voltage division circuit with a second voltage signal sent by the second voltage division circuit, if the first voltage signal is greater than the second voltage signal, the solar photovoltaic panel voltage is greater than the storage battery voltage, and the logic judgment circuit generates a high-level signal; if the first voltage signal is not greater than the second voltage signal, the solar photovoltaic panel voltage is not greater than the storage battery voltage, and the logic judgment circuit generates a low level signal; the backflow prevention circuit starts to be conducted when the backflow prevention control signal is a high-level signal according to the backflow prevention control signal sent by the logic judgment circuit, and the solar photovoltaic panel charges the storage battery. When the backflow prevention control signal is a low level signal, the backflow prevention circuit starts to be closed, backflow prevention protection is performed on the storage battery, and therefore current of the storage battery is prevented from flowing back into the solar photovoltaic panel. The anti-backflow circuit can timely perform anti-backflow protection on the storage battery according to the anti-backflow control signal sent by the logic judgment circuit, and the reliability of the anti-backflow protection on the storage battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and 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 these drawings without inventive labor.
Fig. 1 is a circuit diagram of a solar charging anti-backflow circuit 40 according to an embodiment of the present invention.
In the figure: 10. a first voltage dividing circuit; 20. a second voltage dividing circuit; 30. a logic judgment circuit; 40. a backflow prevention circuit; 41. a control circuit; 42. and a protection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity to indicate like elements throughout.
It will be understood that when an element or layer is referred to as being "on" …, "adjacent to …," "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on …," "directly adjacent to …," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatial relationship terms such as "under …", "under …", "below", "under …", "above …", "above", and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "below …" and "below …" can encompass both an orientation of up and down. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting 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" and/or "comprising," when used in this specification, 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, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In order to provide a thorough understanding of the present invention, detailed structures and steps will be provided in the following description so as to explain the technical solution provided by the present invention. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
As shown in fig. 1, the present embodiment provides a solar charging anti-backflow circuit 40, which is connected to a solar photovoltaic panel and a battery BAT, wherein the solar charging anti-backflow circuit 40 includes a first voltage dividing circuit 10, a second voltage dividing circuit 20, a logic determining circuit 30 and an anti-backflow circuit 40; the first voltage division circuit 10 is connected with the solar photovoltaic panel and the logic judgment circuit 30 and is used for outputting a first voltage signal to the logic judgment circuit 30; the second voltage division circuit 20 is connected with the storage battery BAT, the logic judgment circuit 30 and the backflow prevention circuit 40, and is used for outputting a second voltage signal to the logic judgment circuit 30; the logic judgment circuit 30 is used for acquiring the first voltage signal and the second voltage signal and generating a backflow prevention control signal; and the backflow prevention circuit 40 is connected with the solar photovoltaic panel, the logic judgment circuit 30 and the storage battery BAT and is used for acquiring a backflow prevention control signal and performing backflow prevention protection on the solar photovoltaic panel.
As an example, the first voltage dividing circuit 10 is connected to the solar photovoltaic panel and the logic determining circuit 30, and is configured to output a first voltage signal to the logic determining circuit 30; and the second voltage division circuit 20 is connected to the battery BAT, the logic judgment circuit 30 and the backflow prevention circuit 40, and is configured to output a second voltage signal to the logic judgment circuit 30. The logic judgment circuit 30 compares the first voltage signal with the second voltage signal, if the first voltage signal is greater than the second voltage signal, it indicates that the voltage of the solar photovoltaic panel is greater than the voltage of the storage battery BAT, and the logic judgment circuit 30 generates a high level signal; if the first voltage signal is not greater than the second voltage signal, it indicates that the voltage of the solar photovoltaic panel is not greater than the voltage of the storage battery BAT, and the logic judgment circuit 30 generates a low level signal. Because the anti-backflow circuit 40 is connected with the solar photovoltaic panel, the logic judgment circuit 30 and the storage battery BAT, if the anti-backflow control signal acquired by the anti-backflow circuit 40 is a high-level signal, that is, the first voltage signal is greater than the second voltage signal, the voltage of the solar photovoltaic panel is greater than the voltage of the storage battery BAT, the anti-backflow circuit 40 starts to be switched on, and the solar photovoltaic panel charges the storage battery BAT. If the anti-backflow control signal acquired by the anti-backflow circuit 40 is a low level signal, that is, the first voltage signal is not greater than the second voltage signal, the voltage of the solar photovoltaic panel is not greater than the voltage of the storage battery BAT, the anti-backflow circuit 40 starts to be turned off, and anti-backflow protection is performed on the storage battery BAT, that is, the current of the storage battery BAT is prevented from flowing back to the solar photovoltaic panel. So, this solar charging prevents flowing backward circuit 40 has replaced the current direct schottky diode that adopts to prevent flowing backward protection to battery BAT to and replaced the mode that adopts single chip microcomputer control MOS pipe to prevent flowing backward protection to battery BAT, improve the reliability to prevent flowing backward protection to battery BAT, the cost has been reduced simultaneously.
