Illumination device including adaptive load voltage control function

Abstract

To provide an illumination device including an adaptive load voltage control function.SOLUTION: An illumination device includes a light control module, a control module, a rectifying module, and a light emitting module. The control module stores a lookup table and is connected to the light control module. The rectifying module is connected to the light control module and the control module, and generates rectification voltage for driving the light control module and the control module. The light emitting module is connected to the light control module and the control module. The control module outputs an initial light control signal to control the light control module, outputs an initial driving signal to drive the light emitting module, detects the current operating voltage of the light emitting module, compares the current operating voltage with the lookup table, generates a target light control signal, controls the light control module, generates a target driving signal, and drives the light emitting module.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting device, particularly a lighting device having an adaptive load voltage control function.

Background Art

[0002] The power supplies of conventional light-emitting diode lighting devices mainly include a constant voltage source and a constant current source. However, the above two conventional power supply mechanisms may cause a series of problems in applications. When the power supply of the lighting device is a constant current source and the voltage of the light-emitting diode (load) of the lighting device changes, the output power of the lighting device may also change, resulting in an overload and the possibility of the lighting device malfunctioning. Also, due to manufacturing process errors, light-emitting diodes of the same model number may have different powers, which may also cause the above problems. When the power supply of the lighting device is a constant voltage power supply and the voltage of the light-emitting diode (load) of the lighting device fluctuates greatly, the light-emitting diode may fail to start or become overcurrent, and furthermore, it may cause the lighting device to malfunction.

[0003] Chinese Patent Application Publication No. 103874296 and Chinese Utility Model No. 206077764 both disclose the circuit design of lighting devices, but still cannot effectively solve the problems of the prior art.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a lighting device having an adaptive load voltage control function.

Means for Solving the Problem

[0006] The present invention provides a lighting device with an adaptive output power control function, including a dimming module, a control module, a rectification module, and a light-emitting module. The control module stores a look-up table and is connected to the dimming module. The rectification module is connected to the dimming module and the control module, and generates a rectified voltage for driving the dimming module and the control module. The light-emitting module is connected to the dimming module and the control module. The control module outputs an initial dimming signal to control the dimming module, outputs an initial driving signal to drive the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with the look-up table, generates a target dimming signal, controls the dimming module, generates a target driving signal, and drives the light-emitting module.

[0007] As an improvement of the present invention, the dimming module includes an output voltage extraction unit. The output voltage extraction unit converts the output voltage of the dimming module into a reference voltage according to a preset conversion ratio.

[0008] As an improvement of the present invention, the lighting device further includes a load voltage detection module. The load voltage detection module receives a reference voltage and transmits it to the control module.

[0009] As an improvement of the present invention, the control module includes a voltage division detection unit. The voltage division detection unit receives a reference voltage and converts the reference voltage into a feedback signal according to a preset voltage division ratio. The control module compares the feedback signal with the look-up table, estimates the output voltage of the dimming module, generates an estimated voltage, generates a target dimming signal according to the estimated voltage, and makes the output power of the light-emitting module constant.

[0010] As an improvement of the present invention, the output voltage extraction unit is a transformer.

[0011] As an improvement of the present invention, the control module periodically generates a target dimming signal, controls the dimming module to generate a target driving signal, and drives the light-emitting module.

[0012] As an improvement of the present invention, the lighting device further includes a filter module. The filter module is connected to an external power supply and a rectification module.

[0013] As an improvement of the present invention, the lighting device further includes a power factor correction module. The rectification module is connected to the dimming module via the power factor correction module.

[0014] As an improvement of the present invention, the lighting device further includes a power supply module. The rectification module is connected to the control module via the power supply module.

[0015] As an improvement of the present invention, the initial dimming signal and the target dimming signal are pulse width modulation signals.

