KR102474949B1 - Micro Inverter with heat sink and Photovoltaic Module Array Integrated Micro Inverter for Photovoltaic Power Generation - Google Patents

Abstract

The present invention is manufactured in a small size in order to minimize the change in output due to shade, etc., and integrally mounted on the solar panel, so that the solar panel can be individually controlled, the case formed in the form of a lower plate; a case cover configured to cover the lower plate of the case and having a heat sink formed of radiating fins formed on a surface thereof; It provides a micro-inverter for photovoltaic power generation having a heat sink, characterized in that it is configured to include;

Description

Micro inverter for photovoltaic power generation with heat sink and micro inverter integrated solar cell panel array for photovoltaic power generation

The present invention relates to a micro-inverter for photovoltaic power generation having a heat sink and a micro-inverter-integrated solar cell panel array for photovoltaic power generation, and more particularly, to a micro-inverter integrated solar cell panel array that effectively dissipates heat inside the micro-inverter to the outside, and individual solar cells A micro-inverter for photovoltaic power generation and a micro-inverter for photovoltaic power generation having a heat sink composed of solar cell panels integrally formed with a small-sized micro-inverter that performs Maximum Power Point Tracking (MPPT) for each panel. It relates to an inverter-integrated solar cell panel array.

Photovoltaic (PV) is a system that converts sunlight into electrical energy. Since there is no mechanical or chemical action in the energy conversion process, the system structure is simple, so maintenance is simple, and the life span is about 20 to 30 years, and it is environmentally friendly. to be.

In addition, it is in the spotlight in the field of new and renewable energy because it can be applied to a variety of power generation scales, from small capacity of several kilowatts to large-capacity systems ranging from hundreds of kilowatts.

In order to transmit the power generated by solar power generation to the system, a power converter capable of converting direct current into alternating current and following the maximum power operating voltage of the solar panel is required. The power converter may be composed of a direct current (DC)-direct current (DC) converter at the front stage and a direct current (DC)-alternating current (AC) inverter at the rear stage.

Existing photovoltaic power generation systems link several solar panels to one power regulator to reduce manufacturing costs. have.

Accordingly, recently, a new small-sized inverter method in which one inverter is installed per solar cell module has been applied. In the solar power generation inverter market, a newly emerging product centering on the US market is the microinverter. Micro-inverter converts direct current to alternating current on a module-by-module basis by installing individual inverters in individual solar cell panels (or individual solar cell modules) rather than a centralized method that converts electricity collected from the entire solar cell panel array from DC to AC. It is a distributed system that

As an improvement over conventional inverters, micro-inverters can convert more energy per solar cell module by using a dedicated DC-DC converter for each module.

In addition, recently, building integrated photovoltaic (BIPV) has been attracting attention, but the building integrated photovoltaic power generation system has a problem in that partial shading occurs.

In addition, when a thermal runaway phenomenon occurs due to heat generated inside the inverter, the drive of the inverter is stopped and power generation cannot be performed.

Republic of Korea Patent No. 10-1993807 (2019.06.21.)

The present invention is to solve the problems of the prior art described above, and each module has a maximum power point tracking (MPPT) control function so that problems such as partial shade and device aging can be improved, and the inside of the inverter To provide a micro-inverter for photovoltaic power generation with a heat sink that can prevent the drive stop of the inverter due to thermal runaway in advance by effectively dissipating the heat of the sun and a micro-inverter integrated solar cell panel array for photovoltaic power generation Make it a problem you want to solve.

In order to achieve the above object, one embodiment of the present invention, the case lower plate formed in the form of a plate; a case cover configured to cover the lower plate of the case and having a heat sink formed of radiating fins formed on a surface thereof; It provides a micro-inverter for photovoltaic power generation having a heat sink, characterized in that it is configured to include;

The substrate may include a first conductor connected in parallel with the first solar cell module; a second conductor connected in parallel with the second solar cell module; a first switch connected in parallel with the first solar cell module and the first conductor; a second switch connected in parallel with the second solar cell module and the second conductor; a shuffling inductor connected between the first conductor and the second conductor and the first switch and the second switch; a boost inductor connected to the first solar cell module, the first conductor, and the first switch; a third switch connected to the boost inductor and connected to the second solar cell module, the second conductor, and the second switch; and an MPPT controller controlling an operation to follow a maximum power point based on voltages of the first solar cell module and the second solar cell module, respectively, wherein the first switch, the second switch and the second switch are controlled by the MPPT controller. It is characterized in that the third switch is configured to operate and perform MPPT control.

