JP2013005579A - Power module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power module which can reduce different surge voltages caused by inductance components that differ between a plurality of circuit parts, and can reduce overall costs of an apparatus.SOLUTION: Snubber terminals P13 and P14 are disposed above a third edge part opposed to a first edge part having input terminals P11 and P12 disposed thereon, and an auxiliary snubber circuit 22 is disposed between the snubber terminals P13 and P14, thereby disposing the auxiliary snubber circuit 22 at a position most separated from the snubber circuit 21 formed between the input terminals P11 and P12. Cross-sectional areas of the snubber terminals P13 and p14 in a plan view are respectively reduced to one-half or less of cross-sectional areas of the input terminals P11 and P12 in a plan view by, for example, reducing formation widths of the snubber terminals P13 and P14 to one-half or less of a formation width of the input terminal P12.

Description

  The present invention relates to a power module including one or more power semiconductor elements that convert power from direct current to alternating current.

  When a power semiconductor element such as an IGBT (insulated gate bipolar transistor) in the power module operates, the inductance L of the wiring inside and outside the package (outside the input terminal when viewed from the semiconductor element) becomes the surge voltage VS. Is superimposed on the output (VS = −L · di / dt). At this time, by providing a snubber circuit in the vicinity of the power semiconductor element such as the input terminal portion of the package, the influence of the wiring inductance outside the package can be reduced, and the generation of the surge voltage VS can be suppressed.

  Conventionally, a power module corresponding to one phase or one arm (half of one phase) is wired in parallel or in series using a bus bar or the like, and used as a multi-phase power module for power conversion or the like. At this time, by providing a snubber circuit at the input terminal portion of each phase, the surge voltage due to the wiring inductance between the outside of the package and between the phases is suppressed.

  In recent years, from the viewpoint of miniaturization, price reduction, and high reliability, as well as improved chip characteristics (miniaturization, higher current density, higher functionality) and improved assembly technology, multiple phases can be combined into one package. The number of power modules installed in the is increasing.

  In such a power module, it is expected that the distance from the DC voltage input terminal to each phase (the power semiconductor element) will not be uniform. Therefore, if a snubber circuit is provided at the input terminal, the snubber circuit (input) Due to the difference in distance from the terminal, the influence of the inductance inside and outside the package in a certain phase increases, and there is a problem that surge voltage increases.

  Therefore, in the power module disclosed in Patent Document 1 and the like, an auxiliary snubber circuit is connected to increase the surge voltage due to an increase in inductance inside the package due to a difference in position from the electrode on the input side provided with the snubber circuit. Was mitigating.

JP 2005-94882 A

  The conventional power module is configured as described above, and by providing a terminal for attaching an auxiliary snubber circuit for the purpose of suppressing surge voltage, the number of terminals of the entire module increases, and there is no designation in the terminal shape. Since it cannot be distinguished, there was a concern about an increase in assembly cost as work efficiency deteriorates due to complicated installation work. Further, there has been no countermeasure for selectively attaching an auxiliary snubber circuit in the vicinity of an arbitrary phase.

  The present invention has been made to solve the above-described problems, and is capable of reducing different surge voltages caused by different inductance components among a plurality of circuit units and reducing the cost of the entire apparatus. The purpose is to obtain a module.

  According to a first aspect of the present invention, there is provided a power module according to a first aspect of the present invention, wherein the power module is provided above a rectangular substrate and a first edge that is one side of the substrate in plan view, and the first and second electrodes of the DC power supply. Are electrically connected to the first and second input terminals and an alternating current provided above the second edge, which is the other side of the substrate adjacent to the first edge, in plan view. A plurality of output terminals, and a plurality of output terminals provided on the substrate, provided in parallel between the first input terminal and the second input terminal, and outputting an AC output signal from the plurality of output terminals. Each of the plurality of circuit units has at least one semiconductor chip, and both are provided above other edges other than the first edge in plan view, and At least one of the first and second edges is above the third edge adjacent to one of the first and second edges. The first and second auxiliary terminals electrically connected to the first and second input terminals, and a snubber circuit can be provided between the first and second input terminals. And an auxiliary snubber circuit may be provided between the first and second auxiliary terminals, and a sectional view of the first and second auxiliary terminals in plan view may be determined by the first input terminal and the second input terminal. It is narrower than the cross-sectional area in plan view.

