JP5733234B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device having a reactor and a capacitor.

  2. Description of the Related Art Conventionally, a power conversion device including a booster circuit that boosts a DC voltage and an inverter circuit that converts the boosted DC voltage into an AC voltage is known (Patent Document 1 below). Electronic components constituting the power converter include a semiconductor module incorporating a semiconductor element, a capacitor, and a reactor.

  The capacitor is provided to remove noise included in the DC voltage. The power conversion device boosts a DC voltage using a reactor and converts the boosted DC voltage into an AC voltage by switching the semiconductor element.

  The capacitor and the reactor are arranged at positions close to each other in the power conversion device. Moreover, these capacitors and the reactor are electrically connected by a bus bar.

JP 2011-49495 A

  However, the conventional power conversion device has a structure in which heat generated from the reactor during operation is easily transmitted to the capacitor, and there is a problem that the temperature of the capacitor is likely to rise. That is, since the reactor and the capacitor are arranged close to each other and are connected to each other by the bus bar, most of the heat generated from the reactor reaches the capacitor through the bus bar. For this reason, the temperature of the capacitor is likely to rise. And there exists a problem that a capacitor | condenser heats up too much and deteriorates.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a power converter that easily suppresses a rise in the temperature of a capacitor.

According to a first aspect of the present invention, a capacitor for removing noise included in the voltage of a DC power supply,
A reactor for transforming the voltage of the DC power source,
A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
Of the heat transferred to the positive electrode bus bar generated from the reactor through the reactor connection terminals, the amount of heat transferred to the power connection terminals are configured to be larger than the amount of heat transferred to the capacitor connecting terminal ,
In the positive electrode bus bar, the minimum cross-sectional area between the reactor connection terminal and the power supply connection terminal is larger than the minimum cross-sectional area between the reactor connection terminal and the capacitor connection terminal. (Claim 1).
Further, the second aspect of the present invention is a capacitor for removing noise included in the voltage of the DC power supply;
A reactor for transforming the voltage of the DC power source,
A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power connection terminal is configured to be greater than the amount of heat transferred to the capacitor connection terminal. ,
The length of the path through which the heat is transferred from the reactor connection terminal to the capacitor connection terminal is longer than the length of the path through which the heat is transferred from the reactor connection terminal to the power connection terminal. (Claim 2).
Further, according to a third aspect of the present invention, there is provided a capacitor for removing noise included in the voltage of the DC power supply,
A reactor for transforming the voltage of the DC power source,
A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power connection terminal is configured to be greater than the amount of heat transferred to the capacitor connection terminal. ,
The positive electrode bus bar includes another device connection terminal for connecting to another electronic device, and is transmitted to the other device connection terminal out of heat generated from the reactor and transferred to the positive electrode bus bar through the reactor connection terminal. The power converter is configured such that the amount of heat is larger than the amount of heat transmitted to the capacitor connection terminal.
A fourth aspect of the present invention is a capacitor for removing noise included in the voltage of the DC power supply;
A reactor for transforming the voltage of the DC power source,
A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power supply connection terminal is configured to be larger than the amount of heat transferred to the capacitor connection terminal. ,
The reactor includes a core made of a soft magnetic material and an electromagnetic coil wound around a part of the core, and the core has a non-winding portion around which the electromagnetic coil is not wound. A winding part is interposed between the capacitor and the electromagnetic coil. The power converter according to claim 4.

  In the power converter, the reactor connection terminal, the capacitor connection terminal, and the power supply connection terminal are formed on the positive bus bar. And it comprised so that the quantity of the heat | fever transmitted to a power supply connection terminal might become larger than the quantity of the heat | fever transmitted to a capacitor | condenser connection terminal among the heat | fever which moved to the positive electrode bus bar through the reactor connection terminal from the reactor. If it does in this way, it can suppress that the heat which moved to the positive electrode bus bar from the reactor is transmitted to a capacitor | condenser through a capacitor | condenser connection terminal. Therefore, the temperature rise of the capacitor can be suppressed, and the capacitor can be prevented from deteriorating.

