JP2021086759A - Wiring device - Google Patents

Abstract

To provide a wiring device that can improve heat dissipation performance of a power control element.SOLUTION: A wiring device 12 comprises a power board 50 that is a printed wiring board on which a power control element 55 is mounted, a first heat dissipation plate 52 for dissipating heat of the power control element 55, a second heat dissipation plate 53 combined with the first heat dissipation plate 52, and a case 20 comprising a housing part 29 housing the power board 50, the first heat dissipation plate 52, and the second heat dissipation plate 53. The case 20 comprises a protruding part 41 protruding into the housing 29 toward a direction in which the second heat dissipation plate 53 is combined with the first heat dissipation plate 52.SELECTED DRAWING: Figure 7

Description

An embodiment of the present invention relates to a wiring device including a power control element.

Conventionally, some wiring appliances such as dimmers and human sensor switches have a circuit configuration including a power control element. The power control element is a heat generating component, and when the load current is large, the amount of heat generated is also large. Therefore, in the wiring equipment provided with the power control element, the heat generated by the power control element is dissipated by using a heat sink. ..

It is often difficult to increase the size of the heat sink of the wiring device because it is attached to a standardized mounting frame. Therefore, it is conceivable to use a combination of a plurality of heat sinks in order to improve the heat dissipation of the power control element, but it is necessary to secure a clearance in order to cope with variations in the positions of the parts to be combined. In some cases, the heat sinks cannot be reliably brought into contact with each other, and the heat dissipation of the power control element cannot be sufficiently improved.

Japanese Unexamined Patent Publication No. 2011-154870

An object of the present invention is to provide a wiring device capable of improving heat dissipation of a power control element.

The wiring fixture of the embodiment includes a printed wiring board on which a power control element is mounted, a first heat sink that dissipates heat from the power control element, a second heat sink that is combined with the first heat sink, and a print. It includes a wiring board, a housing having a storage portion for accommodating a first heat sink and a second heat sink. The housing has a protrusion that projects into the storage portion in the direction in which the second heat sink is combined with the first heat sink.

According to the wiring device of the embodiment, it can be expected to improve the heat dissipation of the power control element.

It is a perspective view of the wiring equipment unit using the wiring equipment which shows one Embodiment. It is a perspective view of the dimmer which is the wiring fixture as above. It is the perspective view which removed the cover of the dimmer of the same as above. It is a perspective view which shows the power-source part of the dimmer of the same as above. It is the perspective view of the front side of the main body of the dimmer, the power-source part, and the 2nd heat sink in the disassembled state. It is the perspective view of the back side of the main body of the dimmer, the power-source part, and the 2nd heat radiating plate in the disassembled state. It is sectional drawing of FIG. 2AA of the dimmer of the same as above. It is sectional drawing of FIG. 2BB of the same dimmer.

Hereinafter, one embodiment will be described with reference to the drawings.

FIG. 1 shows the wiring equipment unit 10. The wiring fixture unit 10 constitutes a lighting system together with a lighting load. In the lighting system, the lighting load and the wiring fixture unit 10 are connected in series to the AC power supply, and the wiring fixture unit 10 controls lighting, extinguishing, and dimming of the lighting load.

The wiring equipment unit 10 is attached to a wiring box installed inside or outside the wall surface, and a plate covering the front side periphery of the wiring equipment unit 10 is attached. The wiring device unit 10 includes a mounting frame 11 that is a support for mounting on the wiring box, and wiring devices 12 and 13 mounted on the mounting frame 11, respectively.

The wiring fixture 12 is provided in a large-angle conjunctive two-module size standardized by the JIS standard. The wiring fixture 12 is a dimmer that is connected in series with the wiring fixture 13 and the lighting load to the AC power supply and employs a phase control method that variably controls the conduction angle of the AC voltage according to the dimming degree. On the front side of the wiring device 12, a front cover 14 arranged on the front side of the mounting frame 11 is attached, and a knob portion 15 through which the front cover 14 is inserted is arranged. The luminous intensity is adjusted by rotating the knob 15.

