JP2005312159A - Power converter and solar power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power converter which is thin and which has a small projection area by considering a transformer with few number of turns of a primary winding. <P>SOLUTION: The power converter includes a circuit board 102 having a cutout part 104 and the transformer 101 arranged at the cutout part 104. The transformer 101 has a winding 202 which has both ends forming a terminal 202a arranged on the first side face of the transformer 101 and a terminal 202b arranged at a second side face crossed with the first side face. The terminals 202a, 202b are electrically connected to the one surface of the circuit board 102. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power converter and a solar power generation device, and for example, relates to power conversion of solar cell output.

  In recent years, electronic devices have been reduced in size and thickness, and the flow has been extended to power supply devices. The biggest obstacle to making power supply devices thinner and smaller is the passive components such as coils and capacitors, and technological development relating to the thinning and miniaturization of these components is thriving. On the other hand, a method for solving this problem has been studied in mounting technology. For example, a power switching power supply described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-14150) is a coil that is difficult to reduce in thickness and size. The power conversion device is made thin by using a mounting substrate in which a transformer can be embedded in a notch or a hole in the substrate.

  One field in which such a power conversion device needs to be reduced in size and thickness is a solar power generation device in which the power conversion device is directly attached to a solar cell. A module in which the above-described thin power converter is directly attached to a solar cell can freely set the output voltage of the module, and can be applied to various applications. Further, if this module is used, there is an advantage that the problem of the cost increase due to construction costs when serializing solar cells and the problem of reverse bias to the solar cells due to partial shadows generated by serialization are eliminated.

  As a typical form of a solar power generation device incorporating such a power conversion device, there is one described in Non-Patent Document 1.

  However, it is necessary for the above-described module power conversion device to input low-voltage and large-current power directly from the solar cell and convert it to high-voltage and small-current power. For this purpose, the voltage step-up ratio is as high as 100 or more, and a transformer with a high step-up ratio is required in the power converter. In particular, when outputting AC power from a module and connecting it to a commercial power system, the output voltage of the solar cell needs to be boosted to at least about 175 V, and the boosting ratio of the transformer is desired to be 125 or more.

  A push-pull circuit is mentioned as a preferable circuit configuration of the above power converter. FIG. 1 is a diagram showing a configuration example of a transformer 401 for a push-pull circuit. Windings 402 and 403 are primary windings connected to a solar cell, and winding 404 is a secondary winding connected to a load. Is a line. In order to reduce the size of such a transformer, it is important to reduce the number of turns of the primary winding. However, when the number of turns of the primary winding is reduced, the method of drawing out the winding has a significant influence on the characteristics of the transformer and, consequently, the characteristics of the power converter. This effect is significant when a large current flows through the primary winding and a thick wire is used to suppress power loss in the primary winding. Further, in the conventional winding method and winding method, it is difficult to make the lengths (winding lengths) of the two primary windings 402 and 403 the same.

  Furthermore, the difference in resistance that occurs due to the different winding lengths, and the difference in leakage inductance that changes slightly depending on the positional relationship of the windings with respect to the core, is so large that it cannot be ignored for primary windings with a small number of turns. Become.

JP 2000-14150 Markus Wuest, Peter Toggweiler, Jon Riatsch, "SINGLE CELL CONVERTER SYSTEM (SCCS)", First WCPEC, Hawaii, Dec. 5-9, p. 813-815, 1994

  The present invention solves the above-described problems individually or collectively, and an object thereof is to provide a power converter that is thin and has a small projected area in consideration of a transformer having a small number of primary windings.

  The present invention has the following configuration as one means for achieving the above object.