  As described above, according to this example, it is possible to provide a power conversion device that can easily suppress the temperature rise of the capacitor.

The top view of the power converter device in Example 1. FIG. The principal part enlarged view of FIG. The top view of a reactor in Example 1. FIG. AA sectional drawing of FIG. BB sectional drawing of FIG. CC sectional drawing of FIG. DD sectional drawing of FIG. The top view of the power converter device which removed the laminated body from FIG. 1 and looked through the inside of a capacitor | condenser. EE sectional drawing of FIG. FF sectional drawing of FIG. The circuit diagram of the power converter device in Example 1. FIG.

  The power conversion device can be a vehicle power conversion device to be mounted on a vehicle such as a hybrid vehicle or an electric vehicle.

In the first aspect of the present invention, the minimum cross-sectional area between the reactor connection terminal and the power supply connection terminal in the positive electrode bus bar is the minimum between the reactor connection terminal and the capacitor connection terminal. not larger than the cross-sectional area.
Therefore , the heat of the reactor can be reliably guided to the power connection terminal. That is, the heat of the reactor is more easily transmitted along the path having the larger minimum cross-sectional area. Therefore, if it is set as the said structure, it will become easy for the heat | fever of a reactor to advance the path | route which has a larger minimum cross-sectional area, ie, the path | route which goes from a reactor connection terminal to a power supply connection terminal. Therefore, it is possible to reliably guide the heat of the reactor to the power connection terminal.
The “minimum cross-sectional area” means the minimum cross-sectional area on the path through which heat is transmitted among the cross-sectional areas of the positive electrode bus bar in a plane orthogonal to the direction in which heat is transmitted.

In the second aspect of the present invention, the length of the path through which the heat is transferred from the reactor connection terminal to the capacitor connection terminal is the length of the path through which the heat is transferred from the reactor connection terminal to the power supply connection terminal. We length than is.
Therefore , since the path through which the heat of the reactor is transmitted from the reactor connection terminal to the capacitor connection terminal is long, the heat can be radiated to the surroundings while traveling through this path. Therefore, the amount of heat transferred to the capacitor can be reduced.

Moreover, in the said 3rd aspect of this invention, the said positive electrode bus bar is provided with the other apparatus connection terminal for connecting with another electronic device, is generated from the said reactor, and passes through the said reactor connection terminal to the said positive electrode bus bar. of the moved heat, the amount of heat transferred to the other device connection terminal, that is configured to be larger than the amount of heat transferred to the capacitor connecting terminal.
Therefore , a lot of heat can be transferred to the other device connection terminal. Therefore, the amount of heat transferred to the capacitor connection terminal can be further reduced.

In the fourth aspect of the present invention, the reactor includes a core made of a soft magnetic material and an electromagnetic coil wound around a part of the core. There are non-winding portion that is not wound, non-winding portion that are interposed between the capacitor and the electromagnetic coil.
In this case, the temperature rise of the capacitor can be further suppressed. That is, the electromagnetic coil of the reactor easily generates heat, but the core hardly generates heat. With the above configuration, the core that does not easily generate heat can be disposed in the vicinity of the capacitor, and the electromagnetic coil that generates heat can be moved away from the capacitor. Therefore, the radiant heat transmitted from the electromagnetic coil to the capacitor can be reduced.

Further, when viewed from the plate thickness direction of the positive electrode bus bar, the electromagnetic coil is preferably interposed between the capacitor connection terminal and the reactor connection terminal (claim 8 ).
In this case, the capacitor connection terminal and the reactor connection terminal can be further away. Therefore, it becomes easy to radiate heat until the heat of the reactor moves from the reactor connection terminal to the capacitor connection terminal. This makes it possible to reduce the amount of heat transferred to the capacitor.

