JP2008306867A - Power conversion equipment and method of connecting electrical part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a wiring inductance of connection of electrical parts, without adding a complicated processing to the manufacture of line parts. <P>SOLUTION: This power conversion equipment is provided with: a wiring conductor 101 which connects the collector terminal C of a switching element Q1 with a DC positive electrode terminal C-P of a smoothing capacitor C; a wiring conductor 201 which connects the emitter terminal E of the switching element Q1 with the collector terminal C of a switching element Q2; and a wiring conductor 301 which connects the emitter terminal E of the switching element Q2 with the DC negative electrode terminal C-N of the smoothing capacitor C. The wiring conductor 301 is arranged to stretch over wiring conductors 101 and 201. <P>COPYRIGHT: (C)2009,JPO&INPIT

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. 7 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. 7, feedback diodes D1 to D6 are connected in antiparallel to switching elements Q1 to Q6, switching elements Q1 and Q2 are connected in series to each other, switching elements Q3 and Q4 are connected in series to each other, 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. 8 is a diagram illustrating a circuit configuration of one phase of a power conversion device in which an IGBT is applied to the switching element, and FIG. 9 is a diagram illustrating a circuit configuration of the IGBT of FIG.
In FIG. 8, 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. 9, 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 inputs 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 voltage jump 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.

FIG. 10A is a plan view illustrating a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device, and FIG. 10B illustrates a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device. FIG. 11 is an exploded perspective view showing the schematic configuration of the multilayer wiring conductor of FIG. 10, and FIG. 12 is a diagram showing the circuit configuration of the power conversion device of FIG.
10 to 12, the power converter is provided with switching elements Q1a to Q1c and Q2a to Q2c and capacitors C1 and C2 to which feedback diodes D1a to D1c and D2a to 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. Thus, the emitter terminals E 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 collector terminals C of the switching elements Q1a to Q1c 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. 12, 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. 10, 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 them. In order to perform connection of switching elements Q1a to Q1c, Q2a to Q2c and capacitors C1 and C2 reliably and easily, electrode surfaces and conductors of switching elements Q1a to Q1c and Q2a to Q2c and capacitors C1 and C2 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 formed integrally with 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.
Accordingly, an object of the present invention is to provide a power conversion device and an electrical component connection method capable of reducing the wiring inductance of the connection portion of the electrical component without performing complicated processing in the production of the wiring component. is there.

  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 second switching element provided with a low potential side terminal and a second high potential side terminal, and the second high potential side terminal disposed adjacent to the first low potential side terminal; A smoothing capacitor provided with a direct current positive electrode terminal and a direct current negative electrode terminal, the direct current positive electrode terminal being disposed adjacent to the first high potential side terminal, and a first external connection electrode terminal are formed, A first wiring conductor for connecting the first low potential side terminal and the second high potential side terminal, and a second external connection electrode terminal are formed, and the first high potential side terminal and the direct current are formed. A second wiring conductor connecting the positive terminal and a third external connection electrode terminal are formed. And a third wiring conductor connecting the second low potential side terminal and the DC negative electrode terminal so as to straddle the first wiring conductor and the second wiring conductor. And

  According to the power converter of claim 2, 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 And a second switching element disposed so that the second high potential side terminal is adjacent to the first low potential side terminal, and a first external connection electrode A first wiring conductor connecting the first low potential side terminal and the second high potential side terminal, and a second external connection electrode terminal are formed, and the first high potential side terminal is formed. A second wiring conductor connected to the potential side terminal and a third external connection electrode terminal are formed and connected to the second low potential side terminal, and the first wiring conductor and the second wiring terminal are connected. A third wiring conductor disposed on the first wiring conductor and the second wiring conductor so as to face the wiring conductor of Characterized in that it comprises a line conductor.