The wiring fixture 13 is provided in a large-angle conjunctive single module size standardized by the JIS standard. The wiring fixture 13 is a switch that is connected in series between the wiring fixture 12 and the lighting load and opens and closes an electric circuit between the wiring fixture 12 and the lighting load. A switch cover 16 for switching the opening and closing of the electric circuit by the wiring device 13 is attached to the front side of the wiring device 13.

Further, the illumination load has a light source such as a semiconductor light emitting element and a power conversion unit for lighting the light source. The power conversion unit inputs an AC voltage whose conduction angle is controlled by the wiring fixture 12, converts the AC voltage into a DC voltage and supplies it to the light source, and turns on the light source at the set dimming degree, or The dimming degree is detected from the conduction angle of the input AC voltage, the AC voltage is converted into a DC voltage according to the detected dimming degree and supplied to the light source, and the light source is turned on at the set dimming degree.

Next, FIG. 2 to FIG. 8 show the wiring device 12.

The wiring fixture 12 includes a housing 20, a power supply board 21 and a control board 22 housed in the housing 20, and a ribbon-shaped cable 23 that electrically connects the power supply board 21 and the control board 22. It includes an insulating paper 24 interposed between the power supply board section 21 and the control board section 22, and a knob section 15 for adjusting the dimming degree.

The housing 20 is made of an insulating resin. The housing 20 has a main body 27 and a cover 28 that is attached to the front side of the main body 27 in combination. The main body 27 is provided in a box shape with an opening on the front side. The cover 28 is formed in a box shape with the back side open. In the internal space formed by combining the main body 27 and the cover 28, a storage portion 29 in which the power supply board portion 21 and the control board portion 22 are housed is formed. A plurality of claws 30 are projected on the upper and lower surfaces of the main body 27, a plurality of hooks 31 are provided on the upper and lower surfaces of the cover 28, and the hooks 31 of the cover 28 are hooked on the claws 30 of the main body 27. The main body 27 and the cover 28 are fixed in a combined state.

The main body 27 has a back surface portion 33, an upper surface portion 34, a lower surface portion 35, and left and right side surface portions 36a and 36b, and is formed in a box shape with the front side open.

On the front side of the main body 27, a plurality of regulation parts 37 for positioning and restricting the insertion position of the power supply board part 21 (power supply board) to be inserted into the main body 27 are provided.

On the lower left side of the main body 27, a terminal storage portion 38 that opens to the front side is provided. Two electric wire insertion holes 39 are provided on the back side of the terminal accommodating portion 38.

A plurality of slit-shaped ventilation grooves 40 long in the front-rear direction are provided side by side in the left-right direction on the upper surface portion 34 and the lower surface portion 35 of the main body 27.

On the front side of the back surface 33 of the main body 27, a protrusion 41 is provided so as to project forward, that is, toward the inside of the storage unit 29. The protrusion 41 is located in the central region of the back surface portion 33 separated from the upper surface portion 34, the lower surface portion 35, and the left and right side surface portions 36a and 36b of the main body 27. The protrusion 41 is formed in a columnar shape having, for example, a diameter of 2.5 mm and a height of 0.9 mm. The protrusion 41 is not limited to a columnar shape, but may be a square columnar shape, a rectangular shape, a spherical shape, or the like. Further, although the protrusion 41 is integrally formed with the main body 27, it may be provided separately and attached to the main body 27.

Mounting portions 43 for mounting on the mounting frame 11 are provided on both the left and right sides of the cover 28. A holder plate 44 that rotatably holds the grip portion 15 is attached to the front surface side of the cover 28. On the front side of the cover 28, a window portion 45 for a lower limit setting switch, which is normally covered with the front cover 14 and is exposed by removing the front cover 14, is provided. On the back side of the cover 28, a plurality of units that abut against the peripheral portion of the power supply board portion 21 (power supply board) arranged in the main body 27 and press the power supply board portion 21 backward, that is, toward the inside of the main body 27. The pressing portion 46 of the above is projected. On the back side of the cover 28, a boss 48 for fixing the control board portion 22 (control board) with screws 47 is provided.