  A power converter according to the present invention includes a circuit board having a notch and a transformer disposed in the notch, and the transformer has both ends disposed on a first side surface of the transformer. A first terminal and a winding forming a second terminal disposed on a second side intersecting the first side, wherein the first and second terminals are one of the circuit boards. Each surface is electrically connected to each other.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A first winding forming a second terminal disposed on a second side intersecting with the side surface, and a third winding disposed on a third side opposite to the first side. A second winding forming a terminal and a fourth terminal disposed on the second side surface, wherein the first and second terminals are on one side of the circuit board, The four terminals are electrically connected to the other surface of the circuit board, respectively.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer; A winding that forms a second terminal disposed on a second side that intersects the first side; wherein the first terminal is on one side of the circuit board and the second terminal is Each of the circuit boards is electrically connected to the other surface.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A first winding forming a second terminal disposed on a second side intersecting with the side surface, and a third winding disposed on a third side opposite to the first side. A second winding forming a terminal and a fourth terminal disposed on the second side surface, wherein the first and third terminals are disposed on one side of the circuit board on the second and second sides. The four terminals are electrically connected to the other surface of the circuit board, respectively.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A winding that forms a second terminal disposed on a second side opposite the first side; wherein the first terminal is on one side of the circuit board and the second terminal is the The circuit board is electrically connected to the other surface of the circuit board.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A first winding forming a second terminal disposed on a second side opposite to the first side; and a third terminal disposed on the first side and both ends of the first winding A second winding forming a fourth terminal disposed on two side surfaces, wherein the first and third terminals are on one side of the circuit board, and the second and fourth terminals are Each of the circuit boards is electrically connected to the other surface.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A winding that forms a second terminal disposed on a second side facing the first side, wherein the first and second terminals are each electrically connected to one side of the circuit board; It is characterized by being.

  A circuit board having a notch, and a transformer disposed in the notch, the transformer having a first terminal whose both ends are disposed on a first side surface of the transformer, and the transformer A first winding forming a second terminal disposed on a second side opposite to the first side; and a third terminal disposed on the first side and both ends of the first winding A second winding forming a fourth terminal disposed on two side surfaces, wherein the first and second terminals are on one side of the circuit board, and the third and fourth terminals are Each of the circuit boards is electrically connected to the other surface.

  A photovoltaic power generation apparatus according to the present invention includes any one of the power converters described above and a solar battery that supplies DC power to the power converter.

  According to the present invention, it is possible to obtain a power converter that is thin and has a small projected area in consideration of a transformer having a small number of primary windings.

  Preferred embodiments of a transformer, a mounting board, and a power converter using them according to the present invention will be described below in detail with reference to the drawings.

  FIG. 2 is a diagram illustrating a configuration example of the mounting board according to the first embodiment. Reference numeral 101 denotes a transformer and reference numeral 102 denotes a board. FIG. 3 is an exploded perspective view of the transformer 101 used in the first embodiment. The transformer 101 has a primary winding of 3 turns and a secondary winding of 600 turns to form a transformer with a high boost ratio (1: 200).

  The transformer 101 is disposed in a notch 104 provided at one end of the substrate 102, and the primary winding and the secondary winding of the transformer 101 are electrically connected to the corresponding connection portions (electrodes) of the substrate 102, respectively. The

  FIG. 4 is a circuit diagram showing a configuration example of the power conversion device 715 using the substrate 102 described above. The DC power input from the solar cell 703 is boosted and supplied to the load 716.

  Hereinafter, the components of the transformer 101 will be described in detail.

[Trance]
As shown in FIG. 3, the transformer 101 has a secondary winding 203 wound on a bobbin 204, and an insulating tape is wound on the secondary winding 203 as necessary. After winding 202, the core 205 is inserted into the through hole of the bobbin 204.

  FIG. 5 is a diagram showing an outline after the transformer 101 is assembled. Both ends of the secondary winding 203 are electrically connected to terminals 206a and 206b fixed to the bobbin 204.

  The primary winding 201 is wound from the back of the figure to the front and from the front to the back with the end 201a as the winding start end, and is sent to the right in the figure, and the winding end is the end 201b. . On the other hand, the primary winding 202 is wound from the front of the figure to the back and from the back to the front with the end 202a as a winding start end and is sent to the left in the figure, and the winding end is 202b. .