  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, a second switching element arranged such that the second low potential side terminal is adjacent to the first high potential side terminal, a DC positive terminal and a DC negative terminal And a smoothing capacitor disposed so that the DC negative electrode terminal is adjacent to the first low-potential side terminal, and a first external connection electrode terminal are formed, and the first high-potential side terminal A first wiring conductor connecting the second low potential side terminal and a second external connection electrode terminal, and connecting the first low potential side terminal and the DC negative terminal. 2 wiring conductors and a third external connection electrode terminal are formed, the first wiring conductor As across over the second wiring conductor, characterized in that it comprises a third wiring conductor connecting said second high-potential-side terminal and the DC positive terminal.

  According to the power converter of claim 4, 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 And a second switching element arranged so that the second low potential side terminal is adjacent to the first high potential side terminal, and a first external connection electrode A first wiring conductor connecting the first high potential side terminal and the second low potential side terminal and a second external connection electrode terminal are formed, and the first low potential side terminal is formed. A second wiring conductor connected to the potential side terminal and a third external connection electrode terminal are formed to be the second high potential side terminal, and the first wiring conductor and the second wiring terminal Third wiring arranged on the first wiring conductor and the second wiring conductor so as to face the wiring conductor Characterized in that it comprises a body.

  Further, according to the power conversion device of claim 5, the first and second wiring conductors are flat plates configured such that a portion connected to the switching element or the terminal of the smoothing capacitor is folded inward. The third wiring conductor is composed of a conductor, and the third wiring conductor is composed of a flat conductor configured such that a portion connected to the switching element or the terminal of the smoothing capacitor is bent outward.

  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 step of arranging the second high potential side terminal adjacent to the first low potential side terminal, and a direct current positive electrode A step of arranging a smoothing capacitor provided with a terminal and a DC negative terminal so that the DC positive terminal is adjacent to the first high-potential terminal; and the first low-potential terminal and the second A step of connecting the high potential side terminal to the first wiring conductor on which the first external connection electrode terminal is formed, and a second external connection of the first high potential side terminal and the DC positive electrode terminal. A step of connecting with a second wiring conductor on which an electrode terminal is formed, and the first wiring conductor A step of connecting the second low potential side terminal and the DC negative electrode terminal with a third wiring conductor on which a third external connection electrode terminal is formed so as to straddle the second wiring conductor. It is characterized by providing.

  According to the electrical component connection method of claim 7, 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 so that the second high potential side terminal is adjacent to the first low potential side terminal; A step of connecting the first low potential side terminal and the second high potential side terminal with the first wiring conductor on which the first external connection electrode terminal is formed, and the second external connection electrode terminal comprising: A step of connecting the formed second wiring conductor to the first high potential side terminal; and the first wiring conductor and the second wiring conductor so as to face the first wiring conductor and the second wiring conductor. By disposing on the second wiring conductor, the third wiring conductor on which the third external connection electrode terminal is formed is placed in front. Characterized in that it comprises a step of connecting to a second low-potential-side terminal.

  According to the electrical component connecting method of claim 8, 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, a step of arranging the second low potential side terminal adjacent to the first high potential side terminal, and a direct current positive electrode A step of disposing a smoothing capacitor provided with a terminal and a direct current electrode terminal so that the direct current negative electrode terminal is adjacent to the first low potential side terminal; the first high potential side terminal; A step of connecting the low potential side terminal to the first wiring conductor on which the first external connection electrode terminal is formed, and a second external connection of the first low potential side terminal and the DC negative electrode terminal. Connecting with a second wiring conductor on which an electrode terminal is formed, and the first wiring conductor; The step of connecting the second high potential side terminal and the DC positive electrode terminal with the third wiring conductor on which the third external connection electrode terminal is formed so as to straddle the second wiring conductor. It is characterized by providing.