The surface of the core is covered with an insulating resin body, the electromagnetic coil is wound around the insulating resin body, and the positive terminal of the capacitor and the capacitor connection terminal of the positive bus bar are fastened together. it is preferable that the terminal block for are formed on the insulating resin material (claim 9).
In this case, the core and the electromagnetic coil can be insulated from each other using an insulating resin body. Further, since the terminal block is formed on the insulating resin body, it is not necessary to make the terminal block a separate part. Thereby, a number of parts can be reduced and it becomes possible to reduce the manufacturing cost of a power converter device.

The positive electrode bus bar is preferably formed separately from the insulating resin body (claim 10 ).
In this case, since the positive electrode bus bar can be exposed from the insulating resin body, it becomes easier to dissipate the heat of the reactor. As a result, the amount of heat transferred to the capacitor can be reduced.

Also includes a negative bus bar that connects the negative electrode and the capacitor of the DC power source and a negative electrode terminal and the negative bus bar of the capacitor, it is preferable that are fastened in the terminal block (claim 11).
In this case, since the negative electrode terminal of the capacitor and the negative electrode bus bar can be fastened on a terminal block formed on an insulating resin body, there is no need to provide a dedicated terminal block for fastening the negative electrode bus bar. Therefore, the number of parts can be reduced, and the manufacturing cost of the power conversion device can be reduced.

Example 1
The Example which concerns on the said power converter device is described using FIGS. As shown in FIG. 1, the power conversion device 1 of this example includes a capacitor 2, a reactor 3, and a positive bus bar 4. The capacitor 2 removes noise included in the voltage of the DC power supply 7 (see FIG. 11). The reactor 3 is provided to transform the voltage of the DC power supply 7. The positive bus bar 4 is provided to connect the reactor 3 and the capacitor 2 to the positive electrode of the DC power supply 7.

  As shown in FIG. 2, the positive electrode bus bar 4 has a capacitor connection terminal 41 connected to the capacitor 2, a reactor connection terminal 42 connected to the reactor 3, and a power supply connection terminal 43 for connection to the DC power supply 7.

  Of the heat Q generated from the reactor 3 and moved to the positive bus bar 4 through the reactor connection terminal 42, the amount of heat Q1 transmitted to the power supply connection terminal 43 is larger than the amount of heat Q2 transmitted to the capacitor connection terminal 41. It is configured as follows.

  The power conversion device 1 of this example is a vehicle-mounted power conversion device to be mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

  As shown in FIG. 1, the power conversion device 1 of this example includes a housing case 11 in which a capacitor 2, a reactor 3, and a positive electrode bus bar 4 are housed. The housing case 11 houses the negative electrode bus bar 5 for connecting the negative electrode terminal 22 of the capacitor 2 to the negative electrode of the DC power source 7 (see FIG. 11).

  A power connector insertion hole 111 is formed in the housing case 11. A connector (not shown) is inserted into the power connector insertion hole 111 and connected to the power connection terminals 43 and 53. Further, the connector and the DC power source 7 are connected using a power cable (not shown). In this way, the bus bars 4 and 5 are connected to the DC power source 7. The heat Q1 transmitted from the reactor 3 to the power connection terminal 43 is transmitted to the power cable and is radiated through the power cable.

  In addition, the positive electrode bus bar 4 and the negative electrode bus bar 5 are formed with other device connection terminals 44 and 54 for connection to another electronic device 8 (see FIG. 11). In this example, an in-vehicle air conditioner is used as the other electronic device 8.

  Further, as shown in FIG. 1, the housing case 11 has a connector insertion hole 112 for other devices. A connector (not shown) is inserted into the other device connector insertion hole 112 and connected to the other device connection terminals 44 and 54. Further, the other electronic device 8 and the connector are connected using a cable (not shown).

