Power conversion device

Abstract

Power conversion device comprising: a circuit board (20) on which a plurality of semiconductor elements forming a power conversion circuit are mounted; a main body housing (10) accommodating the circuit board (20); a mounting unit of an input connector (31) that supplies power to the power conversion circuit, and a mounting unit (32a) of an output connector (32) that outputs power converted in the power conversion circuit, the mounting units being provided on a bottom surface (10c) or a top surface of the main body housing (10); a recessed portion (11) formed on a front surface (10a) or a side surface of the main body case (10), wherein a mounting unit (33a) of an auxiliary connector for the output (33) connected in parallel to the connector for the output (32) to the power conversion circuit is provided; and a double-sided mounting type wiring board (30) electrically connected to the circuit board (20), having one mounting surface (30b) on which the mounting unit of the input connector (31) or the mounting unit (32a) of the output connector (32) is mounted, and the other mounting surface (30a) on which the mounting unit (33a) of the auxiliary output connector (33) is arranged, and which is arranged in the main body housing (10) in a position where the other mounting surface (30a) is arranged parallel to the front side (10a) of the main body housing (10).

Description

Technical area

[0001] The present invention relates to power conversion devices that convert input power into desired power and output the converted power. General state of the art

[0002] A configuration including a converter circuit that converts AC input power into DC power and an inverter circuit that converts the DC power converted in the converter circuit into AC power is a common device of power conversion devices of this type. The converter circuit and the inverter circuit are formed on a circuit board housed inside a main body case, are connected to an external power source, such as a commercial power source, via three-phase input terminals, and are connected to a load, such as a motor, via three-phase output terminals. The input terminals and output terminals are provided as connectors, and their contact units protrude from the main body case to form cables and can be connected to the cables from outside the main body case (see, for example, Patent Literature 1).

[0003] Typically, the input connector and output connector are provided on the top and bottom of the main body casing to reduce installation space. That is, if the input connector and output connector are provided on the top and bottom of the main body casing, the contact units for the cables, the outwardly projecting contact units, are arranged in a protrusion region of the main body casing, and thus the power conversion device can be installed without requiring much space around it. Citation listPatent literature

[0004] Patent Literature 1: Japanese Patent Laid-Open Publication JP 2012 - 139 012 A Brief description of the inventionTechnical problem

[0005] In the power conversion device described above, an additional arrangement of an output connector is desirable. For example, power conversion devices that output AC power to synchronous motors that drive cars to move the cars up and down in elevator systems include those that control the moving speed of the cars by short-circuiting the output terminals, thereby causing the synchronous motors to decelerate. In such a power conversion device, if an auxiliary output connector is additionally arranged separately from an output connector connected to a synchronous motor, while simultaneously connecting the synchronous motor to the output connector, a switching means can be easily connected to the additional auxiliary output connector.

[0006] Since an input connector and an output connector are already provided on a top and bottom surface of the main body casing, it is difficult to create space for another output connector. Furthermore, if an output connector is provided on a peripheral surface, such as a front or side surface of the main body casing as described above, space must be created around it to avoid interference with the protruding output connector, which severely limits the installation location.

[0007] In view of the circumstances described above, it is an object of the present invention to provide a power conversion device which allows a connector for the output to be additionally arranged without greatly limiting the possibilities for an installation location. Solution to the problem

[0008] To achieve the above object, a power conversion device according to the present invention includes: a circuit board (or board) on which a plurality of semiconductor elements constituting a power conversion circuit are mounted; a main body case accommodating the circuit board; a mounting unit of an input connector that supplies power to the power conversion circuit and a mounting unit of an output connector that outputs power converted in the power conversion circuit, the mounting units being provided on a bottom surface or a top surface of the main body case; and an auxiliary connector mounting unit provided outside the main body case and connected to the power conversion circuit.Further, a recessed portion is formed on a peripheral surface of the main body case, and the mounting unit of the auxiliary connector is provided on an inner bottom surface of the recessed portion.

[0009] Furthermore, in the above-described power conversion device according to the present invention, a wiring board (or circuit board) is arranged inside the main body case in a position where a mounting surface of the wiring board is parallel to a front side of the main body case, and the recessed portion is formed on the front side of the main body case, and the mounting unit of the auxiliary connector is arranged on a front side of the wiring board in a part corresponding to the recessed portion of the main body case.

