JP2007244100A - Snubber module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a snubber module that is small, that is light in weight, that makes the replacement of a snubber capacitor easy, and that is excellent in the snubber effect. <P>SOLUTION: In the snubber module structured by combining a plurality of snubber diodes connected in the bridge configuration with the snubber capacitor 3, the snubber diodes consists of a cathode-common diode portion 1, in which the cathodes of a first pair of the diodes are connected to each other, and an anode-common diode portion 2, in which the anodes of a second pair of the diodes are connected to each other. One ends of the cathode-common diode portion 1 and the anode-common diode portion 2 are connected to a first lead-out electrode member, while the other ends to the second lead-out electrode member so that both portions are connected in parallel to each other. The snubber capacitor is connected between the cathode of the cathode-common diode portion and the anode of the anode-common diode portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention protects a snubber module, particularly a bidirectional semiconductor switch made of IGBTs or FETs connected in parallel in opposite directions, or a matrix converter made by connecting a plurality of bidirectional semiconductor switches, from surge voltage. It is related with the snubber module suitable for.

  In an inverter circuit or the like, DC power is converted into AC power by connecting semiconductor switches such as IGBTs or FETs to a predetermined circuit configuration such as a bridge and controlling the pulse width of these semiconductor switches. When such a semiconductor switch is switched, particularly when the semiconductor switch is turned off, in order to continuously flow the energy stored in the inductance of the smoothing choke coil of the filter or the inductance component included in the circuit, Since a transiently large voltage is generated at both ends, a snubber circuit that suppresses the generation of a transiently large voltage by bypassing the energy from the semiconductor switch is often provided in parallel with the semiconductor switch. In a DC-AC converter such as an inverter circuit, only a one-way current flows through a semiconductor switch. Therefore, a snubber circuit is a capacitor, or a circuit combining a capacitor and a resistor, or a capacitor, a resistor and a capacitor. Various snubber circuits have been proposed.

However, in a bidirectional converter such as a bidirectional semiconductor switch or a matrix converter, a capacitor is connected in parallel to the bidirectional semiconductor switch because current flows in both directions, or between each phase of the bidirectional converter. In many cases, a snubber circuit is formed by connecting a capacitor. Under such circumstances, as an effective snubber circuit of the matrix converter, a diode circuit formed by bridge-connecting a plurality of snubber diodes is connected to the input terminal side of the matrix converter, and a plurality of snubber diodes are connected to the output terminal side. There is proposed a snubber circuit in which another diode circuit that is bridge-connected is connected and a snubber capacitor is connected between the output terminals of the diode circuit (see, for example, Patent Documents 1 and 2).
JP 2003-333826 A JP 2004-096974 A

  In the snubber module disclosed in the above-mentioned Patent Document 1, since it is composed of discrete diode parts, it is difficult to reduce the size, and the wiring connecting the diode parts becomes long. It is known that the inductance is increased and the effect of suppressing the surge voltage is reduced. The snubber module disclosed in the above-mentioned Patent Document 2 can eliminate the drawbacks of the above-mentioned Patent Document 1, but a plurality of diode elements, capacitors, and wirings connecting them are all molded with an electrically insulating resin. The heat generated by the diode element is transmitted to the capacitor via the electrical insulating resin, causing the temperature of the capacitor to rise. This means that a diode element and a capacitor having a larger capacity must be used, leading to an increase in the size of the snubber module, leading to an increase in the amount of use of the electrically insulating resin and an increase in weight. It also contributes to an increase in cost.

  Therefore, the present invention proposes a snubber module that solves the above-mentioned problems and is small and light and in which a snubber capacitor can be easily replaced.

  According to a first aspect of the present invention, there is provided a snubber module in which a plurality of snubber diodes connected to both ends of a bidirectional semiconductor switch that opens and closes a bidirectional current and a snubber capacitor are combined. A cathode common diode portion in which the cathodes of a pair of diodes are connected to each other, and an anode common diode portion in which the anodes of a second pair of diodes are connected to each other. The cathodes of the pair of diodes are connected to one main surface of the first metal base member serving as a cathode common terminal, and each anode terminal is provided at a position facing the first metal base member. The anode common diode section includes respective anodes of the second pair of diodes. The cathode common diode portion is connected to one main surface of the second metal base member serving as an anode common terminal, and has a cathode terminal at a position facing the second metal base member. The one anode terminal of the anode and one cathode terminal of the anode common diode part are connected by a first lead electrode member connected to one end of the bidirectional semiconductor switch, and the other of the cathode common diode part The cathode common diode section is connected to the other cathode terminal of the anode common diode section by a second lead electrode member connected to the other end of the bidirectional semiconductor switch. And the anode common diode section are connected in parallel, and the snubber capacitor Each of the terminals is directly or indirectly connected to the other main surface of the first metal base member and the other main surface of the second metal base member. Provides a module.

