Connector arrangement structure of power converter, power converter

Abstract

The noise immunity is improved by shortening the cable length connecting the two connectors. [Solution] The control board 5 is mounted on top of the power module 2. A busbar 6, which connects to the power module 2, is inserted into a hole in the board 4 of the current sensor 4. The connector 5a of the control board 5 is positioned above (towards the U) the connector 4a of the board 4. The connector 5a of the board 5 is positioned so that it can be connected to the connector 10a of the cable 10 from the side, as shown by arrow Q. The connector 4a of the board 4 is positioned so that it can be connected to the connector 10b of the cable 10 from above, as shown by arrow S. In addition, in the width direction of the control board 5, the connector 5a is positioned offset from the connector 4a of the board 4.

Description

Technical Field

[0001] The present invention relates to an arrangement structure of a connector for communicating a signal from a current sensor of a power conversion device to a control board, and a power conversion device provided with the arrangement structure.

Background Art

[0002] In an inverter device that converts a DC voltage into an AC voltage using a semiconductor switching element such as an IGBT and supplies power to a load such as a motor, the inverter AC output current is often measured and used for control of the inverter device.

[0003] As such a technique, Patent Document 1 is known, in which a current sensor and a control circuit board are connected by a signal cable. Here, the control circuit board generates an on / off command for the IGBT based on the current detection value received from the current sensor and performs the switching operation of the IGBT.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, both the connector of the current sensor connected to the signal cable and the connector of the control circuit board face the same direction (horizontal direction). Therefore, the cable length for routing the signal cable becomes long, and electromagnetic noise generated by the switching of the IGBT is superimposed on the cable signal, which may cause malfunction.

[0006] The present invention is made to solve such a conventional problem, and aims to improve the noise resistance by shortening the cable length connecting between the two connectors as a problem to be solved.

Means for Solving the Problems

[0007] (1) One aspect of the present invention comprises a power module, a control board, and a current sensor, A connector arrangement structure for a power converter that transmits signals from the current sensor to the control board, The control board is mounted on top of the power module. The cable connects the connector of the control board and the connector of the current sensor board. A busbar connected to the power module is inserted into the hole of the current sensor. The connector of the control board is positioned above the connector of the current sensor board in the vertical direction of the power module. The connector on the current sensor's circuit board is positioned so that the cable can be connected from the top and bottom directions, The connector on the control board is characterized in that it is arranged so that the cable can be connected from a lateral direction perpendicular to the vertical direction.

[0008] (2) Another aspect of the present invention comprises a power module, a control board, and a current sensor, A connector arrangement structure for a power converter that transmits signals from the current sensor to the control board, The control board is mounted on the side of the power module. The cable connects the connector of the control board and the connector of the current sensor board. A busbar connected to the power module is inserted into the hole of the current sensor. The connector of the control board is positioned above the connector of the current sensor board in the vertical direction of the power module. The connector on the current sensor's circuit board is positioned so that the cable can be connected from the side, The connector of the control board is characterized in that it is arranged so that the cable can be connected from a lateral direction perpendicular to the lateral direction.

[0009] Each of the above embodiments is in the left-right direction of the control board, The connector of the control board may be positioned offset from the connector of the current sensor board. [Effects of the Invention]

[0010] According to the present invention, noise immunity can be improved by shortening the cable length connecting the two connectors. [Brief explanation of the drawing]

[0011] [Figure 1] A side view showing the current sensor board and control board of a power conversion device according to an embodiment of the present invention connected by a cable. [Figure 2] Figure 1 is a plan view showing the connector arrangement structure of the current sensor board and the control board. [Modes for carrying out the invention]

[0012] The following describes the connector arrangement structure for the current sensor of a power conversion device according to an embodiment of the present invention. This connector arrangement structure is mainly used in inverter devices for vehicle drive systems such as electric vehicles and hybrid vehicles, and effectively utilizes the space inside the housing by arranging the connectors that transmit signals from the current sensor to the control board in a three-dimensional manner. [Examples]

[0013] In Figures 1 and 2, 1 shows an embodiment of the connector arrangement structure. In this embodiment, the connector arrangement structure is located inside the housing of the inverter device.

[0014] (1) Example configuration This embodiment includes a power module 2 equipped with an IGBT (a transistor of a power semiconductor device), a current sensor 3 for measuring the inverter AC output current, a substrate of the current sensor 3 (current sensor substrate) 4, and a control substrate 5 that generates an on / off command for the IGBT based on the current detection value received from the current sensor 3 and causes the IGBT to perform a switching operation. The current sensor substrate 4 and the control substrate 5 are connected by a cable 10 (see FIG. 1). As shown in FIGS. 1 and 2, the power module 2 has a flat, substantially rectangular parallelepiped shape. Further, in this specification, the direction of the surface with the terminal 2a is defined as the upward direction (the direction of arrow U in FIG. 2). Note that the vertical direction (arrow U, D direction) of the power module 2 and the vertical direction within the housing do not necessarily have to coincide.

[0015] Here, the power module 2 and the current sensor 3 are arranged opposite to each other, and the control substrate 5 is arranged above the power module 2. A three-phase bus bar 6 for connecting to a load (such as a motor) is connected to the terminal 2a of the power module 2. This bus bar 6 extends in the direction of the current sensor substrate 4 and is inserted through a hole portion (not shown) of the current sensor 3.

