TW201039694A - Illumination device and control method thereof - Google Patents

Abstract

An illumination device and a control method thereof are provided. The illumination device includes a thermal sensor, a light emitting diode module (LED module) for emitting light. The control method including following steps: enabling the thermal sensor to detect an environment temperature of the outside of the illumination device; and comparing the environment temperature with a threshold value, wherein if the environment temperature is higher than the threshold value, the driving current of the LED module is reduced and the thermal sensor is disabled within a continued time period.

Description

201039694 ... 30452twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a lighting device, and more particularly to a lighting diode lighting device and a control method therefor. [Prior Art] The price of a light-emitting diode (LTM) is still quite expensive, and the LED module used in a light-emitting diode lamp usually includes more than one. Light-emitting diode. In a light-emitting diode lamp, the cost of the light-emitting diode module is quite expensive. Some LED modules use passive cooling mechanisms such as heat sinks or heat sink fins. Some LED modules use an active cooling mechanism, such as a fan or a cooling chip, to maintain the LED module at the proper operating temperature. A suitable over-temperature protection design can also be added to prevent the LED module from burning out. The Republic of China No. 1294372 discloses a method for protecting a light-emitting diode module and a /3!1 method for detecting and judging whether the temperature inside the lamp housing exceeds a predetermined value. If D, the brightness of the current illumination mode is lowered, and then the temperature is detected. If the temperature has fallen below the predetermined value, the full brightness is adjusted back. 'Mr. Republic of China No. M325439 discloses a brightness-adjustable light-emitting body lamp circuit' lamp body temperature detecting unit that uses a thermistor to measure the temperature inside the lamp body, and then determines whether or not the light-emitting diode output control unit determines whether Reduce the current output to the LED module. Another conventional technique for the over-temperature protection of the LED module is that when the temperature sensor detects that the temperature in the lamp body is too high, the LED module 2 201039694 FI 1^3() -50432twf.d〇c/n The power supply is disconnected, and the LED module stops emitting light. The method of over-temperature protection of the light-emitting diode module of the prior art is to change the driving current of the light-emitting diode module according to the temperature-sensing cost to adjust the temperature of the light-emitting diode module. However, the above conventional techniques do not take into account the relationship between the illuminating diode lamp and the ambient temperature. In addition, the LED module has some disadvantages when it is subjected to over-temperature protection. For example, the sudden light source of the LED lamp is turned off, which makes the user's money less than the accident. The illuminance of the illuminating diode module continuously changes and flickers in a short time, which makes the user feel uncomfortable. Since the temperature affects the lifetime and brightness of the LED components. If the passive diode lamp adopts passive heat dissipation, it is to radiate heat by natural convection and heat conduction. The heat sink needs a considerable volume and weight, which is a heavy burden for the manufacturer of the light-emitting diode lamp. For the design of the illuminating diode lamp, it is necessary to take into account the safety of the user, the heat dissipation problem of the illuminating diode lamp, and the overall relationship between the illuminating diode lamp and the ambient temperature. For LED manufacturers, how to improve is a very important issue. SUMMARY OF THE INVENTION The present invention provides a control method for a lighting device to achieve the function of over-temperature protection of a light-emitting diode module and stable light source intensity. The invention provides a lighting device for achieving the function of over-temperature protection and stable light source intensity of the LED module. 201039694 i i^jo 3〇452twf.doc/n Other objects and advantages of the present invention will be further understood from the technical features disclosed herein. ❹