  According to a second aspect of the present invention, there is provided the snubber module according to the first aspect, wherein the other main surfaces of the first metal base member and the second metal base member are on the same plane. It is to provide.

  According to a third aspect of the present invention, there is provided a snubber module including a plurality of snubber diodes connected to both ends of a bidirectional semiconductor switch that opens and closes a bidirectional current and a snubber capacitor. From the first, second, and third cathode common diode portions where the cathodes of the diodes are connected, and the first, second, and third anode common diode portions where the anodes of the pair of diodes are connected The first, second, and third cathode common diode sections each have a metal base member that becomes a cathode common terminal, and two anode terminals at positions facing the respective metal base members. The first, second, and third anode common diode sections respectively include a metal base member that serves as an anode common terminal, Two cathode terminals at positions facing the metal base member, the first cathode common diode portion, the first anode common diode portion, the second cathode common diode portion, and the second anode The common diode part, the third cathode common diode part, and the third anode common diode part are connected in parallel to each other, and one anode terminal and one cathode terminal are connected to the other anode terminal. The other cathode terminal is a first lead electrode member and a second lead electrode member, a third lead electrode member and a fourth lead electrode member, a fifth lead electrode member and a sixth lead electrode member, respectively. The metal base members of the first, second, and third cathode common diode portions are connected to each other. The metal base members of the first, second, and third anode common diode portions are electrically and mechanically coupled to the second wide conductor. And the snubber capacitor is electrically and mechanically coupled to the first wide conductor and the second wide conductor to provide a snubber module. .

  In a fourth aspect based on the third aspect, the first, third, and fifth lead electrode members and the second, fourth, and sixth lead electrode members are respectively a three-phase AC power source and a three-phase AC power source. Three input terminals that are common to three sets of the three bidirectional switches among the nine bidirectional switches connected to the phase AC load, or three output terminals in each set The snubber module is characterized in that it is connected to one of three output terminals of each of the three sets.

  In a fifth aspect based on the third aspect or the fourth aspect, the first, second, and third cathode common diode portions, and the first, second, and third anode common diode portions are: The present invention provides a snubber module characterized in that the metal base member and the anode terminal or the cathode terminal are respectively molded with an electrically insulating material so as to be exposed.

  According to a sixth invention, in any one of the third invention to the fifth invention, the first, second and third cathode common diode sections, the first, second and third anode common diodes. The part provides a snubber module that is integrally molded with an electrically insulating material so that the metal base member and the anode terminal or the cathode terminal are exposed.

  According to the first invention or the second invention, since the snubber diode is sandwiched and bonded between the metal base member and the extraction electrode member, the wiring inductance can be minimized, and the snubber diode The heat dissipation can be made extremely good. Therefore, at the time of turning off the bidirectional semiconductor switch in any direction, not only can the surge voltage generated at both ends of the bidirectional semiconductor switch be surely limited, but also a small and economical snubber module is provided. be able to.

  Further, according to the third to sixth inventions, the current can be opened and closed in any direction of the matrix converter with a snubber module having a simple and economical structure using a member having a smaller inductance for carrying the wiring. Sometimes, it is possible to reliably limit the surge voltage generated at both ends thereof. In addition, the first and second wide conductors can not only improve the heat dissipation of the cathode common diode part and the cathode common diode part, but can also serve as a terminal for connecting a snubber capacitor and its discharge circuit. This is useful for reducing inductance and simplifying the structure of the snubber module.

[Embodiment 1]
FIG. 1 is a diagram showing a basic circuit configuration of a snubber module according to Embodiment 1 of the present invention. FIG. 2 is a drawing for explaining the structure of the snubber module according to the first embodiment. In FIG. 1, a snubber module 100 is connected to both ends of a bidirectional semiconductor switch Q. The bidirectional semiconductor switch Q is a general one, and includes, for example, two IGBTs (Insulated Gate Bipolar Transistors) Q1 and Q2 connected in parallel. The snubber module 100 includes a cathode common diode portion 1 in which cathodes of two diodes D1 and D2 are connected to each other, and an anode common diode portion in which anodes of two diodes D3 and D4 are connected to each other. 2, a snubber capacitor 3 connected between the cathode part and the anode part connected to each other, and a resistor 4 connected in parallel to the snubber capacitor 3.