In this embodiment, the logic determining circuit 30 compares the first voltage signal sent by the first voltage dividing circuit 10 with the second voltage signal sent by the second voltage dividing circuit 20, and if the first voltage signal is greater than the second voltage signal, it indicates that the solar photovoltaic panel voltage is greater than the battery BAT voltage, and the logic determining circuit 30 generates a high level signal; if the first voltage signal is not greater than the second voltage signal, it indicates that the voltage of the solar photovoltaic panel is not greater than the voltage of the storage battery BAT, and the logic judgment circuit 30 generates a low level signal; the backflow prevention circuit 40 starts to be switched on when the backflow prevention control signal is a high level signal according to the backflow prevention control signal sent by the logic judgment circuit 30, and the solar photovoltaic panel charges the battery BAT. When the backflow prevention control signal is a low level signal, the backflow prevention circuit 40 starts to be turned off to perform backflow prevention protection on the storage battery BAT, that is, to prevent the current of the storage battery BAT from flowing back into the solar photovoltaic panel. The backflow prevention circuit 40 can timely perform backflow prevention protection on the storage battery BAT according to the backflow prevention control signal sent by the logic judgment circuit 30, and reliability of backflow prevention protection on the storage battery BAT is improved.
In one embodiment, as shown in fig. 1, the first voltage dividing circuit 10 includes a first voltage dividing resistor R11 and a second voltage dividing resistor R12 connected in series; the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 are respectively connected with the anode and the cathode of the solar photovoltaic panel; the connection node between the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 is connected to the first input terminal of the logic determination circuit 30.
In the embodiment, the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 are respectively connected with the anode and the cathode of the solar photovoltaic panel; the connection node between the first voltage-dividing resistor R11 and the second voltage-dividing resistor R12 is connected to the first input terminal of the logic determination circuit 30. When the solar photovoltaic panel starts to work, the first voltage division resistor R11 and the second voltage division resistor R12 divide the voltage of the solar photovoltaic panel, and a first voltage signal is input to the first input end of the logic judgment circuit 30 through a connection node between the first voltage division resistor R11 and the second voltage division resistor R12, so that the relative magnitude of the voltage of the solar photovoltaic panel is reflected. Therefore, the logic judgment circuit 30 can judge the relative size of the solar photovoltaic panel voltage and the battery BAT voltage through the first voltage signal and the second voltage signal, and then control the anti-backflow protection circuit 42 to perform anti-backflow protection on the battery BAT, so that the reliability of the anti-backflow protection on the battery BAT is improved.
In one embodiment, as shown in fig. 1, the second voltage dividing circuit 20 includes a third voltage dividing resistor R21 and a fourth voltage dividing resistor R22 connected in series; the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 are connected to the positive electrode and the negative electrode of the battery BAT, respectively; the connection node between the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 is connected to the second input terminal of the logic determination circuit 30.
In the present embodiment, the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 are connected to the positive electrode and the negative electrode of the battery BAT, respectively; the connection node between the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 is connected to the second input terminal of the logic determination circuit 30. The third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 divide the voltage of the battery BAT, and a second voltage signal is input to the second input terminal of the logic determination circuit 30 through a connection node between the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22, so as to reflect the relative magnitude of the voltage of the battery BAT. Therefore, the logic judgment circuit 30 can judge the relative size of the solar photovoltaic panel voltage and the battery BAT voltage through the first voltage signal and the second voltage signal, and then control the anti-backflow protection circuit 42 to perform anti-backflow protection on the battery BAT, so that the reliability of the anti-backflow protection on the battery BAT is improved.