In order to achieve the above object, another embodiment of the present invention, a micro inverter for photovoltaic power generation in which a heat sink made of heat radiation fins is formed on a surface exposed to the outside; and one or more solar cell panels integrally formed with the micro-inverter, wherein the solar cell panels are connected in parallel by the micro-inverters for photovoltaic power generation. to provide.

The solar cell panel may include a pair of first and second solar cell modules.

The micro-inverter includes a case lower plate formed in a plate shape; a case cover configured to cover the lower plate of the case and having the heat sink formed thereon; and a substrate installed on the lower plate of the case, wherein the substrate includes: a first conductor connected in parallel with the first solar cell module; a second conductor connected in parallel with the second solar cell module; a first switch connected in parallel with the first solar cell module and the first conductor; a second switch connected in parallel with the second solar cell module and the second conductor; a shuffling inductor connected between the first conductor and the second conductor and the first switch and the second switch; a boost inductor connected to the first solar cell module, the first conductor, and the first switch; a third switch connected to the boost inductor and connected to the second solar cell module, the second conductor, and the second switch; and an MPPT controller controlling an operation to follow a maximum power point based on voltages of the first solar cell module and the second solar cell module, respectively, wherein the first switch, the second switch and the second switch are controlled by the MPPT controller. The third switch may be operated to perform MPPT control.

The MPPT control unit may include: an MPPT unit tracking a maximum power point based on voltages of the first solar cell module and the second solar cell module; and a voltage adjusting unit for adjusting the output voltage of the MPPT unit.

The micro-inverter may be configured so that the first switch and the second switch are operated based on the output voltage of the MPPT unit, and the third switch is operated based on the output voltage of the voltage adjusting unit.

In addition, the micro-inverter for photovoltaic power generation according to the present invention includes a DC voltage element connected in parallel with the third switch; and a rectifying element connected between the third switch and the DC voltage element.

The micro-inverter is integrally formed with the solar cell panel and adjusts the current deviation of the first and second solar cell modules to differential power to follow the maximum power point of each of the first and second solar cell modules. It may be configured to convert the power generated by the solar cell panel into AC power and output the converted power.

A micro-inverter for photovoltaic power generation having a heat sink and a micro-inverter integrated solar cell panel array for photovoltaic power generation according to the present invention effectively dissipates heat inside the inverter, thereby preventing the drive stop of the inverter due to thermal runaway in advance. It provides an effect that allows you to do it.

In addition, the micro-inverter for photovoltaic power generation having a heat sink and the micro-inverter integrated solar cell panel array for photovoltaic power generation according to the present invention are connected in parallel through the micro-inverter for photovoltaic power generation, Solar cell panels whose power generation efficiency is reduced due to shading do not affect the power generation efficiency of the entire solar cell panel array, so that when some solar cell panels are not irradiated with sunlight due to shading, etc., the decrease in power generation efficiency is minimized. provide effect.

In addition, the micro-inverter for photovoltaic power generation and micro-inverter-integrated solar cell panel array for photovoltaic power generation having a heat sink according to the present invention have a power conversion efficiency for the total power of the solar cell module. In addition, since the power conversion efficiency is affected only by the power difference of the maximum power point between the solar cell modules, the conversion efficiency of the entire system is finally increased.

1 is a front perspective view (a) and a rear perspective view (b) of a micro-inverter integrated solar cell panel array 1 for photovoltaic power generation according to an embodiment of the present invention.
2 is a perspective view of a micro inverter for photovoltaic power generation according to an embodiment of the present invention;
3 is an exploded perspective view of a micro inverter for photovoltaic power generation according to an embodiment of the present invention;
4 is a functional block diagram up to the front end of a converter that performs MPPT control and DC boosting for AC conversion of a micro inverter for photovoltaic power generation according to an embodiment of the present invention.
5 is a circuit diagram up to a front end of a converter performing MPPT control and DC boosting for AC conversion of a micro inverter for photovoltaic power generation according to an embodiment of the present invention.
6 is a planar perspective view of a solar cell panel 20 constituting a micro-inverter integrated solar cell panel array 1 according to an embodiment of the present invention.
7 is a bottom perspective view of the solar cell panel 20 of FIG. 6;

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

Embodiments according to the concept of the present invention can be applied with various changes and can have various forms, so specific embodiments are illustrated in the drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific disclosed form, and it should be understood that the present invention includes all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "comprise" or "having" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features or numbers However, it should be understood that it does not preclude the presence or addition of steps, operations, components, parts, or combinations thereof.