O. For one or a part or all of the above or other purposes, the embodiment of the present invention provides a control method for a lighting device, the lighting device comprising a temperature sensor and a light emitting diode module for emitting light. The control method includes: = can sense the temperature H', then the external temperature of the Wei; and compare the ambient temperature with the acid. When the ambient temperature is greater than the time, the LED module is lowered during a continuous period of time. Drive current, and then adjust the light-emitting diode module to reduce the radiance of the LED module for the duration of the phantom =; true =: the pole; the body. The temperature sensor is used to detect the outside of the lighting device The squeezing and consuming power consumption is connected to the LED module. The driver is suitable for the temperature of the environment detected by the squaring device (the tempering device). 'After a duration, the device continues to Dn; the driving current of the t-pole module, and the temperature of the ambient temperature outside the device. The change signal, 丄 the above two: 5 The drive current is - pulse width down drive current., "1 ' way to adjust pulse width guard The periodic mode is adjusted in an embodiment of the present invention, and the rated driving current of the illuminating diode module is equal to or smaller than 5 201039694 PT1536 30452 twf.doc/n. The environment detected by the temper in one embodiment of the present invention The amplitude of the temperature and the flow is reduced. The above control circuit is adapted to determine the driving power according to the difference between the sense A values in the present invention - the actual day (four) is from the present hair - the real off, _ ' ' ^ ^ degree display, temperature display _ control circuit fox in an embodiment of the invention, in the pull of the wrestler, . ', not brother, the degree. The circuit is suitable for re-energizing the temperature ϋ. In the embodiment of the present invention, in the embodiment of the present invention, the re-energizing temperature is small and the temperature is small, and the circuit is suitable for (4) _ ^ = the rated drive wire of the body module drives the light-emitting diode In the embodiment of the present invention, the illumination assembly and the temperature display H. The memory is coupled to the (four) circuit for eating the temperature, and the temperature display (10) is connected to the control circuit. Used to display the ambient temperature recorded by the memory L. When the temperature is detected, the environment detected by I When the degree is greater than the ambient temperature recorded by the memory, the control circuit is adapted to update the ambient temperature recorded by the memory with the detected ambient temperature. In the above embodiment of the present invention, the control circuit detects The ambient temperature outside the illuminating device adjusts the driving current provided by the driver, and controls the illuminating brightness of the illuminating diode module. Therefore, it can generate a mechanism for over-temperature protection of the diode and provide stable Light-emitting diode light source to illuminate the application site to avoid the danger caused by flickering phenomenon or sudden change of light source. ' 201039694 j〇452twf.doc/n [Embodiment] The foregoing and other technical contents related to the present invention The features and functions will be apparent from the following detailed description of embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional term used is used to describe that it is not intended to limit the invention. o

Subsequent descriptions of the invention are generally directed to embodiments and methods. It is understood that the invention is not intended to be limited to the particular disclosed embodiments and methods, but the invention may be practiced with other features, elements, methods and embodiments. The examples are described to illustrate the invention and not to limit its scope, which is defined by the scope of the claims. Various equivalent variations will be apparent to those skilled in the art in the following description. Similar elements in the various embodiments are collectively referred to by like reference numerals. In the embodiments described below, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element. In contrast, when a component is referred to as a "straight I connection" or a "direct face connection" to another component, there is no

Xi Jin./ Come. A Figure 1 is a block diagram showing a lighting device of the present invention. The main inflammation is shown in Figure 1. The illumination device 100 includes a light emitting diode module 11A, a crying 120, a driver 130, and a control circuit 140. The light-emitting diode mold includes at least one light-emitting diode. A ^ GND of the LED module u〇. Sense; Zhai 120 is used to measure the production and degree of lighting outside the i〇Q. The driver 130 is connected to the voltage VCC and the light-emitting diode module 2 201039694