In one embodiment, as shown in FIG. 1, the logic decision circuit 30 includes an operational amplifier IC; the first input end of the operational amplifier IC is connected with the first voltage division circuit 10, the second input end is connected with the second voltage division circuit 20, the signal output end is connected with the backflow prevention circuit 40, and the power supply end is connected with the anode of the solar photovoltaic panel.
The operational amplifier IC includes, but is not limited to, a single operational amplifier IC, a dual operational amplifier IC, a quad operational amplifier IC, and the like. Preferably, the operational amplifier IC in the present embodiment may be a dual operational amplifier IC.
In this embodiment, the first input terminal of the operational amplifier IC is connected to the first voltage divider circuit 10, the second input terminal is connected to the second voltage divider circuit 20, the signal output terminal is connected to the anti-backflow circuit 40, and the power supply terminal is connected to the positive electrode of the solar photovoltaic panel. The operational amplifier IC obtains a first voltage signal input by the first voltage dividing circuit 10 from a first input end, obtains a second voltage signal input by the second voltage dividing circuit 20 from a second input end, compares the first voltage signal with the second voltage signal, if the first voltage signal is greater than the second voltage signal, it indicates that the voltage of the solar photovoltaic panel is greater than the voltage of the battery BAT, and the signal output end of the operational amplifier IC outputs a high level signal to the anti-backflow circuit 40; if the first voltage signal is not greater than the second voltage signal, it indicates that the voltage of the solar photovoltaic panel is not greater than the voltage of the storage battery BAT, and the signal output end of the operational amplifier IC outputs a low-level signal to the backflow prevention circuit 40 to control the backflow prevention circuit 40 to perform backflow prevention protection on the storage battery BAT, so that the reliability of backflow prevention protection on the storage battery BAT is improved.
In one embodiment, as shown in fig. 1, the logic determining circuit 30 further includes a voltage stabilizing resistor R31 and a voltage stabilizing capacitor C; the first end of the voltage stabilizing resistor R31 is connected with the anode of the solar photovoltaic panel, and the second end is connected with the power supply end of the operational amplifier IC and the first end of the voltage stabilizing capacitor C; the second end of the voltage-stabilizing capacitor C is connected with the grounding end.
In the embodiment, a first end of the voltage stabilizing resistor R31 is connected with the anode of the solar photovoltaic panel, and a second end is connected with the power supply end of the operational amplifier IC and the first end of the voltage stabilizing capacitor C; and the second end of the voltage-stabilizing capacitor C is connected with the grounding end and is used for providing stable power supply voltage for the operational amplifier IC and improving the stability of the operational amplifier IC in the working process.
In one embodiment, as shown in fig. 1, the backflow prevention circuit 40 includes a control circuit 41 and a protection circuit 42; a control circuit 41 connected to the logic judgment circuit 30 and the protection circuit 42; and the protection circuit 42 is connected with the solar photovoltaic panel, the anode and the storage battery BAT.
In this embodiment, the control circuit 41 is connected to the logic determination circuit 30 and the protection circuit 42, and is configured to control the protection circuit 42 to perform anti-backflow protection on the battery BAT according to the anti-backflow control signal input by the logic determination circuit 30; and the protection circuit 42 is connected with the solar photovoltaic panel, the anode and the storage battery BAT and used for performing backflow prevention protection on the storage battery BAT, replacing the existing reliability that the schottky diode is directly adopted to perform backflow prevention protection on the storage battery BAT and perform backflow prevention protection on the storage battery BAT.
In one embodiment, as shown in fig. 1, the control circuit 41 includes a first driving resistor R41 and a first transistor Q1; a first end of the first driving resistor R41 is connected to the logic judgment circuit 30, and a second end is connected to a first end of the first transistor Q1; the second terminal of the first transistor Q1 is connected to the protection circuit 42, and the third terminal is connected to the ground terminal.