Further, the power supply board unit 21 includes a phase control circuit that variably controls the conduction angle of the AC voltage according to the dimming degree. The power supply board portion 21 is a first that dissipates heat generated by a power supply board 50 which is a printed wiring board, a plurality of power supply components 51 of a phase control circuit mounted on the power supply board 50, and heat generating components in the power supply component 51. The heat radiating plate 52 and the second heat radiating plate 53 are provided.

The power supply board 50 has a quadrangular shape and is formed in an outer shape that can be inserted and arranged in the main body 27 from the front side. In the power supply board 50, a wiring pattern is formed on the front side, which is one side, the power supply component 51 is arranged on the back side, which is the other side, and the leads of the power supply component 51 insert the power supply board 50 and solder to the wiring pattern. Soldering is connected.

The power supply component 51 includes two power control elements 55, a capacitor, a resistor, and the like that form a phase control circuit. The power control element 55 is, for example, a MOSFET. The power control element 55 is a heat generating component that generates heat due to power loss. In the power control element 55, the element body is housed in a resin package 56 having an insulating property, and three leads 57 of a gate, a drain, and a source connected to the element body are projected from the end of the package 56. .. The package 56 is provided with a screwed portion 58 having an insertion hole. The lead 57 is inserted through the power supply board 50 and soldered to the wiring pattern. The screwed portion 58 is attached to the first heat sink 52 by a screw 59 through which the insertion hole is inserted. By tightening the screw 59, one surface of the package 56 is in surface contact with the first heat sink 52.

The power supply component 51 includes two terminals 60 (see FIG. 8) mounted on the power supply board 50 so as to be arranged in the terminal storage portion 38 of the main body 27. The terminal 60 is arranged in the terminal storage portion 38 of the main body 27 in combination with a leaf spring, and the electric wire inserted from the electric wire insertion hole 39 is electrically connected. A crossover wiring for connecting to the wiring device 13 is connected to one terminal 60, and one of a pair of power supply lines for supplying AC power is connected to the other terminal 60.

The first heat radiating plate 52 is made of a metal material such as aluminum, which has excellent heat radiating properties. The first heat sink 52 has a substantially U-shaped cross section having an element mounting heat sink 61, an upper heat sink 62 provided by bending from both ends of the element mounting heat sink 61, and a lower heat sink 63. Is formed in. A screw 59 for inserting the screwed portion 58 of the power control element 55 is screwed into the element mounting heat sink portion 61 of the first heat sink 52, and by tightening the screw 59, the power control element 55 is attached to the element mounting heat sink portion 61. Package 56 is mounted in surface contact.

The first heat radiating plate 52 is arranged along the peripheral portion of the power supply board 50. The element mounting heat sink portion 61 is arranged along one side of the power supply board 50, the upper heat sink portion 62 is arranged along the upper side of the power supply board 50, and the lower heat sink portion 63 is arranged on the lower side of the power supply board 50. It is arranged along. Therefore, when the power supply board portion 21 is housed in the main body 27, the element mounting heat sink portion 61 faces the side surface portion 36b on one side of the main body 27 with a predetermined gap, and the upper heat sink portion 62 is the main body. The upper surface portion 34 of 27 is opposed to the lower surface portion 34 with a predetermined gap, and the lower heat sink portion 63 is opposed to the lower surface portion 35 of the main body 27 with a predetermined gap. Similar to the ventilation groove 40 provided in the main body 27, a plurality of slit-shaped ventilation grooves 64 long in the front-rear direction are formed side by side in the left-right direction in the upper heat-dissipating plate portion 62 and the lower heat-dissipating plate portion 63. The opening positions of the ventilation grooves 64 of the upper heat sink 62 and the lower heat sink 63 are arranged so as to be offset in the left-right direction with respect to the opening positions of the ventilation grooves 40 of the main body 27 to prevent dust from entering the inside. The heat dissipation is improved by making it easier for the air flow due to convection to act on the first heat sink 52.