  According to the electrical component connection method of claim 9, 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, such that the second low potential side terminal is adjacent to the first high potential side terminal; Connecting a first high potential side terminal and the second low potential side terminal with a first wiring conductor having a first external connection electrode terminal formed thereon; and a second external connection electrode terminal comprising: A step of connecting the formed second wiring conductor to the first low potential side terminal; and the first wiring conductor and the second wiring conductor so as to face the first wiring conductor and the second wiring conductor. By disposing on the second wiring conductor, the third wiring conductor on which the third external connection electrode terminal is formed is placed in front. Characterized in that it comprises a step of connecting the second high-potential-side terminal.

  As described above, according to the present invention, it is possible to arrange the wiring conductors facing each other by disposing the third wiring conductor so as to straddle the first and second wiring conductors. At the same time, by bending the wiring conductor, it is possible to secure an interval for making the electrode surfaces of the switching element and the smoothing capacitor coincide with the plane of the wiring conductor. 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 connection part of an electrical component in the power conversion device according to the first embodiment of the present invention, and FIG. FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG.
1 to 3, the power converter is provided with switching elements Q1 and Q2 and a smoothing capacitor C. 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 each 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.
The switching elements Q1, Q2 and the smoothing capacitor C are arranged so that the emitter terminal E of the switching element Q1 is adjacent to the collector terminal C of the switching element Q2, and the collector terminal C of the switching element Q1 is the DC positive electrode of the smoothing capacitor C. Arranged adjacent to the terminal CP.

  In addition, the power converter is connected to the wiring conductor 101 that connects 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 201 to be connected, the wiring conductor 301 for 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 401 for insulating the wiring conductors 101, 201, 301 from each other are provided.

  Here, the wiring conductor 101 can be composed of a flat conductor configured to be folded inward at the collector terminal C of the switching element Q1 and the DC positive terminal CP of the smoothing capacitor C. Moreover, the wiring conductor 201 can be comprised from the flat conductor comprised so that it might be turned inside by the part of the emitter terminal E of the switching element Q1, and the collector terminal C of the switching element Q2. Moreover, the wiring conductor 301 can be comprised from the flat conductor comprised so that it might be turned outward at the part of the emitter terminal E of the switching element Q2, and the direct current | flow negative electrode terminal CN of the smoothing capacitor C.

  In other words, the wiring conductor 101 is provided with conductor flat plate portions 101a to 101e, and a DC power source positive terminal P is formed on the conductor flat plate portion 101a. Here, the length of the conductor flat plate portion 101a 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. The conductive flat plate portions 101a are connected to both ends in the length direction so that the conductive flat plate portions 101c and 101d are perpendicular to the conductive flat plate portion 101a, and the conductive flat plate portions 101c and 101d are connected to the end portions of the conductive flat plate portions 101c and 101d. The portions 101b and 101e are connected to face the conductor flat plate portion 101a.

  The wiring conductor 201 is provided with conductor flat plate portions 201a to 201e, and an AC terminal AC is formed on the conductor flat plate portion 201a. Here, the length of the conductor flat plate portion 201a can be set so as 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 both ends of the conductor flat plate portion 201a are connected so that the conductor flat plate portions 201c and 201d are perpendicular to the conductor flat plate portion 201a. The conductor flat plate portions 201c and 201d are connected to the end portions of the conductor flat plate portions 201c and 201d. The parts 201b and 201e are connected so as to face the conductor flat plate part 101a.

  The wiring conductor 301 is provided with conductor flat plate portions 301a to 301e, and a DC power source negative terminal N is formed on the conductor flat plate portion 301a. Here, the length of the conductor flat plate portion 301a is equal 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 when the lengths of the conductor flat plate portions 301b and 301e are added up. Can be set to correspond. The conductor flat plate portions 301a are connected to both ends in the length direction so that the conductor flat plate portions 301c and 301d are perpendicular to the conductor flat plate portion 301a. The parts 301b and 301e are connected to face the outside of the conductor flat plate part 301a.

