JP2018082597A - Electric circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity of an electric circuit device by simplifying a connection process between a high-voltage terminal and a bus bar.SOLUTION: An electric circuit device comprises a first electric circuit component, a second electric circuit component, and a bus bar. The bus bar is electrically connected to the first electric circuit component and the second electric circuit component. The first electric circuit component and the second electric circuit component include a common high-voltage terminal composed of a single member. The common high-voltage terminal is provided with a bent part between the first electric circuit component and the second electric circuit component. The bent part of the common high-voltage terminal is joined to the bus bar.SELECTED DRAWING: Figure 4

Description

  The technology disclosed in the present specification relates to an electric circuit device that transmits a current to an electric circuit component via a bus bar, such as a power conversion device that converts a direct current into an alternating current.

  In recent years, electric circuit devices that convert direct current into alternating current are required to output a large current. In order to output a large current, for example, the electric circuit device disclosed in Patent Document 1 incorporates a plurality of power modules. Each power module includes a plurality of types of high-voltage terminals (DC positive branch terminal, DC negative branch terminal, AC connection terminal), and each high-voltage terminal is connected to a bus bar.

JP, 2014-050118, A

  Conventionally, the connection between the high-voltage terminal and the bus bar has been performed through a process of assembling the high-voltage terminal and the bus bar and then welding the assembly position. Since these steps were performed one by one for the high-voltage terminal, there was a problem that it took time to connect the high-voltage terminal and the bus bar (the number of steps increased). This problem is more conspicuous when a plurality of power modules are built in the electric circuit device as in Patent Document 1, for example. Conventionally, since it is necessary to assemble the high-voltage terminal and the bus bar, there is a problem that the accuracy of the position of the high-voltage terminal in the power module, the position of the assembly portion in the bus bar, and the like is required. The present specification provides a technique for improving the productivity of an electric circuit device by simplifying a connection process between a high-voltage terminal and a bus bar.

  The electric circuit device disclosed in the present specification includes a first electric circuit component, a second electric circuit component, and a bus bar. The bus bar is electrically connected to the first electric circuit component and the second electric circuit component. The first electric circuit component and the second electric circuit component have a common high-voltage terminal formed of a single member, and the first high-voltage terminal includes the first electric circuit component and the second electric circuit. A bent portion is provided between the parts. A bent portion of a common high-voltage terminal is joined to the bus bar.

  In this configuration, two electric circuit components (a first electric circuit component and a second electric circuit component) have a common high voltage terminal formed of a single member, and the common high voltage terminal is joined to the bus bar. Has been. For this reason, two electric circuit components can be simultaneously connected to the bus bar. In other words, in this configuration, the number of man-hours for connection can be halved as compared with the conventional case in which each high-voltage terminal of each electric circuit component is connected to the bus bar. In this configuration, the bent portion of the high-voltage terminal that connects the two electric circuit components is connected to the bus bar. For this reason, compared with the conventional case where the high voltage terminal is connected to the bus bar and then connected, high component accuracy and assembly accuracy are not required. Therefore, according to this configuration, the connection process between the high voltage terminal and the bus bar can be simplified, and the productivity of the electric circuit device can be improved.

  Details and further improvements of the technology disclosed in this specification will be described in the following “DETAILED DESCRIPTION”.

It is a block diagram of a hybrid vehicle. It is a figure which shows the structure of an electric circuit apparatus. It is a figure explaining joining to the bus bar of an electric circuit device. It is a figure explaining joining to the bus bar of an electric circuit device. It is a figure which shows the structure of the electric circuit apparatus as a comparative example. It is a figure explaining joining to the bus bar of the electric circuit device as a comparative example. It is a figure explaining joining to the bus bar of the electric circuit device as a comparative example. It is a figure which shows the structure of the electric circuit apparatus of 2nd Example. It is a figure explaining joining to the bus bar of the electric circuit device of the 2nd example. It is a figure which shows the structure of the electric circuit apparatus of 3rd Example. It is a figure explaining joining to the bus bar of the electric circuit device of the 3rd example.

