CN220754785U - Photovoltaic optimizer and photovoltaic power generation system - Google Patents

Abstract

The application provides a photovoltaic optimizer and a photovoltaic power generation system. The photovoltaic optimizer includes: a shell and a circuit board. The circuit board is positioned in the shell and comprises a diode circuit and a power tracking circuit. The power tracking circuit is used for tracking the power of the photovoltaic module. The circuit board in the photovoltaic optimizer integrates the diode circuit and the power tracking circuit, can replace a circuit of a diode junction box on a photovoltaic module in an original photovoltaic system, ensures the normal operation of the photovoltaic power generation system, saves the cost of cables and wiring terminals, has a simple structure, and is easy to assemble.

Description

Photovoltaic optimizer and photovoltaic power generation system

Technical Field

The embodiment of the application relates to the technical field of photovoltaics, in particular to a photovoltaic optimizer and a photovoltaic power generation system.

Background

In the photovoltaic power generation system, three diode junction boxes connected in series are arranged on a photovoltaic panel, the diode junction box cables are connected with a photovoltaic optimizer cable arranged on a frame of the photovoltaic module, and the photovoltaic optimizer can achieve maximum power tracking and quick turn-off of the photovoltaic module. However, since the distribution position of the diode junction box is far away from the photovoltaic optimizer, the length of the used cable is long, and the photovoltaic power generation system has a complex structure, is not easy to assemble and has high cost.

Disclosure of Invention

The application provides a photovoltaic optimizer and a photovoltaic power generation system, wherein a diode circuit and a power tracking circuit are integrated on a circuit board in the photovoltaic optimizer. Thus, the photovoltaic optimizer can replace a diode junction box arranged on the photovoltaic module to be connected into the photovoltaic power generation system. The photovoltaic optimizer not only can ensure the normal operation of the photovoltaic power generation system, but also can reduce cables and wiring terminals for connecting the photovoltaic optimizer with the diode junction box in the photovoltaic module, and has the advantages of simple structure, easy assembly and lower cost. Correspondingly, the cost of the photovoltaic power generation system is lower.

In a first aspect, there is provided a photovoltaic optimizer comprising: a housing, a circuit board; the circuit board is positioned in the shell and comprises a diode circuit and a power tracking circuit; the diode circuit is used for transmitting electric energy when an electric energy transmission channel in the photovoltaic module fails, and the power tracking circuit is used for tracking the power of the photovoltaic module.

The photovoltaic optimizer provided by the embodiment of the application is integrated with a diode circuit and a power tracking circuit, wherein the diode circuit can comprise a circuit in a diode junction box on a photovoltaic module. The photovoltaic optimizer provided by the embodiment of the application can replace one diode junction box on the photovoltaic module, so that cables and wiring terminals between the photovoltaic optimizer and the replaced diode junction box can be reduced, and the cost is reduced. In addition, the structure of the photovoltaic power generation system can be simplified by reducing one diode junction box, and the assembly is easy.

In one possible implementation, the housing of the photovoltaic optimizer is bonded to the photovoltaic module, and the bonding is used to increase the effective usable area of the photovoltaic module without damaging the surface of the photovoltaic module. In addition, the use of bonding can simplify the installation procedure and facilitate assembly. The step of bonding the photovoltaic optimizer can occur in a production plant of the photovoltaic module, the step of on-site installation of the photovoltaic optimizer can be omitted, the photovoltaic optimizer and the photovoltaic module can be integrally transported together, and the transportation cost is reduced.

With reference to the first aspect, in certain implementations of the first aspect, the photovoltaic optimizer includes a connection pin, the housing includes at least one pin through hole, the at least one pin through hole is located on a first side of the housing, and the first side of the housing is perpendicular to a plane in which the circuit board is located; one end of the connecting pin is connected with the circuit board, and the connecting pin penetrates through at least one pin through hole and extends to the outer side of the shell.

With reference to the first aspect, in certain implementations of the first aspect, the photovoltaic optimizer further includes a pin accommodating cavity fixedly connected with the first side of the housing, and a portion of the connection pin not located in the housing is disposed in the pin accommodating cavity.

The pin holds the chamber and can play waterproof dirt-proof effect to the protection connection pin is located the part that the pin held the intracavity, improves photovoltaic optimizer's security, and in addition, holds the chamber parcel connection pin with the pin, can avoid overhauling and installer mistake touch and arouse the incident.