  After the winding is completed, core 205 is inserted into the through hole of bobbin 204 from both sides, and adhesive tape is wound along the outer surface of core 205 to fix cores 205 together, and core 205 and bobbin 204 are integrated. Then, the transformer 101 is formed.

  FIG. 6 is a side view of the transformer 101 after assembly. As shown in FIG. 6, terminal portions 206a and 206b to which the primary windings 201 and 202 and the secondary winding 203 are connected are extended from the core 205 to the outside.

  In this way, the end portions 201a, 201b, 202a and 202b of the primary windings 201 and 202 shown in FIGS. 5 and 6 are formed. These end portions are electrically connected to connection portions (electrodes) on the substrate 102 as described later. Here, as shown in FIG. 5 and FIG. 6, the end portions 202a and 202b or the end portions 201a and 201b arranged on the same surface side with respect to the transformer 101 are not suitable when mounted on the substrate 102. It is pulled out so that it may be arrange | positioned on the substantially same surface of the grade which does not arise. Further, depending on the thickness of the substrate 102 on which the transformer 101 is mounted, the end portions of the primary windings 201 and 202 and the terminals 206a and 206b may be subjected to processing such as bending. The end portions 201a, 201b, 202a and 202b, and the terminals 206a and 206b described above are soldered to the substrate 102 by a predetermined mounting method, for example, so that the transformer 101 for push-pull circuit shown in FIG. As shown in the basic diagram of FIG.

[core]
The core 205 used in Example 1 is not limited, but it is preferable to use an Mn-Zn-based or Ni-Zn-based ferrite core because the working temperature and the desired shape can be easily formed. A large magnetic material core is preferred. The main leg inserted into the through hole of the bobbin 204, the secondary winding 203 wound around the bobbin 204, the side legs disposed outside the primary windings 201 and 202, and the main leg and the side legs A shape having a bridging portion to be connected is preferable.

  The shape of the core 205 used in Example 1 is, for example, the EE type described in JIS C 2514 `` E type ferrite magnetic core '' in order to adopt the end lead-out configuration shown in FIGS. 5 and 6 and the terminal arrangement, EI type, EER type, EIR type and the like are preferable.

[Bobbin]
The bobbin 204 used in the first embodiment is not limited, but the shape of the through hole is determined according to the cross-sectional shape of the middle leg of the core 205 to be inserted, such as a square, an ellipse, or a circle.

  As the material of the bobbin 204, a resin such as polybutylene terephthalate, polyamide, phenol, or epoxy is used, and a glass filling grade is used as necessary.

  In addition, by using a flat copper wire or a self-bonding type electric wire for the winding, a through-hole into which the core 205 is inserted can be formed, and the transformer 101 can be created without using the bobbin 204.

[Winding]
There is no limitation on the wire for winding used in the present embodiment, but any wire having heat resistance, flexibility, oil resistance, solderability, insulation durability, etc. suitable for the use conditions and production conditions of the transformer 101 is available. That's fine.

  Specifically, type 1 oil-based enameled copper wire, type 2 oil-based enameled copper wire, type 0 formal copper wire, type 1 formal copper wire, type 2 formal copper wire as listed in JIS C 3202 “Enameled wire” , 0 type formal aluminum wire, 1 type formal aluminum wire, formal rectangular copper wire, 0 type polyester copper wire, 1 type polyester copper wire, 2 type polyester copper wire, 1 type polyurethane copper wire, 2 type polyurethane copper wire, 3 types Polyurethane copper wire, Type 0 fusible polyurethane copper wire, Type 1 fusible polyurethane copper wire, Type 2 fusible polyurethane copper wire, Type 0 polyesterimide copper wire, Type 1 polyesterimide copper wire, or Type 2 polyesterimide copper Lines can be used.

