CN110914592B - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
CN110914592B
CN110914592B CN201780091019.3A CN201780091019A CN110914592B CN 110914592 B CN110914592 B CN 110914592B CN 201780091019 A CN201780091019 A CN 201780091019A CN 110914592 B CN110914592 B CN 110914592B
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CN
China
Prior art keywords
power supply
base
light source
lighting device
cooling fan
Prior art date
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Active
Application number
CN201780091019.3A
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Chinese (zh)
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CN110914592A (en
Inventor
松原大介
伏江辽
吉野勇人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
Original Assignee
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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Publication of CN110914592A publication Critical patent/CN110914592A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The lighting device (1A) is provided with: a base (2); a light emitting element disposed below the base (2); a plurality of heat radiating fins (4) arranged above the base (2); a cooling fan (6) that generates an airflow that cools the base (2) and the plurality of fins (4); and a power supply device (7) having a light source drive circuit for lighting the light emitting elements and a power supply housing (7d) for housing the light source drive circuit. The power supply device (7) is disposed above the plurality of heat sinks (4). The cooling fan (6) is disposed above the power supply device (7). The base center line (BC) is a straight line passing through the center of the base (2) and perpendicular to the base (2). The power supply center line (PC) is a straight line passing through the center of the power supply housing (7d) and perpendicular to the base (2). The power supply center line (PC) is offset with respect to the base center line (BC).

Description

Lighting device
Technical Field
The present invention relates to a lighting device.
Background
Lighting devices using light emitting elements such as Light Emitting Diodes (LEDs) are widely used. When the temperature of the light-emitting element increases due to heat generation of the light-emitting element, energy efficiency decreases or the lifetime of the light-emitting element becomes short. Therefore, it is desirable to improve heat dissipation of the light emitting element so as to prevent the temperature of the light emitting element from becoming high. In particular, since a lighting device for a high ceiling installed on a high ceiling in a factory, a warehouse, a gym, a sports facility, or the like is placed in an environment having a high temperature, cooling of a light emitting element becomes more important.
Patent document 1 below discloses a lighting device including a heat sink (40) for dissipating heat from a light-emitting element, a cooling fan (60), and a power supply device (80) in a casing (20), in which the cooling fan (60) is disposed above the heat sink (40), and the power supply device (80) is disposed above the cooling fan (60). In addition, the reference numerals in patent document 1 are shown in parentheses.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-212131
Disclosure of Invention
Problems to be solved by the invention
The conventional system described above has the following problems. Since the cooling fan (60) is sandwiched between the heat sink (40) and the power supply device (80), the air flow generated by the cooling fan (60) has a large air flow resistance. Therefore, it is difficult to increase the air volume and improve the cooling performance.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a lighting device capable of improving cooling performance for a light-emitting element and a power supply device.
Means for solving the problems
The lighting device of the present invention includes: a base; a light emitting element disposed below the base; a plurality of heat sinks arranged above the base; a cooling fan which generates an air flow for cooling the base and the plurality of fins; and a power supply device having a light source drive circuit for lighting the light emitting element and a power supply housing for housing the light source drive circuit, wherein the power supply device is disposed above the plurality of heat radiating fins, the cooling fan is disposed above the power supply device, a center line of the base is a straight line passing through the center of the base and perpendicular to the base, a center line of the power supply is a straight line passing through the center of the power supply housing and perpendicular to the base, and the center line of the power supply is offset with respect to the center line of the base.
Further, the lighting device of the present invention includes: a base; a light emitting element disposed below the base; a plurality of heat sinks arranged above the base; a cooling fan disposed above the plurality of fins and generating an air flow for cooling the base and the plurality of fins; a power supply device having a light source drive circuit for lighting the light emitting element and a power supply housing for housing the light source drive circuit, the power supply device being positioned above the cooling fan; and a power supply support member that supports the power supply device on the base, the power supply support member having a leg portion connected to the base and a beam portion supported by the leg portion and fixed to the power supply housing, the power supply housing having an air inlet and an air outlet that communicate the inside and the outside of the power supply housing, the power supply housing having a protruding portion that protrudes outward beyond an edge of the beam portion when viewed in a direction perpendicular to a longitudinal direction of the beam portion, the air inlet and the air outlet being formed in the protruding portion of the power supply housing.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the cooling performance for the light emitting element and the power supply device can be improved.
Drawings
Fig. 1 is a perspective view of the lighting device of embodiment 1 as viewed from obliquely above.
Fig. 2 is a perspective view of the lighting device of embodiment 1 as viewed obliquely from below.
Fig. 3 is a cross-sectional side view of the lighting device of embodiment 1.
Fig. 4 is a sectional view of a power supply device provided in the lighting device according to embodiment 1.
Fig. 5 is a functional block diagram of the lighting device according to embodiment 1.
Fig. 6 is a diagram showing a relationship among a light beam emitted from the light emitting element, a light source current, and a light source temperature.
Fig. 7 is a cross-sectional view of a power supply device provided in a modification of the illumination device according to embodiment 1.
Fig. 8 is a perspective view of the lighting device of embodiment 2 as viewed from obliquely above.
Fig. 9 is a plan view of the lighting device of embodiment 2 as viewed from a direction perpendicular to the base.
Fig. 10 is a perspective view of the lighting device of embodiment 3 as viewed from obliquely above.
Fig. 11 is a cross-sectional side view of the lighting device of embodiment 3.
Fig. 12 is a sectional view of a power supply device provided in the lighting device according to embodiment 3.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings. The same reference numerals are given to the common or corresponding elements in the drawings, and redundant description is simplified or omitted. The present disclosure can include all combinations of combinable configurations among the configurations described in the embodiments below.
Embodiment mode 1
Fig. 1 is a perspective view of an illumination device 1A according to embodiment 1 as viewed from obliquely above. Fig. 2 is a perspective view of the lighting device 1A according to embodiment 1, as viewed obliquely from below. Fig. 3 is a cross-sectional side view of the lighting device 1A of embodiment 1. Fig. 4 is a sectional view of the power supply device 7 included in the illumination device 1A according to embodiment 1. Fig. 5 is a functional block diagram of the lighting device 1A according to embodiment 1. The illumination device 1A of embodiment 1 shown in these figures is installed on a ceiling and irradiates light downward, and thus can be preferably used for an application of irradiating a space below the illumination device 1A. In the following description, the up and down directions are determined based on the posture when the lighting device 1A is used. The lighting device 1A can be suitably used as a device that emits a light beam of several thousand lumens to several ten thousand lumens, for example. The lighting device 1A is particularly suitable for use in a factory, a warehouse, a gymnasium, a sports facility, or the like.
The lighting device 1A includes a base 2, a light emitting element 3, a heat sink 4, a cooling fan 6, and a power supply device 7. As shown in fig. 1 and 3, the base 2 has a substantially plate-like shape as a whole. The base 2 has an upper surface and a lower surface. When the lighting device 1A is used, the upper surface and the lower surface of the base 2 are substantially horizontal. In the present embodiment, the shape of the base 2 is circular when viewed from the direction perpendicular to the base 2. As a modification, the shape of the base 2 may be rectangular or square when viewed from the direction perpendicular to the base 2.
A ring 11 is attached to the peripheral edge of the base 2. The ring 11 has an annular shape along the peripheral edge of the base 2.
As shown in fig. 2, a plurality of light emitting elements 3 are disposed below the base 2. The light emitting element 3 irradiates light downward from the lighting device 1A. The light emitting element 3 in the present embodiment includes a Light Emitting Diode (LED). The light emitting element 3 is disposed to be able to conduct heat to the lower surface of the base 2. Heat generated by the light emitting element 3 is conducted toward the base 2. The light emitting element 3 may be in contact with the lower surface of the base 2 via a heat conductive material. The upper surface of the light source substrate (not shown) having the light emitting element 3 mounted on the lower surface thereof may be in contact with the lower surface of the base 2 directly or via a heat conductive material. The thermally conductive material may be any of thermally conductive grease, a thermally conductive sheet, a thermally conductive adhesive, and a thermally conductive double-sided adhesive tape, for example. The light source substrate on which the light emitting element 3 is mounted and the base 2 may be integrally formed.
