KR20200040588A - Transformer, power converting apparatus including the transformer, and photovoltaic module including the power converting apparatus - Google Patents

Abstract

The present invention relates to a transformer, a power conversion device including the transformer, and a solar module including the power conversion device. According to one embodiment of the present invention, the transformer comprises: a core having a base and a plurality of protruding members protruding from the base and disposed in an outer wall; a plurality of bobbins surrounding each of the plurality of protruding members and spaced apart from each other; and a winding wound around the plurality of bobbins. Accordingly, processing is facilitated so that a shape can be easily changed.

Description

A transformer, a power conversion device including the transformer, and a solar module including the power conversion device {Transformer, power converting apparatus including the transformer, and photovoltaic module including the power converting apparatus}

The present invention relates to a transformer, a power conversion device including the transformer, and a solar module including the power conversion device, and more specifically, a transformer that is easy to process and can easily change its shape. It relates to a power conversion device comprising, and a solar module having the power conversion device.

The power conversion device is employed for providing an alternating current power supply to a solar module for producing renewable energy, and the like.

In particular, a transformer, a leakage inductor, and the like are used in the converter to convert the DC power produced by the solar module or the like.

On the other hand, when using a general resonant transformer, the winding space of the transformer is divided into upper and lower layers, and an air gap is disposed between the upper and lower layers. However, in this case, since the central core space is fixed, there is a disadvantage that it is not easy to adjust the leakage inductance.

On the other hand, when the transformer and the leakage inductor are respectively mounted on the circuit board, there is a disadvantage of occupying a considerable volume.

Accordingly, in order to miniaturize the power change device attached to the solar module, efforts to miniaturize the size of the transformer and the leaky inductor have been attempted. In particular, research on the integrated transformer that integrates and designs the transformer and the leaky inductor is underway. have.

On the other hand, US 20140313004 discloses the contents of the integrated transformer. However, according to this integrated transformer, it is arranged in the outer wall of the core, the circular inner wall, and the circular second inner wall surrounding the circular inner wall. However, since the inner wall and the second inner wall making the leakage inductance have a circular shape, processing is not easy, and therefore, the leakage inductance cannot be easily adjusted according to the design specification.

An object of the present invention is to provide a transformer that is easy to process and can easily change its shape, a power conversion device including the transformer, and a solar module including the power conversion device.

Another object of the present invention is to provide a transformer capable of easily adjusting a leakage inductance according to design specifications due to easy processing, a power conversion device including the transformer, and a solar module including the power conversion device.

Another object of the present invention is to provide a transformer that can reduce the size of a transformer in a solar module, a power conversion device including the transformer, and a solar module including the power conversion device.

Another object of the present invention is to provide a transformer in which a leakage inductor and a transformer are integrated, a power conversion device including the transformer, and a solar module including the power conversion device.

A transformer according to an embodiment of the present invention for achieving the above object, a power conversion device including the transformer, and a solar module provided with the power conversion device, the base and a plurality of protrusions on the base and disposed in the outer wall It includes a core having a protruding member, a plurality of bobbins surrounding each of the plurality of protruding members, spaced apart from each other, and a winding wound around the plurality of bobbins.

Meanwhile, the micro-inverter may include a converter that converts the level of the voltage input from the solar cell module, and an inverter that converts it to AC.

At this time, the transformer in the converter, the core, the core having a plurality of protruding members disposed on the outer wall, projecting on the base, and surrounding the plurality of protruding members, a plurality of bobbins spaced apart from each other, and a plurality of bobbins It includes a winding wound on.

On the other hand, a plurality of bobbins are connected by a connecting member.

Meanwhile, the plurality of protruding members may have a circular, elliptical, or polygonal shape, and the heights of the plurality of protruding members may be the same.

Meanwhile, the base, the outer wall, and the plurality of protruding members in the core may be formed of the same material.

Meanwhile, a first opening and a second opening facing each other are formed on the outer wall of the core, and the first connection member and the second connection member connected to any one of the plurality of bobbins are among the first opening and the second opening. It extends outward through either.

Meanwhile, the winding may include a first winding wound around a first groove formed in a plurality of bobbins, and a second winding wound around a second groove formed in a plurality of bobbins.

Meanwhile, the first winding is electrically connected to the first connecting member, and the second winding is electrically connected to the second connecting member.

On the other hand, the core, spaced apart from the plurality of protruding members, may further include an additional protruding member having a different shape.

Meanwhile, the projecting heights of the additional projecting members are equal to or smaller than the projecting heights of the plurality of projecting members.

On the other hand, the plurality of protruding members has a circular, elliptical, or polygonal shape, and the length of the edge of the additional protruding member is smaller than half of the outer periphery of the plurality of protruding members.

On the other hand, as it goes from the center of the additional projecting member to the side, the gap between the plurality of projecting members and the additional projecting member is greater.

Meanwhile, any one of the plurality of bobbins surrounds one of the plurality of protruding members and an additional protruding member together.

The transformer according to the embodiment of the present invention, a core having a plurality of protruding members protruding on a base, a base, and disposed on an outer wall, a plurality of bobbins surrounding each of the protruding members, and spaced apart from each other , Winding wound on a plurality of bobbins. Accordingly, it is easy to process and the shape can be easily changed.

On the other hand, the present invention can provide a solar module provided with a micro inverter including the transformer and a micro inverter including the transformer.

On the other hand, due to the plurality of protruding members, the leakage inductance can be easily adjusted according to the design specifications.

On the other hand, a plurality of bobbins are connected by a connecting member. Accordingly, a plurality of bobbins can be fixed.

Meanwhile, the plurality of protruding members may have a circular, elliptical, or polygonal shape, and the heights of the plurality of protruding members may be the same. Accordingly, the core can be easily manufactured by molding or the like.