  The insulating material 401 is provided with insulating flat plate portions 401a to 401d. The insulating flat plate portion 401a is configured to be inserted into a gap between the conductive flat plate portion 301a and the conductive flat plates 101a and 201a. The portion 401b is configured to be inserted into the gap between the conductive flat plate portions 101c and 301c, and the insulating flat plate portion 401c is configured to be inserted into the gap between the conductive flat plate portions 101d and 201c, and the insulating flat plate portion 401d. Is configured to be inserted into the gap between the conductor flat plate portions 201d and 301d.

Note that the width of the insulating material 401 may be wider than the width of the wiring conductor 301 in order to ensure a creepage distance necessary for insulation between the wiring conductors 101 to 301.
Then, the conductor flat plate portion 101e is in contact with the collector terminal C of the switching element Q1, and the conductor flat plate portion 101b 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. The conductor 101 is disposed, and the wiring conductor 101 is fixed to the switching element Q1 and the smoothing capacitor C by the fixing members 501c and 501d, thereby connecting the collector terminal C of the switching element Q1 and the DC positive terminal CP of the smoothing capacitor C. can do.

  Further, the wiring conductor 201 is arranged on the switching elements Q1 and Q2 such that the conductor flat plate portion 201e is in contact with the collector terminal C of the switching element Q2 and the conductor flat plate portion 201b is in contact with the emitter terminal E of the switching element Q1. By fixing the wiring conductor 201 to the switching elements Q1 and Q2 with the fixing members 501a and 501b, the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 can be connected.

  Further, the insulating material 401 is disposed on the wiring conductors 101 and 201 so that the insulating flat plate portion 401c is inserted into the gap between the conductive flat plate portions 101d and 201c. The conductor flat plate portion 301e is in contact with the emitter terminal E of the switching element Q2, and the conductor flat plate portion 301b is in contact with the DC negative electrode terminal CN of the smoothing capacitor C so as to straddle the wiring conductors 101 and 201. The wiring conductor 301 is disposed, and the wiring conductor 301 is fixed to the switching element Q2 and the smoothing capacitor C by the fixing members 521a and 521b, so that the emitter terminal E of the switching element Q2 and the DC negative electrode terminal CN of the smoothing capacitor C are connected. Can be connected.

For example, screws and bolts can be used as the fixing members 501a to 501d, 521a, and 521b.
Here, in the path K1 of FIG. 8, the DC positive electrode terminal CP of the smoothing capacitor C → the conductive flat plate portion 101b → the conductive flat plate portion 101c → the conductive flat plate portion 101a → the conductive flat plate portion 101d → the conductive flat plate portion 101e → the switching element Q1. Current can flow in the order of collector terminal C → switching element Q1 → emitter terminal E of switching element Q1 → conductor flat plate portion 201b → conductor flat plate portion 201c → conductor flat plate portion 201a → AC terminal AC.

  On the other hand, in the path K2 of FIG. 8, the DC negative electrode terminal CN of the smoothing capacitor C → the conductive flat plate portion 301b → the conductive flat plate portion 301c → the conductive flat plate portion 301a → the conductive flat plate portion 301d → the conductive flat plate portion 301e → the emitter of the switching element Q2. A current can flow in the order of terminal E → switching element Q2 → collector terminal C of switching element Q2 → conductor flat plate portion 201e → conductor flat plate portion 201d → conductor flat plate portion 201a → AC terminal AC.

Then, it is assumed that the switching element Q1 is turned on and a current flows to 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 101 to 301, and the direction of the magnetic flux can be made different.
For this reason, the magnetic flux generated when the switching element Q1 is turned off can be canceled between the wiring conductors 101 to 301, and the inductance component can be canceled out. Bounce can be suppressed.