[0010] Furthermore, in the above-described power conversion device according to the present invention, the wiring board is of the double-side mounting type, and the mounting unit of the connector for input or the mounting unit of the connector for output is arranged on a back side of the wiring board.

[0011] Furthermore, in the above-described power conversion device according to the present invention, the auxiliary connector is an auxiliary connector for output connected in parallel to the connector for output, and the mounting unit of the connector for output is arranged on the back side of the wiring board.

[0012] Furthermore, in the above-described power conversion device according to the present invention, the auxiliary connector mounting unit and the output connector mounting unit are arranged at positions corresponding to both sides of the wiring board.

[0013] Furthermore, in the above-described power conversion device according to the present invention, the auxiliary connector is a straight type connector, and the connector for the output is a 90° type connector.

[0014] Furthermore, in the above-described power conversion device according to the present invention, the circuit board is arranged inside the main body case in parallel with the wiring board.

[0015] Furthermore, in the above-described power conversion device according to the present invention, a height of the recessed portion from the inner bottom surface is such that when a contact unit connected to a cable is attached to the mounting unit of the auxiliary connector and the cable is bent along the inner bottom surface of the recessed portion, the cable does not protrude from a front side of the main body case. Benefits of the invention

[0016] According to the present invention, since the recessed portion is formed on the peripheral surface, such as the front or side surface, of the main body casing, and the auxiliary connector is arranged to protrude outward from the inner bottom surface of this recessed portion, the amount of protrusion of the auxiliary connector from the peripheral surface of the main body casing is reduced by the height of the recessed portion. Therefore, a power conversion device additionally provided with an auxiliary connector can be installed without requiring space around it. Short description of the drawings Fig. 1 is a perspective view illustrating an external appearance of a power conversion device which is an embodiment of the present invention. Fig. 2 is a transparent perspective view showing arrangement positions of a wiring board, a connector for output and an auxiliary connector for output relative to a main body case of the Fig. 1 illustrated power conversion device. Fig. 3 is a bottom view of the Fig. 1 illustrated power conversion device. Fig. 4 is a circuit diagram of the Fig. 1 illustrated power conversion device. Description of embodiments

[0017] Hereinafter, a preferred embodiment of a power conversion device according to the present invention will be described in detail with reference to the accompanying drawings.

[0018] Fig. Figure 1 illustrates a power conversion device that is an embodiment of the present invention. The power conversion device illustrated herein as an example outputs AC power to a synchronous motor M that drives a car to move the car up and down, for example, in an elevator system, and includes, as shown in Fig. 4 illustrates a converter circuit 1 that converts AC input power into DC power, and an inverter circuit 2 that converts the DC power converted in the converter circuit 1 into AC power. Semiconductor elements constituting this converter circuit 1 and this inverter circuit 2 are, as shown in Fig. 2, mounted on a circuit board 20 which is housed inside a main body housing 10. The circuit board 20 is, as shown in Fig. 2, supported in the main body housing 10 in a position in which a mounting surface of the circuit board 20 is parallel to a front side 10a of the main body housing 10.

[0019] Inside the main body case 10, a wiring board 30 for connection is arranged in parallel with the printed circuit board 20. The wiring board 30 is of a double-sided mounting type, in which both a front side 30a opposite the front side 10a of the main body case 10 and a rear side 30b opposite a rear side 10b of the main body case 10 are mounting surfaces, and is electrically connected to the printed circuit board 20 via a terminal connector (not illustrated).

[0020] In this wiring board 30 there is a connector for the input 31 (see Fig. 4), a connector for the output 32 and an auxiliary connector for the output 33 are provided. The connector for the input 31 is, as in Fig. 4 illustrates an input interface for supplying AC power supplied from an external power source, such as a commercial power source, to the converter circuit 1, and includes input terminals of three phases: R, S, and T. The output connector 32 is an output interface for supplying AC power output from the inverter circuit 2 to a load, such as the synchronous motor M, and includes output terminals of three phases: U, V, and W. The auxiliary output connector 33 is an output interface that, similar to the output connector 32, includes output terminals of three phases: U, V, and W, and is connected to the inverter circuit 2 in parallel with the output connector 32.

