WO2019234467A1 - Convertisseur électrique - Google Patents

Convertisseur électrique Download PDF

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Publication number
WO2019234467A1
WO2019234467A1 PCT/IB2018/000741 IB2018000741W WO2019234467A1 WO 2019234467 A1 WO2019234467 A1 WO 2019234467A1 IB 2018000741 W IB2018000741 W IB 2018000741W WO 2019234467 A1 WO2019234467 A1 WO 2019234467A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
branch portion
bus bar
branch
cooler
Prior art date
Application number
PCT/IB2018/000741
Other languages
English (en)
Japanese (ja)
Inventor
伸也 駒﨑
Original Assignee
日産自動車株式会社
ルノー エス、ア、エス
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日産自動車株式会社, ルノー エス、ア、エス filed Critical 日産自動車株式会社
Priority to PCT/IB2018/000741 priority Critical patent/WO2019234467A1/fr
Publication of WO2019234467A1 publication Critical patent/WO2019234467A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present invention relates to a power conversion device.
  • Patent Document 1 a method of cooling a power converter is known (Patent Document 1).
  • a capacitor and a switching element are connected by a bus bar, and a cooler is connected to the bus bar.
  • a bus bar connecting a capacitor and a switching element is required to shorten the bus bar length in order to reduce its inductance component, but a cooler is connected to the bus bar as in the invention described in Patent Document 1. In order to do this, it is necessary to lengthen the bus bar. However, when the bus bar is lengthened, the inductance component increases, and thus the surge voltage may increase.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a power converter that has cooling performance and does not increase the length of the bus bar.
  • a power conversion device includes a switching element, a capacitor module that smoothes a voltage input to the switching element, a conductive portion that electrically connects the capacitor module and the switching element, and a branch from the conductive portion. And a cooler that is thermally connected to the branch portion.
  • a power converter that has cooling performance and does not increase the length of the bus bar is realized.
  • FIG. 1 is a schematic configuration diagram of a power conversion device according to the first embodiment of the present invention.
  • FIG. 2 is a schematic configuration diagram of the capacitor module according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining a connection relationship between the capacitor module and the switching element according to the first embodiment of the present invention.
  • FIG. 4 is another diagram illustrating the connection relationship between the capacitor module and the switching element according to the first embodiment of the present invention.
  • FIG. 5 is a schematic configuration diagram of the cooler according to the first embodiment of the present invention.
  • FIG. 6 is a schematic configuration diagram of a power conversion device according to the second embodiment of the present invention.
  • FIG. 7 is a schematic configuration diagram of a power conversion device according to the third embodiment of the present invention.
  • FIG. 8 is a schematic configuration diagram of a power conversion device according to the fourth embodiment of the present invention.
  • FIG. 9 is a schematic configuration diagram of a power conversion device according to the fifth embodiment of the present invention.
  • the power converter device 10 which concerns on 1st Embodiment is demonstrated.
  • the power conversion device 10 includes a DC power supply 20, a capacitor module 100, and a switching element 200.
  • the switching element 200 converts DC power input from the DC power supply 20 into AC power by on / off control, and supplies the AC power to the motor 21.
  • the capacitor module 100 is formed between the DC power supply 20 and the switching element 200. Capacitor module 100 smoothes the voltage between DC power supply 20 and switching element 200. Thereby, voltage and current pulsations of the power supply bus due to switching are suppressed.
  • the bus bar 103 (conductive portion) is formed between the capacitor module 100 and the switching element 200. In other words, the bus bar 103 connects the capacitor module 100 and the switching element 200.
  • the bus bar 103 is made of a conductive member (for example, copper).
  • the capacitor module 100 will be described with reference to FIG.
  • the capacitor module 100 is described as a film capacitor, but the present invention is not limited to this.
  • the capacitor module 100 includes a capacitor element 101, a first electrode 102a, a second electrode 102b, a resin member 105, and a case 104.
  • the first electrode 102a and the second electrode 102b are electrically connected to the capacitor element 101 and are formed to face each other.
  • the first electrode 102 a is connected to the upper surface of the capacitor element 101
  • the second electrode 102 b is connected to the lower surface of the capacitor element 101.
  • the capacitor element 101, the first electrode 102a, and the second electrode 102b will be described separately.
  • the capacitor including the capacitor element 101, the first electrode 102a, and the second electrode 102b will be described. It may be expressed as an element.
  • a first bus bar 103a (first conductive portion) is connected to the first electrode 102a.
  • the second bus bar 103b (second conductive portion) is connected to the second electrode 102b.
  • Part of the first bus bar 103 a and the second bus bar 103 b is drawn out of the case 104.
  • an insulating member 106 is formed between the first bus bar 103a and the second bus bar 103b in a region where the first bus bar 103a and the second bus bar 103b are close to each other.
  • the case 104 houses the capacitor element 101, the first electrode 102a, and the second electrode 102b.
  • the case 104 is made of aluminum, for example.
