JP2016158425A - Power conversion device, and power conversion device-integrated motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device whose length in an axial direction is shorten to achieve downsizing.SOLUTION: A power conversion device 1A comprises: an input capacitor 2 that has a hollow cylindrical shape and is connected to a DC power supply 91 by using a first terminal 211 and a second terminal 212; a reactor 3 that has a hollow cylindrical shape, is disposed on the inner diameter side of the input capacitor 2, and has a third terminal 311 connected to the first terminal 211 and a fourth terminal 312 connected to an intermediate electrode 32m; a power conversion unit 4 that is disposed on the inner diameter side of the reactor 3 and includes an upper side switch unit 41 and lower side switch unit 42, the upper side switch unit 41 and lower side switch unit 42 being electrically connected to the fourth terminal 312 through the intermediate electrode 32m; and an output capacitor 5 that has a hollow cylindrical shape and includes a fifth terminal 511 connected to the upper side switch unit 41 and a sixth terminal 512 connected to the second terminal 212.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power conversion device, and a power conversion device integrated motor device in which the power conversion device and a motor are integrated.

  In recent years, a hybrid vehicle having an engine and a motor as a driving source for driving and an electric vehicle having only a motor are rapidly spreading, and various types of driving devices have been put into practical use. As the motor, a three-phase synchronous motor generator is frequently used, and when driving, the driving wheel is driven by power supplied from an in-vehicle battery, and during braking, regenerative power generation is performed to charge the battery. Here, although the vehicle speed can be controlled by variably adjusting the drive voltage supplied to the motor, the charging voltage of the battery fluctuates with time. For this reason, it is common to provide a power conversion device between the motor and the battery to perform bidirectional power conversion. The power conversion device includes a converter unit, an inverter unit, and the like. This type of power conversion device is not limited to in-vehicle use, and is widely used in distributed power generation facilities.

  For example, power converters suitable for in-vehicle use and related technologies are disclosed in Patent Documents 1 to 3. In these apparatuses and related technologies, a hollow cylindrical structure is employed to reduce the size and weight, and improve the mounting property on a vehicle. The high-voltage side and low-voltage side of the DC circuit are arranged inside and outside the coaxial line, and the AC three-phase circuit is arranged rotationally symmetrically. Further, the generation of noise is suppressed in consideration of lead length reduction and bus bar configuration. ing.

JP 2009-88466 A JP 2013-197486 A JP 2014-216455 A

  By the way, in the hollow cylindrical converter device disclosed in Patent Document 3, the input capacitor, the reactor, the power conversion unit, and the output capacitor are arranged along the axial direction, thereby realizing a reduction in size and weight. However, in consideration of improvement in mountability, it is preferable to further reduce the size, particularly to shorten the length in the axial direction.

  Therefore, the present invention has been made in view of the problems of the above-described background art, and provides a power conversion device that is reduced in size by reducing the length in the axial direction of the device as compared with the prior art, and An object to be solved is to provide a power converter integrated motor device that is miniaturized including the power converter.

  The power conversion device according to claim 1 of the present invention that solves the above-mentioned problems has a hollow cylindrical shape, is electrically connected to a DC power source via a first terminal and a second terminal, and a hollow cylinder A third terminal on the input side which is shaped on the inner diameter side of the input capacitor and is electrically connected to the first terminal; and a fourth terminal on the output side which is electrically connected to the intermediate electrode An upper switch portion that is disposed on an inner diameter side of the reactor and that performs switching control, and a lower switch portion that is electrically connected to the second terminal and performs switching control. The switch unit and the lower switch unit have a power conversion unit electrically connected to the fourth terminal via the intermediate electrode, and have a hollow cylindrical shape, and are electrically connected to the upper switch unit on the high voltage side The fifth end And and an output capacitor having a sixth terminal coupled with the second terminal and electrically low-pressure side.

  According to a seventh aspect of the present invention, there is provided a power converter integrated motor device, wherein the three-phase motor is integrally provided on the central axis of the power converter according to the fifth or sixth aspect.

  According to the power conversion device of claim 1 of the present invention, the input capacitor, the reactor, and the power conversion unit, which are arranged along the axial direction in the prior art, have a triple structure inside and outside the coaxial, and the axis of the device compared to the conventional one. The length in the direction is shortened to achieve downsizing. Therefore, for example, when the power conversion device is mounted on a vehicle, the mountability is greatly improved.

  According to the power converter integrated motor device of the seventh aspect of the present invention, it is possible to reduce the size of the motor device by integration, and the mountability to the vehicle is greatly improved.

It is a circuit diagram showing the whole power converter of a 1st embodiment, the upper part shows the circuit composition of the converter unit, and the lower part shows the circuit composition of the inverter unit. It is sectional drawing of one side with respect to the central axis explaining the structure of the power converter device of 1st Embodiment. FIG. 3 is an arrow view showing a portion corresponding to 60 ° of the central angle of the cross section of the first layer to the sixth layer shown in FIG. 2. It is sectional drawing of the one side with respect to the central axis explaining the structure of the power converter device of 2nd Embodiment. It is sectional drawing of the one side with respect to the central axis explaining the structure of the power converter device of the modification of 2nd Embodiment. It is sectional drawing of one side with respect to the central axis explaining the structure of the power converter device of 3rd Embodiment. It is a side view explaining the structure of the vicinity of the three-phase gate drive circuit of an inverter unit. It is sectional drawing which shows typically the power converter integrated motor apparatus of 4th Embodiment.

  1 A of power converter devices of 1st Embodiment of this invention are demonstrated with reference to FIGS. 1-3. FIG. 1 is a circuit diagram showing the entire power conversion device 1A of the first embodiment, in which the upper part shows the circuit configuration of the converter unit 1 and the lower part shows the circuit configuration of the inverter unit 6. The power conversion device 1A boosts the power supply voltage Vd1 of the DC power supply 91 by the converter unit 1 to generate a DC output voltage Vd2, and the inverter unit 6 converts the DC output voltage Vd2 to the AC output voltage Va to thereby convert the three-phase AC load. Output to 99.