[0016] Thereby, the sensor IC 3a of the current sensor 3 can detect the inverter AC output current from the magnetic flux of the bus bar 6. Here, the current sensor substrate 4 is arranged at a position inclined 90 degrees from the control substrate 5, and both substrates 4 and 5 are provided with connectors 4a and 5a for cable connection.

[0017] At this time, the connector 5a is arranged at position A in FIG. 2, while the connector 4a is arranged at position B in the same figure. That is, as shown in FIG. 2, in the vertical direction (arrow U, D direction) of the power module 2, the connector 5a is arranged above (arrow U side) the connector 4a.

[0018] In this sense, connector 5a is located further away from power module 2 in the upward direction (arrow U direction) than connector 4a. Here, the connector pins of connector 4a face upward (arrow U direction), while the connector pins of connector 5a face lateral (arrow P direction), which is perpendicular to the upward direction.

[0019] Furthermore, in the width direction of the control board 5 (the left-right direction of the power module 2: the directions of arrows R and L in Figure 1), both connectors 4a and 5a are offset so as not to overlap. In addition, although the current sensor board 4 is exposed to the outside in Figure 1, it is not limited to this configuration, and a configuration in which only the connector 4a is exposed from the case of the current sensor 3 is also acceptable.

[0020] (2) Connection status of cable 10 Based on Figure 2, the state in which the current sensor board 4 and the control board 5 are connected by cable 10 is explained. Here, one connector 10a of cable 10 is connected to connector 5a, and the other connector 10b is connected to connector 4a. This makes it possible to communicate the current value flowing through the busbar 6 to the control board 5, and the control of the inverter device using the detected current value is executed.

[0021] In this embodiment, as described above, connector 5a is located at position A in Figure 2, while connector 4a is located at position B in the same figure. That is, the positional relationship between the two boards 4 and 5 is determined such that the connector position (position A) of the control board 5 is located above the connector position (position B) of the current sensor board 4 in the vertical direction of the power module 2.

[0022] According to this positional relationship, connectors 10a and 10b of cable 10 can be inserted into connectors 5a and 4a from both the vertical and horizontal directions, as shown by arrows Q and S. Specifically, as shown by arrow S, connector 10b is inserted into connector 4a from above (U direction) to connect them, thereby electrically connecting the pins of both connectors. Also, as shown by arrow Q, connector 10a of cable 10 is inserted into connector 5a from the horizontal directions, front and back, to connect them, thereby electrically connecting the pins of both connectors.

[0023] This allows for a shorter routing distance (cable length) for cable 10, thereby improving noise immunity. Additionally, the connectors 10a and 10b of cable 10 become easier to plug and unplug, improving ease of assembly.

[0024] Furthermore, since connectors 4a and 5a are positioned so that they do not overlap in the left-right direction in Figure 1, the space for inserting and removing connector 4a is increased, making the work easier and improving work efficiency.

[0025] It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with modifications within the scope of each claim. For example, if the control board 5 is provided on the side of the power module 2 in the left-right direction (arrows R and L directions) rather than on the top, the connector 5a will be arranged on the same side of the power module 2.

[0026] In this case, in the vertical direction (arrows U and D) of the power module 2, connector 5a is positioned above connector 4a (towards arrow U), and connector 5a is positioned so that its connector pins face the direction of arrow P, with both connectors 4a and 5a offset from each other in the left-right direction (arrows R and L).

[0027] This allows the connectors 10a and 10b of cable 10 to be inserted into connectors 5a and 4a from both the left-right and front-back lateral directions, respectively. In other words, connector 10b can be inserted into connector 4a from above the power module 2 to connect it, and connector 10a can be inserted into and connected from the front-back lateral direction (direction of arrow Q), achieving the same effect as in the embodiment.

[0028] Furthermore, the present invention is not limited to inverter devices, but can be applied to power conversion devices in general that include a power module 2, a current sensor 3, and a control board 5. [Explanation of Symbols]

[0029] 2…Power Module 2a…Terminal 3…Current sensor 4…Current sensor circuit board 4a, 5a… connectors 5…Control board 6... Busba 10… Cable

Claims

1. It comprises a power module, a control board, and a current sensor. A connector arrangement structure for a power converter that transmits signals from the current sensor to the control board, The control board is mounted on top of the power module. The cable connects the connector of the control board and the connector of the current sensor board. A busbar connected to the power module is inserted into the hole of the current sensor. The connector of the control board is positioned above the connector of the current sensor board in the vertical direction of the power module. The connector on the current sensor's circuit board is positioned so that the cable can be connected from the top and bottom directions, The connector on the control board is positioned to allow connection of the cable from a lateral direction perpendicular to the vertical direction. A connector arrangement structure for a power conversion device characterized by the following features.

2. It comprises a power module, a control board, and a current sensor. A connector arrangement structure for a power converter that transmits signals from the current sensor to the control board, The control board is mounted on the side of the power module. The cable connects the connector of the control board and the connector of the current sensor board. A busbar connected to the power module is inserted into the hole of the current sensor. The connector of the control board is positioned above the connector of the current sensor board in the vertical direction of the power module. The connector on the current sensor's circuit board is positioned so that the cable can be connected from the side, The connector on the control board is positioned so that the cable can be connected from a lateral direction perpendicular to the lateral direction. A connector arrangement structure for a power conversion device characterized by the following features.

3. In the left-right direction of the control board, The connector of the control board is positioned offset from the connector of the current sensor board. The connector arrangement structure for a power converter according to claim 1 or 2, characterized in that it is the same as described in claim 1 or 2.

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