JP4844647B2 - Electrical device and switching power supply device - Google Patents

Description

  The present invention relates to an electric device and a switching power supply device including a through-type terminal block and a casing.

  In recent years, there has been an increasing demand for in-vehicle large-sized power supply devices used in hybrid cars, electric vehicles, and the like. In such a large power supply device, since a large current flows, the amount of heat generated by the loss of a power semiconductor such as a switching element in the power supply device is very large. For this reason, various cooling methods have been studied for the purpose of avoiding damage to the power supply device. As one of the cooling methods, for example, as disclosed in Patent Document 1, a through-type terminal block having a conductor that is electrically connected to an external device is provided, and heat generation such as a switching element and a transformer constituting a power supply device is provided. The structure which water-cools the housing | casing which accommodates high components from the outside is known.

JP 2006-237537 A

  However, when this enclosure is affected by the exhaust heat from the engine and the external environment of the enclosure is hot, for example, when it is arranged in the vicinity of the engine of an automobile, the conductor of the penetration type terminal block is used. Heat from external devices and equipment will be transferred into the housing. For this reason, although the casing is cooled at a temperature lower than that of the external environment by a cooling method such as a water cooling method or a forced air blowing method, there is a possibility that the components provided inside are heated and damaged.

  The present invention has been made in view of the above, and an object of the present invention is to provide an electric device and a switching power supply device that can suppress the intrusion of heat into the device even when the external environment is high temperature. To do.

  In order to achieve the above object, an electrical device according to the present invention is an electrical device in which a through-type terminal block for inserting a conductive connection terminal is inserted into and attached to a mounting portion of a housing, and the housing includes: An electrically insulative thermally conductive member that has an opposing surface that opposes the distal end surface of the connection terminal, and that thermally connects the opposing surface of the housing and the distal end surface of the connection terminal. Is provided.

  In the above-described electric device, the connection terminal of the penetration type terminal block and the facing surface on the side of the housing provided to face the front end surface of the connection terminal are thermally connected by the electrically insulating heat conductive member. For this reason, the heat | fever conducted with respect to a connection terminal from the external cable etc. which are connected to a connection terminal can be conducted to the opposing surface of a housing via a heat conductive member. Thereby, even if an external environment is high temperature, it can suppress that the heat | fever conducted with respect to the connection terminal from the external environment penetrate | invades with respect to the inside of a housing.

  Here, it is preferable that one end portion having the tip end surface of the connection terminal protrudes into the housing.

  As described above, one end portion having the tip end surface of the connection terminal protrudes into the housing, so that, for example, the region protruding into the housing is thermally connected to the housing. Since a heat conductive member can also be provided, it can further suppress that the heat from the outside is conducted with respect to the passive component inside a housing.

  Moreover, the said housing can be set as the aspect provided with a cooling means.

  As described above, since the housing includes the cooling means, the heat that has entered the housing from the opposing surface of the housing through the heat conductive member can be cooled by the cooling means, and the heat is transferred to the housing. The temperature rise of the housing can be suppressed.

  Furthermore, it can be set as the aspect provided with the passive component provided in the inside of the said housing, and the electrically-conductive member which electrically connects the said connection terminal and the said passive component.

  As described above, even when a passive component is provided inside the housing and a current is passed between the connection terminal and the passive component via the conductive member, heat from the outside is enclosed via the thermally conductive member. Since it is conducted to the body, heat conducted from the connection terminal to the passive component through the conductive member can be reduced, and the occurrence of damage to the passive component due to temperature rise can be suppressed.

  Here, specifically as a structure which exhibits the said effect | action effectively, it is mentioned that the said passive component is a capacitor | condenser. Further, in the above electric device, the passive component may be a noise filter capacitor and may be disposed close to the connection terminal.

  As described above, in the electric device according to the present invention, the heat conducted from the external cable to the connection terminal is conducted to the housing via the heat conductive member. Therefore, even when the passive component is disposed at a position electrically close to the connection terminal via the conductive member, the passive component is not easily damaged by the heat conducted from the connection terminal. For this reason, it is possible to arrange a passive component, which is preferably arranged closer to the connection terminal, such as a noise filter capacitor, at a position close to the connection terminal. For example, when the noise filter capacitor is arranged closer to the output side connection terminal, the noise generated in the current flowing in the components in the housing is reduced in the noise filter capacitor and then from the connection terminal. Since the output current can be output to the outside, the inductance of the output current can be reduced, and the output current is stabilized. Therefore, adverse effects on external devices through which the output current flows can be reduced.

