JP4564989B2 - Power conversion apparatus and moving body equipped with the same - Google Patents

Description

  The present invention relates to a power conversion device that controls electric power supplied to an electric motor and a mobile body including the same.

  As conventional power converters, for example, those described in JP-A-8-140363 and JP-A-11-89247 are known. In the former publication, a semiconductor element, a snubber capacitor, a DC bus, and a smoothing capacitor are sequentially arranged in a laminated form on a cooling body to shorten a wiring distance and reduce a wiring inductance. In the latter publication, the wiring section between the capacitor and the inverter section has a structure in which the first to third plate conductors and the first and second insulating sheets are alternately laminated, and the wiring Inductance is reduced.

  In recent years, electric vehicles such as electric vehicles and hybrid vehicles, which are driven by an electric motor, have been used to reduce costs, improve fuel consumption, improve the mileage per charge, and reduce the mounting space of the device. In addition, studies on downsizing of a power conversion device that converts DC power supplied from a battery into AC power and supplies it to an electric motor are underway, and a power conversion device that is further downsized than the above-described conventional power conversion device Realization of is desired.

  In addition, in electric vehicles, studies are underway to reduce the inductance of power converters in order to control large currents that are required when a large torque output is required, such as when a wheel is driven only by an electric motor or when torque assist is performed by an electric motor. Therefore, it is desired to realize a power converter that can further reduce the inductance as compared with the above-described conventional power converter. Moreover, it is desirable to realize a power conversion device that can reduce inductance with a small mounting area from the viewpoint of downsizing the power conversion device described above.

  A typical object of the present invention is to provide a power conversion device that is miniaturized and a mobile body including the same. Another representative object of the present invention is to provide a power conversion device that achieves both a reduction in size and a reduction in inductance, and a moving body including the power conversion device.

In order to achieve the above object, a power conversion device according to the present invention includes a power module unit and a capacitor circuit unit, and the power module unit has a quadrangular shape and has electrical conductivity to generate an eddy current. A heat sink to be flown, a positive DC terminal and a negative DC terminal arranged in a laminated state including a plurality of positive electrode connection portions and negative electrode connection portions for U phase, V phase, and W phase, a first semiconductor switch, and a second semiconductor switch A series circuit for U-phase, V-phase, and W-phase each having a semiconductor switch, and in the power module unit, the two opposite sides of the rectangular heat sink are defined as the left and right sides, respectively. When the direction connecting the sides is defined as the left-right direction, one of the directions perpendicular to the left-right direction is defined as one and the other as the other, the U-phase, V-phase, and W-phase series circuits are Are arranged side by side, Further, the series circuit of each phase arranges the first semiconductor switch in the first column based on the two columns of the first column and the second column arranged in the left-right direction, and the second semiconductor switch is arranged in the second column. The positive electrode connecting portion and the negative electrode connecting portion arranged in a row and supplying DC power to each phase are shifted to the one side and further to the first row from the first and second semiconductor switches. The first semiconductor switch provided on the first column side is further shifted from the second semiconductor switch arranged on the second column to the other side, and further arranged on the second column. A connecting conductor plate for electrical connection is provided at a position on the other side of the second semiconductor switch, and the connecting conductor plate is partially connected to the first semiconductor switch in a direction along a row. Overlapping the first semiconductor switch and the front A second semiconductor switch is electrically connected via the connection conductor plate, and the capacitor circuit portion includes a laminated conductor plate for supplying DC power and a power source for receiving DC power from the DC power source. Each of the laminated conductor plates includes a DC power supply terminal for supplying DC power to the power module unit, and is provided between the DC power supply terminal and the power supply terminal. The plurality of capacitors are connected to each other.

In the power conversion device according to the present invention, preferably, a left-right electrical circuit is formed between the first semiconductor switch and the connection conductor plate, and the connection conductor plate is in a direction along the second row. And the connecting conductor plate is connected to the second semiconductor switch through an electric circuit in a direction along the second row.

The power conversion device according to the present invention is preferably characterized in that the plurality of capacitors are connected to and held by the conductor plates arranged in the laminated shape.

The power conversion device according to the present invention is preferably formed at an end portion of the laminated conductor plate, and a DC power supply terminal of the laminated conductor plate is formed integrally with the laminated conductor plate. The DC power supply terminal is directly connected to the positive DC terminal and the negative DC terminal of the power module unit.