With reference to the first aspect, in some implementations of the first aspect, the pin accommodating cavity includes at least one female socket through hole, and an opening direction of the at least one female socket through hole faces a plane of a connection surface of the housing, where the connection surface of the housing is used for fixing with the photovoltaic module.

With reference to the first aspect, in certain implementations of the first aspect, the pin accommodating cavity includes a cover portion and a base, and the cover portion covers the base to form the accommodating cavity to accommodate the connection pin.

The structure that combines through lid and base is convenient for hold the chamber with the pin and opens, and when installing the pin holds the chamber, earlier with base mounting on photovoltaic module, the female seat through-hole on the base aligns the pin on the photovoltaic module, then is connected connecting pin and the pin on the photovoltaic module, covers the lid at last and forms and hold the chamber, consequently holds the chamber with the pin and designs into lid and close the structure of base and be favorable to the installation and the debugging of photovoltaic optimizer.

With reference to the first aspect, in certain implementations of the first aspect, the pin-receiving cavity includes a potting compound, the potting compound fills the pin-receiving cavity, and the potting compound contacts at least a portion of the connection pins.

The glue filling can seal the connecting pins in the pin accommodating cavity, so that the connecting pins are isolated, and the aim of waterproof sealing of the connecting pins accommodated in the pin accommodating cavity is fulfilled.

It should be understood that the glue filling in this application does not cover all of the connection pins, and that the connection pins are also partially exposed for connection with the pins of the photovoltaic module.

With reference to the first aspect, in certain implementations of the first aspect, the connection pins include a first connection pin and a second connection pin, and the first connection pin and the second connection pin are disposed on two sides of the through hole.

The positions of the connecting pins correspond to the positions of the pins on the photovoltaic module, so that the reliability of the electric connection between the connecting pins and the photovoltaic module is improved.

With reference to the first aspect, in certain implementations of the first aspect, the second side of the housing includes at least one cable through hole, the second side of the housing being perpendicular to a plane in which the circuit board lies; the photovoltaic optimizer includes a cable that is connected to the circuit board through at least one cable through hole.

Further, the sealing glue can be filled between the cable through hole and the cable, so that the waterproof sealing purpose is achieved for the printed circuit board module accommodated in the shell.

With reference to the first aspect, in certain implementations of the first aspect, the photovoltaic optimizer further includes a thermally conductive insulating film disposed on an inner wall of the housing

The photovoltaic optimizer has the advantages that the creepage distance is increased under the condition that heat dissipation can be guaranteed through the heat conduction insulating layer, and the photovoltaic optimizer can better meet safety regulations.

With reference to the first aspect, in certain implementations of the first aspect, a surface of the housing remote from the photovoltaic panel is provided with heat dissipating teeth.

In this embodiment of the application, set up the heat dissipation tooth on the surface that photovoltaic board was kept away from to the shell, can improve heat radiating area, be favorable to improving the heat dispersion of circuit board.

With reference to the first aspect, in certain implementations of the first aspect, a thermal insulation layer is disposed between the housing and the photovoltaic panel.

Because the photovoltaic module needs to receive the irradiation of sunlight, the surface temperature of the photovoltaic module is higher, and the heat of the photovoltaic module can be prevented from being transferred to the circuit board through the heat insulation layer, so that the heat dissipation of the circuit board is influenced.

In a second aspect, there is provided a photovoltaic power generation system comprising the photovoltaic optimizer of the first aspect and any one of the possible implementations of the first aspect, a photovoltaic module and a diode junction box, the photovoltaic optimizer being bonded to the photovoltaic module; the diode junction box is connected with a cable of the photovoltaic optimizer.

With reference to the second aspect, in certain implementations of the second aspect, the pins on the photovoltaic module are connected to the connection pins of the photovoltaic optimizer through the female socket vias of the photovoltaic optimizer.

The technical effects of the second aspect may be referred to the corresponding descriptions in the first aspect, and are not repeated here.

Drawings

Fig. 1 is a schematic block diagram of a photovoltaic power generation system provided in an embodiment of the present application.

Fig. 2 is a schematic diagram of a photovoltaic optimizer provided in an embodiment of the present application.

Fig. 3 is an exploded view of a photovoltaic optimizer provided in an embodiment of the present application.

Fig. 4 is a schematic diagram of a pin accommodating cavity provided in an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone.