Fll^6 3U452twf.d〇c/n Private road 140.駆动斋i3〇 is used to drive the LED module, the group is illuminated, and the circuit 140 is connected to the sensing temperature|| 12〇 and the driver for receiving the temperature 120 of the temperature sensor Signal, and control the operation of the temperature sensor 1; 2 〇 and the driver 13 。. Figure 2 is a flow chart showing the control method of the embodiment of Figure 1 of the present invention. In Fig. 2, the control method includes the following steps. In step s21, the driver B G drives the LED module 110 to emit light with the rated driving current of the LED group. The rated drive current here means the step-down = electrokinetic 'light-emitting illuminator--the driving current value of the polar body module 11Q, the amount of current is usually determined by the manufacturer of Wei Er New (10) after following the relevant female full specifications. Set. In step S220, the control circuit 14 turns on the temperature sensor 12A to detect the soil temperature Ta outside the farm. The temperature sensor 120 of the present embodiment knows the temperature sensor used by the technology. The difference lies in the area where the temperature is detected. Considering that the lighting device (10) and the lighting environment of the lighting device 100 are suitable for detecting the ambient temperature outside the lighting device, the temperature sensor used by the white sensing technology is the detecting light fixture. The temperature of the internal portion is then proceeded to step S23G, and the control circuit 14G compares the threshold value of the temperature range Ta of the temperature sensor 120, J, and the preset temperature to a predetermined upper temperature limit; when the bottle state 120 is detected When the ambient temperature τ & is greater than the threshold value, the track is "240", otherwise, the process returns to step S21, and the light-emitting diode module is driven to emit light by the rated current of the light-emitting diode module. The setting of the threshold Tth of the upper limit of the dish is set according to the overall temperature of the lighting device and the application environment of the lighting device 100, or allows the maintenance personnel of the lighting device 100 to set it by itself. For example, when The environment in which the lighting device is applied is at a temperature _2 (rc~4 (rc), the heat dissipation mechanism of the LED module 110 can maintain the LED module 110 at a safe operating temperature. When the illumination device 100 is applied to an ambient temperature of 4 (rc~8 ( In rc, the heat dissipation mechanism of the light-emitting diode module 110 is measured to reduce the power of the light-emitting diode. If the temperature exceeds t = ❹, the heat dissipation mechanism cannot maintain the LED module 110. At a safe working temperature, the threshold Tth of the upper temperature limit is set at 8 (rc. It is known in the art that the threshold Tth is set according to the heat dissipation capability of the lighting device 1 and the application environment. The setting is not limited by the above embodiments. In step = S240, the ambient temperature Ta is greater than the threshold value Tth. Thus, within the segment duration Tcont, the control circuit 14 adjusts the driver 13 for driving the illumination The driving current of the diode module 11〇 is turned off and the temperature sensor is turned off within the duration Tc〇nt to stop detecting the % temperature Ta of the illumination device 1 to regulate the LED mode. Group 11 () temperature. The reserve value is set at 80 ° C, and when the ambient temperature is Ta After 80 = day, the control circuit 140 lowers the driving current 丨. After the driving current 调 is lowered, the luminous intensity of the LED 11G is reduced. The duration of this period = ont _ the effect of the temperature sensor 12 () In order to temporarily not measure the environmental degree, it is necessary to save the Wei's other effect. In order to avoid the brightness of the LED module (10) caused by the ambient temperature to rise and fall near the threshold value, the brightness of the LED module (10) is dimmed within a short period of time. The problem of flickering. 201039694 PT1536 30452twf.d〇c/n After the step coffee, the step back to green is repeated, and the ambient temperature Ta outside the lighting device 100 is detected again. The flow of Fig. 2 will be described below with reference to Fig. 3. Fig. 3 is a diagram showing the ratio of the driving current 1 of the embodiment of the present invention to the time __ map, and the vertical axis representing the ratio of the driving current 丨 to the slewing current of the illuminating two-pole UQ, and the horizontal axis represents time. At the point in time Τι to exceed the value m. Therefore, at time point ί is detected, step S240 will be performed to reduce the drive current ί, and the reduction ratio is the rated drive current after the war-down drive current ί is equal to the LED module u = stream _(10) %-2〇%). Then, in the rib time TeGnt of the time point τι to the time T2, the control circuit (10) uses the sensible drive 〇 〇 来 to illuminate the dioxin group (4), and stops detecting the ambient temperature during the holding interval = wide. At time T2, the control circuit Η0 performs step (4) to control the driver m to restore 100% of the rated drive current to drive the LED module η〇. The intention is. The duration Tbont is greater than or equal to 9 seconds, and the luminance is continuously changed to generate a wealth. Those skilled in the art; i understand that the manner of reducing the drive current is not limited to the above. For example, in another embodiment, the control circuit 14G can control the amplitude according to the difference between the ambient temperature Ta of the temperature sensor i= and the threshold value Tth. For example, each 汴 is an arithmetic progression, and the range of each number is reduced by 5% of the rated drive current. Change ^, when the temperature Ta is higher than the threshold value Tth by 5, the drive current j is reduced to 95% of the fixed drive current; when the ambient temperature Ta is higher than the threshold Tth, 201039694 riujo 30452twf.d〇c/ At n, the drive current I is reduced to 90% of the rated drive current. In addition, in the embodiment of the present invention, the driving current may be adjusted in such a manner that when the ambient temperature Ta exceeds the threshold m, the driving current is adjusted to the rated driving current X/', where 4〇^Χ<1〇 Hey. In another embodiment of the invention, the duration Tc〇nt can be extended to 20 seconds, 3 seconds, or 4 seconds. Since the driving current Ϊ of the illuminating diode module 110 is driven by the ambient temperature Ta of the Teont material at the time of (4), the brightness of the LED module 11 保持 in the duration Tcont is kept stable, thereby avoiding illuminating. The diode module 100 is flickering. 4 is a block diagram of a driver 13A and a light emitting diode module 110 of a lighting device according to another embodiment of the present invention. In this embodiment, the driver 130 is a DC-to-DC conversion circuit, and may be one of a commonly known buck, boost, or buck_b〇〇st driver. . The driver 13 of the present embodiment includes a digital-to-analog converter (DAC) 410, a pulse width modulation (PWM) circuit 420, switches SW1, ®, and a switch SW2. The pulse width modulation circuit 420 is connected to the switch SW1 and the switch SW2. The switch SW1 and the switch SW2 are coupled to the LED module u〇. The digital analog converter 410 receives the control/^ number Refl transmitted from the control circuit 140 to set the wave level of the pulse wave that the switch SW1 and the switch SW2 rotate. Therefore, the control signal Refl is used to adjust the current magnitude of the pulse wave outputted by the switch SWi and the switch SW2, thereby adjusting the driving current of the LED module 11A. In addition, the pulse width modulation circuit 420 receives the control signal Re Ω transmitted from the control circuit 14 以 to set the pulse wave of the output pulse 11 201039694 PT1536 iO^twf.doc/n of the pulse width modulation circuit 4 2 〇 width. Therefore, the control signal Ref2 is used to adjust the pulse width of the pulse wave outputted from the pulse width modulation circuit 420, so that the drive current of the light-emitting diode module 110 can be adjusted.

