JP2008301643A - Power conversion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase capacity of a power conversion device without enlarging dimensions of the device. <P>SOLUTION: This device has the first conductor pole having a plate-shaped part in which a positive pole terminal or a negative pole terminal of a capacitor is connected and which is disposed roughly in parallel to a flat surface on which each terminal is disposed so as to cover the capacitors group and a part which is connected on DC side of the first power conversion circuit and located in a vertical posture to the flat surface, and the second conductor pole having a plate-shaped part in the same way, a part which is connected with the vertical part of the first conductor pole and is located in a vertical posture to the flat surface and a part which is connected on the DC side of the second power converting circuit and is located in a vertical posture to the flat surface. This structure increases freedom of a position of the connecting terminal and reduces wiring length between the first/second power converting circuits and a smoothing capacitor, thus reducing imbalance of current flowing in each capacitor, and increasing capacity without enlarging the power conversion device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power conversion device including a circuit in which a plurality of capacitors are connected in parallel.

  Power conversion devices using high-speed semiconductor switching elements such as insulated gate bipolar transistors (IGBTs) are used in various fields. In recent years, large-capacity semiconductor modules have been realized due to advances in semiconductor technology, and a large capacity may be achieved by connecting a plurality of semiconductor modules in parallel.

  When a semiconductor module is connected in parallel to increase the capacity in a power converter, the smoothing capacitor that handles the DC power supply of the inverter also increases the charge / discharge current, so multiple capacitors are connected in parallel and, depending on the voltage, connected in series Often done. When capacitors are connected in parallel, if the current sharing of each capacitor is not equalized, the use condition or the life is determined by the capacitor with heavy duty, so it is necessary to balance the current flowing through each capacitor.

  The main factors contributing to current equalization in parallel connection are differences in capacitor characteristics and differences in wiring inductance. Of these, for differences in capacitor characteristics, measures such as selecting the characteristics to be uniform among parallel elements are often taken, but differences in wiring inductance are considered at the stage of structural design.

  FIG. 1 and FIG. 3 of Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-245480) show a structure in which capacitors are connected in parallel / two series in a plate-like conductor. As shown in FIG. 10 of the patent document, when the size of the semiconductor module portion above the capacitor is substantially the same as the size of the capacitor portion, the entire device is not extremely enlarged. However, when the capacity of the semiconductor module is increased and the capacity of the capacitor is increased with the same dimension, the dimension in the direction in which the capacitors are arranged in parallel is extremely large. . For this reason, the wiring length to the semiconductor switching element becomes long, and current non-uniformity occurs between the capacitors. Since it is necessary to increase the rated current or the rated voltage of the capacitor in consideration of such current non-uniformity, the capacitor becomes larger and the apparatus becomes larger.

JP 2001-245480 A

  The problem to be solved by the present invention is to suppress current non-uniformity when capacitors are connected in parallel in the power converter, and to increase the capacity of the power converter without increasing the size of the apparatus.

  In order to solve the above-described problem, a plate-like portion that is connected to a positive electrode terminal or a negative electrode terminal of a capacitor and is arranged substantially parallel to a plane on which each terminal is arranged so as to cover the capacitor group; A first conductor electrode (712, 722, 714, 724, 731, 741) having a portion connected to the DC side of the power conversion circuit and perpendicular to the plane, and a similar plate-like portion; A second portion connected to a vertical portion of the first conductor electrode and perpendicular to the plane, and a portion connected to the DC side of the second power conversion circuit and perpendicular to the plane. Conductor electrodes (713, 723, 715, 725, 732, 742).

  According to the above solution, since the first and second power conversion circuits are connected to the capacitor by the conductor having a plate-like portion, the wiring inductance can be reduced. Furthermore, the degree of freedom of the position of the connection terminal is large, and it becomes easy to reduce the wiring length between the first and second power conversion circuits and the smoothing capacitor. As a result, the unevenness of the current flowing through each capacitor can be alleviated, so that the capacity can be increased without enlarging the power converter.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 3 shows a main circuit configuration of a power converter in which the present invention is implemented. As shown in FIG. 3, a forward conversion circuit (converter circuit) configured from a three-phase AC power source 5 to boost reactors 61 to 63 and IGBT / RP to TN which are self-extinguishing switching elements and converts AC power into DC power, Arbitrary AC power is supplied to the motor 4 through an inverse conversion circuit (inverter circuit) that is configured by the smoothing capacitor 1 and IGBTs UP to WN and converts DC power to AC power. In addition, each switching element and smoothing capacitor in FIG. 3 are comprised from what was respectively connected in parallel or in series parallel according to the power capacity of a power converter device.

