JP2010148197A - Power conversion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power conversion apparatus capable of improving efficiency of work for exchanging a plurality electrolytic capacitors mounted on power conversion units. <P>SOLUTION: The power conversion apparatus has a configuration in which a plurality of units for power conversion are housed in multiple stages in a casing, and the plurality of units are freely pulled out toward an opening provided on the front of the casing. This apparatus includes a power conversion unit 33 mounted with a plurality of electrolytic capacitors 63 for smoothing voltage. The power conversion unit 33 includes a capacitor holder 76 fixed removably in a unit case 33d while holding the plurality of electrolytic capacitors 63. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power conversion device in which a plurality of units are accommodated in a multistage manner in a casing, and more particularly to a structure of a power conversion unit in which a plurality of electrolytic capacitors are mounted.

An uninterruptible power supply device is known as a power conversion device that stably supplies power to a plant measurement facility or a computer. An uninterruptible power supply is normally housed in a state in which a plurality of control components are unitized in a casing.
For example, in the apparatus of Patent Document 1, a plurality of units in which control components are mounted according to functions are housed in multiple stages in a casing.

In the device of Patent Document 1, wirings for connecting the units on the power source side and the load side and the wirings for connecting the units are provided on the rear part (rear surface) of each unit. Each unit is housed so that it can be pulled out from the housing. When maintenance or inspection of each unit is performed, each unit is pulled out to the front of the housing.
Further, for example, Patent Document 2 describes a unitized inverter unit, and a power semiconductor element such as a plurality of electrolytic capacitors (voltage smoothing capacitors) and IGBTs (insulated gate bipolar transistors) in a case. Modules, heat sinks, cooling fans, etc. are installed.
JP-A-6-86567 JP 2004-180424 A

By the way, the electrolytic capacitor mounted in the inverter part is a consumable part, and replacement work is performed regularly.
However, the conventional unitized inverter unit removes the electrolytic capacitor to be replaced after disassembling all other components (power semiconductor element module, heat sink, cooling fan), so much trouble is required for the replacement work. Is currently spending time.

  Then, this invention is made | formed in view of the said situation, and it aims at providing the power converter device which can aim at the efficiency improvement of the exchange operation | work of the some electrolytic capacitor mounted in the power conversion unit.

  In the power conversion device according to the present invention, a plurality of units that perform power conversion are housed in multiple stages in a housing, and the plurality of units can be pulled out toward the opening provided on the front surface of the housing. The power conversion device includes a power conversion unit equipped with a plurality of electrolytic capacitors for smoothing the voltage, and the power conversion unit holds the plurality of electrolytic capacitors and is detachably fixed in a unit case. A capacitor holder was provided.

According to the present invention, when replacing the plurality of electrolytic capacitors mounted on the power conversion unit, the unit case and the capacitor holding body are separated, so that the plurality of electrolytic capacitors are replaced together with the capacitor holding body. be able to.
Further, in the power conversion device according to the present invention, the capacitor holder is disposed on the front side of the unit case, and at least the cooling fan mounted on the front side from the capacitor holder is removed, You may make it detachable from the unit case only by removing the wiring of the capacitor.

According to the present invention, the plurality of electrolytic capacitors together with the capacitor holder can be obtained by pulling out only the front side of the power conversion unit from the housing to a position where the wiring of the electrolytic capacitor can be removed without pulling out the entire power conversion unit from the housing. Therefore, it is easy to replace a plurality of electrolytic capacitors.
Furthermore, in the power converter according to the present invention, the unit case includes a pair of guide rails extending in the depth direction in parallel with each other toward the case opening provided on the front surface, and at the edge of the capacitor holder A pair of slide plates may be provided which are in contact with the pair of guide rails and are slidable toward the case opening.

  According to the present invention, the capacitor holding body holding a plurality of electrolytic capacitors can be slid to the front side along the pair of guide rails provided in the unit case, so that labor saving of electrolytic capacitor replacement work can be achieved. .

