JP2016140138A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten length of a connection conductor.SOLUTION: A power converter includes: a plurality of semiconductor switching elements; a pair of switching modules which are at least provided with a plurality of pairs of power terminals connected to pairs of input/output terminals inputting/outputting power in the semiconductor switching elements and in which the respective pairs of power terminals are arranged in parallel in a first direction; a pair of first connection conductors which are connected to a part of the power terminals, inputting to the part DC current supplied from outside or supplying to outside DC current outputted from the part; and a pair of second connection conductors which are connected to the rest of the power terminals, supplying to outside conversion power outputted by the rest or inputting external power supplied from outside. The pair of switching modules are adjacently arranged in a prescribed posture and in a prescribed direction. The pair of first connection conductors are extended in the first direction on the side nearer the part among arrangement directions of the pair of power terminals in the pair of switching modules.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power conversion device.

  The following Patent Document 1 describes, as a conventional technique, an inverse converter (power converter) in which semiconductor switching elements are connected to each other by a wiring conductor, a DC conductor, and an AC conductor (see FIG. 2).

JP 2011-111784 A

  In the above power conversion device, a metal plate (generally referred to as a bus bar) such as a wiring conductor, a DC conductor, and an AC conductor is used as a connection conductor for interconnecting semiconductor switching elements when mounting components. The shorter one is preferable. In the power conversion device, for example, if the bus bar between the semiconductor switching element and the smoothing capacitor becomes long, the floating inductance increases, so that the surge voltage when the semiconductor switching element is turned ON / OFF cannot be sufficiently reduced. Therefore, minimization of connection conductors such as bus bars is a very important technical problem in actually configuring a power converter.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to shorten the length of the connection conductor, particularly the length of the connection conductor between the semiconductor switching element and the smoothing capacitor.

  In order to achieve the above object, in the present invention, as a first solution, a plurality of pairs of power connected to a plurality of semiconductor switching elements and a pair of input / output terminals that input and output power in the semiconductor switching elements, respectively. And a pair of switching modules in which each pair of power terminals is arranged in parallel in the first direction and a part of the power terminals, and DC power supplied from the outside is input to the part or A pair of first connection conductors that supply DC power output from a part to the outside and external power that is connected to the rest of the power terminal and that supplies the converted power output from the rest or is supplied from the outside A power converter including a pair of input second connection conductors, wherein the pair of switching modules are arranged adjacent to each other in a predetermined posture and in a predetermined direction, and the pair of first connections Body, among the array direction of the pair of power terminals of the pair of switching modules, extending in the first direction in the near portion side, employing the means of.

  In the present invention, as the second solution means, in the first solution means, a pair of switching modules are arranged in a posture opposite to each other and adjacent to each other in the first direction.

  In the present invention, as the third solving means, in the first solving means, a pair of switching modules are disposed in the same orientation and adjacent to each other in the arrangement direction of the pair of power terminals.

  In the present invention, as a fourth solving means, a means is provided in which any one of the first to third solving means includes a number corresponding to the number of phases of the electric motor that supplies the converted power.

  In the present invention, as a fifth solution, in the fourth solution, the electric motor is a switched reluctance motor, the plurality of semiconductor switching elements are one or a plurality of transistors and one diode, A means is adopted in which a pair of switching legs that drive the switched reluctance motor are configured by being interconnected by a first connection conductor and a pair of second connection conductors.

  According to the present invention, the pair of switching modules are arranged adjacent to each other in a predetermined posture and in a predetermined arrangement direction, and the pair of first connection conductors is the above-mentioned one of the arrangement directions of the pair of power terminals in the pair of switching modules. Since it extends in the first direction on the side close to the part, the length of the first connection conductor can be shortened.

It is the component arrangement | positioning figure (a) of the power converter device which concerns on 1st Embodiment of this invention, and the circuit diagram (b) of a power module. It is a circuit diagram of the power converter concerning a 1st embodiment of the present invention. It is a component arrangement | positioning figure which shows the reference example with respect to the power converter device which concerns on 1st Embodiment of this invention. It is the component arrangement | positioning figure (a) of the power converter device which concerns on 2nd Embodiment of this invention, and the circuit diagram (b) of a power module. It is component arrangement drawing of the power converter device which concerns on the modification of 2nd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1A, the power conversion apparatus A according to the first embodiment includes a pair of power modules (first power module PM1 and second power module PM2) and two pairs of bus bars (first bus bar). B1, second bus bar B2, third bus bar B3 and fourth bus bar B4) and two insulating plates (first insulating plate I1 and second insulating plate I2) are provided as main components.