In the power conversion device according to the present invention, preferably, an electric circuit in a left-right direction is provided between the first semiconductor switch provided in the power module unit and the connection conductor plate, and the connection conductor plate includes An electric circuit in the column direction is formed, the first semiconductor switch and the connection conductor plate are connected via the electric circuit in the left-right direction, and the connection between the connection conductor plate and the first semiconductor switch is the It is performed through the electric circuit in the row direction formed on the connecting conductor plate.

In the power conversion device according to the present invention, preferably, the electric circuit in the left-right direction for connecting the first semiconductor switch and the connection conductor plate is wire bonding arranged in the left-right direction. It is characterized by.

  According to the present invention, since the main circuit wiring area can be reduced, the power conversion device can be reduced in size. Further, according to the present invention, since the eddy current facing the annular electrical path can be passed through the conductive member, the inductance of the power converter can be reduced. Therefore, according to the moving body equipped with the drive system equipped with the power conversion device of the present invention, it is possible to reduce the price, improve the fuel consumption, improve the travel distance per charge, and reduce the mounting space of the device. it can. Further, it is possible to perform large current control required when a large torque output is requested, such as when a wheel is driven only by the electric motor or when torque assist is performed by the electric motor, and the moving body can be smoothly driven when starting.

  Embodiments of the present invention will be described below with reference to the drawings. The power conversion device includes, for example, a rectifier that converts AC power into DC power, an inverter device that converts DC power into AC power, a combination of the rectifier and the inverter device, and the input DC power is converted to a desired DC power. There is a DC-DC converter device that converts the signal into a DC-DC converter. In an embodiment of the present invention, an electric vehicle using an electric motor as the only drive source, a hybrid vehicle using an electric motor and an internal combustion engine as a drive source, one of the front and rear wheels is driven by the internal combustion engine, and the other of the front and rear wheels is driven by the motor. An explanation will be given by taking as an example an inverter device that converts DC power output from a battery into an AC motor and supplies the motor to the motor in an electric four-wheel drive vehicle. In addition, the structure of the Example of this invention demonstrated below is applicable not only to an inverter apparatus but to a rectifier, a DC-DC converter, etc.

  FIG. 7 shows a configuration example of an automobile to which the inverter device according to the embodiment of the present invention is applied. The vehicle 100 of this example is a hybrid vehicle that uses an engine 53 that is an internal combustion engine and an AC motor 54 such as an induction motor or a synchronous motor as drive sources. An axle 51e having front wheels 51a and 51b provided at the ends is rotatably attached to the front portion of the vehicle body 50. An axle 51f provided with rear wheels 51c and 51d at its ends is rotatably attached to the rear portion of the vehicle body 50. An engine 53 is mechanically connected to the axle 51e via a transmission mechanism. An AC motor 54 is mechanically connected to the engine 53.

  To the AC motor 54, DC power output from the battery 57 is converted into three-phase AC power by the inverter device 55 and supplied via the power line 59. For example, a torque command signal or a current command signal output from a control device 55 such as an engine control unit (ECU) is input to the inverter device 55. The control device 55 calculates a torque command value, a current command value, and the like based on the driving state signal of the automobile input via the signal terminal 58, the start, acceleration, deceleration, and stop command signals from the driver. And output as a torque command signal or a current command signal. The inverter device 55 that receives the torque command signal and the current command signal generates a PWM (Pluse Width Modulation) signal to control the switching operation (on / off operation) of the semiconductor element, and controls the switching operation of the semiconductor element. The DC power supplied from the battery 57 is converted into three-phase AC power and supplied to the AC motor 54. As a result, the AC motor 54 is driven.

  In the hybrid vehicle, the wheel drive by the engine 53 is stopped and the wheel drive is performed only by the torque (output) of the AC motor 54 when the vehicle is started at a low load such as at low speed. Therefore, the torque of the AC motor 54 is transmitted as driving force to the axle 51e via the engine 53 and the transmission device 52, and drives the front wheels 51a and 51b. During high-load running such as acceleration, wheels are driven by both the engine 53 and the AC motor 54. For this reason, the torque of the AC motor 54 is transmitted to the engine 53 for torque assist. The AC motor 54 is driven by the engine 53 at the time of deceleration and stop. For this reason, the AC motor 54 generates AC power. The generated AC power is converted into DC power by the inverter device 55 and supplied to the battery 57 for charging.

  In this example, the hybrid vehicle has been described. However, in the configuration of FIG. 7, the engine 53 is removed and only the AC motor 54 is used as the drive source, so that the electric vehicle can be configured as the only drive source. In the configuration of FIG. 7, the AC motor 54 is mechanically connected to the axle 51f via a transmission mechanism, or another motor is prepared, and the motor is mechanically connected to the axle 51f via the transmission mechanism. Thus, an electric four-wheel drive vehicle in which the front wheels are driven by the engine and / or the AC motor 54 and the rear wheels are driven by the AC motor 54 or another motor can be provided.

