JP5151466B2 - Power conversion device and electrical component connection method - Google Patents

Description

  The present invention relates to a power converter and a method for connecting electrical components, and is particularly suitable when applied to the structure of a connection portion of electrical components of a power converter.

In order to convert input power obtained from a commercial AC power source into power of a predetermined frequency by a semiconductor switching element and output the power, a power conversion device such as an inverter is used.
Here, in the power converter, since a wiring inductance exists between the smoothing capacitor of the DC circuit and the semiconductor switching element, a voltage jump occurs with a change in current during switching.
FIG. 9 is a diagram showing a three-phase circuit configuration of a power conversion device to which an IGBT (Insulated Gate Bipolar Transistor) is applied as a switching element.

In FIG. 9, feedback diodes D1 to D6 are connected in antiparallel to switching elements Q1 to Q6, switching elements Q1 and Q2 are connected in series, switching elements Q3 and Q4 are connected in series, and switching elements Q5, Q6 are connected in series with each other. Here, a connection point between switching elements Q1 and Q2 is provided with a U-phase AC terminal AC (U) that outputs a U-phase voltage, and a connection point between switching elements Q3 and Q4 is a V that outputs a V-phase voltage. A phase AC terminal AC (V) is provided, and a V-phase AC terminal AC (W) for outputting a W-phase voltage is provided at a connection point between the switching elements Q5 and Q6, and the switching elements Q1 and Q2 connected in series are connected. At both ends, a DC power source positive terminal P and a DC power source negative terminal N are provided.
The switching elements Q1 and Q2 connected in series, the switching elements Q3 and Q4 connected in series, and the switching elements Q5 and Q6 connected in series are connected in parallel to each other and connected to the switching elements Q1 and Q2 connected in series. The smoothing capacitor C and the power supply Ed are connected in parallel.

FIG. 10 is a diagram illustrating a circuit configuration for one phase of a power conversion device in which an IGBT is applied to the switching element, and FIG. 11 is a diagram illustrating a circuit configuration of the IGBT of FIG.
In FIG. 10, feedback diodes D1 and D2 are connected in antiparallel to switching elements Q1 and Q2, respectively, and switching elements Q1 and Q2 are connected in series with each other. Here, an AC terminal AC is provided at a connection point of the switching elements Q1 and Q2, and a DC power source positive terminal P and a DC power source negative terminal N are respectively connected to both ends of the switching elements Q1 and Q2 connected in series. Is provided. A smoothing capacitor C is connected in parallel to the switching elements Q1 and Q2 connected in series.

As shown in FIG. 11, the IGBT used as the switching element Q1 is provided with a collector terminal C as a high potential side terminal and an emitter terminal E as a low potential side terminal, and receives a control signal for performing a switching operation. A gate terminal G and an auxiliary emitter terminal Es are provided.
Here, in the power converter, the positive electrode CP of the smoothing capacitor C and the switching element Q1 are connected via the wiring 101, and the switching elements Q1 and Q2 and the AC terminal AC are connected via the wiring 201, and the smoothing capacitor The negative electrode C-N of C and the switching element Q2 are connected via a wiring 301.

A wiring inductance exists on the path of the smoothing capacitor C → the wiring 101 → the switching element Q1 → the wiring 201 → the switching element Q2 → the wiring 301 → the smoothing capacitor C.
When a voltage jump occurs with a change in current during switching, the voltage is added to the DC voltage and applied to the switching elements Q1 and Q2. When the value exceeds the voltage rating of the switching elements Q1 and Q2, the switching elements Q1 and Q2 are destroyed.

In order to avoid such a phenomenon, as a method of suppressing the jump of the voltage accompanying the change of the current at the time of switching, a method of reducing the wiring inductance, a method of reducing the current flowing through the switching elements Q1 and Q2, and the like can be considered. .
In the method of reducing the current flowing through the switching elements Q1 and Q2, the capacity of the power conversion device is reduced, which causes an increase in cost. For this reason, it is usual to reduce the jumping of the voltage accompanying the change in current during switching by reducing the wiring inductance. A snubber circuit can be installed as a method to suppress the voltage jump caused by the change in current during switching. However, because a semiconductor element, resistor, capacitor, etc. are required separately, the power converter becomes large and expensive. It becomes a factor that causes

  On the other hand, as a method of reducing the wiring inductance, the current increases at the time of switching turn-off on the path of the smoothing capacitor C → the wiring 101 → the switching element Q1 → the wiring 201 → the switching element Q2 → the wiring 301 → the smoothing capacitor C. There is a method of canceling out the inductance component by arranging a pair of wirings where current is reduced when switching is turned off (Patent Document 1).

  Specifically, it is assumed that the switching element Q1 is turned on and a current is flowing to the load via the path K1 of the smoothing capacitor C → the wiring 101 → the switching element Q1 → the wiring 201 → the AC terminal AC. When the switching element Q1 is turned off from this state, the current flowing through the path K1 decreases. At this time, the voltage due to the inductance of the wiring 101 generated along with the current change is generated in a direction in which the switching element Q1 is higher than the smoothing capacitor C.

On the other hand, when the switching element Q1 is turned off, the current flowing through the path K2 of the smoothing capacitor C → the wiring 301 → the switching element Q2 → the wiring 201 → the AC terminal AC increases. For this reason, the voltage due to the inductance of the wiring 301 generated with the current change is generated in a direction in which the smoothing capacitor C is higher than the switching element Q2.
That is, when the switching element Q1 is turned off, the wiring 101 and the wiring 301 have different current change directions and different magnetic flux directions.

For this reason, by arranging the wirings 101 and 301 in pairs, the magnetic flux generated when the switching element Q1 is turned off can be canceled and the inductance component can be canceled. It is possible to suppress the jumping of the voltage accompanying the change.
In addition, by arranging the wiring 201 in combination with one or both of the wirings 101 and 301, the inductance component can be canceled and the wiring inductance can be reduced.