  As shown in FIG. 2, the terminals 21 and 22 of the capacitor 2 and the bus bars 4 and 5 are fastened to each other by bolts 36. Further, in the positive electrode bus bar 4, the length of the path L2 through which the heat Q2 is transmitted from the reactor connection terminal 42 to the capacitor connection terminal 41 is longer than the length of the path L1 through which the heat Q1 is transmitted from the reactor connection terminal 42 to the power supply connection terminal 43. ing.

  The plate thickness of the positive electrode bus bar 4 is the same at all locations. The positive bus bar 4 is formed with narrow portions (first narrow portion 45 and second narrow portion 46) in the middle of the path L2. In the positive electrode bus bar 4, the minimum cross-sectional area between the reactor connection terminal 42 and the power supply connection terminal 43 (cross-sectional area in the DD section of the power supply connection terminal 43: see FIG. 7) is from the reactor connection terminal 42 to the capacitor connection terminal 41. Larger than the minimum cross-sectional area (cross-sectional area in the CC cross section of the first narrow portion 45: see FIG. 6).

  As shown in FIG. 2, a U-shaped notch 47 is formed between the reactor connection terminal 42 and the first narrow portion 45 in the positive electrode bus bar 4. Therefore, the heat Q2 cannot move directly from the reactor connection terminal 42 to the first narrow portion 45, and once moves in a direction away from the capacitor 2, it makes a U-turn and moves to the first narrow portion 45. It will be. As a result, the length of the path L2 through which the heat Q2 is transmitted is made longer.

  Further, part of the heat Q (heat Q 3) transmitted from the reactor 3 to the positive electrode bus bar 4 is transmitted to the other device connection terminal 44. A second narrow portion 46 is provided between the other device connection terminal 44 and the capacitor connection terminal 41, and the cross-sectional area of the other device connection terminal 44 is larger than the cross-sectional area of the second narrow portion 46. large. Therefore, more heat is transmitted to the other device connection terminal 44. That is, the amount of heat Q3 transmitted to the other device connection terminal 44 is larger than the amount of heat Q2 transmitted to the capacitor connection terminal 41.

  On the other hand, as shown in FIGS. 3 and 4, the reactor 3 includes a ring-shaped core 30. The surface of the core 30 is covered with an insulating resin body 35. The electromagnetic coil 31 is wound around the insulating resin body 35.

  As shown in FIG. 3, the electromagnetic coil 31 includes two coils, a first coil 31a and a second coil 31b. One end 311 of the first coil 31a and one end 312 of the second coil 31b are welded to each other. The other end 313 of the first coil 31a is connected to a semiconductor module 6 described later by a connection member (not shown). The other end 314 of the second coil 31b is connected to the reactor connection terminal 42 of the positive bus bar 4 (see FIG. 2).

  Two nuts 34 are inserted into the insulating resin body 35. As shown in FIG. 10, the positive electrode terminal 21 and the positive electrode bus bar 4 of the capacitor 2 are superposed, fastened using a bolt 36, and screwed into a nut 34. Thus, a part of the insulating resin body 35 serves as a terminal block 33 for fastening the positive electrode terminal 21 and the positive electrode bus bar 4 to each other.

  As shown in FIG. 2, the electromagnetic coil 31 is interposed between the capacitor connection terminal 41 and the reactor connection terminal 42 when viewed from the plate thickness direction (Z direction) of the positive electrode bus bar 4. That is, in this example, the capacitor connection terminal 41 and the reactor connection terminal 42 are moved away from each other as the electromagnetic coil 31 is interposed therebetween.

  The insulating resin body 35 has a non-winding portion 300 around which the electromagnetic coil 31 is not wound. The non-winding portion 300 is interposed between the capacitor 2 and the electromagnetic coil 31.