  In FIG. 1A, a bus bar (control system bus bar) for supplying a control signal (switching signal) for operating the pair of power modules to the pair of power modules is omitted for convenience.

  The pair of power modules (first power module PM1 and second power module PM2) are switching modules having exactly the same configuration, and have a substantially rectangular outer shape in front view as shown in FIG. ing. The pair of power modules (the first power module PM1 and the second power module PM2) are two pairs connected to the input / output terminals of the two transistors Q1, Q2, one diode D, and two transistors Q1, Q2, respectively. Transistor power terminals T1, T2, T3, and T4, a pair of diode terminals T5 and T6 connected to the input / output terminals of the diode D, and a transistor control commonly connected to the input terminals of the two transistors Q1 and Q2, respectively. A terminal T7 and a pair of auxiliary power terminals T8 and T9 connected to the input / output terminals of one transistor Q1 in a mutually assisting manner are provided. The two transistors Q1, Q2 and one diode D are semiconductor switching elements in the present embodiment.

  As shown in FIG. 1B, the two transistors Q1 and Q2 are IGBTs (Insulated Gate Bipolar Transistors) each having a pair of input / output terminals connected to a protective diode, and accordingly Of the pair of input / output terminals of the two transistors Q1 and Q2, one input / output terminal is a collector, and the other input / output terminal is an emitter. Of the above terminals, two pairs of transistor power terminals T1, T2, T3, T4, a pair of diode terminals T5, T6 and a pair of auxiliary power terminals T8, T9 are connected to the input / output terminals, respectively. Power terminal.

  That is, of the two pairs of transistor power terminals T1, T2, T3, T4, the two transistor power terminals T1, T2 constitute one pair, and the other two transistor power terminals T3, T4 are It constitutes the other pair. The first transistor power terminal T1 in the first pair is connected to the collector of the first transistor Q1, and the second transistor power terminal T2 in the first pair is also connected to the emitter of the first transistor Q1. On the other hand, the third transistor power terminal T3 in the second pair is connected to the collector of the second transistor Q2, and the fourth transistor power terminal T4 in the second pair is connected to the emitter of the second transistor Q2.

  The transistor control terminal T7 is commonly connected to the gates of the two transistors Q1 and Q2, the first auxiliary power terminal T8 is connected to the collector of one transistor Q1, and the second auxiliary power terminal T9 is connected to one of the transistors Q1 and Q2. The transistor Q1 is connected to the emitter. Of the pair of diode terminals T5 and T6, one diode terminal T5 is connected to the cathode which is one input / output terminal of the diode D, and the other diode terminal T6 is the other input / output terminal of the diode D. Is connected to the anode.

  In addition, the first transistor power terminal T1 and the second transistor power terminal T2 constituting the first pair, the third transistor power terminal T3 and the fourth transistor power terminal T4 constituting the second pair, As shown in FIG. 1A, the pair of diode terminals T5 and T6, that is, the three terminal pairs are arranged in the longitudinal direction of the first power module PM1 and the second power module PM2 having a substantially rectangular outer shape when viewed from the front. They are arranged in parallel in the (first direction). In addition, these three terminal pairs are arranged in the lateral direction (second direction) of the first power module PM1 and the second power module PM2 in front view, respectively.

  That is, the three terminal pairs are arranged in two rows in the first direction as a whole, and the two terminals constituting each terminal pair are the first of the pair of power modules (first power module PM1 and second power module PM2). They are arranged so that they are at the same position in one direction, that is, at each intersection of the orthogonal lattice. The pair of power modules (the first power module PM1 and the second power module PM2) are disposed on a predetermined placement surface (plane), and the three terminal pairs are the same with respect to the placement surface. It is arranged at the position (same height).