The first heat sink 52 is supported by the power supply board 50 by the power control element 55. Therefore, the first heat sink 52 is perpendicular to the surface of the power supply board 50, such as being in contact with or away from the surface of the power supply board 50 due to variations in mounting of the power control element 55 with respect to the power supply board 50. The position in the direction may vary.

The second heat radiating plate 53 is thinner than the first heat radiating plate 52 and has a spring property. The second heat radiating plate 53 is made of metal having excellent heat radiating properties, and is formed of, for example, a 0.3 mm copper plate. The second heat radiating plate 53 has one end side heat radiating plate portion 66 and the other end side radiating plate portion 67 which are bent and formed via the bent portion 65. The angle θ formed by the heat radiating plate portion 66 on the one end side and the heat radiating plate portion 67 on the other end side is larger than 90 °, for example, about 100 °.

The second heat sink 53 is combined with the first heat sink 52. One end side heat sink 66 of the second heat sink 53 is combined with the back side of the first heat sink 52, and the other end heat sink 67 is outside the element mounting heat sink 61 of the first heat sink 52. Is combined with.

The second heat sink 53 is arranged in the main body 27 in combination with the first heat sink 52. The heat sink 66 on one end side of the second heat sink 53 is arranged along the back 33 of the main body 27, and the back side of the first heat sink 52 and the back 33 of the main body 27 (protrusion 41). It is placed so that it is sandwiched between the front side and the front side of the. The heat sink portion 67 on the other end side is arranged along the side surface portion 36b on one side of the main body 27, and also includes the element mounting heat sink portion 61 of the first heat sink plate 52 and the side surface portion 36b on one side of the main body 27. It is placed in a state of being sandwiched between.

The heat sink portion 66 on one end side is formed in a shape having a notch 68 at a position corresponding to the terminal accommodating portion 38 of the main body 27, corresponding to the shape of the back surface portion 33 of the main body 27. Vertical width of one end side heat sink 66 Wider than the distance between the upper heat sink 62 and the lower heat sink 63 of the first heat sink 52, the upper and lower edges of the one end heat sink 66 66a and 66a are formed in a shape dimension that allows contact with the back side of the upper heat sink portion 62 and the lower heat sink portion 63.

Since the angle θ of the heat sink portion 67 on the other end side with respect to the heat sink portion 66 on the one end side is larger than 90 °, the tip end side of the heat sink portion 67 on the other end side is one of the main bodies 27 when inserted into the main body 27. It is in contact with the side side surface 36b.

Further, the control board unit 22 includes a dimming control circuit that controls the power control element 55 of the phase control circuit of the power supply board unit 21 according to the dimming degree adjusted and operated by the knob unit 15. The control board unit 22 includes a control board 70 which is a printed wiring board, and a control component 71 of a dimming control circuit mounted on the control board 70. The control board 70 is arranged inside the cover 28 and is attached to the cover 28 by a screw 47 screwed onto the boss 48 of the cover 28.

The control component 71 includes a volume 72, a lower limit setting switch 73, and the like. The volume 72 has a volume body 74 mounted on the control board 70 and an adjustment shaft 75 projecting from the front side of the volume body 74, and a knob is connected to the tip of the adjustment shaft 75. The lower limit setting switch 73 projects the operation portion from the window portion 45 of the cover 28 to the front side, and switches the setting of whether or not to set the lower limit of the dimming value.

When assembling the wiring device 12, first, the control board portion 22 is assembled on the back side of the cover 28, and the control board 70 is attached to the cover 28 with screws 47. The knob portion 15 is fitted to the adjusting shaft 75 of the volume 72 protruding from the front side of the cover 28, and the knob portion 15 is rotatably attached to the cover 28 by the holder plate 44. The knob portion 15 may be attached to the cover 28 first, and the control board portion 22 may be combined with the cover 28.