As the light emitting element 3, for example, at least one of a surface mount type LED package, a shell type LED package, a light distribution lens-equipped LED package, a chip-scale packaged LED, and a chip-on-board (COB) type LED package can be used. The light-emitting element 3 is not limited to the LED, and may include, for example, an organic Electroluminescence (EL) element, a semiconductor laser, or the like.
A plurality of heat sinks 4 are disposed above the base 2. The base 2 and the heat sink 4 cool the light emitting element 3 by dissipating heat generated by the light emitting element 3 to the surrounding air. The base 2 and the heat sink 4 correspond to a heat sink. The heat sink 4 protrudes from the upper surface of the base 2. The heat sink 4 is perpendicular to the upper surface of the base 2. The heat sink 4 in the present embodiment has a plate-like shape. Heat generated by the light emitting element 3 is conducted to the base 2, and further conducted from the base 2 to the heat sink 4. Heat is dissipated from the surfaces of the base 2 and the heat sink 4 to the surrounding air. By increasing the surface area of the heat sink by the base 2 and the heat sink 4, heat generated by the light emitting element 3 can be efficiently dissipated. As a result, the temperature of the light emitting element 3 can be reduced, so that the energy efficiency, that is, the light emitting efficiency of the light emitting element 3 can be improved, and the life of the light emitting element 3 can be extended. As a modification, a heat pipe that moves heat from the base 2 to the heat sink 4 may be provided.
The plurality of fins 4 are arranged in a radial shape when viewed from a direction perpendicular to the base 2. The plurality of fins 4 extend radially outward from the central region of the base 2. As a modification, a plurality of plate-shaped fins 4 may be arranged in parallel with each other. As another modification, the heat sink 4 may be a pin fin having a pin shape.
The base 2 and the heat sink 4 are preferably made of a metal material that is lightweight and has a high thermal conductivity. Examples of such a metal material include aluminum, aluminum-based alloys, copper-based alloys, and stainless steel. The heat sink 4 of the present embodiment is manufactured by bending a thin metal plate. This can reduce the weight. In the present embodiment, two adjacent fins 4 are formed by bending one metal thin plate. As shown in fig. 1, the base end portions of two adjacent fins 4 formed of one metal thin plate are connected via a fixing portion 4 a. The fixing portion 4a is fixed to the base 2. The heat sink 4 may be fixed to the base 2 by any method such as caulking, screwing, bonding, welding, or brazing. The base 2 and the heat sink 4 may be integrally formed by, for example, die casting.
A power supply device 7 is disposed above the plurality of heat sinks 4. A cooling fan 6 is disposed above the power supply device 7. The cooling fan 6 generates an air flow for cooling the base 2 and the heat sink 4. In the present embodiment, the cooling fan 6 is an axial fan including a propeller fan and a motor for rotating the propeller fan. The center line of the cooling fan 6 is perpendicular to the base 2. The rotation axis of the propeller fan of the cooling fan 6 is perpendicular to the base 2. The direction of the airflow blown out from the cooling fan 6 is perpendicular to the base 2.
As shown in fig. 4, the power supply device 7 includes an electronic circuit board 7c, a power supply housing 7d, and a heat sink 7 m. An electronic circuit board 7c is housed in the power supply housing 7 d. The power supply device 7 includes a light source drive circuit 7a for supplying a current to turn on the light emitting elements 3 and a fan drive circuit 7b for supplying a current to drive the cooling fan 6. The electronic circuit board 7c constitutes a light source drive circuit 7a and a fan drive circuit 7 b. As a modification, the electronic circuit board of the light source drive circuit 7a and the electronic circuit board of the fan drive circuit 7b may be separated. As another modification, the fan drive circuit 7b may be provided inside the cooling fan 6. The power supply housing 7d has a substantially rectangular parallelepiped shape.
The electronic circuit board 7c is provided with an electric element 7 j. When the lighting device 1A is turned on, the electric element 7j generates heat. The electric element 7j may be any one of a semiconductor element, a reactor, a resistor, and a capacitor, for example. The power supply frame body 7d has a first side wall 7h forming a first side surface and a second side wall 7i forming a second side surface opposite to the first side surface. The electric element 7j is in contact with the inner surface of the first side wall 7h via the thermally conductive material 7 k. Heat generated from the electric element 7j is conducted to the first side wall 7h of the power supply housing 7d via the heat conductive material 7 k. As a modification, the electric element 7j may be in direct contact with the inner surface of the first side wall 7 h. The electronic circuit board 7c is also provided with a plurality of electric elements 7 n. Each electrical element 7n may be any one of a semiconductor element, a reactor, a resistor, and a capacitor, for example. The power supply frame body 7d has an upper wall 7p forming an upper surface.
The heat sink 7m is disposed outside the first side wall 7h of the power supply housing 7 d. As shown in fig. 1, the heat sink 7m includes a plate-shaped base portion that is in contact with the outer surface of the first side wall 7h directly or via a thermally conductive material, and a plurality of fins that protrude outward from the base portion. Heat generated from the electric elements 7j and 7n of the power supply device 7 is transferred to the power supply housing 7d, and dissipated from the surface of the power supply housing 7d to the surrounding air. Further, a part of the heat transferred to the power supply housing 7d is further transferred to the heat sink 7m, and dissipated from the surface of the heat sink 7m to the air. Thus, the power supply device 7 is cooled, and a decrease in the efficiency of the power supply device 7 can be prevented.
As shown in fig. 1 and 2, the power supply device 7 is supported by a power supply support 8. The power supply support 8 supports the power supply device 7 on the base 2. The power source support 8 has a leg portion 8a and a beam portion 8 b. The two leg portions 8a are disposed at positions opposite to each other with the center of the base 2 interposed therebetween. The lower end of each leg 8a is connected to the base 2. Each leg 8a is disposed outside the heat sink 4. The beam portion 8b connects the upper ends of the two leg portions 8 a. The beam portion 8b is supported by the two leg portions 8 a. The beam portion 8b is arranged parallel to the base 2. The power supply housing 7d is fixed to the beam portion 8 b.
As shown in fig. 3, the upper wall 7p of the power supply housing 7d is fixed to the lower surface of the beam portion 8b of the power supply support 8. The bottom surface of the power supply housing 7d is located higher than the upper end of the heat sink 4. A space is provided between the bottom surface of the power supply housing 7d and the upper end of the heat sink 4. The cooling fan 6 is supported by a fan support 12. Fan support member 12 supports cooling fan 6 on beam portion 8b of power supply support member 8. Fan support member 12 has a portion fixed to the upper surface of beam 8b and a portion fixed to cooling fan 6. The cooling fan 6 is fixed to the beam portion 8b of the power supply support member 8 via the fan support member 12.
The base 2, the cooling fan 6, the power supply housing 7d, the power supply support 8, the ring 11, the fan support 12, and other components may be fixed to each other by any method such as screwing, welding, soldering, bonding, or fitting.