  Further, by arranging the wiring conductors 301 and 201 so as to straddle the wiring conductors 301, it becomes possible to arrange the wiring conductors 101 to 301 facing each other, and by bending the wiring conductors 101 to 301, An interval for making the electrode surfaces of the switching elements Q1 and Q2 and the smoothing capacitor C coincide with the planes of the wiring conductors 101 to 301 can be secured. Therefore, 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 101 to 301. 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 emitter terminal E of the switching element Q1 is adjacent to the collector terminal C of the switching element Q2, and the collector terminal C of the switching element Q1 is adjacent to the DC positive terminal CP of the smoothing capacitor C. Switching elements Q1, Q2 and a smoothing capacitor C are arranged, the collector terminal C of the switching element Q1 and the DC positive terminal CP of the smoothing capacitor C are connected by the wiring conductor 101, and the emitter terminal E of the switching element Q1 and the switching element By connecting the collector terminal C of Q2 with the wiring conductor 201 and arranging the wiring conductor 301 so as to straddle the wiring conductors 101 and 201, the emitter terminal E of the switching element Q2 and the DC negative terminal C− of the smoothing capacitor C The method of connecting N with the wiring conductor 301 has been described. It may be applied to the connection method.

  For example, the switching elements Q1, Q2, and the switching elements Q1, Q2, and the like so that the collector terminal C of the switching element Q1 is adjacent to the emitter terminal E of the switching element Q2, and the emitter terminal E of the switching element Q1 is adjacent to the DC negative terminal CN of the smoothing capacitor C. The smoothing capacitor C is arranged, the emitter terminal E of the switching element Q1 and the DC negative terminal CN of the smoothing capacitor C are connected by the wiring conductor 101, and the collector terminal C of the switching element Q1 and the emitter terminal E of the switching element Q2 are connected. The wiring conductor 201 is connected so that the wiring conductor 301 extends over the wiring conductors 101 and 201, whereby the collector terminal C of the switching element Q <b> 2 and the DC positive terminal CP of the smoothing capacitor C are connected to the wiring conductor 301. May be connected.

In the above-described embodiment, the connection method for one phase of the power conversion device in FIG. 8 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 apparatus of FIG. 7, three wiring conductors 201 are prepared, and the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 are connected by the first wiring conductor 201. The emitter terminal E of the switching element Q3 and the collector terminal C of the switching element Q4 are connected by the second wiring conductor 201, and the emitter terminal E of the switching element Q5 and the switching element Q6 are connected by the third wiring conductor 201. A collector terminal C can be connected. The collector terminal C of the switching elements Q1, Q3, and Q5 and the DC positive terminal CP of the smoothing capacitor C are connected in common by the wiring conductor 101, and the emitter terminals of the switching elements Q2, Q4, and Q6 are connected by the wiring conductor 301. E and the DC negative terminal C-N of the smoothing capacitor C can be connected in common.

FIG. 4 is a plan view showing a schematic configuration of a connection part of an electrical component in a power conversion device according to a second embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view taken along the line AA ′ of FIG.
4 to 6, switching elements Q1 and Q2 are provided in the power conversion device. 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 switching elements Q1, Q are arranged such that the emitter terminal E of the switching element Q1 is adjacent to the collector terminal C of the switching element Q2.

  Further, the power converter includes a wiring conductor 121 connected to the collector terminal C of the switching element Q1, a wiring conductor 201 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 421 that insulates the wiring conductor 321 connected to the terminal E and the wiring conductors 121, 201, 321 from each other is provided.

  Here, the wiring conductor 121 can be composed of a flat conductor configured to be folded inward at the collector terminal C of the switching element Q1. Moreover, the wiring conductor 201 can be comprised from the flat conductor comprised so that it might be turned inside by the part of the emitter terminal E of the switching element Q1, and the collector terminal C of the switching element Q2. Moreover, the wiring conductor 321 can be comprised from the flat conductor comprised so that it might bend | folded outside at the part of the emitter terminal E of the switching element Q2.