  The operation of this snubber circuit will be briefly described. Now, when one semiconductor switch Q2 is in an off state and the other semiconductor switch Q1 is in an on state and the semiconductor switch Q1 changes from on to off, the current that has been flowing through the semiconductor switch Q1 until then is the diode of the snubber module 100. By flowing through D1, the snubber capacitor 3, and the diode D4, the surge voltage appearing at both ends of the semiconductor switch Q1 is suppressed. The electric charge charged in the snubber capacitor 3 is discharged through the resistor 4 and consumed. When the semiconductor switch Q1 is off, the semiconductor switch Q2 is on, and the semiconductor switch Q2 is off, the current flowing through the semiconductor switch Q2 passes through the diode D2, the snubber capacitor 3, and the diode D3 of the snubber module 100. By flowing, the surge voltage appearing at both ends of the semiconductor switch Q2 is suppressed.

  Next, the structure of the snubber module 100 that operates in this way will be described with reference to FIG. 2A is an explanatory view of the snubber module 100 as viewed from below, and FIG. 2B is an explanatory view of the snubber module 100 as viewed from the side, and the portion indicated by a chain line is also a solid line for easy understanding. There is a part shown in. The cathode common diode portion 1 and the anode common diode portion 2 have the same external shape and dimensions. The cathode common diode portion 1 is formed by molding a flat metal base member 1A and diodes D1 and D2 (FIG. 1) in which a cathode electrode (not shown) is bonded to one main surface of the metal base member 1A by soldering or the like. And an anode terminal 1C of the diode D1, and an anode terminal 1D of the diode D2. Here, the diode D1 is sandwiched between the metal base member 1A and the anode terminal 1C, and the diode D2 is sandwiched between the metal base member 1A and the anode terminal 1D. The same applies to the anode common diode section 2. A flat metal base member 2A and diodes D3 and D4 (FIG. 1) in which an anode electrode (not shown) is bonded to one main surface of the metal base member 2A by soldering or the like. It has a molded electrically insulating material 2B, a cathode terminal 2C of a diode D3, and a cathode terminal 2D of a diode D4. The diode D3 is sandwiched between the metal base member 2A and the cathode terminal 2C, and the diode D4 is sandwiched between the metal base member 2A and the cathode terminal 2D. Therefore, according to this structure, the heat radiation of the diodes D1 to D4 is good. Here, the other main surface opposite to one main surface of the metal base member 1A to which the cathodes of the diodes D1 and D2 are bonded, and one of the metal base members 1A to which the anodes of the diodes D3 and D4 are bonded. The other main surfaces opposite to the main surface are located at substantially the same level, that is, on the same plane.

  The cathode common diode portion 1 and the anode common diode portion 2 are configured such that the anode terminals 1C and 1D, the cathode terminals 2C and 2D are located in the resin case 5, and at least the metal base members 1A and 2A are from the resin case 5. It is stored so that it protrudes. The resin case 5 is opened when viewed from below in FIG. 2 (B). When viewed from above, the resin case 5 surrounds the diode D1 and the diode D2, and the diode D3 and the diode D3. Have an opening (not shown) for accommodating each of the electrical insulating materials 2B. A first extraction electrode member 6 and a second extraction electrode member 7 extend inward and outward from a pair of opposing side walls 5A and 5B of the resin case 5. The first and second lead electrode members 6 and 7 extend in directions opposite to the mounting portions 6A and 7A for mounting on the external terminals for mounting (not shown) of the bidirectional semiconductor element Q shown in FIG. It consists of connection parts 6B and 7B. In addition, about the connection part 7B of the 2nd extraction electrode member 7, the part in the resin case 5 is shown with the chain line so that it may be easy to understand. In addition, what is necessary is just to use the resin case 5 as needed, and is not necessarily required.

  The attachment portions 6A and 7A have long holes 6a and 7a, respectively, and bolts (not shown) are inserted into the long holes 6a and 7a to be attached to external terminals (not shown) at both ends of the bidirectional semiconductor switch Q. Each of the connecting portions 6B and 7B has two bolt holes 6b1 and 6b2 and bolt holes 7b1 and 7b2. Bolt holes 6b1 and 6b2 are aligned with screw holes (not shown) provided in the anode terminal 1C of the cathode common diode part 1 and the cathode terminal 2C of the anode common diode part 2, and bolts (not shown) are inserted into the holes. The first lead electrode member 6 is fixed to and electrically connected to the anode terminal 1C and the cathode terminal 2C by being inserted into and screwed. Similarly, bolt holes 7b1 and 7b2 are aligned with screw holes (not shown) provided in the cathode terminal 2D of the anode common diode part 2 and the anode terminal 1D of the cathode common diode part 1, respectively. By inserting and screwing the bolt, the second lead electrode member 7 is fixed to and electrically connected to the anode terminal 1D and the cathode terminal 2D.