  As shown in FIG. 1A, the pair of power modules (the first power module PM1 and the second power module PM2) includes a pair of diode terminals T5 and T6 of the first power module PM1 and the second power. A terminal composed of a pair of diode terminals T5 and T6 of the module PM2, and a second transistor power terminal T2, a fourth transistor power terminal T4, and the other diode terminal T6 of the first power module PM1. A row and a row of terminals including the first transistor power terminal T1, the third transistor power terminal T3, and one of the diode terminals T5 of the second power module PM2 are arranged in a row (that is, the first power module PM1 of the first power module PM1). Transistor power terminal T1, third transistor power terminal T3 and one diode A terminal row composed of the power supply terminal T5 and a terminal row composed of the second transistor power terminal T2, the fourth transistor power terminal T4 and the other diode terminal T6 of the second power module PM2). It is arrange | positioned on the above-mentioned mounting surface by positional relationship.

  That is, the pair of power modules (the first power module PM1 and the second power module PM2) are disposed adjacent to each other in the postures opposite to each other in the vertical direction (first direction) on the placement surface. Note that the placement surface described above is, for example, one surface of the heat sink that is a heat radiating component (mounting surfaces of the first power module PM1 and the second power module PM2).

  Meanwhile, two pairs of bus bars (first bus bar B1, second bus bar B2, third bus bar B3, and fourth bus bar B4) connected to such a pair of power modules (first power module PM1 and second power module PM2). ), The first bus bar B1 and the second bus bar B2 are first connection conductors constituting the first pair, and are supplied to the pair of power modules (the first power module PM1 and the second power module PM2) from the outside. It is a bus bar for direct current power input which inputs the direct current power to be performed. The third bus bar B3 and the fourth bus bar B4 are second connection conductors constituting the second pair, and the converted power output from the pair of power modules (first power module PM1 and second power module PM2). Is a converted power output bus bar that supplies power to an external load (electric motor).

  Such two pairs of bus bars (first bus bar B1, second bus bar B2, third bus bar B3 and fourth bus bar B4) are connected by bending a conductive plate (for example, a copper plate) having a desired shape as required. It is a conductor. Of these two pairs of bus bars (first bus bar B1, second bus bar B2, third bus bar B3 and fourth bus bar B4), the first bus bar B1 is the first power module PM1 as shown in FIG. Are connected to the second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6. On the other hand, as shown in FIG. 1A, the second bus bar B2 is connected to the first transistor power terminal T1, the third transistor power terminal T3, and one diode terminal T5 of the second power module PM2. Yes.

  That is, the first bus bar B1 and the second bus bar B2 constituting the first pair are, as shown in FIG. 1A, out of both sides of the first power module PM1 and the second power module PM2 arranged in the vertical direction. , The second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6 of the first power module PM1 (the first transistor power terminal T1, the third transistor power terminal of the second power module PM2). T3 and one of the diode terminals T5), that is, on the side close to the terminal row for inputting DC power, which is a part of the above-described three terminal pairs, and one surface of each has the first insulating plate I1 interposed therebetween. The main parts (the first main part b11 and the second main part b21) that are opposed to each other and that are orthogonal to the placement surface and extend in the vertical direction are provided.

  The first main part b11 and the second main part b21 in the first bus bar B1 and the second bus bar B2 exhibit a parasitic capacitance by facing each other with the first insulating plate I1 interposed therebetween. That is, the first main part b11, the second main part b21, and the first insulating plate I1 constitute a smoothing capacitor C1. Although not shown, the first main part b11, the second main part b21, and the first insulating plate I1 are provided with film capacitors (electronic components) having a predetermined capacitance that complement the first capacitor C1. It has been. The first main part b11 of the first bus bar B1 is connected to the negative electrode of a DC power supply E, which will be described later, and the second main part b21 of the second bus bar B2 is connected to the positive electrode of the DC power supply E.

  Further, of the first bus bar B1 and the second bus bar B2, the first bus bar B1 is continuous with the first main part b11 and parallel to the placement surface as shown in FIG. The second bus bar B2 includes three connection portions b22, b23, and b24 that are continuous with the second main portion b21 and are parallel to the placement surface.