In the embodiment of the present application, prefix words such as "first", "second", "third", "fourth" and "fifth" are used merely to distinguish different description objects, and there is no limitation on the position, sequence, priority, number or content of the described objects. The use of ordinal words and the like in the embodiments of the present application to distinguish between the prefix words describing the object does not impose limitations on the described object, and statements of the described object are to be read in light of the claims or the description of the context of the embodiments and should not be construed as unnecessary limitations due to the use of such prefix words. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "a plurality" is two or more.

Reference in the specification to "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in some embodiments" or the like in various places throughout this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The reference to "equal to" in this application is not strictly equal to, but is within the tolerance of the error. "flush" is not strictly tangential, but is within the tolerance of the error.

In the embodiments of the present application, the same reference numerals denote the same components or the same parts. In the embodiment of the present application, for a plurality of identical components, reference numerals may be given to only one of the components in the drawings. The same reference numerals are used for other identical parts or components. In addition, the dimensions and sizes of the components shown in the drawings are merely exemplary.

The following describes in detail the photovoltaic power generation system provided in the embodiment of the present application with reference to fig. 1.

Fig. 1 is a schematic block diagram of a photovoltaic power generation system provided in an embodiment of the present application.

As shown in fig. 1, a photovoltaic power generation system 1 provided in an embodiment of the present application includes one or more photovoltaic modules 10, one or more photovoltaic optimizers 20, a photovoltaic inverter 30, a transformer 40, a three-phase ac power grid 50, a first dc cable 60, a second dc cable 70, a first ac cable 80, and a second ac cable 90. Wherein one or more photovoltaic modules 10 are connected to the photovoltaic optimizer 20 through a first direct current cable 60, the connection relationship of the photovoltaic modules 10 and the photovoltaic optimizer 20 may be one-to-one connection. One or more photovoltaic optimizers 20 are connected to the photovoltaic inverter 30 through a second DC cable 70. The photovoltaic inverter 30 converts the dc power into ac power, and the ac side of the photovoltaic inverter 30 is connected to the transformer 40 via a first ac cable 80. The transformer 40 is connected to the three-phase ac power grid 50 by a second ac cable 90. Thus, the ac power output from the photovoltaic inverter 30 passes through the transformer 40 and flows into the three-phase ac power grid 50. The respective devices included in the photovoltaic power generation system 1 are described in detail below.

The photovoltaic power generation system is a power generation system which converts solar radiation energy into electric energy by utilizing the photovoltaic effect of semiconductor materials. The photovoltaic power generation system provided by the embodiment of the application can energize the electric vehicle. The electric vehicle includes a pure electric vehicle (pure electric vehicle/battery electric vehicle, pure EV/battery EV), a hybrid electric vehicle (hybrid electric vehicle, HEV), an extended range electric vehicle (range extended electric vehicle, REEV), a plug-in hybrid electric vehicle (plug-in hybrid electric vehicle, PHEV), a new energy vehicle (new energy vehicle, NEV), or the like.

The Photovoltaic module 10 may also be referred to as a Photovoltaic array, comprising a plurality of Photovoltaic (PV) strings. Each photovoltaic string comprises a plurality of photovoltaic panels connected in series. Photovoltaic panels are used to convert light energy into electrical energy. The electrical energy generated by the photovoltaic panel is Direct Current (DC) electricity. The voltage across the string of photovoltaic groups is equal to the sum of the voltages produced by the plurality of photovoltaic panels. The output power of the photovoltaic module may represent the electrical energy output per unit time of the photovoltaic module.

In this application, photovoltaic module 10 includes the photovoltaic board, install at least one diode terminal box on the photovoltaic board, the photovoltaic board is used for gathering sunlight and exporting the electric energy, the diode terminal box is used for transmitting the electric energy of photovoltaic board output when the circuit that is used for transmitting the electric energy in the photovoltaic board breaks down, be reserve electric energy transmission path, the diode terminal box can be installed at the back of photovoltaic board through pin welded mode, specifically, there is convex pin on the back of photovoltaic board, the pin in the diode terminal box welds with the convex pin in photovoltaic board back. Illustratively, the back side of the photovoltaic panel in the photovoltaic module 10 may be mounted with three diode junction boxes.

It should be understood that the number of diode junction boxes in the present application relates to the architecture of the photovoltaic panel, and three diode junction boxes are generally installed on the back of the photovoltaic panel at present, and the relationship between the number of specific diode junction boxes and the architecture of the photovoltaic panel has no influence on the embodiment of the present application, that is, the embodiment of the present application is applicable to the photovoltaic module 10 in which any number of diode junction boxes are installed.