  FIG. 5 shows a circuit configuration of the inverter device 55 mounted on the automobile 100 of FIG. The inverter device 55 includes a power module unit 30 including an electrolytic capacitor 29 and a control unit (not shown) that controls a switching operation (on / off operation) of a semiconductor element included in the power module unit 30. A battery 57, which is a DC power supply, is electrically connected to the input side of the power module unit 30 via the main circuit wiring 33. The main circuit wiring 33 is electrically connected in parallel with an electrolytic capacitor 29 that is a capacitive element for suppressing fluctuations in the DC voltage due to the switching operation of the semiconductor element. In this example, the electrolytic capacitor is illustrated, but it is not necessary to be limited to the electrolytic capacitor as long as it is a capacitive element that can perform the above function. An AC motor 54 is electrically connected to the output side of the power module unit 30 via a three-phase output wiring 59 composed of a U phase, a V phase, and a W phase. In the inverter device 55, DC power supplied from the battery 57 through the main circuit wiring 33 is converted into three-phase AC power of variable frequency and variable voltage by switching operation of the semiconductor element of the power module unit 30, and this three-phase AC power is converted. Electric power is supplied to the AC motor 54 via the three-phase output wiring 59.

  FIG. 6 shows a circuit configuration of the power module unit 30 of FIG. A first circuit in which a semiconductor switch 18a and a diode 19a are connected in parallel, and a semiconductor switch 18b and a diode 19b are connected in parallel between the positive DC terminal 3 and the negative DC terminal 2 that are electrically connected to the battery. The series circuit of the second circuit is a series circuit of the third circuit in which the semiconductor switch 18c and the diode 19c are connected in parallel, and the fourth circuit in which the half switch 18d and the diode 19d are connected in parallel. A series circuit of a fifth circuit in which a semiconductor switch 18e and a diode 19e are connected in parallel and a sixth circuit in which a half switch 18f and a diode 19f are connected in parallel are connected to each other to form a three-phase bridge circuit. Has been. A U-phase output terminal 4 is provided between the first circuit and the second circuit, and a V-phase output terminal 5 is provided between the third circuit and the fourth circuit. A W-phase output terminal 6 is electrically connected to the circuit 6.

  20a is a control terminal provided in the semiconductor switch 18a, 20b is a control terminal provided in the semiconductor switch 18b, 20c is a control terminal provided in the semiconductor switch 18c, 20d is a control terminal provided in the semiconductor switch 18d, 20e is a control terminal provided in the semiconductor switch 18e, and 20f is a control terminal provided in the semiconductor switch 18f. Further, in the semiconductor switches 18a to 18f, the voltage between the control terminal and the negative terminal of the semiconductor switch becomes an operation signal to perform the switching operation. For this reason, the semiconductor switches 18a to 18f are provided with a negative electrode side terminal for connection to the drive circuit of the control unit in addition to the control terminal, which is not shown in the present example.

  The semiconductor switches 18a, 18b, 18c, 18d, 18e, and 18f are constituted by power semiconductor elements represented by, for example, a MOS-FET (Metal Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). Here, since the MOS-FET includes a diode in the element structure, the semiconductor switch and the diode can be configured in one chip. For this reason, when the semiconductor switch is composed of a MOS-FET, mounting of a diode as a separate component can be omitted. In the MOS-FET, the above-described control terminal is called a gate terminal.

  A PWM control signal voltage is applied to the control terminals 20a to 20f of the semiconductor switches 18a to 18f from the drive circuit of the control unit in order to control the switching operation of the semiconductor switches 18a to 18f. With the applied PWM control signal voltage, each of the semiconductor switches 18a to 18f is controlled in switching operation time, that is, on / off operation time. With this control, the DC power supplied from the battery is changed to U-phase AC power in each bridge circuit, that is, the bridge circuit including the first and second circuits, and the V-phase in the bridge circuit including the third and fourth circuits. Are converted into W-phase AC power in a bridge circuit composed of the fifth and sixth circuits. The converted U-phase AC power is supplied via the U-phase output terminal 4, the V-phase AC power is supplied via the V-phase output terminal 5, and the W-phase AC power is supplied via the W-phase output terminal 6. Are supplied to the AC motor 54 respectively. As a result, the AC motor 54 is driven.