  The transformer 101 is disposed in the notch 104 of the substrate 102, and the weight of the transformer 101 is supported by the winding extending from the transformer 101 and the terminals 206a and 206b fixed to the bobbin 204. , 202 preferably has rigidity capable of withstanding the weight of the transformer 101. In addition, it is preferable that the primary windings 201 and 202 of Example 1 have stable characteristics even when the number of turns is small. Taking these conditions into account, the copper wire for the primary windings 201 and 202 of Example 1 is flat copper because of the low loss when a large current is passed and less waste of space (high space efficiency). Lines are preferred.

  Further, if a litz wire obtained by twisting a plurality of wires mentioned in the “enameled wire” is used as the primary windings 201 and 202, loss due to the skin effect can be reduced. Alternatively, a multi-parallel enameled wire in which a plurality of “enameled wires” are integrated in parallel can be used from the viewpoint of loss or rigidity. Furthermore, if a wire having a three-layer insulation coating is used, an insulating material such as an insulating tape for insulating between the secondary winding 203 and the primary windings 201 and 202 can be omitted. The number of steps can be saved, and the transformer 101 can be made thinner and smaller accordingly.

[Specific examples of transformers]
EE12 type core of Hitachi Ferrite Electronics Co., Ltd. is used as the core 205. Solder one end of a type 1 polyurethane wire (1UEW) with a diameter of 0.08mm to the terminal 206a of the bobbin 204 that adapts to this core, align the wire on the bobbin part of the bobbin 204 and wind it 600 times in multiple layers, The other end of the coil is soldered to the terminal 206b to form the secondary winding 203.

  Next, if necessary, an insulating tape is wound on the secondary winding 203, and a rectangular copper wire having a width of 1 mm and a thickness of 0.7 mm as the primary windings 201 and 202 is shown in FIG. Wind like so. At that time, the winding start (end portions 201a and 202a) of the primary windings 201 and 202 is pulled out substantially perpendicular to the longitudinal direction of the bobbin 204, and the winding end (end portions 201b and 202b) is extended from the bobbin 204 in the longitudinal direction of the bobbin 204. Fold it out about 90 degrees so that it extends. The ends of the primary windings 201 and 202 are respectively drawn out so as to protrude at least 3 mm from the outermost part of the core 205, and the tips (2 to 5 mm) are soldered to form the terminals of the primary windings 201 and 202.

  If the primary windings 201 and 202 are wound as shown in FIG. 2, the winding lengths of the primary windings 201 and 202 are substantially equal, and the difference in resistance between the two windings can be minimized. .

  Next, the core 205 is inserted into the through-hole of the bobbin 204 from both sides, and the polyester adhesive tape No. 31C made by Nitto Denko Corporation with 55 μm base material and 25 μm adhesive is stuck on the outer peripheral surface of the core 205 twice. Then, the core 205 is fixed and the transformer 101 is completed.

  Next, a method for mounting the transformer 101 created as described above on the substrate 102 will be described.

  As shown in FIG. 2, a notch 104 for placing the transformer 101 is provided in advance on the side end of the substrate 102. Transformer 101 has its terminals 202a, 202b, 206a, 206b located on one side (front surface in FIG. 2) side of substrate 102, and terminals 201a, 201b located on the other side (back side in FIG. 2) side of substrate 102. As shown in FIG. The terminals 202a and 202b are soldered to the electrodes (lands) 105 and 106 disposed on the surface of the corresponding substrate 102, and the terminals 201a and 201b are soldered to the electrodes (not shown) disposed on the back surface of the substrate 102. Attach. The terminals 206a and 206b of the secondary winding 203 are soldered to the electrodes 108 and 109 disposed on the surface of the substrate 102.