A. First embodiment:
FIG. 1 is a block diagram of hybrid vehicle 200. With reference to FIG. 1, the structure of the hybrid vehicle 200 carrying the electric circuit apparatus 100 is demonstrated. The hybrid vehicle 200 is an example of a target to which the electric circuit device 100 can be applied, and the application destination of the electric circuit device 100 is not limited.

  The hybrid vehicle 200 includes a motor 8 and an engine 6 as a driving source for traveling. The output torque of the motor 8 and the output torque of the engine 6 are appropriately distributed / synthesized by the power distribution mechanism 7 and output. The power distribution mechanism 7 is connected to the output shaft of the engine 6 and the output shaft of the motor 8. The power transmitted from both output shafts is combined at a predetermined ratio to drive wheels 9 a, 9 b via the differential gear 9. To communicate. The power distribution mechanism 7 may distribute the power transmitted from the output shaft of the engine 6 and transmit it to the output shaft of the motor 8 and the drive wheels 9a and 9b. In this case, the motor 8 functions as a generator. In FIG. 1, only parts necessary for the description of the present specification are shown, and parts not related to the description are not shown.

  The motor 8 is connected to the main battery 2 via the system main relay 3 and the inverter 4. The inverter 4 is a power converter that converts the DC power of the main battery 2 into AC power suitable for driving the motor 8. The DC power of the main battery 2 is converted by the inverter 4, and the converted AC power is supplied to the motor 8. When the motor 8 functions as a generator, the inverter 4 converts AC power generated by the motor 8 into DC power suitable for charging the main battery 2. The AC power generated by the motor 8 is converted into DC power by the inverter 4, and the converted DC power is supplied to the main battery 2. The inverter 4 includes an inverter circuit for realizing mutual conversion between DC power and AC power. The inverter circuit is configured using a plurality of electric circuit devices 100. As will be described later, the electric circuit device 100 is a kind of power semiconductor module and includes a plurality of power semiconductor elements. Since the power semiconductor element generates heat, the inverter 4 includes an inverter cooler (not shown) for cooling the plurality of power semiconductor elements.

  The hybrid vehicle 200 includes a sub battery 12 in addition to the main battery 2. The sub battery 12 is connected to the main battery 2 via the DCDC converter 10. DCDC converter 10 steps down the output voltage of main battery 2 to a voltage suitable for charging sub battery 12. For example, the output voltage of the main battery 2 is 300V, and the output voltage of the sub battery 12 is 12V. The power of the main battery 2 is stepped down to a voltage of 12 V by the DCDC converter 10, and the power after the step-down is supplied to the sub battery 12.

  The sub-battery 12 is connected to a device group (commonly called “auxiliary machine”) that is driven by a voltage (for example, 12 V) lower than the output voltage of the main battery 2. This device group is, for example, a car navigation device or a room lamp. The water pump 14 is driven by the electric power of the sub battery 12. Each unit described above in hybrid vehicle 200 is controlled by a controller (not shown).

  FIG. 2 is a diagram illustrating a configuration of the electric circuit device 100. In FIG. 2, the X axis corresponds to the width direction of the electric circuit device 100, the Y axis corresponds to the height direction of the electric circuit device 100, and the Z axis corresponds to the depth direction of the electric circuit device 100. The electric circuit device 100 includes a first electric circuit component 110, a second electric circuit component 120, a high voltage terminal 130, and a bus bar 142.

  The high-voltage terminal 130 is a general term for high-voltage terminals that are commonly used in the first electric circuit component 110 and the second electric circuit component 120. The high-voltage terminal 130 includes a DC positive electrode branch terminal 132, an AC connection terminal 134, and a DC negative electrode branch terminal 136 that are arranged in parallel with the X-axis direction. The DC positive branch terminal 132 is composed of a single metal member, and extends to the inside of the housing of the first electric circuit component 110 and the inside of the housing of the second electric circuit component 120. And a conductive plate. The DC positive branch terminal 132 is electrically connected to the first electric circuit component 110 via one conductive plate, and is electrically connected to the second electric circuit component 120 via the other conductive plate. The same applies to the AC connection terminal 134 and the DC negative branch terminal 136.