  The converter unit 1 is composed of an input capacitor 2, a reactor 3, a power conversion unit 4, and an output capacitor 5. The first terminal 211 of the input capacitor 2 is electrically connected to the high voltage side terminal 91 </ b> P of the DC power supply 91 via the internal conductor 921. The second terminal 212 of the input capacitor 2 is electrically connected to the low voltage side terminal 91N of the DC power supply 91 via the outer conductor 922. The third terminal 311 on the input side of the reactor 3 is electrically connected to the first terminal 211 of the input capacitor 2. The fourth terminal 312 on the output side of the reactor 3 is electrically connected to the high voltage side intermediate electrode 32m.

  The power conversion unit 4 includes a circuit including an upper switch unit 41 and a lower switch unit 42. The upper switch unit 41 and the lower switch unit 42 are configured by parallel connection of switching elements 41S and 42S and diodes 41D and 42D, respectively. Examples of the switching elements 41S and 42S include, but are not limited to, regular hexagonal plate-shaped power semiconductor modules and publicly known IGBT elements disclosed in Patent Document 1 by the applicant of the present application.

  The collector terminal 41C of the high voltage side switching element 41S and the cathode terminal 41K of the diode 41D are electrically connected to the fifth terminal 511 of the output capacitor 5 via the high voltage side output electrode 43 on the high voltage side. The emitter terminal 41E of the switching element 41S and the anode terminal 41A of the diode 41D are electrically connected to the high-voltage side intermediate electrode 32m.

  On the other hand, the collector terminal 42C of the low-voltage side switching element 42S and the cathode terminal 42K of the diode 42D are electrically connected to the high-voltage side intermediate electrode 32m. The emitter terminal 42E of the switching element 42S and the anode terminal 42A of the diode 42D are electrically connected to the second terminal 212 of the input capacitor 2 and the sixth terminal 512 of the output capacitor 5 via the low-voltage common electrode 24. Connected on the side. The fifth terminal 511 and the sixth terminal 512 of the output capacitor 5 are electrically connected to the inverter unit 6.

  The inverter unit 6 has a circuit configuration including three-phase upper switch parts 61U, 61V, 61W and lower switch parts 62U, 62V, 62W. Each phase upper side switch part 61U, 61V, 61W and each phase lower side switch part 62U, 62V, 62W are comprised by the parallel connection of switching element 61S, 62S and diode 61D, 62D, respectively. Examples of the switching elements 61S and 62S include, but are not limited to, regular hexagonal plate-shaped power semiconductor modules and publicly known IGBT elements disclosed in Patent Document 1 by the present applicant.

  As shown in FIG. 1, since the circuit configuration of the inverter unit 6 is the same in the U phase, the V phase, and the W phase, the U phase is taken as an example, and the description of the V phase and the W phase is omitted. To do. The collector terminal 61C of the switching element 61S of the U-phase upper switch unit 61U and the cathode terminal 61K of the diode 61D are electrically connected to the fifth terminal 511 of the output capacitor 5 of the converter unit 1. Further, the emitter terminal 61E of the switching element 61S of the U-phase upper switch unit 61U and the anode terminal 61A of the diode 61D are electrically connected to the U-phase inverter output electrode 63U.

  On the other hand, the collector terminal 62C of the switching element 62S of the U-phase lower switch unit 62U and the cathode terminal 62K of the diode 62D are electrically connected to the U-phase inverter output electrode 63U. The emitter terminal 62E of the switching element 62S and the anode terminal 62A of the diode 62D of the U-phase lower switch unit 62U are electrically connected to the sixth terminal 512 of the output capacitor 5. Each phase inverter output electrode 63U, 63V, 63W is electrically connected to a three-phase AC load 99.

  Next, the structure of the power conversion device 1A of the first embodiment will be described. FIG. 2 is a cross-sectional view on one side with respect to the central axis CL for explaining the structure of the power conversion device 1A of the first embodiment. The power conversion device 1A is formed to be rotationally symmetric around the central axis CL, and FIG. 2 shows a cross section on one side of the power conversion device 1A. FIG. 3 is a view taken in the direction of the arrow showing the central angle corresponding to 60 ° of the cross section of the first to sixth layers shown in FIG. Each of the input capacitor 2, the reactor 3, and the output capacitor 5 constituting the power conversion device 1A has a hollow cylindrical shape.

  A reactor 3 is disposed on the inner diameter side of the input capacitor 2. A power conversion unit 4 is disposed on the inner diameter side of the reactor 3. That is, the input capacitor 2, the reactor 3, and the power conversion unit 4 have a coaxial inner / outer triple structure around the central axis CL. The arrangement order of the triple structure can be changed in addition to the above, for example, the reactor 3, the input capacitor 2, and the power conversion unit 4 may be arranged from the coaxial outer side to the inner side. The output capacitor 5 and the inverter unit 6 are arranged in a coaxial inner / outer duplex structure side by side in the axial direction of the coaxial inner / outer triple structure (aligned on the lower side in FIG. 2). The output capacitor 5 is arranged side by side in the axial direction of the input capacitor 2 and the reactor 3. The inverter unit 6 is arranged side by side in the axial direction of the power conversion unit 4.