Meanwhile, the base, the outer wall, and the plurality of protruding members in the core may be formed of the same material. Accordingly, the core can be easily manufactured by molding or the like.

Meanwhile, a first opening and a second opening facing each other are formed on the outer wall of the core, and the first connection member and the second connection member connected to any one of the plurality of bobbins are among the first opening and the second opening. It extends outward through either. Accordingly, it is possible to easily mount the transformer on an external circuit board.

Meanwhile, the winding may include a first winding wound around a first groove formed in a plurality of bobbins, and a second winding wound around a second groove formed in a plurality of bobbins. Accordingly, the first winding and the second winding can be separated, respectively.

Meanwhile, the first winding is electrically connected to the first connecting member, and the second winding is electrically connected to the second connecting member. Accordingly, it is possible to easily mount the transformer on an external circuit board.

On the other hand, the core, spaced apart from the plurality of protruding members, may further include an additional protruding member having a different shape. Accordingly, the processing of the additional protruding member is easy, so that the leakage inductance can be easily adjusted according to the design specification.

Meanwhile, the projecting heights of the additional projecting members are equal to or smaller than the projecting heights of the plurality of projecting members. Accordingly, it is possible to easily adjust the leakage inductance according to the height difference between the additional protruding member and the plurality of protruding members.

On the other hand, the plurality of protruding members has a circular, elliptical, or polygonal shape, and the length of the edge of the additional protruding member is smaller than half of the outer periphery of the plurality of protruding members. Accordingly, the processing of the additional protruding member is easy, so that the leakage inductance can be easily adjusted according to the design specification.

On the other hand, as it goes from the center of the additional projecting member to the side, the gap between the plurality of projecting members and the additional projecting member is greater. Thereby, winding of a winding becomes easy.

Meanwhile, any one of the plurality of bobbins surrounds one of the plurality of protruding members and an additional protruding member together. Thereby, winding of a winding becomes easy.

1 is a view showing an example of a solar system including a solar module according to an embodiment of the present invention.
2 is a view showing another example of a solar system including a solar module according to an embodiment of the present invention.
FIG. 3 is a circuit diagram of a junction box inside the solar module of FIG. 1 or 2.
4 to 5 are various examples of the power conversion device of the solar module.
6 is a circuit diagram of a power conversion device in a solar module according to an embodiment of the present invention.
7A to 7B are views referred to for description of the power conversion device of FIG. 6.
8A to 8E are views referred to in the description of the transformer.
9A is a view showing a core in a transformer according to an embodiment of the present invention.
9B is a view showing a bobbin structure in a transformer according to an embodiment of the present invention.
10 is a view showing a transformer according to an embodiment of the present invention.
11A to 11B are views referred to in the description of FIG. 10.
12 is a view showing a core of a transformer according to an embodiment of the present invention.
13A to 13C are views referred to in the description of FIG. 12.
14 is an exploded perspective view of the solar cell module of FIG. 1 or 2.

In this specification, an integrated transformer is proposed, which is easy to process and can easily adjust the leakage inductance according to design specifications.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "modules" and "parts" for components used in the following description are given simply by considering the ease of writing the present specification, and do not give meanings or roles particularly important in themselves. Therefore, the "module" and the "unit" may be used interchangeably.

1 is a view showing an example of a solar system including a solar module according to an embodiment of the present invention.

Referring to the drawings, the solar system 10a according to an embodiment of the present invention may include a solar module 50 and a gateway 80.

The solar module 50 is integral with the solar cell module 100 and the junction box 200 including a power conversion device (500 in FIG. 6) that converts and outputs DC power from the solar cell module to AC power. It can be provided with.

In the drawing, the junction box 200 is shown to be attached to the rear surface of the solar cell module 100, but is not limited thereto. It is also possible that the junction box 200 is provided separately from the solar cell module 100.

Meanwhile, a cable (oln) for supplying the AC power output from the junction box 200 to the grid may be electrically connected to the output terminal of the junction box 200.

Meanwhile, the gateway 80 may be located between the junction box 200 and the grid 90.

On the other hand, the gateway 80, it is possible to detect the alternating current (io) and alternating voltage (vo) output from the solar module 50, flowing through the cable (oln).

Meanwhile, the gateway 80 may output a power factor adjustment signal for power factor adjustment based on the phase difference between the AC current io and the AC voltage vo output from the solar module 50.

To this end, the gateway 80 and the solar module 50 may perform power line communication (PLC communication) or the like using a cable (oln) or the like.

Meanwhile, the power conversion device (500 in FIG. 6) in the solar module 50 may convert and output DC power output from the solar cell module 100 into AC power.

For this, a converter (530 in FIG. 6) and an inverter (540 in FIG. 6) may be provided in the power conversion device (500 in FIG. 6) in the solar module 50.

Meanwhile, the power conversion device (500 in FIG. 6) may be referred to as a micro inverter. Accordingly, the micro inverter may include a converter (530 in FIG. 6) and an inverter (540 in FIG. 6).

Meanwhile, a transformer and a leakage inductor may be provided in the power converter (500 in FIG. 6) or the converter 530 in the micro inverter.

In particular, in the present invention, a slim transformer is proposed for slimming the power converter (500 in FIG. 6) or the micro inverter.

 To this end, the transformer (UTR) according to an embodiment of the present invention, the base (BAS), and protruding on the base (BAS), a plurality of protruding members (INBo, INBa) disposed in the outer walls (OTBa, OTBb) A core (CRE) having a plurality of bobbins (BOBa, BOBb) spaced apart from each other surrounding each of the plurality of protruding members (INBo, INBa), and windings (CLa) wound around the plurality of bobbins (BOBa, BOBb) CLb). Accordingly, the leakage inductance can be easily adjusted according to the design specification due to the plurality of protruding members INBo and INBa. This will be described later with reference to FIGS. 9A to 11B and the like.