  The step of attaching the first and second lead electrode members 6 and 7 to the cathode common diode portion 1 and the anode common diode portion 2 with the bolts (not shown) is performed from the lower side of FIG. Since it is performed from the opening, the mounting work can be easily performed. In FIG. 2A, the flat metal base members 1A and 2A protrude in the vertical direction from the electrical insulating materials 1B and 2B, and mounting holes 1a and 1b, 2a and 2b having arbitrary shapes are formed on the protruding portions. However, in Embodiment 1, it is not always necessary to protrude from the electrically insulating materials 1B and 2B, and it is not necessary to have the mounting holes 1a and 1b and the mounting holes 2a and 2b. In the first embodiment, both terminals of the snubber capacitor 3 and the resistor 4 shown in FIG. 1 are soldered to the flat metal base members 1A and 2A, respectively, or are mounted using bolts and eyelets (not shown). It is fixed to the holes 1a and 1b and the mounting holes 2a and 2b. The resistor 4 is not shown because it is located behind the snubber capacitor 3.

  Note that the snubber capacitor 3 shown in FIG. 2B is a diagram showing electrical connection, and is actually preferably attached to the cathode common portion 1 and the anode common portion 2 so as to reduce wiring inductance. . For example, the flat metal base members 1A and 2A are each provided with wide conductors that serve both as mechanical strength reinforcement and heat dissipation by means of bolts (not shown) using the mounting holes 1a and 1b and the mounting holes 2a and 2b. 8 and 9 (shown by broken lines) may be attached, and the snubber capacitor 3 and the resistor 4 may be attached to the wide conductors 8 and 9. When the snubber capacitor 3 and the wide conductors 8 and 9 are connected, in order to reduce wiring inductance, the snubber capacitor 3 is connected to both ends of the snubber capacitor 3 in the shortest distance from the wide conductors 8 and 9. It is preferable. A specific configuration will be described in Embodiment 2. By adopting such a configuration, the wiring inductance between the snubber capacitor 3 and the cathode common diode portion 1 and the anode common diode portion 2 can be reduced, so that the effect of suppressing the surge voltage can be enhanced. .

  Moreover, since the snubber capacitor 3 is arranged on the cathode common diode part 1 and the anode common diode part 1 as described above, even when a capacitor having a relatively large capacity is applied, the area occupied by the capacitor Can be ensured sufficiently, and the entire snubber module can be downsized. Moreover, even when it is necessary to change to the snubber capacitor 3 suitable for the design value, it can be easily replaced. Further, since the snubber capacitor 3, the cathode common diode part 1 and the anode common diode part 2 are not molded by an electrically insulating resin or the like, the snubber capacitor 3, the cathode common diode part 1 and the anode common diode part 2 The layer of air in between can insulate the heat generation of the diode. Therefore, the temperature rise of the snubber capacitor 3 can be prevented, the capacitor can be prevented from being damaged, and the life can be extended.

  Moreover, you may inject | pour into an electrically insulating resin in the resin case 5 as needed. The resin case 5 of the first embodiment is such that the snubber capacitor 3 and the resistor 4 are located outside the resin case 5 and only the lower portions of the cathode common diode portion 1 and the anode common diode portion 2 are accommodated. Since the height is low, even if the resin case 5 is injected into the electrically insulating resin, the weight is only slightly increased. Further, instead of the resistor 4, a semiconductor switch element (not shown) that turns on and discharges the charge of the snubber capacitor 3 while both of the semiconductor switches Q 1 and Q 2 are off is connected in parallel to both ends of the snubber capacitor 3. You may connect to.

[Embodiment 2]
Next, the snubber module 200 which is Embodiment 2 of this invention is demonstrated with FIG.3 and FIG.4. FIG. 3 shows a circuit configuration of the snubber module 200, and FIG. 4 is a diagram for explaining the structure of the snubber module 200. 3 and 4, the same symbols as those used in FIGS. 1 and 2 indicate members having the same names. The snubber module 200 is suitable for use as a snubber module of the matrix converter described in the above-mentioned Patent Document 2, and particularly as a snubber for a semiconductor switch module for a matrix converter shown in FIG. Is suitable. The semiconductor switch module is shown in FIG. 5 for reference, but will not be described in detail because it is described in the above-mentioned Patent Document 2. Note that FIG. 4A is a view as seen from below in FIG.