  In the power module according to the first aspect of the present invention, the auxiliary snubber circuit is provided at a position relatively separated from the snubber circuit, so that different surge voltages caused by different inductance components can be effectively generated between the plurality of circuit portions. Can be reduced.

  In addition, the first and second inputs at the time of assembling can be made by making the sectional view in plan view of the first and second auxiliary terminals smaller than the sectional view in plan view of the first and second input terminals. As a result of facilitating identification between the terminal and the first and second auxiliary terminals and improving the efficiency of the assembly work, the cost of the entire apparatus can be reduced.

It is explanatory drawing which shows the planar structure of the power module which is Embodiment 1 of this invention. It is a circuit diagram which shows the circuit structure of the power module shown in FIG. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 1 typically. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 2 typically. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 3 typically. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 4 typically. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 5 typically. It is explanatory drawing which shows the characteristic of the snubber terminal of Embodiment 6 typically. FIG. 10 is an explanatory view schematically showing the characteristics of a snubber terminal according to a seventh embodiment. FIG. 10 is an explanatory diagram schematically showing the characteristics of a snubber terminal according to an eighth embodiment. FIG. 32 is an explanatory diagram schematically showing the characteristics of the snubber terminal according to the ninth embodiment. FIG. 38 is an explanatory diagram schematically showing the characteristics of the snubber terminal according to the tenth embodiment. FIG. 38 is an explanatory diagram schematically showing the characteristics of the snubber terminal according to the eleventh embodiment.

<Embodiment 1>
FIG. 1 is an explanatory view showing a planar configuration of a power module according to Embodiment 1 of the present invention. As shown in the figure, in the power module 1, conductor bars 31 and 32 and die pads 33 to 35 are selectively formed on a rectangular substrate 30 in plan view, and semiconductor chips 41 to 43 are respectively formed on the conductor bar 31. The semiconductor chip 44 is formed on the die pad 33, the semiconductor chip 45 is formed on the die pad 34, and the semiconductor chip 46 is formed on the die pad 35.

  FIG. 2 is a circuit diagram showing a circuit configuration of the power module 1 shown in FIG. As shown in FIGS. 1 and 2, the semiconductor chip 41 and 44 (elements formed thereon) constitute a circuit unit 51 for outputting an AC output signal OUT1. Similarly, the semiconductor chip 42 and 45 constitute a circuit part 52 for outputting an AC output signal OUT2, and the semiconductor chips 43 and 46 constitute a circuit part 53 for outputting an AC output signal OUT3.

  In the circuit unit 51, N-type IGBTQ11 and IGBTQ12 are connected in series. Flywheel diodes D11 and D12 are provided so that the anode is connected to the emitter of each of IGBTs Q11 and Q12, and the cathode is connected to the collector. A signal obtained from the emitter of the IGBT Q11 (collector of the IGBT Q12) is obtained as an alternating current (U-phase) output signal OUT1 via the output terminal P21. The IGBT Q11 and the diode D11 are provided in the semiconductor chip 41, and the IGBT Q12 and the diode D12 are provided in the semiconductor chip 44.

  Similarly, in the circuit unit 52, the IGBT Q21 and the IGBT Q22 are connected in series, and flywheel diodes D21 and D22 are inserted between the emitters and collectors of the IGBTs Q21 and Q22, respectively. A signal obtained from the emitter of the IGBT Q21 (collector of the IGBT Q22) is obtained as an alternating current (V phase) output signal OUT2 via the output terminal P22. The IGBT Q21 and the diode D21 are provided in the semiconductor chip 42, and the IGBT Q22 and the diode D22 are provided in the semiconductor chip 45.

