JP6137280B2 - Power converter - Google Patents

Description

  The present disclosure relates to a power conversion device.

  Patent Document 1 discloses an inverter device installed in a pump control panel.

Japanese Patent Laid-Open No. 11-225498

  A power conversion device such as the inverter device is required to have versatility that can be flexibly adapted to the installation location. An object of this indication is to provide a power converter device with high versatility.

  The power conversion device according to the present disclosure is arranged at a position distant from the filter element disposed on the circuit board and the circuit board, and switches between the conductive structural member and the filter element between a conductive state and a non-conductive state. A first bus bar that electrically connects the filter element and the switching unit, and a second bus bar that electrically connects the switching unit and the conductive structural member.

  According to the present disclosure, a highly versatile power conversion device can be provided.

It is a perspective view of a power converter. It is a disassembled perspective view of a power converter device. It is a perspective view from another direction of a power converter device. It is a typical circuit diagram of a power converter. It is a perspective view of a switch part periphery. It is a disassembled perspective view of the switching part of FIG. It is a schematic diagram which shows arrangement | positioning of a switching part. It is a schematic diagram which shows arrangement | positioning of a switching part. It is sectional drawing which shows the relationship between a switching part and opening.

  Hereinafter, embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description is omitted.

  The power conversion device 1 according to the present embodiment converts AC power (for example, commercial three-phase AC power) or DC power into AC power having a desired frequency (for example, three-phase AC power) and outputs the converted power. The power converter 1 is used, for example, in a control system for industrial equipment.

1. First, a specific configuration of the power conversion device 1 is illustrated with reference to FIGS. 1 to 3. In the following description, “up and down” means up and down in a standard installation state. “Front / Right / Left / Right” means a direction in which an operation panel (described later) side is a front side and the opposite side is a rear side. In the drawing, the Z-axis positive direction is upward, and the X-axis positive direction is forward.

  The power conversion apparatus 1 has a main body 2 that incorporates a circuit board 5 for power conversion. The main body 2 may have a first portion 3 and a second portion 4 that are adjacent to each other, and the circuit board 5 may be accommodated in the second portion 4. The first part 3 may be used for cooling circuit elements of the circuit board 5.

  More specifically, the main body 2 has a housing 10. The housing 10 has a first space S1 in which the circuit board 5 is disposed and a second space S2 including a cooling fluid flow path FP1. For example, the housing 10 includes a base housing 20, a first cover 50, and a second cover 60 as shown in FIG.

  The base housing 20 includes a first portion 30 that is opened rearward and a second portion 40 that is opened forward. The first portion 30 and the second portion 40 are partitioned by a partition wall 21 (see FIG. 3). The circuit board 5 is installed in the second portion 40 so as to face the partition wall 21. A terminal 5c for connecting an input / output electric wire is provided at the lower part of the circuit board 5.

  The first cover 50 is attached to the second portion 40 from the front and covers the circuit board 5 with the terminal 5c opened. The first cover 50 cooperates with the second portion 40 to form the first space S1.

  The second cover 60 is attached to the first cover 50 from the front and covers the first cover 50 and the terminal 5c. The second portion 40, the first cover 50, and the second cover 60 constitute the second portion 4 of the main body 2. The front surface of the second cover 60 is used as an operation panel. For example, the operator 6 is disposed on the front surface of the second cover 60.

  The operator 6 receives input from the user of the power conversion device 1 and displays internal information of the power conversion device 1. The operator 6 may be detachable from the front surface of the second cover 60.

  As shown in FIG. 3, the first portion 30 forms the second space S2 therein. The first space S1 and the second space S2 are partitioned by a partition wall 21. When an opening is formed in the partition wall 21, the opening belongs to the second space S2. That is, the front surface of the partition wall 21 is a boundary between the first space S1 and the second space S2.

  The flow path FP1 described above is configured as follows, for example. A vent 32 is formed in the lower portion of the first portion 30, and at least one (for example, two) fans 70 are attached to the upper portion of the first portion 30. When the fan 70 sends air upward or downward, an airflow along the vertical direction is formed in the second space S2. The air forming the airflow is an example of the cooling fluid, and the flow path of the air is an example of the flow path FP1. The first portion 30 constitutes the first portion 3 of the main body 2.

  The first part 3 may have cooling fins 7. The cooling fin 7 radiates heat generated by, for example, a circuit element (for example, a switching element) of the circuit board 5. The cooling fin 7 may be disposed in the flow path FP <b> 1 in the second space S <b> 2 in the first portion 30.