On the other hand, in the present invention, for the slimming of the power converter (500 in FIG. 6), an integrated transformer in which a transformer and a leakage inductor are integrated is proposed. At this time, in order to adjust the leakage inductance in the integrated transformer according to the design specification, it is proposed a shape of the core, which is easy to process. This will be described in more detail in the description of FIG. 12.

Next, FIG. 2 is a diagram showing another example of a solar system including a solar module according to an embodiment of the present invention.

Referring to the drawings, the solar system 10b according to an embodiment of the present invention may include a plurality of solar modules 50a, 50b, ..., 50n, and a gateway 80.

The solar system 10b of FIG. 2 is different from the solar system 10a of FIG. 1 in that a plurality of solar modules 50a, 50b, ..., 50n are connected in parallel to each other.

Each of the plurality of solar modules (50a, 50b, ..., 50n), each solar module (100a, 100b, ..., 100n), and a circuit for converting and outputting DC power from the solar module Junction boxes (200a, 200b, ..., 200n) including a device may be provided.

In the drawings, each junction box 200a, 200b, ..., 200n is shown attached to the back of each solar cell module 100a, 100b, ..., 100n, but is not limited thereto. It is also possible that each junction box 200a, 200b, ..., 200n is spaced apart from each solar cell module 100a, 100b, ..., 100n and separately provided.

On the other hand, cables (31a, 31b, ..., oln) for supplying the AC power output from each junction box (200a, 200b, ..., 200n) to the grid, each junction box (200a, 200b,. .., 200n) can be electrically connected.

Meanwhile, the plurality of photovoltaic modules 50a, 50b, ..., 50n of FIG. 2 may each include a power conversion device. According to an embodiment of the present invention, each power conversion device may include an integrated transformer.

FIG. 3 is a circuit diagram of a junction box inside the solar module of FIG. 1 or 2.

Referring to the drawings, the junction box 200 may convert DC power from the solar cell module 100 and output the converted power.

In particular, in connection with the present invention, the junction box 200 may include a power conversion device for outputting AC power.

To this end, the junction box 200 may include a converter 530, an inverter 540, and a control unit 550 for controlling it.

In addition, the junction box 200 may further include a bypass diode unit 510 for bypass, a capacitor unit 520 for storing DC power, and a filter unit 570 for filtering the output AC power. have.

Meanwhile, the junction box 200 may further include a communication unit 580 for communication with the external gateway 80.

On the other hand, the junction box 200 includes an input current detector (A), an input voltage detector (B), a converter output current detector (C), a converter output voltage detector (D), an inverter output current detector (E), and an inverter output voltage A detector F may be further provided.

Meanwhile, the control unit 550 may control the converter 530, the inverter 540, and the communication unit 580.

The bypass diode unit 510 may include bypass diodes Dc, Db, and Da disposed between first to fourth conductive lines (not shown) of the solar cell module 100. . At this time, the number of bypass diodes is 1 or more, and it is preferable that 1 is smaller than the number of conductive lines.

The bypass diodes Dc, Db, and Da receive solar DC power from the solar cell module 100, particularly from the first to fourth conductive lines (not shown) in the solar cell module 100. Also, the bypass diodes Dc, Db, and Da may be bypassed when a reverse voltage is generated from a DC power source from at least one of the first to fourth conductive lines (not shown).

Meanwhile, the DC power that has passed through the bypass diode unit 510 may be input to the capacitor unit 520.

The capacitor unit 520 may store input DC power input through the solar cell module 100 and the bypass diode unit 510.

On the other hand, in the drawing, the capacitor unit 520 is illustrated as having a plurality of capacitors (Ca, Cb, Cc) connected in parallel with each other, unlike this, a plurality of capacitors, connected in series or parallel mixing, or ground in series It is also possible to be connected to the stage. Alternatively, it is also possible that the capacitor unit 520 includes only one capacitor.

The converter 530 may convert the level of the input voltage from the solar cell module 100 through the bypass diode unit 510 and the capacitor unit 520.

In particular, the converter 530 may perform power conversion by using the DC power stored in the capacitor unit 520.

Meanwhile, the converter 530 according to the embodiment of the present invention will be described in more detail with reference to FIG. 6.

Meanwhile, the switching elements in the converter 530 may turn on / off based on the converter switching control signal from the controller 550. Thereby, the level-converted DC power can be output.

The inverter 540 may convert the DC power converted by the converter 530 into AC power.

In the figure, a full-bridge inverter is illustrated. That is, each of the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b connected in series with each other is a pair, and a total of two pairs of upper and lower arm switching elements are parallel to each other (Sa and S '). a, Sb and S'b). Diodes may be connected in reverse parallel to each of the switching elements Sa, Sb, S'a, and S'b.

The switching elements Sa, Sb, S'a, and S'b in the inverter 540 may be turned on / off based on the inverter switching control signal from the controller 550. Thereby, an AC power source having a predetermined frequency can be output. Preferably, it is desirable to have the same frequency (approximately 60 Hz or 50 Hz) as the alternating frequency of the grid.

Meanwhile, the capacitor C may be disposed between the converter 530 and the inverter 540.

The capacitor C may store the level-converted DC power of the converter 530. Meanwhile, both ends of the capacitor C may be referred to as a dc terminal, and accordingly, the capacitor C may also be referred to as a dc terminal capacitor.

Meanwhile, the input current detection unit A may sense the input current ic1 supplied from the solar cell module 100 to the capacitor unit 520.