Advantages of the Invention

[0016] Based on the above, the lighting device with an adaptive load voltage control function according to the disclosure of the present invention can have one or more of the following advantages. (1) According to the disclosure of the present invention, the lighting device includes a dimming module, a control module, a rectification module, and a light-emitting module. The control module stores a look-up table and is connected to the dimming module. The rectification module is connected to the dimming module and the control module, and generates a rectified voltage for driving the dimming module and the control module. The light-emitting module is connected to the dimming module and the control module. The control module outputs an initial dimming signal to control the dimming module, outputs an initial driving signal for driving the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with the look-up table, generates a target dimming signal, controls the dimming module, generates a target driving signal, and drives the light-emitting module, thereby making the output power of the light-emitting module constant. With the above-mentioned adaptive output power control function, the control module can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module, convert it into a target dimming signal through the look-up table, and appropriately adjust the dimming signal of the dimming module. In this way, the output power of the light-emitting module can be kept constant, and the occurrence of overload or failure of the lighting device can be prevented. Therefore, the reliability of the lighting device can be greatly improved, and the actual application requirements can be met. (2) According to the disclosure of the present invention, the lighting device has an adaptive load voltage control function and can maintain the output power of the dimming module constant. Therefore, when the voltage change of the light-emitting module (load) of the lighting device is large, with the above-mentioned adaptive output power control function, the output power of the light-emitting module is maintained constant, ensuring that the light-emitting module can start up and effectively preventing the occurrence of overcurrent. Therefore, the reliability of the lighting device can be further improved, and the actual application requirements can be met. (3) According to the disclosure of the present invention, the lighting device includes a load voltage detection module. The control module includes a voltage division detection unit, and the dimming module includes an output voltage extraction unit. The output voltage extraction unit converts the output voltage of the dimming module into a reference voltage according to a preset conversion ratio. The load voltage detection module receives the reference voltage and transmits it to the control module. The voltage division detection unit receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage division ratio. In this way, the control module can quickly compare the feedback signal with the look-up table, accurately estimate the output voltage of the dimming module, and generate an estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the look-up table, adjust the output signal of the dimming module, and enable the dimming module to generate a target drive signal. The above-mentioned special load voltage detection mechanism can be applied to different loads, quickly and efficiently detect the load voltage, and change the output current of the dimming module according to the output estimated voltage. Therefore, the output power of the light-emitting module can be kept constant. (4) According to the disclosure of the present invention, the control module can generate a target dimming signal by smoothly adjusting the duty cycle. By the above control mechanism, damage to the light-emitting module caused by sudden voltage changes can be effectively prevented, and damage to the light-emitting module can be prevented. Therefore, the service life of the lighting device can be effectively extended, and the requirements of environmental protection can be met. (5) According to the disclosure of the present invention, the lighting device has an adaptive output power control function and can keep the output power of the dimming module constant. Therefore, even when the electrical characteristics of the light-emitting module do not conform to the predetermined specifications due to manufacturing errors, the above adaptive output power control function can be used to keep the output power of the light-emitting module conform to the predetermined specifications. Therefore, the performance of the lighting device can be effectively optimized. (6) According to the disclosure of the present invention, the circuit design of the lighting device is simple and can achieve the desired effect without significantly increasing the cost. Therefore, the practicality of the lighting device can be effectively improved, and the needs of different applications can be satisfied.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0018] In the following embodiments, the detailed features and advantages of the present invention will be described. The content is sufficient for those skilled in the art to understand the technical content of the present invention and to enable its implementation accordingly. Moreover, according to the disclosure content, claims and drawings of this specification, those skilled in the art can easily understand the objectives and advantages of the present invention.

[0019] Hereinafter, with reference to the accompanying drawings, embodiments of an illumination device having an adaptive output power control function according to the present invention will be described. However, in order to make it easy to understand and easy to explain with the drawings, each member in the drawings may be shown with exaggerated or reduced dimensions and ratios. In the following description and / or claims, when a member is described as being "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or there may be an intervening member. When a member is described as being "directly connected" or "directly coupled" to another member, there is no intervening member, and the same should be interpreted for other terms used to explain the relationship between members or layers. For ease of understanding, the same members in the following embodiments will be described with the same reference numerals.