The power supply board portion 21 is inserted and arranged in the main body 27. In this case, the second heat sink 53 is inserted into the main body 27 first, and then the power supply board 50 having the first heat sink 52 is inserted, or the second heat sink 53 is inserted into the main body 27. Is inserted into the power supply board 50 in a state where the above is combined with the first heat sink 52. At this time, work is performed in a state where the power supply board 50 and the control board 70 are connected by the cable 23.

Cover the cover 28 on the front side of the main body 27 and attach it.

Further, in the assembled state of the wiring fixture 12, the heat sink 66 on one end side of the second heat sink 53 is formed between the back side of the first heat sink 52 and the front side of the back 33 (protrusion 41) of the main body 27. The heat sink portion 67 on the other end side is arranged between the element mounting heat sink portion 61 of the first heat sink 52 and the side surface portion 36b on one side of the main body 27. Further, the power supply board 50 is positioned and held in the housing 20 in a state of being sandwiched between the regulating portion 37 of the main body 27 and the pressing portion 46 of the cover 28.

As described above, the first heat sink 52 supported by the power supply board 50 by the power control element 55 may have a variation in the position in the direction perpendicular to the surface of the power supply substrate 50, and thus absorbs this variation. A predetermined gap is provided between the back side of the first heat radiating plate 52 and the back side 33 of the main body 27, and the back side of the first heat radiating plate 52 contacts the back side 33 of the main body 27. There is nothing to do.

The position on the back side of the first heat radiating plate 52 is arranged behind the position on the front side of the protrusion 41 protruding from the back side 33 of the main body 27 regardless of the variation in the position of the first heat radiating plate 52. ing.

Therefore, the heat sink 66 on one end side of the second heat sink 53, which is arranged between the back surface side of the first heat sink 52 and the protrusion 41 of the main body 27, is the first heat sink 41 of the main body 27. It is sandwiched between the heat sink 52 and the back side, and the central region on the back side of the heat sink 66 on one end contacts the protrusion 41 of the main body 27, and the peripheral portion on the front side of the heat sink 66 on one end is the first. In contact with the back side of the heat sink 52 of the above, the central region of the heat sink 66 on one end is bent so as to be convexly curved toward the front, and the peripheral portion of the heat sink 66 on one end is the first. In addition to contacting the back side of the heat sink 52, the peripheral portion of the heat sink 66 on one end is pressed toward the back side of the first heat sink 52 by the spring force of the heat sink 66 on one end. .. Therefore, the first heat sink 52 and the second heat sink 53 are surely in contact with each other.

Further, a predetermined gap is provided between the element mounting heat sink portion 61 of the first heat sink 52 and the side surface portion 36b on one side of the main body 27 so that the first heat sink 52 can be inserted into the main body 27. It is provided. The other end side heat sink 67 of the second heat sink 53, which is arranged between the element mounting heat sink 61 of the first heat sink 52 and the side surface 36b on one side of the main body 27, is one end side heat sink. Since the angle θ with respect to the portion 66 is larger than 90 °, the tip end side of the other end side heat sink portion 67 contacts the side surface portion 36b on one side of the main body 27 when inserted into the main body 27, and the other end side heat sink plate The opposite end side (the base end side connected to the one end side heat sink 66) and the one end side heat sink 66, which are opposite to the tip side of the portion 67, are separated from the side surface 36b on one side of the main body 27. A spring force is generated toward it. As a result, at least the opposite end side of the other end side heat sink 67 is pressed against the element mounting heat sink 61 of the first heat sink 52, and at least the opposite end side of the other end heat sink 67 is the first heat sink 52. It is surely in contact with the element mounting heat sink portion 61 of. The heat sink portion 67 on the other end may come into contact with the tip end side of the screw portion 59 that penetrates the element mounting heat sink portion 61 of the first heat sink 52.

Then, the wiring fixture unit 10 is wired in series with the AC power supply together with the lighting load, and is attached to the wiring box on the wall surface. When the switch of the wiring fixture 13 is turned on, the electric circuit between the wiring fixture 12 and the lighting load is closed, and the lighting load is dimmed with the dimming intensity adjusted by the dimmer of the wiring fixture 12.