As shown in fig. 1, the lighting device 1A includes a main body support 9. The body support 9 supports the body of the lighting device 1A. The main body of the lighting device 1A includes a base 2, a light emitting element 3, a plurality of heat sinks 4, a cooling fan 6, a power supply device 7, a power supply support 8, a ring 11, and a fan support 12. The body support 9 has an elongated plate-like fixed portion 9a and a pair of arm portions 9b protruding from both ends of the fixed portion 9 a. Each arm portion 9b protrudes in a direction perpendicular to the longitudinal direction of the fixed portion 9 a. A long hole 9c curved in an arc shape is formed at the tip end portion of each arm portion 9 b. The body mount 9 is connected to the body of the lighting device 1A so as to be relatively rotatable. Each arm 9b is connected to the ring 11 so as to be relatively rotatable. The ring 11 has protruding portions 11a protruding upward from two circumferential locations. Each arm 9b is connected to a projection 11a of the ring 11. The bolt 10 is inserted into a screw hole provided in the projection 11a of the ring 11 through the elongated hole 9c of the arm portion 9b of the body support 9. The position of the rotation axis RA of the main body support 9 is a position along the center of the circle of the arc of the elongated hole 9 c. As a modification, the position of the bolt 10 may be the position of the rotation axis RA of the body support 9. The rotation axis RA is parallel to the susceptor 2. The rotation axis RA passes through the center of the susceptor 2 when viewed from a direction perpendicular to the susceptor 2.
When the lighting device 1A is installed, the body mount 9 is fixed to the body of the lighting device 1A so as not to rotate relative thereto by fastening the bolt 10. The bolt 10 is an example of a fixing means capable of fixing the body mount 9 to the body of the lighting device 1A so as not to rotate relatively.
The fixing portion 9a of the body mount 9 is fixed to a mounting surface such as a ceiling or a beam of a building. The fixing portion 9a is formed with a hole through which the fixing bolt is inserted. In the state of fig. 1 to 3, the fixing portion 9a is parallel to the base 2. When the attachment surface is horizontal, the fixing portion 9a of the body stay 9 is fixed to the attachment surface in this state. Thereby, the lighting device 1A is fixed in an appropriate posture in which the base 2 is horizontal. On the other hand, when the mounting surface is an inclined surface inclined with respect to the horizontal plane, the angle of the body mount 9 with respect to the body of the lighting device 1A can be changed so that the arm portion 9b of the body mount 9 is perpendicular to the inclined surface. That is, when the bolt 10 is loosened, the body mount 9 can be rotated about the rotation axis RA, and the body mount 9 can be tilted with respect to the body of the lighting device 1A. When the body support 9 is tilted with respect to the body of the lighting device 1A, the bolt 10 moves relatively with respect to the elongated hole 9 c. The body support 9 can be fixed at the inclined angle by tightening the bolt 10 again. In this way, when the mounting surface is an inclined surface, the fixing portion 9a can be inclined so that the arm portion 9b of the main body support 9 is perpendicular to the inclined surface. Thereby, the lighting device 1A can be set in an appropriate posture.
As shown in fig. 3, the base center line BC is a straight line passing through the center of the base 2 and perpendicular to the base 2. The power supply center line PC is a straight line passing through the center of the power supply housing 7d and perpendicular to the base 2. The power supply center line PC is offset from the base center line BC. Fig. 3 is a sectional view taken along a plane including a base center line BC and a power supply center line PC. Fig. 3 is a sectional view taken along a plane perpendicular to the rotational axis RA of the body support 9. The centerline of the cooling fan 6 coincides with the base centerline BC.
When the cooling fan 6 is operated, as described below. The air flow generated by the cooling fan 6 is schematically represented by the curve with arrows in fig. 3. An air flow is blown downward from the cooling fan 6. The air flow is blown to the upper surface of the base 2 through between the heat radiating fins 4. The air flow blowing onto the base 2 changes direction. The airflow blown onto the susceptor 2 flows radially from the central region of the susceptor 2 to the outer peripheral side of the susceptor 2 through the space between the fins 4. In this way, the airflow generated by the cooling fan 6 flows along the upper surface of the base 2 and the surface of the heat sink 4, so that the heat of the light-emitting element 3 can be dissipated more efficiently, and the temperature of the light-emitting element 3 can be further reduced. In particular, according to the present embodiment, the heat radiating fins 4 are arranged in a radial shape, whereby the airflow from the cooling fan 6 can be efficiently discharged to the outer peripheral side of the base 2. Therefore, the air can smoothly flow, and the cooling efficiency is further improved.
Further, a part of the airflow generated by the cooling fan 6 is blown to the surface of the power supply housing 7 d. This can promote heat dissipation from the surface of the power supply housing 7d, and can efficiently cool the power supply device 7. As a result, a decrease in the efficiency of the power supply device 7 can be more reliably prevented. By offsetting the power supply center line PC with respect to the base center line BC, the following effects can be obtained. The airflow from the cooling fan 6 to the base 2 and the heat sink 4 is arranged so as not to be easily obstructed by the power supply housing 7 d. Since the airflow generated by the cooling fan 6 has a small ventilation resistance, the air volume can be increased. Therefore, the cooling efficiency of the base 2 and the heat sink 4 can be improved. As described above, according to the present embodiment, convection is generated by the cooling fan 6, whereby both the light-emitting element 3 and the power supply device 7, which are heat sources, can be efficiently cooled at the same time. In particular, in the present embodiment, the base center line BC passes through the outside of the power supply casing 7 d. This can more reliably prevent the airflow from the cooling fan 6 to the base 2 and the heat sink 4 from being blocked by the power supply housing 7 d. Therefore, the air flow resistance of the air flow generated by the cooling fan 6 can be further reduced, and the air volume can be further increased.
Fig. 4 is a sectional view taken at the same position as fig. 3. As shown in fig. 4, the distance between the first side wall 7h of the power supply frame body 7d and the base center line BC is smaller than the distance between the second side wall 7i and the base center line BC. The closer to the center line BC of the base, the faster the airflow generated by the cooling fan 6 tends to be. Therefore, the first side wall 7h collides with the faster air flow and is thus easily cooled. According to the present embodiment, heat generated from the electric element 7j can be conducted to the first side wall 7h which is easily cooled. Therefore, the temperature of the electric element 7j can be reduced, which is advantageous for improving the efficiency of the power supply device 7. Further, according to the present embodiment, since the radiator 7m provided outside the first side wall 7h is provided, the radiator 7m collides with a relatively fast airflow. Therefore, the temperature of the power supply device 7 can be further reduced. However, the heat sink 7m may be omitted.
As described above, the airflow flows between the fins 4 in the radial direction of the susceptor 2 and is discharged to the outer peripheral side of the susceptor 2. If a structure exists outside the heat sink 4, the airflow is difficult to flow. Therefore, at the position of the leg portion 8a of the power source support 8, the airflow discharged outward from between the fins 4 may be difficult to flow.
As shown in fig. 1, each arm portion 9b of the main body support 9 is located outside each leg portion 8a of the power supply support 8. This can provide the following effects. The arm portions 9b of the main body support 9 can be prevented from interfering with the airflow discharged outward from between the fins 4. If the arm portion 9b of the main body support 9 is disposed at a position different from the leg portion 8a of the power supply support 8, the arm portion 9b of the main body support 9 may interfere with the air flow discharged outward from between the heat sinks 4. In contrast, according to the present embodiment, the arm portion 9b of the main body support 9 does not obstruct the airflow discharged outward from between the fins 4, and the cooling performance can be further improved.
As a modification, instead of the axial flow fan as in the present embodiment, a centrifugal fan, a diagonal flow fan, a cross flow fan, or the like may be used as the cooling fan 6. The cooling fan 6 may be any fan as long as it is a fan of a forced air cooling system.
The power supply frame 7d, the power supply support 8, the body support 9, the ring 11, and the fan support 12 are preferably made of a metal material having high strength and high thermal conductivity. Examples of the metal material include aluminum, aluminum-based alloys, and stainless steel.
As shown in fig. 1, the lighting device 1A includes a cable 13 for supplying power from the power supply device 7 to the light-emitting element 3 and a cable 14 for supplying power from the power supply device 7 to the cooling fan 6. The cables 13, 14 are preferably covered with a rubber-like material or the like so as to have waterproofness. The light emitting element 3 is turned on by passing a current from the power supply 7 through the cable 13 to the light emitting element 3. The cooling fan 6 is rotated by passing a current from the power supply device 7 through the cooling fan 6 via the cable 14.
