Lighting device with 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 with 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 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 start or may have an overcurrent, and further, it may cause a malfunction of the lighting device.

[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 with an adaptive load voltage control function. [Means for solving the problem]

[0006] The present invention provides a lighting device with adaptive output power control functionality, comprising a dimming module, a control module, a rectifier module, and a light-emitting module. The control module stores a lookup table and is connected to the dimming module. The rectifier module is connected to the dimming module and the control module and generates a rectified voltage to drive 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 drive 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 dimming signal to control the dimming module, generates a target drive signal to drive the light-emitting module.

[0007] As an improvement to 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 to a reference voltage according to a preset conversion ratio.

[0008] As an improvement to 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 a control module.

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

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

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

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

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

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

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

[0016] Based on the above, a lighting device equipped with an adaptive load voltage control function according to the disclosure of the present invention may 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 rectifier module, and a light-emitting module. The control module stores a lookup table and is connected to the dimming module. The rectifier module is connected to the dimming module and the control module and generates a rectified voltage to drive 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 drive 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 dimming signal, controls the dimming module, generates a target drive signal, drives the light-emitting module, and thereby keeps the output power of the light-emitting module constant. Due to the adaptive output power control function described above, the control module quickly and accurately estimates the current operating voltage (load voltage) of the light-emitting module, converts it to a target dimming signal through the lookup table, and appropriately adjusts 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 lighting devices can be significantly improved, meeting the needs of practical applications. (2) According to the disclosure of the present invention, the lighting device is equipped with an adaptive load voltage control function and can maintain a constant output power of the dimming module. Therefore, when the voltage of the light-emitting module (load) of the lighting device changes significantly, the above-mentioned adaptive output power control function maintains a constant output power of the light-emitting module, 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 needs of actual applications 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 divider 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 to 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, and the voltage divider detection unit receives the reference voltage and converts the reference voltage to a feedback signal according to a preset voltage divider ratio. In this way, the control module can quickly compare the feedback signal with a lookup table to accurately estimate the output voltage of the dimming module and generate the estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the lookup table, adjust the output signal of the dimming module, and cause the dimming module to generate a target drive signal. The special load voltage detection mechanism described above can be applied to different loads, can quickly and efficiently detect the load voltage, and can change the output current of the dimming module according to the estimated output voltage. Thus, 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. The above control mechanism can effectively prevent damage to the light-emitting module due to sudden voltage changes, thereby preventing damage to the light-emitting module. Therefore, the service life of the lighting device can be effectively extended and environmental protection requirements can be met. (5) According to the disclosure of the present invention, the lighting device is equipped with an adaptive output power control function and can maintain a constant output power of the dimming module. Therefore, even if the electrical characteristics of the light-emitting module do not conform to predetermined specifications due to manufacturing errors, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module in conformity with 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] It is a block diagram of the circuit of a lighting device with an adaptive output power control function according to the first embodiment of the present invention. [Figure 2] It is the first explanatory diagram of the operating state of a lighting device with an adaptive output power control function according to the first embodiment of the present invention. [Figure 3] It is the second explanatory diagram of the operating state of a lighting device with an adaptive output power control function according to the first embodiment of the present invention. [Figure 4] It is a circuit diagram of the dimming module and the load voltage detection module of a lighting device with an adaptive output power control function according to the second embodiment of the present invention. [Figure 5] It is a circuit diagram of the control module of a lighting device with an adaptive output power control function according to the second embodiment of the present invention. [Figure 6] It is a voltage / current curve diagram of a lighting device with an adaptive output power control function according to the second embodiment of the present invention.

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 enable them to implement it 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] The following describes embodiments of the lighting device with adaptive output power control function of the present invention, with reference to the relevant drawings. For clarity and ease of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is described as “connected” or “joined” to another component, it may be a direct connection or coupling to that other component, or there may be an intermediary component. When a component is described as “directly connected” or “directly coupled” to another component, there is no intermediary component, and other terms used to describe relationships between components or layers should be interpreted similarly. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals.