Meanwhile, the input voltage detector B may detect the input voltage Vc1 supplied from the solar cell module 100 to the capacitor unit 520. Here, the input voltage Vc1 may be the same as the voltage stored at both ends of the capacitor unit 520.

The sensed input current ic1 and input voltage vc1 may be input to the controller 550.

Meanwhile, the converter output current detector C detects an output current ic2 output from the converter 530, that is, a dc terminal current, and the converter output voltage detector D outputs the output voltage output from the converter 530. (vc2), i.e., detect the dc stage voltage. The sensed output current ic2 and the output voltage vc2 may be input to the controller 550.

On the other hand, the inverter output current detector E detects the current ic3 output from the inverter 540, and the inverter output voltage detector F detects the voltage vc3 output from the inverter 540. The detected current ic3 and voltage vc3 are input to the control unit 550.

Meanwhile, the control unit 550 may output a control signal for controlling the switching elements of the converter 530. In particular, the control unit 550 may detect at least one of the detected input current (ic1), input voltage (vc1), output current (ic2), output voltage (vc2), output current (ic3), or output voltage (vc3). On the basis of this, the turn-on timing signals of the switching elements in the converter 530 may be output.

Meanwhile, the control unit 550 may output an inverter control signal that controls each of the switching elements Sa, Sb, S'a, and S'b of the inverter 540. In particular, the control unit 550 may detect at least one of the detected input current (ic1), input voltage (vc1), output current (ic2), output voltage (vc2), output current (ic3), or output voltage (vc3). On the basis of this, the turn-on timing signals of the switching elements Sa, Sb, S'a and S'b of the inverter 540 may be output.

Meanwhile, the controller 550 may control the converter 530 to calculate a maximum power point for the solar cell module 100 and output DC power corresponding to the maximum power accordingly.

Meanwhile, the communication unit 580 may communicate with the gateway 80.

For example, the communication unit 580 may exchange data with the gateway 80 by power line communication.

Meanwhile, the communication unit 580 may transmit current information, voltage information, power information, and the like of the solar module 50 to the gateway 80.

Meanwhile, the filter unit 570 may be disposed at the output terminal of the inverter 540.

Then, the filter unit 570 includes a plurality of passive elements, and based on at least some of the plurality of passive elements, the phase difference between the alternating current (io) and the alternating voltage (vo) output from the inverter 540 Can be adjusted.

4 to 5 are various examples of the power conversion device of the solar module.

First, the power conversion device 600a of the solar module of FIG. 4 includes a capacitor unit 620, a converter 630, an inverter 640, and a filter unit 670.

The converter 630 of FIG. 4 is provided with an interleaved flyback converter, and accordingly, since the transformers T1a and T1b are used, the input side and the output side are isolated, and the voltage conversion ratio is excellent, and the power factor is (pf) There is a disadvantage that it is difficult to control.

Next, the power conversion device 600b of the solar module of FIG. 5 includes a capacitor unit 620b, a power conversion unit 640b, and a filter unit 670b.

The power conversion unit 640b of FIG. 5 includes, in addition to the switching elements S1b to S4b, a diode Dbb and a switching element Sbb associated with the full bridge inverter.

According to the power conversion unit 640b of FIG. 5, power factor (pf) control is possible, but in a non-isolated form, the voltage conversion ratio is low, and in order to satisfy the regulations for leakage current, separate protection There is a disadvantage that a circuit is required. In addition, during switching, hard switching loss due to hard switching occurs, and thus, power conversion efficiency is low.

On the other hand, in the present invention, in a two-stage (stage) -based power conversion device, it proposes a method capable of stable power output. In addition, a method for reducing the loss of output power is proposed.

6 is a circuit diagram of a power conversion device in a solar module according to an embodiment of the present invention, and FIGS. 7A to 7B are views referred to for description of the power conversion device of FIG. 6.

Referring to the drawings, the power conversion device 500 in the solar module 100 according to an embodiment of the present invention, the converter 530, the inverter 540 shown in the drawing, in addition, the bypass diode unit of Figure 3 510, capacitor 520, control unit 550, communication unit 580, input current detection unit (A), input voltage detection unit (B), converter output current detection unit (C), converter output voltage detection unit (D), An inverter output current detection unit E and an inverter output voltage detection unit F may be provided.

Meanwhile, a filter unit 570 for reducing electromagnetic noise may be further disposed at an output terminal of the inverter 540. In this case, the filter unit 570 may include at least one inductor.

Hereinafter, the converter 530 illustrated in FIG. 6, the inverter 540, and the like will be mainly described.

The power conversion device 500 in the solar module 100 according to an embodiment of the present invention includes a solar cell module 100 having a plurality of solar cells 130 and input from the solar cell module 100. 1 A converter 530 that converts the level of DC power Vin and outputs a second DC power, an inverter 540 that converts DC power from converter 530 to AC power Vac, and a converter ( 530) and a control unit 550 that controls the inverter 540.

On the other hand, the converter 530 according to an embodiment of the present invention, the full-bridge switching unit 532 to perform the switching for the first DC power supply (Vin), and the output side of the full-bridge switching unit 532 (na) , nb) may be provided with a transformer 536 connected to, and a half-bridge switching unit 538 connected to the output side nc, nd of the transformer 536.

Meanwhile, the control unit 550 may control the switching frequencies of the full bridge switching unit 532 and the half bridge switching unit 538 to be varied during the first periods Pba and Pbb. Accordingly, even when the DC power supply (Vin) from the input solar cell module 100 is low, it is possible to output a stable power without limiting the power range that can be output.

In addition, it is possible to reduce switching losses in a two-stage based power converter.

Meanwhile, the converter 530 in the power converter 500 in the solar module 100 may further include an inductor Lr connected between the transformer 536 and the half-bridge switching unit 538.