As shown in fig. 3, the lighting device 1A of the present embodiment includes a light-transmissive cover 15. The light-transmitting cover 15 is disposed below the base 2 and fixed to the ring 11. The light-transmitting cover 15 entirely covers the region where the plurality of light-emitting elements 3 are arranged. Light from the light emitting element 3 passes through the translucent cover 15 and is irradiated to the outside of the illumination device 1A. The light-transmitting cover 15 reliably protects the light-emitting element 3 from dirt, water, or the like. By providing the light-transmitting cover 15, deterioration or failure of the light-emitting element 3 can be reliably prevented. The light-transmissive cover 15 may also be made of a transparent material that allows light to be regularly transmitted (japanese: water vapor). Alternatively, the light-transmissive cover 15 may also transmit light diffusely. The light-transmitting cover 15 may be made of a resin material such as a polycarbonate resin, an acrylic resin, or a polystyrene resin, or a glass material. A coating treatment, such as a hard coating treatment, which is advantageous for suppressing aging, may also be applied to the surface of the light-transmissive cover 15. The light-transmitting cover 15 may also have waterproofness. A waterproof sealing material or adhesive may be provided at the joint between the light-transmitting cover 15 and the ring 11. The sealing material or the adhesive may be made of, for example, a soft resin material, a sealing material such as silicone, a rubber material, or the like.
As shown in fig. 5, in the present embodiment, the power supply device 7 includes a control unit 7e in addition to the light source drive circuit 7a and the fan drive circuit 7 b. The control unit 7e drives the light source unit 17 via the light source drive circuit 7 a. The control unit 7e drives the cooling fan 6 via the fan drive circuit 7 b. The control unit 7e includes a processor 7f and a memory 7 g. Typically, the control unit 7e has a structure including a microcomputer. The control unit 7e is provided in the power supply housing 7 d. The control unit 7e is provided on the electronic circuit board 7 c. As a modification, the electronic circuit board constituting the control unit 7e and the electronic circuit boards constituting the light source drive circuit 7a and the fan drive circuit 7b may be separated.
The light source section 17 is constituted by a plurality of light emitting elements 3. In the example of fig. 5, the light source section 17 has a plurality of light emitting elements 3 connected in series. Instead of this example, the plurality of light emitting elements 3 in the light source section 17 may be connected in parallel or in series-parallel.
The light source driving circuit 7a causes a current to flow through the light emitting element 3 of the light source section 17. The light source driving circuit 7a includes a power supply circuit that converts ac power supplied from an ac power supply 100 outside the lighting device 1A into dc power. The power supply circuit may include a switching power supply using a semiconductor switching element, for example. Typically, the ac power supply 100 is a commercial power supply. The light source driving circuit 7a adjusts the current flowing through the light emitting element 3 in accordance with a command from the control unit 7e, and thereby can adjust the light beam emitted from the light emitting element 3. This allows adjustment of the illuminance and brightness of the illumination device 1A.
Hereinafter, the temperature related to the temperature of the light emitting element 3 of the light source unit 17 is referred to as "light source temperature". The light source temperature sensor 18 detects the light source temperature. The light source temperature sensor 18 is an example of a light source temperature detection unit. The temperature of the base 2 or the heat sink 4 is related to the temperature of the light emitting element 3. Therefore, the light source temperature sensor 18 is attached to the base 2 or the heat sink 4, whereby the light source temperature can be detected. Alternatively, the light source temperature sensor 18 may be mounted on the light emitting element 3 itself. Information on the light source temperature detected by the light source temperature sensor 18 is input to the control unit 7 e. The control unit 7e can individually control the light source drive circuit 7a and the fan drive circuit 7b based on the information of the light source temperature detected by the light source temperature sensor 18.
The fan drive circuit 7b supplies electric power to the motor of the cooling fan 6 in accordance with a command from the control unit 7 e. The fan drive circuit 7b can adjust the rotation speed of the cooling fan 6 by adjusting at least one of the current, voltage, and frequency of the electric power supplied to the motor of the cooling fan 6. Hereinafter, the rotational speed of the cooling fan 6 is referred to as "fan speed". A fan speed sensor 19 that detects the fan speed is provided to the cooling fan 6. The fan speed sensor 19 is an example of a fan speed detection unit.
In the following description, the current value of the dc current supplied to the light emitting element 3 of the light source unit 17 is referred to as "light source current". Information on the fan speed detected by the fan speed sensor 19 is input to the control unit 7e via the fan drive circuit 7 b. The control unit 7e can control the light source current by controlling the light source driving circuit 7a based on the information of the fan speed detected by the fan speed sensor 19. The control unit 7e can control the light source current by controlling the light source driving circuit 7a based on the information of the light source temperature detected by the light source temperature sensor 18. The control unit 7e can control the fan speed of the cooling fan 6 by controlling the fan drive circuit 7b based on the information of the light source temperature.
Fig. 6 is a diagram showing a relationship among a light beam emitted from the light emitting element 3, a light source current, and a light source temperature. As shown in fig. 6, the light-emitting element 3 has the following characteristics. If the light source current is increased, the light beam is increased. When the light source current is equal, the light beam becomes larger under the condition that the light source temperature is low, as compared with the condition that the light source temperature is high. In order to obtain a predetermined light beam, it is necessary to control the light source current and control the light source temperature.
In the present embodiment, the control unit 7e controls the light source driving circuit 7a based on the information of the light source temperature, and can control both the light source current and the light source temperature. An example of the control will be described below.
Example 1 as described above, in order to obtain a predetermined light flux, it is necessary to control both the light source current and the light source temperature. For example, when the light source driving circuit 7a is controlled so that the light source current is constant, the light beam changes in accordance with a change in the light source temperature, and therefore the light source temperature needs to be constant. In this case, the control unit 7e can control the fan speed of the cooling fan 6 by the fan drive circuit 7b so that the light source temperature detected by the light source temperature sensor 18 becomes constant, thereby making the light source temperature constant. That is, the control unit 7e controls the light source drive circuit 7a and the fan drive circuit 7b so that the light source current is constant and the light source temperature is constant, thereby providing the illumination device 1A capable of obtaining a constant light flux. By obtaining a constant light flux, constant illuminance and brightness can be obtained. As a modification, the control unit 7e may control the cooling fan 6 to be turned on/off so that the light source temperature detected by the light source temperature sensor 18 is constant.
As another example, a case is assumed where the illumination device 1A is turned on in a range where the light source temperature is equal to or lower than a predetermined temperature. The predetermined temperature is a temperature within a temperature range in which the light emitting element 3 can be used, and when the light emitting element 3 is turned on at the predetermined temperature for a long time, a desired light beam can be obtained and a desired lifetime can be achieved. When the lighting device 1A is turned on in a range where the light source temperature is equal to or lower than the predetermined temperature, the control unit 7e controls the light source drive circuit 7a and the fan drive circuit 7b so that the light source current is lower as the light source temperature is lower and the light source current is higher as the light source temperature is higher, thereby obtaining a constant light flux. By obtaining a constant light flux, constant illuminance and brightness can be obtained. According to example 2, at least one of the operating time and the fan speed of the cooling fan 6 can be reduced. As a result, the life of the cooling fan 6 can be extended, and the reliability of the lighting device 1A can be further improved.
In a state where the control unit 7e instructs the cooling fan 6 to operate via the fan drive circuit 7b, when the fan speed detected by the fan speed sensor 19 is zero or extremely low, it is considered that the cooling fan 6 has failed due to, for example, aging or a lifetime. In this way, the control unit 7e can detect an abnormality of the cooling fan 6 such as a failure, degradation, or expiration of the life of the cooling fan 6.