  Similarly, in the circuit unit 53, series connection of IGBTQ31 and IGBTQ32, and flywheel diodes D31 and D32 are inserted between the emitters and collectors of IGBTQ31 and Q32, respectively. A signal obtained from the emitter of the IGBT Q31 (the collector of the IGBT Q32) is obtained as an alternating current (W-phase) output signal OUT3 via the output terminal P23. The IGBT Q21 and the diode D31 are provided in the semiconductor chip 43, and the IGBT Q22 and the diode D32 are provided in the semiconductor chip 46.

  A predetermined control signal (not shown) is applied to each gate electrode and emitter electrode of IGBTs Q11, Q12, Q21, Q22, Q31 and Q32.

  The collectors of IGBTs Q11, Q21, and Q31, the cathodes of diodes D11, D21, and D31 are connected to internal wiring 61, the collectors of IGBTs Q12, Q22, and Q32, and the cathodes of diodes D12, D22, and D32 are connected to internal wiring 62. .

  The internal wirings 61 and 62 are electrically connected to the conductor bars 31 and 32, and the internal wiring 61 and the conductor bar 31, the internal wiring 62 and the conductor bar 32 form an internal wiring part, respectively. An input terminal P11 and a snubber terminal P13 are electrically connected to the conductor bar 31, and an input terminal P12 and a snubber terminal P14 are electrically connected to the conductor bar 32.

  The positive terminal of the DC power supply 20 is connected to the input terminal P11, the negative electrode of the DC power supply 20 is connected to the input terminal P12, and the snubber circuit 21 is inserted between the input terminals P11 and P12. An auxiliary snubber circuit 22 is provided between the snubber terminals P13 and P14.

  Returning to FIG. 1, DC power supply input terminals P <b> 11 and P <b> 12 (first and second input terminals) are provided above a first edge portion that is the left side of the substrate 30 in plan view. The snubber circuit 21 is connected between the input terminals P11 and P12 by screwing or the like. Further, the input terminal P12 also functions as an electrode connected to the positive electrode and the negative electrode of the DC power supply 20.

  Then, output terminals P21 to P23 for AC output signals OUT1 to OUT3 are provided above the second edge which is the lower side in the figure adjacent to the first edge of the substrate 30 in plan view.

  On the other hand, in plan view, snubber terminals P13 and P14 (first and second auxiliary terminals) are provided above the third edge portion, which is the right side in the drawing, facing the first edge portion of the substrate 30. The auxiliary snubber circuit 22 is connected between the snubber terminals P13 and P14 by screwing or the like.

  In a situation where the current changes suddenly, such as when the current to the IGBT, which is a power semiconductor element, is interrupted, a loop (current path) in which the inductance from the input terminals P11 and P12 to the IGBT is minimized, Hall exchange occurs. As this loop becomes larger, the inductance increases, and the surge voltage VS increases according to the equation “VS = L · di / dt”. By providing the snubber circuit 21 on the PN wiring such as the input terminals P11 and P12, it is possible to reduce the influence of the external inductance as compared with the snubber circuit when viewed from the power semiconductor element.

  However, when the distances from the input terminals P11 and P12 to the respective circuit units 51 to 53 are not constant among the plurality of circuit units 51 to 53, the current paths R1 to R3 of the circuit units 51 to 53 are the paths R1, R3. It becomes longer in the order of R2 and R3. As a result, the surge voltage VS increases in proportion to the distance (internal inductance difference) from the input terminals P11 and P12. On the other hand, the surge voltage reduction effect by the snubber circuit 21 becomes smaller in proportion to the distance from the snubber circuit 21. Therefore, in the configuration in which the snubber circuit 21 is provided between the input terminals P11 and P12, the tendency that the surge voltage VS increases in the order of the circuit unit 51, the circuit unit 52, and the circuit unit 53 cannot be effectively suppressed.

  In the first embodiment, in the power module 1 having a plurality of circuit portions 51 to 53 for phases, the snubber terminal P13 is located above the third edge that faces the first edge where the input terminals P11 and P12 are provided. And P14, and an auxiliary snubber circuit 22 is provided between the snubber terminals P13 and P14.