  In addition, a switching power supply device according to the present invention includes the above-described electric device. As described above, when the switching power supply device includes the above-described electric device, a highly heat-generating component such as a switching element or a transformer included in the switching power supply device flows into the device from the outside environment. It is possible to prevent exposure to high heat and to obtain a highly reliable switching power supply device.

  ADVANTAGE OF THE INVENTION According to this invention, even when the external environment is high temperature, the electrical apparatus and switching power supply device which can suppress the penetration | invasion of the heat | fever to the inside of an apparatus are provided.

It is a schematic perspective view which shows the structure of the switching power supply device which concerns on this embodiment. It is a schematic perspective view explaining each passive component which comprises a switching power supply device. It is a schematic perspective view which shows the structure of the cooling means provided in the bottom face of the switching power supply device. It is a disassembled perspective view which shows the structure of the attachment part of a penetration type terminal block and a housing. It is sectional drawing of the attachment part of a penetration type terminal block and a housing. It is a top view of the periphery of the through-type terminal block for explaining the arrangement of the through-type terminal block and the capacitor.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  1 is a schematic perspective view showing the configuration of the switching power supply according to the present embodiment, FIG. 2 is a schematic perspective view illustrating each passive component constituting the switching power supply, and FIG. 3 is a bottom view of the switching power supply. 4 is a schematic perspective view showing the configuration of the cooling means provided, FIG. 4 is an exploded perspective view showing the configuration of the through-type terminal block and the mounting portion of the housing, and FIG. 5 is a cross-sectional view of the mounting portion of the through-type terminal block and the housing. FIG. 6 is a top view of the periphery of the through-type terminal block for explaining the arrangement of the through-type terminal block and the capacitor.

  As shown in FIG. 1, the switching power supply device 1 according to the present embodiment is an electrical device that includes a housing 10 that includes a case body 11 and a lid 13 and a through-type terminal block 30 that is attached to a side surface of the housing 10. Each component is arranged inside. The case main body 11 and the lid portion 13 of the housing 10 are fixed by screws at the peripheral edge. The case body 11 includes a bottom wall portion 15 that forms the bottom surface of the case and a side wall portion 17 that forms the side surface of the case, and is integrally formed of a metal material such as aluminum. The through-type terminal block 30 is attached to the side wall portion 17 of the case body 11.

  And each component which comprises a switching power supply device is arrange | positioned inside the case main body 11 of this housing 10. As shown in FIG. Specifically, as shown in FIG. 2, the input capacitor 110, the switching element 120, the main transformer 130, the choke inductor 140, the control board 150, and the output capacitor 160 are accommodated inside the case body 11. These components are connected by a conductive member having conductivity such as a bus bar. Thereby, the switching power supply device 1 functions as a DC-DC converter.

  A cooling means for cooling the housing 10 is provided on the case bottom surface side of the case body 11. Specifically, as shown in FIG. 3, a plurality of meandering grooves are provided on the back surface side of the bottom wall portion 15 of the case body 11. And the cooling flow path 21 is formed by providing the coating | coated board 25 (A part of this coating | coated board 25 is fractured | ruptured and shown in FIG. 3) so that opening of this groove | channel may be covered. Water supply / drain ports 22 are provided at both ends of the cooling channel 21, and coolant (for example, water or antifreeze liquid) injected from one of the water supply / drain ports 22 passes through the cooling channel 21 and is on the opposite side. 22 is discharged. In this way, the coolant flows through the cooling flow path 21, whereby the back side of the bottom wall portion 15 on the bottom surface of the case is cooled. And each component which is mounted in the surface side of the bottom wall part 15 and comprises the above-mentioned switching power supply device 1 is cooled.

  Next, the penetration type terminal block 30 attached with respect to the side wall part 17 of the case main body 11 is demonstrated. As shown in FIG. 1, the penetration type terminal block 30 is attached to a protruding portion (attachment portion) 19 in which the side wall portion 17 of the case body 11 extends downward in the figure.