  As described above, the AC motor 54 may be driven by the engine. In this case, the AC motor 54 generates three-phase AC power by driving. The generated three-phase AC power is supplied as regenerative power to the bridge circuit via the output terminal corresponding to each phase, and is converted into DC power by the switching operation of the semiconductor switches 18a to 18f. The converted AC power is supplied to the battery via the positive DC terminal 3 and the negative DC terminal 2. The battery charges the supplied DC power.

  FIG. 4 shows an external configuration of an actual inverter device 55 to which the circuit configuration of the inverter device 55 of FIG. 5 is applied. The inverter device 55 of this example is configured such that a power module unit (excluding the electrolytic capacitor 29) and a control unit are housed in the same sealed container. The inverter case 1 which is a sealed container is fixed on the conductor surface of the cooling fin 36 which is a heat radiating member by screwing the bottom wall formed from the heat radiating plate 7 having conductivity. From one of the opposing side walls of the inverter case 1, plate-like output terminals 4 to 6 protrude and extend outward from the inverter case 1. The output terminals 4 to 6 are electrically connected to the AC motor 54 via an output wiring 59 (power cable).

  A planar plate-like input terminal protrudes from the other side of the opposing side wall of the inverter case 1 and extends outward from the inverter case 1. The input terminal is formed by laminating a positive DC terminal 3 and a negative DC terminal 2 with a flat plate-like insulating member 9 interposed therebetween. The negative DC terminal 2 is on the lower layer side, and the positive DC terminal 3 is on the upper layer side. Is arranged. The negative DC terminal 2 extends to the outside of the inverter case 1 more than the positive DC terminal 3. A laminated body in which a flat plate-like conductor plate 21 and a flat plate-like conductor plate 22 are laminated via a flat plate-like insulating member 23 is fixed to the input terminal by screwing. An electrolytic capacitor 29 is attached to the laminated body of the conductor plates 21 and 22 and the insulating member 23, and is electrically connected to the conductor plates 21 and 22, respectively. A battery 57 is electrically connected to the laminated body of the conductor plates 21 and 22 and the insulating member 23.

  A plurality of auxiliary control terminals 26 electrically connected to a circuit constituting a control unit in the inverter case 1 protrude from the upper wall of the inverter case 1 and extend outward from the inverter case 1. The auxiliary control terminal 26 is electrically connected to a host controller such as an engine control unit (ECU), and is used for receiving or transmitting a torque command signal or a current command signal output from the host controller. is there. The control unit is operated based on an interface circuit that inputs and outputs signals, for example, a sensor circuit that detects three-phase AC power supplied to the AC motor 54, a torque command signal and a current command signal output from the host controller, etc. A computer that performs processing and outputs a PWM control signal, a PWM control signal output from the computer is stepped up or down, and is driven to a drive circuit, a sensor circuit, a computer, and an interface circuit that outputs a drive signal to switch the semiconductor switch. A plurality of electronic components constituting each of the control power supplies that supply electric power are mounted on the circuit board.

  1 to 3 show an arrangement configuration in the power module section 30 of the inverter device 55 according to the first embodiment of the present invention. The bottom wall of the inverter case 1 is formed by a heat radiating plate 7 made of copper or Al—SiC alloy having conductivity. Screw holes are formed at four locations on both ends of the heat sink 7. Output terminals 4 to 6 project into the inverter case 1 from one of the opposing side walls of the inverter case 1 and extend inward of the inverter case 1. An input terminal protrudes into the inverter case 1 from the opposite side wall of the inverter case 1 and extends inward of the inverter case 1.

  The input terminal is formed by laminating a positive DC terminal 3 and a negative DC terminal 2 with an insulating member 9 interposed therebetween, and is configured in a comb shape as shown in FIG. For this reason, three comb teeth of the comb-shaped input terminal protrude inside the inverter case 1, and the comb main body of the comb-shaped input terminal protrudes outside the inverter case 1. The negative DC terminal 2 located on the lower layer side of the three comb tooth portions of the input terminal extends inward of the inverter case 1 more than the positive DC terminal 3 located on the upper layer side. This is for securing a connecting portion with wire wiring to be described later.