  FIG. 4 shows a configuration for one phase composed of one phase of the forward conversion circuit, one phase of the reverse conversion circuit, and a part of the smoothing capacitor connected to these DC sides.

  The smoothing capacitor 1 is composed of a capacitor group consisting of 12 capacitors in total, 6 parallel / 2 series of 6 parallel connected positive side capacitors 111 to 116 and 6 parallel connected negative side capacitors 121 to 126. Yes. Connected to the smoothing capacitor 1 are positive-side switching elements RP1 and RP2 and negative-side switching elements RN1 and RN2 that constitute one phase of the forward conversion circuit. Similarly, positive side switching elements UP1 and UP2 and negative side switching elements UN1 and UN2 constituting one phase of the inverse conversion circuit are connected.

  Here, the case where two positive electrodes and two negative electrodes are arranged in parallel is assumed as the switching element, but the number of parallel elements may be set in accordance with the converter capacity. A module in which the positive electrode side and the negative electrode side are integrated may be used.

  FIG. 5 shows an arrangement example of the switching elements RP1 to RN2, UP1 to UN2, and the capacitors 111 to 126. 5A is a side view, FIG. 5B is a front view, and FIG. 5C is a view taken along the line AA ′. As for the switching element, UP1-UN2 is attached to the surface of the heat radiator 31, and RP1-RN2 is attached to the back surface. Here, the radiator 31 is forcibly cooled by a fan 32 using a heat pipe system. The capacitors are arranged in three rows horizontally and four steps in the depth direction. Each capacitor has a positive electrode terminal and a negative electrode terminal, and these terminals are arranged on substantially the same plane. The radiator 31 is arranged such that the front surface and back surface thereof, that is, the mounting surface of the semiconductor switching element is substantially perpendicular to the plane on which each terminal of the capacitor is arranged. Thereby, the magnitude | size of the whole power converter device can be reduced.

  FIG. 1 shows the structure of a conductor that connects capacitors in series and parallel in the power conversion device according to the first embodiment of the present invention.

  In FIG. 1, seven plate-like conductors are laminated in four layers. Here, the insulating plates sandwiched between the conductor plates are not shown. Also, only the frontmost four capacitors (113, 116, 123, 126) are shown (see FIG. 5C).

  FIG. 2 shows a schematic structure viewed from the conductor cross-sectional direction. Since both FIG. 1 and FIG. 2 are for explaining the embodiment of the invention, the dimensions are different from the actual ones.

  The positive terminals 1131 and 1161 of the positive capacitors 113 and 116 are connected to the positive terminals 7113 and 7116 of the first positive conductor 711 (as shown by imaginary lines in FIG. 1). Here, in order to ensure insulation from the capacitor intermediate conductor 70 laminated on the capacitor side with respect to the first positive electrode conductor 711, the capacitor intermediate conductor 70 is provided with a circular punching hole. After passing through these holes, the positive terminals 1131 and 1161 of the positive capacitors 113 and 116 are connected to the positive terminals 7113 and 7116 of the positive conductor 711, respectively.

  Further, the positive terminals 1111, 1121, 1131 of the positive capacitors 111, 112, 113 arranged on the outside are connected to the plate-like portion of the second positive conductor 712 through positive terminals 7121, 7122, 7123.

  Although the detailed structure of the conductor terminals (7113, 7123, etc.) is not shown in the figure, a configuration in which a pipe-shaped object is sandwiched or a part of the conductor is pulled out and bent is applicable. In addition, the terminal for capacitor | condenser connection in each conductor is provided in the plate-shaped part of each conductor. These plate-like portions are arranged so as to cover the capacitor group and substantially parallel to a plane on which the positive electrode terminal and the negative electrode terminal of each capacitor are arranged. By having such a plate-like portion, the inductance of the conductor is reduced. And the position of the terminal for capacitor | condenser connection provided in the plate-shaped part of a conductor is just right above the terminal of a capacitor | condenser, and both are connected by the shortest distance. Thereby, the wiring length between both terminals is shortened and inductance is reduced.