  The first electric circuit component 110 is connected between the main battery 2 and, for example, the U phase of the motor 8 (FIG. 1), and switches the voltage applied to the motor 8. The first electric circuit component 110 includes an IGBT (Insulated Gate Bipolar Transistor) 111, a diode 112, a first signal connection terminal 114, a second signal connection terminal 115, a diode 118, and an IGBT 119. ing.

  The IGBT 111, the diode 112, and the first signal connection terminal 114 are circuit components for the upper arm. The IGBT 111 functions as a switch for turning on / off the current, and the diode 112 commutates the load current. The collector electrode of the IGBT 111 and the cathode electrode of the diode 112 are joined to the conductive plate of the DC positive branch terminal 132 using solder. Further, the emitter electrode of the IGBT 111 and the anode electrode of the diode 112 are joined to the conductive plate of the AC connection terminal 134 using solder. The first signal connection terminal 114 is a terminal for connecting a signal line for a drive signal of the IGBT 111. The first signal connection terminal 114 of this embodiment is disposed on the opposite side of the high voltage terminal 130.

  The IGBT 119, the diode 118, and the second signal connection terminal 115 are circuit components for the lower arm. The IGBT 119 functions as a switch for turning on / off the current, and the diode 118 commutates the load current. The collector electrode of the IGBT 119 and the cathode electrode of the diode 118 are joined to the conductive plate of the AC connection terminal 134 using solder. The emitter electrode of the IGBT 119 and the anode electrode of the diode 118 are joined to the conductive plate of the DC negative branch terminal 136 using solder. The second signal connection terminal 115 is a terminal for connecting a signal line for a drive signal of the IGBT 119. The second signal connection terminal 115 is disposed in parallel with the first signal connection terminal 114.

  The second electric circuit component 120 is connected between the main battery 2 and, for example, the U phase of the motor 8 (FIG. 1), and switches the voltage applied to the motor 8. The second electric circuit component 120 has a configuration similar to that of the first electric circuit component 110. That is, the second electric circuit component 120 includes an IGBT 121, a diode 122, a first signal connection terminal 124, a second signal connection terminal 125, a diode 128, and an IGBT 129. The collector electrode of the IGBT 121 and the cathode electrode of the diode 122 are joined to the conductive plate of the DC positive branch terminal 132. The emitter electrode of the IGBT 121 and the anode electrode of the diode 122 are joined to the conductive plate of the AC connection terminal 134. Further, the collector electrode of the IGBT 129 and the cathode electrode of the diode 128 are joined to the conductive plate of the AC connection terminal 134. The emitter electrode of the IGBT 129 and the anode electrode of the diode 128 are joined to the conductive plate of the DC negative branch terminal 136.

  In the electric circuit device 100 described above, the high voltage terminal 130 is actually bent between the first electric circuit component 110 and the second electric circuit component 120 (see FIGS. 3 and 4). For convenience of explanation, FIG. 2 shows a semi-finished product before the high voltage terminal 130 is bent. In the manufacturing process of the electric circuit device 100, the DC positive electrode branch terminal 132, the AC connection terminal 134, and the DC negative electrode branch terminal 136 are bent on the O axis shown in FIG. In the example of FIG. 2, the O-axis is the center of the first electric circuit component 110 and the second electric circuit component 120 in the Y-axis direction. However, the O-axis can be set at any position as long as the high-voltage terminal 130 can be bent between the first electric circuit component 110 and the second electric circuit component 120.