  The output terminals 4 to 6 projecting into the inverter case 1 and the three comb-tooth portions of the input terminal are diagonally arranged on the heat sink 7 by being electrically insulated and supported by the inverter case 1. An insulating substrate 15a is disposed in a portion adjacent to the output terminal 4 while facing the extending direction side of the comb tooth portion of the input terminal located on the left side of the inverter case 1. An insulating substrate 15b is disposed at a portion adjacent to the comb-tooth portion of the input terminal that is opposite to the extending direction side of the output terminal 4 and is located on the left side and the center of the inverter case 1. An insulating substrate 15c is disposed at a portion adjacent to the output terminals 4 and 5 while facing the extending direction side of the comb tooth portion of the input terminal located at the center of the inverter case 1. An insulating substrate 15d is disposed in a portion facing the extending direction side of the output terminal 5 and adjacent to the comb-tooth portion of the input terminal located at the center and the right side of the inverter case 1. An insulating substrate 15e is disposed on a portion adjacent to the output terminals 5 and 6 while facing the extending direction side of the comb teeth of the input terminal located on the right side of the inverter case 1. An insulating substrate 15f is disposed at a portion adjacent to the comb-teeth portion of the input terminal that faces the extending direction side of the output terminal 6 and is located on the right side of the inverter case 1.

  A substrate conductor pattern 12a is formed on the insulating substrate 15a. A semiconductor switch 13a is mounted on the board conductor pattern 12a and is electrically connected to the board conductor pattern 12a. The substrate conductor pattern 12a is electrically connected to the negative DC terminal 2 of the comb tooth portion of the input terminal located on the left side of the inverter case 1 via the wire wiring 14a. The output terminal 4 is electrically connected to the semiconductor switch 13a via the wire wiring 14b.

  A substrate conductor pattern 12b is formed on the insulating substrate 15b. A semiconductor switch 13b is mounted on the board conductor pattern 12b and is electrically connected to the board conductor pattern 12b. The output terminal 4 is electrically connected to the board conductor pattern 12b via the wire wiring 14c. The positive electrode DC terminal 3 of the comb tooth portion of the input terminal located on the left side of the inverter case 1 is electrically connected to the semiconductor switch 13b via the wire wiring 14d.

  The electrical connection by the semiconductor switches 13a and 13b, the board conductor patterns 12a and 12b, and the wire wirings 14a, 14b, 14c, and 14d constitutes a bridge circuit for the U phase, and the input located on the left side of the inverter case 1 The DC power supplied from the comb-tooth portion of the terminal is converted into U-phase AC power by the switching operation of the semiconductor switches 13 a and 13 b, output from the output terminal 4, and supplied to the U-phase of the AC motor 54.

  A substrate conductor pattern 12c is formed on the insulating substrate 15c. A semiconductor switch 13c is mounted on the board conductor pattern 12c and is electrically connected to the board conductor pattern 12c. The substrate conductor pattern 12c is electrically connected to the negative DC terminal 2 of the comb-tooth portion of the input terminal located at the center of the inverter case 1 via the wire wiring 14e. The output terminal 5 is electrically connected to the semiconductor switch 13c via the wire wiring 14f.

  A substrate conductor pattern 12d is formed on the insulating substrate 15d. A semiconductor switch 13d is mounted on the board conductor pattern 12d and is electrically connected to the board conductor pattern 12d. The output terminal 5 is electrically connected to the substrate conductor pattern 12d through the wire wiring 14g. The positive electrode DC terminal 3 of the comb-tooth portion of the input terminal located in the center of the inverter case 1 is electrically connected to the semiconductor switch 13d through the wire wiring 14h.

  The electrical connections of the semiconductor switches 13c and 13d, the board conductor patterns 12c and 12d, and the wire wirings 14e, 14f, 14g, and 14h constitute a V-phase bridge circuit, and the input located at the center of the inverter case 1 The DC power supplied from the comb-tooth portion of the terminal is converted into V-phase AC power by the switching operation of the semiconductor switches 13 c and 13 d, output from the output terminal 5, and supplied to the V-phase of the AC motor 54.

  A substrate conductor pattern 12e is formed on the insulating substrate 15e. A semiconductor switch 13e is mounted on the board conductor pattern 12e and is electrically connected to the board conductor pattern 12e. The negative electrode DC terminal 2 of the comb-tooth portion of the input terminal located on the right side of the inverter case 1 is electrically connected to the substrate conductor pattern 12e via the wire wiring 14i. The output terminal 6 is electrically connected to the semiconductor switch 13e via the wire wiring 14j.

  A substrate conductor pattern 12f is formed on the insulating substrate 15f. A semiconductor switch 13f is mounted on the board conductor pattern 12f and is electrically connected to the board conductor pattern 12f. The output terminal 6 is electrically connected to the substrate conductor pattern 12f via the wire wiring 14k. The positive DC terminal 3 of the comb-tooth portion of the input terminal located on the right side of the inverter case 1 is electrically connected to the semiconductor switch 13f via the wire wiring 141.