[0020] Figure 1 is a block diagram of the circuit of a lighting device with adaptive output power control function according to a first embodiment of the present invention. As shown in the figure, the lighting device 1 includes a filter module 11, a rectifier 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 and receives the input voltage Vp of the external power supply to generate 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. The circuit configuration of the filter module 11 is well known to those skilled in the art and will not be described in detail here.

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

[0023] The power factor correction module 13 is connected to the rectifier module 12 and receives the rectified voltage to generate a correction voltage. In one embodiment, the power factor correction module 13 may be an active power factor correction (Active PFC) circuit. In another embodiment, the power factor correction module 13 may be a passive power factor correction (Passive PFC) circuit, a dynamic power factor correction (Dynamic PFC) circuit, or other similar component. The circuit structure of the power factor correction module 13 is well known to those skilled in the art and 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 a power factor correction module 13, which enables 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 light-emitting diode dimming circuits. The circuit structure of the dimming module 14 is well known to those skilled in the art and will not be described in detail here. The difference from conventional dimming circuits 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 divider circuit including multiple 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 divider detection unit 171 and stores a lookup table. The control module 17 is connected to the rectifier module 12 via a power supply module 16. The power supply module 16 receives the rectified voltage, generates a drive 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 component. 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 component.

[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. Subsequently, the dimming module 14 outputs an initial drive signal to drive the light-emitting module 15 and detects the current operating voltage of the light-emitting module 15. Next, the control module 17 compares the current operating voltage with a lookup table, generates a corresponding target dimming signal, controls the dimming module 14 to generate a target drive signal, and drives the light-emitting module 15. Through the above circuit structure, the control module 17 can perform a special adaptive output power control function.

[0029] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device with adaptive output power control function of this embodiment should still be within the scope of protection of the present invention.

[0030] Figures 2 and 3 are the first and second explanatory diagrams of the operating state of a lighting device equipped with an 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 a minimum initial dimming signal Cs and control the dimming module 14 to enter the operating state. Next, the dimming module 14 can output an 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] Subsequently, the output voltage extraction unit 141 of the dimming module 14 converts the output voltage of the dimming module 14 to a 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 divider detection unit 171 of the control module 17 receives the reference voltage Vr.

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

[0034] Subsequently, 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 quickly and accurately estimates the current operating voltage (load voltage) of the light-emitting module 15, converts it to the target dimming signal Gs through a lookup table, and appropriately adjusts the dimming signal of the dimming module 14. In this way, the output power of the light-emitting module 15 can be kept constant.

[0035] Furthermore, the control module 17 can generate the target dimming signal Gs by smoothly adjusting the duty cycle. The control mechanism described above effectively prevents damage to the light-emitting module 15 due to sudden voltage changes, thereby preventing damage to the light-emitting module 15. Therefore, the service life of the lighting device 1 can be effectively extended, and environmental protection requirements can be met.

[0036] Furthermore, the control module 17 can periodically generate a target dimming signal Gs to control the dimming module 14 to generate a 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 is always kept constant.

[0037] The above lookup table can list the above-mentioned preset conversion ratio and preset voltage division ratio, causing the control module 17 to calculate the estimated voltage Ve according to the above-mentioned preset conversion ratio and preset voltage division ratio, and the estimated voltage Ve can be made to approximate the actual output voltage of the dimming module 14. The above lookup table can also list 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. Subsequently, the control module 17 can control the dimming module 14 through the above-mentioned 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 matched to the output voltage, and the output power of the light-emitting module 15 can be kept constant.

[0038] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device with adaptive output power control function of this embodiment should still be within the scope of protection of the present invention.

[0039] Furthermore, 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, potentially causing an overload and leading to a malfunction of the lighting device. In addition, due to manufacturing tolerances, even light-emitting diodes of the same model number may have different power outputs, which can 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 significantly, the light-emitting diode may become unable to start or overcurrent may occur, potentially leading to a malfunction 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 rectifier module, and a light-emitting module. The control module stores a lookup table and is connected to the dimming module. The rectifier module is connected to the dimming module and the control module and generates a rectified voltage to drive 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 drive signal to drive the light-emitting module, detects the current operating voltage of the light-emitting module, compares the current operating voltage with a lookup table, generates a target dimming signal, controls the dimming module, generates a target drive signal, drives the light-emitting module, and thereby keeps the output power of the light-emitting module constant. Through the aforementioned adaptive output power control function, the control module quickly and accurately estimates the current operating voltage (load voltage) of the light-emitting module, converts it to a target dimming signal via the lookup table, and appropriately adjusts the dimming signal of the dimming module. In this way, the output power of the light-emitting module can be kept constant, preventing overload or failure of the lighting device. Therefore, the reliability of the lighting device can be significantly improved, meeting the needs of actual applications.