  The snubber module 200 basically has a configuration in which three snubber modules 100 of the first embodiment are connected in parallel. The snubber module 200 includes cathode common diode portions 11 to 13 having the same configuration as the cathode common diode portion 1 and anode common diode portions 21 to 23 having the same structure as the anode common diode portion 2. The cathode common diode portions 11 to 13 and the anode common diode portions 21 to 23 have the same outer shape and dimensions. As shown in FIG. 3, the cathode common diode portion 11 and the anode common diode portion 21 are connected in parallel between first and second lead electrode members 61 and 71 similar to the lead electrode members 6 and 7. Yes. The cathode common diode portion 12 and the anode common diode portion 22 are connected in parallel between third and fourth lead electrode members 62 and 72 similar to the lead electrode members 61 and 71, and the cathode common diode portion 13 and The anode common diode portion 23 is connected in parallel between fifth and sixth lead electrode members 63 and 73 similar to the lead electrode members 61 and 71. As shown in FIG. 4, the cathode common diode portions 11 to 13 are arranged in a vertical row in the resin case 5, and the anode common diode portions 21 to 23 are also arranged in a vertical row in the resin case 5. There is an interval between the cathode common diode portions 11 to 13 and the anode common diode portions 21 to 23 that can ensure electrical insulation. Although the terminals 8 'and 9' are not necessarily required, the snubber capacitor 3 is connected across the terminals 8 'and 9', and if necessary, the charging charge of the snubber capacitor 3 is appropriately discharged. A discharge circuit (not shown) for performing the operation at high speed with timing is connected. Similarly to the first embodiment, when discharging the charge of the snubber capacitor 3 with a resistor, the terminals 8 'and 9' are unnecessary, and the resistor may be incorporated in advance.

  Similar to the cathode common diode portion 1 and the anode common diode portion 2 described in the first embodiment, the cathode common diode portion 11 includes a metal base member 11A, and the metal base 11A includes mounting holes 11a and 11b. The anode common diode portion 21 includes a metal base member 21A, and the metal base 21A has mounting holes 21a and 21b. Similarly, the cathode common diode portions 12 and 13 include a metal base 12A and a metal base 13A, respectively, and the anode common diode portions 22 and 23 similarly include a metal base 22A and a metal base 23A, respectively. Since the drawings are complicated and difficult to see, symbols other than the metal base members 11A and 21A are not attached to the mounting holes, but these metal base members are also the same as the metal base member 11A and the metal base member 21A. A simple mounting hole is provided as shown. The mounting hole 11b of the metal base 11A and the mounting hole 21b of the metal base 21A are notched mounting holes in order to increase the degree of freedom of the bolt positions. The mounting holes 11a and 21a may be similar mounting holes. The same applies to the metal bases 12A and 13A and the metal bases 22A and 23A.

  The metal base members 11A, 12A, and 13A of the cathode common diode portions 11 to 13 have a reduced size and the positions of the metal base 12A and the mounting holes for the metal base 13A with respect to the mounting holes 11a and 11b for the metal base 11A are constant. It is preferable that they are in contact with each other from the viewpoint of becoming, but it is not always necessary to be in contact. The same applies to the metal base members 21A, 22A, and 23A of the anode common diode portions 21 to 23. Note that at least the metal base members 11A to 13A of the cathode common diode portions 11 to 13 and the metal base members 21A to 23A of the anode common diode portions 21 to 23 are outside the resin case 5, that is, the resin case 5 in FIG. Located on the upper outside. In the second embodiment, the resin case 5 may be used as necessary.

  The bolt holes 61b1 and 61b2 of the first lead electrode member 61 are aligned with screw holes (not shown) provided in the anode terminal 11C of the cathode common diode part 11 and the cathode terminal 21C of the anode common diode part 21, respectively. After that, the first lead electrode member 61 is fixed by inserting the bolts 81 and 82 into the holes and screwing them, and the anode terminal 11C and the cathode terminal 21C are electrically connected. Similarly, bolt holes 71b1 and 71b2 of the second lead electrode member 71 are formed in screw holes (not shown) provided in the anode terminal 11D of the cathode common diode part 11 and the cathode terminal 21D of the anode common diode part 21, respectively. After alignment, the bolts 83 and 84 are inserted and screwed to fix the second lead electrode member 71, and the anode terminal 11D and the cathode terminal 21D are electrically connected. Since the cathode common diode portion 12 and the anode common diode portion 22 and the cathode common diode portion 13 and the anode common diode portion 23 are exactly the same, the description thereof is omitted. Further, since the drawing becomes complicated and difficult to see, symbols are not shown for the anode terminals and cathode terminals of the cathode common diode section 12 and the anode common diode section 22, and the cathode common diode section 13 and the anode common diode section 23. . In this way, the cathode common diode portions 11 to 13 and the anode common diode portions 21 to 23 correspond to the lead electrode members 61 to 63 and 71 to 73 extending from the side wall of the resin case 5, that is, the cathode common diode. The part 11 and the anode common diode part 21 are connected to the lead electrode members 61 and 71, the cathode common diode part 12 and the anode common diode part 22 are the lead electrode members 62 and 72, the cathode common diode part 13 and the anode common diode part 23. Are mechanically coupled and electrically connected to the extraction electrode members 63 and 73.