  According to the power conversion device of the present invention, when replacing the plurality of electrolytic capacitors mounted on the power conversion unit, the unit case and the capacitor holding body are separated from each other, so that the plurality of capacitor capacitors and the capacitor holding body are separated. Since the electrolytic capacitor can be replaced, the efficiency of the electrolytic capacitor replacement operation can be increased.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the uninterruptible power supply according to the present invention from the front side and the rear side, and FIG. 2 is a view showing the inside of the housing by removing the front cover of the uninterruptible power supply and opening the front door. 3 is a connection diagram in the uninterruptible power supply, FIG. 4 is a schematic view seen from the side showing a state in which a plurality of units are arranged in multiple stages in the housing, and FIG. 5 is a perspective view showing the first reactor unit. 6 is a plan view of the first reactor unit, FIG. 7 is a diagram showing an electrical connection structure of the first reactor unit and the first power conversion unit, FIG. 8 is a perspective view showing the first power conversion unit, and FIG. FIG. 10 is a front view of one conversion unit, FIG. 10 is a plan view showing a semiconductor element and an electrolytic capacitor mounted on the first power conversion unit, and FIG. 11 is an element connection conductor plate and a capacitor connection conductor plate from the state of FIG. Plane showing the state of placing 12 is a perspective view showing the shape of the holding plate, FIG. 13 is a view showing the electrolytic capacitor held on the holding plate, and FIG. 14 is a part of the cooling fan, fuse, and copper bar constituting the first power conversion unit. FIG. 15 is a front view showing a state in which the cooling fan is removed from the first power conversion unit, and FIG. 16 is a drawing of the holding plate holding the electrolytic capacitor to the front opening side of the case. FIG.

(Configuration of uninterruptible power supply)
As shown in FIGS. 1A and 1B, the uninterruptible power supply according to the present invention covers a front opening portion of the housing 20 with a front cover 21 and an opening / closing door 22, and the side opening of the housing 20 is opened. The side cover 23 covers the surface, the back opening of the housing 20 is covered by the back cover 24, and the top opening portion of the housing 20 is covered by the top cover 25.

  An intake slit 26 for sucking air into the inside of the housing 20 is formed in a region from the lowermost part to the upper part of the front cover 21 and the opening / closing door 22. The back cover 24 is also formed with an exhaust slit 27 for discharging the air inside the housing 20 to the outside. The top cover 25 is also formed with an exhaust slit 28 for exhausting the air inside the housing 20 to the outside, and an outside line drawing space such as a main circuit line and a signal line is formed.

  As shown in FIG. 2, a partition wall 29 that divides the interior into left and right spaces is disposed in the housing 20, and two sets of uninterruptible power supply units UPS1 and UPS2 are housed in the left and right spaces. Since the two sets of uninterruptible power supply units UPS1 and UPS2 are housed in the casing 20 as units of the same structure, only one uninterruptible power supply unit UPS1 will be described. Although not shown, the two uninterruptible power supply units UPS1 and UPS2 have an input terminal connected to a commercial power supply and an output terminal connected to a load connected in parallel. In this embodiment, as an example, two sets of uninterruptible power supply units UPS1 and UPS2 are connected in parallel. However, two or more sets of uninterruptible power supply units can be connected in parallel. .

The uninterruptible power supply unit UPS1 includes a plurality of units including a terminal unit 30, an MC (magnet contactor) unit 31, a first reactor unit 32, a first power conversion unit 33, a second reactor unit 34, and a second power conversion unit 35. The housing 20 is arranged in multiple stages in the vertical direction.
As shown in FIG. 3, the first reactor unit 32 is a device that includes an AC reactor 32a for three phases and DC reactors 32b and 32c, and is a device that suppresses high-frequency components of AC current input from a commercial power source. is there.

