JP2015130767A - Electric power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power conversion system capable of ensuring current capacity and voltage resistance.SOLUTION: An electronic component 2 constitutes a power conversion circuit 20. The electronic component 2 is mounted on the a first conductive plate 3. A second conductive plate 4 includes a first terminal block 41 and a second terminal block 42 which are connected to the power conversion circuit 20. A resin structure member 5 is formed integrally with the first conductive plate 3 and second conductive plate 4.

Description

  The present invention relates to a power conversion device to which an external power source such as a solar battery or a storage battery is connected.

  Conventionally, in a power supply system using a plurality of solar cell modules as an external power source, a connection box and a power conditioner are provided between the solar cell module and the distribution board (for example, see Patent Document 1). The junction box is responsible for collecting the output of each solar cell module. The power conditioner includes a DC-DC converter circuit that converts the output of the solar cell module into DC power suitable for the inverter circuit, and an inverter circuit that converts the DC output of the DC-DC converter circuit to AC.

JP 2012-168699 A

  Since a relatively large current flows and a relatively high voltage is applied to the DC-DC converter circuit, it is necessary to ensure current capacity and withstand voltage. However, when a DC-DC converter circuit is configured by mounting electronic components on a printed circuit board, it is difficult to ensure current capacity and withstand voltage.

  This invention is made | formed in view of the said reason, The objective is to provide the power converter device which can ensure a current capacity | capacitance and a withstand voltage.

  The power conversion device according to the present invention is a second conductive material in which an electronic component constituting a power conversion circuit, a first conductive plate on which the electronic component is mounted, and a terminal block connected to the power conversion circuit are formed. And a structure made of resin formed integrally with the first conductive plate and the second conductive plate.

  In this power conversion device, as the terminal block, a first terminal block to which an external power source that performs at least one of generation and storage of DC power is connected, and a second terminal block to which an external device is connected are provided. It is preferable that a switch electrically connected between the first terminal block and the power conversion circuit is provided.

  In this power conversion device, it is preferable to include a noise prevention filter electrically connected between the first conductive plate and the second conductive plate.

  As described above, in the present invention, since the electronic components constituting the power conversion circuit are mounted on the first conductive plate and the terminal block is formed on the second conductive plate, current capacity and withstand voltage are ensured. There is an effect that can be.

It is an external view of the principal part of the power converter device in embodiment of this invention, (a) is a front view, (b) is a rear view. It is an external appearance front view of the DC connection box incorporating the power converter in the embodiment of the present invention. It is an external view of the power converter device in embodiment of this invention, (a) is a front view, (b) is a side view. It is an external view of the principal part of the power converter device in embodiment of this invention, (a) is a front view, (b) is a side view. It is a longitudinal cross-sectional view of the principal part of the power converter device in embodiment of this invention. It is a block block diagram of the electric power supply system in embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
The power converter 1 of this embodiment is used for the power supply system which used the solar cell module 10 as the external power supply, for example (refer FIG. 6). This power supply system includes a solar cell module 10, a DC connection box 11, and an inverter circuit 12. And the solar cell module using the power converter circuit 20 (DC-DC converter circuit) with which the power converter device 1 provided in the DC connection box 11 is provided, and the inverter circuit 12 provided in the exterior of the DC connection box 11 is used. The DC power generated by 10 is converted and output to the system output and the independent output.

  The output of each solar cell module 10 is connected to the DC connection box 11. The DC connection box 11 includes the number of power conversion devices 1 corresponding to the number of solar cell modules 10, and one solar cell module 10 is connected to one power conversion device 1. In the example of the power supply system illustrated in FIG. 6, two solar cell modules 10 and two power conversion devices 1 are illustrated. The power conversion device 1 is housed in a DC connection box 11 and includes a power conversion circuit 20 (DC-DC converter circuit) that converts the DC output of the solar cell module 10 into DC power suitable for the inverter circuit 12. Yes. Further, the DC connection box 11 includes a connection unit 111 that collects the output of each power conversion device 1, and the outputs of each power conversion device 1 are combined into one and output to the inverter circuit 12. The inverter circuit 12 converts the output of the DC junction box 11 into AC power, and outputs it to a system output linked to the commercial power system and a self-sustained output that allows the load to operate independently.