  In the first bus bar B1, the connection portion b12 is connected to the second transistor power terminal T2 of the first power module PM1, the connection portion b13 is connected to the fourth transistor power terminal T4 of the first power module PM1, and The connection portion b14 is connected to the other diode terminal T6 of the first power module PM1. On the other hand, in the second bus bar B2, the connection portion b22 is connected to the first transistor power terminal T1 of the second power module PM2, and the connection portion b23 is connected to the third transistor power terminal T3 of the second power module PM2. The connecting portion b24 is connected to one diode terminal T5 of the second power module PM2.

  On the other hand, the third bus bar B3 and the fourth bus bar B4 constituting the second pair are, as shown in FIG. 1A, the first power module PM1 and the second power module arranged in the vertical direction (first direction). Among the two sides of PM2, the first transistor power terminal T1, the third transistor power terminal T3, and one diode terminal T5 of the first power module PM1 (second transistor power terminal T2, second power module PM2, second transistor power terminal T2; 4 transistor power terminal T4 and the other diode terminal T6), that is, on the side close to the terminal row that outputs the converted power, and one surface faces each other across the second insulating plate I2 and the opposite surface Are provided in a state parallel to the placement surface and the main parts (third main part b31 and fourth main part b41) extending in the vertical direction.

  The third main portion b31 and the fourth main portion b41 in the third bus bar B3 and the fourth bus bar B4 exhibit a parasitic capacitance by facing each other across the second insulating plate I2. That is, the third main part b31, the fourth main part b41, and the second insulating plate I2 constitute a noise reducing capacitor. Although not shown, the third main part b31 of the third bus bar B3 is connected to one end of a stator coil of an electric motor described later, and the fourth main part b41 of the fourth bus bar B4 is the other end of the stator coil. It is connected to the.

  Further, of the third bus bar B3 and the fourth bus bar B4, the third bus bar B3 is continuous with the third main part b31 and parallel to the placement surface as shown in FIG. The fourth bus bar B4 includes three connection portions b42, b43, and b44 that are continuous with the fourth main portion b41 and are parallel to the placement surface.

  In the third bus bar B3, the connection part b32 is connected to the first transistor power terminal T1 of the first power module PM1, the connection part b33 is connected to the third transistor power terminal T3 of the first power module PM1, The connection part b34 is connected to the other diode terminal T6 of the second power module PM2. On the other hand, in the fourth bus bar B4, the connection portion b42 is connected to the second transistor power terminal T2 of the second power module PM2, and the connection portion b43 is connected to the fourth transistor power terminal T4 of the second power module PM2. The connection portion b44 is connected to one diode terminal T5 of the first power module PM1.

  As shown in FIG. 2, for example, three of such power conversion devices A are connected in parallel to the DC power source E, and supply driving currents to the three stator coils corresponding to the respective phases of the three-phase motor. The first power conversion device Au supplies a drive current to the U-phase stator coil Lu corresponding to the U phase of the three-phase motor, and the second power conversion device Av is the V phase corresponding to the V phase of the three-phase motor. The drive current is supplied to the stator coil Lv, and the third power converter Aw supplies the drive current to the W-phase stator coil Lw corresponding to the W-phase of the three-phase motor.

  That is, in the three power converters Au, Av, Aw, each first bus bar B1 is connected to the negative electrode of the DC power supply E, and each second bus bar B2 is connected to the positive electrode of the DC power supply E. The third bus bar B3 of the power conversion device Au is connected to one end of the U-phase stator coil Lu, and the fourth bus bar B4 of the power conversion device Au is also connected to the other end of the U-phase stator coil Lu. The third bus bar B3 of the power conversion device Av is connected to one end of the V-phase stator coil Lv, and the fourth bus bar B4 of the power conversion device Av is also connected to the other end of the V-phase stator coil Lv. The third bus bar B3 of the power converter Aw is connected to one end of the W-phase stator coil Lw, and the fourth bus bar B4 of the power converter Aw is connected to the other end of the W-phase stator coil Lw.

  Such a power converter A (power converters Au, Av, Aw) is one of the switching elements configured by two transistors Q1, Q2 of the second power module PM2 and one diode D of the first power module PM1. The other switching leg formed by the leg, two transistors Q1 and Q2 of the first power module PM1 and one diode D of the second power module PM2.