The inductor Lr at this time is necessary for energy transfer between the transformer 536 and the half-bridge switching unit 538.

In particular, the inductor Lr provides leakage inductance and can be used for resonance in a resonant converter.

Meanwhile, the present invention proposes an integrated transformer module (UTR) that integrates the transformer 536 and the leakage inductor Lr for slimming the power converter 500. This will be described later with reference to FIG. 9A and below.

As shown in the figure, the full bridge switching unit 532 includes first to second switching elements Q1 and Q2 connected in parallel with each other, and first to second switching elements Q1 and Q2 respectively connected in series. The third to fourth switching elements Q3 and Q4 may be provided.

In addition, the first node N1 between the first switching element Q1 and the second switching element Q2 and the second node between the third switching element Q3 and the fourth switching element Q4 ( N2), the input side (na, nb) of the transformer 536 may be connected.

Meanwhile, as shown in the drawing, the half-bridge switching unit 538 includes a fifth switching element Q5 and a sixth switching element Q6 connected in series with each other, a first capacitor C1 and a second capacitor connected in series with each other. Capacitor C2 may be included.

In this case, the fifth switching element Q5, the sixth switching element Q6, and the first capacitor C1 and the second capacitor C2 may be connected in parallel to each other.

The third node N3 is between the fifth switching element Q5 and the sixth switching element Q6, and the fourth node N4 is between the first capacitor C1 and the second capacitor C2. In between, the output side nc, nd of the transformer 536 can be connected.

Meanwhile, the control unit 550 may output a switching control signal Sfb for switching of the full bridge switching unit 532.

Meanwhile, the control unit 550 may output a switching control signal Shb for switching of the half-bridge switching unit 538.

Meanwhile, the control unit 550 may output a switching control signal Sic for switching of the inverter 540.

Meanwhile, the control unit 550 may control the switching frequencies of the full bridge switching unit 532 and the half bridge switching unit 538 to vary according to the waveform of the output voltage Vac of the inverter 540.

7A illustrates a waveform when a current flows from the converter 530 to the inverter 540, and FIG. 7B illustrates a waveform when a current flows from the inverter 540 to the converter 530. At this time, the inverter 540 may be a bi-directional inverter. Meanwhile, it is also possible that the converter 530 is a bidirectional converter.

Meanwhile, for comparison with the integrated transformer of FIG. 6, the conventional transformers of FIGS. 8A to 8B will be described.

8A to 8E are views referred to in the description of the transformer.

First, FIG. 8A illustrates an example of a general resonant transformer TRxa.

Referring to the drawings, the general resonant transformer (TRxa) is divided into an upper core (UPCR), an upper winding (WNDXa) wound on a bobbin, a lower core (DNCR), and a lower winding (WNDXb) wound on a bobbin, upper and lower sides. An air gap (SPAx) is arranged in the middle. However, in this case, since the central core space is fixed, there is a disadvantage that it is not easy to adjust the leakage inductance.

Next, FIG. 8B illustrates an example of an integrated transformer.

Referring to the drawings, the inner core CREx of the integrated transformer includes an outer wall OTBx, an outer wall OTBx, a circular inner wall INBbx, and a circular second inner wall INBbx surrounding the circular inner wall INBbx. ). However, since the inner wall (INBbx) and the second inner wall (INBax), which make leakage inductance, have a circular, elliptical, or polygonal shape, processing is not easy, and accordingly, the leakage inductance can be easily made according to the design specification. It cannot be adjusted.

In addition, since the opening OPx is disposed on only one side, a conductive line electrically connected to the winding must be disposed through one opening OPx, thereby increasing the risk of short.

Next, FIGS. 8C to 8E illustrate examples of transformers.

First, FIG. 8C illustrates a core CREy in which one protruding member INBy is formed in the outer wall OTBy, and bidirectional openings OPax and OPbx are formed. The windings extend outwards through the bidirectional openings OPax and OPbx.

Next, FIG. 8D illustrates a bobbin (BOBy) detachable from the core (CRE) of FIG. 8C, and FIG. 8E illustrates a transformer (UTRy) including the bobbin (BOBy) and the core (CRE) of FIG. 8.

The winding CLy is wound in the inner groove IWH formed between the plates Fmay and Fmby of the bobbin BOBy, and the winding extends to the outside through the connecting members Legay, Legby, and Legvy.

The protruding member INBy of the core CRE is coupled to the opening OPby of the bobbin BOBy.

Meanwhile, FIGS. 8C to 8E have a disadvantage in that it is not easy to manufacture a transformer that meets design specifications according to the transformer UTRy.

Accordingly, hereinafter, a structure of a transformer that can be easily processed and easily changed its shape is proposed.

9A is a view showing a core in a transformer according to an embodiment of the present invention.

Referring to the drawings, the core (CRE) in the transformer (UTR) according to an embodiment of the present invention, the base (BAS), the outer wall (OTBa, OTBb), and protruding on the base (BAS), the outer wall (OTBa, OTBb) may be provided with a plurality of protruding members (INBo, INBa).

In the drawing, it is exemplified that the plurality of protruding members INBo and INBa are two, but is not limited thereto, and three or more are possible.

Meanwhile, the openings OPa and Opb may be formed between the outer walls OTBa and OTBb formed on the base BAS.

Through the openings OPa and Opb, an external conductive line or the like can be input or output and electrically connected to a winding wound on the bobbins BINB and BOTB mounted on the core CRE.

On the other hand, it is also possible that one opening is formed instead of the drawings and the plurality of openings OPa and Opb.

On the other hand, in the drawing, although a plurality of protruding members (INBo, INBa) is illustrated in a circular shape, unlike this, it is also possible to oval. That is, the shape of the plurality of protruding members INBo and INBa can be variously formed as long as the first bobbin BINB can be attached.