  The negative terminals 1132 and 1162 of the positive capacitor are connected to terminals 7013 and 7016 of the capacitor intermediate conductor 70, and the positive terminals 1231 and 1261 of the negative capacitors 123 and 126 are connected to terminals 7023 and 7026 of the capacitor intermediate conductor 70.

  The negative terminals 1232 and 1262 of the negative capacitors 123 and 126 are connected to the negative terminals 7213 and 7216 of the first negative conductor 721 (as shown by imaginary lines in FIG. 1). Here, in order to ensure insulation from the capacitor intermediate conductor 70 laminated on the capacitor side with respect to the first negative electrode conductor 721, the capacitor intermediate conductor 70 is provided with a circular punching hole. After passing through these holes, the negative terminals 1232 and 1262 of the negative capacitors 123 and 126 are connected to the negative terminals 7213 and 7216 of the negative conductor 721, respectively.

  Further, the negative terminals 1242, 1252, and 1262 of the negative capacitors 124, 125, and 126 arranged on the outside are connected to the plate-like portion of the second negative conductor 722 through negative terminals 7224, 7225, and 7226, respectively.

  The second positive electrode conductor 712 is provided with connection terminals 712a, 712b, and 712c for connection to a conductor (inverter positive electrode conductor) connected to the positive electrode of the inverter not shown here. These connection terminals are formed by a portion bent substantially perpendicularly from the plate-like portion of the second positive electrode conductor. That is, these connection terminals are portions that are substantially perpendicular to the plane in which the positive and negative terminals of each capacitor are arranged in the second positive conductor. Such a connection terminal can shorten the wiring between the semiconductor switching element and the smoothing capacitor in FIG.

  Similarly, a conductor (converter positive conductor) connected to the positive electrode of the converter not shown here is connected to the connection terminals 713d, 713e, and 713f of the third positive electrode conductor 713. The connection terminals 713a, 713b, and 713c of the third positive electrode conductor 713 are connected to the connection terminals 712a, 712b, and 712c of the second positive electrode conductor, respectively. The connection terminals 713a to 713c and the connection terminals 713d to 713f of the third positive electrode conductor 713 are connected by a plate-like portion. Similar to the second positive electrode conductor 712, these connection terminals are formed by a portion bent substantially vertically from the plate-like portion. Here, as shown in FIG. 6A, the structure of the connection terminal portion connected to the inverter positive conductor is such that the bent connection terminals 712c and 713c face each other, and the inverter positive conductor connection terminal PC is also connected to the connection terminal 712c. It is the structure which is made to contact with and is screwed.

  In addition, in the connection part of Fig.6 (a), it connected in order of 713c, 712c, and Pc from the left of the figure, but another order may be sufficient. However, when taking the procedure of connecting the capacitor and the laminated conductor of the capacitor portion and then connecting to the inverter conductor, the inverter conductor connecting terminal Pc should be on the right side of the figure (outside as the device). The connection work is easy because it is only necessary to press from the outside.

  The second negative electrode conductor 722 is provided with connection terminals 722d, 722e, and 722f for connection to a conductor (converter negative electrode conductor) that is not illustrated here. These connection terminals are formed by a portion bent substantially perpendicularly from the plate-like portion of the second negative electrode conductor. That is, these connection terminals are portions that are substantially perpendicular to the plane on which the positive and negative electrode terminals of each capacitor are arranged in the second negative electrode conductor. Such a connection terminal can shorten the wiring between the semiconductor switching element and the smoothing capacitor in FIG.

  A conductor (inverter negative conductor) connected to the negative electrode of the inverter (not shown) is connected to the connection terminals 723a, 723b, and 723c of the third negative electrode conductor 723. The connection terminals 723d, 723e, and 723f of the third negative electrode conductor 723 are connected to the connection terminals 722d, 722e, and 722f of the second negative electrode conductor, respectively. The connection terminals 723a to 723c and the connection terminals 723d to 723f of the third negative electrode conductor 723 are connected by a plate-like portion. Similar to the second negative electrode conductor 722, these connection terminals are formed by a portion bent substantially vertically from the plate-like portion. As shown in FIG. 6B, the structure of this connection terminal portion is such that the connection terminal Nf of the converter negative electrode conductor is connected from the left side when the connection terminals 722f and 723f are directly opposed.