The photovoltaic optimizer 20 may also be referred to as a photovoltaic power optimizer, and may continuously track the maximum power point of each photovoltaic module 10 to increase the power generation of the photovoltaic power generation system 1, and simultaneously has the functions of module-level shutdown, module-level monitoring, and the like, and supports the long-string design to capture the maximum power point.

In one embodiment, the photovoltaic optimizer 20 is mounted on the frame of the photovoltaic module 10 and connected in series with a diode junction box on the photovoltaic module 10 by a cable.

The photovoltaic inverter 30 is used to convert input direct current into alternating current (alternating current, AC) electricity, i.e., DC-AC conversion. The photovoltaic inverter 30 may also be referred to as a DC-AC converter.

The transformer 40 may be used to voltage convert the ac power to adjust the voltage value of the input ac voltage. It should be appreciated that the input and the input of the transformer 40 are both alternating current. The transformer 40 may boost the alternating current output by the one or more photovoltaic inverters 30.

In the photovoltaic power generation system 1, the area of each photovoltaic module 10 is generally fixed, and when the light intensity of the light is unchanged, the larger the included angle between the light irradiated on the photovoltaic module 10 and the plane in which the photovoltaic module 10 is located, that is, the smaller the incident angle of the light irradiated on the photovoltaic module 10, the more electric energy is output by the photovoltaic module 10. When the light vertically irradiates on the photovoltaic module 10, that is, the included angle between the light and the plane where the photovoltaic module 10 is located is 90 degrees, and reaches the maximum value, the power output by the photovoltaic module 10 reaches the maximum value.

When the photovoltaic power generation system 1 includes a plurality of photovoltaic optimizers 20, the photovoltaic power generation system 1 further includes a junction box for junction the direct currents generated by the plurality of photovoltaic modules 10, and inputs the junction-processed output to the photovoltaic inverter 30 after passing through a cut-off switch and lightning protection.

The following describes in detail the photovoltaic optimizer 20 provided in the embodiments of the present application with reference to fig. 2 and 3.

Fig. 2 is a schematic diagram of a photovoltaic optimizer 20 provided in an embodiment of the present application.

As shown in fig. 2, the photovoltaic optimizer 20 includes a power module 210, a connection module 220, and a cable 230. The power module 210 and the connection module 220 are fixed on the back surface of the photovoltaic module 10, the power module 210 is connected with a diode junction box (not shown in fig. 2) on the photovoltaic module through a cable 230, the power module 210 is also connected with the connection module 220, and the contact surface of the power module 210 and the photovoltaic module 10 is perpendicular to the contact surface of the power module 210 and the connection module 220.

In one embodiment, the power module 210 is bonded to the back side of the photovoltaic module 10. Specifically, a gel is disposed between the power module 210 and the back side of the photovoltaic module 10.

For example, the colloid is a gel formed by a gel process. For another example, the gel is a cured gel formed by a curing process.

The bonding is used to improve the effective use area of the photovoltaic module without damaging the surface of the photovoltaic module. In addition, the use of bonding can simplify the installation procedure and facilitate assembly. The step of bonding the photovoltaic optimizer can occur in a production plant of the photovoltaic module, the step of on-site installation of the photovoltaic optimizer can be omitted, the photovoltaic optimizer and the photovoltaic module can be integrally transported together, and the transportation cost is reduced.

Further, a heat insulating layer is disposed between the power module 210 and the back surface of the photovoltaic module, so as to prevent heat emitted by the photovoltaic module from affecting heat dissipation of the power module 210.

In one embodiment, the connection module 220 includes connection pins, and the connection module 220 and the photovoltaic module 10 are electrically connected by soldering the connection pins on the connection module 220 to corresponding pins on the back side of the photovoltaic module 10.

In one embodiment, a connection structure exists between the power module 210 and the connection module 220, for example, the connection structure includes a screw that passes through the housing of the power module 210 and the housing of the connection module 220 to connect the power module 210 and the connection module 220.

In one possible implementation, the connection structure comprises only screws, which are self-locking screws.

In one possible implementation, the connection structure includes nuts in addition to screws, one screw passing through the housing of the power module 210, the housing of the connection module 220, and one nut cooperating with each other to achieve a fixed connection of the power module 210 and the connection module 220.

In this application, the photovoltaic optimizer 20 may implement the function of a diode junction box on the back side of the photovoltaic module 10 in fig. 1 in addition to the function of the photovoltaic optimizer in fig. 1.