[0040] According to the first embodiment of the present invention, the lighting device is equipped with an adaptive load voltage control function that can maintain a constant output power of the dimming module. Therefore, when the voltage of the light-emitting module (load) of the lighting device changes significantly, the above-mentioned adaptive output power control function maintains a constant output power of the light-emitting module, ensuring that the light-emitting module can start up and effectively preventing the occurrence of overcurrent. Thus, the reliability of the lighting device can be further improved and the needs of actual applications can be met.

[0041] Furthermore, according to the first embodiment of the present invention, the lighting device includes a load voltage detection module. The control module includes a voltage divider 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 to 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, and the voltage divider detection unit receives the reference voltage and converts the reference voltage to a feedback signal according to a preset voltage divider ratio. In this way, the control module can quickly compare the feedback signal with a lookup table, accurately estimate the output voltage of the dimming module, and generate the estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the lookup table, adjust the output signal of the dimming module, and cause the dimming module to generate a target drive signal. The special load voltage detection mechanism described above 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 estimated output voltage. Thus, the output power of the light-emitting module can be kept constant.

[0042] Furthermore, according to the first embodiment of the present invention, the control module can generate a target dimming signal by smoothly adjusting the duty cycle. The above control mechanism can effectively prevent damage to the light-emitting module due to sudden voltage changes, thereby preventing damage to the light-emitting module. Therefore, the service life of the lighting device can be effectively extended, and environmental protection requirements can be met.

[0043] Furthermore, according to the first embodiment of the present invention, the lighting device is equipped with an adaptive output power control function, which can maintain a constant output power of the dimming module. Therefore, even if the electrical characteristics of the light-emitting module do not conform to predetermined specifications due to manufacturing errors, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module in conformity with predetermined specifications. Thus, 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 costs. Therefore, the practicality of the lighting device can be effectively improved and the needs of different applications can be met. The lighting device with adaptive output power control function based on the above embodiment of the present invention can certainly achieve excellent technical effects.

[0045] Figure 4 is a circuit diagram of a dimming module and a load voltage detection module of a lighting device with adaptive output power control function according to a second embodiment of the present invention. Refer to Figures 1 to 3 along with Figure 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 resistors R1 and R2, capacitors C1 and 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. The ends of capacitor C1 are connected to the first terminal LED1 and the second terminal LED2, respectively. Resistors R1 and R2 are connected in series to form a series circuit, and this series circuit and 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 ground GND and also to the second terminal LED2 via capacitor C2. The output voltage extraction unit 141 converts the output voltage of the dimming module 14 to a reference voltage Vr according to the 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, all connected in series with each other. The load voltage detection module 18 may receive a 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] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device with adaptive output power control function of this embodiment should still be within the scope of protection of the present invention.

[0050] Figure 5 is a circuit diagram of a control module for a lighting device with adaptive output power control function according to a second embodiment of the present invention. Refer to Figures 1 to 3 as well as Figure 5. 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 divider 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, which 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 ground GND. The fourth pin P4 is connected to the voltage divider detection unit 171. The voltage divider detection unit 171 includes a first voltage divider resistor Ru, a second voltage divider resistor Rd, a capacitor Ck, and a reference voltage receiving terminal RP. The ends of the first voltage divider resistor Ru are connected to the reference voltage receiving terminal RP and the first node N1, respectively. The ends of the second voltage divider resistor Rd are connected to the first node N1 and ground GND, respectively. The capacitor Ck is connected in parallel with the second voltage divider resistor Rd.