  Therefore, since the distance from the auxiliary snubber circuit 22 becomes closer in the order of the circuit unit 51, the circuit unit 52, and the circuit unit 53, the surge voltage suppression effect works in the order of the circuit unit 51 to the circuit unit 53 described above. The tendency that the surge voltage VS increases in the order of the circuit unit 51 to the circuit unit 53 described above can be effectively suppressed, and an excellent surge voltage suppressing effect can be exhibited as the power module 1 as a whole.

  FIG. 3 is an explanatory diagram schematically showing the characteristics of the snubber terminals P13 and P14 of the first embodiment. As shown in the figure, the cross-sectional areas of the snubber terminals P13 and P14 in plan view are reduced by reducing the formation widths W13 and W14 of the snubber terminals P13 and P14 to less than half of the formation widths W11 and W12 of the input terminal P12. The input terminals P11 and P12 are suppressed to less than half of the sectional area in plan view.

  As the cross-sectional areas of the snubber terminals P13 and P14 are reduced, the size of the snubber terminals P13 and P14 and related parts can be reduced. Therefore, the cost of the entire power module 1 can be reduced. Further, by making the cross-sectional areas of the input terminals P11 and P12 and the snubber terminals P13 and P14 different, the input terminals P11 and P12 and the snubber terminals P13 and P14 are identified when the snubber circuit 21 and the auxiliary snubber circuit 22 are assembled. As a result, the assembly process can be simplified. Therefore, the cost of the semiconductor module 1 can be reduced due to the efficiency of assembly work.

  Further, when the semiconductor module 1 has a configuration specialized for high-frequency components, there is almost no adverse effect caused by making the cross-sectional areas of the snubber terminals P13 and P14 narrower than the input terminals P11 and P12.

<Embodiment 2>
FIG. 4 is an explanatory diagram schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 2 of the second embodiment. As shown in the drawing, the mounting holes h13 and h14 for screwing the auxiliary snubber circuit 22 provided in the snubber terminals P13 and P14 are provided in the input terminals P11 and P12, and the mounting holes h11 for screwing the snubber circuit 21. And smaller than 1 mm or more from the diameter of h12 (about 5 to 15 mm). The planar configuration and circuit configuration of the power module 2 are the same as those shown in FIGS. 1 and 2 except for the mounting holes h13 and h14 of the snubber terminals P13 and P14.

  As described above, the power module 2 according to the second embodiment is provided with the attachment for the snubber circuit 21 as the attachment screw for the auxiliary snubber circuit 22 as the diameters of the attachment holes h13 and h14 of the snubber terminals P13 and P14 are shortened. The cost of the power module 2 as a whole can be reduced by using relatively inexpensive parts required for mounting the auxiliary snubber circuit 22 such as the use of a screw that is less expensive than the use screw.

<Embodiment 3>
FIG. 5 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 3 of the third embodiment. As shown in the figure, the snubber terminals P13 and P14 are configured in a pin shape. The auxiliary snubber circuit 22 and the snubber terminals P13 and P14 are connected by soldering.

  The planar configuration and circuit configuration of the power module 3 are the same as those shown in FIGS. 1 and 2 except that the snubber terminals P13 and P14 have a pin shape.

  As described above, in the power module 3 according to the third embodiment, the snubber terminals P13 and P14 have a pin shape. Therefore, the auxiliary snubber circuit 22 is attached to the snubber terminals P13 and P14 by soldering. Reliability can be improved.

<Embodiment 4>
FIG. 6 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 4 of the fourth embodiment. 6 schematically shows a cross-sectional structure of the AA cross section of FIG. 3 shown in the first embodiment.

  As shown in the figure, the formation height H13 of the snubber terminal P13 (the height at which the auxiliary snubber circuit 22 is attached (the height at which the auxiliary snubber circuit 22 is positioned)) is defined as the formation height H11 of the input terminal P11 (snubber). It is configured to be lower than the height at which the circuit 21 is attached (the height at which the snubber circuit 21 is positioned at the bottom). The substrate 30 (the conductor bars 31 and 32, the semiconductor chips 41 to 46 and the like are not shown) is provided on the case 70, and an input terminal is provided from one side surface (the left side surface in the figure) of the case 70 via the bus bar 71. P11 is provided, and a snubber terminal P13 is provided from the other side surface (right side surface in the drawing) of the case 70 via the bus bar 73. By making the length of the bus bar 73 in the vertical direction shorter than the length of the bus bar 71, the formation height H13 from the surface of the case 70 is set lower than the formation height H11. Both bus bars 71 and 73 are electrically connected to the conductor bar 31 (see FIG. 1).