  The input capacitor 2 and the output capacitor 5 can be, for example, hollow cylinder capacitors disclosed in Patent Document 2 by the applicant of the present application. That is, the input capacitor 2 and the output capacitor 5 include an inner peripheral cylindrical portion, a one-pole connecting portion having one side surface portion extending from one end portion of the inner peripheral cylindrical portion to the outer peripheral side, an inner peripheral cylindrical portion and a center. The other electrode connecting portion having an outer peripheral cylindrical portion coaxially arranged on the axis and the other side surface portion extending from the other end of the outer peripheral cylindrical portion to the inner peripheral side, and one electrode connected to the one electrode connecting portion Plate, the other electrode plate facing the one electrode plate and connected to the other electrode connecting portion, and the electrostatic capacitance portion having a dielectric interposed between the one electrode plate and the other electrode plate, It can be set as the hollow cylindrical capacitor | condenser by which the electrostatic capacitance part is accommodated in the annular space formed between a cylinder part, one side part, an outer peripheral cylinder part, and another side part.

  As shown in FIG. 2, the input capacitor 2 and the output capacitor 5 have a hollow cylindrical shape and have the same outer diameter. The input capacitor 2 and the output capacitor 5 share the outer peripheral electrode 23 and the low-voltage side common electrode 24. The outer peripheral electrode 23 has a cylindrical shape and is disposed on the outer periphery of the main body of the input capacitor 2 and the output capacitor 5. The low-voltage side common electrode 24 has an annular shape, and is connected to a substantially intermediate position in the axial direction of the inner surface of the outer peripheral electrode 23. The low-voltage side common electrode 24 is disposed between the input capacitor 2 and the output capacitor 5 and extends radially inward from the output capacitor 5.

  For connection between the DC power supply 91 and the converter unit 1, a cylindrical inner conductor 921 and a cylindrical outer conductor 922 arranged on the coaxial outer side of the inner conductor 921 are used. The outer conductor 922 may or may not be grounded to the frame ground. When not grounding, it is preferable to arrange a cylindrical frame ground around the outer conductor 922. The inner conductor 921 and the outer conductor 922 have flange-shaped electrodes 931 and 932 whose ends on the side close to the converter unit 1 respectively extend radially outward. The outer edge of the flange-shaped electrode 932 of the outer conductor 922 is electrically connected to the outer peripheral electrode 23.

  A first terminal 211 is formed on the surface of the main body of the input capacitor 2 away from the output capacitor 5 (upper surface in FIG. 2). The first terminal 211 is connected in contact with the flange-shaped electrode 931 of the internal conductor 921. Further, the first terminal 211 is bent toward the inner peripheral side of the hollow cylindrical shape, and has a connection surface 25 on the inner periphery. A second terminal 212 is formed on the surface of the main body of the input capacitor 2 that faces the output capacitor 5 (the lower surface in FIG. 2). The second terminal 212 is disposed in contact with the low-voltage side common electrode 24 and is electrically connected to the external conductor 922 via the outer peripheral electrode 23 and the flange-shaped electrode 932.

  The reactor 3 can be, for example, a hollow cylindrical reactor device disclosed in Patent Document 3 by the applicant of the present application. That is, the reactor 3 is a reactor device that includes an inductance element having a coil 35 wound with a conductor covered with an insulation coating around the central axis CL on the forward path, and a return conductor on the return path. The axis CL can be a hollow cylindrical or annular shape, and the return conductor can be a hollow cylindrical reactor device that has a cylindrical shape with the central axis CL in common and is arranged on the coaxial outer peripheral side of the inductance element. Here, the outer peripheral electrode 23 plays the role of the return conductor. In the first embodiment, the coil 35 is formed in a toroidal shape around the central axis CL, and a core 36 having a gap is disposed outside the coil 35.

  The third terminal 311 of the reactor 3 is provided on the outer peripheral surface of the hollow cylindrical body. The third terminal 311 is disposed so as to face the connection surface 25 of the first terminal 211 of the input capacitor 2 on the inside and outside of the same axis and contact each other, and is directly electrically connected without using a lead wire. The fourth terminal 312 of the reactor 3 is provided on the inner peripheral surface of the main body. An annular high-voltage intermediate electrode 32m is disposed inside the fourth terminal 312. The high-voltage intermediate electrode 32m has a connection surface 33 on the outer periphery. The fourth terminal 312 and the connection surface 33 of the high-voltage side intermediate electrode 32m are arranged opposite to each other on the inside and outside of the coaxial axis, contact each other, and are directly electrically connected.

  The power conversion unit 4 can be, for example, a hollow cylindrical power conversion unit used in the hollow cylindrical converter device disclosed in Patent Document 3 by the applicant of the present application. The power converter 4 is disposed along the axial direction of the central axis CL together with the electrodes to be connected. That is, in order from the upper side to the lower side shown in FIG. 2, the high-voltage side output electrode 43, the upper switch unit 41, the high-voltage side intermediate electrode 32 m, the lower-side switch unit 42, the channel material 44, and the low-voltage side common electrode 24 Has been placed. The high voltage side output electrode 43 is bent in the axial direction on the inner peripheral side and extends to the inside of the inverter unit 6.

  Here, the switching elements 41S and 42S of the upper switch unit 41 and the lower switch unit 42 are plate-shaped, and collector terminals 41C and 42C are formed on the front surface, and gate terminals 41G and 42G and an emitter terminal 41E on the back surface. 42E is formed. The collector terminal 41C of the high voltage side switching element 41S is directly electrically connected to the high voltage side output electrode 43 using soldering. The emitter terminal 41E of the switching element 41S is also electrically connected directly to the high-voltage side intermediate electrode 32m using soldering. The solder material used for soldering is preferably a high melting point type, but is not limited to this (the same applies to other soldering locations described below). The high-voltage side diode 41D omitted in FIG. 2 is disposed and electrically connected between the high-voltage side output electrode 43 and the high-voltage side intermediate electrode 32m.