  Below, the structure of the power converter device 1 of this embodiment is demonstrated using FIGS. The power conversion device 1 of the present embodiment includes an electronic component 2, a first conductive plate 3, a second conductive plate 4, and a structure 5. The electronic component 2 constitutes a power conversion circuit 20. The electronic component 2 is mounted on the first conductive plate 3. The second conductive plate 4 is formed with a first terminal block 41 and a second terminal block 42 connected to the power conversion circuit 20. The structure 5 is made of a resin formed integrally with the first conductive plate 3 and the second conductive plate 4.

  As shown in FIG. 2, the power conversion device 1 of the present embodiment is arranged in a line in the casing 110 of the DC connection box 11, and the output of each power conversion device 1 is connected via a bus bar 112. Connected to the unit 111. That is, the power conversion device 1 is handled as an internal unit of the DC connection box 11.

  FIG. 3A shows an external front view of the power converter 1, FIG. 3B shows an external side view of the power converter 1, and FIG. 3C shows an external bottom view of the power converter 1. The power conversion device 1 includes a rectangular parallelepiped case 6, and a power conversion circuit 20 is provided inside the case 6.

  FIG. 4A shows an external front view of the power converter 1 with the case 6 removed, and FIG. 4B shows an external side view of the power converter 1 with the case 6 removed. The case 6 accommodates a rectangular plate-shaped printed circuit board 7 and a rectangular plate-shaped insert molded product 8 disposed on the back side of the printed circuit board 7. The power conversion circuit 20 is configured by the electronic component 2 mounted on the board.

  A plurality of electronic components 2 including a plurality of electrolytic capacitors 211 are mounted on the front surface of the printed circuit board 7, and a switching module 22 and a heat sink 23 provided so as to contact the switching module 22 are mounted on the back surface. The heat sink 23 is configured such that the heat radiating portion is exposed from the case 6, and improves the heat dissipation of the switching module 22.

  FIG. 1A shows a front view of the insert molded product 8 and FIG. 1B shows a rear view of the insert molded product 8. The insert molded product 8 is configured by insert-molding the first conductive plate 3 and the second conductive plate 4 with a structure 5 made of resin.

  The first conductive plate 3 is composed of a plurality of metal plates arranged on the same plane, and electrically connects the plurality of electronic components 2 constituting the power conversion circuit 20. As an example of the electronic component 2, an electrolytic capacitor 211, a film capacitor 212, a ceramic capacitor 213, a booster coil 24, an inductor 25, a noise prevention (normal mode noise reduction) filter 26, and the like are mounted on the first conductive plate 3. ing. These electronic components 2 are mounted on the back side of the first conductive plate 3 by welding, soldering, caulking, or the like.

  A plurality of terminals 31 protruding from the structure 5 are formed by bending a part of the first conductive plate 3, and the terminals 31 are soldered to the printed circuit board 7 (see FIG. 5). ). Thereby, the electronic component 2 mounted on the printed circuit board 7 and the electronic component 2 mounted on the first conductive plate 3 are electrically connected to form the power conversion circuit 20. Note that electronic components 2 (for example, resistors, diodes, etc.) other than those described above are also mounted on the printed circuit board 7 and the first conductive plate 3.

  The second conductive plate 4 is composed of five metal plates arranged on the same plane, and a part of each of the second conductive plate 4 protrudes from the longitudinal end of the structure 5 so that the first terminal block 41 is provided. And the 2nd terminal block 42 is formed. The first terminal block 41 is composed of a pair of screw-type terminals 411 arranged in a line, functions as an input terminal of the power conversion circuit 20, and is connected to the sun via a cable (not shown). The battery module 10 is connected. The second terminal block 42 includes three screw-type terminals 421 provided in a line. Of the three terminals 421 included in the second terminal block 42, two terminals 421 function as output terminals of the power conversion circuit 20, and are connected to the inverter circuit 12 (see FIG. 6) that is an external device via the connection unit 111. The remaining one terminal 421 functions as a ground terminal and is grounded.