  3 and 4 are diagrams for explaining the joining of the electric circuit device 100 to the bus bar. FIG. 3 is a diagram of the electric circuit device 100 as viewed from the + Y-axis direction (upward direction). FIG. 4 is a diagram of the electric circuit device 100 as viewed from the −X axis direction (lateral direction). The XYZ axes in FIGS. 3 and 4 correspond to the XYZ axes in FIG. 3 and 4 exemplify the case where two electric circuit devices 100 are joined to a bus bar, the number of electric circuit devices 100 joined to the bus bar is not limited.

  As shown in FIGS. 3 and 4, in each electric circuit device 100, the high voltage terminal 130 is bent until the first electric circuit component 110 and the second electric circuit component 120 face each other. And the bending part ES (FIG. 4) of the direct current | flow positive electrode branch terminal 132 and the 1st bus-bar 142 are welded, and the junction part WE is formed. Thus, the first electric circuit component 110, the second electric circuit component 120, and the first bus bar 142 are electrically connected. Similarly, the bent portion of the AC connection terminal 134 and the second bus bar (not shown), and the DC negative branch terminal 136 and the third bus bar (not shown) are also joined and electrically connected to each other. That is, in the first embodiment, in order to connect the illustrated four electric circuit components to the three bus bars, 2 × 3 = 6 joining processes may be performed.

  As described above, in the configuration of the first embodiment, a common direct current in which two electric circuit components, that is, the first electric circuit component 110 and the second electric circuit component 120 are configured by a single member. It has a positive electrode branch terminal 132 (high voltage terminal), and this DC positive electrode branch terminal 132 is joined to the first bus bar 142. For this reason, two electric circuit components (the first electric circuit component 110 and the second electric circuit component 120) can be simultaneously connected to the first bus bar 142. The same applies to the AC connection terminal 134 joined to the second bus bar and the DC negative branch terminal 136 joined to the third bus bar.

  In the configuration of the first embodiment, the bent portion ES of the DC positive branch terminal 132 (high voltage terminal) connecting the two electric circuit components is joined to the first bus bar 142. For this reason, the positional accuracy of the DC positive branch terminal 132 in the first electrical circuit component 110 and the second electrical circuit component 120 is compared with the case where the DC positive branch terminal 132 is joined to the first bus bar 142 after being assembled. In addition, the positional accuracy of the assembly portion in the first bus bar 142 may not be maintained with high accuracy. The same applies to the AC connection terminal 134 joined to the second bus bar and the DC negative branch terminal 136 joined to the third bus bar.

  As described above, according to the configuration of the first embodiment, the connection process between the high voltage terminal 130 (DC positive branch terminal 132, AC connection terminal 134, DC negative branch terminal 136) and the bus bar (first to third bus bars) is performed. This can be simplified and the productivity of the electric circuit device 100 can be improved.

B. Comparative example:
FIG. 5 is a diagram illustrating a configuration of an electric circuit device 100x as a comparative example. FIG. 6 and FIG. 7 are diagrams illustrating the joining of the electric circuit device 100x as a comparative example to the bus bar. The XYZ axes in FIGS. 5 to 7 correspond to the XYZ axes in FIG.

  The electric circuit device 100x of the comparative example is different from that of the first embodiment in that it is composed of a single electric circuit component (second electric circuit component 120x in the illustrated example) and a point joined to the first bus bar 142x. Is different. The electric circuit device 100x includes a high-voltage terminal 130x including a DC positive branch terminal 132x, an AC connection terminal 134x, and a DC negative branch terminal 136x. Each terminal included in the high-voltage terminal 130x is a single electric circuit component, that is, a terminal used only by the second electric circuit component 120x, and is connected to the first electric circuit component 110 (FIG. 2). It is not shared with. The first bus bar 142x includes a rectangular through hole (FIG. 6) for inserting the DC positive branch terminal 132x and a contact member 149 (FIG. 7) for forming a contact point with the DC positive branch terminal 132x. I have. The contact member 149 is a pair of metal plates extending in the + Y-axis direction from both ends of the through hole of the first bus bar 142. This pair of metal plates has a curved shape so that the distance between both becomes narrower in the + Y-axis direction.