[0052] As described above, the voltage divider detection unit 171 converts the reference voltage Vr into a feedback signal Fs according to the preset voltage divider ratio of the voltage divider circuit consisting of the first voltage divider resistor Ru and the second voltage divider resistor Rd. The control chip CH compares the feedback signal Fs with a lookup table to estimate the output voltage of the dimming module 14 and generates an estimated voltage Ve, and generates a target dimming signal Gs based on the estimated voltage Ve. The control chip CH can then output the target dimming signal Gs via the dimming signal output terminal TP.

[0053] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device with adaptive output power control function of this embodiment should still be within the scope of protection of the present invention.

[0054] Figure 6 is a voltage / current curve diagram of a lighting device with adaptive output power control function according to a second embodiment of the present invention, and Figures 1 to 3 are also referenced. As shown in the figure, curve L1 represents the output voltage and curve L2 represents the output current. The lookup table can list the output currents corresponding to different output voltages of the dimming module 14 and the duty cycle of the control signal corresponding to different output currents. Thus, the control module 17 can compare the feedback signal Fs with the lookup table to estimate the output voltage of the dimming module 14 and generate an estimated voltage Ve, and generate a target dimming signal Gs according to the estimated voltage Ve. Subsequently, 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 mechanism described above, 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 via a lookup 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.

[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 divider 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 to 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, and the voltage divider detection unit 171 receives the reference voltage Vr and converts the reference voltage Vr to a feedback signal Fs according to a preset voltage divider ratio. In this way, the control module 17 can quickly compare the feedback signal Fs with a lookup table to accurately estimate the output voltage of the dimming module 14 and generate the estimated voltage Ve. Finally, the control module 17 can directly find the target dimming signal Gs corresponding to the estimated voltage Ve according to the lookup table, adjust the output signal of the dimming module 14, and cause the dimming module 14 to generate a target drive signal As. The special load voltage detection mechanism described above 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 estimated output voltage. Therefore, the output power of the light-emitting module 15 can be kept constant.

[0056] Through the adaptive output power control function described above, the control module 17 can quickly and accurately estimate the current operating voltage (load voltage) of the light-emitting module 15, convert it to a target dimming signal Gs via a lookup 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, preventing overload and failure of the lighting device 1. Furthermore, the adaptive output power control function described above can maintain a constant output power of the light-emitting module 15, ensuring that the light-emitting module 15 can start up and effectively preventing overcurrent conditions. Therefore, the reliability of the lighting device 1 can be greatly improved and the needs of actual applications can be met.

[0057] Furthermore, the lighting device 1 is equipped with an adaptive output power control function, which allows the output power of the dimming module 14 to be kept constant. Therefore, even if the electrical characteristics of the light-emitting module 15 do not conform to the predetermined specifications due to manufacturing tolerances, the adaptive output power control function allows the output power of the light-emitting module 15 to be maintained in conformity with the predetermined specifications. Thus, the performance of the lighting device 1 can be effectively optimized.

[0058] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device with adaptive output power control function of this embodiment should still be within the scope of protection 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 rectifier module, and a light-emitting module. The control module stores a lookup table and is connected to the dimming module. The rectifier module is connected to the dimming module and the control module and generates a rectified voltage to drive 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 drive 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 dimming signal, controls the dimming module, generates a target drive signal, drives the light-emitting module, and thereby keeps the output power of the light-emitting module constant. Due to the adaptive output power control function described above, the control module quickly and accurately estimates the current operating voltage (load voltage) of the light-emitting module, converts it to a target dimming signal through the lookup table, and appropriately adjusts 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 lighting devices can be significantly improved, meeting the needs of practical applications.

[0060] According to the first and second embodiments of the present invention, the lighting device is equipped with an adaptive load voltage control function, which can maintain a constant output power of the dimming module. Therefore, when the voltage of the light-emitting module (load) of the lighting device changes significantly, the adaptive output power control function maintains a constant output power of the light-emitting module, ensuring that the light-emitting module can start up and effectively preventing the occurrence of overcurrent. Thus, the reliability of the lighting device can be further improved and the needs of actual applications can be met.