2. Noise filter (1) Power conversion circuit The main body 2 may have a power conversion circuit 90 shown in FIG. The power conversion circuit 90 is configured by circuit elements and the like disposed on the circuit board 5. The power conversion circuit 90 includes a rectifying unit 91 and a switching unit 92.

  The rectifying unit 91 converts AC power (for example, commercial three-phase AC power) from the power source PW1 into DC. The switching unit 92 converts DC power into AC power having a desired frequency (for example, three-phase AC power), and outputs the AC power to a load such as the motor M1.

(2) Noise Filter The power conversion device 1 may include a noise filter 400. The noise filter 400 reduces noise components in the power. The noise filter 400 includes a filter element 410 disposed on the circuit board 5 and guides a noise component (for example, a high-frequency noise component) in power to a conductive structural member. The filter element 410 is, for example, a capacitor. In the following description, when the target for reducing noise components is AC power, “one filter element 410” is a set of a plurality of (for example, four) filter elements 410 provided for all phases of AC Means. The conductive structural member is, for example, the above-described base casing 20.

  The noise filter 400 may be provided at a plurality of locations of the power conversion circuit 90. For example, the noise filter 400 is provided in an AC power input unit and a DC power output unit (between the rectifying unit 91 and the switching unit 92).

(3) Switching Unit As shown in FIGS. 5 and 6, the power conversion device 1 may further include a switching unit 420 and bus bars 430 and 440. The switching unit 420 is disposed at a position away from the circuit board 5 and switches between a conductive structural member (for example, the base housing 20) and the filter element 410 between a conductive state and a non-conductive state.

  The bus bar 430 (first bus bar) electrically connects the filter element 410 and the switching unit 420. One end of the bus bar 430 is fixed to a terminal connected to the filter element 410 on the circuit board 5. The other end of the bus bar 430 is disposed in the switching unit 420. The bus bar 440 (second bus bar) electrically connects the switching unit 420 and the conductive structural member. One end of the bus bar 440 is fixed to the base housing 20. The other end of the bus bar 440 is disposed in the switching unit 420.

  The bus bars 430 and 440 are plate-shaped or bar-shaped conductors. In order to ensure sufficient conductivity, the bus bars 430 and 440 have a cross section that does not deform unless an intentional stress for processing is applied. By using such bus bars 430 and 440, it is possible to suppress voltage fluctuations accompanying the flow of noise current. It is also possible to use the bus bars 430 and 440 as support members for the switching unit 420. If sufficient conductivity can be ensured, the bus bars 430 and 440 may be flexible covered electric wires.

  By performing wiring to the switching unit 420 by the bus bars 430 and 440, it is possible to suppress a decrease in filter performance due to the separation of the switching unit 420 from the circuit board 5. That is, the bus bar 430 functions as means for electrically connecting the filter element 410 and the switching unit 420 while suppressing a decrease in filter performance. The bus bar 440 functions as means for electrically connecting the switching unit 420 and the conductive structural member while suppressing a decrease in filter performance.

  The switching unit 420 may be configured to switch between the bus bars 430 and 440 to a conductive state or a non-conductive state by attaching and detaching a conductive fixture 421 that fixes the bus bars 430 and 440 to each other.

  For example, the fixture 421 is a metal bolt and is screwed into openings 430a and 440a provided at at least one end of the bus bars 430 and 440. The openings 430a and 440a are female screw holes.

  The fixture 421 may be a metal clip that conducts by sandwiching the ends of the bus bars 430 and 440. In this case, it is not necessary to provide the bus bars 430 and 440 with openings for inserting the fixtures 421. In the following description, it is assumed that the fixture 421 is a metal bolt.

  As an example, the switching unit 420 includes fixtures 421 and 427, an insulating block 422, and a relay plate 423. An opening 430 a is formed at the end of the bus bar 430 disposed in the switching unit 420. An opening 440 a is formed at the end of the bus bar 440 disposed in the switching unit 420.

  The insulating block 422 is a block member made of, for example, an electrically insulating resin material. The insulating block 422 has an opening 422a corresponding to the opening 430a and an opening 422b corresponding to the opening 440a.

  The relay plate 423 is formed of the same material as the bus bars 430 and 440, and has an opening 423a corresponding to the opening 430a and an opening 423b corresponding to the opening 440a.

  The insulating block 422 is interposed between the relay plate 423 and the ends of the bus bars 430 and 440. The bus bar 440 and the insulating block 422 are fastened by a fixture 427 with the insulating block 422 interposed therebetween.