  Through the above operation, the terminals 201a and 202a of the transformer 101 are connected to the drains of different MOSFETs (HAT2164H manufactured by Hitachi, Ltd.) 107, respectively. However, the MOSFET 107 to which the terminal 201a is connected is on the back surface of the substrate 102 and is not shown. The terminals 206a and 206b of the transformer 101 are connected to the bridge diode 110 via a wiring pattern (not shown). The rectified output side of the bridge diode 110 is connected to the output terminal (or connector) 111 of the substrate 102 via a wiring pattern (not shown).

  Note that reference numeral 112 in FIG. 2 denotes a control circuit of the power conversion circuit, but its operation is not related to the essence of the present embodiment, and thus detailed description thereof is omitted. Also, the capacitors 706 and 711 for removing ripples and noises connected to the input and output terminals of the power converter 701 shown in FIG. 4 may be arranged on the board 102 or arranged outside the board 102. May be.

  Further, the electrode of the substrate 102 to which the terminals 201b and 202b are connected also serves as an input terminal, and is connected to the output terminal of a solar cell (solar cell module or solar cell) 703, whereby a solar power generation device is configured. FIG. 7 is a diagram showing a schematic configuration of a solar power generation device, which is disposed in proximity to a power conversion device 701 housed in an outer box and a solar cell 703, and mechanically connects them with an adhesive, for example. At that time, by configuring the power conversion device 701 using the substrate 102 on which the transformer 101 of the present embodiment is mounted, the distance over which the power conversion device 701 protrudes from the solar cell 703 can be made shorter than before, The area of the portion that does not contribute to power generation (the portion other than the solar cell in the area necessary for installing the solar power generation device) can be reduced.

  Thus, according to the substrate 102 having the transformer 101 and the cutout portion 104 in which the transformer 101 is disposed, the transformer 101 is not disposed on the substrate 102, so that the power conversion circuit is thin and has a small projected area, and A power conversion device 701 using the power conversion circuit can be provided. In particular, by pulling out part of the end of the primary winding that uses a thick wire in the longitudinal direction of the bobbin 204, the width of the substrate 102 (the vertical distance in FIG. 2) can be reduced, and power conversion In the case of a solar power generation device in which the device 701 is connected to the solar battery 103, the influence on the area conversion efficiency of the solar power generation device is reduced. Furthermore, the winding lengths of the primary windings 201 and 202 can be made substantially equal to minimize the difference in resistance value between the two windings.

  FIG. 8 is a diagram showing another configuration of the transformer. In addition to the transformer 101 shown in FIG. 3, the end portions 501a and 502a of the primary windings 501 and 502 are arranged in the longitudinal direction of the transformer 507 as shown in FIG. The end portions 501b and 502b can be drawn from a surface intersecting with the side surface along the longitudinal direction of the transformer 507. Here, the end portions 501a and 502b are formed on substantially the same surface, and the end portions 501b and 502a are also formed on substantially the same surface. By using such a transformer 507, the transformer 507 can be stably fixed to the substrate 102.

  Next, a transformer and a mounting substrate of Example 2 will be described. The same reference numerals are given to substantially the same configurations as in Example 1, and detailed description thereof will be omitted.

  FIG. 9 is a diagram showing an outline after assembling the transformer 607 of the second embodiment. Both ends of the secondary winding 603 are electrically connected to terminals 606a and 606b fixed to the bobbin 604. Further, the primary windings 601 and 602 each constitute 4 turns, and the secondary winding 603 constitutes a transformer 607 having a high step-up ratio (1: 200) with 800 turns. The materials used for the transformer 607 are the primary windings 601 and 602, the secondary winding 603, the bobbin 604, and the core 205 that are substantially the same as those in the first embodiment. The method is different.

[How to create a transformer]
As in the first embodiment, an EE12 type core manufactured by Hitachi Ferrite Electronics Co., Ltd. is used as the core 205. Solder one end of a type 1 polyurethane wire (1UEW) with a diameter of 0.08mm to the terminal 606a of the bobbin 604 suitable for this core, align the wire with the bobbin body of the bobbin 604 and wind it in multiple layers 800 times, The other end of this is soldered to the terminal 606b to form the secondary winding 603.