12A is a plan view showing a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device, and FIG. 12B is a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device. FIG. 13 is an exploded perspective view showing a schematic configuration of the multilayer wiring conductor of FIG. 12, and FIG. 14 is a diagram showing a circuit configuration of the power conversion device of FIG.
12-14, the power converter device is provided with switching elements Q1a-Q1c, Q2a-Q2c and capacitors C1, C2 to which feedback diodes D1a-D1c, D2a-D2c are respectively connected in antiparallel. Switching elements Q1a to Q1c and Q2a to Q2c are arranged on heat sink 6, and switching elements Q1a to Q1c, Q2a to Q2c and capacitors are provided on switching elements Q1a to Q1c, Q2a to Q2c and capacitors C1 and C2. Conductive flat plates 3b, 4b, 5b and insulating plates 20b to 23b used for connecting C1 and C2 are arranged.

Here, the conductor flat plate 3b is provided with the DC positive terminal P, and the conductor collars C1-P and C2-P for connecting the positive terminals of the capacitors C1 and C2 and the collector terminals C of the switching elements Q1a to Q1c, respectively. Conductor collars Q1a-C to Q1c-C to be connected are provided, and a through hole 3a through which a fixing part such as a bolt for fixing the conductor flat plate 3b is passed is formed.
The conductor flat plate 4b is provided with a DC negative electrode terminal N, and is connected with conductor collars C1-N and C2-N for connecting the negative terminals of the capacitors C1 and C2, respectively, and the emitter terminals E of the switching elements Q2a to Q2c. Conductor collars Q2a-E to Q2c-E are provided, and a through hole 4a is formed through which a fixing component such as a bolt for fixing the conductor flat plate 4b is passed.

  The conductor flat plate 5b is provided with an AC terminal AC, and is provided with conductor collars Q1a-E to Q1c-E and collector terminals C of the switching elements Q2a to Q2c for connecting the emitter terminals E of the switching elements Q1a to Q1c, respectively. Conductor collars Q2a-C to Q2c-C to be connected are provided, and a through hole 5a is formed through which a fixing component such as a bolt for fixing the conductor flat plate 5b is passed.

Furthermore, through holes 20a to 23a through which fixing parts such as bolts for fixing the insulating plates 20b to 23b are passed are formed in the insulating plates 20b to 23b, respectively.
Then, the insulating plate 23b, the conductive plate 5b, the insulating plate 21b, the conductive plate 4b, the insulating plate 22b, the conductive plate 3b, and the insulating plate 20b are sequentially stacked on the switching elements Q1a to Q1c, Q2a to Q2c and the capacitors C1 and C2. The collector terminals C of the switching elements Q1a to Q1c are connected to the DC positive terminal P and the positive terminals of the capacitors C1 and C2, and the emitter terminals E of the switching elements Q2a to Q2c are connected to the DC negative terminal N and the negative terminals of the capacitors C1 and C2. The emitter terminals E of the switching elements Q1a to Q1c and the collector terminals C of the switching elements Q2a to Q2c can be connected to the AC terminal AC.

The insulating plate 23b, the conductor flat plate 5b, the insulating plate 21b, the conductor flat plate 4b, the insulating plate 22b, the conductor flat plate 3b, and the insulating plate 20b are sequentially stacked, so that the switching elements Q1a to Q1c, Q2a to Q2c and the capacitors C1, C2 In addition to shortening the wiring distance between the switching elements Q1a to Q1c, the electromagnetic coupling for canceling the magnetic flux generated when the switching elements Q1a to Q1c are turned off can be strengthened, and the wiring inductance can be reduced. Therefore, it is possible to suppress a voltage jump accompanying a change in current during switching.
In addition to the circuit configuration for three phases in FIG. 14, the concept is the same for the circuit configuration for one phase in FIG.
Japanese Patent Laid-Open No. 8-019245

  However, in the configuration of FIG. 12, the switching elements Q1a to Q1c and Q2a to Q2c and the capacitors C1 and C2 are connected by using a plurality of conductor plates 3b, 4b, and 5b and insulating plates 20b to 23b and overlapping each other. Done. In order to reliably and easily connect the switching elements Q1a to Q1c, Q2a to Q2c and the capacitors C1 and C2, the electrode surfaces of the switching elements Q1a to Q1c, Q2a to Q2c and the capacitors C1 and C2, conductors Conductor collars Q2a-E to Q2c-E, Q2a-C to Q2c-C, Q1a-E to Q1c-E, and Q2a-C to Q2c- which secure intervals for matching the flat surfaces of the flat plates 3b, 4b and 5b C is integrally formed on the conductor flat plates 3b, 4b, and 5.

For this reason, in addition to requiring complicated processing for the production of the conductor flat plates 3b, 4b, 5b and the insulating plates 20b-23b, when assembling the conductor flat plates 3b, 4b, 5b and the insulating plates 20b-23b, There is a problem that a large apparatus including a mold for mounting and fixing is required, which requires a large amount of cost and labor, and also causes an increase in parts cost and a prolonged production period.
SUMMARY OF THE INVENTION An object of the present invention is to provide a power conversion device and an electrical component connection method that can reduce the wiring inductance of a connection portion of an electrical component without subjecting the wiring component to complicated processing.

In order to solve the above-described problem, according to the power conversion device of claim 1, the first switching element provided with the first low potential side terminal and the first high potential side terminal, and the second A low potential side terminal and a second high potential side terminal, the second high potential side terminal is disposed adjacent to the first low potential side terminal, and the second low potential side terminal is provided. A second switching element disposed such that a side terminal is adjacent to the first high potential side terminal, a DC positive terminal and a DC negative terminal are provided, and the DC positive terminal is the first high potential side; A smoothing capacitor disposed adjacent to the terminal and having the DC negative electrode terminal disposed adjacent to the second low potential side terminal, and a first external connection electrode terminal, wherein the first low potential side is formed. A first wiring conductor connecting the terminal and the second high potential side terminal; A connection electrode terminal is formed, a second wiring conductor connecting the first high potential side terminal and the DC positive electrode terminal, a third external connection electrode terminal is formed, and the second low connection terminal is formed. And a third wiring conductor connecting the potential side terminal and the DC negative electrode terminal, and at least the second and third wiring conductors are formed with bent portions arranged to face each other . The wiring conductor is composed of a flat conductor configured such that a portion connected to the terminal of the switching element is folded inward, and the second and third wiring conductors include the switching element and the smoothing capacitor. A portion connected to the terminal is formed of a flat conductor configured to be folded inward .

