Breaker

Abstract

To suppress the temperature rise of a blocking device to improve operational reliability.SOLUTION: A blocking device 1 includes a radiator 2, a substrate 3, a first charging relay 4 arranged in a first heat transfer portion 18, a second charging relay 5 arranged in a second heat transfer portion 19, a first discharge relay 6 arranged in a third heat transfer portion, a second discharge relay 7 arranged in a fourth heat transfer portion 21, a first storage terminal 12, and a second storage terminal 13. The first discharge relay 6 and the second discharge relay 7 are arranged closer to the first storage terminal 12 and the second storage terminal 13 than the first charging relay 4 and the second charging relay 5. The first heat transfer portion 18, the second heat transfer portion 19, the third heat transfer portion 20, and a fifth heat transfer portion 22 are arranged in a row in a first direction. The fourth heat transfer portion 21 and the fifth heat transfer portion 22 are arranged in a row in a second direction perpendicular to the first direction. The radiator 2 has higher heat dissipation performance for the third heat transfer portion 20, the fourth heat transfer portion 21, and the fifth heat transfer portion 22 than the heat dissipation performance for the first heat transfer portion 18 and the second heat transfer portion 19.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a circuit breaker used in various types of vehicle electrical equipment. [Background technology]

[0002] A conventional circuit breaker is described below. The conventional circuit breaker includes a base, a plurality of relays fixed to the base, and a protection device for protecting the relays and devices connected to the relays when an overcurrent flows through the relays. The multiple relays are spaced far apart from each other to suppress temperature rise in the relays and the protection device.

[0003] As prior art document information related to the invention of this application, for example, Patent Document 1 is known. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 100612 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional circuit breaker devices, if multiple relays are arranged at a large distance from each other with the priority given to suppressing temperature rise, the circuit breaker device becomes larger, while if multiple relays are arranged at a small distance from each other, the temperature of the relays is likely to rise during operation, which may result in a decrease in the operational reliability of the circuit breaker device.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to improve the operational reliability of a circuit breaker while preventing the circuit breaker from becoming large. [Means for solving the problem]

[0007] In order to achieve this object, the present invention provides a heat sink, a substrate having at least a first edge, a second edge, a third edge, and a fourth edge, and having a first heat transfer portion, a second heat transfer portion, a third heat transfer portion, a fourth heat transfer portion, and a fifth heat transfer portion provided in contact with a first surface of the heat sink, and a first charging relay arranged in contact with the first heat transfer portion, a second charging relay arranged in contact with the second heat transfer portion, a third discharge relay arranged in contact with the first heat transfer portion, and a second discharge relay arranged in contact with the fourth heat transfer portion, on a surface of the substrate opposite to a contact surface with the first surface, a first charging terminal and a second charging terminal drawn out from the first edge, a first output terminal and a second output terminal drawn out from the second edge opposite the first edge and thermally coupled to the fifth heat transfer portion, the first discharge relay and the second discharge relay are arranged closer to the first storage end and the second storage end than the first charging relay and the second charging relay; the first heat transfer portion, the second heat transfer portion, the third heat transfer portion, and the fifth heat transfer portion are arranged in a row in a first direction in which the first edge portion and the second edge portion face each other; the fourth heat transfer portion and the fifth heat transfer portion are arranged in a row in a second direction perpendicular to the first direction; and the heat dissipation performance of the heat sink for the third heat transfer portion, the fourth heat transfer portion, and the fifth heat transfer portion is higher than the heat dissipation performance for the first heat transfer portion and the second heat transfer portion. Effect of the Invention

[0008] According to the present invention, in discharge paths through which particularly large currents flow, the distance between the discharge side relay and the storage element side is reduced, thereby reducing the DC resistance of the conductor, and the heat dissipation efficiency of the discharge path through which heat is likely to be generated is improved, thereby suppressing the temperature rise of the circuit breaker, thereby improving the operational reliability of the entire circuit breaker. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic top view showing a configuration of a cutoff device according to an embodiment of the present invention. [Diagram 2]FIG. 1 is a first schematic side view showing a configuration of a blocking device according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a second schematic side view showing the configuration of the cutoff device according to the embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] (Embodiment) FIG. 1 is a schematic top view showing the configuration of an interrupter 1 in an embodiment of the present invention, and FIG. 2 is a first schematic side view showing the configuration of an interrupter 1 in an embodiment of the present invention.

