Electronic device

Abstract

To provide an electronic device that ensures insulation and is compact.SOLUTION: An electronic device includes: a case; a cover fastened to the case; a circuit board equipped with a protection circuit; and a positioning pin passing through a through hole in the circuit board and inserted into a pin hole provided on the cover. The cover has: a receiving portion provided with the pin hole formed corresponding to a position where the positioning pin is to be arranged; and a rib connecting the receiving portion to an outer edge of the cover.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to electronic devices. [Background technology]

[0002] If the discharge circuit inside the inverter of a vehicle is destroyed by impact or other factors during a vehicle collision, there is a risk of electric shock to passengers due to residual charge. To avoid this, the discharge circuit must be protected. One method for protecting the discharge circuit is to suppress deformation of the housing around the control board that contains the discharge circuit components. For example, Patent Document 1 listed below discloses a configuration in which pillars are placed below areas of the housing that are subject to large deformation, suppressing vertical deformation of the housing that accommodates the control board and preventing damage to the control board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-193971 Summary of the Invention [Problem to be solved by the invention]

[0004] The configuration described in Patent Document 1 can suppress deformation of the housing in the vertical direction, but suppression of deformation in the horizontal direction is addressed by thickening the housing, etc., which poses the problem of the device becoming heavier and larger. [Means for solving the problem]

[0005] The electronic device comprises a case, a cover fastened to the case, a circuit board equipped with a protection circuit, and a positioning pin that passes through a through hole in the circuit board and is inserted into a pin hole in the cover, and the cover has a receiving portion in which the pin hole is formed corresponding to the position where the positioning pin is to be placed, and a rib connecting the receiving portion to the outer edge of the cover. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide an electronic device that ensures insulation and achieves miniaturization. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is an exploded perspective view of an electronic device according to an embodiment of the present invention; [Figure 2] 1 is an electrical circuit diagram of an electronic device according to an embodiment of the present invention; [Figure 3] 1 is a cross-sectional view of an electronic device according to one embodiment of the present invention. [Figure 4] 1 is a diagram showing the configuration of a circuit board according to an embodiment of the present invention; [Figure 5] Enlarged view of the discharge circuit in Figure 4 DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following description and drawings are examples for explaining the present invention, and some omissions and simplifications have been made as appropriate for clarity of explanation. The present invention can be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

[0009] In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0010] (One embodiment and overall configuration) (Figure 1) The power conversion device 100 is a rectangular electronic device having a cover 1 and a case 10 to which the cover 1 is fastened. The power conversion device 100 is mounted, for example, on a hybrid electric vehicle (HEV) or a battery electric vehicle (BEV). The cover 1 and the case 10 are each formed of a metal such as an aluminum alloy. The internal space formed by the cover 1 and the case 10 accommodates a circuit board 2, a board base 3, a DC bus bar 4, an AC bus bar 5, a smoothing capacitor 6, a power semiconductor module 7, and a discharge resistor 8. The circuit board 2 is mounted with a discharge circuit 13.

[0011] Positioning pins 9 are inserted and fixed to the case 10 to position the circuit board 2 and the board base 3 in the internal space formed by the cover 1 and the case 10 when the cover 1 and the case 10 are assembled. The positioning pins 9 fixed to the case 10 are inserted into pin holes 16a (FIG. 3) in the cover 1 when the cover 1 and the case 10 are assembled. The positioning pins 9 are made of a metal such as stainless steel, and have a higher rigidity than the cover 1 and the case 10.

[0012] (Figure 2) The power conversion device 100 is electrically connected to a high-voltage battery 11 and a motor 15. The high-voltage battery 11 is a DC power supply for an HEV or BEV. The power semiconductor module 7 includes, as a power conversion circuit, a switching element that converts DC power input from the high-voltage battery 11 into AC power, and a diode element that circulates current from the motor 15. The motor 15 outputs driving force based on the AC power input from the power conversion device 100.

[0013] The AC bus bar 5 is a power transmission path that electrically connects the motor 15 and the power semiconductor module 7. The DC bus bar 4 is a power transmission path that electrically connects the high-voltage battery 11 and the power semiconductor module 7.

[0014] The smoothing capacitor 6 is electrically connected between the high-voltage battery 11 and the power semiconductor module 7, and is connected to a power conversion circuit in the power semiconductor module 7 via the DC bus bar 4. The smoothing capacitor 6 smoothes the DC power input from the high-voltage battery 11, and the smoothed DC power is supplied to the power semiconductor module 7.