  That is, the power conversion device A (power conversion devices Au, Av, Aw) is a power conversion device serving as a basic unit when driving a multiphase motor, and the number (power conversion device) according to the number of phases of the multiphase motor. By providing the Au, the power conversion device Av, and the power conversion device Aw), the power conversion device capable of driving the multiphase motor is obtained. The three-phase motor is a switched reluctance motor (SR motor). Note that the circuit configuration shown in FIG. 2 is well known as a driving circuit for an SR motor, and therefore detailed description of operations and the like is omitted.

  Below, the characteristic effect of the power converter device A which concerns on 1st Embodiment comprised in this way is demonstrated.

  In this power conversion device A, a first power module PM1 and a second power module PM2 having exactly the same configuration are replaced with a pair of diode terminals T5 and T6 of the first power module PM1 and a pair of diodes of the second power module PM2. The main portions (first main portion b11 and first main portion b1) of the first bus bar B1 and the second bus bar B2 that are disposed in the vertical direction in a reverse orientation so that the terminals T5 and T6 are adjacent to each other and constitute one pair 2 main portions b21) are used for the second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6 of the first power module PM1 (first transistor power terminal T1, second power module PM2; 3 transistor power terminal T3 and one diode terminal T5), that is, on the side close to the terminal row for inputting DC power, The third bus bar B3 and the fourth bus bar B4 constituting the other pair are connected to the first transistor power terminal T1, the third transistor power terminal T3, and one diode terminal T5 (second power module) of the first power module PM1. The second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6 of PM2, that is, the terminal near the terminal row for outputting the converted power.

  As a result, as shown in FIG. 1 (a), three connecting parts b12, b13, b14 continuous from the first main part b11 of the first bus bar B1, and 3 continuous from the second main part b21 of the second bus bar B2. Three connection portions b22, b23, b24, three connection portions b32, b33, b34 continuous from the third main portion b31 of the third bus bar B3 and three connection portions b42 continuous from the fourth main portion b41 of the fourth bus bar B4 , B43, b44 can be minimized. That is, the first bus bar B1 and the second bus bar B2 constituting the first pair can be minimized.

  Therefore, according to the power conversion device A according to the first embodiment, the stray inductance in the first bus bar B1 and the second bus bar B2 constituting one pair is suppressed, and thus the first power module PM1 and the second power It is possible to sufficiently reduce the surge voltage when the two transistors Q1 and Q2 of the module PM2 are turned on / off.

  For such a power converter A, for example, when the first power module PM1 and the second power module PM2 are arranged in the vertical direction in the same posture instead of the reverse posture as in the reference example shown in FIG. The length of the first bus bar Ba corresponding to the first bus bar B1 of the power conversion device A is longer than that of the first bus bar B1, the stray inductance is larger than that of the power conversion device A, and the first power module PM1 and the first power module PM1. The surge voltage when the two transistors Q1 and Q2 of the two-power module PM2 are turned on / off cannot be sufficiently reduced.

  In FIG. 3, the second bus bar Bb corresponds to the second bus bar B2 of the power converter A, the third bus bar Bc corresponds to the third bus bar B3 of the power converter A, and the fourth bus bar Bd corresponds to the power converter. This corresponds to the fourth bus bar B4 of the device A. That is, in the reference example shown in FIG. 3, the first bus bar Ba is a connecting conductor that connects the negative electrode of the DC power source E and one DC power input terminal of the power converter A, and the second bus bar Bb is a DC power source. E is a connecting conductor that connects the positive electrode of E and the other DC power input end of the power converter A, and the third bus bar Bc connects one end of the stator coil and one converted power output end of the power converter A. The fourth bus bar Bd is a connection conductor that connects the other end of the stator coil and the other converted power output end of the power converter A.