  On the other hand, as shown in FIG. 9, the capacitor 2 includes a capacitor case 25, a capacitor element 23 accommodated in the capacitor case 25, and a sealing member 26 that seals the capacitor element 23. As the capacitor element 23, for example, a film capacitor is used. Metal plates 210 and 220 are connected to the electrode surfaces 231 and 232 of the capacitor element 23, respectively. Of the two metal plates 210 and 220, one metal plate 210 is connected to the positive electrode terminal 21, and the other metal plate 220 is connected to the negative electrode terminal 22.

  As shown in FIG. 8, a plurality of capacitor elements 23 are accommodated in the capacitor case 25. Among the plurality of capacitor elements 23, a part of the capacitor elements 23 constitutes the capacitor 2. The other capacitor element 23 constitutes a smoothing capacitor 24 described later. Thus, in this example, the capacitor 2 and the smoothing capacitor 24 are formed in one capacitor case 25.

  The metal plate 220 described above is commonly connected to the negative electrode surface 232 of all the capacitor elements 23. The capacitor element 23 constituting the capacitor 2 and the capacitor element 23 constituting the smoothing capacitor 24 are provided with separate metal plates 210 and 230 on the positive electrode surface 231.

  Further, as shown in FIG. 1, in this example, a stacked body 10 in which a plurality of semiconductor modules 6 incorporating semiconductor elements 63 (see FIG. 11) and a plurality of cooling pipes for cooling the semiconductor modules 6 are stacked is accommodated. It is housed in the case 11. As shown in FIG. 5, each individual semiconductor module 6 includes a main body portion 60 in which a semiconductor element 63 is sealed, and a power terminal 61 and a control terminal 62 protruding from the main body portion 60.

  The power terminal 61 includes a positive power terminal 61a connected to the positive electrode surface 231 of the smoothing capacitor 24, a negative power terminal 61b connected to the negative electrode surface 232 of the smoothing capacitor 24, and an AC load 70 (FIG. 11). And an AC power terminal 61c connected to the reference. The control circuit board 17 is connected to the control terminal 62. By controlling the switching operation of the semiconductor element 63 by the control circuit formed on the control circuit board 17, the DC voltage applied between the positive power terminal 61a and the negative power terminal 61b is converted into an AC voltage, Output from the AC power terminal 61c.

  As shown in FIGS. 1 and 4, the support wall portion 15 protrudes from the bottom wall 115 of the housing case 11. An elastic member 16 (leaf spring) is interposed between the support wall portion 15 and the laminated body 10. The laminated body 10 is pressed toward the side wall 116 of the housing case 11 using the elastic force of the elastic member 16. Thereby, the laminated body 10 is fixed in the housing case 11 while ensuring a contact pressure between the semiconductor module 6 and the cooling pipe 12.

  As shown in FIG. 1, the plurality of cooling pipes 12 are connected at both ends by connecting pipes 19. In addition, among the plurality of cooling pipes 12, the cooling pipe 12 a that contacts the side wall 116 includes an introduction pipe 13 for introducing the refrigerant 18 into the cooling pipe 12 and a derivation for deriving the refrigerant 18 from the cooling pipe 12. A pipe 14 is attached. When the refrigerant 18 is introduced from the introduction pipe 13, the refrigerant 18 flows through all the cooling pipes 12 through the connection pipe 19 and is led out from the lead-out pipe 14. Thereby, the semiconductor module 6 is cooled.

  Next, the circuit of the power conversion device 1 of this example will be described. As shown in FIG. 11, a booster circuit 75 and an inverter circuit 76 are formed in the power conversion device 1 of this example. The booster circuit 75 has a capacitor 2, a reactor 3, and a plurality of semiconductor elements 63 (IGBT elements). The positive electrode terminal 21 and the reactor 3 of the capacitor 2 are connected to the positive electrode of the DC power source 7 via the positive electrode bus bar 4. Further, the negative terminal 22 of the capacitor 2 is connected to the negative electrode of the DC power source 7 via the negative bus bar 5. The positive electrode bus bar 4 and the negative electrode bus bar 5 are connected to another electronic device 8 (vehicle air conditioner).