  • the case 104 is filled with a resin member 105. That is, in the case 104, the capacitor element 101, the first electrode 102a, the second electrode 102b, the first bus bar 103a, and the second bus bar 103b are fixed by the resin member 105.
  • the first bus bar 103 a pulled out from the case 104 is connected to the terminal block 202.
  • the terminal block 202 is connected to a case 201 that houses the switching element 200.
  • the second bus bar 103 b pulled out from the case 104 is also connected to the terminal block 203.
  • the first bus bar 103a and the second bus bar 103b drawn from the case 104 are configured to be short in order to reduce inductance.
  • the first bus bar 103 a and the second bus bar 103 b pulled out from the case 104 are arranged in the vicinity of the switching element 200 so as to face each other with the insulating member 106 interposed therebetween.
  • the first bus bar 103a includes a first branch part 107a (branch part) formed by branching from the first bus bar 103a. Therefore, the 1st branch part 107a is also comprised with the member (for example, copper) which has electroconductivity similarly to the 1st bus-bar 103a. Thus, in this embodiment, the 1st bus-bar 103a and the 1st branch part 107a are one conductive member.
  • the first bus bar 103a electrically connects the capacitor module 100 and the switching element 200.
  • the cooler 300 is connected to the first branch portion 107a.
  • the first branch portion 107a does not constitute an electrical connection, but constitutes a thermal connection.
  • the first branch portion 107 a is cooled by the cooler 300.
  • the first bus bar 103a is also cooled by cooling the first branch portion 107a. Thereby, the capacitor module 100 connected to the first bus bar 103a is also cooled.
  • the second bus bar 103b includes a second branch portion 107b formed by branching from the second bus bar 103b. Therefore, the 2nd branch part 107b is also comprised with the member (for example, copper) which has electroconductivity similarly to the 2nd bus-bar 103b.
  • the second bus bar 103b and the second branch portion 107b are also one conductive member.
  • the second bus bar 103b electrically connects the capacitor module 100 and the switching element 200.
  • the cooler 400 is connected to the second branch portion 107b.
  • the second branch 107b does not constitute an electrical connection, but constitutes a thermal connection.
  • the second branch portion 107b is cooled by the cooler 400.
  • the second bus bar 103b is also cooled by cooling the second branch part 107b. Thereby, the capacitor module 100 connected to the second bus bar 103b is also cooled.
  • the cooler 300 (cooler 400) is thermally connected to the first branch portion 107a (second branch portion 107b) formed by branching from the first bus bar 103a (second bus bar 103b).
  • the cooler 300 (cooler 400) is not connected to the first bus bar 103a (second bus bar 103b), but is connected to the first branch portion 107a (second branch portion 107b). Therefore, it is not necessary to increase the length of the bus bar as in the prior art. Thereby, the power converter device 10 having a cooling performance and a small inductance component of the bus bar is realized.
  • FIG. 3 there are two cooling points, but the present invention is not limited to this.
  • the number of cooling points may be one, or three or more.
  • only one cooler 300 may be connected to the first branch portion 107a.
  • the 1st branch part 107a is branched outside the case 104, it is not limited to this.
  • the first branch portion 107 a may be branched inside the case 104.
  • cooler 300 is not limited to that shown in FIG.
  • the cooler 300 includes a metal member 301, an insulating member 302, cooling water 303, and a water jacket 304.
  • the side surface and the bottom surface of the metal member 301 are covered with an insulating member 302.
  • the first branch portion 107a is made of a conductive member (for example, copper) like the first bus bar 103a, and thus has conductivity.
  • the cooler 300 is also composed of a conductive member (metal member 301). Since the first branch portion 107a is connected to the metal member 301, the current flowing through the first branch portion 107a may flow to the case ground through the metal member 301, the cooling water 303, and the water jacket 304. In order to prevent the current flowing through the first branch portion 107a from flowing into the case ground, it is necessary to insulate the first branch portion 107a from the cooling water 303.
  • insulation is realized by using an electrically insulating heat conductive material at the contact portion between the cooler and the bus bar.
  • the electrical insulating heat conductive material is generally weak in strength and may be destroyed when fixed with bolts. Further, if the cooler and the bus bar are merely brought into contact without using bolts, the contact thermal resistance is high and the cooling effect may not be obtained.
  • the first branch portion 107 a is thermally connected to the metal member 301.
  • a portion of the metal member 301 excluding the surface in contact with the first branch portion 107 a is covered with the insulating member 302. More specifically, the side surface and the bottom surface of the metal member 301 other than the top surface that is in contact with the first branch portion 107 a are covered with the insulating member 302.
  • the 1st branch part 107a and the cooler 300 have sufficient connection strength.
  • the 1st branch part 107a and the cooling water 303 are insulated. Thereby, the 1st branch part 107a is cooled efficiently.
  • the water jacket 304 may be used as an insulating member.
  • the second branch 107b is omitted.
  • the capacitor element 101 repeatedly expands and contracts in the horizontal direction perpendicular to the vertical direction by the Coulomb force generated by the switching current, and vibrates the capacitor module 100.
  • the first branch portion 107a is formed to branch from the first bus bar 103a between the first electrode 102a and the second electrode 102b in the vertical direction. Further, the first branch portion 107 a is pulled out of the case 104.