When an abnormality of the cooling fan 6 is detected, the control unit 7e may control the light source driving circuit 7a so that the light source current is reduced as compared with a case where the abnormality of the cooling fan 6 is not detected. When an abnormality of the cooling fan 6 is detected, the control unit 7e may decrease the light source current so that the light source temperature detected by the light source temperature sensor 18 becomes equal to or lower than a predetermined temperature. With the above arrangement, when an abnormality occurs in the cooling fan 6, the light source temperature can be reliably prevented from increasing significantly, and therefore thermal degradation of the light emitting element 3 can be reliably prevented.
The control unit 7e may be configured to be capable of data communication with the terminal device 60. The terminal device 60 is configured to enable a user to remotely operate the lighting device 1A. The communication method between the control unit 7e and the terminal device 60 may be wired communication or wireless communication. The terminal device 60 includes an operation unit 61 for operation by a user and a display 62 for displaying characters, figures, characters, and the like to notify information. The terminal device 60 can transmit instructions related to, for example, turning on/off, dimming, and the like of the lighting device 1A to the control unit 7e in accordance with a user operation. For example, the operation unit 61 and the display 62 may be integrally formed by a touch panel. The display 62 is an example of a notification unit. The terminal device 60 may include other notification means such as a sound output device in addition to the display 62 or instead of the display 62. The terminal device 60 may be fixed to a wall of a room or the like. The terminal device 60 may be a portable mobile terminal. The terminal device 60 and the control unit 7e may be capable of direct communication. The terminal device 60 and the control unit 7e may communicate indirectly via another device or network such as a controller of a lighting control system.
The control unit 7e may control the light source driving circuit 7a and the fan driving circuit 7b based on information received from an environment sensor (not shown) that detects information about an environment in which the lighting device 1A is used or an environment in which light from the lighting device 1A is received. That is, the control unit 7e may control lighting, turning off, dimming, and the like of the light emitting element 3 or control the operation of the cooling fan 6 based on information detected by the environment sensor. The environment sensor may be at least one of an air temperature sensor for detecting an air temperature of the environment, a brightness sensor for detecting brightness of the environment, and a human detection sensor for detecting a human being in the environment. For example, the following arrangement is also possible.
The air temperature may be detected by an air temperature sensor as an environment sensor, and the control unit 7e may perform control so that the fan speed of the cooling fan 6 is higher when the air temperature is relatively high than when the air temperature is relatively low. The brightness of the environment may be detected by a brightness sensor as an environment sensor, and the control unit 7e may increase or decrease the light output from the lighting device 1A so that the brightness of the environment is constant. When a human detection sensor, which is an environment sensor, detects a human, the control unit 7e may turn on the lighting device 1A. When the human detection sensor does not detect a human, the control unit 7e may dim or turn off the lighting device 1A.
Fig. 7 is a cross-sectional view of a power supply device 7A provided in a modification of the illumination device 1A according to embodiment 1. The lighting device 1A may include a power supply device 7A shown in fig. 7 instead of the power supply device 7 shown in fig. 3. Hereinafter, a modification example including the power supply device 7A will be described with respect to differences from the above-described configuration. Fig. 7 is a sectional view at the same position as fig. 3. As shown in fig. 7, the power supply device 7A does not have the heat sink 7 m. The layout of the inside of the power supply casing 7d of the power supply device 7A is different from that of the power supply device 7. The heat generating electric element 7j is in contact with the inner surface of the upper wall 7p of the power supply housing 7d of the power supply device 7A via the heat conductive material 7 k. Heat generated from the electric element 7j is conducted to the upper wall 7p of the power supply housing 7d via the heat conductive material 7 k. As a modification, the electric element 7j may be in direct contact with the inner surface of the upper wall 7 p.
As shown in fig. 3, a part of the airflow generated by the cooling fan 6 is blown to the outer surface of the upper wall 7p of the power supply housing 7 d. Therefore, the upper wall 7p is easily cooled. According to the modification of fig. 7, heat generated from the electric element 7j can be conducted to the upper wall 7p which is easy to cool. Therefore, the temperature of the electric element 7j can be reduced, which is advantageous for improving the efficiency of the power supply device 7.
As shown in fig. 3, in the present embodiment, a space through which air can pass is formed between the cooling fan 6 and the power supply housing 7d when viewed from a direction perpendicular to the base center line BC. As a modification, the cooling fan 6 and the power supply housing 7d may be disposed so as to be in contact with each other without a gap when viewed from a direction perpendicular to the base center line BC. As a modification, the lighting device 1A may include a plurality of cooling fans 6. In this case, the center of each cooling fan 6 may be arranged to be rotationally symmetrical about the base center line BC.
Embodiment mode 2
Next, embodiment 2 will be described with reference to fig. 8 and 9, focusing on differences from embodiment 1 described above, and the description of the same or corresponding portions will be simplified or omitted. Fig. 8 is a perspective view of the lighting device 1B according to embodiment 2 as viewed from obliquely above. Fig. 9 is a plan view of the lighting device 1B of embodiment 2 as viewed from a direction perpendicular to the base 2. Fig. 9 shows a state in which the arm portion 9b of the body mount 9 is cut halfway and the fixing portion 9a is removed for easy observation. In fig. 9, the outer edge of the power supply housing 7d is indicated by a thick broken line for easy understanding of the position of the power supply housing 7 d.
As shown in fig. 8, the lighting device 1B according to embodiment 2 differs from the lighting device 1A according to embodiment 1 in the arrangement of the power supply device 7, the power supply support 8, and the fan support 12. Power supply device 7, power supply support 8, and fan support 12 of lighting device 1B are located at positions rotated by 90 degrees around base center line BC as compared with lighting device 1A.
As shown in fig. 9, when viewed from a direction perpendicular to the base 2, as described below. The rotational axis RA of the body support 9 passes through the center of the base 2. The center of the power supply housing 7d is located on the rotation axis RA. The distance between the center of the power supply housing 7d and the rotation axis RA is substantially zero. The distance in the direction parallel to the rotation axis RA between the center of the base 2 and the center of the power supply frame 7d is equal to the distance between the base center line BC and the power supply center line PC.
Since the power supply center line PC is offset from the base center line BC, the weight balance of the lighting device 1B is biased toward the power supply device 7. In a state where the lighting device 1B is mounted to the building through the body mount 9, the body of the lighting device 1B is fixed by the bolt 10 so as not to rotate with respect to the body mount 9. However, if the bolt 10 should loosen, the main body of the lighting device 1B may rotate around the rotation axis RA, and the main body of the lighting device 1B may tilt.
The position of the center of the power supply housing 7d can be considered to be substantially equal to the position of the center of gravity of the power supply device 7. Therefore, the weight of the power supply device 7 can be regarded as acting on the center of the power supply housing 7 d. According to the present embodiment, the center of the power supply housing 7d is positioned on the rotation axis RA when viewed from the direction perpendicular to the base 2, and the following effects can be obtained. The weight of the power supply device 7 is less likely to generate a rotational moment about the rotational axis RA. Therefore, even if the bolt 10 should loosen, the main body of the lighting device 1B does not rotate about the rotation axis RA, and the main body of the lighting device 1B can be reliably prevented from tilting.
As a modification, when the distance in the direction parallel to the rotation axis RA between the center of the base 2 and the center of the power supply housing 7d is longer than the distance between the center of the power supply housing 7d and the rotation axis RA when viewed from the direction perpendicular to the base 2, effects similar to the above-described effects can be obtained.
As shown in fig. 9, the entire power supply housing 7d is located inside the outer edge of the base 2 when viewed from the direction perpendicular to the base 2. This can provide the following effects. Since the substantial occupied space of the illumination device 1B can be reduced, the illumination device 1B can be disposed in a space-saving manner. Since the deterioration of the weight balance of the illumination device 1B can be prevented, the amplitude of the illumination device 1B at the time of an earthquake can be reduced, and the shock resistance can be further improved. Such a configuration and effect are common to embodiment 1 and embodiment 3 described later.