  The electrical connections of the semiconductor switches 13e and 13f, the board conductor patterns 12e and 12f, and the wire wirings 14i, 14j, 14k, and 14l constitute a W-phase bridge circuit, and are located on the right side of the inverter case 1. The DC power supplied from the comb-tooth portion of the terminal is converted into W-phase AC power by the switching operation of the semiconductor switches 13 e and 13 f, output from the output terminal 6, and supplied to the W-phase of the AC motor 54.

  In the present embodiment, the case where a MOS-FET is used as a semiconductor switch has been described. However, even when an IGBT is used as a semiconductor switch, it can be configured as described above. When a MOS-FET is used as the semiconductor switch, the surface connected to the wire wiring is the source electrode surface, and the surface connected to the substrate conductor pattern is the drain electrode surface. On the same surface as the source electrode surface, a gate electrode surface that receives a switching operation signal (ON / OFF operation signal) of the semiconductor switch is formed.

  A drive circuit board connection terminal 24a electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15a. The semiconductor switch 13a is connected via a wire wiring 16a. Is electrically connected to the gate electrode surface. A drive circuit board connection terminal 24b that is electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15b, and the semiconductor switch 13b is connected via a wire wiring 16b. Is electrically connected to the gate electrode surface.

  A drive circuit board connection terminal 24c electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15c, and the semiconductor switch 13c is connected via a wire wiring 16c. Is electrically connected to the gate electrode surface. A drive circuit board connection terminal 24d electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15d, and the semiconductor switch 13d is connected via a wire wiring 16d. Is electrically connected to the gate electrode surface.

  A drive circuit board connection terminal 24e electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15e, and the semiconductor switch 13e is connected via the wire wiring 16e. Is electrically connected to the gate electrode surface. A drive circuit board connection terminal 24f electrically connected to a drive circuit of a control unit (not shown) is provided on the side surface of the inverter case 1 facing the insulating board 15f, and the semiconductor switch 13f is connected via a wire wiring 16f. Is electrically connected to the gate electrode surface.

  In this embodiment, the case where the semiconductor switch has two gate electrode surfaces and three drive circuit board connection terminals has been described. However, the semiconductor switch has functions such as current detection and temperature detection. The number of gate electrode surfaces increases. Further, when performing voltage detection, temperature detection, or the like, the number of drive circuit board connection terminals increases as the number of gate electrode surfaces increases.

  According to the present embodiment, the insulating substrates 15a to 15f, the three comb-tooth portions of the comb-shaped input terminals, and the output terminals 4 to 6 are alternately arranged in a checkered pattern on the heat sink 7 in the inverter case 1. Therefore, without providing an extra substrate conductor pattern on the insulating substrates 15a to 15f, between the semiconductor switches 13a to 13f and the three comb teeth portions of the comb-shaped input terminals and the output terminals 4 to 6 are provided. It can be directly electrically connected by wire wiring, and the number of wire wiring connection locations can be reduced. Thereby, the main circuit wiring area can be reduced and the power module unit 30 can be reduced in size. Therefore, the inverter device 55 can be reduced in size.

  Here, the main circuit wiring is an input terminal, an electrolytic capacitor, a wiring that forms a bridge circuit by a semiconductor switch between a negative DC terminal and a positive DC terminal of the input terminal, a negative DC terminal and a positive electrode of the input terminal Circuit wiring composed of wiring that connects an electrolytic capacitor to a DC terminal.

  When a semiconductor switch having a low on-resistance is used as the semiconductor switch, the loss in the main circuit wiring and the loss due to the on-resistance value of the semiconductor switch are approximately the same. For this reason, as described above, reducing wire wiring connection locations that occupy a large proportion of the main circuit wiring resistance is effective in increasing the efficiency of power conversion. In addition, the reduction in the number of wire wiring connection locations also leads to a reduction in the number of wire wiring connection man-hours, which is effective in reducing production costs.

  In the present embodiment, the negative DC terminal 2, the positive DC terminal 3 and the output terminals 4 to 6 and the substrate conductor patterns 12a to 12f are connected by the wire wirings 14a, 14c, 14e, 14g, 14i, and 14k. It may be performed with a thin plate-like conductor using solder bonding or ultrasonic bonding. According to the connection using the thin plate-like conductor, the connection man-hour can be further reduced as compared with the wire wiring connection. Moreover, since the connection area by a thin plate-shaped conductor can be made larger than a wire wiring total cross-sectional area, wiring resistance can be reduced.