  On the other hand, the collector terminal 42C of the low-voltage side switching element 42S is directly electrically connected to the high-voltage side intermediate electrode 32m using soldering. The emitter terminal 42E of the switching element 42S is electrically connected to the low-voltage side common electrode 24 using a channel material 44 having a U-shaped cross section. The low-voltage side diode 42 </ b> D omitted in FIG. 2 is disposed and electrically connected between the high-voltage side intermediate electrode 32 m and the low-voltage side common electrode 24.

  A sixth terminal 512 is formed on the surface of the main body of the output capacitor 5 facing the input capacitor 2 (upper surface in FIG. 2). The sixth terminal 512 is disposed in contact with the low-voltage side common electrode 24 and is electrically connected to the power conversion unit 4 and the inverter unit 6 via the low-voltage side common electrode 24. That is, the low voltage side common electrode 24 also serves as the low voltage side inverter input electrode. A fifth terminal 511 is formed on the surface of the main body of the output capacitor 5 away from the input capacitor 2 (lower in FIG. 2). The fifth terminal 511 is in contact with and electrically connected to the high-voltage side inverter input electrode 53.

  The high-voltage side inverter input electrode 53 has an annular shape and extends to the inside in the radial direction from the output capacitor 5. The inverter unit 6 is electrically connected to the inner periphery of the high-voltage side inverter input electrode 53. The inner edge of the high-voltage side inverter input electrode 53 is electrically connected to the end portion extending in the axial direction of the high-voltage side output electrode 43 of the power conversion unit 4.

  In the converter unit 1 described above, a gate control signal is input from a gate drive circuit (not shown) to the gate terminals 41G and 42G of the switching elements 41S and 42S on the high voltage side and the low voltage side. Thus, converter unit 1 boosts power supply voltage Vd1 of DC power supply 91 to generate DC output voltage Vd2 and outputs it to inverter unit 6. Note that even the configuration of only the converter unit 1 that does not include the inverter unit 6 can be used as a power converter that can adjust the DC output voltage Vd2.

  Furthermore, the power conversion unit 4 and the inverter unit 6 are disposed with a low-voltage common electrode 24 interposed therebetween. For example, the inverter unit 6 may be an inverter device disclosed in Patent Document 1 or Patent Document 2 by the applicant of the present application. That is, the inverter unit 6 has six equilateral triangular power semiconductor modules (switching elements) arranged in a regular hexagonal shape, and these are arranged in three-phase upper switch portions 61U, 61V, 61W and lower switch portions 62U, 62V, 62W. It can be set as the inverter apparatus of the structure used for each. The switching elements 61S of the upper-side switch units 61U, 61V, 61W are arranged rotationally symmetrically at a 120 ° pitch around the central axis CL. Similarly, the switching elements 62S of the lower phase switch units 62U, 62V, and 62W are also disposed rotationally symmetrically at a 120 ° pitch around the central axis CL.

  The inverter unit 6 is arranged along the axial direction of the central axis CL together with the electrodes to be connected. That is, in order from the upper side to the lower side shown in FIG. 2, the low-voltage side common electrode 24 corresponding to the low-voltage side inverter input electrode, the channel material 64, the respective phase lower side switch parts 62U, 62V, 62W, and the inverter output electrode 63U. 63V, 63W, each phase upper side switch part 61U, 61V, 61W, and the high voltage side inverter input electrode 53 are arranged.

  Here, each phase upper side switch unit 61U, 61V, 61W and each phase lower side switch unit 62U, 62V, 62W switching elements 61S, 62S are plate-shaped, collector terminals 61C, 62C are formed on the surface, Gate terminals 61G and 62G and emitter terminals 61E and 62E are formed on the back surface. And the collector terminal 61C of the switching element 61S of each phase upper side switch part 61U, 61V, 61W is electrically connected to the high voltage side inverter input electrode 53 directly using soldering. Further, the emitter terminal 61E of the switching element 61S is also electrically connected directly to each phase inverter output electrode 63U, 63V, 63W using soldering. The diode 61D of each phase upper side switch unit 61U, 61V, 61W omitted in FIG. 2 is disposed between and electrically connected to the high voltage side inverter input electrode 53 and each phase inverter output electrode 63U, 63V, 63W. ing.

  On the other hand, the collector terminal 62C of the switching element 62S of each phase lower side switch part 62U, 62V, 62W is electrically connected to each phase inverter output electrode 63U, 63V, 63W directly using soldering. The emitter terminal 62E of the switching element 62S is electrically connected to the low-voltage side common electrode 24 using a channel material 64 having a U-shaped cross section. The diode 62D of each phase lower side switch unit 62U, 62V, 62W omitted in FIG. 2 is arranged between each phase inverter output electrode 63U, 63V, 63W and the low voltage side common electrode 24 and is electrically connected. Has been.

  The three-phase inverter output electrodes 63U, 63V, 63W are arranged rotationally symmetrically at a 120 ° pitch around the central axis CL. Each phase inverter output electrode 63U, 63V, 63W is bent between the output capacitor 5 and the inverter unit 6, drawn out in the axial direction (downward in FIG. 2), and electrically connected to the three-phase AC load 99. .

  In the first layer of FIG. 3, an inner conductor 921 and a flange-like electrode 932 of the outer conductor 922 are shown. In the second layer, a flange-like electrode 931 of the inner conductor 921 is shown. In the third layer, a coaxial inner / outer triple structure of the input capacitor 2, the reactor 3, and the power conversion unit 4 (upper switch unit 41) is shown. In the fourth layer, the low-voltage side common electrode 24 is shown. The fifth layer shows a coaxial inner / outer double structure of the output capacitor 5 and the inverter unit 6. In the sixth layer, the fifth terminal 511 of the output capacitor 5 and the switching elements 61S of the upper phase switch parts 61U, 61V, 61W of the inverter unit 6 are shown.