  Moreover, according to the power converter device A which concerns on 1st Embodiment, since the shape of 1st bus-bar B1 and 2nd bus-bar B2 which comprises one pair is simpler than the reference example shown in FIG. 3, cost reduction is implement | achieved. It is possible.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4A, the power conversion device S of the second embodiment includes a pair of power modules (first power module PM3 and second power module PM4) as one pair of the first power module PM3. The first transistor power terminal T1 and the second transistor power terminal T2 constituting one pair of the first transistor power terminal T1, the second transistor power terminal T2, and the second power module PM4 are adjacent to each other. The main parts (first main part b51 and second main part b61) of the first bus bar B5 and the second bus bar B6 constituting one pair are arranged in the vertical direction in the opposite orientation, and the first power module PM3. The first transistor power terminal T1, the third transistor power terminal T3, and one diode terminal T5 (the second transistor of the second power module PM4). The power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6), that is, the terminals closer to the terminal row for inputting DC power.

  That is, the pair of power modules (the first power module PM3 and the second power module PM4) in the power conversion device S is different from the power conversion device A according to the first embodiment described above, and is one of the first power modules PM3. The first transistor power terminal T1, the second transistor power terminal T2, and the first transistor power terminal T1 and the second transistor power terminal T2 that form one pair of the second power module PM4 Although adjacently arranged so as to be adjacent to each other, they are arranged adjacent to each other in the postures opposite to each other in the vertical direction (first direction) on the placement surface.

  Note that the pair of power modules (first power module PM3 and second power module PM4) in the power conversion device S are the same as the first power module PM1 and the second power module PM1 of the first embodiment as shown in FIG. 4B. In comparison with the power module PM2, the diode D is accommodated in the opposite direction. That is, in the pair of power modules (first power module PM3 and second power module PM4), the anode of the diode D is connected to one diode terminal T5, and the cathode is connected to the other diode terminal T6.

  Of the first bus bar B5 and the second bus bar B6, the first main part b51 of the first bus bar B5 is connected to the negative electrode of the DC power source E, and the second main part b61 of the second bus bar B6 is It is connected to the positive electrode of the DC power source E. Further, the first main part b51 and the second main part b61 are opposed to each other with the insulating plate I3 interposed therebetween, so that the first main part b51, the second main part b61 and the insulating plate I3 constitute a smoothing capacitor C2. .

  Further, of the first bus bar B5 and the second bus bar B6, as shown in FIG. 4A, the first bus bar B5 continues to the first main part b51 and is parallel to the placement surface. The second bus bar B6 includes three connection portions b62, b63, and b64 that are continuous with the second main portion b61 and parallel to the placement surface.

  That is, in the first bus bar B5, the connection part b52 is connected to one diode terminal T5 of the first power module PM3, the connection part b53 is connected to the second transistor power terminal T2 of the second power module PM4, and The connection portion b54 is connected to the fourth transistor power terminal T4 of the second power module PM4. On the other hand, in the second bus bar B6, the connection portion b62 is connected to the other diode terminal T6 of the second power module PM2, the connection portion b63 is connected to the first transistor power terminal T1 of the first power module PM3, and The connection portion b64 is connected to the third transistor power terminal T3 of the first power module PM3.

  In addition, in this power converter device S, 3rd bus-bar B7 and 4th bus-bar B8 which comprise the other pair are formed in linear form, as shown to Fig.4 (a). The third bus bar B7 is connected to the second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6 of the first power module PM3. On the other hand, the fourth bus bar B8 is connected to the first transistor power terminal T1, the third transistor power terminal T3, and one diode terminal T5 of the second power module PM4.

  In this power conversion device S, a pair of power modules (first power module PM3 and second power module PM4) having exactly the same configuration is used as a first transistor power terminal constituting one pair of the first power module PM3. Longitudinal direction in a reverse orientation so that the first transistor power terminal T1 and the second transistor power terminal T2 constituting one pair of T1, the second transistor power terminal T2, and the second power module PM4 are adjacent to each other. And the main parts (first main part b51 and second main part b61) of the first bus bar B5 and the second bus bar B6 constituting one pair are connected to the first transistor power terminal T1 of the first power module PM3. , A third transistor power terminal T3 and one diode terminal T5 (second transistor power of the second power module PM4). The power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6), that is, the terminals close to the terminal row for inputting DC power.