  Further, according to the present embodiment, the insulating member 9 sandwiched between the negative DC terminal 2 and the positive DC terminal 3 is sandwiched to the front of the bonding surface of the negative DC terminal 2 with the wire wiring. Wiring inductance at the DC terminal 2 and the positive DC terminal 3 can be reduced.

  Further, according to the present embodiment, the inductance is reduced by the arrangement configuration of the output terminals 4 to 6 and the comb-shaped input terminals and the insulating substrates 15 a to 15 f in the inverter case 1. That is, in the inverter device, when the switching operation (ON / OFF operation) of the semiconductor switch is switched, the current value of the main circuit wiring greatly changes. For this reason, a voltage (a jumping voltage) determined by the product of the total inductance of the main circuit wiring and the electrolytic capacitor and the time differential value of the current amount in the main circuit wiring is generated in the main circuit wiring. This jump voltage is instantaneously applied to the semiconductor switch together with the power supply voltage when the switching operation of the semiconductor switch is switched. If the jumping voltage increases and the voltage applied when switching the switching operation of the semiconductor switch exceeds the element withstand voltage, there is a possibility of dielectric breakdown. It is necessary to suppress it. Therefore, it is necessary to reduce the inductance that causes the jumping voltage. This reduction in inductance is a particularly important issue in increasing the current of the inverter device.

  Therefore, in this embodiment, for example, the positive DC terminal 3 of the comb tooth portion of the input terminal located on the left side of the inverter case 1 → wire wiring 14d → semiconductor chip 13b → substrate conductor pattern 12b → wire wiring 14c → output conductor 4 → wire A loop-like current path is formed on the heat sink 7 such as the wiring 14b → the semiconductor chip 13a → the substrate conductor pattern 12a → the wire wiring 14a → the negative DC terminal 2 of the comb teeth of the input terminal located on the left side of the inverter case 1. Forming. As a result, when the amount of current changes with time, an eddy current facing the loop-shaped current path flows through the heat radiating plate 7, so that the inductance of the current path can be reduced by electromagnetic interference with the eddy current.

  Further, the inductance of the current path is reduced as the loop area of the current path is smaller. In the present embodiment, the insulating substrates 15a to 15f, the three comb-tooth portions of the comb-shaped input terminals, and the output terminals 4 to 6 are alternately arranged in a checkered pattern on the heat sink 7 in the inverter case 1. Since it is electrically connected so that a loop-shaped current path is formed on the heat sink 7 for each phase, the area of the loop-shaped current path can be minimized.

  In addition, there is a measure to use a semiconductor switch with a high breakdown voltage for the problem of jumping voltage, but when the breakdown voltage is increased, the semiconductor switch tends to have a large resistance value in the ON state. In particular, in systems where the power supply voltage is low and a large current flows through the semiconductor switch, the ratio of loss in the semiconductor switch in the ON state increases, so the jumping voltage due to inductance reduction can be suppressed by using a semiconductor switch with a lower withstand voltage. Can be possible. It is possible to obtain effects such as an improvement in lifetime reliability accompanying suppression of temperature rise due to reduced heat generation, a reduction in cooling cost, and a reduction in size of the cooling device.

  In addition, according to the arrangement configuration of the above-described embodiment, the wire wiring connected to the gate electrode surface of the semiconductor switch, for example, the wiring direction of the wire wiring 16a and the wiring direction of the wire wiring 14b in the vicinity thereof are approximately 90 degrees, That is, since it can be made orthogonal, the electromagnetic noise produced by the electric current which flows into the wire wiring 14b can be reduced.

  FIG. 8 shows an arrangement configuration in the power module section of the inverter device according to the second embodiment of the present invention. In the previous example, the inverter device for three-phase AC power conversion has been described. The inverter device of the present embodiment is for single-phase AC power conversion, and is configured in exactly the same way as the configuration of one phase (U phase) of the inverter device for three-phase AC power conversion of the previous example. Therefore, the same reference numerals as those in the previous example are attached, and the description thereof is omitted. In the present embodiment, the positive DC terminal 3 and the negative DC terminal 2 constituting the input terminal are formed in the same bar shape as the output terminal. According to the present embodiment, the inverter device can be reduced in size as in the previous example, and the inductance can be reduced.