The first power conversion unit 33 is a device including a power semiconductor element such as an IGBT (insulated gate bipolar transistor), a power semiconductor element cooling body, an electrolytic capacitor, and the like, and is input from a commercial power source via the first reactor unit 32. It is a converter device that converts commercial power from alternating current to direct current.
The second power conversion unit 35 is also a device including a power semiconductor element such as an IGBT (insulated gate bipolar transistor), a power semiconductor element cooling body, an electrolytic capacitor, and the like, and the direct-current power input from the first power conversion unit 33. Or it is an inverter apparatus which converts the direct-current power input from the storage battery 36 (refer FIG. 3) arranged in parallel with this apparatus into alternating current.

As shown in FIG. 3, the second reactor unit 34 is a device that includes an AC reactor 34 a for three phases and AC reactors 34 b and 34 c for N phases, and an AC current output from the second power conversion unit 35. Is a device for suppressing the high-frequency component of.
As shown in FIG. 3, the MC unit 31 is a device including a plurality of electromagnetic contactors 38a to 38d, a plurality of reactors 41a to 41c, a main control unit, a protective fuse, a control signal interface circuit, and the like. It is a device that supplies stable AC power to a load by ON / OFF control of the contactors 38a to 38d.
The terminal unit 30 includes an AC input A-phase, B-phase, C-phase, direct-feed input Ac-phase, Bc-phase and Cc-phase, neutral-phase N commercial power supply side terminals, a + -phase terminal for connecting the storage battery 36, and A phase terminal, an AC output a phase terminal, a b phase terminal, a c phase terminal, and a neutral phase N terminal are provided.

  As shown in FIG. 4, the side cover 23 and the partition wall 29 of the housing 20 are provided with support guide rails 37a to 37f extending to the front cover 21 side (or the door 22 side) and the back cover 24 side. Yes. The support guide rails 37a and 37b arranged on the upper side support the terminal unit 30 and the MC unit 31 from below. In addition, the support guide rails 37c to 37f arranged at the center and the lower part in the vertical direction lower the first reactor unit 32, the first power conversion unit 33, the second reactor unit 34, and the second power conversion unit 35. I support from. Then, by removing fixing means (not shown) such as screws for fixing each unit and the frame (not shown) of the housing 20, the terminal unit 30, the MC unit 31, the first reactor unit 32, the first power The conversion unit 33, the second reactor unit 34, and the second power conversion unit 35 can slide on the support guide rails 37a to 37f and be pulled out to the front side.

  As shown in FIG. 4, fan units 43 to 46 are arranged on the front side of the first reactor unit 32, the first power conversion unit 33, the second reactor unit 34, and the second power conversion unit 35. The fan units 43 to 46 take in cold air from the front cover 21 and the intake slit 26 of the open / close door 22 and pass it through each unit. The air that has passed through each unit is discharged to the outside from the exhaust slit 27 of the back cover 24.

(Structure of the first reactor unit)
As shown in FIG. 5, the first reactor unit 32 has a fan unit 43 mounted on the front side of a tray-shaped case 32d, and AC reactors 32a1, 32a2, 32a3 and DC reactors 32b, 32c are mounted on the case 32d. is set up. Here, the AC reactors 32a1, 32a2, and 32a3 specifically show the AC reactor 32a shown in FIG. 3, and are respectively connected to the three-phase (A, B, C) input terminals of the three-phase four-wire commercial power source. Is.

  As shown in FIG. 6, a plurality of wiring passage holes 66 to 69 penetrating in the vertical direction are formed at positions close to the fan unit 43 of the case 32 d. The reactor terminals 70 to 73 on the output side of the AC reactors 32 a 1, 32 a 2, 32 a 3 and the DC reactor 32 b are passed through these wiring passage holes 66 to 69 from above, so that the output terminals 74 of the reactor wires 70 to 73 are cased. It protrudes below 32d (see FIG. 7).

(Structure of the first power conversion unit)
As shown in FIG. 7 to FIG. 9, the first power conversion unit 33 includes a fan unit 44 mounted on the front side of a box-shaped case 33d whose upper and front surfaces are open, and a plurality of first power conversion units 33 on the back side of the case 33d. Printed circuit board 33b, fuse 33e, input side copper bars 56 to 59, semiconductor element 33a, and input side copper bar mounted with a gate drive unit for controlling each semiconductor element 33a accommodated adjacent to the semiconductor element 33a and the fan unit 44 A connection copper bar 33f and a fuse 33e for electrically connecting 56 to 59 are provided.