  Next, the first wide conductor 8 whose cross section is bent in an L shape is fixed to the metal base members 11A to 13A. When the metal base members 11A to 13A are arranged as shown in FIG. 4A, the L-shaped wide conductor 8 has a length substantially equal to the distance between both ends of the metal base members 11A to 13A. The width of the members 11A to 13A, that is, the width in the left-right direction of the metal base member 11A in FIG. In the second embodiment, as shown in FIG. 4A, the metal base members 11A to 13A of the cathode common diode portions 11 to 13 are in contact with each other, and the sizes of the metal base members 11A to 13A are substantially equal. The spacing between the mounting holes of the metal base member 12A and the metal base member 13A with respect to the mounting holes 11a and 11b of the metal base member 11A is a predetermined value, and penetrates the flat portion 8A of the wide conductor 8 at that spacing. A hole is provided. Therefore, if the wide conductor 8 is placed on the metal base members 11A to 13A so that these through holes coincide with the mounting holes 11a and 11b of the metal base member 11A, the other through holes also form the metal base members 12A and 13A. It matches the mounting hole. In this state, the wide conductor 8 can be firmly fixed to the metal base members 11A to 13A by screwing the bolts into the mounting holes of the metal base members 11A to 13A through the through holes. For example, in FIG. 4B, the bolt 91 is screwed into the mounting hole 11a of the metal base member 11A through the through hole, and is not shown in the mounting hole 11b of the metal base member 11A through the other through hole. Screw the bolts. Note that illustration of the nut screwed to the bolt is omitted.

  Similar to the first wide conductor 8, the second wide conductor 9 whose section is bent in an L shape is fixed to the metal base members 21A to 23A. When the metal base members 21A to 23A are arranged as shown in FIG. 4A, the L-shaped wide conductor 9 has a length substantially equal to the distance between both ends of the metal base members 21A to 23A. The width of the members 21A to 23A, that is, the width in the left-right direction of the metal base member 21A in FIG. As shown in FIG. 4A, since the metal base members 21A to 23A of the cathode common diode portions 21 to 23 are in contact with each other, the metal base member 22A with respect to the mounting holes 21a and 21b of the metal base member 11A, the metal The interval between the mounting holes of the base member 23A is a predetermined value, and the flat portion 9A of the wide conductor 9 is provided with through holes at that interval. Therefore, the wide conductor 9 can be fixed to the metal base members 11 </ b> A to 13 </ b> A by using the bolt 92 or the like as in the case of the wide conductor 8. It is not necessary to limit the width of the wide conductors 8 and 9 in particular.

  As can be seen from the above, the wide conductor 8 electrically functions as the cathode common line KL in FIG. 3, and the wide conductor 9 electrically functions as the anode common line AL in FIG. The raised portions 8B and 9B of the first and second wide conductors 8 and 9 function as terminals 8'9 'in FIG. Therefore, the snubber capacitor 3 is connected to the standing portions 8B and 9B of the wide conductors 8 and 9. The connection may be soldered or fixed with bolts and nuts using normal eyelets. In addition, since the height of the snubber capacitor 3 is increased when a single snubber capacitor 3 is used, each of the snubber capacitors is reduced in size. For example, the three small capacitors are arranged in parallel to form the wide conductor 8. , 9 can be connected to the upright portions 8B, 9B to reduce the height of the snubber module 200. Since the standing portions 8B and 9B of the wide conductors 8 and 9 also serve as the terminals 8'9 'in FIG. 3, it is a matter of course that the structure may be such that the terminals of the discharge circuit not shown are easily connected.

  Note that the interval between the standing portions 8B and 9B of the wide conductors 8 and 9 may be changed according to the size of the snubber capacitor 3. With such a configuration, the wiring inductance can be reduced. Further, the snubber capacitor 3 may be mounted in a space formed between the cathode common diode portion 1 and the anode common diode portion 2. With this configuration, the entire snubber module 200 can be reduced in size. The snubber module 100 can have the same configuration.