  As shown in FIG. 11, in the booster circuit 75, two semiconductor elements 63 (an upper arm semiconductor element 63a and a lower arm semiconductor element 63b) are connected in series. The upper arm semiconductor element 63a and the lower arm semiconductor element 63b are sealed in one semiconductor module 6 (see FIG. 1). By switching the lower arm semiconductor element 63b, the voltage of the DC power source 7 is boosted using the self-induction of the reactor 3.

  The inverter circuit 76 includes a plurality of semiconductor elements 63 and the smoothing capacitor 24. The smoothing capacitor 24 smoothes the DC voltage boosted by the booster circuit 75. Similarly to the booster circuit 75, the semiconductor element 63 has an upper arm semiconductor element 63a and a lower arm semiconductor element 63b connected in series. By switching these semiconductor elements 63, the boosted DC voltage is converted into an AC voltage, and the AC load 70 (three-phase AC motor) is driven.

  The effect of this example will be described. As shown in FIG. 2, in this example, a reactor connection terminal 42, a capacitor connection terminal 41, and a power supply connection terminal 43 are formed on the positive electrode bus bar 4. The heat Q1 transferred from the reactor 3 to the positive bus bar 4 through the reactor connection terminal 42 and transferred to the power supply connection terminal 43 is larger than the heat Q2 transferred to the capacitor connection terminal 41. did. If it does in this way, it can suppress that the heat | fever Q which moved to the positive electrode bus bar 4 from the reactor 3 is transmitted to the capacitor | condenser 2 through the capacitor | condenser connection terminal 41. FIG. Therefore, the temperature rise of the capacitor 2 can be suppressed, and the deterioration of the capacitor 2 can be prevented.

  In this example, since the reactor connection terminal 42, the capacitor connection terminal 41, and the power supply connection terminal 43 are formed in one bus bar (positive bus bar 4), the positive electrode of the DC power source 7, the reactor 3 and the capacitor 2 are connected to each other. Can be connected by two bus bars. Therefore, it is not necessary to use a plurality of bus bars to connect them, and the number of parts of the power conversion device 1 can be reduced. Thereby, the manufacturing cost of the power converter device 1 can be reduced.

Moreover, in this example, in the positive electrode bus bar 4, the minimum cross-sectional area between the reactor connection terminal 42 and the power supply connection terminal 43 (cross-sectional area in the DD cross section of the power supply connection terminal 43: see FIG. 7) is the reactor connection terminal. It is larger than the minimum cross-sectional area between 42 and the capacitor connection terminal 41 (cross-sectional area in the CC cross section of the first narrow width portion 45: see FIG. 6).
In this way, the heat of the reactor 3 can be reliably guided to the power connection terminal 43. That is, the heat of the reactor 3 is more easily transmitted through a path having a larger minimum cross-sectional area. Therefore, with the above configuration, the heat of the reactor 3 is likely to travel along a path having a larger minimum cross-sectional area, that is, a path L1 from the reactor connection terminal 42 to the power supply connection terminal 43. Therefore, the heat of the reactor 3 can be reliably guided to the power connection terminal 43.

In this example, as shown in FIG. 2, the length of the path L <b> 2 until the heat Q <b> 2 is transmitted from the reactor connection terminal 42 to the capacitor connection terminal 41 is the length until the heat Q <b> 1 is transmitted from the reactor connection terminal 42 to the power supply connection terminal 43. It is longer than the length of the path L1.
In this way, since the path L2 is long, heat can be dissipated to the surroundings while traveling along the path L2. Therefore, the amount of heat Q2 transmitted to the capacitor 2 can be further reduced.

Further, in this example, of the heat Q generated from the reactor 3 and moved to the positive bus bar 4 through the reactor connection terminal 42, the amount of heat Q3 transmitted to the other device connection terminal 44 is heat Q2 transmitted to the capacitor connection terminal 41. Greater than the amount.
In this way, a lot of heat can be transmitted to the other device connection terminal 44. Therefore, the amount of heat transmitted to the capacitor connection terminal 41 can be further reduced.