  As a result, as shown in FIG. 4A, three connection portions b52, b53, and b54 that are continuous from the first main portion b51 of the first bus bar B5, and three that are continuous from the second main portion b61 of the second bus bar B6. It is possible to minimize the length of the two connecting portions b62, b63, and b64. Therefore, according to the power conversion device S according to the second embodiment, the stray inductance in the first bus bar B5 and the second bus bar B6 constituting one pair is suppressed, and thus the first power module PM3 and the second power It is possible to sufficiently reduce the surge voltage when the two transistors Q1 and Q2 of the module PM4 are turned on / off. That is, the first bus bar B5 and the second bus bar B6 can be minimized.

  Then, with reference to FIG. 5, the power converter device Z which concerns on the modification of 2nd Embodiment is demonstrated.

  This power conversion device Z employs a pair of power modules (first power module PM3 and second power module PM4) having exactly the same configuration as the power conversion device S described above. As shown, the first power module PM3 and the second power module PM4 are arranged adjacent to each other in the horizontal direction instead of the vertical direction, and one pair is provided between the first power module PM3 and the second power module PM4. The main parts (the first main part b91 and the second main part b101) of the first bus bar B9 and the second bus bar B10 constituting the same are arranged.

  Of the first bus bar B9 and the second bus bar B10, as shown in FIG. 5, the first bus bar B9 is connected to the first main part b91 and is connected to the three connecting parts b92, b93 parallel to the placement surface. , B94, and the second bus bar B10 includes three connection portions b102, b103, b104 that are continuous with the second main portion b101 and parallel to the placement surface. The first main portion b91 and the second main portion b101 are opposed to each other with the insulating plate I4 interposed therebetween. Therefore, the first main portion b91, the second main portion b101, and the insulating plate I4 constitute a smoothing capacitor C3. .

  That is, in the first bus bar B9, the connection portion b92 is connected to the second transistor power terminal T2 of the first power module PM3, and the connection portion b93 is connected to the fourth transistor power terminal T4 of the first power module PM3. The connection portion b94 is connected to one diode terminal T5 of the second power module PM4. On the other hand, in the second bus bar B10, the connection part b102 is connected to the other diode terminal T6 of the first power module PM3, the connection part b103 is connected to the third transistor power terminal T3 of the second power module PM4, and The connection b104 is connected to the first transistor power terminal T1 of the second power module PM4.

  In the power conversion device Z, the third bus bar B11 and the fourth bus bar B12 constituting the other pair are formed in a straight line as shown in FIG. The third bus bar B11 is connected to the first transistor power terminal T1, the third transistor power terminal T3, and one of the diode terminals T5 of the first power module PM3. On the other hand, the fourth bus bar B12 is connected to the second transistor power terminal T2, the fourth transistor power terminal T4, and the other diode terminal T6 of the second power module PM4.

  In such a power conversion device Z, a pair of power modules (the first power module PM3 and the second power module PM4) having the same configuration are arranged so as to be adjacent in the lateral direction in the same posture, and the first power The main parts (first main part b91 and second main part b101) of the first bus bar B9 and the second bus bar B10 constituting one pair are arranged between the module PM3 and the second power module PM4.

  As a result, as shown in FIG. 5, three connection portions b92, b93, b94 continuous from the first main portion b91 of the first bus bar B9, and three connection portions continuous from the second main portion b101 of the second bus bar B10. It is possible to minimize the lengths of b102, b103, and b104. Therefore, according to the power conversion device Z according to the modified example of the second embodiment, the first bus bar B9 and the second bus bar B10 constituting one pair can be shortened, so that the stray inductance is suppressed, and thus the first It is possible to sufficiently reduce the surge voltage when the two transistors Q1 and Q2 of the first power module PM3 and the second power module PM4 are turned on / off.

  In the power conversion device Z, as shown in FIG. 5, the first power module PM3 and the second power module PM4 arranged in the horizontal direction are arranged slightly shifted in the vertical direction. That is, the first power module PM3 is located above the second power module PM4 in the vertical direction. Such displacement (arrangement offset) in the vertical direction of the first power module PM3 and the second power module PM4 is caused by bending the conductive plate, for example, by 90 °, and the first main portion b91 of the first bus bar B9 and the first bus bar. This is because the connecting portions b92, b93, and b94 of B9 are formed in a posture in which the second main portion b101 and the connecting portions b102, b103, and b104 of the second bus bar B10 are different by 90 °.