Meanwhile, the base BAS in the core CRE, the outer walls OTBa, OTBb, and the plurality of protruding members INBo, INBa may be formed of the same material. Accordingly, the core CRE can be easily manufactured by molding or the like.

Meanwhile, the heights of the plurality of protruding members INBo and INBa may be the same. Accordingly, the core CRE can be easily manufactured by molding or the like.

9B is a view showing a bobbin structure in a transformer according to an embodiment of the present invention.

Referring to the drawings, the bobbin structure (BOB) in the transformer (UTR) according to an embodiment of the present invention, a plurality of bobbins (BOBa, BOBb) corresponding to the plurality of protruding members (INBo, INBa) of Figure 9a You can.

In the drawing, the bobbin structure (BOB) is illustrated to include two bobbins (BOBa, BOBb) corresponding to the plurality of protruding members (INBo, INBa) of FIG. 9A, but is not limited thereto, and three or more bobbins It is also possible to include.

The windings CLa and CLb may be wound around the first groove and the second groove formed between the three plates Fhaa, INHa, and Fhab of the first bobbin BOBa.

The windings CLa and CLb may be wound around the first groove formed between the three plates Fhba, INHb, and Fhbb of the second bobbin BOBb and the second groove.

On the other hand, the plurality of bobbins (BOBa, BOBb) are connected by connecting members (BCWa, BCWb). Accordingly, a plurality of bobbins (BOBa, BOBb) can be fixed.

On the other hand, the openings OPaa and OPba of the plurality of bobbins BOBa and BOBb are coupled to the plurality of protruding members INBo and INBa of the core CRE of FIG. 9A.

On the other hand, the first connecting member (Lega) and the second connecting member (Legb) connected to any one of the plurality of bobbins (BOBa, BOBb), one of the first opening (OPa) and the second opening (OPb) It extends out through one.

In the drawing, it is illustrated that the first connecting member Lega and the second connecting member Legb are connected to the second bobbin BOBb among the plurality of bobbins BOBa and BOBb.

The first connecting member (Lega) and the second connecting member (Legb) through the second opening (OPb) of the first opening (OPa) and the second opening (OPb) formed in the core (CRE) of Figure 9a, the outside Can be extended to Accordingly, it is possible to easily mount the transformer (UTR) on an external circuit board.

10 is a view showing a transformer according to an embodiment of the present invention.

Referring to the drawings, the transformer (UTR) according to an embodiment of the present invention, the base (BAS), and protruding on the base (BAS), a plurality of protruding members (INBo, INBa) disposed in the outer walls (OTBa, OTBb) ), The core (CRE), and a plurality of bobbins (BOBa, BOBb) that surround each of the plurality of protruding members (INBo, INBa), and are wound around the plurality of bobbins (BOBa, BOBb). CLa, CLb). Accordingly, it is easy to process and the shape can be easily changed.

In the drawing, it is illustrated that the openings of the plurality of protruding members INBo, INBa and the plurality of bobbins BOBa, BOBb are combined. Accordingly, it is possible to implement a slim transformer (UTR).

On the other hand, if the capacity of the transformer (UTR) should be large, it is also possible to include three or more protruding members and a corresponding number of bobbins, unlike the drawings. Accordingly, it is easy to manufacture a transformer that meets design specifications.

11A is a diagram showing the current direction and the magnetic flux when the winding CL is wound on one bobbin BOB.

In the drawing, it is illustrated that when the current Im flows in the clockwise direction, the magnetic flux MF is generated in the y-axis direction.

11A is a diagram showing the current direction and the magnetic flux when the windings CLa and Clb are wound on two bobbins BOBa and BOBb.

In the drawing, it is illustrated that the current Im flows in the x-axis direction at the top of the bobbins BOBa and BOBb, and the current Im flows in the -x-axis direction at the bottom of the bobbins BOBa, BOBb.

Accordingly, a magnetic flux MF is generated in the y-axis direction. In particular, compared to Figure 11a, approximately twice the magnetic flux is generated, it is possible to increase the capacity of the transformer (UTR).

As described above, by adjusting the number of bobbins while adjusting the number of protruding members in the core, it is possible to easily perform the manufacture of the transformer (UTR) according to the design specification.

12 is a view illustrating a core of a transformer according to an embodiment of the present invention, and FIGS. 13A to 13C are views referred to in the description of FIG. 12.

Referring to the drawings, the core (CREb) in the integrated transformer of Figure 12, the base (BAS), the outer wall (OTBa, OTBb) formed on the base (BAS), and protruding on the base (BAS), the outer wall (OTBa , OTBb may include a plurality of protruding members (INBo, INBa), and a plurality of protruding members (INBo, INBa) and an additional protruding member (INBb) spaced apart.

In FIG. 12, it is illustrated that the openings OPa and Opb are formed between the outer walls OTBa and OTBb formed on the base BAS.

In the drawing, it is illustrated that the additional protruding member INBb is disposed in the direction of the second opening Opb, which is one of the plurality of openings OPa and Opb.

That is, it is illustrated that an additional protruding member INBb is disposed adjacent to the second protruding member INBa among the plurality of protruding members INBo and INBa.

Through the openings OPa and Opb, an external conductive line or the like can be input or output and electrically connected to a winding wound on the bobbins BINB and BOTB mounted on the core CREb.

Meanwhile, unlike FIG. 12, it is also possible that one opening is formed instead of a plurality of openings OPa and Opb.

On the other hand, in the drawing, although a plurality of protruding members (INBo, INBa) is illustrated in a circular shape, unlike this, it is also possible to oval. That is, the shape of the plurality of protruding members (INBo, INBa) can be various shapes if a plurality of bobbins (BOBa, BOBb) can be attached.