  The connection between the inverter negative electrode conductor and the third negative electrode conductor 723 is such that the connection terminal Nc of the inverter negative electrode conductor contacts the right side of the connection terminal 723c of the third negative electrode conductor 723 in FIG.

  The connection between the converter positive electrode conductor and the third positive electrode conductor 713 is such that the connection terminal Pf of the converter positive electrode conductor contacts the left side of the connection terminal 713f of the third positive electrode conductor 713 in FIG.

  As described above, by including the second positive conductor to which the inverter positive conductor and the positive terminal of the capacitor are connected, and the third positive conductor that is connected to the second positive conductor and connected to the converter positive conductor. And a second negative electrode conductor to which the converter negative electrode conductor and the negative electrode terminal of the capacitor are connected, and a third negative electrode conductor connected to the second negative electrode conductor and connected to the inverter negative electrode conductor. Both converters can be connected to a smoothing capacitor with a conductor having a relatively wide plate-like portion, and wiring inductance can be reduced. Furthermore, the degree of freedom of the position of the connection terminal is increased, and the wiring length between the inverter and converter and the smoothing capacitor can be reduced. As a result, the unbalance of the current flowing through each capacitor can be reduced.

  In this embodiment, an electrolytic capacitor is used as the capacitor (see FIG. 4), but a film capacitor or the like may be used.

  Further, two capacitors may be connected in series, and a voltage dividing resistor may be connected in order to suppress uneven voltage sharing due to individual differences between capacitors. If there is no problem of ensuring insulation, the capacitor terminal may be connected directly, and if not, it may be connected to a terminal provided by pulling out a part of the conductor plate and bending it.

  The capacitor conductor shown in FIG. 1 is for one phase, and the entire power conversion device is configured by arranging the capacitor conductors for three phases. At that time, the positive electrode and the negative electrode are electrically connected to each other for three phases.

  The interphase connection terminal 712d of the second positive electrode conductor is connected to the adjacent phase 712e, the interphase connection terminal 713g of the third positive electrode conductor is connected to the adjacent phase 713h, and 713i is connected to the adjacent phase 713j.

  Similarly, on the negative electrode side, the interphase connection terminal 722g of the second negative electrode conductor and the adjacent phase 722h are connected, the interphase connection terminal 723g of the third negative electrode conductor and the adjacent phase 723h are connected, 723i and the adjacent phase 723j, Connect.

  Connection between these interphase connection terminals (not shown) is performed by a plate-like conductor, but when the interval is wide, the inductance is reduced by ensuring that the positive electrode side and the negative electrode side are laminated with insulation. Can do.

  The operation of this embodiment will be described with reference to FIGS. 7 and 8 show a schematic current direction in the conductor cross-sectional view of FIG.

  FIG. 7 shows a PN circuit during switching on the converter (RP, RN in FIG. 2) side, that is, discharge from the positive capacitor positive electrode and current flows to the converter positive conductor connection terminal (only Pf is shown). A schematic current path in a circuit in which current returns from a terminal (only Nf is shown) to the negative capacitor negative electrode is shown.

  Current paths from positive terminals 1111 to 1161 (only 1113 and 1161 are shown) of positive side capacitors 111 to 116 (only 113 and 116 are shown) to converter positive conductor connection terminals Pd to Pf (only Pf is shown) are outside. For the capacitors 111 to 113 (only 113 shown), the positive terminals 1111 to 1131 (only 1131 shown) to the positive terminals 7111 to 7113 (only 7113 shown) of the first positive conductor and the positive terminals 7121 to 7123 of the second positive conductor are shown. A current flows into the second positive conductor 712 via (only 7123 is shown).

  In addition, the first positive electrode conductor from the positive terminals 1141 to 1161 (only 1161 shown) of the capacitors 114 to 116 (only 116 shown) inside through the positive terminals 7114 to 7116 (only 7116 shown) of the first positive electrode conductor. 711, and then a current flows to the second positive conductor 712 via the positive terminals 7121-7123 (only 7123 shown) of the second positive conductor.

  At this time, the current paths from the inner capacitors 114 to 116 are longer than the current paths from the outer capacitors 111 to 113, but the reverse currents are opposed to each other in the oval box in FIG. Is reduced. Therefore, the inductance unevenness of the outer and inner current paths is suppressed, and the current sharing unevenness of the outer capacitor and the inner capacitor is reduced.