  The bus bar 71 and the input terminal P11, and the bus bar 73 and the snubber terminal P13 may be integrally formed. The configuration shown in FIG. 6 is merely an example, and it is conceivable that the formation height H13 of the snubber terminal P13 is made lower than the formation height H11 of the input terminal P11 using another structure.

  Further, although not shown in FIG. 6, the input terminal P12 and the snubber terminal P14 are provided so as to have the formation heights H11 and H13 from the surface of the case 70, similarly to the input terminal P11 and the snubber terminal P13, respectively. However, the bus bars for the input terminal P12 and the snubber terminal P14 are both electrically connected to the conductor bar 32 (see FIG. 1). The planar configuration and circuit configuration of the power module 4 are the same as those shown in FIGS. 1 and 2 except that the formation heights of the snubber terminals P13 and P14 are different.

  As described above, in the power module 4 according to the fourth embodiment, the formation height H13 of the snubber terminals P13 and P14 is lower than the formation height H11 of the input terminals P11 and P12. Therefore, in the power module 4 according to the fourth embodiment, the circuit formed in the auxiliary snubber circuit 22 and the semiconductor chips 41 to 46 on the substrate 30 is compared with the case where the formation height H13 is formed to be approximately the same as the formation height H11. As a result of shortening the distance to each of the parts 51 to 53 and shortening the wiring length, the effect of reducing the surge voltage to the circuit parts 51 to 53 by the auxiliary snubber circuit 22 can be further enhanced.

<Embodiment 5>
FIG. 7 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 5 of the fifth embodiment. 7 schematically shows the cross-sectional structure of the AA cross section of FIG. 3 shown in the first embodiment.

  As shown in the figure, the formation height H13 of the snubber terminal P13 is configured to be higher than the formation height H11 of the input terminal P11. The substrate 30 is provided on the case 70, and an input terminal P11 is provided from one side surface (left side surface in the figure) of the case 70 via the bus bar 71, and from the other side surface (right side surface in the figure) of the case 70. A snubber terminal P13 is provided via the bus bar 74. By making the length of the bus bar 74 in the vertical direction longer than the length of the bus bar 71, the formation height H13 from the surface of the case 70 is set higher than the formation height H11. Both bus bars 71 and 74 are electrically connected to the conductor bar 31 (see FIG. 1).

  The bus bar 71 and the input terminal P11, and the bus bar 74 and the snubber terminal P13 may be integrally formed. Further, the configuration shown in FIG. 7 is merely an example, and it is conceivable that the formation height H13 of the snubber terminal P13 is made higher than the formation height H11 of the input terminal P11 using another structure.

  Further, although not shown in FIG. 7, the input terminal P12 and the snubber terminal P14 are provided so as to have the formation heights H11 and H13 from the surface of the case 70, similarly to the input terminal P11 and the snubber terminal P13, respectively. However, the bus bars for the input terminal P12 and the snubber terminal P14 are both electrically connected to the conductor bar 32 (see FIG. 1). The planar configuration and circuit configuration of the power module 5 are the same as those shown in FIGS. 1 and 2 except that the formation heights of the snubber terminals P13 and P14 are different.

  As described above, in the power module 5 of the fifth embodiment, the formation height H13 of the snubber terminals P13 and P14 is higher than the formation height H11 of the input terminals P11 and P12. Therefore, in the power module 5 of the fifth embodiment, by extending the distance between the auxiliary snubber circuit 22 and the circuit units 51 to 53 as compared with the case where the formation height H13 is formed to be approximately the same as the formation height H11, The auxiliary snubber circuit 22 can be arranged high. For this reason, the power module 5 of the fifth embodiment has an influence when the auxiliary snubber circuit 22 is attached to the board (control board) outside the module on which the wiring of a predetermined control signal is mounted and the output terminals P21 to P23. As a result, the assembly process can be simplified.