On the other hand, in the core (CREb), the base (BAS), the outer wall (OTBa, OTBb), a plurality of protruding members (INBo, INBa), and the additional protruding member (INBb), may be formed of the same material. For example, it may be formed of ferrite or the like.

On the other hand, when the core (CREb) is formed of a material of ferrite, it is preferable that the core (CREb) is manufactured by a molding technique or the like. Accordingly, the core CREb can be easily manufactured.

On the other hand, in the integrated transformer (UTRb) integrating the transformer 536 and the leakage inductor (Lr) shown in Figure 6, the leakage inductance of the leakage inductor (Lr) to be manufactured according to the design specifications, by molding techniques, In the manufactured core (CREb), it is necessary to finely process the additional protruding member (INBb).

In particular, since the leakage inductance is determined by the height difference (hdf in FIG. 13B) between the plurality of protruding members INBo, INBa and the additional protruding member INBb, in the manufactured core CREb, the additional protruding member INBb It is necessary to process the height of).

At this time, as illustrated in FIG. 8B, the inner core CREx, the outer inner wall OTBx, the outer inner wall OTBx, the circular inner wall INBbx, and the circular inner wall INBbx surrounding the circular second inner wall INBax When having a, there is a disadvantage that it is difficult to fine-process the circular inner wall (INBax).

Accordingly, in the present invention, for convenience of fine processing of the additional protruding member INBb, the additional protruding member INBb facing the plurality of protruding members INBo, INBa, rather than the outer periphery of the plurality of protruding members INBo, INBa ), So that the length of the corner is smaller. Accordingly, the processing of the additional protruding member INBb is easy, so that the leakage inductance can be easily adjusted according to the design specification.

In particular, as shown in Figure 13a, the plurality of protruding members (INBo, INBa) in the core (CREb) according to an embodiment of the present invention has a circular, elliptical, or polygonal shape, and the outer circumference of the plurality of protruding members (INBo, INBa) It is preferable that the length HLb of the edge of the additional protruding member INBb opposite to the plurality of protruding members INBo, INBa is smaller than half of HLA. Accordingly, the processing of the additional protruding member INBb is easy, so that the leakage inductance can be easily adjusted according to the design specification.

On the other hand, the core (CREb) according to an embodiment of the present invention, the more the distance between the center of the additional protruding member (INBb), the greater the spacing between the plurality of protruding members (INBo, INBa) and the additional protruding member (INBb) It is preferred.

In FIG. 13A, the distance between the plurality of protruding members INBo and INBa in the vicinity of the center and the additional protruding member INBb is DRa, and the plurality of protruding members INBo and INBa in the vicinity of the side and the additional protruding member ( It is exemplified that the interval between INBb) is DRb greater than DRa. Thereby, winding of a winding becomes easy.

On the other hand, the plurality of protruding members (INBo, INBa) in the core (CREb) according to an embodiment of the present invention, as shown in Figure 13a, has a circular, elliptical, or polygonal shape, the additional protruding member (INBb) has a curved shape Can have Thereby, winding of a winding becomes easy.

13B is a cross-sectional view taken along line I-I 'of FIG. 12.

Referring to the drawings, the core (CREb), the base (BAS), the outer wall (OTBa, OTBb) formed on the base (BAS), and protruding on the base (BAS), disposed on the outer wall (OTBa, OTBb) It may include a plurality of protruding members (INBo, INBa), and additional protruding members (INBb).

At this time, it is preferable that the protruding heights hb of the additional protruding members INBb are the same or smaller than the protruding heights ha of the plurality of protruding members INBo, INBa. Accordingly, it is possible to easily adjust the leakage inductance according to the difference in height (ha) between the additional protruding members INBb and the plurality of protruding members INBo, INBa.

On the other hand, it is also possible to have a protrusion height (ha) of a plurality of protrusion members (INBo, INBa) of the additional protrusion member and a protrusion height (hb) of the additional protrusion member (INBb).

On the other hand, the height of the base BAS may be smaller than the protruding height hb of the additional protruding member INBb. Accordingly, the overall height of the core CREb can be lowered, and accordingly, the slim core CREb can be manufactured.

13C is a diagram illustrating a transformer (UTRb) having a bobbin structure (BOBm) having a first bobbin and a second bobbin attached to the core (CREb) of FIG. 12.

The bobbin structure BOBm includes a first bobbin BOBa surrounding the plurality of protruding members INBo, INBa, a plurality of protruding members INBo, INBa in the core CREb, and an additional protruding member INBb. A second bobbin (BOBb) may be provided.

Meanwhile, the bobbin structure BOBm may further include a connecting member connecting the first bobbin BOBa and the second bobbin BOBb. Accordingly, the shapes of the first bobbin BOBa and the second bobbin BOBb can be maintained.

On the other hand, any one of the plurality of bobbins (BOBa, BOBb), one of the plurality of protruding members (INBo, INBa) and the additional protruding member (INBb) surrounds together. Thereby, winding of a winding becomes easy.

Meanwhile, since the additional protruding member INBb is disposed adjacent to the second protruding member INBa among the plurality of protruding members INBo, INBa, the second bobbin BOBb further protrudes from the second protruding member INBa. It surrounds the member INBb together. Thereby, winding of a winding becomes easy.

Meanwhile, as illustrated in FIG. 13C, the first winding CLa and the second winding CLb may be wound around the first groove and the second groove formed in the plurality of bobbins BOBa and BOBb, respectively.

On the other hand, the bobbin structure (BOBm) is disposed in the first opening (OPa) direction, and the first connection member (Lega) and the second connection that is electrically connected to the first winding (CLa) and the second winding (CLb), respectively A member (Legb) may be further provided. Accordingly, it is possible to electrically connect with external circuit elements.