A micro inverter for photovoltaic power generation according to the present invention will be described in detail with reference to the following drawings.

1 is a front perspective view (a) and a rear perspective view (b) of a micro-inverter integrated solar cell panel array 1 for photovoltaic power generation according to an embodiment of the present invention, and FIG. 2 is a heat sink according to an embodiment of the present invention. 3 is an exploded perspective view of a micro-inverter for photovoltaic power generation having a heat sink according to an embodiment of the present invention, FIG. 4 is a heat sink according to an embodiment of the present invention It is a functional block diagram up to the front end of a converter that performs MPPT control of a micro-inverter for photovoltaic power generation and DC step-up for AC conversion.

As shown in FIG. 1, the micro-inverter integrated solar cell panel array 1 includes solar cell panels 20 and a micro-inverter 10 for photovoltaic power generation integrally formed with the solar cell panel, The solar cell panels 20 may be connected in parallel to each other by being connected in parallel to the micro inverters 10 and the bus wire 5.

As described above, as the solar cell panels 20 are connected in parallel through the bus wire 5, the specific solar cell panel 20 constituting the solar cell panel array 1 emits sunlight as a shade or the like. Even when not irradiated, the effect on the power generation efficiency of the entire solar cell panel array 1 is minimized. In general, when the solar cell panels 20 are connected in series, the output of the entire solar cell panel array 1 is limited to power generated by the solar cell panel 20 to which sunlight is not irradiated due to shading, or Compared to the case where the driving is stopped, when the solar cell panels 20 are connected in parallel, problems that occur when the solar cell panels 20 are connected in series do not occur.

In addition, the solar cell panels 20 include a pair of first and second solar cell modules 410 and 420, and the micro-inverter 10 is integrally detachable from the solar cell panel 20. formed, the current deviation of the first and second solar cell modules 410 and 420 is adjusted to differential power to track the maximum power point of each of the first and second solar cell modules 410 and 420, and the solar cell It may be configured to convert the power generated by the panel into AC power and output it.

Referring to FIGS. 2 and 3 , a micro-inverter 10 for photovoltaic power generation according to an embodiment of the present invention for performing the above-described maximum power point tracking includes a case lower plate 100 formed in a plate shape; a case cover 200 configured to cover the lower case plate 100 and having a heat sink formed of radiating fins formed on a surface thereof; It is configured to include; a substrate 300 installed on the lower plate 100 of the case.

Referring to FIG. 4 , the substrate 300 includes a first conductor 310 connected in parallel with the first solar cell module 410; a second conductor 320 connected in parallel with the second solar cell module 420; a first switch 330 connected in parallel with the first solar cell module 410 and the first conductor 310; a second switch 340 connected in parallel with the second solar cell module 420 and the second conductor 320; a shuffling inductor 350 connected between the first conductor 310 and the second conductor 320 and the first switch 330 and the second switch 340; a boost inductor 360 connected to the first solar cell module 410, the first conductor 310, and the first switch 330; A third switch 370 connected to the boost inductor 360 and connected to the second solar cell module 420, the second conductor 320 and the second switch 340; and a first solar cell module 410 and an MPPT controller 500 that controls an operation to follow the maximum power point based on the voltage of each of the second solar cell modules 420;

At this time, the first switch 330, the second switch 340, and the third switch 340 may be configured to operate by the MPPT control unit. MPPT (Maximum Power Point Tracking) means tracking the maximum power point, which has recently been widely used in solar power generation.

MPPT can obtain maximum power by appropriately adjusting the load according to external conditions.

In the present invention, MPPT control is performed by the MPPT controller 500, and there is a Perturb & Observe (P&O) method as an MPPT control method. The P&O method is a method in which the output voltage of a solar cell module is periodically increased/decreased and a maximum power operating point is found by comparing a previous output power and a current output power. The P&O method has the advantage that there is no loss of the solar cell because the maximum power point is stable in a situation where solar radiation gradually changes.