In a possible implementation, the power module 210 includes a power tracking circuit, where the power tracking circuit is configured to perform the function of the photovoltaic optimizer in fig. 1, that is, to track the power of the photovoltaic module, and the connection module 220 includes a diode circuit, where the diode circuit is configured to perform the function of a diode junction box, that is, to transmit electric energy when an electric energy transmission path in the photovoltaic module fails. By this solution, the photovoltaic optimizer of fig. 1 can be mechanically combined with a diode junction box to form the photovoltaic optimizer of fig. 2, wherein the connection module 220 of the photovoltaic optimizer of fig. 2 comprises the original diode junction box.

In a possible implementation manner, the power module 210 includes a power tracking circuit and a diode circuit, where the power tracking circuit is used to implement the function of the photovoltaic optimizer in fig. 1, that is, to track power of the photovoltaic module, and the diode circuit is used to implement the function of a diode junction box, that is, to transmit electric energy when an electric energy transmission path in the photovoltaic module fails, and one end of a connection pin in the connection module 220 is connected to the back surface of the photovoltaic module 10, and the other end is connected to the power module 210, and the photovoltaic optimizer will be described in detail below in conjunction with fig. 3.

Fig. 3 is an exploded view of the photovoltaic optimizer 20 provided in an embodiment of the present application. As shown in fig. 3, the power module in the photovoltaic optimizer 20 includes a housing 2101, a circuit board 2102, and the connection module in the photovoltaic optimizer 20 includes connection pins 2201.

Therein, a circuit board receiving cavity is provided in housing 2101 for receiving circuit board 2102.

The housing 2101 comprises at least one pin through hole for extending a connection pin of the connection module through the housing 2101 to the outside of the housing 2101, wherein the at least one pin through hole is located at a first side of the housing 2101, the first side of the housing 2101 being perpendicular to the plane of the circuit board 2102.

The second side of the housing 2101 further comprises at least one cable through hole for connecting the cable to the circuit board through the housing 2101, the second side of the housing being perpendicular to the plane of the circuit board, the second side of the housing also being perpendicular to the first side of the housing.

In one embodiment, the housing 2101 is adhered to the back side of the photovoltaic module by white glue.

Heat dissipating teeth may also be provided on housing 2101 on a surface of the housing remote from the photovoltaic module. The heat dissipation teeth can increase the heat dissipation area of the shell and improve the heat dissipation capacity of the photovoltaic optimizer. It should be understood that the heat dissipating teeth are merely examples of improving heat dissipating capability, and the present application is not limited thereto. For example, the heat dissipation capacity of the photovoltaic optimizer can also be improved by adding a water cooling and micro-fans.

A thermal insulation layer is disposed between the housing 2101 and the photovoltaic module, and heat emitted by the photovoltaic module can be prevented from affecting heat dissipation of the power module 210 by the thermal insulation layer.

The inner cavity of the housing 2101 can be adhered with a layer of heat conducting insulating film, so that the creepage distance is increased, and the photovoltaic optimizer can better meet the safety regulations.

An example of the housing 2101 is shown in fig. 3, where the housing 2101 includes an upper cover 2101a and a lower cover 2101b, the lower cover 2101b is used to fix the photovoltaic optimizer on the photovoltaic module, the upper cover 2101 is used to cover the lower cover 2101b to form a receiving cavity, the receiving cavity is used to receive the circuit board 2102, the face of the lower cover 2101b close to the photovoltaic module is bonded to the photovoltaic module, the heat dissipation teeth are disposed on the surface of the upper cover 2101a away from the circuit board 2102, and the heat insulation layer is disposed between the surface of the lower cover 2101b away from the circuit board and the back face of the photovoltaic module.

The connection between the upper cover 2101a and the lower cover 2101b in fig. 3 by a screw is merely an example, and the connection between the upper cover 2101a and the lower cover 2101b can also be achieved by a clamping connection, an adhesive connection, or an ultrasonic connection, which is not limited in this application.

The connection interface between the upper cover 2101a and the lower cover 2101b can be sealed, for example, by using a silica gel strip, so that the safety of the photovoltaic optimizer is improved. It should be understood that the use of a silicone strip seal is merely an example, and the present application is not limited to a particular manner of sealing.

In this application, the material of the upper cover 2101a may be metal. The sheet metal forming die can be formed by sheet metal forming and welding, and also can be formed by profile forming and cutting.