The first transistor Q1 may be a triode or an N-type MOS transistor. Preferably, the first transistor Q1 reduces circuit cost for the triode.
As an example, the second terminal of the first driving resistor R41 is connected to the base of the first transistor Q1; the first transistor Q1 has a collector connected to the protection circuit 42 and an emitter connected to ground.
As another example, the second terminal of the first driving resistor R41 is connected to the gate of the first transistor Q1; the source of the first transistor Q1 is connected to the protection circuit 42, and the drain is connected to ground.
In the present embodiment, a first terminal of the first driving resistor R41 is connected to the logic determining circuit 30, and a second terminal thereof is connected to a first terminal of the first transistor Q1 for driving the first transistor Q1; the second end of the first transistor Q1 is connected with the protection circuit 42, the third end is connected with the ground terminal, when the backflow prevention control signal output by the logic judgment circuit 30 is a high level signal, the first driving resistor R41 drives the first transistor Q1 to be conducted, the protection circuit 42 is conducted, and the solar photovoltaic panel charges the battery BAT. When the anti-backflow control signal output by the logic judgment circuit 30 is a low level signal, the first driving resistor R41 drives the first transistor Q1 to be turned off, the protection circuit 42 is not turned on, the protection circuit 42 performs anti-backflow protection on the storage battery BAT, the reliability of the anti-backflow protection on the storage battery BAT is improved, and the circuit cost is reduced.
In one embodiment, as shown in fig. 1, the protection circuit 42 includes a second transistor Q2 and a second driving resistor R42; a first end of the second transistor Q2 is connected with the control circuit 41 and a first end of the second driving resistor R42, a second end is connected with the anode of the solar photovoltaic panel, and a third end is connected with the battery BAT; a second terminal of the second driving resistor R42 is connected to the battery BAT.
In this embodiment, a first terminal of the second transistor Q2 is connected to the control circuit 41 and a first terminal of the second driving resistor R42, a second terminal is connected to the positive electrode of the solar photovoltaic panel, and a third terminal is connected to the battery BAT; a second terminal of the second driving resistor R42 is connected to the battery BAT. When the backflow prevention control signal output by the logic judgment circuit 30 is a high level signal, the control circuit 41 is turned on, at this time, the first end of the second transistor Q2 is at a low level, the second transistor Q2 is turned on, and the solar photovoltaic panel charges the battery BAT. When the reverse flow prevention control signal output by the logic judgment circuit 30 is a low level signal, the control circuit 41 is not turned on, and the first end of the second transistor Q2 is connected with the positive electrode of the battery BAT, at this time, the second transistor Q2 is turned off, the second transistor Q2 performs reverse flow prevention protection on the battery BAT, the reliability of reverse flow prevention protection on the battery BAT is improved, and the circuit cost is reduced.
In one embodiment, as shown in fig. 1, the second transistor Q2 is a field effect transistor.
Wherein, the field effect transistor can be a MOS transistor. Such as a P-type MOS transistor.
In this embodiment, since the MOS transistor includes the body diode, when the MOS transistor is turned on, the solar photovoltaic panel directly charges the battery BAT; when the MOS tube is cut off, the body diode storage battery BAT carries out reverse protection, the current of the storage battery BAT is prevented from flowing back to the solar photovoltaic panel, and backflow prevention protection of the storage battery BAT is achieved.
This embodiment provides a solar charging prevents flowing backward system, includes solar photovoltaic board and battery BAT, still includes above-mentioned solar charging prevents flowing backward circuit 40 for prevent flowing backward the protection to battery BAT, improve the reliability of preventing flowing backward the protection in-process.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A solar charging anti-backflow circuit is connected with a solar photovoltaic panel and a storage battery and is characterized by comprising a first voltage division circuit, a second voltage division circuit, a logic judgment circuit and an anti-backflow circuit;
the first voltage division circuit is connected with the solar photovoltaic panel and the logic judgment circuit and is used for outputting a first voltage signal to the logic judgment circuit;
the second voltage division circuit is connected with the storage battery, the logic judgment circuit and the backflow prevention circuit and is used for outputting a second voltage signal to the logic judgment circuit;
the logic judgment circuit is used for acquiring a first voltage signal and a second voltage signal and generating a backflow prevention control signal;
the backflow prevention circuit is connected with the solar photovoltaic panel, the logic judgment circuit and the storage battery and used for acquiring the backflow prevention control signal and performing backflow prevention protection on the solar photovoltaic panel.