  Further, for noise prevention (for reducing common mode noise) electrically connected between the first conductive plate 3 and the second conductive plate 4 (first terminal block 41, second terminal block 42). Filters 271 and 272 are provided. Between each terminal 411 of the first terminal block 41 functioning as an input terminal of the power conversion circuit 20 and the first conductive plate 3, a coiled two-pole filter 271 in which a conductive wire is wound around a ferrite is bridged. To be connected. Further, between each terminal 421 of the second terminal block 42 functioning as an output terminal and a ground terminal of the power conversion circuit 20 and the first conductive plate 3, a coil-like structure in which a conductive wire is wound around ferrite is provided. A three-pole filter 272 is connected so as to bridge.

  In addition, the power conversion device 1 of this embodiment includes a switch 28 that is electrically connected between the first terminal block 41 and the power conversion circuit 20. Specifically, the switch 28 is mounted on the first conductive plate 3 at the subsequent stage of the filter 271 and conducts or cuts off the input path of the power conversion circuit 20 by a handle operation. Note that the switch 28 may have a function as an earth leakage breaker.

  As described above, the power conversion device 1 according to the present embodiment includes the first conductive plate 3 on which the electronic component 2 constituting a part of the power conversion circuit 20 is mounted, and the first and second terminal blocks 41 and 42. The second conductive plate 4 formed with is formed integrally with the structure 5 by insert molding. Since the first and second conductive plates 3 and 4 are made of metal plates, current capacity and withstand voltage can be ensured in a smaller space than the wiring of the printed circuit board, and heat dissipation is improved. Therefore, it is possible to reduce the size of the power conversion device 1 as compared with the case where the power conversion circuit 20 is configured by only a printed board. Further, since the first and second conductive plates 3 and 4 are insert-molded in the structure 5 made of resin, the insulation distance can be freely set and the insulation can be easily ensured. .

  In the present embodiment, the first conductive plate 3 and the second conductive plate 4 (first and second terminal blocks 41 and 42) are electrically connected using the filters 271 and 272. It is configured. Therefore, cables and connectors for connecting the first and second terminal blocks 41 and 42 and the power conversion circuit 20 are not necessary, and the number of parts can be reduced. Further, as shown in FIG. 5, the first conductive plate 3 and the second conductive plate 4 can be configured to have different thicknesses, and the current capacity and the withstand voltage can be easily designed. In the present embodiment, the thickness t1 of the first conductive plate 3 is 1 mm, and the thickness t2 of the second conductive plate 4 is 2 mm.

  In addition, the external power supply connected to the power converter device 1 of this embodiment is not limited to the solar cell module 10. The external power source only needs to be configured to generate at least one of direct-current power generation and storage, and may be configured, for example, from a storage battery. The external device connected to the output of the power conversion device 1 is not limited to the inverter circuit 12. For example, the external device may be composed of a DC device that is driven by DC power.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Electronic component 20 Power conversion circuit 271,272 Filter 28 Switch 3 1st conductive board 4 2nd conductive board 41 1st terminal block 42 2nd terminal block 5 Structure

Claims (3)

Electronic components constituting the power conversion circuit;
A first conductive plate on which the electronic component is mounted;
A second conductive plate formed with a terminal block connected to the power conversion circuit;
A power conversion device comprising: the first conductive plate and a structure made of a resin formed integrally with the second conductive plate. As the terminal block, a first terminal block to which an external power source that performs at least one of generation and storage of DC power is connected, and a second terminal block to which an external device is connected are provided,
The power converter according to claim 1, further comprising: a switch electrically connected between the first terminal block and the power conversion circuit. The power conversion apparatus according to claim 1, further comprising a noise prevention filter electrically connected between the first conductive plate and the second conductive plate.

Images