  The snubber module 200 as described above is simply fixed to the six terminals T1, T2, T3, T4, T5, and T6 of the semiconductor switch module SM shown in FIG. For example, the extraction electrode member 61 is extracted to the terminal T1, the extraction electrode member 62 is extracted to the terminal T2, the extraction electrode member 63 is extracted to the terminal T3, the extraction electrode member 71 is extracted to the terminal T4, and the extraction electrode member 72 is extracted to the terminal T5. The electrode members 73 are fixed to and electrically connected to the terminals T6, respectively. GT is a gate terminal for driving a plurality of bidirectional semiconductor switches.

FIG. 6 shows a circuit diagram in which the snubber module 200 is connected to the semiconductor switch module SM. In this embodiment, the terminals T1, T2, and T3 of the semiconductor switch module SM are connected to the R, S, and T phases of the three-phase AC power source, respectively, and the terminals T4, T5, and T6 are respectively connected to the three-phase AC load. Connected to U, V, and W phases. Q _{11 to} Q ₁₉ are each a bidirectional semiconductor switch in which two IGBTs are connected in parallel, and has the same configuration as the bidirectional semiconductor switch Q described in the first embodiment. Nine bidirectional semiconductor switches Q _{11 to} Q ₁₉ are changed to three sets of bidirectional semiconductor switches Q _{11 to} Q ₁₃ , Q _{14 to} Q ₁₆ , and Q _{17 to} Q ₁₉ constituted by three bidirectional semiconductor switches. The three input terminals of each group are connected to the R, S, and T phases, respectively, and one output terminal that combines the three output terminals is connected to the U, V, and W phases. Note that the circuit operations of the snubber module 200 and the semiconductor switch module SM are the same as those in the prior art, and a description thereof is omitted.

  Although two diodes are used in each of the cathode common diode portion and the anode common diode portion of the snubber modules of Embodiments 1 and 2 described above, it is of course possible to use an even number of diodes such as four or six. Further, the structures of the anode terminals, for example, the anode terminals 1C and 1D and the cathode terminals, for example, the cathode terminals 2C and 2D, are not particularly limited, and may be fixed to the lead electrode member by soldering. Further, the metal base members 1A and 2A, 11A to 13A, and 21A to 23A of the cathode common diode portion and the anode common diode portion of the snubber module may be fixed to the corresponding lead electrode members by resistance welding. In particular, spot welding is a method of performing resistance welding by discharging energy stored in a capacitor (not shown) in a short time (for example, about 10 to 20 ms) and causing a pulsed current to flow between the metal base member and the extraction electrode member. According to the method, since the heat generated during welding is hardly diffused, the diode element is not adversely affected, which is preferable. Of course, they can be fixed and connected to each other by soldering or the like. In the case of such welding or soldering, the mounting holes for each metal base member, for example, the mounting holes 11a and 11b of the metal base member 11A are unnecessary.

  The wide conductors 8 and 9 basically have a structure in which the cross section is bent in an L shape. However, the thermal expansion or contraction of the wide conductors 8 and 9 is a condition such as the material and thickness of the wide conductors 8 and 9. In the case where the cathode common diode portion and the anode common diode portion are adversely affected by the above, the raised portions 8B of the wide conductors 8 and 9 are not disturbed to fix the metal base member and the wide conductors 8 and 9, respectively. A necessary number of minute slits extending from 9B in the width direction of the upright portions 8A and 9A may be provided. By doing in this way, the stress given to the said metal base member from the wide conductors 8 and 9 can be relieved. Also, in the snubber module 200 of the second embodiment, the fixing portion between the anode terminal and the cathode terminal located in the resin case 5 and the corresponding extraction electrode member may be molded with an electrically insulating resin such as an epoxy resin.

It is a figure which shows the circuit structure of the snubber module 100 which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the snubber module 100 which concerns on Embodiment 1 of this invention. It is a figure which shows the circuit structure of the snubber module 200 which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the snubber module 200 which concerns on Embodiment 2 of this invention. It is a figure which shows an example of the semiconductor switch module to which the snubber module of this invention is connected. It is a figure which shows the circuit diagram structure which connected the snubber module 200 of Embodiment 2 which concerns on this invention to semiconductor switch module SM.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cathode common diode part 1A ... Metal base member 1B ... Electrical insulation material 1C, 1D ... Anode terminal 2 ... Anode common diode part 2A ... Metal base member 2B ... Electricity Insulating material 2C, 2D ... Cathode terminal 3 ... Capacitor for snubber 4 ... Resistor 5 ... Resin case 6, 7 ... Lead electrode member 6A, 7A ... Mounting portion 6B, 7B ..Connecting portions 6a, 7a ... long holes 8 ', 9' ... terminals 8, 9 ... first and second wide conductors 10 ... inverter circuits or switch circuits 11-13 ... Cathode common diode part 11A-13A ... Metal base member 11C, 11D ... Anode terminal 11a, 11b of cathode common diode part 11 ... Removal of cathode common diode part 11 Holes 21-23 ... Anode common diode part 21A-23A ... Metal base member 21C, 21D ... Cathode terminals 21a, 21b ... Anode common diode part 21 for mounting the anode common diode part 21 Holes 61 to 63... Extraction electrode members 61 b 1 and 61 b 2... Bolt holes for extraction electrode member 61 71 to 73... Extraction electrode members 71 b 1 and 71 b 2. ... Bolts 91, 92 ... Bolts 100, 200 ... Snubber module Q ... Bidirectional semiconductor switch D1-D4 ... Diode SM ... Semiconductor switch module GT ... Gate terminal T1- T6 ··· terminal Q ₁₁ ~Q ₁₉ ··· bidirectional semiconductor switch