  For example, the fixture 427 is a metal bolt. The fixture 427 is threaded into the opening 440a through the opening 423b and the opening 422b. As a result, the relay plate 423, the insulating block 422, and the end of the bus bar 440 are integrated, and the relay plate 423 is electrically connected to the bus bar 440 through the fixture 427. For this reason, the relay plate 423 constitutes an end portion of the bus bar 440. That is, the relay plate 423 is a constituent member of the bus bar 440 in addition to being a constituent member of the switching unit 420. In other words, the bus bar 440 has the relay plate 423 at the end.

  The fixture 421 is screwed into the opening 430a through the opening 423a and the opening 422a. As a result, the relay plate 423 is also electrically connected to the bus bar 430 via the fixture 421. When the fixture 421 is removed, the relay plate 423 is electrically insulated from the bus bar 430.

  The insulating block 422 may have protrusions 424 and 425 for preventing displacement between the opening 422a and the opening 423a. The protrusions 424 and 425 sandwich the relay plate 423 in a direction that intersects the direction in which the openings 423a and 423b are arranged. Thereby, the position shift of the opening 422a and the opening 423a is prevented.

  The insulating block 422 may further include a protrusion 426 for preventing displacement between the opening 422a and the opening 430a. Correspondingly, an opening 430 b that fits into the protrusion 426 may be further formed at the end of the bus bar 430. Thereby, the position shift with the opening 422a and the opening 430a is prevented. Since the protrusions 424, 425, and 426 prevent the positional displacement of the openings 423a, 422a, and 430a, the fixture 421 can be easily attached and detached.

  The bus bars 430 and 440 may be fixed to each other via at least one insulating spacer 450 even at a position away from the switching unit 420. Thereby, position shift of opening 423a, 422a, 430a is prevented more reliably.

  As described above, the power conversion device 1 may include a plurality of filter elements 410 and may include a plurality of switching units 420 respectively corresponding to the plurality of filter elements 410. In this case, as illustrated in FIG. 7, the plurality of switching units 420 may be arranged in a region R5 that is narrower than the region R4 in which the plurality of switching units 420 are arranged on the circuit board 5. In other words, the distance D2 between the plurality of switching units 420 may be smaller than the distance D1 between the plurality of filter elements 410.

  The switching unit 420 may be disposed closer to the one surface between the one surface of the housing 10 and the filter element 410. For example, as illustrated in FIG. 8, the switching unit 420 includes one surface SF <b> 3 (that is, the surface on the operation panel side of the second cover 60) facing the circuit board 5 among the inner surfaces of the first cover 50, and the filter on the circuit board 5. It may be provided on the one surface SF3 side with respect to the virtual surface VP1 that bisects the element 410.

  An opening for arranging the fixture 421 in the switching unit 420 may be formed on the one surface of the housing 10. For example, as shown in FIG. 9, an opening for placing the fixture 421 in the switching unit 420 may be formed in the one surface SF <b> 3 of the first cover 50. That is, the wall portion 51 of the first cover 50 that faces the circuit board 5 may be formed with an opening 50 a for placing the fixture 421 in the switching portion 420. Accordingly, the switching unit 420 can be operated by removing the second cover 60.

  The power conversion device 1 may further include a holder that holds the fixture 421 at a position away from at least one of the bus bars 430 and 440. For example, the holder is provided around the opening 50a. FIG. 9 illustrates a case where a boss 52 is provided around the opening 50a as an example of the holder. The boss 52 is provided on the wall 51 around the opening 50 a and protrudes to the opposite side of the circuit board 5. At the end of the boss 52, an opening 52a for mounting the fixture 421 is formed. When the fixture 421 is a bolt, the opening 52a may be a female screw hole into which the screw portion of the fixture 421 can be screwed.

  By providing such a holder, the fixture 421 can be mounted in the power conversion device 1 even when the bus bars 430 and 440 are in a non-conductive state. Can be prevented. Furthermore, based on whether or not the fixture 421 is attached to the holder, it can be easily confirmed whether the switching unit 420 is in the conductive state or the non-conductive state. Therefore, the usability of the power conversion device 1 can be further improved.

  Within the switching unit 420, the bus bar 440 may be positioned closer to the one surface SF3 than the bus bar 430. That is, the end portion (relay plate 423) of the bus bar 440 may be positioned closer to the one surface SF3 than the end portion of the bus bar 430.

3. Effects of this Embodiment As described above, the power conversion device 1 is disposed at a position apart from the filter element 410 disposed on the circuit board 5 and the circuit board 5, and is a conductive structural member (for example, a base). A switching unit 420 for switching between the housing 20) and the filter element 410 between a conductive state and a non-conductive state, a bus bar 430 that electrically connects the filter element 410 and the switching unit 420, a switching unit, and conductivity And a bus bar 440 for electrically connecting the structural members.