[0012] The circuit breaker 1 includes a heat sink 2, a substrate 3, a first charging relay 4, a second charging relay 5, a first discharging relay 6, a second discharging relay 7, a first charging end 8, a second charging end 9, a first output end 10, a second output end 11, a first storage end 12, and a second storage end 13.

[0013] The substrate 3 is provided on the first surface 2A side of the heat sink 2. The substrate 3 has at least a first edge 14, a second edge 15, a third edge 16, and a fourth edge 17. The substrate 3 further has a first heat transfer portion 18, a second heat transfer portion 19, a third heat transfer portion 20, a fourth heat transfer portion 21, and a fifth heat transfer portion 22, and the first heat transfer portion 18, the second heat transfer portion 19, the third heat transfer portion 20, the fourth heat transfer portion 21, and the fifth heat transfer portion 22 are in contact with the heat sink 2.

[0014] The first charging relay 4 is arranged in contact with first heat transfer section 18 on the surface of the substrate 3 opposite to the surface in contact with first surface 2A of heat sink 2. The second charging relay 5 is arranged in contact with second heat transfer section 19 on the surface of the substrate 3 opposite to the surface in contact with first surface 2A of heat sink 2. The first discharge relay 6 is arranged in contact with third heat transfer section 20 on the surface of the substrate 3 opposite to the surface in contact with first surface 2A of heat sink 2. The second discharge relay 7 is arranged in contact with fourth heat transfer section 21 on the surface of the substrate 3 opposite to the surface in contact with first surface 2A of heat sink 2.

[0015] The first charging end 8 and the second charging end 9 are drawn out from a first edge portion 14. The first output end 10 and the second output end 11 are drawn out from a second edge portion 15. The second edge portion 15 is an edge portion provided at a position opposite to the first edge portion 14. In addition, the first output end 10 is thermally coupled to a fifth heat transfer portion 22.

[0016] The first storage terminal 12 and the second storage terminal 13 are drawn out from the third edge portion 16 or the fourth edge portion 17. The first storage terminal 12 is connected to a first pole 23A of the storage element 23, and the second storage terminal 13 is connected to a second pole 23B of the storage element 23.

[0017] Here, the first discharge relay 6 and the second discharge relay 7 are arranged closer to the first storage end 12 and the second storage end 13 than the first charging relay 4 and the second charging relay 5. Furthermore, the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, and the fifth heat transfer section 22 are arranged in a row in a first direction in which the first edge section 14 and the second edge section 15 face each other. Furthermore, the fourth heat transfer section 21 and the fifth heat transfer section 22 are arranged in a row in a second direction perpendicular to the first direction. Furthermore, the heat sink 2 has a higher heat dissipation performance for the third heat transfer section 20, the fourth heat transfer section 21, and the fifth heat transfer section 22 than for the first heat transfer section 18 and the second heat transfer section 19.

[0018] With the above configuration, the first discharge relay 6 and the second discharge relay 7, which correspond to the discharge path from the storage element 23, through which a particularly large current flows, to the first output terminal 10 and the second output terminal 11, reduce the distance between the first pole 23A and the second pole 23B of the storage element 23, thereby reducing the DC resistance of the conductor and suppressing heat generation. Furthermore, the first discharge relay 6, the second discharge relay 7, and the first output terminal 10, which are discharge paths that are prone to heat generation, can suppress a temperature rise in the circuit breaker 1 by improving the heat dissipation efficiency of the heat sink 2 that is thermally coupled to them, and as a result, the operational reliability of the entire circuit breaker can be improved.

[0019] The details of the configuration of the interrupter 1 will be described below with reference to Figs. 1 and 2, and the second schematic side view of Fig. 2 showing the configuration of the interrupter 1 in the embodiment of the present invention.

[0020] As described above, the circuit breaker 1 includes a heat sink 2, a substrate 3, a first charging relay 4, a second charging relay 5, a first discharging relay 6, a second discharging relay 7, a first charging terminal 8, a second charging terminal 9, a first output terminal 10, a second output terminal 11, a first storage terminal 12, and a second storage terminal 13.