[0020] FIG. 1 is a block diagram of a circuit of an illumination device having an adaptive output power control function according to a first embodiment of the present invention. As shown in the figure, the illumination device 1 includes a filter module 11, a rectification module 12, a power factor correction module 13, a dimming module 14, a light emitting module 15, a power supply module 16, a control module 17, a module 17, and a load voltage detection module 18.

[0021] The filter module 11 is connected to an external power supply, receives the input voltage Vp of the external power supply, and generates a filtered voltage. In one embodiment, the filter module 11 may include one or more of a filter circuit, an electromagnetic interference (EMI) prevention circuit, a thermistor, and a varistor. Since the circuit configuration of the filter module 11 is well known to those skilled in the art, it will not be described in detail here.

[0022] The rectification module 12 is connected to the filter module 11, receives the filtered voltage, and generates a rectified voltage. In one embodiment, the rectification module 12 may be a full-wave rectifier. In another embodiment, the rectification module 12 may be a half-wave rectifier or other similar member. Since the circuit structure of the rectification module 12 is well known to those skilled in the art, it will not be described in detail here.

[0023] The power factor correction module 13 is connected to the rectification module 12, receives the rectified voltage, and generates a corrected voltage. In one embodiment, the power factor correction module 13 may be an Active PFC circuit. In another embodiment, the power factor correction module 13 may be a Passive PFC circuit, a Dynamic PFC circuit, or other similar components. Since the circuit structure of the power factor correction module 13 is well-known to those skilled in the art, it will not be described in detail here.

[0024] The dimming module 14 includes an output voltage extraction unit 141. The dimming module 14 is connected to the power factor correction module 13, enabling the power factor correction module 13 to supply power to the dimming module 14. In one embodiment, the dimming module 14 may be a DC / DC dimming circuit or other conventional various light-emitting diode dimming circuits. Since the circuit structure of the dimming module 14 is well-known to those skilled in the art, it will not be described in detail here. The difference from the conventional dimming circuit is that the dimming module 14 includes an output voltage extraction unit 141. In one embodiment, the output voltage extraction unit 141 may be a transformer. In another embodiment, the output voltage extraction unit 141 may be a voltage division circuit including a plurality of resistors or other similar circuits.

[0025] The light-emitting module 15 is connected to the dimming module 14. In one embodiment, the light-emitting module 15 may be a light-emitting diode (LED). In another embodiment, the light-emitting module 15 may be a light-emitting diode array.

[0026] The control module 17 includes a voltage division detection unit 171 and stores a look-up table. The control module 17 is connected to the rectification module 12 via the power supply module 16. The power supply module 16 receives the rectified voltage, generates a driving voltage, and supplies power to the control module 17. In one embodiment, the control module 17 may be a microcontroller (MCU). In another embodiment, the control module 17 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components. In one embodiment, the power supply module 16 may be a Buck converter. In another embodiment, the power supply module 16 may be a Boost converter, a Buck / Boost converter, or other similar components.

[0027] The load voltage detection module 18 is installed between the light-emitting module 15 and the control module 17. The control module 17 is connected to the light-emitting module 15 via the load voltage detection module 18.

[0028] The control module 17 outputs an initial dimming signal to control the dimming module 14 to enter an operating state. Thereafter, the dimming module 14 outputs an initial driving signal to drive the light-emitting module 15 and detect the current operating voltage of the light-emitting module 15. Next, the control module 17 compares the current operating voltage with the look-up table, generates a corresponding target dimming signal, controls the dimming module 14 to generate a target driving signal, and drives the light-emitting module 15. Through the above circuit structure, the control module 17 can execute a special adaptive output power control function.

[0029] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the adaptive output power control function of this embodiment should still be included in the protection scope of the present invention.

[0030] Figures 2 and 3 are the first explanatory diagram and the second explanatory diagram of the operating state of the lighting device with the adaptive output power control function according to the first embodiment of the present invention. As shown in Figure 2, the control module 17 can output the minimum initial dimming signal Cs and control the dimming module 14 to enter the operating state. Next, the dimming module 14 can output the initial drive signal Js to drive the light-emitting module 15. The initial dimming signal Cs may be a pulse width modulation (PWM) signal.