In the present invention, as shown in FIG. 4, the substrate 300 includes a first conductor 310 connected in parallel with the first solar cell module 410; a second conductor 320 connected in parallel with the second solar cell module 420; a first switch 330 connected in parallel with the first solar cell module 410 and the first conductor 310; a second switch 340 connected in parallel with the second solar cell module 420 and the second conductor 320; a shuffling inductor 350 connected between the first conductor 310 and the second conductor 320 and the first switch 330 and the second switch 340; a boost inductor 360 connected to the first solar cell module 410, the first conductor 310, and the first switch 330; A third switch 370 connected to the boost inductor 360 and connected to the second solar cell module 420, the second conductor 320, and the second switch 340; may be configured to include.

And a DC voltage element 380 connected in parallel with the third switch 370; and a rectifying element 390 connected between the third switch 370 and the DC voltage element 380.

5 is an exemplary diagram of circuit implementation up to the front end of a converter that performs MPPT control and DC step-up for AC conversion of a micro inverter for photovoltaic power generation according to an embodiment of the present invention. The configuration of the substrate 300 as above is shown. 5 can be implemented.

In the present invention, the substrate 300 operates in a buck mode or a boost mode, and determines the voltage duty ratio of the first solar cell module 410 and the second solar cell module 420 do. At this time, the buck mode or the boost mode of the substrate 300 is determined according to the direction of the inductor current I _shuff of FIG. 5 . For reference, the buck mode operates with an output voltage lower than the input voltage, and the boost mode operates with an output voltage higher than the input voltage.

In the present invention, the sum of the voltages of the first solar cell module 410 and the second solar cell module 420, that is, the sum of the PV1 voltage and the PV2 voltage becomes the input voltage. According to the present invention, each maximum power point can be followed by adjusting the current deviation to differential power. Since the voltage fluctuation in the first solar cell module 410 affects the second solar cell module 420, the first solar cell module 420 is affected. The sum of the voltages of the solar cell module 410 and the second solar cell module 420 becomes the input voltage.

In addition, in the present invention, after sensing the voltage and current values of each of the first solar cell module 410 and the second solar cell module 420, the first solar cell module 410 and the second solar cell module ( 420) Each maximum power point may be calculated, and duty ratios of the first solar cell module 410 and the second solar cell module 420 may be determined through a direct-duty ratio technique. In addition, the command voltage of the entire solar cell panel 20 including the first solar cell module 410 and the second solar cell module 420 may be applied to V _dc .

In addition, in the micro inverter for solar power generation according to the present invention, the MPPT control unit 500 follows the maximum power point based on the voltages of the first solar cell module 410 and the second solar cell module 420 ( 510); and a voltage adjusting unit 520 that adjusts the output voltage of the MPPT unit 510.

At this time, the first switch 330 and the second switch 340 are operated based on the output voltage of the MPPT unit 510, and the third switch 370 is operated based on the output voltage of the voltage adjusting unit 520. It can be configured so that

Here, Vcon, which is the output voltage of the MPPT unit 510, can be expressed as [Equation 1].

For reference, in FIG. 5, V _B is the boost input voltage, I _string is the main string current, Vdc is the DC link, L _S is the inductance of the shuffling inductor 350, and L _B is the inductance of the boost inductor 360. do.

Since the substrate 300 is configured as above, the micro-inverter for photovoltaic power generation according to the present invention handles a smaller amount of power than the conventional photovoltaic inverter that handles all the output from the solar cell module. That is, since the power conversion efficiency of the present invention is affected only by the power difference of the maximum power point between the solar cell modules, not the power conversion efficiency of the total power of the solar cell module, the conversion efficiency of the entire system finally increases.

4 and 5, the DC voltage element 380 or V _DC may be a booster or booster element such as a chopper circuit for boosting DC power to DC 400V or the like before AC conversion.

6 is a plan perspective view of the solar cell panel 20 constituting the micro-inverter integrated solar cell panel array 1 according to an embodiment of the present invention, and FIG. 7 is a bottom perspective view of the solar cell panel 20 of FIG. 6 .