2. The solar charging anti-backflow circuit of claim 1 wherein the first voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor connected in series; the first voltage-dividing resistor and the second voltage-dividing resistor are respectively connected with the anode and the cathode of the solar photovoltaic panel;
and a connection node between the first voltage-dividing resistor and the second voltage-dividing resistor is connected with a first input end of the logic judgment circuit.
3. The solar charging anti-backflow circuit of claim 1 wherein the second voltage dividing circuit comprises a third voltage dividing resistor and a fourth voltage dividing resistor connected in series; the third voltage dividing resistor and the fourth voltage dividing resistor are respectively connected with the anode and the cathode of the storage battery;
and a connection node between the third voltage dividing resistor and the fourth voltage dividing resistor is connected with a second input end of the logic judgment circuit.
4. The solar charging anti-backflow circuit of claim 1 wherein the logic determination circuit comprises an operational amplifier;
the first input end of the operational amplifier is connected with the first voltage division circuit, the second input end of the operational amplifier is connected with the second voltage division circuit, the signal output end of the operational amplifier is connected with the backflow prevention circuit, and the power supply end of the operational amplifier is connected with the anode of the solar photovoltaic panel.
5. The solar charging anti-backflow circuit of claim 4 wherein the logic determination circuit further comprises a voltage stabilizing resistor and a voltage stabilizing capacitor;
the first end of the voltage stabilizing resistor is connected with the anode of the solar photovoltaic panel, and the second end of the voltage stabilizing resistor is connected with the power supply end of the operational amplifier and the first end of the voltage stabilizing capacitor;
and the second end of the voltage stabilizing capacitor is connected with the grounding end.
6. The solar charging anti-backflow circuit of claim 1 wherein the anti-backflow circuit comprises a control circuit and a protection circuit;
the control circuit is connected with the logic judgment circuit and the protection circuit;
the protection circuit is connected with the solar photovoltaic panel, the positive electrode and the storage battery.
7. The solar charging anti-backflow circuit of claim 6 wherein the control circuit comprises a first driving resistor and a first transistor;
the first end of the first driving resistor is connected with the logic judgment circuit, and the second end of the first driving resistor is connected with the first end of the first transistor;
and the second end of the first transistor is connected with the protection circuit, and the third end of the first transistor is connected with a grounding end.
8. The solar charging anti-backflow circuit of claim 6 wherein the protection circuit comprises a second transistor and a second driving resistor;
the first end of the second transistor is connected with the control circuit and the first end of the second driving resistor, the second end of the second transistor is connected with the anode of the solar photovoltaic panel, and the third end of the second transistor is connected with the storage battery;
and the second end of the second driving resistor is connected with the storage battery.
9. The solar charging anti-backflow circuit of claim 8 wherein the second transistor is a field effect transistor.
10. A solar charging anti-backflow system comprises a solar photovoltaic panel and a storage battery, and is characterized by further comprising the solar charging anti-backflow circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120538431.9U CN214380236U (en) | 2021-03-15 | 2021-03-15 | Solar charging anti-backflow circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120538431.9U CN214380236U (en) | 2021-03-15 | 2021-03-15 | Solar charging anti-backflow circuit and system |
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| CN214380236U true CN214380236U (en) | 2021-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115509287A (en) * | 2022-09-28 | 2022-12-23 | 安徽省锐凌计量器制造有限公司 | Adjusting circuit, pressure transmitter, adjusting chip and pressure transmitting chip |
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2021
- 2021-03-15 CN CN202120538431.9U patent/CN214380236U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115509287A (en) * | 2022-09-28 | 2022-12-23 | 安徽省锐凌计量器制造有限公司 | Adjusting circuit, pressure transmitter, adjusting chip and pressure transmitting chip |
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