[0021] The connector for output 32 and the auxiliary connector for output 33 each contain, as shown in Fig. 2 illustrates mounting units 32a and 33a and contact units 32b and 33b that can be separated from each other. The mounting units 32a and 33a are units mounted on the wiring board 30, and the contact units 32b and 33b are sections to which cables C are connected, as shown in Fig. 1. The output connector 32 and the auxiliary output connector 33 are configured such that the contact units 32b and 33b with the cables C protrude outside the main body casing 10, and the cables C can be connected to the respective U-phase, V-phase, and W-phase output terminals from outside the main body casing 10.

[0022] In this embodiment, as in Fig. As illustrated in Fig. 2, the output connector 32 is mounted on the rear side 30b of the wiring board 30, and the auxiliary output connector 33 is mounted on the front side 30a of the wiring board 30. The output connector 32 is of a 90° type, and the contact unit 32b protrudes downward from a lower end portion of the rear side 30b of the wiring board 30 so as to protrude outward from a bottom side 10c of the main body case 10. The auxiliary output connector 33 is of a straight type, and the contact unit 33b protrudes forward from a lower end portion of the front side 30a of the wiring board 30 so as to protrude outward from the front side 10a of the main body case 10.In the wiring board 30, each of the output connector 32 and the auxiliary output connector 33 is mounted on a portion corresponding to a lower right corner portion of the main body case 10 when viewed from the front. Therefore, an overall length of a connecting wiring structure formed from the inverter circuit 2 to the output connector 32 and the auxiliary output connector 33 can be shortened.

[0023] As in Fig. 1 and Fig. As illustrated in Figure 2, the bottom surface 10c of the main body housing 10, the bottom surface 10c from which the contact unit 32b of the connector for the output 32 protrudes, is formed in a substantially flat shape. In contrast, on the front surface 10a of the main body housing 10, the front surface 10a from which the contact unit 33b of the auxiliary connector for the output 33 protrudes, a recessed portion 11 is formed in an edge portion located on a right side when viewed from the front. The recessed portion 11 is, as shown in Fig. 1 and Fig. 3, is formed such that its inner bottom surface 11a is located one step lower toward the rear side 10b than the front side 10a of the main body case 10, and is formed to be open to each of a top side, a bottom side, and a right side of the main body case 10. In this embodiment, the recessed portion 11 is formed such that, when the contact unit 33b is connected to the mounting unit 33a of the auxiliary connector for the output 33, the recessed portion 11 has a height greater than a distance from the inner bottom surface 11a of the recessed portion 11 to a protruding end of the contact unit 33b. More specifically, as shown in Fig. 3, the height from the inner bottom surface of the recessed portion 11 to the front surface 10a of the main body case 10 is set to such a height that when the contact unit 33b connected to the cables C is attached to the mounting unit 33a of the auxiliary connector for output 33 and the cables C are arranged along an up-down direction in the recessed portion 11 or are arranged to be bent to the right, the cables C do not protrude from the front surface 10a of the main body case 10.

[0024] Although not clearly illustrated in the drawings, the connector for the input 31 is formed so that its contact unit protrudes from a top surface of the main body housing 10. Furthermore, a reference numeral 40 in Fig. 1 of a cooling unit arranged on the rear side 10b of the main body housing 10. The cooling unit 40 serves to cool a heat-generating module (semiconductor element), such as an IGBT or a capacitor.

[0025] Since in the power conversion device configured as described above, the auxiliary connector for the output 33 is arranged at a position independent of the connector for the output 32, as shown in Fig. As illustrated in Figure 4, even in a state where the cables C of the synchronous motor M are connected to the output connector 32, the cables C of a switching means S can be easily connected to the respective output terminals of the auxiliary output connector 33. Thus, a braking effect is exerted on the synchronous motor M by short-circuiting the output terminals, and the moving speed of the car can be controlled.

[0026] Furthermore, since the input connector 31 is arranged on the upper side of the main body housing 10 and the output connector 32 is arranged on the lower side 10c of the main body housing 10, the contact unit of the input connector 31 and the contact unit 32b of the output connector 32—or the cables C connected thereto—do not protrude peripherally, such as forwardly or laterally, from the main body housing 10. Furthermore, since the auxiliary output connector 33 is formed to protrude outwardly from the inner bottom surface 11a of the recessed portion 11 arranged on the front side 10a of the main body housing 10, as shown in Fig.3, the contact unit 33b or the connected cables C do not protrude beyond the peripheral edge of the main body casing 10. As a result, a power conversion device additionally provided with the auxiliary output connector 33 can be installed without having to keep space around it.