6 and 7, the micro-inverter integrated solar cell panel 20 for photovoltaic power generation according to the present invention includes a micro-inverter 10 for photovoltaic power generation, a pair of solar cell modules 410 and 420, It is installed on the rear surface of the battery panel 20 and includes a support 30 for supporting the solar cell modules 410 and 420 . 6 shows the front side of the solar cell panel 20, and FIG. 7 shows the back side (bottom side) of the solar cell panel 20, the micro inverter 10, and the support 30.

That is, the micro-inverter integrated solar cell panel 20 for photovoltaic power generation according to the present invention includes a lower case plate 100 in which the micro-inverter 10 for photovoltaic power generation is formed in a plate shape; a case cover 200 configured to cover the lower case plate 100; a substrate 300 installed on the case lower panel 100; and, as shown in FIG. 4, a first conductor 310 to which the substrate 300 is connected in parallel with the first solar cell module 410; a second conductor 320 connected in parallel with the second solar cell module 420; a first switch 330 connected in parallel with the first solar cell module 410 and the first conductor 310; a second switch 340 connected in parallel with the second solar cell module 420 and the second conductor 320; a shuffling inductor 350 connected between the first conductor 310 and the second conductor 320 and the first switch 330 and the second switch 340; a boost inductor 360 connected to the first solar cell module 410, the first conductor 310, and the first switch 330; a third switch 370 connected to the boost inductor 360 and connected to the second solar cell module 420, the second conductor 320 and the second switch 340; rectifying element 390; A DC voltage element 380 such as a DC transformer that boosts DC to convert it into commercial AC power and then outputs it to a DC-AC converter, and although not shown in the drawing, DC-AC conversion is performed after receiving the boosted DC power It is configured to include an inverter circuit that outputs commercial AC power such as 220V-60Hz by performing. At this time, the first switch 330, the second switch 340, and the third switch 340 may be configured to operate by the MPPT control unit.

The micro-inverter 10 of the above configuration may be configured to further include a short-range communication unit 253 (see FIG. 1) such as Wi-Fi or Bluetooth and an AC output port 255. In the case of FIGS. 6 and 7 , it is illustrated that a Wi-Fi communication module having a Wi-Fi antenna is configured as a short-range communication unit 253 . Due to the configuration of the short-range communication unit 253 described above, the micro-inverter 10 provides an identifier for identifying the solar cell panel 20 and a failure or failure when a failure or failure such as shading occurs in the solar cell panel 20. The type information is transmitted to an external management center or administrator's computer, an alarm device, etc. so that the solar cell panel 20 with a failure or failure can be easily identified and taken. In addition, the solar cell panel may be configured to be directly connected to a power system of commercial power by being configured as a commercial power plug of the AC output port 255 so that it can be connected to a power socket.

Referring again to FIG. 2 , the case cover 200 has a heat sink 203 formed of radiating fins 201 formed on the surface for dissipating heat generated inside to the outside. In addition, a heat dissipation paint layer 210 may be formed on the surface of the heat sink 203 and the lower surface of the case to further increase the surface area of the heat sink 203 and improve heat dissipation efficiency.

The heat-dissipating paint layer 210 includes the paint 211, self-assembled particles 220, and heat-dissipating particles 230.

The paint 211 may be a paint having characteristics such as moisture resistance, heat resistance, flame retardancy, fire resistance, and insulation, in which an organic binder, lacquer-based resin, and diluent are generally used to prevent corrosion.

The self-assembled particles 220 are magnetic powder grown aligned in one direction by a magnetic field, impression graphite powder, or tin, indium, bismuth, silver, copper, and the like having high thermal conductivity self-assembled by heating or pressing. It may be composed of self-assembled metal particles including at least one material selected from the group consisting of alloys. An oxide film is formed on the surface of the self-assembled metal to maintain a uniformly dispersed state in the paint, and after applying the paint 211 in which the self-assembled particles 230 and the heat dissipating particles 230 are mixed, 120 ° C. When it is thermally ironed at a temperature of 250° C., protrusions 212 are formed together with the cured paint 211 by self-assembling and growing, thereby significantly widening the surface area, and at the same time, due to its thermal conductivity, the inside of the micro-inverter 10 It performs a heat dissipation function by dissipating heat to the outside.