Further, according to the power converter according to claim 2, wherein said first wiring conductor, said first portion connected to the low potential side terminal becomes parallel to the first electrode terminal for external connection The first high potential side terminal is bent in the opposite direction, and the portion connected to the second high potential side terminal is parallel to the first external connection electrode terminal. The second flat plate conductor is bent in the direction opposite to the second low potential side terminal, and the second wiring conductor is connected to the first high potential side terminal. Are bent in a direction opposite to the first low potential side terminal so as to be parallel to the external connection electrode terminal, and a portion connected to the DC positive electrode terminal is connected to the second external connection electrode terminal. Bend in the opposite direction to the DC negative terminal to be parallel The third wiring conductor is configured such that the portion connected to the second low potential side terminal is parallel to the third external connection electrode terminal. A direction opposite to the DC positive electrode terminal so that the portion connected to the DC negative electrode terminal is parallel to the third external connection electrode terminal while being bent in the opposite direction to the second high potential side terminal It is characterized by being comprised from the 3rd flat plate conductor bent by.

According to the power conversion device of claim 3 , the first switching element provided with the first low potential side terminal and the first high potential side terminal, the second low potential side terminal and the first low potential side terminal 2 high potential side terminals, the second high potential side terminal is disposed adjacent to the first low potential side terminal, and the second low potential side terminal is the first low potential side terminal. A second switching element disposed adjacent to the high potential side terminal and a first external connection electrode terminal are formed, and the first low potential side terminal and the second high potential side terminal are connected to each other. A first wiring conductor to be connected and a second external connection electrode terminal are formed, and a second wiring conductor connected to the first high potential side terminal and a third external connection electrode terminal are formed. And a third wiring conductor connected to the second low potential side terminal, at least the second and second Configuration The wiring conductors, as has bent portions which are opposed to each other are formed respectively, a third wiring conductor from the first, the terminal and the portion to be connected of said switching element is folded inwardly It is characterized by comprising a flat plate conductor .

Also, according to the power converter according to claim 4, wherein said first wiring conductor, said first portion connected to the low potential side terminal, in parallel with said first external connection electrode terminal The first high potential side terminal is bent in the opposite direction, and the portion connected to the second high potential side terminal is parallel to the first external connection electrode terminal. The second flat plate conductor is bent in the direction opposite to the second low potential side terminal, and the second wiring conductor has a portion connected to the first high potential side terminal. 2, a second flat conductor bent in a direction opposite to the first low-potential side terminal so as to be parallel to the external connection electrode terminal, and the third wiring conductor includes the second wiring conductor The portion connected to the low potential side terminal is parallel to the third external connection electrode terminal. Characterized in that it is composed of a third flat conductor which is bent in the opposite direction as the second high-potential-side terminal so that.

According to the electrical component connection method of claim 5 , the first switching element provided with the first low potential side terminal and the first high potential side terminal, and the second low potential side terminal And a second switching element provided with a second high potential side terminal, the second high potential side terminal adjacent to the first low potential side terminal, and the second low potential side A step of disposing the terminal adjacent to the first high potential side terminal; and a smoothing capacitor provided with a direct current positive terminal and a direct current negative electrode terminal; and the direct current positive terminal serving as the first high potential side terminal. Arranging the DC negative electrode terminal adjacent to the second low potential side terminal, and the first low potential side terminal and the second high potential side terminal to the first external A step of connecting with a first wiring conductor in which a connection electrode terminal is formed; and the first high potential side A step of connecting the child and the DC positive electrode terminal with a second wiring conductor having a second external connection electrode terminal formed thereon; and a third wiring conductor having a third external connection electrode terminal formed therein. A step of connecting the second low potential side terminal and the DC negative electrode terminal with the third wiring conductor while arranging the second wiring conductor in parallel with the second wiring conductor, and at least the second and third The wiring conductor is formed with bent portions that are arranged to face each other , and the first wiring conductor is formed from a flat conductor configured such that a portion connected to the terminal of the switching element is folded inward. is configured, the second and third wiring conductor is to be composed of configured flat conductor so that the terminal and the portion to be connected to each of said switching element and the smoothing capacitor are folded inwardly And features.

According to the electrical component connecting method of claim 6 , the first switching element provided with the first low potential side terminal and the first high potential side terminal, and the second low potential side terminal And a second switching element provided with a second high potential side terminal, the second high potential side terminal adjacent to the first low potential side terminal, and the second low potential side A step of disposing the terminal adjacent to the first high potential side terminal, and a first wiring conductor on which the first external connection electrode terminal is formed, and the first low potential side terminal and the first A step of connecting the second high potential side terminal, a step of connecting the second wiring conductor on which the second external connection electrode terminal is formed to the first high potential side terminal, and a third external connection The third wiring conductor in which the electrode terminal for the electrode is formed is arranged in parallel with the second wiring conductor, and the third wiring conductor is placed in front. And a step of connecting to a second low-potential-side terminals, at least the the second and third wiring conductors are formed respectively bent portion disposed opposite to each other, the third wire from the first The conductor is composed of a flat conductor configured such that portions respectively connected to the terminals of the switching element are folded inward .

  As described above, according to the present invention, when the switching element is connected to the second and third wiring conductors, the second and third wiring conductors are formed with the bent portions arranged to face each other. In addition, a part of the second and third wiring conductors can be disposed facing each other without arranging the second and third wiring conductors one above the other, and the switching element and the smoothing capacitor The space | interval for making this electrode surface and the plane of a wiring conductor correspond can be ensured.

  For this reason, it is possible to cancel the inductance component existing between the switching element and the smoothing capacitor, it is possible to reduce the wiring inductance, and it is possible to reduce the switching element and the smoothing without applying complicated processing to the wiring conductor. Capacitors can be connected reliably and easily, and it is possible to suppress an increase in component costs and an increase in manufacturing period, and a special manufacturing apparatus can be dispensed with.

