Method and system for controlling fan rotating speed of LED lamp, and LED lamp thereof

• US 10,225,949 B2
• Filed: 12/06/2017
• Issued: 03/05/2019
• Est. Priority Date: 12/06/2016
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: GE Lighting Solutions LLC (Savant Systems, LLC)
• Inventors: Fang, Min, Long, Qi, Shan, Liang, Qin, Shuyi, Li, Yong
• Primary Examiner(s): Haughton, Anthony M
• Assistant Examiner(s): Gafur, Razmeen
• Application Number:
  US15/833,568
• Publication Number:
  US 20180160564A1
• Time in Patent Office: 454 Days
• Field of Search: 361676-678, 36167946-67954, 361688-723, 165 801- 805, 16510433, 165185, 174 151- 153, 174 161- 163, 174547, 174548, 257712-722, 257E23088, 24453, 24458-459, 454184, 312236
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: F04D 27/008 Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 19/0015 Fastening arrangements intended to retain light sources
• CPC Class Codes: F21V 29/61 characterised by control arrangements
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05K 7/20136 Forced ventilation, e.g. by fans H05K7/202 takes precedence
• CPC Class Codes: H05K 7/20209 Thermal management, e.g. fan control
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A method for controlling the rotational speed of a fan of an LED lamp, comprising: presetting a corresponding relationship between a voltage, a current and a temperature for an LED chip in the LED lamp in the controller, as well as presetting a corresponding relationship between the temperature of LED chip and the speed of the fan in the controller, measuring the voltage and current of the LED chip, obtaining the current calculated temperature of the LED chip through the measured voltage and current, and further determining the current desired fan speed through the obtained current calculated temperature, using the controller to control the fan to rotate at the current desired speed, thereby cooling the LED chip. Additionally a corresponding system for controlling the rotational speed of the fan of an LED lamp and an LED lamp including the system.

Claims

1. A method for controlling a rotate speed of a fan for a LED lamp, comprising:

presetting in a controller a corresponding relationship among voltage, current and temperature of a LED chip of the LED lamp;

presetting in the controller a corresponding relationship between temperature of the LED chip and rotate speed of the fan;

measuring a voltage value of the LED chip;

measuring a current value of the LED chip;

determining a calculated temperature value of the LED chip based on the measured voltage value, the measured current value and the corresponding relationship among voltage, current and temperature of the LED chip, by the controller;

determining a needed rotate speed value of the fan based on the calculated temperature value and the corresponding relationship between temperature of the LED chip and rotate speed of the fan, by the controller; and

controlling the fan to rotate at the needed rotate speed value, by the controller.

2. The method according to claim 1, wherein the fan is controlled by the controller to rotate at the needed rotate speed value in a continuous control mode.

3. The method according to claim 1, wherein the fan is controlled by the controller to rotate at the needed rotate speed value in a step-by-step control mode.

4. The method according to claim 3, further comprising:

presetting in the controller a minimum preset value of the calculated temperature, a maximum preset value of the calculated temperature, a minimum temperature range comprising temperature values smaller than the minimum preset value, a maximum temperature range comprising temperature values greater than the maximum preset value, and one or more speed control temperature ranges between the minimum preset value and the maximum preset value;

presetting corresponding fan rotate speeds corresponding to the minimum temperature range, the maximum temperature range and the one or more speed control temperature ranges respectively, in the controller;

determining the temperature range which the calculated temperature value is in, at set intervals, by the controller;

shutting down the fan by the controller, when the calculated temperature value is in the minimum temperature range;

controlling the fan to rotate at the highest rotate speed by the controller, when the calculated temperature value is in the maximum temperature range; and

controlling the fan to rotate at the rotate speed corresponding to the temperature range which the calculated temperature value is in, by the controller, when the calculated temperature value is in one of the one or more speed control temperature ranges.

5. The method according to claim 4, wherein the set interval is in a range from 0.01 second to 10 seconds.

6. A system for controlling a rotate speed of a fan for cooling a LED chip of a LED lamp, comprising:

a voltage measurement unit for measuring a voltage value of the LED chip;

a current measurement unit for measuring a current value of the LED chip;

a controller coupled with the voltage measurement unit and the current measurement unit, for controlling the rotate speed of the fan, wherein;

the controller is preset with a corresponding relationship among voltage, current and temperature of the LED chip, and a corresponding relationship between temperature of the LED chip and rotate speed of the fan, and

the controller is configured to determine a calculated temperature value of the LED chip based on the voltage value measured by the voltage measurement unit, the current value measured by the current measurement unit and the corresponding relationship among voltage, current and temperature of the LED chip, to determine a needed rotate speed value of the fan based on the calculated temperature value and the corresponding relationship between temperature of the LED chip and rotate speed of the fan, and to control the fan to rotate at the needed rotate speed value.

7. The system according to claim 6, wherein the controller is configured to control the fan to rotate at the needed rotate speed value in a continuous control mode.

8. The system according to claim 6, wherein the controller is configured to control the fan to rotate at the needed rotate speed value in a step-by-step control mode.

9. The system according to claim 8, wherein

the controller is preset with a minimum preset value of the calculated temperature, a maximum preset value of the calculated temperature, a minimum temperature range comprising temperature values smaller than the minimum preset value, a maximum temperature range comprising temperature values greater than the maximum preset value, and one or more speed control temperature ranges between the minimum preset value and the maximum preset value;

the controller is preset with corresponding fan rotate speeds corresponding to the minimum temperature range, the maximum temperature range and the one or more speed control temperature ranges respectively;

the controller is configured to;

determine which temperature range of the calculated temperature value is in at set intervals;

shut down the fan, when the current calculated temperature value is in the minimum temperature range;

control the fan to rotate at the highest rotate speed, when the current calculated temperature value is in the maximum temperature range; and

control the fan to rotate at the rotate speed corresponding to the temperature range which the calculated temperature value is in, when the current calculated temperature value is in one of the one or more speed control temperature ranges.

10. The system according to claim 9, wherein the set interval is in a range from 0.01 second to 10 seconds.

11. A LED lamp, comprising:

a LED chip;

a fan for cooling the LED chip of the LED lamp; and

a system for controlling a rotate speed of the fan, the system comprising;

a voltage measurement unit for measuring a voltage value of the LED chip;

a current measurement unit for measuring a current value of the LED chip;

a controller coupled with the voltage measurement unit and the current measurement unit, for controlling the rotate speed of the fan, wherein;

the controller is preset with a corresponding relationship among voltage, current and temperature of the LED chip, and a corresponding relationship between temperature of the LED chip and rotate speed of the fan, and

the controller is configured to determine a calculated temperature value of the LED chip based on the voltage value measured by the voltage measurement unit, the current value measured by the current measurement unit and the corresponding relationship among voltage, current and temperature of the LED chip, to determine a needed rotate speed value of the fan based on the calculated temperature value and the corresponding relationship between temperature of the LED chip and rotate speed of the fan, and to control the fan to rotate at the needed rotate speed value.