  In addition, as shown in FIG. 10, the first power conversion unit 33 has a plurality of semiconductor elements 33 a mounted on a cooling block (cooling fin) 65 and holds a plurality of electrolytic capacitors 63 on the front side of the cooling block 65. As shown in FIG. 11, the plurality of semiconductor elements 33a are connected by the element connection conductor plate 64a disposed above them and held by the holding plate 76. The plurality of electrolytic capacitors 63 are connected by a capacitor connection conductor plate 64b arranged above them.

As shown in FIG. 7, the input-side copper bars 56 to 59 are electrically connected to the semiconductor element 33 a via the connection copper bar 33 f, and the fixing portion 61 disposed on the insulator 60, and the fixing portion 61. The input terminal 62 is bent at a right angle to the input terminal 62, and a screw hole 62a (see FIG. 9) through which the terminal fixing screw 55 is inserted is formed in the input terminal 62.
Here, as shown in FIG. 10, a pair of plate guide pieces 33d1 and 33d2 extending toward the front opening of the case 33d are formed on the upper edges of the pair of side plates of the case 33d, and a plurality of electrolytic capacitors are formed. A holding plate 76 holding 63 is fixed on the pair of plate guide pieces 33d1 and 33d2.

  As shown in FIG. 12, the holding plate 76 comes into contact with the pair of plate guide pieces 33d1 and 33d2 from above and is detachably fixed to the plate guide pieces 33d1 and 33d2 via a fixing screw 77 (see FIG. 10). A pair of slide pieces 76a and 76b, a capacitor holding portion 76c integrally formed at a lower position between the pair of slide pieces 76a and 76b, and a capacitor holding portion 76c sandwiched between the pair of slide pieces 76a and 76b. A rising portion 76d rising from one edge portion, a parallel portion 76e extending in parallel with a direction away from the capacitor holding portion 76c from the upper end of the rising portion 76d, and a falling edge from the edge of the parallel portion 76e And a formed handle portion 76f. The capacitor holding portion 76 c is formed with an insertion hole 76 c 1 through which the body portion of each electrolytic capacitor 63 is inserted.

As shown in FIG. 15, the rising portion 76d, the parallel portion 76e, and the handle portion 76f of the holding plate 76 are formed of a gate-shaped sheet metal member on which the printed board 33b is mounted, and are formed on the upper edges of the pair of side plates of the case 33d. It is housed inside a fixed substrate support member 79.
As shown in FIG. 13, a fixing band 78 is attached to the body of the electrolytic capacitor 63, and the body of the electrolytic capacitor 63 is inserted into the insertion hole 76c1 so that the fixing piece 78a of the fixing band 78 is held by the capacitor. A plurality of electrolytic capacitors 63 are arranged on the capacitor holding portion 76c by being fixed to the portion 76c from the lower surface with fixing screws (not shown).

  As shown in FIG. 7, the electrical connection structure of the first reactor unit 32 and the first power conversion unit 33 configured as described above includes reactor wires 70 to 73 protruding downward from the case 32 d of the first reactor unit 32. The output terminal 74 is made to correspond to the input terminal 62 of the input side copper bars 56 to 59 of the first power conversion unit 33. And the screw hole of the output terminal 74 of the reactor wiring 72 and the screw hole 62a of the input terminal 62 of the input side copper bar 58 correspond, and although not shown, the screw holes of the output terminals 74 of the other reactor wirings 70, 71, 73 And the screw holes 62a of the input terminals 62 of the input side copper bars 56, 57, 59 are also made to correspond to each other. Then, terminal fixing screws (not shown) inserted into these screw holes are screwed into nuts (not shown), whereby the reactor wires 70 to 73 of the AC reactors 32a1, 32a2, 32a3 and the DC reactor 32b and the input are input. The input terminals 62 of the side copper bars 56 to 59 are electrically connected.