  In other words, the wiring conductor 121 is provided with conductor flat plate portions 121a, 121d, and 121e, and a DC power source positive terminal P is formed at one end in the length direction of the conductor flat plate portion 121a. The other end in the length direction of the conductive flat plate portion 121a is connected so that the conductive flat plate portion 121d is perpendicular to the conductive flat plate portion 121a, and the conductive flat plate portion 121d is connected to the end of the conductive flat plate portion 121d. It is connected so as to face the conductor flat plate portion 121a.

  The wiring conductor 201 is provided with conductor flat plate portions 201a to 201e, and an AC terminal AC is formed on the conductor flat plate portion 201a. Here, the length of the conductor flat plate portion 201a can be set so as 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 both ends of the conductor flat plate portion 201a are connected so that the conductor flat plate portions 201c and 201d are perpendicular to the conductor flat plate portion 201a. The conductor flat plate portions 201c and 201d are connected to the end portions of the conductor flat plate portions 201c and 201d. The parts 201b and 201e are connected so as to face the conductor flat plate part 101a.

  The wiring conductor 321 is provided with conductor flat plate portions 321a, 321d, and 321e, and a DC power source negative terminal N is formed at one end of the conductor flat plate portion 321a in the length direction. Here, the length of the conductor flat plate portion 321a can be set to be equal to or greater than the sum of the lengths of the conductor flat plate portions 121a and 201a. The other end in the length direction of the conductor flat plate portion 321a is connected so that the conductor flat plate portion 321d is perpendicular to the conductor flat plate portion 321a, and the conductor flat plate portion 321e is provided at the end of the conductor flat plate portion 321d. It connects so that it may face the outer side of the conductor flat plate part 321a.

  The insulating material 421 is provided with insulating flat plate portions 421a, 421c, and 421d. The insulating flat plate portion 421a is configured to be inserted into a gap between the conductive flat plate portion 321a and the conductive flat plates 121a and 201a. The insulating flat plate portion 421c is configured to be inserted into the gap between the conductive flat plate portions 121d and 201c, and the insulating flat plate portion 421d is configured to be inserted into the gap between the conductive flat plate portions 201d and 321d.

Then, the wiring conductor 121 is arranged on the switching element Q1 so that the conductor flat plate portion 121e contacts the collector terminal C of the switching element Q1, and the wiring conductor 121 is fixed to the switching element Q1 by the fixing member 501c. The wiring conductor 121 can be connected to the collector terminal C of the switching element Q1.
Further, the wiring conductor 201 is arranged on the switching elements Q1 and Q2 such that the conductor flat plate portion 201e is in contact with the collector terminal C of the switching element Q2 and the conductor flat plate portion 201b is in contact with the emitter terminal E of the switching element Q1. By fixing the wiring conductor 201 to the switching elements Q1 and Q2 with the fixing members 501a and 501b, the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 can be connected.

  Further, the insulating material 421 is disposed on the wiring conductors 121 and 201 so that the insulating flat plate portion 421c is inserted into the gap between the conductive flat plate portions 121d and 201c. Then, the wiring conductor 321 is disposed on the wiring conductors 121 and 201 so as to oppose the wiring conductors 121 and 201 so that the conductor flat plate portion 321e contacts the emitter terminal E of the switching element Q2, and the fixing member 521a By fixing the wiring conductor 321 to the switching element Q2, the wiring conductor 321 can be connected to the emitter terminal E of the switching element Q2.

Here, in the path K1 of FIG. 8, DC positive electrode terminal P → conductor flat plate portion 121a → conductor flat plate portion 121d → conductor flat plate portion 121e → collector terminal C of switching element Q1 → switching element Q1 → emitter terminal E of switching element Q1 → A current can flow in the order of the conductive flat plate portion 201b → the conductive flat plate portion 201c → the conductive flat plate portion 201a → the AC terminal AC.
On the other hand, in the path K2 of FIG. 8, the DC negative electrode terminal N → the conductive flat plate portion 321a → the conductive flat plate portion 321d → the conductive flat plate portion 321e → the emitter terminal E of the switching element Q2 → the switching element Q2 → the collector terminal C of the switching element Q2. A current can flow in the order of the flat plate portion 201e → the conductive flat plate portion 201d → the conductive flat plate portion 201a → the AC terminal AC.