  When joining the electric circuit device 100x to the first bus bar 142x, first, the DC positive branch terminal 132x is assembled to the first bus bar 142x. Specifically, the DC positive branch terminal 132x is inserted into the through hole of the first bus bar 142x, and the DC positive branch terminal 132x is brought into contact with the contact member 149. Thereafter, the contact point between the DC positive electrode branch terminal 132x and the contact member 149 is welded. Thereby, the second electric circuit component 120x of the comparative example and the first bus bar 142x are electrically connected. The AC connection terminal 134x and the second bus bar (not shown), and the DC negative branch terminal 136x and the third bus bar (not shown) are joined in the same procedure. That is, in the comparative example, in order to connect the four electric circuit components shown in the figure to the three bus bars, 4 × 3 = 12 joining processes are required. This is twice the required number of times in the first embodiment.

  As described above, when the high-voltage terminal of the electric circuit component is connected to the bus bar, the man-hour required in the first embodiment is half that of the comparative example. In the first embodiment, since the bent portion of the high-voltage terminal is joined to the bus bar, the assembly work described in the comparative example can be omitted.

C. Second embodiment:
FIG. 8 is a diagram showing the configuration of the electric circuit device 100a of the second embodiment. FIG. 9 is a diagram illustrating the joining of the electric circuit device 100a according to the second embodiment to the bus bar. The XYZ axes in FIGS. 8 and 9 correspond to the XYZ axes in FIG.

  The electric circuit device 100a according to the second embodiment is different from the first embodiment in that a high voltage terminal 130a is provided instead of the high voltage terminal 130. The high voltage terminal 130a includes a DC positive branch terminal 132a, an AC connection terminal 134a, and a DC negative branch terminal 136a. The DC positive branch terminal 132a is bent at two locations of the O1 axis and the O2 axis so that the first electric circuit component 110 and the second electric circuit component 120 face each other (FIG. 8). As a result, as shown in FIG. 9, the bent portion ESa of the DC positive branch terminal 132a includes a first bent portion ES1 bent at the O1 axis, a second bent portion ES2 bent at the O2 axis, and a first bent portion ES1. A plane portion between the portion ES1 and the second bent portion ES2. Similarly, the bent portion of the AC connection terminal 134a and the DC negative electrode branch terminal 136a includes two bent portions and a plane portion therebetween.

  In the second embodiment, the flat portion (FIG. 9) of the bent portion ESa of the DC positive branch terminal 132a and the first bus bar 142 are welded to form the joint portion WE. The same applies to the AC connection terminal 134a and the DC negative branch terminal 136a. That is, in the second embodiment, in order to connect the illustrated four electric circuit components to the three bus bars, 2 × 3 = 6 joining processes may be performed.

  As described above, the electric circuit device 100a according to the second embodiment can achieve the same effects as those of the first embodiment. Furthermore, in the electric circuit device 100a of the second embodiment, since the bent portion ESa of the DC positive branch terminal 132 (high voltage terminal) includes a flat portion, the high voltage terminal can be obtained by joining the flat portion to the first bus bar 142. And the contact area between the bus bar can be increased. The same applies to the AC connection terminal 134 joined to the second bus bar and the DC negative branch terminal 136 joined to the third bus bar. In addition, the joining part WE (FIG. 9) of 2nd Example was made into the same magnitude | size as 1st Example (FIG. 4). However, the joint portion WE of the second embodiment may be larger, and for example, all the portions where the flat portion of the bent portion ESa and the first bus bar 142 are in contact may be joined.

D. Third embodiment:
FIG. 10 is a diagram illustrating a configuration of an electric circuit device 100b according to the third embodiment. FIG. 11 is a diagram for explaining the joining of the electric circuit device 100b of the third embodiment to the bus bar. The XYZ axes in FIGS. 10 and 11 correspond to the XYZ axes in FIG.