The power supply housing 7d has a shape having a longitudinal direction perpendicular to a direction connecting the center of the base 2 and the center of the power supply housing 7d when viewed from a direction perpendicular to the base 2. This can provide the following effects. The power supply housing 7d can be prevented from covering the upper side of the central region of the base 2, and the volume of the power supply housing 7d can be increased. The power supply housing 7d can be more reliably prevented from interfering with the airflow from the cooling fan 6 to the base 2 and the heat sink 4. Such a configuration and effect are also common to embodiment 1.
The area occupied by the cooling fan 6 when viewed in the direction perpendicular to the base 2 is divided into a first area 6a and a second area 6 b. The first region 6a is a region overlapping with the power supply housing 7d when viewed from a direction perpendicular to the base 2. In fig. 9, the first region 6a is hatched for ease of understanding. The second region 6b is a region that does not overlap the power supply housing 7d when viewed from a direction perpendicular to the base 2. In fig. 9, the second region 6b corresponds to a region not hatched in the occupied region of the cooling fan 6. The area of the second region 6b is larger than the area of the first region 6 a. With this configuration, the following effects can be obtained. As the ratio of the first region 6a is increased, the airflow to the power supply housing 7d is increased, and the airflow to the susceptor 2 and the heat sink 4 is decreased. Conversely, the larger the proportion of the second region 6b, the more the airflow to the base 2 and the heat sink 4 increases, and the less the airflow to the power supply housing 7d decreases. By making the area of the second region 6b larger than the area of the first region 6a, the airflow blowing to the susceptor 2 and the heat sink 4 can be sufficiently increased. Further, since the first region 6a in which the cooling fan 6 overlaps the power supply housing 7d is present, the airflow can be reliably blown to the power supply housing 7 d. The above-described configuration and effects are also common to embodiment 1.
Embodiment 3
Next, embodiment 3 will be described with reference to fig. 10 to 12, focusing on differences from the above-described embodiments, and the description of the same or corresponding portions will be simplified or omitted. Fig. 10 is a perspective view of the lighting device 1C according to embodiment 3, as viewed from obliquely above. Fig. 11 is a cross-sectional side view of the lighting device 1C of embodiment 3. Fig. 11 is a sectional view of a power supply device 7C provided in an illumination device 1C according to embodiment 3.
The lighting device 1C includes a base 2, a light emitting element 3, a plurality of heat sinks 4, a cooling fan 6, a power supply device 7C, and a power supply holder 20. As shown in fig. 10 and 11, the cooling fan 6 is disposed above the plurality of fins 4. The power supply device 7C is located above the cooling fan 6. The power supply device 7C includes a power supply housing 7q and an electronic circuit board 7C housed in the power supply housing 7 q.
As shown in fig. 10, the power supply device 7C is supported by the power supply support member 20. The power supply support member 20 supports the power supply device 7C on the base 2. The power support 20 has a leg portion 20a and a beam portion 20 b. The two leg portions 20a are disposed at positions opposite to each other with the center of the base 2 interposed therebetween. The lower end of each leg 20a is connected to the base 2. The leg portions 20a are disposed outside the heat sink 4. The beam portion 20b connects the upper ends of the two leg portions 20 a. The beam portion 20b is supported by the two leg portions 20 a. The beam portion 20b is arranged parallel to the base 2. The bottom of power supply frame 7q is fixed to the upper surface of beam 20 b. The longitudinal direction of the power supply frame 7q is parallel to the longitudinal direction of the beam portion 20b of the power supply support 20. Each arm portion 9b of the main body support 9 is located outside each leg portion 20a of the power supply support 20. This can provide the same effects as those of embodiment 1.
The cooling fan 6 is supported by a plurality of struts 21. Each of the support columns 21 has a lower end connected to the base 2 and an upper end connected to the cooling fan 6. The pillars 21 are disposed between the fins 4. The support columns 21 are disposed at the four corners of the square cooling fan 6 when viewed in the direction perpendicular to the base 2. As a modification, the power supply support member 20 may be configured to support the cooling fan 6 instead of the support column 21.
As described below, when viewed from a direction perpendicular to the base 2. The center of the cooling fan 6 is positioned in correspondence with the center of the base 2. The center of the power supply frame 7d is positioned to coincide with the center of the base 2. As a modification, the position of the center of the power supply housing 7d may be located at a position different from the center of the base 2 when viewed from the direction perpendicular to the base 2.
Fig. 11 is a sectional view taken along a plane passing through the center of the base 2 and perpendicular to the base 2. Fig. 11 is a sectional view taken along a plane perpendicular to the longitudinal direction of the beam portion 20b of the power source support member 20. As shown in fig. 11, the bottom surface of the cooling fan 6 is located higher than the upper end of the heat sink 4. A space exists between the bottom surface of the cooling fan 6 and the upper end of the heat sink 4. Fig. 12 is a sectional view taken at the same position as fig. 11.
As shown in fig. 12, when viewed from a direction perpendicular to the longitudinal direction of the beam portion 20b of the power source support 20, the following is described. The power supply frame 7q has a protruding portion 7r protruding outward from the edge 20c of the beam portion 20 b. The power supply casing 7q has two protrusions 7r located on opposite sides of the beam 20 b. The power supply frame body 7q has a width L1. Width L1 is the dimension of power supply frame 7q in the direction perpendicular to the longitudinal direction of beam 20b and parallel to base 2. Beam portion 20b has a width L2. Width L2 is the dimension of beam 20b in the direction perpendicular to the longitudinal direction of beam 20b and parallel to base 2. The width L1 of the power supply frame 7q is larger than the width L2 of the beam portion 20 b.
The power supply housing 7q has an air inlet 7s and an air outlet 7 t. The air inlet 7s and the air outlet 7t communicate the inside and the outside of the power supply housing 7 q. The air inlet 7s and the air outlet 7t are openings provided in a wall forming the power supply housing 7 q. The air inlet 7s and the air outlet 7t are formed in the protruding portion 7r of the power supply housing 7 q. The power supply casing 7q has an air inlet 7s formed in the upper surface of the power supply casing 7q and an air inlet 7s formed in the side surface of the power supply casing 7 q. The air outlet 7t is formed in a portion of the bottom surface of the power supply casing 7q which is not covered with the beam portion 20 b. The position of the air inlet 7s formed in the upper surface of the power supply housing 7q at least partially overlaps the position of the air outlet 7t formed in the bottom surface of the power supply housing 7q when viewed from the direction perpendicular to the base 2.
An electronic circuit board 7c having electric elements 7j and 7n and a heat sink 7u are disposed inside the power supply casing 7 q. The heat sink 7u includes a plate-shaped base portion that contacts the electric element 7j via the heat conductive material 7k, and a plurality of fins that protrude outward from the base portion. As a modification, the electric element 7j may be in direct contact with the base portion of the heat sink 7 u.
When the cooling fan 6 is operated, as described below. The airflow generated by the cooling fan 6 is schematically represented by the arrowed curve in fig. 11. The base 2 and the heat sink 4 are cooled by an air flow blown downward from the cooling fan 6. Air is sucked from above by the cooling fan 6, and flows through the air inlet 7s and the air outlet 7t inside the power supply casing 7 q. Air flows into the power supply housing 7q from the air inlet 7 s. The air flowing inside the power supply housing 7q is discharged from the air outlet 7t to the outside of the power supply housing 7 q. The air discharged from the air outlet 7t is drawn into the cooling fan 6.
According to the present embodiment, the following effects can be obtained. By flowing air inside the power supply housing 7q, the electric elements 7j, 7n of the electronic circuit board 7c located inside the power supply housing 7q can be efficiently cooled. Since the air discharged from the air outlet 7t of the power supply casing 7q can flow into the cooling fan 6, the air flow resistance of the air flow generated by the cooling fan 6 can be reduced. Therefore, the amount of air flow to the base 2 and the heat dissipation fins 4 increases, and the base 2 and the heat dissipation fins 4 can be efficiently cooled. As a comparative example, if the power supply housing 7q does not have the air inlet 7s and the air outlet 7t, the suction port of the cooling fan 6 is covered by the bottom surface of the power supply housing 7q, and the air flow resistance of the air flow generated by the cooling fan 6 tends to increase.