[0015] The discharge circuit 13 includes a discharge resistor 8 and a control circuit 12. The discharge circuit 13 is electrically connected between the high-voltage battery 11 and the power semiconductor module 7. The discharge circuit 13 is a protection circuit that discharges the charge stored in the smoothing capacitor 6 in the event of a vehicle accident. The power semiconductor module 7 having a power conversion circuit and the smoothing capacitor 6 are provided inside a case 10 (Fig. 1).

[0016] (Figure 3) Fig. 3(a) is an elevational cross-sectional view of the power conversion device 100, and Fig. 3(b) is an enlarged view of A in Fig. 3(a). The cover 1 has a receiving portion 16. The receiving portion 16 is connected to the outer edge of the cover 1 closest to the receiving portion 16 by a rib 18. The receiving portion 16 has a recessed pin hole 16a into which the positioning pin 9 is inserted.

[0017] The pin holes 16a are formed corresponding to the positions where the positioning pins 9 are to be disposed. The diameter of the pin holes 16a is formed larger than the diameter of the positioning pins 9 so that the positioning pins 9 can be inserted into the pin holes 16a and the cover can be maintained in a stably fixed state. This makes it easier to insert the positioning pins 9 into the pin holes 16a when assembling the cover 1 and the case 10, and also enables the fixation of the cover 1 to be maintained.

[0018] When the cover 1 and the case 10 are assembled, the positioning pin 9 fixed to the case 10 passes through the through holes of the circuit board 2 and the board base 3 and is inserted into the first pin hole 16a. The through hole 2a of the circuit board 2, through which the positioning pin 9 passes, has a diameter larger than that of the positioning pin 9 to an extent that the stability of the circuit board 2 can be ensured when the positioning pin 9 passes through the through hole 2a. In this way, when the cover 1 and the case 10 are assembled, the positioning pin 9 can easily pass through the through hole 2a, and the stability of the circuit board 2 can be maintained.

[0019] The strength and rigidity of the material of the positioning pin 9 are greater than the strength and rigidity of the material of the case 10 and the cover 1. Inside the power conversion device 100, the positions at which the receiving portion 16 and the positioning pin 9 are provided are close to the positions at which the discharge circuit component 13a in the discharge circuit 13 (FIG. 1) is provided. In this way, even when an external force is applied to the cover 1 in the vertical or lateral direction, the positioning pin 9 can suppress deformation of the cover 1 and protect the discharge circuit component 13a.

[0020] (Fig. 4, Fig. 5) Fig. 4(a) is an elevation view of the power conversion device 100, and Fig. 4(b) is a cross-sectional view taken along line AA in Fig. 4(a). Fig. 5 is an enlarged view of the area of the discharge circuit 13 in Fig. 4, with the receiving portion 16 removed.

[0021] The circuit board 2 is formed in a rectangular shape, similar to the cover 1 and case 10. When the cover 1 and case 10 are assembled, the positioning pin 9 passes through the through hole 13b, thereby positioning the circuit board 2 in the internal space formed by the cover 1 and case 10. The through hole 13b is formed in an area of the circuit board 2 where the discharge circuit 13 is provided, and is provided in a position close to two adjacent outer edge portions 1a of the cover 1.

[0022] The cover 1 and the case 10 have a plurality of fastening points 17 on their respective outer edge portions 1a. The cover 1 and the case 10 are fastened to each other at the fastening points 17 by using fastening members such as screws 19.

[0023] The receiving portion 16 of the cover 1 is provided in a region on the circuit board 2 where the discharge circuit 13 is provided, at a position between adjacent fastening points 17. It is particularly desirable to provide the receiving portion 16 at a midpoint between adjacent fastening points 17. Note that, in order to improve the strength of the cover 1, the receiving portion 16 and the through hole 13b may be provided in positions between other fastening points 17, not just in the region where the discharge circuit 13 is provided.

[0024] The midpoint between adjacent fastening points 17 is a location where the amount of deformation is relatively large when an external force is applied to the cover 1. However, by placing the receiving portion 16 at this position and inserting the positioning pin 9 into the pin hole 16a (Figure 3) of the receiving portion 16, the high rigidity of the positioning pin 9 can suppress deformation of the cover 1.

[0025] Furthermore, even when a vertical or lateral external force is applied to the outer edge 1a of the cover 1, deformation of the cover 1 can be suppressed because the tip of the pin 9 is inserted into the receiving portion 16, so there is no need to make the cover 1 thicker, and the power conversion device 100 can be made smaller and lighter while protecting the discharge circuit 13.