  The electric circuit device 100b according to the third embodiment is different from the first embodiment in that the high-voltage terminal 130b is provided instead of the high-voltage terminal 130. The high voltage terminal 130b includes a DC positive branch terminal 132b, an AC connection terminal 134b, and a DC negative branch terminal 136b. The DC positive branch terminal 132b includes a notch 132s and a contact claw 132n. The cut 132s is a cut provided in the DC positive electrode branch terminal 132b at a position located between the first electric circuit component 110 and the second electric circuit component 120 and overlapping the O-axis. In the example of FIG. 10, the notch 132s has a C shape with an opening on the second electric circuit component 120 side. The contact claw 132n is an inner portion of the notch 132s. As a result, as shown in FIG. 11, the bent portion ES of the DC positive branch terminal 132b includes a contact claw 132n formed at a position overlapping the O-axis. Similarly, the bent portions of the AC connection terminal 134b and the DC negative branch terminal 136b include a contact claw 134n and a contact claw 136n.

  In the third embodiment, the contact claw 132n (FIG. 11) of the bent portion ES of the DC positive branch terminal 132b and the first bus bar 142 are welded to form the joint WE. The same applies to the AC connection terminal 134b and the DC negative branch terminal 136b. That is, in the third embodiment, in order to connect the illustrated four electric circuit components to the three bus bars, 2 × 3 = 6 bonding processes may be performed.

  As described above, the electric circuit device 100b according to the third embodiment can achieve the same effects as those of the first embodiment. Further, in the electric circuit device 100b of the third embodiment, since the bent portion ES of the DC positive branch terminal 132 (high voltage terminal) includes the contact claw 132n, by joining the contact claw 132n to the first bus bar 142, The contact area between the high voltage terminal and the bus bar can be increased. Furthermore, since the contact claw 132n is biased in the + Y-axis direction where the first bus bar 142 is located due to its structure, the high-voltage terminal and the bus bar can be more reliably brought into contact with each other. The joint portion WE (FIG. 11) of the third embodiment is the same size as the first embodiment (FIG. 4). However, the joint portion WE of the third embodiment may be larger, and for example, all the portions where the contact claws 132n of the bent portion ES are in contact with the first bus bar 142 may be joined.

  Points to be noted regarding the technology of the embodiment will be described. The IGBTs 111, 119, 121, and 129 described in FIGS. 2 to 11 are merely examples, and various power semiconductor elements can be used. For example, a MOSFET (metal oxide semiconductor field effect transistor) may be used. When the MOSFET is used, the diodes 112, 118, 122, and 128 are not necessary. The number and type of high voltage terminals included in the high voltage terminal 130 can be arbitrarily changed.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

2: Main battery 4: Inverter 6: Engine 7: Power distribution mechanism 8: Motor 9: Differential gear 9a: Drive wheel 10: DCDC converter 12: Sub battery 14: Water pumps 100, 100a, 100b, 100x: Electric circuit device 110 : First electric circuit component 111: IGBT
112: Diode 114: First signal connection terminal 115: Second signal connection terminal 118: Diode 119: IGBT
120, 120x: second electric circuit component 121: IGBT
122: Diode 124: First signal connection terminal 125: Second signal connection terminal 128: Diode 129: IGBT
130, 130a, 130b, 130x: High voltage terminals 132, 132a, 132b, 132x: DC positive branch terminal 132n: Contact claws 134, 134a, 134b, 134x: AC connection terminals 134n: Contact claws 136, 136a, 136b, 136x: DC Negative electrode branch terminal 136n: contact claws 142, 142x: first bus bar 149: contact member 200: hybrid vehicle

Claims (1)

An electrical circuit device,
A first electrical circuit component;
A second electrical circuit component;
A bus bar electrically connected to the first electric circuit component and the second electric circuit component;
The first electric circuit component and the second electric circuit component have a common high-voltage terminal constituted by a single member,
The common high-voltage terminal is provided with a bent portion between the first electric circuit component and the second electric circuit component,
The electric circuit device, wherein the bent portion of the common high-voltage terminal is joined to the bus bar.

Images