  From the second positive electrode conductor 712, current flows through the third positive electrode conductor 713 from the connection terminals 712a to 713a, 712b to 713b, and 712c to 713c (only 712c and 713c are shown). A current flows through the connection terminals Pd, Pe, Pf (only Pf is shown) of the converter positive electrode conductor via the connection terminals 713d, 713e, 713f (only 713f is shown).

  Current from the connection terminals Nd, Ne, Nf (only Nf shown) of the converter negative electrode conductor is supplied to the second negative electrode conductor 722 via the connection terminals 722d, 722e, 722f (only 722f shown) of the second negative electrode conductor 722. And flows to the first negative electrode conductor 721 via the negative terminals 7224 to 7226 (only 7226 is shown).

  Further, a part of this current flows from the first negative conductor 721 to the negative terminals 1212, 1222, and 1232 (1232 only) of the negative capacitors 121 to 123 (123 only) through the negative terminals 7211 to 7213 (only 7213 illustrated). Flow). The remaining current flows to the negative terminals 1242, 1252, and 1262 (only 1262 shown) of the negative capacitors 124 to 126 on the outside via the negative terminals 7214 to 7216 (only 7216 shown) of the second negative conductor. Even in this case, the non-uniform current sharing is reduced because the oval-enclosed portion in the figure forms a reverse current facing portion.

  The positive terminals of the negative capacitors 121 to 126 and the negative terminals of the positive capacitors 111 to 116 are connected by an intermediate conductor 70.

  FIG. 8 shows a PN circuit during switching on the inverter (UP, UN in FIG. 2) side, that is, discharge from the positive electrode of the positive capacitor and current flows to the inverter positive conductor connection terminal (only Pc is shown). It shows a schematic current path in a circuit in which current returns from a connection terminal (only Nc is shown) to the negative capacitor negative electrode. The current path is indicated by an arrow in the figure and is the same as in FIG.

  A second embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 10, the capacitors are 6 parallel / 2 series to form the smoothing capacitor portion of the three-phase power converter.

  FIG. 9 shows the structure of the capacitor conductor. Here, the insulating plate sandwiched between the conductor plates is not shown. Note that the configuration of each conductor, such as a plate-like portion, a vertical portion, and a punch hole, is the same as that of the embodiment of FIG.

  In FIG. 9, capacitors are arranged in four rows horizontally and in three rows in the depth direction, with positive capacitors 111 to 116 arranged in the right two columns and negative capacitors 121 to 126 arranged in the two left columns. In FIG. 9, only the negative capacitor 126, the negative capacitor 123, the positive capacitor 116, and the positive capacitor 113 on the foremost side are shown.

  In FIG. 9, the positive terminals (only 1131 shown) of the positive capacitors 111 to 113 in the rightmost column are connected to the positive terminals 7141 to 7143 of the first positive conductor 714, and the positive terminals of the remaining positive capacitors 114 to 116. (Only 1161 is shown) is connected to the positive terminal (7151-7153) of the second positive conductor 715.

  The negative terminals (only 1132 and 1162 are shown) of the positive capacitors 111 to 116 are connected to the terminals 7011 to 7016 of the capacitor intermediate conductor 70, and the positive terminals (1231 and 1261 are only shown) of the negative capacitors 121 to 126 are connected to the capacitor intermediate conductor. 70 terminals 7021 to 7026 are connected.

  In FIG. 9, the negative terminals (only 1262 shown) of the negative capacitors 124 to 126 in the leftmost column are connected to the negative terminals 7241 to 7243 of the first negative conductor 724, and the negative terminals of the remaining negative capacitors 121 to 123. (Only 1232 is shown) is connected to the negative terminal (7251-7253) of the second negative conductor 725.

  Connection of the first positive electrode conductor 714 to the positive terminals (Pu to Pw not shown) of the inverter, and connection of the second positive electrode conductor 715 to the positive electrodes (Pu to Pw not shown) of the inverter Terminals 715u to 715w are connected to the positive electrode of the inverter.

  The second positive electrode conductor 715 is connected to the positive electrode of the converter through connection terminals 715r to 715t to the positive electrode (Pr to Pt not shown) of the converter.