The top view which shows the arrangement configuration in the power module part of the inverter apparatus which is 1st Example of this invention. II-II arrow sectional drawing of FIG. It is a top view which shows the arrangement configuration in the power module part of the inverter apparatus of FIG. 1, Comprising: The arrangement configuration when an inverter case is removed is shown. The perspective view which shows the external appearance structure of the inverter apparatus of FIG. The block diagram which shows the circuit structure of an inverter apparatus. The block diagram which shows the circuit structure of the power module part of the inverter apparatus of FIG. The block diagram which shows schematic structure of a hybrid vehicle. The top view which shows the arrangement configuration in the power module part of the inverter apparatus which is 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inverter case, 2 ... Negative DC terminal, 3 ... Positive DC terminal, 4-6 ... Output terminal, 7 ... Radiation bottom plate, 8 ... Screw hole, 9 ... Insulating member, 12a-12f ... Conductor pattern, 13a-13f ... Semiconductor switch, 14a-14l ... wire wiring, 15a-15f ... insulating substrate, 16a-16f ... wire wiring, 18a-18f ... semiconductor switch, 19a-19f ... diode, 20 ... control terminal, 21,22 ... conductor plate, 23 DESCRIPTION OF SYMBOLS Insulating member, 24a-24f ... Drive circuit board connection terminal, 26 ... Control auxiliary terminal, 29 ... Electrolytic capacitor, 30 ... Power module part.

Claims (6)

Power module part and capacitor circuit part,
The power module section has a quadrangular shape and a heat radiating plate that has electrical conductivity and allows an eddy current to flow therethrough, and a plurality of positive phase connection portions and negative polarity connection portions for U phase, V phase, and W phase. A series circuit for U-phase, V-phase, and W-phase, each including a positive DC terminal and a negative DC terminal arranged in a stacked state, and a first semiconductor switch and a second semiconductor switch;
In the power module unit, two sides facing each other of the rectangular heat sink are defined as left and right sides, the direction connecting the left and right sides is defined as the left-right direction, and one of the directions perpendicular to the left-right direction is defined as one. When the other is defined as the other, the U-phase, V-phase, and W-phase series circuits are arranged side by side in the left-right direction, and each phase series circuit is arranged in the left-right direction. The first semiconductor switch is arranged in the first column based on the two columns, and the second column, the second semiconductor switch is arranged in the second column, and the positive electrode connection supplies DC power to each phase. And the negative electrode connection portion are arranged on one side of the first and second semiconductor switches and further shifted toward the first row, and further provided on the first row side. Before one semiconductor switch is placed in the second row A connecting conductor plate for electrical connection is provided at a position on the other side of the second semiconductor switch arranged on the other side of the second semiconductor switch and further arranged on the second row, The connecting conductor plate partially overlaps the first semiconductor switch in the direction along the row, and the first semiconductor switch and the second semiconductor switch are electrically connected via the connecting conductor plate. ,
The capacitor circuit unit includes a laminated conductor plate for supplying DC power, a power supply terminal for receiving DC power from a DC power source, and a plurality of capacitors, each of the laminated conductor plates being A power converter comprising a DC power supply terminal for supplying DC power to a power module unit, wherein the plurality of capacitors are connected between the DC power supply terminal and the power supply terminal. The power conversion device according to claim 1,
A horizontal electric circuit is formed between the first semiconductor switch and the connecting conductor plate, and an electric circuit in a direction along a second row is formed on the connecting conductor plate. The power converter according to claim 1, wherein the connecting conductor plate is connected to the second semiconductor switch through an electric circuit extending along the direction. The power converter according to claim 1 or 2, wherein:
The power converter according to claim 1, wherein the plurality of capacitors are connected to and held by the conductive plates arranged in a stacked manner. In the power converter according to any one of claims 1 to 3,
The laminated conductor plate is formed at an end of the laminated conductor plate, the DC power supply terminal of the laminated conductor plate is formed integrally with the laminated conductor plate, and the DC power supply terminal of the power module unit The power conversion device is directly connected to the positive DC terminal and the negative DC terminal. In the power converter according to one of claims 1 to 4,
A horizontal electric circuit is provided between the first semiconductor switch provided in the power module section and the connecting conductor plate, and an electric circuit in the column direction is formed on the connecting conductor plate, 1 semiconductor switch and the connecting conductor plate are connected via the electric circuit in the left-right direction, and the connection between the connecting conductor plate and the first semiconductor switch is in the row direction formed on the connecting conductor plate. A power conversion device characterized by being performed via an electric circuit. The power conversion device according to claim 5,
The power converter according to claim 1, wherein the left-right electrical circuit for connecting the first semiconductor switch and the connecting conductor plate is wire bonding arranged in the left-right direction.

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