Referring to FIG. 5, FIG. 5 is a flow chart showing a method of controlling a lighting device according to another embodiment of the present invention. In the present embodiment, in step S53(), when the ambient temperature Ta is less than the threshold value Tth, the flow returns to step S520 to reactivate the temperature sensor 120. Otherwise, step S540 is performed for the light-emitting diode module 11() to emit light within the duration Tcont with the reduced drive current. After the duration Tcont of the step S540, the process returns to step S510 to drive the LED module 110 to emit light with the rated driving current. Next, in step S52, the control circuit 140 again activates the temperature sensor 12A to detect the current environmental degree Ta again. Next, in step S530, after the temperature sensor T is reactivated, when the ambient temperature Ta is greater than the threshold value Tth, the control circuit 14 turns off the temperature sensor 12A during the next duration Tcont, and controls the driver 130 to continue. The reduced driving current causes the light emitting diode module 11 to emit light. Figure 6 is a block diagram of a lighting device in accordance with another embodiment of the present invention. Referring to Figure 6, the illumination device 700 includes a temperature display 76A. The temperature display 760 is connected to the control circuit 140 for displaying the ambient temperature & the illumination device 700 further includes a memory ft 750. The memory is 75 〇 lightly connected to the control circuit to record the ambient temperature value. Temperature display 76. It is used to display the memory 75 〇 s recorded; the German 1 degree value and the temperature sense II 12Q 彳贞; _ the ambient temperature Ta. When t 'when the ambient temperature Ta detected by the temperature sensor 12G is greater than the ambient temperature value recorded by the body 750, the control (four) road threat is brought to the ambient temperature Ta of 12 201039694 riizoo j〇452twf.doc/n Update the ambient temperature value recorded by the memory 75〇. The way to record and rotate the ambient temperature value at any time is convenient for the equipment maintenance personnel to monitor the temperature of the lighting device. For example, if the lighting device is damaged by frequent waves, the memory and the ambient temperature = the value of the ambient temperature can be used to determine the degree of abnormal temperature and possible causes. In one embodiment, the device 7GG displays the ambient temperature at the temperature display 76G and transmits the temperature data to a remote control center for recording or display. 〇 β The illumination device of the above embodiment is applied to replace the conventional high-voltage neon silver lamp on the street to save more power. In addition, the down-regulation process in the embodiment avoids the conventional technique of making a continuous drive current reduction in a short time, so that the luminance of the illumination does not flicker. Moreover, the illumination device of the embodiment does not have a phenomenon in which the light source is suddenly turned off. Compared with the prior art, it avoids the inconvenience or danger of the user and helps to improve safety. As described above, the above embodiment of the present invention controls the hairiness of the hair-emitting diode group by detecting the ambient temperature outside the lighting device to adjust the driving current supplied from the driver. Therefore, it is possible to set a 〇 mechanism for over-temperature protection, and also provide a stable light source to illuminate the application site, thereby avoiding the danger caused by flickering or sudden changes in the light source. The present invention has been disclosed in the above embodiments, but it is not intended to limit the invention to those of ordinary skill in the art, and the present invention may be made without departing from the spirit and scope of the invention. The scope of protection shall be subject to the definition of the patent pending axis attached. In addition, any of the objects or advantages or features disclosed in the present invention are not required to be construed as the invention. In addition, the Abstract Section and the 13 201039694 π idjo JU4^2twf.doc/n headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a lighting device in accordance with an embodiment of the present invention. 2 is a flow chart of a control method of the embodiment of FIG. 1. 3 is a diagram showing the relationship between the driving current and the time of the embodiment of FIG. 2. 4 is a block diagram of a lighting device in accordance with another embodiment of the present invention. Fig. 5 is a flow chart showing a control method of a lighting device according to another embodiment of the present invention. 6 is a block diagram of a lighting device in accordance with another embodiment of the present invention. [Description of main component symbols] 100, 700: Illumination device 110: Light-emitting diode module 120. Temperature sensing 130: Driver 140: Control circuit 410: Digital analog converter 420: Pulse width modulation circuit 750: Memory 760: Temperature display GND: Ground I: Drive current 14 30452twf.doc/n 201039694