  A gate control signal is input to the gate terminals 61G and 62G of the switching elements 61S and 62S of the inverter unit 6 from a three-phase gate drive circuit (not shown). Thereby, the inverter unit 6 converts the DC output voltage Vd2 into the AC output voltage Va and outputs it to the three-phase AC load 99.

  The power converter 1A of the first embodiment can generate a desired DC output voltage Vd2 by the variable boost function of the converter unit 1 even if the DC power supply 91 is a battery and the power supply voltage Vd1 changes. Further, the inverter unit 6 can output an AC output voltage Va having a desired frequency and effective value to the three-phase AC load 99. Furthermore, the power conversion device 1A has a power conversion function in the reverse direction. That is, the power conversion device 1A can charge the battery corresponding to the DC power supply 91 by converting the three-phase AC power input from the motor generator corresponding to the three-phase AC load 99 to DC.

  The converter unit 1 that constitutes the power conversion device 1A of the first embodiment has a hollow cylindrical shape, and is an input capacitor 2 that is electrically connected to the DC power supply 51 via the first terminal 211 and the second terminal 212. And has a hollow cylindrical shape, is disposed on the inner diameter side of the input capacitor 2, and is electrically connected to the third terminal 311 on the input side, which is electrically connected to the first terminal 211, and the intermediate electrode 32m. Reactor 3 having a fourth terminal 312 on the output side, an upper switch portion 41 that is disposed on the inner diameter side of reactor 3 and that performs switching control, and a lower side that is electrically connected to second terminal 212 and performs switching control A power conversion unit 4 that is electrically connected to the fourth terminal 312 via the intermediate electrode 32m, and a hollow cylindrical type. And an output capacitor 5 having a fifth terminal 511 electrically connected to the upper switch portion 41 on the high voltage side and a sixth terminal 512 electrically connected to the second terminal 212 on the low voltage side. Prepare.

  According to this, the input capacitor 2, the reactor 3, and the power conversion unit 4 that are arranged along the axial direction in the prior art have a triple structure inside and outside the coaxial, and the length in the axial direction of the apparatus is shortened compared to the conventional one. Thus, miniaturization is achieved. Therefore, for example, when the converter unit 1 is mounted on a vehicle, the mountability is greatly improved. In addition, since a good balance of the DC circuit, which is a feature of the hollow cylindrical structure, can be secured, noise is suppressed, which is advantageous for an EMC (Electro-Magnetic Compatibility) problem.

  Furthermore, in the converter unit 1 of the first embodiment, the input capacitor 2 and the output capacitor 5 are arranged side by side in the axial direction and have the same outer diameter. According to this, it is possible to reduce the size including the output capacitor 5.

  Furthermore, in the converter unit 1 of the first embodiment, the upper switch unit 41 is electrically connected to the fifth terminal 511 via the high-voltage side output electrode 43, and the lower switch unit 42 includes the input capacitor 2 and the output capacitor. 5 is electrically connected to the low-voltage side common electrode 24 and the channel material 44 interposed in the radial direction. According to this, the high-voltage side output electrode 43 and the channel material 44 are used as the minimum length lead. Therefore, stray inductance is further reduced and noise is suppressed.

  Furthermore, in the converter unit 1 of the first embodiment, the first terminal 211 is led to the cylindrical inner conductor 921 around the central axis CL via the flange-shaped electrode 931 extending in the radial direction, and the second terminal The 212 and the sixth terminal 512 are led to the cylindrical outer conductor 922 around the inner conductor 921 via the cylindrical outer peripheral electrode 23 and the radially extending flange-shaped electrode 932, and the inner conductor 921 and the outer conductor 922 is disposed inside and outside the coaxial line and is electrically connected to the DC power supply 91. This eliminates the need for a lead between the input and output on the low voltage side, thereby reducing stray inductance. Further, the internal conductor 921 and the external conductor 922 can also ensure good balance of the DC circuit. Therefore, noise can be further suppressed. In addition, since the outer peripheral electrode 23 on the low-voltage side is shared by the outer periphery of the hollow cylindrical shape, the high-voltage portion can be electrically shielded and safety is high.

  Furthermore, in the converter unit 1 of the first embodiment, the connection surface 25 of the high-voltage side terminal 211 of the input capacitor 2 and the input-side terminal 311 of the reactor 3 are in direct contact with each other, and the output of the reactor 3 The side terminal 312 and the connection surface 33 of the high-voltage side intermediate electrode 32m come into contact with each other and are directly electrically connected. According to this, a lead becomes unnecessary in the place where terminals are directly connected, and stray inductance is reduced. Therefore, noise is further suppressed, which is advantageous for the EMC problem.

  Further, in the power conversion device 1 </ b> A of the first embodiment, the inverter unit 6 that is electrically connected to the fifth terminal 511 and the sixth terminal 512 is disposed on the inner diameter side of the output capacitor 5. According to this, it becomes possible to reduce the size of the power conversion device 1A by integrating the converter unit 1 and the inverter unit 6, and the mountability to a hybrid vehicle or an electric vehicle is greatly improved. In addition, since all circuit elements constituting the power conversion device 1A can be arranged coaxially and in a rotationally symmetrical manner, the DC circuit balance and the three-phase AC circuit rotational symmetry are extremely good. Furthermore, the length of the lead connecting the converter unit 1 and the inverter unit 6 can be shortened. Therefore, stray inductance is reduced and noise is suppressed, which is advantageous for the EMC problem.

  Furthermore, in the power conversion device 1A of the first embodiment, the power conversion unit 4 and the inverter unit 6 are arranged with the low-voltage side common electrode 24 interposed therebetween, and the upper side arranged side by side in the axial direction of the inverter unit 6. Inverter output electrodes 63U, 63V, 63W are provided between the switch units 61U, 61V, 61W and the lower switch units 62U, 62V, 62W. According to this, the inverter unit 6 and the converter unit 1 are combined in a compact manner and arranged with high density. In addition, the inverter unit 6 itself is compactly configured. Accordingly, the power conversion device 1A is significantly reduced in size and weight.