[0031] Thereafter, the output voltage extraction unit 141 of the dimming module 14 converts the output voltage of the dimming module 14 to the reference voltage Vr according to the preset conversion ratio.

[0032] Next, the load voltage detection module 18 receives the reference voltage Vr and transmits it to the control module 17. The voltage division detection unit 171 of the control module 17 receives the reference voltage Vr.

[0033] As shown in Figure 3, the voltage division detection unit 171 converts the reference voltage Vr to the feedback signal Fs according to the preset voltage division ratio. The control module 17 compares the feedback signal Fs with the look-up table, estimates the output voltage of the dimming module 14 to generate the estimated voltage Ve, and generates the target dimming signal Gs according to the estimated voltage Ve. The target dimming signal Gs may be a pulse width modulation (PWM) signal.

[0034] Thereafter, the control module 17 transmits the target dimming signal Gs to the dimming module 14, controls the dimming module 14 to generate the target drive signal As, and drives the light-emitting module 15. Through the above mechanism, the control module 17 can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module 15, convert it to the target dimming signal Gs through the look-up table, and appropriately adjust the dimming signal of the dimming module 14. In this way, the output power of the light-emitting module 15 can be maintained constant.

[0035] In addition, the control module 17 can generate the target dimming signal Gs by smoothly adjusting the duty cycle. By means of the above control mechanism, damage to the light-emitting module 15 caused by sudden voltage changes can be effectively prevented, and damage to the light-emitting module 15 can be prevented. Therefore, the service life of the lighting device 1 can be effectively extended, and the requirements of environmental protection can be met.

[0036] In addition, the control module 17 can periodically generate the target dimming signal Gs, control the dimming module 14 to generate the target drive signal As, and drive the light-emitting module 15. The above control mechanism can effectively ensure that the output power of the light-emitting module 15 can always be maintained constant.

[0037] The above lookup table can record the above preset conversion ratio and preset voltage division ratio, cause the control module 17 to calculate the estimated voltage Ve according to the above preset conversion ratio and preset voltage division ratio, calculate the estimated voltage Ve, and the estimated voltage Ve can approach the actual output voltage of the dimming module 14. In addition, the above lookup table can also record control signals corresponding to different estimated voltages (these control signals control the dimming module 14 to generate output currents corresponding to different estimated voltages). Therefore, the control module 17 can compare the estimated voltage Ve with the lookup table, find the duty cycle of the control signal corresponding to the estimated voltage Ve, and generate the target dimming signal Gs. Then, the control module 17 can control the dimming module 14 through the above target dimming signal Gs, and the dimming module 14 can generate the corresponding target drive signal As. In this way, the output current of the dimming module 14 can be adapted to the output voltage, and the output power of the light-emitting module 15 can be maintained constant.

[0038] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device equipped with the adaptive output power control function of this embodiment should still be included in the protection scope of the present invention.

[0039] Note that when the power supply of the lighting device is a constant current source and the voltage of the light-emitting diode (load) of the lighting device changes, the output power of the lighting device may also change, resulting in an overload and the possibility of the lighting device malfunctioning. Also, due to errors in the manufacturing process, light-emitting diodes of the same model number may have different powers, which may also cause the above problems. When the power supply of the lighting device is a constant voltage power supply and the voltage of the light-emitting diode (load) of the lighting device fluctuates greatly, the light-emitting diode may not be able to start or may have an overcurrent, and further, it may cause a failure of the lighting device. In contrast, according to the first embodiment of the present invention, the lighting device includes a dimming module, a control module, a rectification module, and a light-emitting module. The control module stores a look-up table and is connected to the dimming module. The rectification module is connected to the dimming module and the control module and generates a rectified voltage for driving the dimming module and the control module. The light-emitting module is connected to the dimming module and the control module. The control module outputs an initial dimming signal to control the dimming module, outputs an initial driving signal to drive the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with the look-up table, generates a target dimming signal, controls the dimming module, generates a target driving signal, drives the light-emitting module, thereby making the output power of the light-emitting module constant. With the above-described adaptive output power control function, the control module can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module, convert it into a target dimming signal through the look-up table, and appropriately adjust the dimming signal of the dimming module. In this way, the output power of the light-emitting module can be kept constant, and the occurrence of overload or failure of the lighting device can be prevented. Therefore, the reliability of the lighting device can be greatly improved, and the actual application requirements can be met.