  Next, if necessary, an insulating tape is wound on the secondary winding 603, and two rectangular conductor wires 1 mm wide and 0.7 mm thick are arranged in parallel as the primary windings 601 and 602, as shown in FIG. Wind as shown in 9. At that time, the end portions 601a, 601b, 602a, and 602b of the primary winding are bent and pulled out by about 90 degrees so as to extend from the bobbin 604 in the longitudinal direction of the bobbin 604 as shown in FIG. At this time, the end portions 601a and 602a, 601b and 602b are arranged on the same plane, drawn out so as to protrude at least 3 mm from the outermost part of the core 205, and soldered at the tip (2 to 5mm) to make the primary winding 601 and 602 terminals are formed.

  Next, the core 205 is inserted into the through-hole of the bobbin 604 from both sides, and a polyester adhesive tape No. 31C made by Nitto Denko Co., Ltd. with 55 μm base material and 25 μm adhesive is stuck on the outer peripheral surface of the core 205 The core 205 is fixed to complete the transformer 607.

  FIG. 10 is a diagram illustrating a configuration example of the mounting board of the second embodiment. A method of mounting the transformer 607 created as described above on the board 1402 will be described with reference to FIG.

  As shown in FIG. 10, a notch 1403 for arranging the transformer 607 is provided in advance on the side end of the substrate 1402. Transformer 607 has its terminals 601b, 602b, 606a and 606b arranged on one side (the front surface in FIG. 10) side of substrate 1402, and terminals 601a and 602a on the other side (the back surface in FIG. 10) side. As shown in FIG. Then, the terminals 601b and 602b are soldered to electrodes (lands) 1404 and 1405 arranged on the surface of the corresponding substrate 1402, and the terminals 601a and 602a are soldered to electrodes (not shown) arranged on the back surface of the substrate 1402. Attach. The terminals 606a and 606b of the secondary winding 603 are soldered to electrodes 1406 and 1407 arranged on the surface of the substrate 1402.

  When the primary windings 601 and 602 are wound as shown in FIG. 10, the winding lengths and arrangements of the primary windings 601 and 602 are substantially equal, and the difference in resistance between the two windings is minimized. Also, the difference in leakage inductance can be minimized.

  Through the above operations, the terminals 601b and 602b of the transformer 607 are connected to the drains of different MOSFETs (Hitachi HAT2164H) 107, respectively. The terminals 606a and 606b of the transformer 607 are connected to the bridge diode 110 via a wiring pattern (not shown). The rectified output side of the bridge diode 110 is connected to the output terminal (or connector) 111 of the substrate 1402 via a wiring pattern (not shown).

  Note that reference numeral 112 in FIG. 10 denotes a control circuit of the power conversion circuit, but its operation is not related to the essence of the present embodiment, and thus detailed description thereof is omitted. Further, the capacitors 706 and 711 for removing ripples and noises connected to the input end and output end of the power conversion device 701 shown in FIG. 4 may be disposed on the substrate 1402 or disposed outside the substrate 1402. May be.

  Further, the electrode of the substrate 1402 to which the terminals 601a and 602a are connected also serves as an input terminal, and is connected to the output terminal of a solar cell (solar cell module or solar cell) 703 to constitute a solar power generation device.

  The configuration and operation of the above-described transformer 607, power conversion device 701 using the substrate 1402, and the solar power generation device to which the solar cell 703 and the load 716 are connected are substantially the same as those in the first embodiment. A description of the operation is omitted.