<Embodiment 6>
FIG. 8 is an explanatory diagram schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 6 of the sixth embodiment. As shown in the figure, the distance d13 between the snubber terminals P13 and P14 is made shorter than the distance d11 between the input terminals P11 and P12. The planar configuration and circuit configuration of the power module 6 are the same as those shown in FIGS. 1 and 2 except for the distance d13 between the snubber terminals P13 and P14.

  As described above, in the power module 6 of the sixth embodiment, the wiring length is reduced by shortening the distance between the auxiliary snubber circuit 22 and the circuit units 51 to 53 as the distance d13 between the snubber terminals P13 and P14 is shortened. As a result of shortening, the effect of reducing the surge voltage to each of the circuit portions 51 to 53 by the auxiliary snubber circuit 22 can be further enhanced.

  The distance d13 between the snubber terminals P13 and P14 needs to be set to a length that maintains at least the insulation between each other.

<Embodiment 7>
FIG. 9 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 7 of the seventh embodiment. As shown in the figure, the third end portion where the snubber terminals P13 and P14 are both formed upward is one side of the substrate 30 facing the first edge portion where the input terminals P11 and P12 are formed upward ( The right side in the figure). The planar configuration and circuit configuration of the power module 7 are the same as those shown in FIGS.

  As described above, in the power module 7 according to the seventh embodiment, by providing the auxiliary snubber circuit 22 at the position farthest from the snubber circuit 21, different surge voltages caused by components in different inductances between the circuit units 51 to 53 are generated. It can be reduced most effectively. This is because the auxiliary snubber circuit 22 can exhibit a surge voltage suppression effect that increases toward the circuit portions 51 to 53 with respect to the circuit portions 51 to 53 whose inductance components increase in the order of the circuit portions 51 to 53.

  In the first to sixth embodiments shown in FIGS. 3 to 8, the third end where the snubber terminals P <b> 13 and P <b> 14 are formed upward is the input terminal P <b> 11 as in the seventh embodiment. And one side of the substrate 30 facing the first edge where P12 is formed. Therefore, the same effects as those of the seventh embodiment can also be exhibited in the first to sixth embodiments.

<Eighth embodiment>
FIG. 10 is an explanatory diagram schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 8 of the eighth embodiment. As shown in the figure, the third end portion where the snubber terminals P13 and P14 are both formed upward is one side of the same substrate 30 as the second edge portion where the output terminals P21 to P23 are formed (in the drawing). Lower side). Except for the arrangement contents of the snubber terminals P13 and P14, the planar configuration and circuit configuration of the power module 8 are the same as those shown in FIGS.

  In the power module 8 of the eighth embodiment having such a configuration, the snubber terminals P13 and P14 are provided above the output terminals P21 to P23, thereby overlapping the output terminals P21 to P23 and the snubber terminals P13 and P14 in plan view. As a result, it is possible to reduce the entire mounting area.

  The first to sixth embodiments shown in FIG. 3 to FIG. 8 have the same effects as the eighth embodiment by arranging the snubber terminals P13 and P14 as in the eighth embodiment. It can be demonstrated.

<Embodiment 9>
FIG. 11 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 9 of the ninth embodiment. As shown in the figure, the third end where the snubber terminals P13 and P14 are both formed upward is one side of the substrate 30 facing the second edge where the output terminals P21 to P23 are formed (in the figure). Upper side). The planar configuration and circuit configuration of the power module 9 are the same as those shown in FIGS. 1 and 2 except for the arrangement contents of the snubber terminals P13 and P14.

  Thus, in the power module 9 according to the ninth embodiment, the snubber terminals P13 and P14 are not provided on the edge (the right side in the figure) facing the input terminals P11 and P12. Effective use of the opposite edges can be achieved.

  The first to sixth embodiments shown in FIG. 3 to FIG. 8 have the same effects as the ninth embodiment by arranging the snubber terminals P13 and P14 as in the ninth embodiment. It can be demonstrated.