  • the second branch portion 107b is formed to branch from the second bus bar 103b between the first electrode 102a and the second electrode 102b in the vertical direction. Further, the second branch portion 107 b is pulled out of the case 104.
  • the first branch portion 107a and the second branch portion 107b are formed to be parallel to the first electrode 102a and the second electrode 102b in the horizontal direction. Thereby, the rigidity with respect to expansion and contraction is increased in the horizontal direction, and vibration of the capacitor module 100 is suppressed.
  • coolers 300 and 500 are connected to the upper surface and the lower surface of the first branch portion 107a, respectively. Thereby, the contact area of the 1st branch part 107a and a cooler increases, and cooling performance improves.
  • coolers 300 and 500 are connected to the upper surface and the lower surface of the first branch portion 107a, but the present invention is not limited to this.
  • a cooler may be connected to each of at least two surfaces of the first branch portion 107a.
  • the second branch 107b is omitted.
  • the capacitor element 101 has a larger equivalent series resistance than the bus bar 103 (the first bus bar 103a and the second bus bar 103b). For this reason, when the switching current is large, the heat generation of the capacitor element 101 increases. Further, when the direct current is large, the heat generation of the bus bar 103 (first bus bar 103a, second bus bar 103b) increases.
  • the maximum heat generating portion 600 of the capacitor element 101 is determined by the heat generated by the capacitor element 101 and the heat generated from the bus bar 103 (first bus bar 103a, second bus bar 103b).
  • the first branch portion 107 a is formed in the vicinity of the maximum heat generating portion 600 and is drawn out of the case 104 from the vicinity of the maximum heat generating portion 600.
  • the capacitor module 100 is efficiently cooled by cooling the first branch portion 107a drawn out of the case 104 from the position determined based on the maximum heat generating portion 600.
  • the maximum heat generating portion 600 refers to a portion that generates the most heat in the capacitor module 100.
  • the bus bar 103 (first bus bar 103a, second bus bar 103b) and the switching element 200 are fastened with bolts
  • the bus bar 103 (first bus bar 103a, second bus bar 103b) has contact electrical resistance at the connection point with the switching element 200. It generates the most heat. Therefore, it is conceivable to cool the vicinity of the connection point between the bus bar 103 (the first bus bar 103a and the second bus bar 103b) and the switching element 200.
  • the cooling performance may be reduced due to the dimensional tolerance between the switching element 200 and the cooler 300. More specifically, the contact property on the connection surface between the first bus bar 103a and the switching element 200 and the connection surface between the first branch portion 107a and the cooler 300 is deteriorated, and the cooling performance may be deteriorated.
  • a slit 108 a is formed between the first bus bar 103 a and the first branch portion 107 a in the vicinity of the cooler 300. Further, as shown in FIG. 9, the first branch portion 107 a is formed to branch from the first bus bar 103 a outside the case 104. Similarly, a slit 108b is formed between the second bus bar 103b and the second branch portion 107b in the vicinity of the cooler 400. Further, the second branch portion 107 b is formed to branch from the second bus bar 103 b outside the case 104.
  • the slits 108a and 108b are formed in a direction perpendicular to the horizontal direction, but the present invention is not limited to this.
  • the slits 108a and 108b may be formed in the horizontal direction (see FIG. 3).
  • the slits 108 a and 108 b are formed outside the case 104.
  • the slit 108a (108b) may be formed so as to have a region overlapping with the cooler 300 (cooler 400) when the power converter 10 is viewed from above.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne un convertisseur de puissance (10) qui comprend : un élément de commutation (200) pour convertir une puissance électrique en courant continu en une puissance électrique en courant alternatif ; un module de condensateur (100) pour lisser la tension à entrer dans l'élément de commutation (200) ; une partie conductrice (103a) pour connecter électriquement le module de condensateur (100) et l'élément de commutation (200) ; un élément conducteur qui comprend une partie de ramification (107b) formée par dérivation à partir de la partie conductrice (103a) ; et un refroidisseur (300) qui est relié thermiquement à la partie de ramification (107b).
PCT/IB2018/000741 2018-06-08 2018-06-08 Convertisseur électrique WO2019234467A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/000741 WO2019234467A1 (fr) 2018-06-08 2018-06-08 Convertisseur électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/000741 WO2019234467A1 (fr) 2018-06-08 2018-06-08 Convertisseur électrique

Publications (1)

Publication Number Publication Date
WO2019234467A1 true WO2019234467A1 (fr) 2019-12-12

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ID=68769256

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Application Number Title Priority Date Filing Date
PCT/IB2018/000741 WO2019234467A1 (fr) 2018-06-08 2018-06-08 Convertisseur électrique

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WO (1) WO2019234467A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252461A (ja) * 2009-04-14 2010-11-04 Denso Corp 電力変換装置
JP2018067998A (ja) * 2016-10-18 2018-04-26 三菱電機株式会社 電力変換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252461A (ja) * 2009-04-14 2010-11-04 Denso Corp 電力変換装置
JP2018067998A (ja) * 2016-10-18 2018-04-26 三菱電機株式会社 電力変換装置

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