[0061] Furthermore, 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 divider 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 to 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, and the voltage divider detection unit receives the reference voltage and converts the reference voltage to a feedback signal according to a preset voltage divider ratio. In this way, the control module can quickly compare the feedback signal with a lookup table to accurately estimate the output voltage of the dimming module and generate the estimated voltage. Finally, the control module can directly find the target dimming signal corresponding to the estimated voltage according to the lookup table, adjust the output signal of the dimming module, and cause the dimming module to generate a target drive signal. The special load voltage detection mechanism described above 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 estimated output voltage. Thus, the output power of the light-emitting module can be kept constant.

[0062] Furthermore, 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. The above control mechanism can effectively prevent damage to the light-emitting module due to sudden voltage changes, thereby preventing damage to the light-emitting module. Therefore, the service life of the lighting device can be effectively extended, and environmental protection requirements can be met.

[0063] Furthermore, according to the first and second embodiments of the present invention, the lighting device is equipped with an adaptive output power control function, which can maintain a constant output power of the dimming module. Therefore, even if the electrical characteristics of the light-emitting module do not conform to predetermined specifications due to manufacturing errors, the above-mentioned adaptive output power control function can maintain the output power of the light-emitting module in conformity with predetermined specifications. Thus, 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 costs. Therefore, the practicality of the lighting device can be effectively improved, and the needs of different applications can be met.

[0065] While the embodiments described herein are explained, it should be noted that this does not limit the scope of the claims of the present invention. Therefore, any changes and modifications to the embodiments described herein, or substitution of equivalent structures or processes using the contents of the specification and drawings of the present invention, or direct or indirect application of the above-described technology to other related technical fields, based on the innovative concept of the present invention, are all included within the scope of the claims of the present invention. [Explanation of symbols]

[0066] 1. Lighting device 11 Filter Modules 12 Rectifier Modules 13. Power Factor Correction Module 14 Dimming Module 141 Voltage Extraction Unit 15 Light-emitting modules 16 Power supply module 17 Control Module 171 Voltage detection unit 18. Load Voltage Detection Module MC Main Control Circuit R1 Resistor R2 resistance R3 resistance C1 Capacitor C2 Capacitor Ck Capacitor D1 diode LED1 Terminal 1 LED2, 2nd terminal CH control chip SP Operating Voltage Input Terminal TP Dimming Signal Output Terminal RP Reference Voltage Receiving Terminal EP Reference Voltage Output Terminal P1 1st pin P2 2nd pin P3 3rd pin P4 4th pin Ru: First voltage divider resistor Rd is the second voltage divider 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. Dimming module and A control module that saves a lookup table and is connected to the dimming module, A rectifier module connected to the dimming module and the control module, which generates a rectified voltage for driving the dimming module and the control module, The dimming module and the light-emitting module connected to the control module, Includes, 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 the current operating voltage of the light-emitting module, compares the current operating voltage with the lookup table, generates a corresponding target dimming signal, controls the dimming module to generate a target drive signal, and drives the light-emitting module. The dimming module includes an output voltage extraction unit, which converts the output voltage of the dimming module to a reference voltage according to a preset conversion ratio. The system further includes a load voltage detection module, the load voltage detection module receiving the reference voltage and transmitting it to the control module, The lighting device is equipped with an adaptive output power control function, characterized in that the control module includes a voltage divider detection unit, the voltage divider detection unit receives the reference voltage and converts the reference voltage into a feedback signal according to a preset voltage divider ratio, the control module compares the feedback signal with the lookup table to estimate the output voltage of the dimming module, generates an estimated voltage, forms the target dimming signal according to the estimated voltage, and keeps the output power of the light-emitting module constant.

2. The lighting device equipped with an adaptive output power control function according to claim 1, characterized in that the lookup table lists the preset conversion ratio and the preset voltage division ratio.

3. The lighting device equipped with an adaptive output power control function according to claim 1, characterized in that the output voltage extraction unit is a transformer.

4. The lighting device equipped with an adaptive output power control function according to claim 1, characterized in that the control module periodically generates the target dimming signal, controls the dimming module to generate a target drive signal, and drives the light-emitting module.

5. The lighting device with adaptive output power control function according to claim 1, further comprising an external power supply and a filter module connected to the rectifier module.

6. A lighting device with adaptive output power control function according to claim 1, further comprising a power factor correction module, wherein the rectifier module is connected to the dimming module via the power factor correction module.

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

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