The wiring fixture 12 controls the power control element 55 according to the dimming degree by the rotation operation of the knob 15, and variably controls the conduction angle of the AC voltage supplied to the lighting load. The power control element 55 generates heat due to power loss associated with variable control of the conduction angle of the AC voltage. The heat of the power control element 55 is transferred to the first heat sink 52, further transferred from the first heat sink 52 to the second heat sink 53, and these first heat sink 52 and second heat sink 53. Heat is dissipated into the air inside the main body 27.

Since a plurality of ventilation grooves 40 are provided on the upper and lower surfaces of the main body 27, the air warmed in the main body 27 rises and is discharged to the outside from the ventilation grooves 40 on the upper surface side of the main body 27, and the main body 27 Convection occurs in which outside air, which is cooler than the inside temperature, flows into the main body 27 from the ventilation groove 40 on the lower surface side of the main body 27, and the heat of the power control element 55 is dissipated.

At this time, the heat of the power control element 55 is efficiently dissipated from the first heat sink 52 and the second heat sink 53 in contact with the first heat sink 52, so that the load current is large and the power is controlled. Even if the amount of heat generated by the element 55 increases, heat can be reliably dissipated.

According to the wiring device 12 configured in this way, the storage portion 29 of the housing 20 has a protrusion 41 that protrudes in the direction in which the second heat radiating plate 53 is combined with the first heat radiating plate 52. , The second heat radiating plate 53 can be surely brought into contact with the first heat radiating plate 52, and the heat radiating property of the power control element 55 can be improved.

Further, since the second heat radiating plate 53 comes into contact with the first heat radiating plate 52 in a state of being bent by the protrusion 41, the second heat radiating plate 53 is surely brought into contact with the first heat radiating plate 52, and the heat radiating property is improved. Can be improved.

Further, the second heat sink 53 is bent from one end side heat sink 66 arranged between the first heat sink 52 and the protrusion 41 and the one end side heat sink 66 to dissipate the first heat. Since it has the heat radiating plate portion 67 on the other end side that contacts the plate 52, the heat radiating property can be further improved.

Further, the configuration of the wiring fixture 12 can be applied to a dimmer that phase-controls the conduction angle of the AC voltage input to the lighting load by using the power control element 55.

The second heat radiating plate 53 may be provided with at least one end side radiating plate portion 66, and may not be provided with the other end side radiating plate portion 67.

Further, the protrusion 41 may be provided by cutting out a part of the second heat radiating plate 53, for example, but can be easily provided by integrally molding the main body 27.

Further, the wiring device is not limited to the dimmer as long as it is a wiring device provided with a power control element which is a heat generating component, and may be, for example, a motion sensor or the like.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

12 Wiring equipment
20 chassis
29 Storage
41 ridge
50 Power supply board, which is a printed wiring board
52 First heat sink
53 Second heat sink
55 Power control element
66 One end side heat sink
67 Heat sink on the other end

Claims (5)

With a printed wiring board on which a power control element is mounted;
With the first heat sink that dissipates the heat of the power control element;
With a second heat sink combined with the first heat sink;
The printed wiring board, the storage portion for storing the first heat sink and the second heat sink, and the second heat sink project into the storage portion in a direction in which the second heat sink is combined with the first heat sink. With a housing having a heat sink;
Wiring equipment characterized by being equipped with. The wiring device according to claim 1, wherein the second heat sink comes into contact with the first heat sink by the protrusion. The wiring device according to claim 2, wherein the second heat radiating plate has a spring property and comes into contact with the first heat radiating plate in a state of being bent by the protrusion. The second heat radiating plate is bent from one end side heat radiating plate portion arranged between the first radiating plate and the protrusion and the one end side radiating plate portion to come into contact with the first heat radiating plate. The wiring device according to any one of claims 1 to 3, further comprising a heat sink portion on the other end side. The wiring device according to any one of claims 1 to 4, wherein the dimmer is a dimmer that phase-controls the conduction angle of an AC voltage input to a lighting load by using the power control element.

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