[0040] According to the first embodiment of the present invention, the lighting device is provided with an adaptive load voltage control function and can maintain the output power of the dimming module constant. Therefore, when the voltage change of the light-emitting module (load) of the lighting device is large, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module constant, ensure that the light-emitting module can be started, and effectively prevent the occurrence of overcurrent. Therefore, the reliability of the lighting device can be further improved, and the actual application requirements can be met.

[0041] Also, according to the first embodiment of the present invention, the lighting device includes a load voltage detection module. The control module includes a voltage division detection unit, and the dimming module includes an output voltage extraction unit. The output voltage extraction unit converts the output voltage of the dimming module into a reference voltage according to a preset conversion ratio. The load voltage detection module receives the reference voltage and transmits it to the control module. The voltage division detection unit receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage division ratio. In this way, the control module can quickly compare the feedback signal with the look-up table, accurately estimate the output voltage of the dimming module, and generate an estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the look-up table, adjust the output signal of the dimming module, and enable the dimming module to generate a target drive signal. The above-mentioned special load voltage detection mechanism can be applied to different loads, quickly and efficiently detect the load voltage, and change the output current of the dimming module according to the output estimated voltage. Therefore, the output power of the light-emitting module can be maintained constant.

[0042] Moreover, according to the first embodiment of the present invention, the control module can generate a target dimming signal by smoothly adjusting the duty cycle. By the above control mechanism, damage to the light-emitting module caused by a sudden voltage change can be effectively prevented, and damage to the light-emitting module can be prevented. Therefore, the service life of the lighting device can be effectively extended, and the requirements of environmental protection can be met.

[0043] Also, according to the first embodiment of the present invention, the lighting device has an adaptive output power control function and can maintain the output power of the dimming module constant. Therefore, even when the electrical characteristics of the light-emitting module do not conform to the predetermined specifications due to manufacturing errors, the above adaptive output power control function can maintain the output power of the light-emitting module to conform to the predetermined specifications. Therefore, the performance of the lighting device can be effectively optimized.

[0044] Furthermore, according to the first embodiment of the present invention, the circuit design of the lighting device is simple, and the desired effect can be obtained without significantly increasing the cost. Therefore, the practicality of the lighting device can be effectively improved, and the needs of different applications can be met. The lighting device with the adaptive output power control function based on the above embodiment of the present invention can surely achieve excellent technical effects.

[0045] FIG. 4 is a circuit diagram of the dimming module and the load voltage detection module of the lighting device with the adaptive output power control function according to the second embodiment of the present invention. Refer to FIGS. 1 to 3 together with FIG. 4. As shown in the figure, the dimming module 14 includes a main control circuit MC (including a control chip and other necessary electronic components) and output terminals. The output terminals include a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, a first terminal LED1, a second terminal LED2, and an output voltage extraction unit 141. The first terminal LED1 and the second terminal LED2 are connected to the light-emitting module 15.

[0046] The main control circuit MC is connected to the first terminal LED1 and the second terminal LED2. Both ends of the capacitor C1 are connected to the first terminal LED1 and the second terminal LED2 respectively. The resistors R1 and R2 are connected in series to form a series circuit, and this series circuit and the capacitor C1 are connected in parallel.

[0047] As described above, the primary side of the output voltage extraction unit 141 (a transformer in this embodiment) is connected to the second terminal LED2. The secondary side of the output voltage extraction unit 141 is connected to the ground GND and is also connected to the second terminal LED2 via the capacitor C2. The output voltage extraction unit 141 converts the output voltage of the dimming module 14 to the reference voltage Vr according to a preset conversion ratio (turns ratio).