The self-assembled particles 220 significantly increase the total surface area of the heat dissipating paint layer 210 by forming fine protrusions on the surface of the cover 200 by growing adjacent to each other when a magnetic field is applied, heated, or pressed. The heat dissipation efficiency is significantly improved.

In addition, the heat dissipating particles 230 may include a heat dissipating material such as phyllite, mordenite, or shungit. The heat dissipating materials having the above configuration may form the heat dissipating particles 230 by mixing 5 to 15 parts by weight of mordenite and 10 to 20 parts by weight of pureite with respect to 80 to 120 parts by weight of fillite. At this time, the fillite is composed of a plate-shaped (about 5 μm) particle structure, contains germanium and selenium, and emits a large amount of far-infrared rays, which are radiant energy, and has excellent thermal conductivity. Mordenite is a mineral composed of spherical grains (about 1 to 3 μm) and has an excellent heat absorption function. The sungit is a mineral composed of granular structures in a cylindrical shape (about 20 μm), and emits far-infrared rays, which are radiant energy, by a spherical (ball-shaped) fullerene material in which more than 60 carbon atoms present in the sungit are bonded, It has excellent thermal conductivity. In addition, since fullerene has a property of shielding electromagnetic waves, sungit provides a heat dissipation function and further implements an electromagnetic shielding function. The heat dissipation particles 230 of the above configuration are arranged in the order in which spherical mordenite particles, cylindrical netite particles, spherical mordenite particles, and plate-shaped mordenite particles are connected again on the plate-shaped fillite particles. Minerals having a variety of shapes form a heat dissipation structure. In the structure described above, the plate-shaped fillite particles emit far-infrared rays and absorb heat by the heat generated from the heat source, and transfer the heat generated from the heat source to the spherical mordenite particles by thermal conductivity, and the mordenite particles absorb the transferred heat. Along with heat storage (to provide the effect of increasing radiant energy emission efficiency), far-infrared ray radiation and heat conduction characteristics are transferred to cylindrical sungit particles. Energy is transferred between fullerene particles by a resonance phenomenon in which the hollow structure of fullerene particles having ball-shaped carbon bonds within the columnar netite particles resonates with atomic vibration. This allows for faster energy transfer (heat dissipation). The spherical mordenite particles store the transferred thermal energy again, and finally transfer the energy to the plate-shaped fillite particles at the end with far-infrared radiation and heat conduction characteristics, and secure a wide heat dissipation area again from the plate-shaped fillite particles By radiating far-infrared rays using this, heat is released to the outside through interfacial permeation using the permeability of far-infrared rays (radiant energy), rather than flow by interfacial contact with existing air. That is, the surface area is remarkably increased by the protrusion structure formed by the self-assembled particles 220 of the heat-dissipating paint layer 210 of the present invention, and the self-assembled particles 220 and the heat-dissipating particles formed inside the paint 211 By rapidly dissipating the heat to the outside in step 230, the heat inside the micro-inverter 10 is efficiently discharged to the outside.

In addition, in the present invention, the lower case plate 100 includes an extension fitting part 110 extending outward from the lower case plate 100; And a hinge coupling portion 120 hinged to the extension fitting portion 110 and rotatably installed, wherein the extension fitting portion 110 is fitted between the solar cell panel 20 and one side of the support 30 And, the hinge coupling portion 120 may be configured to be bolted on the other side of the support 30 by rotating it.

As described above, in the solar cell panel array of the present invention, the micro inverter 10 is integrally mounted on each solar cell panel 20 and connected in parallel to form a solar cell panel array. As a result, when solar cell panels are connected in series as in the prior art, the total output is rapidly reduced when shade or failure occurs in some solar cell panels, but in the present invention, shade or failure occurs due to parallel connection. The effect of the solar cell panel on the output of the entire solar cell panel array is minimized, and the output degradation is significantly reduced, so that stable power generation can be performed even when shading or failure occurs in some solar cell panels.