(Procedure for replacing the electrolytic capacitor of the first power conversion unit)
Next, a procedure for replacing the plurality of electrolytic capacitors 63 housed in the first power conversion unit 33 will be described with reference to FIGS. 14 to 16.
First, the first power conversion unit 33 is pulled out to the front side of the housing 20 while sliding on the support guide rail 37 d of the housing 20. Here, the 1st power conversion unit 33 pulls out from the housing | casing 20 to the position which can remove the wiring (input side copper bars 56-59) of the electrolytic capacitor 63. FIG.

  Next, as shown in FIG. 14, the fan unit 44 attached to the front surface of the case 32d is removed, and only the connection on the electrolytic capacitor 63 side of the connection copper bar 33f is removed, and the fuse 33e and the input side copper bars 56 to 59 are removed. Remove. At this time, the connection on the semiconductor element 33a side of the element connection conductor plate 64a, the capacitor connection conductor plate 64b, and the connection copper bar 33f is not removed.

Here, by removing the fan unit 44 from the front surface of the case 32d, as shown in FIG. 15, the fan unit 44 is housed in a gate-shaped substrate support member 79 in which the printed circuit board 33b is mounted in the front opening of the first power conversion unit 33. The handle portion 76f of the holding plate 76 is positioned.
Next, the fixing screw 77 (see FIG. 14) that fixes the plate guide pieces 33d1 and 33d2 of the case 32d and the pair of slide pieces 76a and 76b of the holding plate 76 is removed.

  Then, as shown in FIG. 16, the grip portion 76f of the holding plate 76 is grasped, and the pair of slide pieces 76a and 76b are slid on the pair of plate guide pieces 33d1 and 33d2 toward the front opening of the case 33d. And move it. Thereby, the holding plate 76 holding the plurality of electrolytic capacitors 63 to be replaced is taken out to the front opening of the case 33d while passing through the gate-shaped substrate support member 79.

  Then, the capacitor connection conductor plate 64b is removed, and the holding plate 76 holding a plurality of new electrolytic capacitors 63 is mounted in the case 33d in the reverse procedure, and other parts removed for replacement are returned to their original positions. By attaching, the replacement work of the electrolytic capacitor 63 of the first power conversion unit 33 is completed.

(Operational effect of this embodiment)
Next, the function and effect of this embodiment will be described.
When the electrolytic capacitor 63 of the first power conversion unit 33 is replaced, all the electrolytic capacitors 63 can be replaced together with the holding plate 76 by separating the case 33d and the holding plate 76 from each other.
Further, when the holding plate 76 is grasped and the holding plate 76 is pulled out to the front opening of the case 33d, the slide pieces 76a and 76b of the holding plate 76 slide up the pair of plate guide pieces 33d1 and 33d2 of the case 33d. Therefore, the plurality of electrolytic capacitors 63 which are heavy can be easily taken out from the case 33d together with the holding plate 76. Further, when the holding plate 76 holding a plurality of new electrolytic capacitors 63 is mounted on the case 33d, the slide pieces 76a and 76b of the holding plate 76 are placed on the pair of plate guide pieces 33d1 and 33d2 of the case 33d. A plurality of electrolytic capacitors 63 can be easily mounted simply by sliding in the depth direction. As described above, this embodiment can save labor for replacing the plurality of electrolytic capacitors 63.

  Further, the plurality of electrolytic capacitors 63 held by the holding plate 76 are mounted on the front side of the case 33d, and at least the fan unit 44 can be obtained without removing all the components mounted on the case 33d from the case 33d. The replacement work can be performed only by removing the wiring of the electrolytic capacitor 63 and the efficiency of the replacement work.

  Moreover, the 2nd power conversion unit 35 of this embodiment can also have the effect mentioned above by making it the same structure as the 1st power conversion unit 33 mentioned above.