In the present embodiment, at least a part of the air outlet 7t is located at a position overlapping the cooling fan 6 when viewed from the direction perpendicular to the base 2. This can provide the following effects. The air discharged from the air outlet 7t of the power supply housing 7q can flow into the cooling fan 6 more smoothly. As a result, the flow rate of air passing through the inside of the power supply housing 7q increases. In addition, the air flow resistance of the air flow generated by the cooling fan 6 can be further reduced.
As shown in fig. 11, in the present embodiment, a space through which air can pass is formed between the cooling fan 6 and the power supply housing 7q when viewed in a direction parallel to the base 2. The air from this space is not passed through the inside of the power supply casing 7q and is sucked into the cooling fan 6. By providing this space, the air flow resistance of the air flow generated by the cooling fan 6 can be further reduced, and the air volume of the cooling fan 6 can be further increased.
As shown in fig. 10, each of the air inlet 7s and the air outlet 7t has an elongated shape extending along the longitudinal direction of the beam portion 20 b. This can provide the following effects. It is possible to reliably prevent large foreign matter from entering the inside of the power supply casing 7q from the air inlet 7s and the air outlet 7t, and to further increase the flow rate of air passing through the inside of the power supply casing 7 q.
According to the present embodiment, since the power supply device 7C includes the heat sink 7u, the electric element 7j can be cooled more efficiently. The air flowing into the power supply housing 7q from the air inlet 7s flows along the surface of the heat sink 7u, and is then discharged from the air outlet 7t to the outside of the power supply housing 7 q.
Description of the reference numerals
1A, 1B, 1C lighting devices; 2, a base; 3 a light emitting element; 4, radiating fins; 6a cooling fan; 7. 7A, 7C power supply devices; 7a light source driving circuit; 7b a fan drive circuit; 7c an electronic circuit substrate; 7d power supply frame body; 7e a control unit; 7f a processor; 7g of a memory; 7h a first side wall; 7i second side walls; 7j, 7n electrical elements; 7k of a thermally conductive material; a 7m heat sink; 7p upper wall; a 7q power supply frame body; a 7r projection; 7s air inlet; 7t air outlet; 7u radiator; 8a power supply support; 8a leg portion; 8b a beam portion; 9a body support; 9a fixing part; 9b an arm part; 9c long holes; 10, bolts; 11 rings; 12 a fan support; 13. 14 cables; 15 a light-transmitting cover; 17 a light source unit; 18 a light source temperature sensor; 19 a fan speed sensor; 20a power supply support; 20a leg portion; 20b a beam portion; 20c an edge; 21 a pillar; 60 terminal devices; 61 an operation section; 62 a display; 100 ac power.

Claims (46)

1. An illumination device, comprising:
a base;
a light emitting element disposed below the base;
a plurality of heat sinks arranged above the base;
a cooling fan that generates an air flow that cools the base and the plurality of heat sinks;
a power supply device having a light source drive circuit for lighting the light emitting elements and a power supply housing for housing the light source drive circuit;
a power supply support member that supports the power supply device on the base;
a main body support member that is coupled to a main body portion so as to be relatively rotatable and supports the main body portion, the main body portion including the base, the light emitting element, the plurality of heat radiating fins, the cooling fan, the power supply device, and the power supply support member; and
a fixing unit capable of fixing the body support to the body in a non-relative-rotation manner,
the power supply device is disposed above the plurality of heat sinks,
the cooling fan is disposed above the power supply device,
the base centerline is a straight line passing through the center of the base and perpendicular to the base,
the power supply central line is a straight line which passes through the center of the power supply frame body and is vertical to the base,
the power supply centerline is offset in position relative to the base centerline,
the power supply support has a leg coupled to the base,
the body support has an arm portion located outside the leg portion of the power supply support.
2. The lighting device of claim 1,
the center line of the base passes through the outer side of the power supply frame body.
3. The lighting device according to claim 1 or 2,
the power supply frame has a shape having a longitudinal direction perpendicular to a direction connecting a center of the base and a center of the power supply frame when viewed from a direction perpendicular to the base.
4. The lighting device according to claim 1 or 2,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the first sidewall either directly or via a thermally conductive material.
5. The lighting device according to claim 1 or 2,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat sink provided outside the first side wall of the power supply housing.
6. The lighting device according to claim 1 or 2,
the power frame has an upper wall forming an upper surface,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the upper wall, either directly or via a thermally conductive material.
7. The lighting device according to claim 1 or 2,
an occupied area of the cooling fan when viewed from a direction perpendicular to the base is divided into a first area and a second area,
the first region is a region overlapping with the power supply housing when viewed from a direction perpendicular to the base,
the second region is a region that does not overlap with the power supply housing when viewed from a direction perpendicular to the base,
the area of the second region is larger than the area of the first region.
8. The lighting device according to claim 1 or 2,
the plurality of fins are arranged in a radial shape when viewed from a direction perpendicular to the base.
9. The lighting device according to claim 1 or 2,
the entire power supply frame is located inside an outer edge of the base when viewed from a direction perpendicular to the base.
10. The lighting device according to claim 1 or 2,
the power supply device includes a fan drive circuit that drives the cooling fan, and the fan drive circuit is housed in the power supply housing.
11. The lighting device according to claim 1 or 2,
the lighting device is provided with:
a fan drive circuit that drives the cooling fan;
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit and the fan driving circuit,
the control unit controls the light source driving circuit to make a current value of the light emitting element, i.e., a light source current, constant, and controls the operation of the cooling fan to make the light source temperature constant.
12. The lighting device according to claim 1 or 2,
the lighting device is provided with:
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit,
the control unit controls the light source drive circuit such that the lower the light source temperature, the lower the light source current, which is the current value of the light emitting element, and the higher the light source temperature, the higher the light source current.
13. An illumination device, comprising:
a base;
a light emitting element disposed below the base;
a plurality of heat sinks arranged above the base;
a cooling fan disposed above the plurality of heat sinks and generating an air flow for cooling the base and the plurality of heat sinks;
a power supply device which has a light source drive circuit for lighting the light emitting element and a power supply housing for housing the light source drive circuit, and which is positioned above the cooling fan; and
a power supply support member supporting the power supply device to the base,
the power supply support member has a leg portion coupled to the base and a beam portion supported by the leg portion and fixed to the power supply frame,
the power supply frame body is provided with an air inlet and an air outlet which enable the interior of the power supply frame body to be communicated with the exterior,
the power supply frame has a protruding portion protruding outward from an edge of the beam portion when viewed in a direction perpendicular to a longitudinal direction of the beam portion,
the air inlet and the air outlet are formed in the protruding portion of the power supply frame body.
14. The lighting device of claim 13,
when the cooling fan is operated, air flows through the air inlet and the air outlet inside the power supply casing.
15. The lighting device of claim 13 or 14,
the air inlet and the air outlet each have an elongated shape extending in a longitudinal direction of the beam portion.
16. The lighting device of claim 13 or 14,
the power supply device includes:
a heat generating electric element disposed inside the power supply housing; and
and a heat sink disposed inside the power supply housing and in contact with the electric element directly or via a heat conductive material.
17. The lighting device of claim 13 or 14,
the lighting device is provided with:
a main body support member that is coupled to a main body portion so as to be relatively rotatable and supports the main body portion, the main body portion including the base, the light emitting element, the plurality of heat radiating fins, the cooling fan, the power supply device, and the power supply support member; and
a fixing unit capable of fixing the body support to the body in a non-relative-rotation manner,
the power supply support has a leg coupled to the base,
the body support has an arm portion located outside the leg portion of the power supply support.