In one possible embodiment, the upper cover 2101a is made of aluminum.

It will be appreciated that aluminium is lighter in weight of the same unit volume of metal. Meanwhile, the price of aluminum is low, and the cost can be reduced while the weight of the photovoltaic optimizer is reduced.

Aluminum is only one example of the material of the upper cover 2101 a. For example, the upper cover 2101a may be made of an aluminum alloy. Other metals, such as copper with high thermal conductivity and high strength, are also within the scope of the present application.

It should also be appreciated that the material of the upper cover 2101a may be non-metal, and the non-metal has a thermal conductivity greater than or equal to that of metal, and the material of the upper cover 2101a may include graphite, or may include PC plastic, which is a polycarbonate material, and if the non-metal material is used, the upper cover 2101a may be manufactured by injection molding.

It should be understood that the materials of the upper cover 2101a and the lower cover 2101b may be the same or different in this application, and this application is not limited thereto.

The circuit board 2102 includes a power tracking circuit and a diode circuit, and in particular, the circuit board 2102 includes a circuit board having the power tracking circuit and the diode circuit drawn thereon and at least one device mounted on the circuit board. The power tracking circuit is used for continuously tracking the maximum power point of each photovoltaic module to improve the power generation capacity of the photovoltaic power generation system; the diode circuit is used for realizing the function of transmitting the output electric energy of the photovoltaic module, in particular, the diode circuit can be a standby electric energy transmission path, and particularly, when the electric energy transmission path inside the photovoltaic panel in the photovoltaic module fails, the electric energy output by the photovoltaic panel in the photovoltaic module is transmitted through the diode circuit, and the diode circuit can realize the function of a diode junction box and can comprise a diode, and the diode can be a bypass diode.

It should be understood that the power tracking circuit is used to implement the function of the photovoltaic optimizer in fig. 1, and the diode circuit is used to implement the function of the diode junction box, and the specific circuit structure and circuit hardware design are not described in detail herein.

The connection pin 2201 is used for being connected with a pin on the back of the photovoltaic module to connect a diode circuit in the circuit board 2102 with the photovoltaic module, specifically, one end of the connection pin 2201 is connected with the circuit board 2102, the connection pin 2201 extends to the outer side of the housing 2101 through at least one pin through hole on the housing, and a portion of the connection pin 2201 located on the outer side of the housing 2101 is used for being connected with a pin on the back of the photovoltaic module.

In fig. 3, the connection pins include a first connection pin and a second connection pin, and the first connection pin and the second connection pin are disposed on two sides of the pin through hole, which is only an example, and the number of the connection pins and the positions of the connection pins are not limited in this application, and the number of the connection pins and the positions of the connection pins need to be considered.

In one embodiment, the connection module in the photovoltaic optimizer may further comprise: pin receiving cavities 2202. The pin receiving cavity 2202 is fixedly coupled to a first side of the housing 2201, and an interior of the pin receiving cavity 2202 includes a cavity for receiving a portion of the connection pin 2201 that is not located within the housing 2101.

The cable 230 is used for connecting the photovoltaic optimizer and the diode junction box, specifically, one end of the cable 230 is connected with a circuit board in the photovoltaic optimizer, the other end of the cable passes through the pin through hole and is connected with the diode junction box, and one cable corresponds to one diode junction box.

In one embodiment, the outgoing end of the cable 230 is sealed, for example, using a wire clip, to improve the waterproof, dust-proof, and insulating capabilities of the cable, and to better satisfy safety regulations for the photovoltaic optimizer. It should be understood that sealing using a wire clip is merely an example, and the present application is not limited to a specific sealing method.

In one embodiment, the photovoltaic optimizer further includes a first glue fill for filling a gap between the inner wall of the housing 2101 and the circuit board 2102, for example, using a sealed glue fill method. Accordingly, the first glue may seal the circuit board 2102 in the housing 2101, so that the circuit board 2102 is isolated, and the purpose of insulating the circuit board 2102 is achieved, thereby meeting the requirements of safety regulations. In addition, the first glue-pouring can also transfer the heat generated by the devices on the circuit board to the housing 2101, and then to the surrounding air outside the housing 2101, so that the heat dissipation capacity of the photovoltaic optimizer 20 is enhanced.

In this embodiment, the housing 2101 further includes a glue-pouring aperture and a glue-pouring aperture plug. The gap between the inner wall of the housing 2101 and the circuit board 2102 is filled with the first potting through the potting hole, and after the first potting is formed, the potting hole is plugged with the potting hole so that the accommodation chamber in the housing 2101 is sealed.