Then, it is assumed that the switching element Q1 is turned on and a current flows to 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 121, 201, 321 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 121, 201, 321 and the inductance component can be canceled out. Voltage jump can be suppressed.

  In addition, by arranging the wiring conductors 321 on the wiring conductors 121 and 201 so as to face each other, the wiring conductors 121, 201, and 321 can be arranged facing each other, and the wiring conductors 121, 201, and 321 are arranged. Can be secured to allow the electrode surfaces of the switching elements Q1, Q2 and the planes of the wiring conductors 121, 201, 321 to coincide with each other. 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 121, 201, and 321 while allowing 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 embodiment described above, the switching elements Q1 and Q2 are arranged so that the emitter terminal E of the switching element Q1 is adjacent to the collector terminal C of the switching element Q2, and the collector terminal C of the switching element Q1 is connected to the wiring conductor 121. Then, the emitter terminal E of the switching element Q1 and the collector terminal C of the switching element Q2 are connected by the wiring conductor 201, and the wiring conductor 321 is disposed on the wiring conductors 121 and 201 so as to face each other. Although the method for connecting the emitter terminal E to the wiring conductor 321 has been described, it may be applied to other connection methods.

  For example, the switching elements Q1 and Q2 are arranged so that the collector terminal C of the switching element Q1 is adjacent to the emitter terminal E of the switching element Q2, the emitter terminal E of the switching element Q1 is connected to the wiring conductor 121, and the switching element Q1 The collector terminal C and the emitter terminal E of the switching element Q2 are connected by the wiring conductor 201, and the wiring conductor 321 is arranged on the wiring conductors 121 and 201 so as to face each other, whereby the collector terminal C of the switching element Q2 is connected to the wiring conductor. 321 may be connected.

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 a perspective view which decomposes | disassembles and shows schematic structure of the connection part of the electrical component of FIG. It is sectional drawing cut | disconnected along the AA 'line of 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 a perspective view which decomposes | disassembles and shows schematic structure of the connection part of the electrical component of FIG. It is sectional drawing cut | disconnected along the AA 'line 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. FIG. 10A is a plan view illustrating a schematic configuration of the multilayer wiring conductor in the connection portion of the conventional power conversion device, and FIG. 10B illustrates 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 101, 201, 301, 121, 321 Wiring conductor 401, 421 Insulating material 101a-101e, 201a-201e, 301a-301e, 121a, 121d, 121e, 321a, 321d, 321e Conductor flat plate 401a-401d, 421a, 421c, 421d Insulating flat plate portion 501a-501d, 521a, 521d Fixing material

Claims (9)