Although the technical idea of the present invention described above has been specifically described in a preferred embodiment, it should be noted that the above embodiment is for explanation and not for limitation. In addition, those of ordinary skill in the technical field of the present invention will be able to understand that various embodiments are possible within the scope of the technical spirit of the present invention. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: solar panel array 5: bus wire
10: Micro inverter for solar power generation
20: solar cell panel
30: support 100: lower case
110: extension fitting part 120: hinge coupling part
200: case cover 201: radiation fin
203: heat sink 210: heat dissipation paint layer
211: paint 220: self-assembled particles
230: heat dissipating particles 253: short-range communication unit
255: AC output port
300: substrate
310: first conductor 320: second conductor
330: first switch 340: second switch
350: shuffling inductor 360: boost inductor
370: third switch 380: DC voltage element
390: rectifying element 410: first solar cell module
420: second solar cell module

Claims (6)

A case lower plate formed in the form of a plate;
a case cover configured to cover the lower plate of the case and having a heat sink formed thereon; and
It is configured to include; a substrate installed on the lower plate of the case,
the substrate,
A first conductor connected in parallel with the first solar cell module;
a second conductor connected in parallel with the second solar cell module;
a first switch connected in parallel with the first solar cell module and the first conductor;
a second switch connected in parallel with the second solar cell module and the second conductor;
a shuffling inductor connected between the first conductor and the second conductor and the first switch and the second switch;
a boost inductor connected to the first solar cell module, the first conductor, and the first switch;
a third switch connected to the boost inductor and connected to the second solar cell module, the second conductor, and the second switch;
An MPPT controller controlling an operation to follow a maximum power point based on voltages of the first solar cell module and the second solar cell module, respectively;
The first switch, the second switch, and the third switch are operated by the MPPT controller to perform MPPT control,
The case cover has a heat sink formed of radiating fins formed on the surface for dissipating heat generated inside to the outside,
A heat dissipation paint layer is formed on the surface of the heat sink and the surface of the lower plate of the case to further increase the surface area and improve heat dissipation efficiency,
The heat-dissipating paint layer is composed of paint, self-assembled particles, and heat-dissipating particles,
The self-assembled particles are composed of self-assembled metal particles including magnetic powder that grows aligned in one direction by a magnetic field,
A micro-inverter for photovoltaic power generation with a heat sink, characterized in that the growth of the self-assembled metal particles forms protrusions together with the paint. delete A micro inverter for photovoltaic power generation in which a heat sink made of heat radiation fins is formed on a surface exposed to the outside; and
One or more solar cell panels integrally formed with the micro-inverter;
The solar cell panels are connected in parallel by the micro inverters for photovoltaic power generation,
The solar panel,
It is configured to include a pair of first and second solar cell modules,
The microinverter,
A case lower plate formed in the form of a plate;
a case cover configured to cover the lower plate of the case and having the heat sink formed thereon; and
Including; a substrate installed on the lower plate of the case,
the substrate,
a first conductor connected in parallel with the first solar cell module;
a second conductor connected in parallel with the second solar cell module;
a first switch connected in parallel with the first solar cell module and the first conductor;
a second switch connected in parallel with the second solar cell module and the second conductor;
a shuffling inductor connected between the first conductor and the second conductor and the first switch and the second switch;
a boost inductor connected to the first solar cell module, the first conductor, and the first switch;
a third switch connected to the boost inductor and connected to the second solar cell module, the second conductor, and the second switch;
An MPPT controller controlling an operation to follow a maximum power point based on voltages of the first solar cell module and the second solar cell module, respectively;
The first switch, the second switch, and the third switch are operated by the MPPT controller to perform MPPT control;
The case cover has a heat sink formed of radiating fins formed on the surface for dissipating heat generated inside to the outside,
A heat dissipation paint layer is formed on the surface of the heat sink and the surface of the lower plate of the case to further increase the surface area and improve heat dissipation efficiency,
The heat-dissipating paint layer is composed of paint, self-assembled particles, and heat-dissipating particles,
The self-assembled particles are composed of self-assembled metal particles including magnetic powder that grows aligned in one direction by a magnetic field,
A micro-inverter integrated solar cell panel array, characterized in that the growth of the self-assembled metal particles forms protrusions together with the paint. delete delete According to claim 3,
The MPPT control unit,
an MPPT unit tracking a maximum power point based on voltages of the first solar cell module and the second solar cell module; and
It is configured to include a; voltage control unit for adjusting the output voltage of the MPPT unit,
The first switch and the second switch are operated based on the output voltage of the MPPT unit,
The third switch is a micro-inverter integrated solar cell panel array, characterized in that configured to operate based on the output voltage of the voltage regulator.

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