[0027] In the above-described embodiment, since the output connector 32 is mounted on the rear side 30b of the wiring board 30, while the auxiliary output connector 33 is mounted on the front side 30a of the wiring board 30, the lengths of wiring structures between the respective mounting units 32a and 33a and the inverter circuit 2 can be significantly reduced, and the wiring board 30 and the main body case 10 can be downsized. However, the manner of mounting the output connector 32 and the auxiliary output connector 33 on the wiring board 30 is not limited to that of this embodiment.

[0028] Furthermore, although the recessed portion 11 and the auxiliary output connector 33 are arranged on the front surface 10a of the main body case 10 in the above-described embodiment, they may be configured such that the recessed portion 11 is arranged on the side surface of the main body case 10 and the auxiliary output connector 33 is arranged on the inner bottom surface 11a of this recessed portion 11. The recessed portion 11 arranged in the peripheral edge of the main body case 10 is not necessarily formed over the entire length of a part from the top end to the bottom end, and only needs to have a size in which the auxiliary output connector 33 can be arranged.

[0029] Moreover, in the above-described embodiment, the switching means S for short-circuiting the output terminals is connected to the auxiliary connector for the output 33, but the use of the auxiliary connector for the output 33 is not limited thereto.

[0030] Furthermore, the above-described embodiment relates to the auxiliary connector for the output 33 connected in parallel with the connector for the output 32, but an auxiliary connector for the input may also be connected in parallel with the connector for the input 31, or an auxiliary connector for DC power arranged in a DC link of the power conversion device may be provided. List of reference symbols 1 TRANSFORMER CIRCUIT 2 INVERTER CIRCUIT 10 MAIN BODY HOUSING 10a FRONT 11 RECESSED SECTION 11a INNER FLOOR AREA 30 WIRING BOARD 30a FRONT 30b BACK 32 CONNECTORS FOR THE OUTPUT 32a ASSEMBLY UNIT 32b CONTACT UNIT 33 AUXILIARY CONNECTORS FOR THE OUTPUT 33a ASSEMBLY UNIT 33b CONTACT UNIT

Claims

[1] Power conversion device comprising: a circuit board (20) on which a plurality of semiconductor elements forming a power conversion circuit are mounted; a main body housing (10) accommodating the circuit board (20); a mounting unit of an input connector (31) that supplies power to the power conversion circuit, and a mounting unit (32a) of an output connector (32) that outputs power converted in the power conversion circuit, the mounting units being provided on a bottom surface (10c) or a top surface of the main body housing (10); a recessed portion (11) formed on a front surface (10a) or a side surface of the main body case (10), wherein a mounting unit (33a) of an auxiliary connector for the output (33) connected in parallel to the connector for the output (32) to the power conversion circuit is provided; and a double-sided mounting type wiring board (30) electrically connected to the circuit board (20), having one mounting surface (30b) on which the mounting unit of the input connector (31) or the mounting unit (32a) of the output connector (32) is mounted, and the other mounting surface (30a) on which the mounting unit (33a) of the auxiliary output connector (33) is arranged, and which is arranged in the main body housing (10) in a position where the other mounting surface (30a) is arranged parallel to the front side (10a) of the main body housing (10). [2] The power conversion device according to claim 1, wherein the mounting unit (33a) of the auxiliary connector for the output (33) and the mounting unit (32a) of the connector for the output (32) are arranged at positions corresponding to both sides of the wiring board (30). [3] A power conversion device according to claim 1 or claim 2, wherein the auxiliary connector for the output (33) is a straight type connector and the connector for the output (32) is a 90° type connector. [4] The power conversion device according to any one of claims 1 to 3, wherein the circuit board (20) is arranged inside the main body case (10) in parallel to the wiring board (30). [5] The power conversion device according to claim 1, wherein a height of the recessed portion (11) from the inner bottom surface (11a) is such a height that when a contact unit connected to a cable is attached to the mounting unit (33a) of the auxiliary connector for output (33) and the cable is bent along the inner bottom surface (11a) of the recessed portion (11), the cable does not protrude from a front side (10a) of the main body case (10).

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