  Connection terminals 724r to 724t of the first negative electrode conductor 724 to the negative electrode (Nr to Nt, not shown) of the converter, and connection of the second negative electrode conductor 725 to the negative electrode (Nr to Nt, not shown) of the converter. Terminals 725r to 725t are connected to the negative electrode of the converter.

  The second negative electrode conductor 725 is connected to the negative electrode of the inverter through connection terminals 725r to 725t to the negative electrode (Nu to Nw not shown) of the inverter.

  The structure of the connection terminal is the same as that in FIG.

  FIG. 11 shows a PN circuit during switching on the converter (RP, RN in FIG. 2) side, that is, discharge from the positive terminal of the positive capacitor and current flows to the converter positive conductor connection terminal (only Pt is shown), A schematic current path in a circuit in which a current returns from a conductor connection terminal (only Nt is shown) to the negative capacitor negative electrode is shown.

  Current paths from positive terminals 1111 to 1161 (only 1113 and 1161 only) of positive side capacitors 111 to 116 (only 113 and 116 are shown) to converter positive electrode conductor connection terminals Pr to Pt (only Pt is shown) are outside. Regarding the capacitors 111 to 113 (only 113 shown), the positive terminals 1111 to 1131 (only 1131 shown) to the positive terminals 7141 to 7143 (only 7143 shown) of the first positive conductor 714, the first positive conductor 714 and the second positive electrode conductor 714 are shown. A current flows into the second positive electrode conductor 715 via the connection terminals 714 u to 714 w and 715 u to 715 w of the positive electrode conductor 715.

  Further, the second positive electrode is connected to the second positive electrode conductors 715 through the positive terminals 7151 to 7153 (only 7153 is shown) from the positive terminals 1141 to 1161 (only 1161 is shown) of the capacitors 114 to 116 (only 116 is shown) inside. A current flows through the conductor 715.

  At this time, the current path from the outer capacitors 111 to 113 is longer than the current path from the inner capacitors 114 to 116, but in the opposite direction to the current flowing through the intermediate conductor 70 that connects the positive and negative capacitors. Since the currents are opposed to each other, non-uniform inductance in the current path is suppressed, and non-uniform current sharing is also reduced.

  From the second positive electrode conductor 715, current flows to the connection terminals Pr, Ps, Pt (only Pt shown) of the converter positive electrode conductor via the connection terminals 715r, 715s, 715t (only 715t shown).

  A part of the current from the connection terminals Nr, Ns, Nt (only Nt is shown) of the converter negative electrode conductor is connected to the first negative electrode via the connection terminals 724r, 724s, 724t (only 724t is shown) of the first negative electrode conductor 724. It flows to the conductor 724 and flows to the negative terminals 1242, 1252, and 1262 (only 1262 shown) of the negative side capacitors 124 to 126 located outside via the negative terminals 7241 to 7243 (only 7243 shown).

  The remaining current flows to the second negative electrode conductor 725 via the connection terminals 725r, 725s, and 725t (only 725t shown) of the second negative electrode conductor 725, and inward via the negative electrode terminals 7251 to 7253 (only 7253 shown). It flows to the negative terminals 1212, 1222, and 1232 (only 1232 are shown) of certain negative capacitors 121 to 123.

  At this time, both the first negative electrode conductor 724 and the second negative electrode conductor 725 are connected to the connection terminal (Nt in the drawing) of the converter negative electrode conductor, and the inner capacitor (123 in the drawing) and the outer capacitor (123 in the drawing). 126), the lengths of the current paths flowing through the capacitor 126 are substantially equal, so that the non-uniformity of the capacitor current sharing is reduced.

  FIG. 12 shows a PN circuit during switching on the inverter (UP, UN in FIG. 2) side, that is, discharge from the positive capacitor positive electrode, current flows to the inverter positive conductor connection terminal (only Pw is shown), and inverter negative conductor connection A schematic current path in a circuit in which current returns from the terminal (only Nw is shown) to the negative capacitor negative electrode is shown.

  Since this case is also the same as that in FIG. 11, description on the current path is omitted, but the current to the inverter positive terminal Pw is connected to the connection terminal (714 w in the figure) of the first positive conductor 714 and the second positive conductor 715. Since both of the connection terminals (715w in the figure) are connected, the lengths of the current paths flowing from the outer capacitor (113 in the figure) and the inner capacitor (116 in the figure) are substantially equal. Non-uniformity is reduced.