  As shown in FIGS. 4 and 5, the through-type terminal block 30 has a substantially cylindrical resin portion 31 made of an insulating member such as a resin and an inner portion so as to penetrate the center of the substantially cylindrical resin portion 31. And a conductive connection terminal 33 made of inserted metal or the like. Then, along a direction perpendicular to the insertion direction of the through-type terminal block 30 with respect to the housing 10 (axis A1 in FIG. 4) (that is, a direction in which a surface provided with an opening to which the through-type terminal block 30 is attached extends). A flange 31 a extending from the resin portion 31 is fixed to the protruding portion 19 by a screw 37. The through-type terminal block 30 is attached to the protruding portion 19 with an O-ring 35 interposed between the resin portion 31 and the protruding portion. Thereby, the inside of the case main body 11 is waterproofed in the vicinity of the attachment part of the penetration type terminal block 10.

  As shown in FIG. 5, the connection terminal 33 extends along the insertion direction of the penetrating terminal block 30 with respect to the housing 10 (direction in which the axis A <b> 1 extends), and is exposed to the outside of the housing 10 at one end. The outer end 33a to which the cable from the external device is attached and the end opposite to the outer end 33a are electrically connected to the internal components of the housing 10 via the bus bar (conductive member) 41 and the like. And an inner end portion 33b. Since the through-type terminal block 30 is attached to the protruding portion 19 with the resin portion 31 sandwiched between the connection terminal 33 and the side wall portion 17 of the case body 11, the connection terminal 33 and the side wall portion 17 are insulated. Is done. Further, the bus bar 41 and the inner end portion 33b of the connection terminal 33 are screws 39 in a state in which the bus bar 41 is in contact with the processing surface of the side surface of the inner end portion 33b that is processed so that a part thereof is flat. It is fixed by. The bus bar 41 is a passive component via another bus bar (not shown) and wiring on a printed circuit board (PCB) 42, and is connected to two noise filter capacitors 43 provided in parallel. . The noise filter capacitor 43 is made of, for example, a film capacitor or an electrolytic capacitor. Further, the bus bar 41 is also electrically connected to the output capacitor 160. The noise filter capacitor 43 is adjacent to the inner end 33b in the top view of FIG.

  In the switching power supply device 1 described above, the connection terminal 33 functions as an output-side terminal. That is, the current flowing through each component in the housing 10 is removed by the noise filter capacitor 43 that is grounded by being electrically connected to the housing 10, and is connected to the connection terminal 33 via the bus bar 41. Output to connected external cables.

  Here, an internal configuration of the protruding portion 19 into which the connection terminal 33 is inserted will be described. Inside the protruding portion 19, the bottom wall portion 15 is bent downward in a substantially vertical direction with respect to the bottom surface of the case body 11 along the outer shape of the protruding portion 19, so that a surface extending in a substantially vertical direction with respect to the bottom surface is formed. Made. And the bottom wall part 15 is bent again in the substantially horizontal direction, and the 2nd surface 15b which comprises the bottom face of the protrusion part 19 is provided. As a result, a facing surface 15 a extending in a substantially vertical direction is formed inside the main body case 11.

  On the other hand, the through-type terminal block 30 is inserted into the protruding portion 19 of the housing 10 with the end surface (tip surface) 33c of the inner end portion 33b of the connection terminal 33 being substantially vertical, and the end surface 33c and the facing surface 15a face each other. It is attached to the position to do. And between the end surface 33c and the opposing surface 15a, the heat-transfer sheet | seat 50 which is a heat conductive member which has electrical insulation is provided so that the end surface 33c and the vertical surface 15a may contact. Thereby, the end surface 33c and the opposing surface 15a are thermally connected.

  Furthermore, in the switching power supply device 1 according to the above-described embodiment, between the side surface of the connection terminal 33 and the second surface 15b that constitutes the bottom surface of the protruding portion 19, there is an electrical insulation that thermally connects both. A heat transfer sheet 51 which is a heat conductive member is provided.

  As the heat transfer sheets 50 and 51, for example, a silicon sheet or the like which is a material having electrical insulation and thermal conductivity is preferably used.