  As described above, according to the transformer 607 and the substrate 1402 having the notch 1403 on which the transformer 607 is disposed, the power conversion circuit that is thin and has a small projected area, and the power conversion circuit, as in the first embodiment. The power converter 701 used can be provided. In particular, by pulling out all the ends of the primary winding using thick wires in the longitudinal direction of the bobbin 604, the width of the substrate 1402 (the vertical distance in FIG. 9) can be reduced, so that the power conversion device In the case of the solar power generation device in which 701 is connected to the solar battery 103, the influence on the area conversion efficiency of the solar power generation device is reduced. Furthermore, the winding lengths and arrangements of the primary windings 601 and 602 are substantially equal, so that the difference in resistance between the two windings can be minimized and the difference in leakage inductance can be minimized.

  FIG. 12 is a diagram showing another configuration of the transformer. In addition to the transformer 607 shown in FIG. 9, the end portions 1201a and 1202b of the primary windings 1201 and 1202 as shown in FIG. It can be configured such that it is drawn out from the surface intersecting the side surface along the longitudinal direction, and the end portions 1201b and 1202a are pulled out from the surface facing the surface intersecting the side surface along the longitudinal direction of the transformer 1207. Here, the end portions 1201a and 1201b are formed on substantially the same surface, and the end portions 1202a and 1202b are also formed on substantially the same surface. By using such a transformer 1207, the transformer 1207 can be stably fixed to the substrate 1402.

  In the embodiment described above, the push-pull circuit has been described as the power conversion circuit. However, the present embodiment is not limited to the push-pull transformer, but can be applied to transformers for other systems and their implementation. FIG. 4 shows a configuration in which the power converter 715 and one load 716 are connected. As shown in FIG. 11, a plurality of power converters 715 connected to the solar cells 703 are connected in parallel. The solar power generation system connected to the commercial power system 802 can be configured by supplying the DC output to the grid-connected inverter 801, converting the DC power output from the solar cell into AC power.

  According to the embodiment described above, by providing the component mounting electrodes on both surfaces of the substrate, the two terminals of the electronic component mounted on the substrate can be arranged symmetrically with the substrate interposed therebetween. In addition, a notch for arranging the components is provided on the side of the board, and the electronic component having the two terminals described above is fitted into the notch, and the power converter is minimized by minimizing the gap generated between the transformer and the board. Small and thin. This is because a terminal drawn from the transformer and electrically connected to the electrode (or terminal) of the substrate does not need to pass through the gap between the transformer and the substrate.

  Further, even when the number of turns of the primary winding of the transformer is small, the lead position of the primary winding can be stably formed.

  In the case of a transformer for a push-pull circuit, the difference in the length of the primary winding accompanying the drawing of the primary winding is achieved by arranging the drawing directions of the two primary windings symmetrically on the front and back surfaces of the board. Can be prevented from occurring. As a result, even when the number of turns of the primary winding is small, the difference in resistance value of the primary winding can be minimized. Furthermore, by pulling out one end of each primary winding of the transformer for push-pull circuit in the winding direction, the dimension of the transformer in the direction crossing the winding direction can be reduced, the board can be downsized and the power Miniaturization of the converter can be realized. Furthermore, if all the ends of the windings of the transformer for the push-pull circuit are pulled out in the winding direction, the dimensions of the transformer in the direction crossing the winding direction can be minimized, and the substrate and power The converter can be downsized.

  Moreover, if the above power converter is combined with a solar cell to form a solar power generation device, the area where the power converter protrudes from the solar power generation device is reduced, and the effect on the area conversion efficiency of the solar power generation device is reduced. can do.

The figure which shows the structural example of the transformer for push pull circuits, The figure which shows the structural example of the mounting board of Example 1, An exploded perspective view of a transformer used in Example 1, The circuit diagram which shows the structural example of a power converter device, The figure which shows the outline after assembling the transformer, Side view of transformer after assembly, The figure which shows schematic structure of a solar power generation device, A diagram showing another configuration of the transformer, The figure which shows the outline after assembling the transformer of Example 2, The figure which shows the example of a structure of the mounting board of Example 2, A block diagram illustrating a configuration example of a photovoltaic power generation system including a plurality of power conversion devices connected in parallel and including a grid-connected inverter, It is a figure which shows another structure of a transformer.