The photovoltaic optimizer may also include a second glue fill for filling the gap between the inner wall of the pin receiving cavity and the connection pins 2201, for example, using an open glue fill method. Correspondingly, the second glue filling can seal the connecting pin 2201 in the pin accommodating cavity, so that the connecting pin 2201 is isolated, the purpose of insulating the connecting pin 2201 is achieved, the protection level of the whole machine reaches IPX8, and the requirement of safety regulation is met.

It should be noted that the second glue-filled layer does not cover the connection pins 2201 entirely, and the connection pins 2201 are also partially exposed to connect with the pins of the photovoltaic module.

Likewise, the pin receiving cavity may also include a glue filling hole and a glue filling hole plug, which are not described herein.

The function of the diode junction box is integrated in the photovoltaic optimizer, the diode junction box on the original photovoltaic module can be replaced, the cost of cables and wiring terminals is saved, and the structure is simplified.

One implementation of the pin receiving cavity is described below in connection with fig. 4.

As shown in fig. 4, fig. 4 is a schematic view of a pin accommodating cavity provided in an embodiment of the present application, where the pin accommodating cavity includes at least one female socket through hole, the at least one female socket through hole is used for making a connection pin 2201 pass through the pin accommodating cavity to be welded with a pin on the back of the photovoltaic module, and an opening direction of the at least one female socket through hole faces a plane where a connection surface of the housing for fixing with the photovoltaic module is located.

The surface of the pin receiving cavity connected to the housing in fig. 3 further includes at least one access through hole corresponding to the pin through hole in the housing for allowing a portion of the connection pin not located in the housing to extend into the pin receiving cavity.

The pin receiving cavity may be connected to the housing of the photovoltaic optimizer by a connection structure.

In a possible implementation manner, the connection structure only comprises a screw, the screw is a self-locking screw, the pin accommodating cavity can be fastened on the shell through the screw, and the screw penetrates through the shell and the pin accommodating cavity to realize connection of the pin accommodating cavity and the shell.

In one possible implementation, the connection structure includes nuts in addition to screws, and one screw passes through the housing, the pin accommodating cavity and one nut to be mutually matched, so that the pin accommodating cavity is connected with the housing.

Furthermore, the connecting interface between the shell and the pin accommodating cavity is sealed, for example, a silica gel strip is used for sealing, so that the safety of the photovoltaic optimizer is improved, and the photovoltaic optimizer better meets the safety regulations. It should be understood that the use of a silicone strip seal is merely an example, and the present application is not limited to a particular manner of sealing.

The pin accommodating cavity can further comprise a cover part and a base, the cover part covers the base to form an accommodating cavity for accommodating the connecting pins, the base is fixed on the photovoltaic module, and at least one base through hole is formed in the connecting surface of the base and the photovoltaic module. Through the structure of this kind of lid, can be earlier with the base according to the position of the last pin of photovoltaic module and the position fixed base of the part that connecting pin stretches out the shell, then with connecting pin and photovoltaic module's pin welding, at last cover lid to the installation pin holds the chamber of being convenient for.

Fig. 5 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present application. The photovoltaic power generation system comprises a photovoltaic module 10, a photovoltaic optimizer 20 and a diode junction box 30, wherein the photovoltaic module 10 comprises a photovoltaic panel 101 and a frame 102. The photovoltaic panel 101 is used for absorbing sunlight to generate electric energy, wherein the front surface is a mirror surface; the frame 102 is used for fixing and protecting the photovoltaic panel 101; the photovoltaic optimizer 20 is adhered to the back of the photovoltaic panel 101, and the photovoltaic optimizer 20 is connected with the diode junction box 30 through a cable; the diode junction box 30 is located on the back of the photovoltaic panel 101, and is used for controlling the direction of the output current of the photovoltaic panel 101 and playing a role in rectification.

The number of diode junction boxes 30 in fig. 5 is 2, which is merely an example, and the present application is not limited thereto.

The structure of the photovoltaic optimizer 20 is described with reference to fig. 2 to 4, and is not described herein, wherein pins on the back surface of the photovoltaic panel 101 are connected to connection pins of the photovoltaic optimizer through the female socket through holes of the photovoltaic optimizer 20.

After the photovoltaic optimizer is produced and assembled in an electronic manufacturing factory, the photovoltaic module factory can install the photovoltaic optimizer only according to the process consistent with the diode junction box.