Claims (6)

In a snubber module that combines a plurality of snubber diodes connected to both ends of a bidirectional semiconductor switch that opens and closes a bidirectional current and a snubber capacitor,
The snubber diode comprises a cathode common diode portion in which the cathodes of the first pair of diodes are connected to each other, and an anode common diode portion in which the anodes of the second pair of diodes are connected to each other.
The cathode common diode portion is connected to one main surface of the first metal base member where each cathode of the first pair of diodes serves as a cathode common terminal, and is opposed to the first metal base member. Have each anode terminal in a position to
The anode common diode portion is connected to one main surface of a second metal base member, in which each anode of the second pair of diodes serves as an anode common terminal, and is opposed to the second metal base member. Each cathode terminal in a position to
The one anode terminal of the cathode common diode portion and the one cathode terminal of the anode common diode portion are connected by a first lead electrode member connected to one end of the bidirectional semiconductor switch, and the cathode The other anode terminal of the common diode portion and the other cathode terminal of the anode common diode portion are connected by a second lead electrode member connected to the other end of the bidirectional semiconductor switch, The cathode common diode part and the anode common diode part are connected in parallel,
Both terminals of the snubber capacitor are directly or indirectly connected to the other main surface of the first metal base member and the other main surface of the second metal base member, respectively. Snubber module featuring. In claim 1,
The snubber module, wherein the other main surface of the first metal base member and the second metal base member is on the same plane. In a snubber module that combines a plurality of snubber diodes connected to both ends of a bidirectional semiconductor switch that opens and closes a bidirectional current and a snubber capacitor,
The snubber diode includes a first, second, and third cathode common diode portion in which the cathodes of a pair of diodes are connected to each other, and a first, second, and second in which the anodes of the pair of diodes are connected to each other. 3 anode common diode sections,
The first, second, and third cathode common diode portions each have a metal base member that becomes a cathode common terminal, and two anode terminals at positions facing the respective metal base members,
The first, second, and third anode common diode sections each have a metal base member that serves as an anode common terminal, and two cathode terminals at positions facing each metal base member,
The first cathode common diode portion and the first anode common diode portion, the second cathode common diode portion and the second anode common diode portion, the third cathode common diode portion and the third anode Each of the anode terminals and the cathode terminals, the other anode terminal and the other cathode terminal are respectively connected to the first lead electrode member and the second so that the common diode portions are connected in parallel. A lead electrode member, a third lead electrode member and a fourth lead electrode member, a fifth lead electrode member and a sixth lead electrode member,
The respective metal base members of the first, second, and third cathode common diode portions are electrically and mechanically coupled to the first wide conductor,
The respective metal base members of the first, second, and third anode common diode portions are electrically and mechanically coupled to the second wide conductor,
The snubber capacitor is characterized in that the snubber capacitor is electrically and mechanically coupled to the first wide conductor and the second wide conductor. In claim 3,
The first, third, and fifth lead electrode members and the second, fourth, and sixth lead electrode members are respectively connected between a three-phase AC power source and a three-phase AC load. Either of the three input terminals common to the three sets of the three bidirectional switches in the bidirectional switch, or the three output terminals of the three sets obtained by combining the three output terminals in each set. Snubber module characterized in that it is connected to the crab. In claim 3 or claim 4,
The first, second, and third cathode common diode sections and the first, second, and third anode common diode sections are electrically connected so that their metal base members and anode terminals or cathode terminals are exposed. A snubber module characterized by being molded with an insulating material. In any one of Claim 3 thru | or 5,
The first, second, and third cathode common diode portions and the first, second, and third anode common diode portions are electrically connected so that their metal base members and anode terminals or cathode terminals are exposed. A snubber module characterized by being molded integrally with an insulating material.

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