  That is, when the arrangement offset is not provided, the connecting portion of the first bus bar B9 in the extending direction (vertical direction) of the first main portion b91 of the first bus bar B9 and the second main portion b101 of the second bus bar B10. Since b92, b93, b94 and the connecting portions b102, b103, b104 of the second bus bar B10 are in the same position, the first bus bar B9 and the second bus bar B10 cannot be realized by bending the conductive plate.

In addition, this invention is not limited to said each embodiment, For example, the following modifications can be considered.
(1) In the above embodiments, the first power module PM1 and the second power module PM2 that accommodate two transistors Q1, Q2 and one diode D are used. However, the present invention is not limited to this. The present invention can be applied to, for example, a power module that accommodates one transistor and a diode D, or a power module that accommodates three or more transistors Q1 and Q2 and two or more diodes D.

  The semiconductor switching elements housed in the pair of power modules are not limited to the transistors Q1 and Q2 and the diode D. For example, all of the semiconductor switching elements housed in each power module may be transistors. Further, these transistors are not limited to IGBTs, and may be various known transistors (for example, junction type or MOS type field effect transistors).

(2) In each of the above embodiments, the capacitor is obtained by sandwiching the first insulating plate I1 between the first main part b11 of the first bus bar B1 and the second main part b21 of the second bus bar B2 constituting one pair. Although C1, C2, and C3 are configured, the present invention is not limited to this. For example, only a film capacitor (electronic component) having a predetermined capacitance may be provided between the first main part b11 and the second main part b21 without sandwiching the first insulating plate I1.

(3) In each of the above embodiments, the case where the present invention is applied to the drive circuit of a three-phase SR motor (electric motor) has been described, but the present invention is not limited to this. The present invention can be applied to electric motors other than SR motors.

(4) In each of the above embodiments, the case where the present invention is applied to the drive circuit of a three-phase SR motor (electric motor) has been described, but the present invention is not limited to this. In the present invention, for example, the DC power source E (2) is used as the secondary battery, and the regenerative power regenerated from the motor or the generated power generated by the generator is taken as external power through the second connection conductor. The present invention is also applicable to a power conversion device (charging circuit) that charges a secondary battery.

PM1 1st power module (switching module)
PM2 Second power module (switching module)
B1 First bus bar (first connecting conductor)
B2 Second bus bar (first connecting conductor)
B3 Third bus bar (second connecting conductor)
B4 4th bus bar (2nd connecting conductor)
I1 1st insulating plate I2 2nd insulating plate Q1, Q2 Transistor (semiconductor switching element)
D Diode (Semiconductor switching element)
T1, T2, T3, T4 Transistor power terminal T5, T6 Diode terminal T7 Transistor control terminal T8, T9 Auxiliary power terminal

Claims (5)

A plurality of semiconductor switching elements and a plurality of pairs of power terminals respectively connected to a pair of input / output terminals that input and output power in the semiconductor switching elements are provided, and the power terminals of each pair are parallel to each other in the first direction A pair of arranged switching modules;
A pair of first connection conductors connected to a part of the power terminal and supplying DC power supplied from the outside to the part or supplying DC power output from the part to the outside;
A power conversion device comprising: a pair of second connection conductors connected to the remainder of the power terminal and supplying the converted power output from the remainder or external power supplied from the outside;
The pair of switching modules are arranged adjacent to each other in a predetermined posture and a predetermined direction,
The pair of first connection conductors extends in the first direction on a side closer to the part in an arrangement direction of the pair of power terminals in the pair of switching modules.   The power converter according to claim 1, wherein the pair of switching modules are disposed adjacent to each other in a posture opposite to each other in the first direction.   The power converter according to claim 1, wherein the pair of switching modules are disposed adjacent to each other in the same orientation and in the arrangement direction of the pair of power terminals.   4. The power conversion device according to claim 1, comprising a number corresponding to the number of phases of an electric motor that supplies the converted power. 5. The electric motor is a switched reluctance motor;
The plurality of semiconductor switching elements are one or a plurality of transistors and one diode, and are driven by the pair of first connection conductors and the pair of second connection conductors to drive the switched reluctance motor. The power conversion device according to claim 4, comprising a pair of switching legs.

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