[0026] The receiving portion 16 is connected to the outer edge portion 1a of the cover 1 that is closest to the receiving portion 16 by a rib 18, and the rib 18 is provided in a position between adjacent fastening points 17 among the multiple fastening points 17 in accordance with the position of the receiving portion 16. This makes it possible to prevent damage to the base portion of the receiving portion 16 formed on the cover 1 even when an external force is applied to the cover 1.

[0027] The discharge circuit 13 is disposed near one of the rectangular corners of the circuit board 2. In plan view, the discharge circuit 13 is disposed in a position facing the outer edge 1a of the cover 1, with the positioning pin 9 and the receiving portion 16 sandwiched therebetween. This suppresses deformation of the portion of the cover 1 surrounding the discharge circuit 13, and ensures an insulation distance when the cover 1 deforms without adding a gap around the discharge circuit 13.

[0028] According to the embodiment of the present invention described above, the following advantageous effects are achieved.

[0029] (1) Electronic device 100 includes case 10, cover 1 fastened to case 10, circuit board 2 on which discharge circuit 13 is mounted, and positioning pin 9 that passes through through hole 2a of circuit board 2 and is inserted into pin hole 16a of cover 1, and cover 1 has receiving portion 16 with pin hole 16a formed corresponding to the position where positioning pin 9 is to be arranged, and rib 18 that connects receiving portion 16 and outer edge portion 1a of cover 1. By doing so, it is possible to provide electronic device 100 that ensures insulation when cover 1 is deformed by external force and achieves miniaturization.

[0030] (2) The outer edge 1a of the cover 1 has a plurality of fastening points 17 for fastening the case 10 and the cover 1 together, and the ribs 18 are formed at positions between adjacent fastening points 17. This configuration can prevent damage to the base of the receiving portion 16.

[0031] (3) The circuit board 2, the case 10, and the cover 1 are each rectangular, the discharge circuit 13 is disposed near one of the corners of the square on the circuit board 2, and the through-holes 2a are formed in the area of the circuit board 2 where the discharge circuit 13 is provided, and are provided in positions near two adjacent outer edge portions 1a of the cover 1. This configuration makes it possible to suppress deformation of the area of the cover 1 around the discharge circuit 13.

[0032] (4) The rigidity of the positioning pin 9 is higher than the rigidity of the case 10 and the cover 1. This makes it possible to suppress deformation of the case 10 and the cover 1.

[0033] (5) The case 10 contains a power conversion circuit that converts DC power and AC power, and a smoothing capacitor 6 that smoothes the DC power input to the power conversion circuit, and a discharge circuit 13 that discharges the charge stored in the smoothing capacitor 6. By protecting these components, electric shock accidents can be prevented.

[0034] The present invention is not limited to the above-described embodiments, and various modifications and combinations of other configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to those having all of the configurations described in the above-described embodiments, and includes those in which some of the configurations are omitted. [Explanation of symbols]

[0035] 1 cover 1a Outer edge 2 Circuit Boards 2a Through hole 3 PCB base 4 DC busbar 5 AC bus bar 6 smoothing capacitors 7 Power Semiconductor Modules 8 Discharge resistor 9 Locating Pins 10 cases 11 High voltage battery 12 Control circuit 13 Discharge circuit 13a Discharge circuit components 15 Motor 16 Receiving part 16a pin hole 17 Fastening Points 18 Ribs 19 screws 100 Power conversion device

Claims

1. Case and a cover fastened to the case; a circuit board equipped with a protection circuit; a positioning pin that passes through the through hole of the circuit board and is inserted into a pin hole of the cover, The cover has a receiving portion in which the pin hole is formed corresponding to the position where the positioning pin is arranged, and a rib connecting the receiving portion and an outer edge portion of the cover. electronic equipment.

2. an outer edge of the cover has a plurality of fastening points for fastening the case and the cover; The rib is formed at a position between adjacent fastening points among the plurality of fastening points. The electronic device of claim 1 .

3. the circuit board, the case, and the cover are each rectangular, the protection circuit is disposed near one of the corners of the square on the circuit board, The through holes are formed in a region of the circuit board where the protection circuit is provided, and are provided at positions close to two adjacent outer edge portions of the cover. The electronic device of claim 1 .

4. The positioning pin has a rigidity higher than that of the case and the cover. The electronic device of claim 1 .

5. The case includes a power conversion circuit that converts DC power and AC power, and a smoothing capacitor that smoothes the DC power input to the power conversion circuit, The protection circuit discharges the charge stored in the smoothing capacitor. The electronic device of claim 1 .

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