  The heat transfer sheets 50 and 51 can be provided so as to thermally connect the end surface 33c of the connection terminal 33 and the facing surface 15a by various methods. For example, when the heat transfer sheets 50 and 51 are made of an adhesive material, the heat transfer sheets 50 and 51 are previously attached to the opposing surface 15a and the second surface 15b, and the through-type terminal block 30 is illustrated in FIG. 5 can be brought into contact with the heat transfer sheet 50, and the side surface of the inner end 33 b can be brought into contact with the heat transfer sheet 51. Moreover, the heat-transfer sheets 50 and 51 can also be previously attached to either the housing 1 side or the connection terminal 33 using other members (for example, screws). Further, the heat transfer sheets 50 and 51 can be fixed by being sandwiched between the through-type terminal block 30 and the casing 10.

  In the switching power supply 1 having the above-described configuration, heat conducted from the outside via an external cable or the like attached to the outer end portion 33a of the connection terminal 33 is conducted to the inner end portion 33b and then transmitted. The heat is transmitted to the facing surface 15 a and the second surface 15 b of the housing 10 through the heat sheets 50 and 51, respectively, and to the bottom wall portion 15. And the bottom wall part 15 is cooled by the cooling fluid which flows through the cooling flow path 21 provided in the back surface side. Therefore, most of the heat conducted from the outside is conducted to the bottom wall portion 15 of the housing 10, so that the noise filter capacitor 43 provided inside the case body 11 from the connection terminal 33 through the bus bar 41. It is possible to suppress a large amount of heat from flowing to the parts including the heat, and to suppress the intrusion of heat into the apparatus even when the external environment is high temperature.

  Moreover, since the housing | casing 10 of the said embodiment is equipped with a cooling means in the back surface side, it penetrate | invaded into the bottom wall part 15 via the opposing surface 15a from the end surface 33c of the connection terminal 33 via the heat-transfer sheets 50 and 51. Heat can be cooled, and an increase in temperature of the casing 10 due to heat transfer to the casing 10 can be suppressed.

  Further, in the switching power supply device 1 of the above embodiment, conduction of heat conducted from the outside via an external cable or the like to the bus bar 41 is suppressed. On the other hand, the current flowing through each component in the housing 10 is removed from the noise component by the noise filter capacitor 43 provided on the printed circuit board 42 and flows to the connection terminal 33 via the bus bar 41 and the like. Output to other devices / equipment via external cable. In this manner, the current from which noise has been removed by the noise filter capacitor 43 can be output from the connection terminal 33 to the outside. In the switching power supply device 1 of the above embodiment, since the connection terminal 33 is thermally connected to the housing 10 by the heat transfer sheets 50 and 51, the noise filter capacitor 43 electrically connected by the bus bar 41 is used. On the other hand, a large amount of heat is prevented from being conducted from the connection terminal 33. Therefore, the passive component accommodated in the housing 10 can be disposed in the vicinity of the connection terminal 33. Specifically, like the switching power supply device 1 of the above-described embodiment, the noise filter capacitor 43 that is preferably arranged as close as possible to the connection terminal 33 is shown as an inner end portion in a top view of FIG. It can arrange | position in close proximity so that it may adjoin 33b. As a result, the noise filter capacitor 43 reduces the inductance of the current flowing from the connection terminal 33 at a position closer to the connection terminal 33. Therefore, it is possible to output a current from which noise is suitably removed to other devices and apparatuses that are electrically connected to the connection terminal 33, and to suppress adverse effects on the other devices and apparatuses.

  As mentioned above, although embodiment of this invention was described, the switching power supply device 1 which concerns on this invention can perform a various change. For example, in the above-described embodiment, the case where the end surface 33c of the connection terminal 33 is a surface extending in a substantially vertical direction has been described, but the end surface 33c may not have a shape extending in the vertical direction, for example, may be a spherical shape. Good. Even in this case, the connection terminal 33 is provided via an external cable or the like by providing the heat transfer sheet 50 that thermally connects the facing surface 15a of the housing 10 and the end surface 33c provided at a position facing the end surface 33c. The heat flowing to the housing 10 is conducted to the housing 10.