[0021] The substrate 3 is made of resin in a generally plate shape or a plate shape having a frame. The substrate 3 is provided such that a first surface 3A of the substrate 3 contacts and faces a first surface 2A of the heat sink 2. A first charging relay 4, a second charging relay 5, a first discharging relay 6, and a second discharging relay 7 are arranged on a second surface 3B of the substrate 3 opposite to the first surface 3A.

[0022] A first heat transfer section 18, a second heat transfer section 19, a third heat transfer section 20 and a fourth heat transfer section 21 are provided to efficiently transfer heat generated in the first charging relay 4, the second charging relay 5, the first discharge relay 6 and the second discharge relay 7 to the heat sink 2, and to maintain electrical insulation between the heat sink 2 and the first charging relay 4, the second charging relay 5, the first discharge relay 6 and the second discharge relay 7.

[0023] The first heat transfer portion 18 is provided between the first charging relay 4 and the heat sink 2 in contact with both, the second heat transfer portion 19 is provided between the second charging relay 5 and the heat sink 2 in contact with both, the third heat transfer portion 20 is provided between the first discharge relay 6 and the heat sink 2 in contact with both, and the fourth heat transfer portion 21 is provided between the second discharge relay 7 and the heat sink 2 in contact with both. Here, the first discharge relay 6 is connected to the first output terminal 10, and a fifth heat transfer portion 22 is provided between the conductor constituting the first output terminal 10 and the heat sink 2 in contact with both.

[0024] 1 to 3 do not show the electrical connection state of each element, but for example, assuming that first pole 23A of storage element 23 is a positive pole and second pole 23B is a negative pole, first pole 23A of storage element 23 mounted on a vehicle (not shown) is connected to first charging terminal 8 via first charging relay 4. Also, second pole 23B of storage element 23 is connected to second charging terminal 9 via second charging relay 5. First charging terminal 8 and second charging terminal 9 are connected to a power supply device (not shown) provided outside the vehicle (not shown) on which circuit breaker 1 is mounted.

[0025] Further, the first pole 23A of the storage element 23 is connected to the first output terminal 10 via the first discharge relay 6. Further, the second pole 23B of the storage element 23 is connected to the second output terminal 11 via the second discharge relay 7. The first output terminal 10 and the second output terminal 11 are connected to a drive propulsion device (not shown) mounted on a vehicle (not shown) on which the circuit breaker 1 is mounted. Here, the drive propulsion device (not shown) is configured to include a DC / AC conversion circuit, a motor, etc.

[0026] Generally, a current flows through the first discharge relay 6 and the second discharge relay 7 when the vehicle (not shown) is driven for propulsion. Therefore, a large output current flows through the first discharge relay 6 and the second discharge relay 7, and the value of this output current frequently becomes larger than the charging current flowing through the first charging relay 4 and the second charging relay 5 during the charging operation of the storage element 23. Therefore, heat is likely to be generated due to DC resistance in the first discharge relay 6 and the second discharge relay 7 and in the conductors connected to the first discharge relay 6 and the second discharge relay 7.

[0027] Therefore, in this embodiment, in particular, in order to suppress the DC resistance of the conductor connected to the first discharge relay 6 and the second discharge relay 7, and the first discharge relay 6 and the second discharge relay 7, the first discharge relay 6 and the second discharge relay 7 are arranged closer to the first storage terminal 12 and the second storage terminal 13 than the first charging relay 4 and the second charging relay 5. In other words, assuming that the cross-sectional area of ​​the conductor is the same, the conductor length and DC resistance from the first pole 23A of the storage element 23 to the first output terminal 10 via the first discharge relay 6, and the conductor length and DC resistance from the second pole 23B to the second output terminal 11 via the second discharge relay 7 are shorter and smaller than the conductor length and DC resistance from the first pole 23A of the storage element 23 to the first charging terminal 8 via the first charging relay 4, and the conductor length and DC resistance from the second pole 23B to the second charging terminal 9 via the second charging relay 5. In addition, the above-mentioned shortening of the conductor length and suppression of the resistance value are effective when the following two points are satisfied. Furthermore, the resistance value may be suppressed not only by the length of the conductor but also by increasing the cross-sectional area or by the size of the cross-sectional area.