[0048] The load voltage detection module 18 includes a resistor R3, a diode D1, and a reference voltage output terminal EP connected in series with each other. The load voltage detection module 18 may receive the reference voltage Vr from the secondary side of the output voltage extraction unit 141 and output the reference voltage Vr via the reference voltage output terminal EP.

[0049] Of course, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the adaptive output power control function of this embodiment should still be included in the protection scope of the present invention.

[0050] FIG. 5 is a circuit diagram of the control module of the lighting device with the adaptive output power control function according to the second embodiment of the present invention. Refer to FIG. 5 and at the same time refer to FIGS. 1 to 3. As shown in the figure, the control module 17 includes a control chip CH, an operating voltage input terminal SP, a dimming signal output terminal TP, and a voltage division detection unit 171.

[0051] The control chip CH includes a first pin P1, a second pin P2, a third pin P3, and a fourth pin P4. The first pin P1 is connected to the operating voltage input terminal SP, and the operating voltage input terminal SP is connected to the power supply module 16. The second pin P2 is connected to the dimming signal output terminal TP. The third pin P3 is connected to the ground GND. The fourth pin P4 is connected to the voltage division detection unit 171. The voltage division detection unit 171 includes a first voltage division resistor Ru, a second voltage division resistor Rd, a capacitor Ck, and a reference voltage receiving terminal RP. Both ends of the first voltage division resistor Ru are respectively connected to the reference voltage receiving terminal RP and the first node N1. Both ends of the second voltage division resistor Rd are respectively connected to the first node N1 and the ground GND. The capacitor Ck is connected in parallel with the second voltage division resistor Rd.

[0052] As described above, the voltage division detection unit 171 converts the reference voltage Vr into the feedback signal Fs according to the preset voltage division ratio of the voltage division circuit composed of the first voltage division resistor Ru and the second voltage division resistor Rd. The control chip CH compares the feedback signal Fs with the look-up table, estimates the output voltage of the dimming module 14 to generate the estimated voltage Ve, and generates the target dimming signal Gs based on the estimated voltage Ve. Then, the control chip CH can output the target dimming signal Gs through the dimming signal output terminal TP.

[0053] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the adaptive output power control function of this embodiment should still be included in the protection scope of the present invention.

[0054] FIG. 6 is a voltage / current curve diagram of a lighting device equipped with the adaptive output power control function according to the second embodiment of the present invention. Referring to FIG. 6 and simultaneously referring to FIGS. 1 to 3. As shown in the figure, curve L1 represents the output voltage, and curve L2 represents the output current. The look-up table can describe the output current corresponding to different output voltages of the dimming module 14 and the duty ratio of the control signal corresponding to different output currents. Therefore, the control module 17 can compare the feedback signal Fs with the look-up table, estimate the output voltage of the dimming module 14 to generate an estimated voltage Ve, and generate a target dimming signal Gs according to the estimated voltage Ve. Thereafter, the control module 17 transmits the target dimming signal Gs to the dimming module 14, controls the dimming module 14 to generate a target drive signal As, and drives the light-emitting module 15. Through the above mechanism, the control module 17 can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module 15, convert it into a target dimming signal Gs through the look-up table, and appropriately adjust the dimming signal of the dimming module 14. In this way, the output power of the light-emitting module 15 can be maintained constant.

[0055] As can be seen from the above, the lighting device 1 includes a load voltage detection module 18. The control module 17 includes a voltage division detection unit 171, and the dimming module 14 includes an output voltage extraction unit 141. The output voltage extraction unit 141 converts the output voltage of the dimming module 14 into a reference voltage Vr according to a preset conversion ratio. The load voltage detection module 18 receives the reference voltage Vr and transmits it to the control module 17. The voltage division detection unit 171 receives the reference voltage Vr and converts the reference voltage Vr into a feedback signal Fs according to a preset voltage division ratio. In this way, the control module 17 can quickly compare the feedback signal Fs with a look-up table, accurately estimate the output voltage of the dimming module 14, and generate an estimated voltage Ve. Finally, the control module 17 can directly find a target dimming signal Gs corresponding to the estimated voltage Ve according to the look-up table, adjust the output signal of the dimming module 14, and cause the dimming module 14 to generate a target drive signal As. The above-mentioned special load voltage detection mechanism can be applied to different loads, quickly and efficiently detect the load voltage, and change the output current of the dimming module 14 according to the output estimated voltage. Therefore, the output power of the light-emitting module 15 can be kept constant.