  In the above-described embodiment, the configuration in which the facing surface 15a of the housing 10 provided to face the end surface 33c of the connection terminal 33 is provided by bending the bottom wall portion 15 is described. However, the housing 10 only needs to include the facing surface 15a that is provided facing the end surface 33c of the connection terminal 33 and is thermally connected to the heat transfer sheet 50 and the cooling means. The shape of the side wall portion 17 can be variously changed. For example, without bending the bottom wall portion 15 so as to provide the protruding portion 19, a metal member different from the side wall portion 17 of the housing 10 and the metal member constituting the bottom wall portion 15 is heated with the side wall portion 17 or the bottom wall portion 15. It is also possible to provide the facing surface 15a by providing a new one so as to be connected. Further, even when the opposing surfaces 15a are provided on the surfaces of the bottom wall portion 15 and the side wall portion 17, a method different from the method of bending the bottom wall portion 15 as in the above embodiment can be employed.

  Moreover, although the connection terminal 33 of the penetration type terminal block 30 demonstrated the case where it had the function to output the electric current which flows through the inside of the housing | casing 10 with respect to another external apparatus and apparatus in the said embodiment, the electric current from the outside The structure which functions as an input terminal which inputs with respect to the components inside the housing 10 may be sufficient. Even in this case, the electric current from the outside is input to the components inside the housing 10 via the conductive member such as a bus bar, but the heat conducted via the external cable or the like is the heat transfer sheet 50. , 51 is conducted to the housing 10, it is possible to suppress heat transfer to the components placed in the housing 10 through the conductive member.

  Moreover, although the said embodiment demonstrated the structure whose cooling means is a water cooling system, you may employ | adopt other cooling systems, such as air cooling systems, such as forced ventilation. In this case, instead of the cooling flow path 21 described above, a configuration in which, for example, a radiating fin or the like is provided as a cooling means on the back surface side of the bottom wall portion 15 constituting the bottom surface of the case body 11 is conceivable. Even if the housing 10 does not include a cooling means, the heat flowing from the outside to the connection portion 33 is conducted to the housing 10 via the heat transfer sheets 50 and 51, thereby preventing the bus bar 41. It is possible to reduce the amount of heat that flows.

  Moreover, in the said embodiment, the heat-transfer sheet | seat 50 which thermally connects the end surface 33a of the connection terminal 33 and the opposing surface 15a, and the heat transfer which thermally connects the side surface of the connection terminal 33, and the 2nd surface 15b. Although the structure provided with the sheet | seat 51 was each demonstrated, the heat-transfer sheet | seat 50 which thermally connects at least the end surface 33a of the connecting terminal 33 and the opposing surface 15a should just be provided.

  The switching power supply device is not limited to the configuration shown in FIG. That is, the switching power supply device 1 according to the present embodiment is also suitably used for an inverter, for example. Further, the switching power supply device 1 may have a configuration in which, for example, only the noise filter capacitor 43 is accommodated in the housing 10.

DESCRIPTION OF SYMBOLS 1 ... Switching power supply device, 10 ... Housing, 11 ... Case main body, 13 ... Cover part, 15 ... Bottom wall part, 15a ... Opposite surface, 17 ... Side wall part, 19 ... Projection part (attachment part), 21 ... Flow for cooling Road, 22 ... Water supply / drain port, 30 ... Penetration type terminal block, 31 ... Resin part, 33 ... Connection terminal, 33c ... End face (tip face), 50, 51 ... Heat transfer sheet.

Claims (7)

An electrical device in which a through-type terminal block for inserting a conductive connection terminal is inserted and attached to a mounting portion of a housing,
The housing has a facing surface facing the tip surface of the connection terminal,
An electric device characterized in that an electrically insulating heat conductive member is provided between the facing surface of the housing and the tip surface of the connection terminal to thermally connect them.   The electric device according to claim 1, wherein one end portion of the connection terminal having the distal end surface protrudes into the housing.   The electric apparatus according to claim 1, wherein the housing includes a cooling unit. Passive components provided inside the housing;
The electric device according to claim 1, further comprising: a conductive member that electrically connects the connection terminal and the passive component.   The electric device according to claim 4, wherein the passive component is a capacitor.   The electric device according to claim 4, wherein the passive component is a capacitor for a noise filter and is disposed close to the connection terminal. A switching power supply device comprising the electric device according to claim 1.

Images