[0028] First, the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, and the fifth heat transfer section 22 are arranged in a row in a first direction in which the first edge section 14 and the second edge section 15 face each other. Second, the fourth heat transfer section 21 and the fifth heat transfer section 22 are arranged in a row in a second direction perpendicular to the first direction. This makes it easy to position the first storage terminal 12 and the second storage terminal 13 at a short distance from the first discharge relay 6 and the second discharge relay 7.

[0029] As a result, the first storage terminal 12 and the second storage terminal 13 are provided at an edge other than the first edge 14 or the second edge 15, so that the above-mentioned configuration of shortening the length of the conductor and suppressing the resistance value can be easily achieved. Here, the substrate 3 is desirably L-shaped having six edges as shown in FIG. 1. The first storage terminal 12 and the second storage terminal 13 are preferably provided in an area facing the two edges of the third edge 16 and the fifth edge 25, and at a position close to a bent portion of the L shape corresponding to the connection point B of the two edges of the third edge 16 and the fifth edge 25. In other words, the first storage terminal 12 and the second storage terminal 13 are preferably provided at a recessed position of the L-shaped substrate 3, and the first discharge relay 6 is preferably located on one side of a straight line connecting the first storage terminal 12 or the second storage terminal 13 and the connection point B, and the second discharge relay 7 is preferably located on the other side of the straight line.

[0030] Furthermore, in this embodiment, the heat dissipation section 2X of the heat sink 2 that comes into contact with the first discharge relay 6 and the second discharge relay 7, which are prone to large temperature increases as described above, is made to have a higher heat dissipation capacity than the heat dissipation section 2Y of the heat sink 2 that comes into contact with the first charging relay 4 and the second charging relay 5 so that the cooling efficiency of the first discharge relay 6 and the second discharge relay 7 is higher than that of the heat dissipation section 2Y of the heat sink 2 that comes into contact with the first charging relay 4 and the second charging relay 5. In addition, in order to further increase the heat dissipation efficiency of the heat dissipation section 2X of the heat sink 2 that comes into contact with the first discharge relay 6 and the second discharge relay 7, the conductor constituting the first output terminal 10 and the heat dissipation section 2X are configured to be in contact with each other via the fifth heat transfer section 22. This increases the thermal coupling between the conductor constituting the first output terminal 10 and the heat dissipation section 2X, improving the heat dissipation efficiency of the heat dissipation section 2X.

[0031] Here, the heat dissipation section 2X and the heat dissipation section 2Y of the heat dissipation section 2 may be integrally formed, or the heat dissipation section 2X and the heat dissipation section 2Y may be provided separately. Alternatively, as shown in Fig. 3, the heat dissipation section 2 may have a structure having a flow path 2Z through which a fluid can pass. In this case, the flow rate of the fluid per unit time in the heat dissipation section 2X in the region facing the first discharge relay 6 and the second discharge relay 7 may be set to a value larger than that of the heat dissipation section 2Y, or the heat dissipation section 2X may be located in an upstream flow path through which a fluid with a lower temperature tends to flow more easily than that of the heat dissipation section 2Y, so that the heat dissipation section 2X has a greater cooling effect than the heat dissipation section 2Y.

[0032] As described above, the first discharge relay 6 and the second discharge relay 7, which correspond to the discharge path from the storage element 23, through which a particularly large current flows, to the first output terminal 10 and the second output terminal 11, have a small distance from the first pole 23A and the second pole 23B of the storage element 23, thereby reducing the DC resistance of the conductor and suppressing heat generation. Furthermore, the first discharge relay 6, the second discharge relay 7, and the first output terminal 10, which are discharge paths that are prone to heat generation, can suppress a temperature rise in the circuit breaker 1 by improving the heat dissipation efficiency of the heat sink 2 that is thermally coupled to them, and as a result, the operational reliability of the entire circuit breaker can be improved.

[0033] In the above-described embodiment, the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, the fourth heat transfer section 21, and the fifth heat transfer section 22 are provided separately, but the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, the fourth heat transfer section 21, and the fifth heat transfer section 22 may be provided as a single layered heat transfer section (not shown). Furthermore, an insulating layer 24 may be provided between the heat sink 2 and the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, the fourth heat transfer section 21, and the fifth heat transfer section 22. This makes it possible to improve the insulation between the heat sink 2 and the multiple relays, and between the heat sink 2 and the conductors connected to the multiple relays, while maintaining the heat transfer characteristics.