Hereinafter, a power converter according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a schematic configuration of a connecting portion of an electrical component in a power conversion device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 3 is an exploded perspective view showing a schematic configuration of a connecting portion of the electrical component in FIG. 1, and FIG. 4 is a perspective view showing the schematic configuration of the wiring conductor 341 in FIG.

1 to 4, switching elements Q <b> 1 and Q <b> 2 and a smoothing capacitor C are provided in the power conversion device. As the switching elements Q1 and Q2, for example, a power MOSFET can be used in addition to the IGBT.
Here, the switching elements Q1 and Q2 are respectively provided with a collector terminal C as a high potential side terminal and an emitter terminal E as a low potential side terminal. The smoothing capacitor C has a DC positive terminal CP and a DC negative terminal C. -N is provided.

  Switching elements Q1 and Q2 are arranged such that emitter terminal E of switching element Q1 is adjacent to collector terminal C of switching element Q2, and collector terminal C of switching element Q1 is adjacent to emitter terminal E of switching element Q2. Are arranged to be. The smoothing capacitor C is arranged so that the DC positive terminal CP is adjacent to the collector terminal C of the switching element Q1, and the DC negative terminal CN is adjacent to the emitter terminal E of the switching element Q2. ing.

  Further, the power converter is connected to the wiring conductor 141 connecting the collector terminal C of the switching element Q1 and the DC positive terminal CP of the smoothing capacitor C, the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2. The wiring conductor 241 to be connected, the wiring conductor 341 connecting the emitter terminal E of the switching element Q2 and the DC negative electrode terminal CN of the smoothing capacitor C, and the insulating material 441 for insulating the wiring conductors 141, 241, 341 from each other are provided.

Here, a DC power source positive terminal P is formed on the wiring conductor 141, an AC terminal AC is formed on the wiring conductor 241, and a DC power source negative terminal N is formed on the wiring conductor 341.
And the wiring conductor 141 can be comprised from the flat conductor folded inward by the part of the collector terminal C of the switching element Q1, and the direct current | flow positive electrode terminal CP of the smoothing capacitor C. FIG. Further, the wiring conductor 241 can be formed of a flat conductor that is folded inward at the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2. In addition, the wiring conductor 341 can be configured by a flat conductor that is folded outward at the emitter terminal E of the switching element Q2 and the DC negative electrode terminal CN of the smoothing capacitor C.

That is, the wiring conductor 141 is bent in a direction opposite to the emitter terminal E of the switching element Q1 so that the portion connected to the collector terminal C of the switching element Q1 is parallel to the DC power source positive side terminal P, and the direct current The portion connected to the positive electrode terminal CP can be composed of a flat conductor bent in a direction opposite to the DC negative electrode terminal CN so as to be parallel to the DC power source positive terminal P.
The wiring conductor 241 is bent in a direction opposite to the collector terminal C of the switching element Q1 so that the portion connected to the emitter terminal E of the switching element Q1 is parallel to the AC terminal AC, and the collector terminal of the switching element Q2 It can be composed of a flat conductor bent in a direction opposite to the emitter terminal E of the switching element Q2 so that the portion connected to C is parallel to the AC terminal AC.

The wiring conductor 341 is bent in the direction opposite to the collector terminal C of the switching element Q2 so that the portion connected to the emitter terminal E of the switching element Q2 is parallel to the DC power source negative terminal N, and the DC negative terminal The part connected to C-N can be comprised from the flat conductor bent in the direction opposite to DC positive terminal CP so that it may become parallel with DC power source negative side terminal N.
The wiring conductors 141 to 341 can be formed with bent portions that are arranged to face each other when the switching elements Q1 and Q2 and the smoothing capacitor C are connected by the wiring conductors 141 to 341, respectively.

  Specifically, the wiring conductor 141 is provided with conductor flat plate portions 141a to 141e, and a DC power source positive side terminal P is formed on the conductor flat plate portion 141a. Here, the length of the conductor flat plate portion 141a can be set to correspond to the distance between the collector terminal C of the switching element Q1 and the DC positive electrode terminal CP of the smoothing capacitor C. Further, the width of the conductor flat plate portion 141a can be set so as to correspond to the width of the switching element Q1 or the smoothing capacitor C.

The conductive flat plate portion 141a is connected to the end on the switching element Q1 side in the length direction so that the conductive flat plate portion 141b is perpendicular to the conductive flat plate portion 141a, and to the end of the conductive flat plate portion 141b. The conductor flat plate portion 141c is connected so as to face the conductor flat plate portion 141a, and a portion connected to the collector terminal C of the switching element Q1 is formed.
In addition, the conductive flat plate portion 141a is connected to the end on the smoothing capacitor C side in the width direction of the flat conductive plate portion 141a so that the flat conductive plate portion 141d is perpendicular to the flat conductive plate portions 141a and 141b. Are connected such that the conductor flat plate portion 141e faces the conductor flat plate portion 141a, and a portion connected to the DC positive electrode terminal CP of the smoothing capacitor C is formed.

  Further, the wiring conductor 241 is provided with conductor flat plate portions 241a to 241c, and an AC terminal AC is formed on the conductor flat plate portion 241a. Here, the length of the conductor flat plate portion 241a can be set to correspond to the distance from the component end surface of the switching element Q1 to the emitter terminal E and the distance from the component end surface of the switching element Q2 to the collector terminal C. . The width of the conductor flat plate portion 241a can be set to correspond to the distance between the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2.

  The conductor flat plate portion 241b is connected to the end of the conductor flat plate portion 241a on the switching element Q1, Q2 side in the length direction so that the conductor flat plate portion 241b is perpendicular to the conductor flat plate portion 241a. Are formed so that the conductor flat plate portion 241c is connected to face the conductor flat plate portion 241a, and a portion connected to the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 is formed.

  The wiring conductor 341 is provided with conductor flat plate portions 341a to 341e, and a DC power source negative terminal N is formed on the conductor flat plate portion 341a. Here, the length of the conductor flat plate portion 341a can be set so as to correspond to the distance between the emitter terminal E of the switching element Q2 and the DC negative electrode terminal CN of the smoothing capacitor C. Further, the width of the conductor flat plate portion 141a can be set so as to correspond to the width of the switching element Q2 and the smoothing capacitor C.