  Furthermore, in the power conversion device 1A of the first embodiment, the power semiconductor modules 41S and 42S of the power conversion unit 4 have a plate shape, and collector terminals 41C and 42C are formed on one surface, and gate terminals 41G and the other surface. 42G and emitter terminals 41E and 42E are formed, the collector terminals 41C and 42C are electrically connected to the electrodes 43P and 32m directly by soldering, and the emitter terminal 42E is made of the channel material 44. The low voltage side common electrode 24 is electrically connected. The power semiconductor modules 61S and 62S of the inverter unit 6 are plate-shaped, and collector terminals 61C and 62C are formed on one surface, and gate terminals 61G and 62G and emitter terminals 61E and 62E are formed on the other surface. The collector terminals 61C, 62C are electrically connected to the electrodes 53P, 63U, 63V, 63W directly using soldering, and the emitter terminal 62E is electrically connected to the low-voltage side common electrode 24 using the channel material 64. It is connected to the.

  According to this, no lead is required at the collector terminals 41C and 42C, and the channel material 44 is used as the minimum length lead at the emitter terminal 42E. Similarly, no leads are required at the collector terminals 61C and 62C, and the channel material 64 is used as a minimum length lead at the emitter terminal 62E. Therefore, stray inductances in the power conversion unit 4 and the inverter unit 6 are further reduced, and noise is suppressed. Also, the collector terminals 41C, 42C, 61C, and 62C are soldered, so that the heat generated in the power semiconductor modules 41S, 42S, 61S, and 62S is efficiently transferred to the electrodes 43P, 32m, 53P, 63U, 63V, and 63W. As a result, the surface area of heat dissipation is equivalently increased. Therefore, it is advantageous for cooling the power semiconductor modules 41S, 42S, 61S, and 62S.

  Next, the power converter 1B of the second embodiment will be described mainly with respect to differences from the power converter 1A of the first embodiment. FIG. 4 is a sectional view on one side with respect to the central axis CL for explaining the structure of the power conversion device 1B of the second embodiment. In the power conversion device 1B of the second embodiment, the central axis CL is composed of a coaxial inner / outer triple structure composed of the input capacitor 2, the reactor 3, and the power converter 4, and a coaxial inner / outer duplex structure composed of the output capacitor 5 and the inverter unit 6. The basic configuration lined up in the axial direction is the same.

  In the second embodiment, an insulating member 941 is interposed between the flange-shaped electrode 931 of the inner conductor 921 and the flange-shaped electrode 932 of the outer conductor 922. Similarly, an insulating member 942 is inserted between the outer peripheral electrode 23 and the input capacitor 2, and an insulating member 943 is inserted between the outer peripheral electrode 23 and the output capacitor 5. Further, an insulating member 944 is inserted between the core 36 of the reactor 3 and the flange-shaped electrode 931, and an insulating member 945 is inserted between the core 36 and the low-voltage side common electrode 24. Further, an insulating member 946 is interposed between the flange-shaped electrode 931 and the high-voltage side output electrode 43. By these insulating members 941 to 946, a predetermined insulating distance is secured and the insulating performance is maintained.

  Further, the second terminal 212 of the input capacitor 2 is omitted, and the low-voltage side common electrode 24 also serves as the second terminal 212.

  Further, in the power conversion unit 4, there is a slight gap between the high-voltage side switching element 41S and the high-voltage side intermediate electrode 32m. For this reason, the emitter terminal 41E of the switching element 41S is electrically connected to the high-voltage side intermediate electrode 32m using the lead member 45 having the minimum length. On the other hand, the emitter terminal 42E of the switching element 42S on the low voltage side is also electrically connected to the low voltage side common electrode 24 using the lead member 46 having the minimum length.

  Similarly, in the inverter unit 6, there is a slight gap between the switching element 61 </ b> S of the upper switch portions 61 </ b> U, 61 </ b> V, 61 </ b> W and the high-voltage side inverter input electrode 53. For this reason, the emitter terminal 61E of the switching element 61S is electrically connected to the inverter output electrodes 63U, 63V, 63W using the lead member 65 having the minimum length. On the other hand, the emitter terminal 62E of the switching element 62S of the lower switch portions 62U, 62V, and 62W is also electrically connected to the low voltage side common electrode 24 using the lead member 66 having the minimum length. Further, the three-phase inverter output electrodes 63U, 63V, 63W are bent radially inward and drawn out in the axial direction (downward in FIG. 4) and connected to the three-phase AC load 99.

  Next, a description will be given of a power converter 1 </ b> C according to a modified example in which the dimensions are changed from those of the second embodiment. FIG. 5 is a cross-sectional view on one side with respect to the central axis for explaining the structure of the power conversion device 1 </ b> C of a modification of the second embodiment. In the modification of 2nd Embodiment, the height dimension of the axial direction of the power converter 4 and the inverter unit 6 is reduced. As a result, the lead members 45, 46, 65, and 66 are unnecessary, and the emitter terminals 41E, 42E, 61E, and 62E are electrically connected to the electrodes 32m, 24, 63U, 63V, and 63W directly by soldering. Connected to.

  In the modification of the second embodiment, the radial dimension ratio (W21 / W22) between the input capacitor 2 and the reactor 3 is changed from the radial dimension ratio (W11 / W12 in FIG. 4) of the second embodiment. ing. Similarly, the axial dimension ratio (H21 / H22) between the input capacitor 2 and the output capacitor 5 is changed from the axial dimension ratio (H11 / H12 in FIG. 4) of the second embodiment. Thus, by changing the dimensions, the capacitance values of the input capacitor 2 and the output capacitor 5 and the inductance value of the reactor 3 can be freely changed.