[0034] In the above-described embodiment, the first heat transfer section 18, the second heat transfer section 19, the third heat transfer section 20, and the fifth heat transfer section 22 are arranged in a row in the first direction, and the fourth heat transfer section 21 and the fifth heat transfer section 22 are arranged in a row in the second direction. However, these need not be completely linear rows, and may be arranged in a roughly linear row. Furthermore, in the above-described embodiment, the first direction and the second direction are described as directions intersecting perpendicularly, but they do not need to be completely 90°, and may be directions intersecting roughly perpendicularly. In other words, the first direction and the second direction may intersect, and the target devices may be arranged side by side in the first direction and the second direction, so that the area corresponding to the heat dissipation section 2X having a high heat dissipation capacity and the area corresponding to the heat dissipation section 2Y having a lower heat dissipation capacity than the heat dissipation section 2X are clearly defined.

[0035] In addition, the second charging relay 5 and the first discharge relay 6, which are arranged at adjacent positions, may be connected to the same polarity of the storage element 23. As a result, the second charging relay 5 and the first discharge relay 6 have approximately the same potential, which makes it easy to ensure insulation and improves the reliability of the circuit breaker 1. In addition, since the second charging relay 5 and the first discharge relay 6 have approximately the same potential, it is possible to provide a heat sink (not shown) common to both the second charging relay 5 and the first discharge relay 6, and the heat dissipation of the second charging relay 5 and the first discharge relay 6 is improved, which makes it possible to improve the reliability of the circuit breaker 1. Here, the heat sink (not shown) may be provided in a state where it is thermally coupled to the heat sink 2. For example, the heat sink (not shown) may be arranged between the substrate 3 and the heat sink 2 and electrically insulated from the heat sink 2. [Industrial Applicability]

[0036] The circuit breaker of the present invention has the effect of improving operational reliability, and is useful in various types of on-board electrical equipment. [Explanation of symbols]

[0037] 1. Circuit Breaker 2 Heat sink 3. Substrate 4. 1st charging relay 5 Second charging relay 6. First discharge relay 7 Second discharge relay 8 1st charging end 9 2nd charging end 10 First output terminal 11 Second output terminal 12 First storage terminal 13 Second storage terminal 14 First edge 15 Second edge 16 Third edge 17 Fourth edge 18 First heat transfer section 19 Second heat transfer section 20 Third heat transfer section 21 Fourth heat transfer section 22 5th heat transfer section 23 Energy storage element 24 Insulating layer 25 5th edge

Claims

[Claim 1] A heat sink; a substrate having at least a first edge, a second edge, a third edge, and a fourth edge, and having a first heat transfer portion, a second heat transfer portion, a third heat transfer portion, a fourth heat transfer portion, and a fifth heat transfer portion provided in contact with a first surface of the heat sink; a first charging relay arranged in contact with a first heat transfer portion, a second charging relay arranged in contact with a second heat transfer portion, a first discharge relay arranged in contact with a third heat transfer portion, and a second discharge relay arranged in contact with a fourth heat transfer portion, on a surface of the substrate opposite to a contact surface with the first surface; a first charging end and a second charging end extending from the first edge; a first output terminal and a second output terminal that are led out from the second edge portion opposite to the first edge portion and are thermally coupled to the fifth heat transfer portion; a first storage end that is drawn out from the third edge portion or the fourth edge portion and is connected to a first pole of a storage element, and a second storage end that is connected to a second pole of the storage element; Equipped with the first discharge relay and the second discharge relay are disposed closer to the first storage end and the second storage end than the first charging relay and the second charging relay; the first heat transfer portion, the second heat transfer portion, the third heat transfer portion, and the fifth heat transfer portion are arranged in a row in a first direction in which the first edge portion and the second edge portion face each other; The fourth heat transfer portion and the fifth heat transfer portion are arranged in a row in a second direction perpendicular to the first direction, the heat radiator has a higher heat dissipation performance for the third heat transfer portion, the fourth heat transfer portion, and the fifth heat transfer portion than the heat dissipation performance for the first heat transfer portion and the second heat transfer portion; Shut-off device.

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