<Embodiment 10>
FIG. 12 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 10 of the tenth embodiment. As shown in the figure, the third end where the snubber terminal P13, which is one of the snubber terminals P13 and P14, is formed upward is the first edge where the input terminals P11 and P12 are formed upward. The fourth end portion on one side (right side in the drawing) of the opposing substrate 30 and the other side where the snubber terminal P14 is formed is the substrate facing the second edge portion on which the output terminals P21 to P23 are formed. 30 on one side (right side in the figure).

  As described above, the power module 10 of the tenth embodiment is different in inductance between the circuit units 51 to 53 by providing the snubber terminal P13 at the position farthest from the input terminals P11 and P12, as in the seventh embodiment. Different surge voltages caused by components can be reduced more effectively. In addition, since the snubber terminal P14 is formed at the fourth edge that faces the second edge where the output terminals P21 to P23 are formed, the degree of freedom of arrangement of the output terminals P21 to P23 is not affected. .

  Further, by providing the snubber terminals P13 and P14 above the third end and the fourth end so that the distance between the snubber terminal P13 and the snubber terminal P14 is relatively short, the auxiliary snubber circuit 22 and The high surge voltage reduction effect accompanying shortening of wiring length with the circuit parts 51-53 can be exhibited.

  3 to 8, the snubber terminals P13 and P14 are arranged in the same manner as in the tenth embodiment, so that the same effects as those in the tenth embodiment can be obtained. It can be demonstrated.

<Embodiment 11>
FIG. 13 is an explanatory view schematically showing the characteristics of the snubber terminals P13 and P14 that are the power module 11 of the eleventh embodiment. As shown in the figure, the third end where the snubber terminal P13 which is one of the snubber terminals P13 and P14 is formed is opposed to the first edge where the input terminals P11 and P12 are formed. The fourth end where one side (right side in the figure) of the substrate 30 and the other snubber terminal P14 are formed is the same side as the second edge where the output terminals P21 to P23 are formed (see the figure). Middle lower side).

  As described above, the power module 11 of the eleventh embodiment is different in inductance between the circuit units 51 to 53 by providing the snubber terminal P13 at the position farthest from the input terminals P11 and P12, as in the seventh embodiment. Different surge voltages caused by components can be reduced more effectively.

  Further, by providing the snubber terminal P14 above the output terminals P21 to P23, it is possible to provide the output terminals P21 to P23 and the snubber terminal P14 in a plan view overlapping with each other. The area can be reduced.

  The first to sixth embodiments shown in FIG. 3 to FIG. 8 have the same effects as the eleventh embodiment by arranging the snubber terminals P13 and P14 as in the eleventh embodiment. It can be demonstrated.

<Common concept in Embodiments 1 to 11>
The arrangements of the snubber terminals P13 and P14 shown in the first to eleventh embodiments all satisfy the following requirements (1) and (2).

  (1) Snubber terminals P13 and P14 are provided above other edges other than the first edge where the input terminals P11 and P12 are formed.

  (2) At least one of the snubber terminals P13 and P14 above the third edge adjacent to one of the first edge and the second edge where the output terminals P21 to P23 are formed. Provided.

  Therefore, as a common effect of the first to eleventh embodiments, by providing the auxiliary snubber circuit 22 at a position relatively away from the snubber circuit 21, an inductance component that differs between the circuit units 51 to 53 is obtained. There is an effect that it is possible to effectively reduce different generated surge voltages.

<Others>
In the above-described embodiment, a power module that outputs a three-phase AC signal as the output signals OUT1 to OUT3 has been described. However, the number of output AC signals is not limited to three as long as it is plural.

  In the above-described embodiment, the combination structure of the IGBT and the flywheel diode is shown as the semiconductor element provided in the semiconductor chips 41 to 46. However, another semiconductor element such as a MOSFET is used instead of the combination structure. Of course, it is also conceivable to use.

  Furthermore, in the above-described embodiment, the configuration in which only one set of snubber terminals P13 and P14 for the auxiliary snubber circuit 22 is provided. However, the above requirements (1) and (2) are satisfied, and another one is provided. A configuration in which a pair of snubber terminals P13 and P14 (corresponding to “snubber terminals P15 and P16”) is also conceivable.