[0056] Through the above-mentioned adaptive output power control function, the control module 17 can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module 15, convert it into a target dimming signal Gs through a look-up table, and appropriately adjust the dimming signal of the dimming module 14. In this way, the output power of the light-emitting module 15 can be kept constant, and the occurrence of overload and failure of the lighting device 1 can be prevented. In addition, the above-mentioned adaptive output power control function can keep the output power of the light-emitting module 15 constant, ensure that the light-emitting module 15 can be started, and effectively prevent the overcurrent state. Therefore, the reliability of the lighting device 1 can be greatly improved, and the actual application requirements can be met.

[0057] In addition, the lighting device 1 is provided with an adaptive output power control function and can maintain the output power of the dimming module 14 constant. Therefore, even when the electrical characteristics of the light-emitting module 15 do not conform to the predetermined specifications due to manufacturing errors, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module 15 so as to conform to the predetermined specifications. Therefore, the performance of the lighting device 1 can be effectively optimized.

[0058] Naturally, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the adaptive output power control function of this embodiment should still be included in the protection scope of the present invention.

[0059] In summary, according to the first and second embodiments of the present invention, the lighting device includes a dimming module, a control module, a rectification module, and a light-emitting module. The control module stores a look-up table and is connected to the dimming module. The rectification module is connected to the dimming module and the control module and generates a rectified voltage for driving the dimming module and the control module. The light-emitting module is connected to the dimming module and the control module. The control module outputs an initial dimming signal to control the dimming module, outputs an initial driving signal for driving the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with the look-up table, generates a target dimming signal, controls the dimming module, generates a target driving signal, drives the light-emitting module, thereby making the output power of the light-emitting module constant. With the above-mentioned adaptive output power control function, the control module can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module, convert it into a target dimming signal through the look-up table, and appropriately adjust the dimming signal of the dimming module. In this way, the output power of the light-emitting module can be kept constant, and the occurrence of overload or failure of the lighting device can be prevented. Therefore, the reliability of the lighting device is greatly improved, and the actual application requirements can be met.

[0060] According to the first and second embodiments of the present invention, the lighting device is provided with an adaptive load voltage control function and can maintain the output power of the dimming module constant. Therefore, when the voltage change of the light-emitting module (load) of the lighting device is large, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module constant, ensure that the light-emitting module can be started, and effectively prevent the occurrence of overcurrent. Therefore, the reliability of the lighting device can be further improved to meet the requirements of actual applications.

[0061] Also, according to the first and second embodiments of the present invention, the lighting device includes a load voltage detection module. The control module includes a voltage division detection unit, and the dimming module includes an output voltage extraction unit. The output voltage extraction unit converts the output voltage of the dimming module into a reference voltage according to a preset conversion ratio. The load voltage detection module receives the reference voltage and transmits it to the control module. The voltage division detection unit receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage division ratio. In this way, the control module can quickly compare the feedback signal with the look-up table, accurately estimate the output voltage of the dimming module, and generate an estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the look-up table, adjust the output signal of the dimming module, and enable the dimming module to generate a target drive signal. The above-mentioned special load voltage detection mechanism can be applied to different loads, quickly and efficiently detect the load voltage, and change the output current of the dimming module according to the output estimated voltage. Therefore, the output power of the light-emitting module can be maintained constant.

[0062] Also, according to the first and second embodiments of the present invention, the control module can generate a target dimming signal by smoothly adjusting the duty cycle. With the above control mechanism, damage to the light-emitting module caused by sudden voltage changes can be effectively prevented, and damage to the light-emitting module can be prevented. Therefore, the service life of the lighting device can be effectively extended, and the requirements of environmental protection can be met.