  In this embodiment, since the capacitor terminals are connected to each conductor, the wiring inductance is reduced and each conductor is supported by the connection portion with the capacitor terminal, so that the assembly work of the conductor portion is easy. become.

  A third embodiment of the present invention will be described with reference to FIGS.

  In the example shown in FIG. 13, six capacitors are connected in parallel without being connected in series, and the positive electrode side is connected at six points Pa to Pf, and the negative electrode side is connected at four points Na to Nd. It is.

  FIG. 14 shows a conductor structure. However, the insulating plate is not shown. FIG. 15 shows the configuration of the conductor cross-sectional structure.

  The first positive electrode-side conductor 731 has a configuration folded at the right end of the drawing, and constitutes a portion of the counter current in the reverse direction. Further, the first negative electrode side conductor 741 has a structure folded at the left end in the figure, and similarly constitutes a portion of the counter current in the reverse direction.

  Similarly to the above-described embodiment, the second positive electrode side conductor 732 and the second negative electrode side conductor 742 are also connected to the positive electrode terminal and the negative electrode terminal of the capacitor, respectively.

  FIG. 16 shows the first positive electrode side conductor 731 and the second positive electrode side conductor 732 as viewed from above in FIGS. 14 and 15. Moreover, the arrow AA 'figure in FIG. 15 is also shown.

  The first positive electrode side conductor 731 is connected to the positive terminals 1011 to 1061 of the capacitors 101 to 106 by capacitor connecting terminals 7311 to 7316. The second positive electrode side conductor 732 is connected to the first positive electrode side conductor 731 by capacitor connection terminals 7322 and 7325.

  The first positive electrode side conductor 731 is connected to the positive electrodes Pa to Pf of the converter and the inverter by connection terminals 731a to 731f. Furthermore, the second positive electrode side conductor 732 is also connected to the positive electrodes Pa to Pf of the converter and the inverter by connection terminals 732a to 732f.

  FIG. 17 shows the first negative electrode side conductor 741 and the second negative electrode side conductor 742 as viewed from above in FIGS. 14 and 15. Moreover, the arrow BB 'figure in FIG. 15 is also shown.

  The first negative electrode side conductor 741 is connected to the negative electrode terminals 1012 to 1062 of the capacitors 101 to 106 by capacitor connection terminals 7411 to 7416. Further, the second negative electrode side conductor 742 is connected to the first negative electrode side conductor 741 by capacitor connection terminals 7422 and 7425.

  The first negative electrode side conductor 741 is connected to the negative electrodes Na to Nd of the converter and the inverter by connection terminals 741a to 741d. Further, the second negative electrode side conductor 742 is also connected to the negative electrodes Na to Nd of the converter and the inverter by connection terminals 742a to 742d.

  18 and 19 show current paths in the PN circuit of the converter and the inverter. FIG. 18 shows a current path when the current is discharged from the capacitor to the positive electrodes Pa to Pc of the inverter and returns from the negative electrodes Na and Nb of the inverter. The part enclosed by the ellipse in the figure is the part where the reverse current is opposed.

  FIG. 19 shows a path when the current is discharged from the capacitor to the positive electrodes Pd to Pf of the converter and returns from the negative electrodes Nc and Nd of the converter. Similarly, the part surrounded by an ellipse in the figure is the part where the opposite direction is opposite to the current.

  By adopting such a wiring conductor configuration, current non-uniformity between parallel-connected capacitors is suppressed, and the entire apparatus can be reduced in size.

  Although the case where the smoothing capacitor portion of the power converter is connected in parallel by a plurality of capacitors is shown here, the present invention may be applied to an electrical component having a positive electrode and a negative electrode, for example, a semiconductor module or a battery. .