18. The lighting device of claim 13 or 14,
the plurality of fins are arranged in a radial shape when viewed from a direction perpendicular to the base.
19. The lighting device of claim 13 or 14,
the entire power supply frame is located inside an outer edge of the base when viewed from a direction perpendicular to the base.
20. The lighting device of claim 13 or 14,
the power supply device includes a fan drive circuit that drives the cooling fan, and the fan drive circuit is housed in the power supply housing.
21. The lighting device of claim 13 or 14,
the lighting device is provided with:
a fan drive circuit that drives the cooling fan;
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit and the fan driving circuit,
the control unit controls the light source driving circuit to make a current value of the light emitting element, i.e., a light source current, constant, and controls the operation of the cooling fan to make the light source temperature constant.
22. The lighting device of claim 13 or 14,
the lighting device is provided with:
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit,
the control unit controls the light source drive circuit such that the lower the light source temperature, the lower the light source current, which is the current value of the light emitting element, and the higher the light source temperature, the higher the light source current.
23. An illumination device, comprising:
a base;
a light emitting element disposed below the base;
a plurality of heat sinks arranged above the base;
a cooling fan that generates an air flow that cools the base and the plurality of heat sinks;
a power supply device having a light source drive circuit for lighting the light emitting elements and a power supply housing for housing the light source drive circuit;
a power supply support member that supports the power supply device on the base;
a main body support member that is coupled to a main body portion so as to be relatively rotatable and supports the main body portion, the main body portion including the base, the light emitting element, the plurality of heat radiating fins, the cooling fan, the power supply device, and the power supply support member; and
a fixing unit capable of fixing the body support to the body in a non-relative-rotation manner,
the power supply device is disposed above the plurality of heat sinks,
the cooling fan is disposed above the power supply device,
the base centerline is a straight line passing through the center of the base and perpendicular to the base,
the power supply central line is a straight line which passes through the center of the power supply frame body and is vertical to the base,
the power supply centerline is offset in position relative to the base centerline,
the body support axis of rotation is the axis of rotation of the body support relative to the body,
a distance between the center of the base and the center of the power supply frame in a direction parallel to the body support rotation axis is longer than a distance between the center of the power supply frame and the body support rotation axis when viewed from a direction perpendicular to the base.
24. The lighting device of claim 23,
the center line of the base passes through the outer side of the power supply frame body.
25. The lighting device of claim 23 or 24,
the power supply frame has a shape having a longitudinal direction perpendicular to a direction connecting a center of the base and a center of the power supply frame when viewed from a direction perpendicular to the base.
26. The lighting device of claim 23 or 24,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the first sidewall either directly or via a thermally conductive material.
27. The lighting device of claim 23 or 24,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat sink provided outside the first side wall of the power supply housing.
28. The lighting device of claim 23 or 24,
the power frame has an upper wall forming an upper surface,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the upper wall, either directly or via a thermally conductive material.
29. The lighting device of claim 23 or 24,
an occupied area of the cooling fan when viewed from a direction perpendicular to the base is divided into a first area and a second area,
the first region is a region overlapping with the power supply housing when viewed from a direction perpendicular to the base,
the second region is a region that does not overlap with the power supply housing when viewed from a direction perpendicular to the base,
the area of the second region is larger than the area of the first region.
30. The lighting device of claim 23 or 24,
the plurality of fins are arranged in a radial shape when viewed from a direction perpendicular to the base.
31. The lighting device of claim 23 or 24,
the entire power supply frame is located inside an outer edge of the base when viewed from a direction perpendicular to the base.
32. The lighting device of claim 23 or 24,
the power supply device includes a fan drive circuit that drives the cooling fan, and the fan drive circuit is housed in the power supply housing.
33. The lighting device of claim 23 or 24,
the lighting device is provided with:
a fan drive circuit that drives the cooling fan;
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit and the fan driving circuit,
the control unit controls the light source driving circuit to make a current value of the light emitting element, i.e., a light source current, constant, and controls the operation of the cooling fan to make the light source temperature constant.
34. The lighting device of claim 23 or 24,
the lighting device is provided with:
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit,
the control unit controls the light source drive circuit such that the lower the light source temperature, the lower the light source current, which is the current value of the light emitting element, and the higher the light source temperature, the higher the light source current.
35. An illumination device, comprising:
a base;
a light emitting element disposed below the base;
a plurality of heat sinks arranged above the base;
a cooling fan that generates an air flow that cools the base and the plurality of heat sinks; and
a power supply device having a light source drive circuit for lighting the light emitting element and a power supply housing for housing the light source drive circuit,
the power supply device is disposed above the plurality of heat sinks,
the cooling fan is disposed above the power supply device,
the base centerline is a straight line passing through the center of the base and perpendicular to the base,
the power supply central line is a straight line which passes through the center of the power supply frame body and is vertical to the base,
the power supply centerline is offset in position relative to the base centerline,
blowing the airflow downward from the cooling fan,
a part of the airflow generated by the cooling fan is blown to an outer surface of an upper wall of the power supply frame,
a space through which air can pass is formed between the cooling fan and the upper wall of the power supply casing when viewed in a direction perpendicular to the center line of the base.
36. The lighting device of claim 35,
the center line of the base passes through the outer side of the power supply frame body.
37. The lighting device of claim 35 or 36,
the power supply frame has a shape having a longitudinal direction perpendicular to a direction connecting a center of the base and a center of the power supply frame when viewed from a direction perpendicular to the base.
38. The lighting device of claim 35 or 36,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the first sidewall either directly or via a thermally conductive material.
39. The lighting device of claim 35 or 36,
the power supply frame body has a first side wall forming a first side surface and a second side wall forming a second side surface opposite to the first side surface,
the distance between the first side wall and the central line of the base is smaller than the distance between the second side wall and the central line of the base,
the power supply device includes a heat sink provided outside the first side wall of the power supply housing.
40. The lighting device of claim 35 or 36,
the power frame has an upper wall forming an upper surface,
the power supply device includes a heat-generating electric element disposed inside the power supply housing,
the electrical element is in contact with the inner surface of the upper wall, either directly or via a thermally conductive material.
41. The lighting device of claim 35 or 36,
an occupied area of the cooling fan when viewed from a direction perpendicular to the base is divided into a first area and a second area,
the first region is a region overlapping with the power supply housing when viewed from a direction perpendicular to the base,
the second region is a region that does not overlap with the power supply housing when viewed from a direction perpendicular to the base,
the area of the second region is larger than the area of the first region.
42. The lighting device of claim 35 or 36,
the plurality of fins are arranged in a radial shape when viewed from a direction perpendicular to the base.
43. The lighting device of claim 35 or 36,
the entire power supply frame is located inside an outer edge of the base when viewed from a direction perpendicular to the base.
44. The lighting device of claim 35 or 36,
the power supply device includes a fan drive circuit that drives the cooling fan, and the fan drive circuit is housed in the power supply housing.
45. The lighting device of claim 35 or 36,
the lighting device is provided with:
a fan drive circuit that drives the cooling fan;
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit and the fan driving circuit,
the control unit controls the light source driving circuit to make a current value of the light emitting element, i.e., a light source current, constant, and controls the operation of the cooling fan to make the light source temperature constant.
46. The lighting device of claim 35 or 36,
the lighting device is provided with:
a light source temperature detection unit that detects a light source temperature that is a temperature related to a temperature of the light emitting element; and
a control unit which controls the light source driving circuit,
the control unit controls the light source drive circuit such that the lower the light source temperature, the lower the light source current, which is the current value of the light emitting element, and the higher the light source temperature, the higher the light source current.
CN201780091019.3A 2017-07-14 2017-07-14 Lighting device Active CN110914592B (en)

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JP5746897B2 (en) * 2011-04-07 2015-07-08 扶桑電機工業株式会社 LED lighting device
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