  Since the effects of the power converters 1B and 1C of the second embodiment and its modifications are the same as those of the first embodiment, description thereof is omitted.

  Next, regarding the power conversion device 1D of the third embodiment, differences from the power conversion devices 1A to 1C of the first and second embodiments will be mainly described. FIG. 6 is a sectional view on one side with respect to the central axis CL for explaining the structure of the power conversion device 1D of the third embodiment. The power conversion device 1D according to the third embodiment specifies the arrangement of the gate drive circuit 47 of the power conversion unit 4D and specifies the arrangement of the three-phase gate drive circuit 67 of the inverter unit 6D.

  In the third embodiment, the gate drive circuit 47 of the power conversion unit 4D is inserted in the middle of the arrangement in the axial direction of the central axis CL. As shown in FIG. 6, the gate drive circuit 47 is interposed between the upper switch portion 41 and the high-voltage intermediate electrode 32m. Alternatively, the gate drive circuit 47 may be interposed between the high-voltage intermediate electrode 32m and the lower switch unit 42. The gate drive circuit 47 sends a gate control signal to the gate terminals 41G and 42G of the switching elements 41S and 42S on the high voltage side and the low voltage side.

  In addition, the three-phase gate drive circuit 67 of the inverter unit 6D is inserted in the middle of the arrangement in the axial direction of the central axis CL. The three-phase gate drive circuit 67 is interposed between the upper switch portions 61U, 61V, 61W and the three-phase inverter output electrodes 63U, 63V, 63W. Alternatively, the three-phase gate drive circuit 67 may be interposed between the inverter output electrodes 63U, 63V, 63W and the lower switch units 62U, 62V, 62W. The three-phase gate drive circuit 67 sends a gate control signal to the gate terminals 61G and 62G of the switching elements 61S and 62S of the inverter unit 6D.

  FIG. 7 is a side view for explaining the configuration in the vicinity of the three-phase gate drive circuit 67 of the inverter unit 6D. The three-phase gate driving circuit 67 is divided into phases. The three-phase gate drive circuit 67 for each phase drives the switching elements 61S for the upper switch portions 61U, 61V, 61W and the switching elements 62S for the lower switch portions 62U, 62V, 62W for the respective phases. The three-phase gate drive circuit 67 for each phase is formed by using a printed circuit board 67P having a shape in which a ring is divided into six equal parts. Three resistors 681 to 683 are mounted on one surface of the printed board 67P (the lower surface in FIG. 7) to form a drive circuit for the upper switch portions 61U, 61V, and 61W. Further, three resistors 684 to 686 are mounted on the other surface of the printed circuit board 67P (the upper surface in FIG. 7) to form a drive circuit for the lower switch portions 62U, 62V, and 62W.

  In FIG. 7, the collector electrode 61C of the switching element 61S of the upper side switch portions 61U, 61V, 61W is formed substantially on the entire module bottom surface. The collector electrode 61 </ b> C is electrically connected directly to the high-voltage inverter input electrode 53 using soldering 691. The emitter terminal 61E of the switching element 61S is electrically connected to the U-phase inverter output electrode 63U using the channel material 64 or the lead member 66 having the minimum length. The gate terminal 61G of the switching element 61S is directly electrically connected to the nearest three-phase gate drive circuit 67.

  On the other hand, the collector electrode 62C of the switching element 62S of the lower switch sections 62U, 62V, 62W is directly electrically connected to the U-phase inverter output electrode 63U using soldering 692. The emitter terminal 62E of the switching element 62S is electrically connected to the low-voltage side common electrode 24 using a channel material (not shown) or a lead member having a minimum length. The gate terminal 62G of the switching element 62S is electrically connected to the three-phase gate drive circuit 67 using a lead member 695 having a minimum length.

  In the converter unit 1 constituting the power conversion device 1D of the third embodiment, the gate drive circuit 47 that sends a gate control signal to the gate terminals 41G and 42 of the switching elements 41S and 42S is arranged in the axial direction of the central axis CL. It is inserted on the way. According to this, the lead connecting the switching elements 41S and 42S and the gate drive circuit 47 can be made the minimum length. Therefore, the stray inductance in the converter unit 1 is reduced and noise is suppressed.

  In the power converter 1D of the third embodiment, the three-phase gate drive circuit 67 that sends a gate control signal to the gate terminals 61G and 62G of the switching elements 61S and 62S of the inverter unit 6D is provided in the axial direction of the central axis CL. It is inserted in the middle of the arrangement. According to this, the lead connecting the switching elements 61S and 62S and the three-phase gate drive circuit 67 can be made the minimum length. Therefore, stray inductance in the inverter unit 6D is reduced and noise is suppressed.

  Next, the power converter integrated motor device 7 of the fourth embodiment will be described. FIG. 8 is a cross-sectional view schematically showing the power converter integrated motor device 7 of the fourth embodiment. This inverter-integrated motor device 7 has a configuration in which the power conversion device 1D of the third embodiment and the three-phase motor 8 are integrated by being arranged on the central axis CL in a large cylindrical housing 89. Yes. The three-phase motor 8 corresponds to a three-phase AC load 99, and can be a three-phase synchronous motor capable of generating power, for example.

  The three-phase motor 8 includes an inner peripheral rotor 81 and an outer peripheral stator 85. The rotor 81 includes a rotor core 82, an output shaft 83, a magnetic pole (not shown), and the like. The rotor core 82 is formed in a cylindrical shape by laminating a large number of annular electromagnetic steel plates in the central axis CL direction. The output shaft 83 is inserted and fixed in the cylindrical center of the rotor core 82 and rotates integrally with the rotor core 82. Two places on the front side and the rear side of the output shaft 83 are rotatably supported by bearing members 891 and 892 on the housing 89 side. Further, magnetic poles are embedded near the outer peripheral surface of the rotor core 82 so that N poles and S poles are alternately arranged at equal pitches in the circumferential direction.