  In the power conversion device 1, the electrical characteristics can be adjusted according to the installation environment by switching the conduction state between the conductive structural member and the filter element 410 by the switching unit 420. The switching unit 420 is disposed at a position away from the circuit board 5, and the bus bar 430 and the bus bar 440 respectively connect between the conductive structural member and the switching unit 420 and between the filter element 410 and the switching unit 420. Connected. Since the bus bar is used for the wiring to the switching unit 420, the deterioration of the filter performance due to the separation of the switching unit 420 from the substrate is suppressed. For this reason, the switching unit 420 can be arranged at a position where the user can easily access while maintaining the filter performance. Therefore, the power converter device 1 with high versatility can be provided.

  The switching unit 420 may switch between the bus bar 430 and the bus bar 440 between a conductive state and a non-conductive state by attaching and detaching the conductive fixing 421 that fixes the bus bar 430 and the bus bar 440 to each other. In this case, the contact resistance in the switching unit 420 can be reduced by using a member that can mechanically fix the bus bar 430 and the bus bar 440 to switch the conduction state of the bus bar 430 and the bus bar 440 as compared to using a general-purpose switch. . Accordingly, it is possible to further suppress a decrease in filter performance due to the provision of the switching unit 420.

  The power conversion apparatus 1 includes a plurality of filter elements 410 and a plurality of switching units 420 respectively corresponding to the plurality of filter elements 410, and the plurality of switching units 420 are arranged on the circuit board 5. It may be arranged in a region R5 that is narrower than the region R4. In this case, accessibility to the switching unit 420 is improved by centrally arranging the plurality of switching units 420 in the narrow region R5.

  The power conversion device 1 may further include a housing 10 that houses the circuit board 5, and the switching unit 420 may be disposed between the one surface SF <b> 3 and the filter element 410 near the one surface SF <b> 3. In this case, the accessibility to the switching unit 420 is further improved by the switching unit 420 being positioned closer to the one surface SF3 that separates the user and the circuit board 5.

  The power conversion device 1 further includes a housing 10 that accommodates the circuit board 5, and the switching unit 420 is disposed near the one surface SF3 between the one surface SF3 of the housing 10 and the filter element 410, and the one surface SF3 includes May be formed with an opening 50a for disposing the fixture 421 in the switching unit 420. In this case, the bus bar 430 and the bus bar 440 can be prevented from being exposed while ensuring the switching workability.

  Within the switching unit 420, the bus bar 440 may be positioned closer to the one surface SF3 than the bus bar 430. In this case, when the bus bar 430 and the bus bar 440 are switched to the conductive state, the fixture 421 comes into contact with the bus bar 440 first. Therefore, when the fixture 421 reaches the bus bar 430, the electric charge of the bus bar 430 can be immediately guided to the conductive structural member.

  DESCRIPTION OF SYMBOLS 1 ... Power converter device, 5 ... Circuit board, 10 ... Housing, 50a ... Opening, 410 ... Filter element, 420 ... Switching part, 421 ... Fixing tool, 430 ... Bus bar (first bus bar), 440 ... Bus bar (second) Bus bar), R4... Region where the filter element 410 is disposed, R5... Region where the switching unit 420 is disposed, SF3.

Claims (5)

A filter element disposed on a circuit board;
A switching unit disposed at a position away from the circuit board and switching between a conductive structural member and the filter element to a conductive state or a non-conductive state;
A first bus bar that electrically connects the filter element and the switching unit;
And a second busbar for electrically connecting between the conductive structural member and the switching unit, the switching unit, an electrically conductive fastener that fixes the first busbar and the second busbar to one another removable by, toggle its power conversion apparatus between the conduction state or non-conduction state between the second busbar and the first bus bars. A plurality of the filter elements;
A plurality of the switching units respectively corresponding to the plurality of filter elements;
Wherein the plurality of switching portions, said plurality of filter elements in the circuit board is disposed in a narrow region as compared to the region disposed claim 1 Symbol placement of the power converter. A housing for accommodating the circuit board;
The switching unit, the are arranged in the one surface closer between the one surface of the casing and said filter element, the power converter according to claim 1 or 2, wherein. A housing for accommodating the circuit board;
The switching unit is disposed closer to the one surface between one surface of the housing and the filter element,
The power converter according to any one of claims 1 to 3 , wherein an opening for arranging the fixture in the switching unit is formed on the one surface. 5. The power conversion device according to claim 4 , wherein the second bus bar is located closer to the one surface than the first bus bar in the switching unit.

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