It is the perspective view which showed the uninterruptible power supply from the front side and the back side. It is the figure which removed the front cover of the uninterruptible power supply, opened the front door, and showed the inside of a housing. It is a connection diagram of an uninterruptible power supply part. It is a figure which shows the state by which the several unit is arrange | positioned in the housing | casing in multiple stages. It is a perspective view which shows a 1st reactor unit. It is a top view which shows a 1st reactor unit. It is a figure which shows the electrical connection structure of a 1st reactor unit and a 1st power conversion unit. It is a perspective view which shows a 1st power conversion unit. It is the figure which showed the 1st conversion unit from the front. It is a top view which shows the semiconductor element and electrolytic capacitor which are mounted in the 1st power conversion unit. It is a top view which shows the state which has arrange | positioned the element connection conductor plate and the capacitor | condenser connection conductor plate from the state of FIG. It is a perspective view which shows the shape of a holding plate. It is a figure which shows the electrolytic capacitor currently hold | maintained at the holding plate. It is a top view which shows the state which removed the cooling fan, fuse, and copper bar which comprise a 1st power conversion unit. It is a front view which shows the state which removed the cooling fan from the 1st power conversion unit. It is a figure which shows the state which has pulled out the holding | maintenance plate holding the electrolytic capacitor to the front opening side of a case.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Housing | casing, 21 ... Front cover, 22 ... Open / close door, 23 ... Side cover, 24 ... Back cover, 25 ... Top cover, 26 ... Intake slit, 27 ... Exhaust slit, 28 ... Exhaust slit, 29 ... Bulkhead, DESCRIPTION OF SYMBOLS 30 ... Terminal unit, 31 ... MC unit, 32 ... 1st reactor unit, 32a ... AC reactor, 32a1, 32a2, 32a3 ... AC reactor, 32b, 32c ... DC reactor, 32d ... Case, 33 ... 1st power conversion unit ( Power conversion unit), 33a ... semiconductor element, 33b ... printed circuit board, 33d ... case (case unit), 33d1, 33d2 ... plate guide piece (guide rail), 33e ... fuse, 33f ... connection copper bar (capacitor wiring), 34 ... 2nd reactor unit, 34b, 34c ... AC reactor, 35 ... 1st Power conversion unit (power conversion unit), 36 ... accumulator, 37a-37f ... support guide rail, 38a-38d ... electromagnetic contactor, 43-46 ... fan unit (cooling fan), 41a-41c ... reactor, 56-59 ... Input side copper bar, 60 ... insulator, 61 ... fixed part, 62 ... input terminal, 62a ... screw hole, 63 ... electrolytic capacitor, 64a ... element connection conductor plate, 64b ... capacitor connection conductor plate, 65 ... cooling block, 66- 69 ... Wiring passage hole, 70-73 ... Reactor wiring, 74 ... Output terminal, 76 ... Holding plate (capacitor holder), 76a, 76b ... Slide piece (slide plate), 76c ... Capacitor holding part, 76c1 ... Insertion hole, 76d: rising portion, 76e: parallel portion, 76f ... handle portion, 78 ... fixing band, 78a ... fixing piece, 79 ... substrate support member, U S1, UPS2 ... uninterruptible power supply unit

Claims (3)

In the housing, a plurality of units for performing power conversion are housed in multiple stages, and the plurality of units can be pulled out toward the opening provided on the front surface of the housing.
Equipped with a power conversion unit equipped with multiple electrolytic capacitors that smooth the voltage,
The power conversion unit includes a capacitor holder that holds the plurality of electrolytic capacitors and is detachably fixed in a unit case.   The capacitor holder is disposed on the front side of the unit case, and the cooling fan mounted on the front side of the capacitor holder is removed and the capacitor case is detached from the unit case by removing the wiring. The power conversion device according to claim 1, wherein the power conversion device is enabled.   The unit case includes a pair of guide rails extending in a depth direction parallel to each other toward a case opening provided on the front surface, and the edge of the capacitor holder is in contact with the pair of guide rails, respectively. The power converter according to claim 1, further comprising a pair of slide plates slidable toward the case opening.

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