A first switching element provided with a first low potential side terminal and a first high potential side terminal;
A second switching element provided with a second low potential side terminal and a second high potential side terminal, and arranged so that the second high potential side terminal is adjacent to the first low potential side terminal When,
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 disposed adjacent to the first high potential side terminal;
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 the second low potential side terminal and the DC negative electrode terminal are connected to extend over the first wiring conductor and the second wiring conductor. 3. A power conversion device comprising: 3 wiring conductors. A first switching element provided with a first low potential side terminal and a first high potential side terminal;
A second switching element provided with a second low potential side terminal and a second high potential side terminal, and arranged so that the second high potential side terminal is adjacent to the first low potential side terminal When,
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 connected to the second low potential side terminal, and the first wiring is disposed so as to face the first wiring conductor and the second wiring conductor. A power conversion device comprising: a conductor and a third wiring conductor disposed on the second wiring conductor. A first switching element provided with a first low potential side terminal and a first high potential side terminal;
A second switching element provided with a second low potential side terminal and a second high potential side terminal, and arranged so that the second low potential side terminal is adjacent to the first high potential side terminal When,
A smoothing capacitor provided with a direct current positive electrode terminal and a direct current negative electrode terminal, wherein the direct current negative electrode terminal is disposed adjacent to the first low potential side terminal;
A first wiring conductor that is formed with a first external connection electrode terminal and connects the first high potential side terminal and the second low potential side terminal;
A second wiring conductor formed with a second external connection electrode terminal and connecting the first low potential side terminal and the DC negative electrode terminal;
A third external connection electrode terminal is formed, and the second high potential side terminal and the DC positive electrode terminal are connected so as to straddle the first wiring conductor and the second wiring conductor. 3. A power conversion device comprising: 3 wiring conductors. A first switching element provided with a first low potential side terminal and a first high potential side terminal;
A second switching element provided with a second low potential side terminal and a second high potential side terminal, and arranged so that the second low potential side terminal is adjacent to the first high potential side terminal When,
A first wiring conductor that is formed with a first external connection electrode terminal and connects the first high potential side terminal and the second low potential side terminal;
A second wiring conductor formed with a second external connection electrode terminal and connected to the first low potential side terminal;
A third external connection electrode terminal is formed to serve as the second high potential side terminal, and the first wiring conductor is opposed to the first wiring conductor and the second wiring conductor. And a third wiring conductor disposed on the second wiring conductor. The first and second wiring conductors are composed of flat conductors configured such that a portion connected to the switching element or the terminal of the smoothing capacitor is folded inside,
5. The third wiring conductor according to claim 1, wherein the third wiring conductor is constituted by a flat conductor configured such that a portion connected to the switching element or the terminal of the smoothing capacitor is bent outward. The power converter of any one of Claims. 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 Disposing a switching element such that the second high potential side terminal is adjacent to the first low potential side terminal;
Arranging a smoothing capacitor provided with a direct current positive electrode terminal and a direct current negative electrode terminal so that the direct current positive electrode terminal is adjacent to the first high potential side terminal;
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 on which a second external connection electrode terminal is formed;
A third external connection electrode terminal is formed between the second low potential side terminal and the DC negative electrode terminal so as to straddle over the first wiring conductor and the second wiring conductor. And a step of connecting with a wiring conductor. 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 Disposing a switching element such that the second high potential side terminal is adjacent to the first low potential side terminal;
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 second wiring conductor formed with the second external connection electrode terminal to the first high potential side terminal;
A third external connection electrode terminal is formed by disposing the first wiring conductor and the second wiring conductor on the first wiring conductor and the second wiring conductor so as to face the first wiring conductor and the second wiring conductor. And connecting the third wiring conductor to the second low potential side terminal. 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 Disposing a switching element such that the second low potential side terminal is adjacent to the first high potential side terminal;
Arranging a smoothing capacitor provided with a direct current positive electrode terminal and a direct current electrode terminal so that the direct current negative electrode terminal is adjacent to the first low potential side terminal;
Connecting the first high potential side terminal and the second low potential side terminal with a first wiring conductor in which a first external connection electrode terminal is formed;
Connecting the first low potential side terminal and the DC negative electrode terminal with a second wiring conductor in which a second external connection electrode terminal is formed;
A third external connection electrode terminal is formed between the second high potential side terminal and the DC positive electrode terminal so as to straddle over the first wiring conductor and the second wiring conductor. And a step of connecting with a wiring conductor. 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 Disposing a switching element such that the second low potential side terminal is adjacent to the first high potential side terminal;
Connecting the first high potential side terminal and the second low potential side terminal with a first wiring conductor in which a first external connection electrode terminal is formed;
Connecting the second wiring conductor formed with the second external connection electrode terminal to the first low potential side terminal;
A third external connection electrode terminal is formed by disposing the first wiring conductor and the second wiring conductor on the first wiring conductor and the second wiring conductor so as to face the first wiring conductor and the second wiring conductor. And connecting the third wiring conductor to the second high potential side terminal.

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