Claims (16)

A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a winding whose both ends form a first terminal disposed on the first side surface of the transformer and a second terminal disposed on the second side surface intersecting the first side surface. Have
The first and second terminals are electrically connected to one surface of the circuit board, respectively. A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a first winding whose both ends form a first terminal disposed on a first side surface of the transformer and a second terminal disposed on a second side surface intersecting the side surface, And both ends thereof have a second winding forming a third terminal disposed on the third side facing the first side and a fourth terminal disposed on the second side. And
The first and second terminals are electrically connected to one surface of the circuit board, and the third and fourth terminals are electrically connected to the other surface of the circuit board, respectively. . A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a winding whose both ends form a first terminal disposed on the first side surface of the transformer and a second terminal disposed on the second side surface intersecting the first side surface. Have
The power converter, wherein the first terminal is electrically connected to one surface of the circuit board, and the second terminal is electrically connected to the other surface of the circuit board. A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a first winding whose both ends form a first terminal disposed on a first side surface of the transformer and a second terminal disposed on a second side surface intersecting the side surface, And both ends thereof have a second winding forming a third terminal disposed on the third side facing the first side and a fourth terminal disposed on the second side. And
The power converter, wherein the first and third terminals are electrically connected to one surface of the circuit board, and the second and fourth terminals are electrically connected to the other surface of the circuit board, respectively. .   5. The method according to claim 1, wherein the first side surface is a side surface intersecting with a longitudinal direction of the transformer, and the second side surface is a side surface along the longitudinal direction. Power converter.   6. The power conversion device according to claim 5, wherein the terminal disposed on the side surface intersecting the longitudinal direction is formed by bending the winding about 90 degrees with respect to a winding direction thereof. A circuit board having a notch, and a transformer disposed in the notch,
The transformer has windings whose ends form a first terminal disposed on the first side surface of the transformer and a second terminal disposed on the second side surface opposite to the first side surface. Have
The power converter, wherein the first terminal is electrically connected to one surface of the circuit board, and the second terminal is electrically connected to the other surface of the circuit board. A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a first terminal whose both ends form a first terminal disposed on a first side surface of the transformer and a second terminal disposed on a second side surface opposite to the first side surface. A winding, as well as a second winding whose ends form a third terminal located on the first side and a fourth terminal located on the second side;
The power converter, wherein the first and third terminals are electrically connected to one surface of the circuit board, and the second and fourth terminals are electrically connected to the other surface of the circuit board, respectively. . A circuit board having a notch, and a transformer disposed in the notch,
The transformer has windings whose both ends form a first terminal disposed on the first side surface of the transformer and a second terminal disposed on the second side surface opposite to the first side surface. Have
The first and second terminals are electrically connected to one surface of the circuit board, respectively. A circuit board having a notch, and a transformer disposed in the notch,
The transformer has a first terminal whose both ends form a first terminal disposed on a first side surface of the transformer and a second terminal disposed on a second side surface opposite to the first side surface. A winding, as well as a second winding whose ends form a third terminal located on the first side and a fourth terminal located on the second side;
The first and second terminals are electrically connected to one surface of the circuit board, and the third and fourth terminals are electrically connected to the other surface of the circuit board, respectively. .   11. The power converter according to claim 7, wherein the first and second side surfaces are surfaces intersecting with a longitudinal direction of the transformer.   12. The power conversion device according to claim 11, wherein the terminal is formed by bending the winding about 90 degrees with respect to a winding direction thereof.   13. The power converter according to claim 1, wherein the wire of the winding is a flat copper wire.   14. The power converter according to claim 1, wherein the transformer is a transformer for a push-pull circuit. A power converter according to any one of claims 1 to 14,
A solar power generation apparatus comprising: a solar battery that supplies direct-current power to the power converter.   16. The solar power generation device according to claim 15, further comprising an inverter that converts DC power output from the power converter into AC power.

Images