Meanwhile, the first bobbin BOBa and the second bobbin BOBb in the bobbin structure BOBm may be detached from the core CREb. Therefore, the manufacture of the transformer (UTRb) becomes easy.

Meanwhile, the first winding CLa may correspond to the primary side of the transformer 536 of FIG. 6, and the second winding CLb may correspond to the secondary side of the transformer 536 of FIG. 6.

14 is an exploded perspective view of the solar cell module of FIG. 1 or 2.

Referring to FIG. 14, the solar cell module 100 of FIG. 2 may include a plurality of solar cells 130. In addition, the first sealing material 120 and the second sealing material 150 located on the lower surface and the upper surface of the plurality of solar cells 130, the rear substrate 110 and the second substrate located on the lower surface of the first sealing material 120 The front substrate 160 positioned on the top surface of the sealing material 150 may be further included.

First, the solar cell 130 is a semiconductor device that converts solar energy into electrical energy, a silicon solar cell, a compound semiconductor solar cell and a tandem solar cell, It may be a dye-sensitized or CdTe, CIGS type solar cell, thin film solar cell, and the like.

The solar cell 130 is formed of a light receiving surface to which sunlight enters and a back surface opposite to the light receiving surface. For example, the solar cell 130 includes a first conductivity type silicon substrate, a second conductivity type semiconductor layer formed on the silicon substrate, and having a conductivity type opposite to that of the first conductivity type and a second conductivity type semiconductor layer. An antireflection film formed on the second conductivity type semiconductor layer and including at least one opening to expose a portion of the surface, and a front electrode contacting a portion of the second conductivity type semiconductor layer exposed through the at least one opening; , May include a back electrode formed on the back surface of the silicon substrate.

Each solar cell 130 may be electrically connected in series or in parallel or in parallel. Specifically, the plurality of solar cells 130 may be electrically connected by a ribbon 133. The ribbon 133 may be bonded to a front electrode formed on the light receiving surface of the solar cell 130 and a rear electrode current collecting electrode formed on the back surface of another adjacent solar cell 130.

In the drawing, the ribbon 133 is formed in two rows, and the solar cell 130 is connected in series by the ribbon 133 to illustrate that the solar cell string 140 is formed.

For example, six strings are formed, and each string may include ten solar cells.

The rear substrate 110, as a back sheet, functions as a waterproof, insulating, and UV protection, and may be a Tedlar / PET / Tedlar (TPT) type, but is not limited thereto. In addition, although the rear substrate 110 is shown in a rectangular shape in FIG. 3, it may be manufactured in various shapes such as a circular shape and a semicircular shape according to the environment in which the solar cell module 100 is installed.

On the other hand, the first sealing material 120 on the back substrate 110 may be formed by being attached to the same size as the back substrate 110, a plurality of solar cells 130 on the first sealing material 120, several columns It can be located next to each other to achieve.

The second sealing material 150 is located on the solar cell 130 and can be bonded to the first sealing material 120 by lamination.

Here, the first sealing material 120 and the second sealing material 150 allow each element of the solar cell to be chemically bonded. The first sealing material 120 and the second sealing material 150 may be various examples, such as an ethylene vinyl acetate (EVA) film.

Meanwhile, the front substrate 160 is positioned on the second sealing material 150 to transmit sunlight, and is preferably tempered glass to protect the solar cell 130 from external impact. In addition, it is more preferable that it is a low iron tempered glass containing less iron in order to prevent reflection of sunlight and increase the transmittance of sunlight.

The transformer according to the present invention, the power conversion device including the transformer, and the solar module provided with the power conversion device are not limited to the configuration and method of the embodiments described as described above, but the embodiment The examples may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. In addition, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical idea or prospect of the present invention.

Claims (14)

A core having a base and a plurality of protruding members protruding on the base and disposed in an outer wall;
A plurality of bobbins surrounding each of the plurality of protruding members and spaced apart from each other;
Transformer comprising a; winding that is wound on the plurality of bobbins. According to claim 1,
The plurality of bobbins, characterized in that the transformer is connected by a connecting member. According to claim 1,
The plurality of protruding members are circular, elliptical, or polygonal,
Transformer, characterized in that the height of the plurality of protruding members are the same. According to claim 1,
The base, the outer wall, and the plurality of protruding members in the core, characterized in that the transformer is formed of the same material. According to claim 1,
A first opening and a second opening facing each other are formed on the outer wall in the core,
A transformer characterized in that the first connecting member and the second connecting member connected to any one of the plurality of bobbins extend outward through one of the first opening and the second opening. According to claim 1,
The winding,
A transformer comprising a first winding wound around a first groove formed in the plurality of bobbins, and a second winding wound around a second groove formed in the plurality of bobbins. The method of claim 6,
The first winding is electrically connected to the first connecting member,
The second winding, characterized in that the transformer is electrically connected to the second connecting member. According to claim 1,
The core,
And a plurality of additional protruding members spaced apart from the plurality of protruding members and having different shapes. The method of claim 8,
A transformer characterized in that the projecting heights of the additional projecting members are equal to or smaller than the projecting heights of the plurality of projecting members. The method of claim 8,
The plurality of protruding members have a circular, elliptical, or polygonal shape,
A transformer characterized in that the edge of the edge of the additional protruding member is smaller than half of the outer periphery of the plurality of protruding members. The method of claim 8,
The more the distance from the center of the additional protruding member to the side, the greater the spacing between the plurality of protruding members and the additional protruding member. The method of claim 8,
A transformer characterized in that any one of the plurality of bobbins surrounds any one of the plurality of protruding members and the additional protruding member. A power conversion device comprising a transformer of any one of claims 1 to 12. A solar module comprising the power conversion device of claim 13 in one piece.

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