LIQUID-COOLED LED LIGHTING DEVICE

• US 20100264826A1
• Filed: 03/19/2010
• Published: 10/21/2010
• Est. Priority Date: 04/15/2009
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Hiramoto, Yasushi, Yatsuda, Yasushi, Koike, Teruo
• Granted Patent: US 8,419,249 B2
• Time in Patent Office: Days
• US Class Current: 315/112
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 45/43 using gas
• CPC Class Codes: F21S 45/46 using liquid
• CPC Class Codes: F21V 29/56 using liquid coolants F21V29/51 takes precedence
• CPC Class Codes: F21V 29/58 characterised by the coolants
• CPC Class Codes: F21V 29/673 the fans being used for intake
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/80 with pins or wires
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 23/473 by flowing liquids H01L23/4332, H01L23/4338 take precedence
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A cooling liquid can be circulated in a liquid cooling system, so that a light source unit and a control unit can be forcedly cooled by the cooling liquid. Thus, a temperature increase in these components can be suppressed, thereby achieving an increase in the output power of a liquid-cooled LED lighting device. The liquid-cooled LED lighting device can include a housing, a light source unit having LEDs as light sources, a liquid cooling system, and a control unit to control the light source unit to be turned on. The liquid cooling system can include a heat receiving jacket, a radiator, a circulation pump and a fan. The light source unit and the control unit can be disposed with the heat receiving jacket of the liquid cooling system interposed therebetween. Further, one surface of the control unit can be brought in close contact with the heat receiving jacket while a heat radiation portion (e.g., fins or pins) can be provided at an other surface of the control unit.

Claims

1. A liquid-cooled LED lighting device, comprising:

a light source unit including an LED as a light source;

a liquid cooling system including a heat receiving jacket and a radiator; and

a control unit configured to control the light source unit to be turned on, wherein

the light source unit and the control unit are disposed with the heat receiving jacket of the liquid cooling system interposed therebetween.

2. The liquid-cooled LED lighting device according to claim 1, wherein one surface of the control unit is in close and direct contact with the heat receiving jacket and a heat radiation portion is provided at an other surface of the control unit.

3. The liquid-cooled LED lighting device according to claim 1, wherein the light source unit is in close contact with the heat receiving jacket via a heat conduction sheet.

4. The liquid-cooled LED lighting device according to claim 1, wherein the heat receiving jacket and the radiator of the liquid cooling system are separated away from each other to define a space portion therebetween, and the control unit is located within the space portion.

17. The liquid-cooled LED lighting device according to claim 1, wherein the light source unit includes a base, and the base includes an LED mounting portion on one surface of the base and a ventilation hole formed through the base such that air can pass from one side of the base to an opposite side of the base.

20. The liquid-cooled LED lighting device according to claim 1, wherein the heat receiving jacket includes an inlet structure, a discharge structure, and a liquid located in the heat receiving jacket.

5. A liquid-cooled LED lighting device comprising:

a housing including an inlet port and a discharge port whose axes are disposed perpendicular to each other;

a light source unit including an LED as a light source; and

a liquid cooling system including a heat receiving jacket, a radiator, and a fan, wherein

the housing accommodates the light source unit and at least the radiator and the fan of the liquid cooling system, the radiator and the fan being separated away from the heat receiving jacket to define a space portion therebetween, and

an air passage configured to allow cooling air to partly pass therethrough and formed so that the cooling air is sucked from the inlet port into the housing by the fan and flows along an inner surface of the housing and through the space portion and the radiator, and then exhausted from the discharge port of the housing to an outside area.

6. The liquid-cooled LED lighting device according to claim 5, wherein the inlet port is formed in a side wall of the housing, the discharge port is formed in an end wall of the housing located in a direction opposite to a light emission direction of the LED, and the radiator and the fan are disposed adjacent the discharge port.

7. A liquid-cooled LED lighting device comprising:

a light source unit including an LED as a light source, a base on which the LED is mounted, a light-transmitting cover disposed in front of the LED in a light emission direction of the LED;

a liquid cooling system including a heat receiving jacket and a radiator; and

a control unit configured to control the light source unit to be turned on, wherein

the base includes an LED mounting portion on one surface of the base and a ventilation hole formed through the base, and

the heat receiving jacket of the liquid cooling system is in close contact with an other surface of the base except for an area where the ventilation hole is formed.

8. The liquid-cooled LED lighting device according to claim 7, wherein the ventilation hole is formed in a tubular form to project completely through the heat receiving jacket of the liquid cooling system, and the heat receiving jacket includes a liquid cooling portion surrounding the ventilation hole.

9. The liquid-cooled LED lighting device according to claim 7, wherein the light source unit is in close contact with the heat receiving jacket via a heat conduction sheet.

10. The liquid-cooled LED lighting device according to claim 7, wherein the heat receiving jacket and the radiator of the liquid cooling system are separated away from each other to define a space portion, and the control unit is located within the space portion.

11. A liquid-cooled LED lighting device comprising:

a light source unit including an LED as a light source;

a liquid cooling system including a heat receiving jacket and a radiator; and

an air cooling unit including a heat sink disposed adjacent the light source unit.

12. The liquid-cooled LED lighting device according to claim 11, further comprising a circuit casing disposed in close contact with the heat receiving jacket of the liquid cooling system, wherein the heat sink of the air cooling unit is formed in the circuit casing and includes at least one of a heat dissipation pin and a heat dissipation fin.

13. The liquid-cooled LED lighting device according to claim 11, wherein the heat sink of the air cooling unit is formed in the heat receiving jacket of the liquid cooling system, and includes at least one of a heat dissipation pin and a heat dissipation fin.

14. The liquid-cooled LED lighting device according to claim 11, further comprising a control unit, and wherein the control unit is configured such that when the liquid cooling system cannot properly operate, the control unit controls a current to be supplied to the light source unit to a given value or less so that heat generated from the light source unit can be absorbed by the air cooling unit.

15. The liquid-cooled LED lighting device according to claim 11, wherein the light source unit and the air cooling unit are disposed with the heat receiving jacket of the liquid cooling system interposed therebetween.

16. The liquid-cooled LED lighting device according to claim 11, further comprising a fan, and wherein the heat receiving jacket of the liquid cooling system, the air cooling unit, the radiator of the liquid cooling system, and the fan are arranged in that order from a side of the light source unit.

18. The liquid-cooled LED lighting device according to claim 11, wherein the light source unit includes a base, and the base includes an LED mounting portion on one surface of the base and a ventilation hole formed through the base such that air can pass from one side of the base to an opposite side of the base.

19. The liquid-cooled LED lighting device according to claim 11, wherein the heat receiving jacket includes an inlet structure, a discharge structure, and a liquid located in the heat receiving jacket, and the air cooling unit includes a fan.