The conductor flat plate portion 341a is connected to the end on the switching element Q2 side in the length direction so that the conductor flat plate portion 341b is perpendicular to the conductor flat plate portion 341a. The conductor flat plate portion 341c is connected to face the conductive flat plate portion 341a, and a portion connected to the emitter terminal E of the switching element Q2 is formed.
In addition, the conductive flat plate portion 341a is connected to the end on the smoothing capacitor C side in the width direction of the flat conductive plate portion 341a so that the flat conductive plate portion 341d is perpendicular to the flat conductive plate portions 341a and 341b. Are connected so that the conductive flat plate portion 341e faces the conductive flat plate portion 341a, and a portion connected to the DC negative electrode terminal CN of the smoothing capacitor C is formed.

The insulating material 441 is provided with insulating flat plate portions 441a to 441c. The insulating flat plate portion 441a is configured to be inserted into a gap between the conductive flat plate portions 141b and 241b, and the insulating flat plate portion 441b is a conductive flat plate portion. The insulating flat plate portion 441c is configured to be inserted into the gap between the conductive flat plate portions 241b and 341b.
In order to secure a creeping distance necessary for insulation between the wiring conductor 141 and the wiring conductor 341, the width of the insulating material 441 may be wider than the width of the conductive flat plate portion 141b to the conductive flat plate portion 341b.

  The conductor flat plate portion 141c is in contact with the collector terminal C of the switching element Q1, and the conductor flat plate portion 141e is in contact with the DC positive electrode terminal CP of the smoothing capacitor C so that wiring is performed on the switching element Q1 and the smoothing capacitor C. A conductor 141 can be disposed. Then, by fixing the wiring conductor 141 to the switching element Q1 and the smoothing capacitor C with the fixing members 501a and 521a, the conductive flat plate portion 141b faces the conductive flat plate portion 241b, and the conductive flat plate portion 141d becomes the conductive flat plate portion 341d. The collector terminal C of the switching element Q1 and the DC positive terminal CP of the smoothing capacitor C can be connected so as to face each other.

  Further, the wiring conductor 241 can be disposed on the switching elements Q1, Q2 such that the conductor flat plate portion 241c contacts the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2. Then, by fixing the wiring conductor 241 to the switching elements Q1, Q2 with the fixing members 501b, 501c, the conductor flat plate portion 241b faces the conductor flat plate portions 141b, 341b, and the emitter terminal E of the switching element Q1. The collector terminal C of the switching element Q2 can be connected.

  Further, the conductor flat plate portion 341e is in contact with the emitter terminal E of the switching element Q2, and the conductor flat plate portion 341e is in contact with the DC negative electrode terminal CN of the smoothing capacitor C so that wiring is performed on the switching element Q2 and the smoothing capacitor C. A conductor 341 can be disposed. Then, by fixing the wiring conductor 341 to the switching element Q2 and the smoothing capacitor C with the fixing members 501d and 521b, the conductive flat plate portion 341b faces the conductive flat plate portion 241b, and the conductive flat plate portion 341d becomes the conductive flat plate portion 141d. The emitter terminal E of the switching element Q2 and the DC negative terminal C-N of the smoothing capacitor C can be connected so as to face each other.

For example, screws and bolts can be used as the fixing members 501a to 501d, 521a, and 521b.
Here, in the path K1 in FIG. 10, the DC positive electrode terminal CP of the smoothing capacitor C → the conductive flat plate portion 141e → the conductive flat plate portion 141d → the conductive flat plate portion 141b → the conductive flat plate portion 141c → the collector terminal C of the switching element Q1 → switching. A current can flow in the order of the emitter terminal E of the element Q1, the conductive flat plate portion 241c, the conductive flat plate portion 241b, the conductive flat plate portion 241a, and the AC terminal AC.

  On the other hand, in the path K2 of FIG. 10, the DC negative electrode terminal CN of the smoothing capacitor C → the conductive flat plate portion 341e → the conductive flat plate portion 341d → the conductive flat plate portion 341b → the conductive flat plate portion 341c → the emitter terminal E of the switching element Q2 → the switching element. A current can flow in the order of collector terminal C of Q2, conductive flat plate portion 241c, conductive flat plate portion 241b, conductive flat plate portion 241a, and AC terminal AC.

Then, it is assumed that the switching element Q1 is turned on and a current flows through the load via the path K1 in FIG. When the switching element Q1 is turned off from this state, the current flowing through the path K1 decreases and the current flowing through the path K2 increases. For this reason, when the switching element Q1 is turned off, the direction of the current change can be made different between the wiring conductors 141 to 341, and the direction of the magnetic flux can be made different.
As a result, the magnetic flux generated when the switching element Q1 is turned off can be canceled out between the wiring conductors 141 to 341, and the inductance component can be canceled. Bounce can be suppressed.

  In addition, the conductor conductors 141b and the conductor flat plates 141b and the conductor flat plates 141b and the conductor flat plates 141b and the conductor flat plates 141b and the flat conductors 141 and 341 are bent inward and the conductors 141 to 341 are arranged side by side. The portion 241b, the conductor flat plate portion 341b and the conductor flat plate portion 241b, the conductor flat plate portion 141d and the conductor flat plate portion 341d can face each other, and the electrode surfaces of the switching elements Q1 and Q2 and the smoothing capacitor C and the wiring conductor 141 are provided. The space | interval for making it correspond with the plane of -341 can be ensured. For this reason, the wiring inductance can be reduced, and the switching elements Q1 and Q2 and the smoothing capacitor C can be reliably and easily connected without performing complicated processing on the wiring conductors 141 to 341. As a result, it is possible to suppress an increase in component costs and an increase in the manufacturing period, and a special manufacturing apparatus can be dispensed with.