  In this case, the auxiliary snubber circuit 22 is selected for one of the two snubber terminal pairs (snubber terminals P13 and P14 and snubber terminals P15 and P16) for the auxiliary snubber circuit 22 according to the user's request. The effect which can be provided automatically is produced.

  Further, like the power modules 8 and 9 of the eighth and ninth embodiments, the snubber terminals P13 and P14 are disposed above the edge adjacent to the first edge where the input terminals P11 and P12 are provided above. When provided, it can be provided at any position as long as it is above the adjacent edge.

  1-11 Power module, 30 Substrate, 31, 32 Conductor bar, 41-46 Semiconductor chip, 51-53 Circuit part, 61, 62 Internal wiring, P11, P12 Input terminal, P13, P14 Snubber terminal, P21-P23 Output terminal Q11, Q12, Q21, Q22, Q31, Q32 IGBT.

Claims (11)

A rectangular substrate;
A first input terminal and a second input terminal which are provided above a first edge which is one side of the substrate in a plan view and to which the first and second electrodes of the DC power supply are electrically connected;
A plurality of AC output terminals provided above a second edge, which is the other side of the substrate adjacent to the first edge, in plan view;
A plurality of circuit portions provided on the substrate, provided in parallel between the first input terminal and the second input terminal, and outputting an AC output signal from the plurality of output terminals; Each of the plurality of circuit units has at least one semiconductor chip,
In plan view, both are provided above other edges other than the first edge, and at least above a third edge adjacent to one of the first and second edges. One or more auxiliary terminals provided on one side and electrically connected to the first and second input terminals;
It is possible to provide a snubber circuit between the first and second input terminals,
An auxiliary snubber circuit can be provided between the first and second auxiliary terminals,
The cross-sectional area of the first and second auxiliary terminals in plan view is narrower than the cross-sectional area of the first and second input terminals in plan view,
Power module. The power module according to claim 1,
The first and second input terminals have first and second mounting holes for the snubber circuit;
The first and second auxiliary terminals have first and second auxiliary mounting holes for the auxiliary snubber circuit;
The diameters of the first and second auxiliary mounting holes are 1 mm or more smaller than the diameters of the first and second mounting holes,
Power module. The power module according to claim 1,
Each of the first and second auxiliary terminals has a pin shape,
Power module. The power module according to any one of claims 1 to 3,
The auxiliary terminal formation height which is the attachment height of the auxiliary snubber circuit at the first and second auxiliary terminals is the input terminal formation height which is the attachment height of the snubber circuit at the first and second input terminals. It is characterized by being lower than
Power module. The power module according to any one of claims 1 to 3,
The auxiliary terminal formation height which is the attachment height of the auxiliary snubber circuit at the first and second auxiliary terminals is the input terminal formation height which is the attachment height of the snubber circuit at the first and second input terminals. It is characterized by being higher than
Power module. The power module according to any one of claims 1 to 5,
The distance between the first and second auxiliary terminals is shorter than the distance between the first and second input terminals,
Power module. The power module according to any one of claims 1 to 6,
The third edge portion is one side of the substrate facing the first edge portion, and the first and second auxiliary terminals are both provided above the third edge portion. ,
Power module. The power module according to any one of claims 1 to 6,
The third edge is the same edge as the second edge, and both the first and second auxiliary terminals are provided above the third edge.
Power module. The power module according to any one of claims 1 to 6,
The third edge portion is one side of the substrate facing the second edge portion, and the first and second auxiliary terminals are both provided above the third edge portion. ,
Power module. The power module according to any one of claims 1 to 6,
The third edge is one side of the substrate facing the second edge, the first auxiliary terminal is provided above the third edge, and the second auxiliary terminal is It is provided above a fourth edge which is one side of the substrate facing the first edge,
Power module. The power module according to any one of claims 1 to 6,
The third edge is one side of the substrate facing the second edge, the first auxiliary terminal is provided above the third edge, and the second auxiliary terminal is Provided above the second edge,
Power module.

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