[0063] Also, according to the first and second embodiments of the present invention, the lighting device has an adaptive output power control function and can maintain the output power of the dimming module constant. Therefore, even when the electrical characteristics of the light-emitting module do not conform to the specified specifications due to manufacturing errors, the above adaptive output power control function can maintain the output power of the light-emitting module to conform to the specified specifications. Therefore, the performance of the lighting device can be effectively optimized.

[0064] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device is simple, and the desired effect can be obtained without significantly increasing the cost. Therefore, the practicality of the lighting device can be effectively improved, and the needs of different applications can be met.

[0065] It should be noted that although the above embodiments are described in this specification, they do not limit the scope of the claims of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described in this specification, or substitutions of equivalent structures or equivalent processes made using the content of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields, all fall within the scope of the claims of the present invention.

Description of Reference Numerals

[0066] 1 Lighting device 11 Filter module 12 Rectifier module 13 Power factor correction module 14 Dimming module 141 Voltage extraction unit 15 Light-emitting module 16 Power supply module 17 Control module 171 Voltage detection unit 18 Load voltage detection module MC Main control circuit R1 Resistor R2 Resistor R3 Resistor C1 Capacitor C2 Capacitor Ck Capacitor D1 Diode LED1 First terminal LED2 Second terminal CH Control chip SP Operating voltage input terminal TP Dimming signal output terminal RP Reference voltage reception terminal EP Reference voltage output terminal P1 First pin P2 Second pin P3 Third pin P4 Fourth pin Ru First voltage-dividing resistor Rd Second voltage-dividing resistor GND Ground N1 First node Cs Initial dimming signal Gs Target dimming signal Js Initial drive signal As Target drive signal Vr Reference voltage Fs Feedback signal Ve Estimated voltage L1 Curve L2 Curve

Claims

1. A dimming module; a control module storing a lookup table and coupled to the dimming module; a rectification module connected to the dimming module and the control module, for generating a rectification voltage for driving the dimming module and the control module; a light emitting module connected to the dimming module and the control module; Including, The control module outputs an initial dimming signal to control the dimming module, outputs an initial drive signal to drive the light-emitting module, detects a current operating voltage of the light-emitting module, compares the current operating voltage with the look-up table, generates a corresponding target dimming signal, and controls the dimming module to generate a target drive signal to drive the light-emitting module.

2. 2. The lighting device with adaptive output power control function of claim 1 , wherein the dimming module includes an output voltage extraction unit, and the output voltage extraction unit converts the output voltage of the dimming module to a reference voltage according to a preset conversion ratio.

3. 3. The lighting device with adaptive output power control function of claim 2, further comprising a load voltage detection module, the load voltage detection module receiving the reference voltage and transmitting it to the control module.

4. 4. The lighting device with adaptive output power control function of claim 3, wherein the control module includes a voltage division detection unit, which receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage division ratio, and the control module compares the feedback signal with the look-up table to estimate an output voltage of the dimming module, generates an estimated voltage, and forms the target dimming signal according to the estimated voltage to keep the output power of the light-emitting module constant.

5. 5. The lighting device with adaptive output power control function according to claim 4, wherein the look-up table describes the preset conversion ratio and the preset voltage division ratio.

6. 3. The lighting device with adaptive output power control function according to claim 2, wherein the output voltage extraction unit is a transformer.

7. 2. The lighting device with adaptive output power control function according to claim 1 , wherein the control module periodically generates the target dimming signal, controls the dimming module to generate a target driving signal, and drives the light-emitting module.

8. 2. The lighting device with adaptive output power control function as claimed in claim 1, further comprising a filter module connected to an external power source and the rectifier module.

9. 2. The lighting device with adaptive output power control function according to claim 1, further comprising a power factor correction module, wherein the rectification module is connected to the dimming module via the power factor correction module.

10. 2. The lighting device with adaptive output power control function according to claim 1, further comprising a power supply module, wherein the rectification module is connected to the control module via the power supply module.

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