In the above-described embodiment, the connection method for one phase of the power conversion device in FIG. 10 has been described. However, the method may be applied to the connection method for three phases of the power conversion device in FIG. It may be applied to a number of power conversion devices.
FIG. 5 is a plan view showing a schematic configuration of a connecting portion of an electrical component in the power conversion device according to the second embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line AA ′ of FIG. 7 is an exploded perspective view showing the schematic configuration of the connecting portion of the electrical component in FIG. 5, and FIG. 8 is a perspective view showing the schematic configuration of the wiring conductor 361 in FIG.

  5 to 8, the power converter is provided with switching elements Q1 and Q2. Here, the switching elements Q1 and Q2 are respectively provided with a collector terminal C as a high potential side terminal and an emitter terminal E as a low potential side terminal. Switching elements Q1 and Q2 are arranged such that emitter terminal E of switching element Q1 is adjacent to collector terminal C of switching element Q2, and collector terminal C of switching element Q1 is adjacent to emitter terminal E of switching element Q2. Are arranged to be.

  Further, the power converter includes a wiring conductor 161 connected to the collector terminal C of the switching element Q1, a wiring conductor 241 connecting the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2, and an emitter of the switching element Q2. An insulating material 461 that insulates the wiring conductor 361 connected to the terminal E and the wiring conductors 161, 241, and 361 from each other is provided.

Here, a DC power source positive terminal P is formed on the wiring conductor 161, an AC terminal AC is formed on the wiring conductor 241, and a DC power source negative terminal N is formed on the wiring conductor 361.
And the wiring conductor 161 can be comprised from the flat conductor folded inward in the part of the collector terminal C of the switching element Q1. Further, the wiring conductor 241 can be formed of a flat conductor that is folded inward at the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2. Further, the wiring conductor 361 can be formed of a flat conductor that is folded inward at the emitter terminal E of the switching element Q2.

That is, the wiring conductor 161 is a flat conductor bent in a direction opposite to the emitter terminal E of the switching element Q1 so that the portion connected to the collector terminal C of the switching element Q1 is parallel to the DC power source positive terminal P. It can consist of
The wiring conductor 241 is bent in a direction opposite to the collector terminal C of the switching element Q1 so that the portion connected to the emitter terminal E of the switching element Q1 is parallel to the AC terminal AC, and the collector terminal of the switching element Q2 It can be composed of a flat conductor bent in a direction opposite to the emitter terminal E of the switching element Q2 so that the portion connected to C is parallel to the AC terminal AC.

The wiring conductor 361 is composed of a flat conductor bent in a direction opposite to the collector terminal C of the switching element Q2 so that a portion connected to the emitter terminal E of the switching element Q2 is parallel to the DC power source negative terminal N. can do.
The wiring conductors 161 to 361 can be formed with bent portions that are arranged to face each other when the switching elements Q1 and Q2 are connected by the wiring conductors 161 to 361, respectively.

  Specifically, the wiring conductor 161 is provided with conductor flat plate portions 161a to 161d, and a DC power source positive terminal P is formed on the conductor flat plate portion 161a. Here, the length of the conductor flat plate portion 161a can be set so as to correspond to the distance from the component end face of the switching element Q1 to the collector terminal C. Further, the width of the conductor flat plate portion 161a can be set so as to correspond to the width of the switching element Q1.

The conductor flat plate portion 161a is connected to the end on the switching element Q1 side in the length direction so that the conductor flat plate portion 161b is perpendicular to the conductor flat plate portion 161a. The conductor flat plate portion 161c is connected to face the conductive flat plate portion 161a, and a portion connected to the collector terminal C of the switching element Q1 is formed.
In addition, the conductor flat plate portion 161d is connected to the end portion on the switching element Q2 side in the width direction of the conductor flat plate portion 161a so as to be perpendicular to the conductor flat plate portions 161a and 161b.

  Further, the wiring conductor 241 is provided with conductor flat plate portions 241a to 241c, and an AC terminal AC is formed on the conductor flat plate portion 241a. Here, the length of the conductor flat plate portion 241a can be set to correspond to the distance from the component end surface of the switching element Q1 to the emitter terminal E and the distance from the component end surface of the switching element Q2 to the collector terminal C. . The width of the conductor flat plate portion 241a can be set to correspond to the distance between the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2.

  The conductor flat plate portion 241b is connected to the end of the conductor flat plate portion 241a on the switching element Q1, Q2 side in the length direction so that the conductor flat plate portion 241b is perpendicular to the conductor flat plate portion 241a. Are formed so that the conductor flat plate portion 241c is connected to face the conductor flat plate portion 241a, and a portion connected to the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 is formed.

  The wiring conductor 361 is provided with conductor flat plate portions 361a to 361d, and a DC power source negative terminal N is formed on the conductor flat plate portion 361a. Here, the length of the conductor flat plate portion 361a can be set so as to correspond to the distance from the component end face of the switching element Q2 to the emitter terminal E. Further, the width of the conductor flat plate portion 361a can be set to correspond to the width of the switching element Q2.

The conductor flat plate portion 361a is connected to the end on the switching element Q2 side in the length direction so that the conductor flat plate portion 361b is perpendicular to the conductor flat plate portion 361a. The conductor flat plate portion 361c is connected to face the conductive flat plate portion 361a, and a portion connected to the emitter terminal E of the switching element Q2 is formed.
In addition, the conductor flat plate portion 361d is connected to the end portion on the switching element Q1 side in the width direction of the conductor flat plate portion 361a so as to be perpendicular to the conductor flat plate portions 361a and 361b.

The insulating material 461 is provided with insulating flat plate portions 461a to 461c. The insulating flat plate portion 461a is configured to be inserted into a gap between the conductive flat plate portions 161b and 241b, and the insulating flat plate portion 461b is a conductive flat plate portion. The insulating flat plate portion 461c is configured to be inserted into the gap between the conductor flat plate portions 241b and 361b.
In order to secure a creepage distance necessary for insulation between the wiring conductor 161 and the wiring conductor 361, the width of the insulating material 461 may be wider than the width of the conductive flat plate portion 161b to the conductive flat plate portion 361b.

  And the wiring conductor 161 can be arrange | positioned on the switching element Q1 so that the conductor flat plate part 161c may contact the collector terminal C of the switching element Q1. Then, by fixing the wiring conductor 161 to the switching element Q1 with the fixing member 501, the conductor flat plate portion 161b faces the conductor flat plate portion 241b, and the conductor flat plate portion 161d faces the conductor flat plate portion 361d. The wiring conductor 161 can be connected to the collector terminal C of the switching element Q1.