Further, as shown in FIG. 2, the insulating resin body 35 of the reactor 3 has a non-winding portion 300 around which the electromagnetic coil 31 is not wound. The non-winding portion 300 is interposed between the capacitor 2 and the electromagnetic coil 31.
If it does in this way, it will become easy to suppress the temperature rise of the capacitor | condenser 2 more. That is, the electromagnetic coil 31 of the reactor 3 easily generates heat, but the core 30 hardly generates heat. With the above configuration, the core 30 (non-winding portion 300) that does not easily generate heat can be disposed in the vicinity of the capacitor 2, and the heat generating electromagnetic coil 31 can be moved away from the capacitor 2. Therefore, the radiant heat transmitted from the electromagnetic coil 31 to the capacitor 2 can be reduced.

In this example, as shown in FIG. 2, the electromagnetic coil 31 is interposed between the capacitor connection terminal 41 and the reactor connection terminal 42 when viewed from the Z direction.
If it does in this way, it will become possible to keep the capacitor | condenser connection terminal 41 and the reactor connection terminal 42 away. Therefore, it becomes easy to radiate heat until the heat of the reactor 3 moves from the reactor connection terminal 42 to the capacitor connection terminal 41. Thereby, the amount of heat Q2 transmitted to the capacitor 2 can be further reduced.

As shown in FIGS. 2 and 10, a terminal block 33 for fastening the positive electrode terminal of the capacitor 2 and the capacitor connection terminal 41 to each other is formed on the insulating resin body 32.
In this way, since the terminal block 33 can be formed on the insulating resin body 32 for insulating the core 30 and the electromagnetic coil 31, it is not necessary to make the terminal block 33 a separate component. Thereby, a number of parts can be reduced and it becomes possible to reduce the manufacturing cost of the power converter device 1. FIG.

Further, as shown in FIG. 2, the positive electrode bus bar 4 is formed separately from the insulating resin body 32.
If it does in this way, since the positive electrode bus bar 4 can be exposed from the insulating resin body 32, it will become easy to radiate | emit the heat | fever of the reactor 3 more. Therefore, the amount of heat Q2 transmitted to the capacitor 2 can be further reduced.

In this example, the negative terminal 22 of the capacitor 2 and the negative bus bar 5 are fastened at the terminal block 33 formed on the insulating resin body 32.
In this way, there is no need to provide a dedicated terminal block 33 for fastening the negative electrode bus bar 5. Therefore, the number of parts can be reduced, and the manufacturing cost of the power conversion device 1 can be reduced.

In this example, as shown in FIG. 2, a U-shaped notch 47 is formed between the reactor connection terminal 42 and the first narrow width portion 45.
If it does in this way, the heat transmitted from the reactor 3 to the reactor connection terminal 42 will once move to the direction away from a capacitor | condenser, and will be U-turned after that and will be transmitted to the 1st narrow part 45. FIG. Therefore, the length of the path L2 through which the heat Q2 is transmitted can be made longer, and heat can be easily radiated.

  As described above, according to this example, it is possible to provide a power conversion device that can easily suppress the temperature rise of the capacitor.

DESCRIPTION OF SYMBOLS 1 Power converter 2 Capacitor 3 Reactor 4 Positive electrode bus bar 41 Capacitor connection terminal 42 Reactor connection terminal 43 Power supply connection terminal 7 DC power supply

Claims (11)