The wiring structure in the 1st Embodiment of this invention is shown. The cross-sectional schematic diagram of the wiring structure in the 1st Embodiment of this invention is shown. The circuit structure of the power converter device which implemented this invention is shown. 1 shows a configuration of a circuit to which a first embodiment of the present invention is applied. The example of the mounting structure of the power converter device to which the 1st Embodiment of this invention is applied is shown. The schematic structure of the connection terminal in the 1st Example form of this invention is shown. The figure for demonstrating the current pathway in the 1st Embodiment of this invention is shown. The figure for demonstrating the current pathway in the 1st Embodiment of this invention is shown. The wiring structure in the 2nd Embodiment of this invention is shown. The structure of the circuit to which the 2nd Embodiment of this invention is applied is shown. The figure for demonstrating the current pathway in the 2nd Embodiment of this invention is shown. The figure for demonstrating the current pathway in the 2nd Embodiment of this invention is shown. The structure of the circuit to which the 3rd Embodiment of this invention is applied is shown. The wiring structure in the 3rd Embodiment of this invention is shown. The wiring structure in the 3rd Embodiment of this invention is shown. The structure of the positive electrode side conductor in the 3rd Embodiment of this invention is shown. The structure of the negative electrode side conductor in the 3rd Embodiment of this invention is shown. The figure for demonstrating the current pathway in the 3rd Embodiment of this invention is shown. The figure for demonstrating the current pathway in the 3rd Embodiment of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Smoothing capacitor 4 Motor 5 Power supply 31 Radiator 32 Fans 61-63 Reactors 101-106, 111-116, 121-126 Capacitors RP, SP, TP, UP, VP, WP, RN, SN, TN, UN, VN, WN self-extinguishing switching element (including freewheeling diode)

Claims (6)

First and second power conversion circuits;
The first and second power conversion circuits are connected to the DC side, and a plurality of capacitors each having a positive terminal and a negative terminal are connected in parallel or in series. The positive terminal and the negative terminal are substantially the same. A group of capacitors arranged in a plane;
In a power converter comprising:
A plate-like portion that is connected to one of the plurality of positive terminals and negative terminals and is arranged substantially parallel to the plane so as to cover the capacitor group, and a direct current of the first power conversion circuit A first conductor electrode having a portion connected to the side and perpendicular to the plane;
A plate-like portion disposed substantially parallel to the plane so as to cover the capacitor group; a portion connected to the perpendicular portion of the first conductor electrode and perpendicular to the plane; A second conductor electrode connected to the DC side of the two power conversion circuits and having a portion perpendicular to the plane;
A power conversion device comprising:   2. The plate-like portion according to claim 1, wherein a plurality of the one terminals are connected, and the plate-like portion is arranged substantially parallel to the plane so as to cover the capacitor group. The plate-like portion and the first conductor electrode A power conversion device comprising a third conductor electrode facing the plate-like portion so that a reciprocating current flows.   The power conversion device according to claim 1, wherein a plurality of the one terminals are connected to the second conductor electrode.   2. The first conductor electrode according to claim 1, wherein the first conductor electrode has a bent portion that follows the plate-like portion of the first electrode and another plate-like portion that follows the bent portion, and the other plate-like portion is The power conversion is arranged substantially parallel to the plane so as to cover a capacitor group, and the plate-like portion of the first electrode and the other plate-like portion face each other so that a reciprocating current flows. apparatus. First and second power conversion circuits;
The positive and negative terminals are connected to the DC side of the first and second power conversion circuits, and a plurality of capacitors each having a positive terminal and a negative terminal are connected in parallel or in series. The positive terminal and the negative terminal are substantially the same. A group of capacitors arranged in a plane;
In a power converter comprising:
A plurality of the positive terminals are connected, and are connected to a plate-like portion disposed substantially parallel to the plane so as to cover the capacitor group, to a positive pole on the DC side of the first power conversion circuit, and A first conductor electrode having a portion perpendicular to the plane;
A plate-like portion disposed substantially parallel to the plane so as to cover the capacitor group; a portion connected to the perpendicular portion of the first conductor electrode and perpendicular to the plane; A second conductor electrode connected to the positive electrode on the direct current side of the power conversion circuit 2 and having a portion perpendicular to the plane;
A plurality of the negative electrode terminals connected to each other and connected to a plate-like portion disposed substantially parallel to the plane so as to cover the capacitor group; and a negative electrode on the DC side of the second power conversion circuit; and A third conductor electrode having a portion perpendicular to the plane;
A plate-like portion disposed substantially parallel to the plane so as to cover the capacitor group; a portion connected to the perpendicular portion of the third conductor electrode and perpendicular to the plane; A fourth conductor electrode connected to the negative electrode on the DC side of one power conversion circuit and having a portion perpendicular to the plane;
A power conversion device comprising:   6. The power conversion device according to claim 1, wherein the first power conversion circuit, the second power conversion circuit, and the capacitor group are an inverter, a converter, and a smoothing capacitor, respectively. .

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