  Further, the wiring conductor 241 can be disposed on the switching elements Q1, Q2 such that the conductor flat plate portion 241c contacts the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2. Then, by fixing the wiring conductor 241 to the switching elements Q1, Q2 with the fixing members 501b, 501c, the conductor flat plate portion 241b faces the conductor flat plate portions 161b, 361b, and the emitter terminal E of the switching element Q1. The collector terminal C of the switching element Q2 can be connected.

  Further, the wiring conductor 361 can be disposed on the switching element Q2 and the smoothing capacitor C such that the conductor flat plate portion 361c is in contact with the emitter terminal E of the switching element Q2. Then, by fixing the wiring conductor 361 to the switching element Q2 with the fixing member 501d, the conductor flat plate portion 361b faces the conductor flat plate portion 241b, and the conductor flat plate portion 361d faces the conductor flat plate portion 161d. The emitter terminal E of the switching element Q2 can be connected to the wiring conductor 361.

10, DC positive electrode terminal P → conductor flat plate portion 161a → conductor flat plate portion 161d → conductor flat plate portion 161b → conductor flat plate portion 161c → collector terminal C of switching element Q1 → emitter terminal E of switching element Q1. The current can flow in the order of the conductive flat plate portion 241c, the conductive flat plate portion 241b, the conductive flat plate portion 241a, and the AC terminal AC.
On the other hand, in the path K2 in FIG. 10, the DC negative electrode terminal N → the conductive flat plate portion 361a → the conductive flat plate portion 361d → the conductive flat plate portion 361b → the conductive flat plate portion 361c → the emitter terminal E of the switching element Q2 → the collector terminal C of the switching element Q2. A current can flow in the order of the conductive flat plate portion 241c → the conductive flat plate portion 241b → the conductive flat plate portion 241a → the AC terminal AC.

Then, it is assumed that the switching element Q1 is turned on and a current flows through the load via the path K1 in FIG. When the switching element Q1 is turned off from this state, the current flowing through the path K1 decreases and the current flowing through the path K2 increases. For this reason, when the switching element Q1 is turned off, the direction of the current change can be made different between the wiring conductors 161, 241, and 361, and the directions of the magnetic fluxes can be made different from each other.
For this reason, the magnetic flux generated when the switching element Q1 is turned off can be canceled out between the wiring conductors 161, 241, and 361, and the inductance component can be canceled. Voltage jump can be suppressed.

In addition, the portions of the wiring conductors 161 to 361 that are connected to the terminals of the switching elements Q1 and Q2 are bent inward, and the wiring conductors 161 to 361 are arranged side by side so that the conductor flat plate portion 161b, the conductor flat plate portion 241b, and the conductor The flat plate portion 361b and the conductive flat plate portion 241b, and the conductive flat plate portion 161d and the conductive flat plate portion 361d can face each other, and the electrode surfaces of the switching elements Q1 and Q2 and the flat surfaces of the wiring conductors 161 to 361 are made to coincide. Can be secured. For this reason, it is possible to reliably and easily connect the switching elements Q1 and Q2 without performing complicated processing on the wiring conductors 161, 241, and 361, while enabling the wiring inductance to be reduced. It is possible to suppress an increase in component costs and a prolonged production period, and a special manufacturing apparatus can be eliminated.
In the above-described embodiment, the connection method for one phase of the power conversion device in FIG. 10 has been described. However, the method may be applied to the connection method for three phases of the power conversion device in FIG. It may be applied to a number of power conversion devices.

  For example, when applied to the power conversion device of FIG. 9, only one power conversion device of FIGS. 1 to 4 is prepared, and only two power conversion devices of FIGS. 5 to 8 are prepared. 1 to 4 and the DC power source negative terminal N of the two power converters of FIGS. 5 to 8 are on the positive side of the power source Ed. 1 to FIG. 4, the DC power source positive terminal P of the power converter and the DC power source positive terminal P of the two power converters of FIGS. 5 to 8 are connected to the negative side of the power source Ed. 1 to 4 are used as the U-phase AC terminal AC (U), and the AC terminals of the single power converters shown in FIGS. 5 to 8 are used. AC can be used as the V-phase AC terminal AC (V), and the AC terminal AC of the remaining one power converter in FIGS. 5 to 8 can be used as the V-phase AC terminal AC (W).

It is a top view which shows schematic structure of the connection part of the electrical component in the power converter device which concerns on 1st Embodiment of this invention. It is sectional drawing cut | disconnected along the AA 'line of FIG. It is a perspective view which decomposes | disassembles and shows schematic structure of the connection part of the electrical component of FIG. FIG. 3 is a perspective view showing a schematic configuration of a wiring conductor 341 in FIG. It is a top view which shows schematic structure of the connection part of the electrical component in the power converter device which concerns on 2nd Embodiment of this invention. It is sectional drawing cut | disconnected along the AA 'line of FIG. It is a perspective view which decomposes | disassembles and shows schematic structure of the connection part of the electrical component of FIG. It is a perspective view which extracts and shows schematic structure of the wiring conductor 361 of FIG. It is a figure which shows the circuit structure for 3 phases of the power converter device by which IGBT was applied to the switching element. It is a figure which shows the circuit structure for 1 phase of the power converter device by which IGBT was applied to the switching element. It is a figure which shows the circuit structure of IGBT of FIG. 12A is a plan view showing a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device, and FIG. 12B is a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device. FIG. It is a perspective view which decomposes | disassembles and shows schematic structure of the laminated wiring conductor of FIG. It is a figure which shows the circuit structure of the power converter device of FIG.