Specifically, when the electronic manufacturing factory is assembled, firstly, the photovoltaic optimizer power module is assembled (comprising the welding of the connecting pins and the circuit board), then the wiring module penetrates through the connecting pins, then the wiring module is connected and fastened with the power module shell by using screws, sealing, waterproofing and processing are carried out on the interface of the connection of the wiring module and the power module shell, and finally, sealing and glue filling are carried out in the power module cavity.

When the photovoltaic module factory is installed, the lower cover of the photovoltaic optimizer is glued (structural glue) firstly, then the through holes of the female seat on the wiring module are aligned with pins on the photovoltaic panel, and then the photovoltaic optimizer is bonded with the photovoltaic panel. And after the bonding is finished, welding the pins of the photovoltaic panel and the connecting pins of the photovoltaic optimizer, and filling glue into the internal cavity of the junction line module after the welding is finished.

In the application, the photovoltaic optimizer and the photovoltaic panel are connected to complete assembly in the production link of the photovoltaic module factory, the photovoltaic panel is only required to be installed on site in the installation site, the step of installing the photovoltaic optimizer on site can be omitted, and the installation flow of photovoltaic equipment is simplified. The photovoltaic optimizer can be transported together with the photovoltaic module, so that the transportation cost is saved.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. A photovoltaic optimizer, characterized in that the photovoltaic optimizer comprises: a housing, a circuit board;

the circuit board is positioned in the shell and comprises a diode circuit and a power tracking circuit;

the diode circuit is used for transmitting electric energy when an electric energy transmission channel in the photovoltaic module fails, and the power tracking circuit is used for carrying out power tracking on the photovoltaic module.

2. The photovoltaic optimizer of claim 1, wherein the photovoltaic optimizer comprises a connection pin, wherein the housing comprises at least one pin through hole, wherein the at least one pin through hole is located on a first side of the housing, wherein the first side of the housing is perpendicular to a plane in which the circuit board is located;

one end of the connecting pin is connected with the circuit board, and the connecting pin penetrates through the at least one pin through hole and extends to the outer side of the shell.

3. The photovoltaic optimizer of claim 2, wherein,

the photovoltaic optimizer further comprises a pin accommodating cavity fixedly connected with the first side face of the shell, and the portion, which is not located in the shell, of the connecting pin is arranged in the pin accommodating cavity.

4. The photovoltaic optimizer of claim 3, wherein,

the pin accommodating cavity comprises at least one female seat through hole, the opening direction of the at least one female seat through hole faces to the plane where the connecting surface of the shell is located, and the connecting surface of the shell is used for being fixed with the photovoltaic module.

5. The photovoltaic optimizer of claim 3 or 4, wherein the pin receiving cavity comprises a cover portion and a base, the cover portion covering the base to form a receiving cavity to receive the connection pin.

6. The photovoltaic optimizer of claim 3 or 4, wherein the pin receiving cavity comprises a potting compound, wherein the potting compound fills the pin receiving cavity and is in contact with at least a portion of the connection pins.

7. The photovoltaic optimizer of any one of claims 2-4, wherein the connection pins include a first connection pin and a second connection pin, the first connection pin and the second connection pin being disposed on opposite sides of a through hole.

8. The photovoltaic optimizer of any one of claims 1-4,

the second side surface of the shell comprises at least one cable through hole, and the second side surface of the shell is perpendicular to the plane of the circuit board;

the photovoltaic optimizer includes a cable that is connected to the circuit board through the at least one cable through hole.

9. The photovoltaic optimizer of any one of claims 1-4, further comprising a thermally conductive insulating film disposed on an inner wall of the housing.

10. The photovoltaic optimizer of any one of claims 1-4, wherein a surface of the housing remote from the photovoltaic module is provided with heat dissipating teeth.

11. The photovoltaic optimizer of any one of claims 1-4, wherein a thermal insulation layer is disposed between the housing and the photovoltaic module.

12. A photovoltaic power generation system comprising a photovoltaic optimizer of any one of claims 1-11, a photovoltaic module and a diode junction box, the photovoltaic optimizer being bonded to the photovoltaic module, the diode junction box being connected to a cable of the photovoltaic optimizer.

13. The photovoltaic power generation system of claim 12, wherein the pins on the photovoltaic module are connected to the connection pins of the photovoltaic optimizer through the female socket vias of the photovoltaic optimizer.