  The stator 85 is fixed to the housing 89 with a slight gap around the rotor 82. The stator 85 includes a stator core 86, a three-phase armature winding 88, and the like. The stator core 86 is formed in a cylindrical shape by laminating a large number of annular electromagnetic steel plates having a larger diameter than the rotor core 82 side. The stator core 86 has magnetic teeth 87 that are arranged at an equal pitch in the circumferential direction and project in the center direction. The armature winding 88 is formed by winding a conductor in a slot around each magnetic pole tooth 87.

  The power conversion device 1D is insulatively attached in the housing 89 using an insulator (not shown). The three-phase inverter output electrodes 63U, 63V, 63W of the power conversion device 1D are electrically connected to the armature winding 88 while maintaining insulation with respect to the housing 89.

  The power converter integrated motor device 7 of the fourth embodiment is integrally provided with a three-phase motor 8 on the central axis of the power converter 1D of the third embodiment.

  According to this, the motor device 7 can be miniaturized by integration, and the mountability to a hybrid vehicle or an electric vehicle is greatly improved. In addition, since the power conversion device 1D and the three-phase motor 8 can be configured to be rotationally symmetric around the center axis CL, the DC circuit balance and the three-phase AC circuit rotational symmetry are extremely good. Furthermore, the length of the inverter output electrodes 63U, 63V, 63W connecting the power conversion device 1D and the three-phase motor 8 can be shortened. Therefore, stray inductance is reduced and noise is suppressed, which is advantageous for the EMC problem.

  In addition, in the power converters 1A to 1D of the first to third embodiments, when the temperature rise in the reactor 3, the power converter 4, and the inverter unit 6 is severe, the coolant is forced into the devices 1A to 1D. A circulating cooling structure can be appropriately employed. Further, the coaxial inner / outer triple structure composed of the input capacitor 2, the reactor 3, and the power conversion unit 4 and the coaxial inner / outer duplex structure composed of the output capacitor 5 and the inverter unit 6 are separated from each other without being arranged in the axial direction of the central axis CL. It is also possible to arrange them. The present invention can have various other applications and modifications.

  The power conversion device and the power conversion device-integrated motor device of the present invention can be used by being mounted on a hybrid vehicle or an electric vehicle. In addition, the power conversion device of the present invention can be used without being integrated with a three-phase motor, and can be used for distributed power generation facilities and various power supply facilities.

1A to 1D: Power converter 1: Converter unit 2: Input capacitor 211: First terminal 212: Second terminal 23: Peripheral electrode 24: Low voltage side common electrode (low voltage side inverter input electrode)
3: Reactor 311: Third terminal 312: Fourth terminal 32m: High-voltage side intermediate electrode 35: Coil 36: Core 4, 4D: Power conversion unit 41: Upper switch unit 42: Lower switch unit 41S, 42S: Switching element 43 : High voltage side output electrode 44: Channel material 47: Gate drive circuit 5: Output capacitor 511: Fifth terminal 512: Sixth terminal 53: High voltage side inverter input electrode 6, 6D: Inverter unit 61U, 61V, 61W: Upper side of each phase Switch part 62U, 62V, 62W: Each phase lower side switch part 61S, 62S: Switching element 63U, 63V, 63W: Each phase inverter output electrode 64: Channel material 67: Three-phase gate drive circuit 7: Inverter integrated motor apparatus 8 : Three-phase motor 81: Rotor 85: Stator 89: Housing 91: Direct Power 921: internal conductor 922: external conductor 99: three-phase AC load CL: center axis

Claims (7)

An input capacitor that has a hollow cylindrical shape and is electrically connected to the DC power source via the first terminal and the second terminal;
It has a hollow cylindrical shape, is arranged on the inner diameter side of the input capacitor, is electrically connected to the first terminal, and is connected to the input terminal, and to the output electrode connected to the intermediate electrode. A reactor having four terminals;
An upper switch portion that is disposed on an inner diameter side of the reactor and that performs switching control; and a lower switch portion that is electrically connected to the second terminal and performs switching control, and the upper switch portion and the lower switch portion The side switch unit is a power conversion unit electrically connected to the fourth terminal through the intermediate electrode;
An output capacitor having a hollow cylindrical shape and having a fifth terminal electrically connected to the upper switch portion on the high voltage side and a sixth terminal electrically connected to the second terminal on the low voltage side;
A power conversion device comprising:   The power converter according to claim 1, wherein the input capacitor and the output capacitor are arranged side by side in the axial direction and have the same outer diameter. The upper switch portion is electrically connected to the fifth terminal via the high-voltage side output electrode,
3. The electric power according to claim 1, wherein the lower switch unit is electrically connected via a channel material to a low-voltage common electrode that is radially interposed between the input capacitor and the output capacitor. Conversion device. The first terminal is led to a cylindrical inner conductor around a central axis through an electrode extending in a radial direction,
The second terminal and the sixth terminal are led to a cylindrical outer conductor around the inner conductor via a cylindrical electrode and a radially extending electrode,
The power converter according to any one of claims 1 to 3, wherein the inner conductor and the outer conductor are arranged on the same axis and are electrically connected to the DC power source.   The power conversion device according to any one of claims 1 to 4, wherein an inverter unit electrically connected to the fifth terminal and the sixth terminal is disposed on an inner diameter side of the output capacitor. The power conversion unit and the inverter unit are disposed with the low-voltage side common electrode interposed therebetween,
An inverter output electrode is provided between the upper switch portion and the lower switch portion arranged side by side in the axial direction of the inverter unit,
The power conversion device according to claim 5 quoting claim 3.   A power converter integrated motor device in which a three-phase motor is integrally provided on the central axis of the power converter according to claim 5.

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