Explanation of symbols

Q1, Q2 Switching element C Smoothing capacitor 141, 241, 341, 161, 361 Wiring conductor 441, 461 Insulating material 141a-141e, 241a-241e, 341a-341e, 161a-161c, 361a-361c Conductive plate 441a-441c, 461a-461c Insulating flat plate portion 501a-501d, 521a, 521b Fixing material

Claims (6)

A first switching element provided with a first low potential side terminal and a first high potential side terminal; a second low potential side terminal; and a second high potential side terminal. The second high potential side terminal is disposed adjacent to the first low potential side terminal, and the second low potential side terminal is disposed adjacent to the first high potential side terminal. Switching elements of
A direct current positive terminal and a direct current negative terminal are provided, the direct current positive terminal is disposed adjacent to the first high potential side terminal, and the direct current negative terminal is disposed adjacent to the second low potential side terminal. Smoothing capacitor,
A first wiring conductor formed with a first external connection electrode terminal and connecting the first low potential side terminal and the second high potential side terminal;
A second wiring conductor formed with a second external connection electrode terminal and connecting the first high potential side terminal and the DC positive electrode terminal;
A third external connection electrode terminal is formed, and includes a second wiring conductor connecting the second low potential side terminal and the DC negative electrode terminal;
At least the second and third wiring conductors are formed with bent portions arranged to face each other ,
The first wiring conductor is composed of a flat plate conductor configured such that a portion connected to the terminal of the switching element is folded inside,
The second and third wiring conductors are constituted by flat conductors configured such that portions connected to the switching element and the terminals of the smoothing capacitor are folded inward, respectively. apparatus. The first wiring conductor is in a direction opposite to the first high potential side terminal so that a portion connected to the first low potential side terminal is parallel to the first external connection electrode terminal. And a portion connected to the second high potential side terminal is bent in a direction opposite to the second low potential side terminal so as to be parallel to the first external connection electrode terminal. A first flat conductor,
The second wiring conductor has a direction opposite to the first low potential side terminal so that a portion connected to the first high potential side terminal is parallel to the second external connection electrode terminal. And a portion connected to the DC positive electrode terminal is formed of a second flat plate conductor bent in a direction opposite to the DC negative electrode terminal so as to be parallel to the second external connection electrode terminal. And
The third wiring conductor has a direction opposite to the second high potential side terminal so that a portion connected to the second low potential side terminal is parallel to the third external connection electrode terminal. And a portion connected to the DC negative electrode terminal is composed of a third flat conductor bent in a direction opposite to the DC positive electrode terminal so as to be parallel to the third external connection electrode terminal The power converter according to claim 1 , wherein the power converter is provided. A first switching element provided with a first low potential side terminal and a first high potential side terminal; a second low potential side terminal; and a second high potential side terminal. The second high potential side terminal is disposed adjacent to the first low potential side terminal, and the second low potential side terminal is disposed adjacent to the first high potential side terminal. Switching elements of
A first wiring conductor formed with a first external connection electrode terminal and connecting the first low potential side terminal and the second high potential side terminal;
A second wiring conductor formed with a second external connection electrode terminal and connected to the first high potential side terminal;
A third external connection electrode terminal is formed, and includes a third wiring conductor connected to the second low potential side terminal,
At least the second and third wiring conductors are formed with bent portions arranged to face each other ,
The first to third wiring conductors are constituted by flat conductors configured such that portions respectively connected to the terminals of the switching element are folded inward . The first wiring conductor is in a direction opposite to the first high potential side terminal so that a portion connected to the first low potential side terminal is parallel to the first external connection electrode terminal. And a portion connected to the second high potential side terminal is bent in a direction opposite to the second low potential side terminal so as to be parallel to the first external connection electrode terminal. A first flat conductor,
The second wiring conductor has a direction opposite to the first low potential side terminal so that a portion connected to the first high potential side terminal is parallel to the second external connection electrode terminal. Composed of a second flat conductor bent to
The third wiring conductor has a direction opposite to the second high potential side terminal so that a portion connected to the second low potential side terminal is parallel to the third external connection electrode terminal. The power conversion device according to claim 3 , wherein the power conversion device is configured by a third flat plate conductor bent in a straight line. A first switching element provided with a first low potential side terminal and a first high potential side terminal, and a second switching element provided with a second low potential side terminal and a second high potential side terminal The switching element is disposed such that the second high potential side terminal is adjacent to the first low potential side terminal and the second low potential side terminal is adjacent to the first high potential side terminal. And a process of
A smoothing capacitor provided with a direct current positive electrode terminal and a direct current negative electrode terminal, wherein the direct current positive electrode terminal is adjacent to the first high potential side terminal and the direct current negative electrode terminal is adjacent to the second low potential side terminal. The step of arranging
Connecting the first low potential side terminal and the second high potential side terminal with a first wiring conductor in which a first external connection electrode terminal is formed;
Connecting the first high potential side terminal and the direct current positive electrode terminal with a second wiring conductor in which a second external connection electrode terminal is formed;
A third wiring conductor having a third external connection electrode terminal formed thereon is arranged in parallel with the second wiring conductor, and the second low potential side terminal and the DC negative electrode terminal are connected to the third wiring. Connecting with a conductor,
At least the second and third wiring conductors are formed with bent portions arranged to face each other ,
The first wiring conductor is composed of a flat plate conductor configured such that a portion connected to the terminal of the switching element is folded inside,
The second and third wiring conductors are constituted by flat conductors configured such that portions connected to the switching element and the terminals of the smoothing capacitor are folded inward, respectively. Connection method. A first switching element provided with a first low potential side terminal and a first high potential side terminal, and a second switching element provided with a second low potential side terminal and a second high potential side terminal The switching element is disposed such that the second high potential side terminal is adjacent to the first low potential side terminal and the second low potential side terminal is adjacent to the first high potential side terminal. And a process of
Connecting the first low potential side terminal and the second high potential side terminal with a first wiring conductor having a first external connection electrode terminal formed thereon;
Connecting the second wiring conductor formed with the second external connection electrode terminal to the first high potential side terminal;
Connecting the third wiring conductor to the second low potential side terminal while arranging the third wiring conductor formed with the third external connection electrode terminal in parallel with the second wiring conductor; With
At least the second and third wiring conductors are formed with bent portions arranged to face each other ,
The method for connecting electrical parts, wherein the first to third wiring conductors are constituted by flat conductors configured such that portions connected to the terminals of the switching element are folded back inward .

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