A capacitor that removes noise contained in the voltage of the DC power supply;
A reactor for transforming the voltage of the DC power source,
A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
Of the heat transferred to the positive electrode bus bar generated from the reactor through the reactor connection terminals, the amount of heat transferred to the power connection terminals are configured to be larger than the amount of heat transferred to the capacitor connecting terminal ,
In the positive electrode bus bar, the minimum cross-sectional area between the reactor connection terminal and the power supply connection terminal is larger than the minimum cross-sectional area between the reactor connection terminal and the capacitor connection terminal. .   A capacitor that removes noise contained in the voltage of the DC power supply;
  A reactor for transforming the voltage of the DC power source,
  A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
  The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
  Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power connection terminal is configured to be greater than the amount of heat transferred to the capacitor connection terminal. ,
  The length of a path through which the heat is transferred from the reactor connection terminal to the capacitor connection terminal is longer than a length of a path through which the heat is transferred from the reactor connection terminal to the power supply connection terminal.   A capacitor that removes noise contained in the voltage of the DC power supply;
  A reactor for transforming the voltage of the DC power source,
  A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
  The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
  Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power connection terminal is configured to be greater than the amount of heat transferred to the capacitor connection terminal. ,
  The positive electrode bus bar includes another device connection terminal for connecting to another electronic device, and is transmitted to the other device connection terminal out of heat generated from the reactor and transferred to the positive electrode bus bar through the reactor connection terminal. A power conversion device, characterized in that the amount of heat is greater than the amount of heat transmitted to the capacitor connection terminal.   A capacitor that removes noise contained in the voltage of the DC power supply;
  A reactor for transforming the voltage of the DC power source,
  A positive electrode bus bar connecting the reactor and the capacitor to the positive electrode of the DC power supply,
  The positive electrode bus bar has a capacitor connection terminal connected to the capacitor, a reactor connection terminal connected to the reactor, and a power supply connection terminal for connection to the DC power source,
  Of the heat generated from the reactor and transferred to the positive bus bar through the reactor connection terminal, the amount of heat transferred to the power connection terminal is configured to be greater than the amount of heat transferred to the capacitor connection terminal. ,
  The reactor includes a core made of a soft magnetic material and an electromagnetic coil wound around a part of the core, and the core has a non-winding portion around which the electromagnetic coil is not wound. A power conversion device, wherein a winding portion is interposed between the capacitor and the electromagnetic coil.   2. The power conversion device according to claim 1, wherein a length of a path through which the heat is transmitted from the reactor connection terminal to the capacitor connection terminal is longer than a length of a path through which the heat is transmitted from the reactor connection terminal to the power connection terminal. Power converter characterized by being long.   The power converter according to any one of claims 1, 2, and 5, wherein the positive electrode bus bar includes another device connection terminal for connecting to another electronic device, and is generated from the reactor and the reactor connection terminal. Of the heat transferred to the positive electrode bus bar through the heat transfer device, the amount of heat transferred to the other device connection terminal is larger than the amount of heat transferred to the capacitor connection terminal. .   7. The power converter according to claim 1, wherein the reactor includes a core made of a soft magnetic material and an electromagnetic coil wound around a part of the core. The power converter according to claim 1, wherein the core includes a non-winding portion around which the electromagnetic coil is not wound, and the non-winding portion is interposed between the capacitor and the electromagnetic coil.   8. The power converter according to claim 4, wherein the electromagnetic coil is interposed between the capacitor connection terminal and the reactor connection terminal when viewed from the thickness direction of the positive bus bar. A power converter.   9. The power conversion device according to claim 4, wherein a surface of the core is covered with an insulating resin body, the electromagnetic coil is wound around the insulating resin body, and the capacitor A terminal block for fastening the positive electrode terminal and the capacitor connection terminal of the positive electrode bus bar to each other is formed on the insulating resin body.   10. The power converter according to claim 9, wherein the positive electrode bus bar is formed separately from the insulating resin body.   11. The power conversion device according to claim 9, further comprising a negative electrode bus bar connecting the negative electrode of the DC power supply and the capacitor, wherein the negative electrode terminal of the capacitor and the negative electrode bus bar are fastened at the terminal block. There is a power converter characterized by being.

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