A A 1 V

Ref 1, Ref2: control signal S210~S240, S510~S540: steps of control method SW1, SW2: switch Ή, T2: point between B temples

Ta : ambient temperature

Tcont : duration

Tth: threshold VCC: voltage

15

Claims (1)

201039694 η i:o〇ju^tj2twf.doc/n VII. Patent application scope: The control method of L lighting device, the lighting device, the light-emitting diode module, the control = "degree; = The temperature sensor is configured to compare the ambient temperature with a threshold value by detecting an ambient temperature outside the lighting skirt, wherein when the threshold value is reached, the hair is lowered during a duration; δχ has weep, The driving current of the driving light of the 4th pole element module is used to cause the light emitting diode module to emit and turn off the temperature sensor for the duration of the time. ^Application for the special The shooting flow is equal to or less than the rated drive of the LED module. 3. The control method described in item i of the patent application includes the difference between the ambient temperature of the flow and the threshold. The driving power is as follows: The control method described in the scope of claim i, the continuation time is greater than 9 seconds. The holding method is as described in the scope of the patent application. The ambient temperature is displayed. 6. The control method described in the application of the May patent scope project records the ambient temperature in a memory. In the body; 匕 .. It is indicated that the ambient temperature recorded by the memory is at - temperature I page thousand. The green temperature of the environment is greater than the degree of interest. 16 30452twf.doc/n 201039694 Temperature to update the ambient temperature recorded by this memory. 7. The control method of claim 1, further comprising: re-enabling the temperature sensor after the duration has elapsed. 8. The control method according to claim 7, further comprising: after the re-enabling the temperature sensor, when the ambient temperature is less than the threshold, driving the light-emitting diode module to emit the light The rated drive current of the diode module is used for illumination. 9. The control method of claim 2, further comprising: driving the LED module to perform a rated driving current of the LED module when the ambient temperature is less than the threshold Glowing. 10. The controller as recited in claim 3, wherein the driving current is a pulse width modulation signal, and the control circuit pulses the driving current in a two-cycle manner. [Tail-working U. 'A lighting device comprising: a light-emitting diode module comprising at least one light-emitting diode; a temperature sensor for coupling the light-emitting diode to a light-driver external to the device a body module; driving the light emitting diode module to emit light; and adapting to the movable body, θ „. The control circuit is lightly connected to the temperature sensor and the driver for comparing The ambient temperature and the threshold value, = the detected ambient temperature is greater than the threshold value, and the detection current is stopped in the environment of the ?? The 201039694 ^^2twf.d〇c/n 12 of the external position of the service is equal to or less than 80% of the current of the device. The first-pole module The rated drive 13. As shown in the patent application scope, the driving current is - pulse width, and the residual shot is used to reduce the drive current. M] circuit to adjust the pulse width of the work system = °, 1 please refer to the equipment mentioned in Item 11 of the special fiber, which should be measured according to the temperature sensor The difference between the ambient temperature and the valve 曰1 determines the amplitude of the reduction of the drive current. 15. If you apply for the registration of the day, the time of the temple is greater than or equal to 9 seconds. ', the person 16 · ^ apply for the scope of the patent scope of the lighting device, including: production. / Li Duxian, coupled to the control circuit to display the ambient temperature 17 · as claimed in the scope of the 11th The lighting device of the present invention further includes: a memory device coupled to the control circuit for recording the ambient temperature; and ▲ a temperature display coupled to the control circuit for displaying the recorded by the memory The ambient temperature; wherein, when the ambient temperature detected by the temperature sensor is greater than the ambient temperature of the memory household, the control circuit is adapted to update the memory with the detected ambient temperature The illuminating device of the invention of claim 11, wherein the control circuit is adapted to re-energize the temperature sensor after the duration of time. 18 ___ 3U452twf.doc/ n 201039694 19. If applying for a patent The illuminating device of claim 18, wherein, after the temperature sensor is reactivated, when the ambient temperature is less than the threshold, the control circuit is adapted to control the driver to be driven by the LED module The illuminating device of claim 11, wherein the control circuit is adapted to control the driver to emit the light when the ambient temperature is less than the threshold The rated driving current of the polar body module causes the light emitting diode module to emit light. 19