Lighting device equipped with a multi-stage voltage boosting mechanism

Abstract

To provide a lighting device having a multi-stage boosting mechanism.SOLUTION: A lighting device having a multi-stage boosting mechanism includes a light-emitting module, a rectifier module, a first detection module, a boosting module, a step-down module, and a control module. The rectifier module receives an AC voltage and generates an input voltage. The first detection module generates a first feedback signal in response to the input voltage. The boosting module receives the input voltage and generates an output voltage. The step-down module receives the output voltage and generates a drive voltage for driving the light-emitting module. The control module controls the boosting module to execute a low-voltage output mode when it determines based on the first feedback signal that the input voltage is less than a preset threshold, and controls the boosting module to execute a boost output mode when it determines based on the first feedback signal that the input voltage is greater than the preset threshold.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting device, particularly a lighting device provided with a multi-stage boosting mechanism.

Background Art

[0002] Conventional wide-voltage and high-power-factor lighting devices usually use a single-pole power module (buck converter or boost / buck converter) or a two-stage power module (boost converter and buck converter). The single-pole power module is likely to have the output current fluctuating in a complex power grid environment, resulting in phenomena such as stroboscopic and light intensity fluctuations. Therefore, the single-pole power module usually needs to add a stroboscopic removal circuit to achieve the effect of no stroboscope, which greatly increases the cost and reduces the power conversion efficiency.

[0003] The two-stage power module can solve the above problems. However, the two-stage power module has low power conversion efficiency under low-voltage input conditions. Therefore, to compensate for the above reduction in power conversion efficiency, it is necessary to increase the number of light sources or use more expensive light sources, which also increases the cost of the lighting device.

[0004] Both the Chinese Patent Application Publication No. 1868107 and the Chinese Patent Application Publication No. 116367393 disclose improved circuit designs, but still cannot effectively solve the problems of the prior art.

Prior Art Documents

Patent Documents

[0005]

Patent Document No. 1

Patent Document No. 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The object of the present invention is to provide a lighting device equipped with a multi-stage voltage boosting mechanism. [Means for solving the problem]

[0007] The present invention provides a lighting device equipped with a multi-stage boost mechanism including a light-emitting module, a rectifier module, a first detection module, a boost module, a buck module, and a control module. The rectifier module receives an AC voltage and generates an input voltage. The first detection module generates a first feedback signal according to the input voltage. The boost module receives an input voltage and generates an output voltage. The buck module receives an output voltage and generates a drive voltage for driving the light-emitting module. The control module controls the boost module. If the control module determines, based on the first feedback signal, that the input voltage is below a preset threshold, it controls the boost module to execute a low-voltage output mode, and if the control module determines, based on the first feedback signal, that the input voltage is above a preset threshold, it controls the boost module to execute a boosted output mode.

[0008] Based on an improvement of the present invention, the low-voltage output mode is a constant-voltage output mode.

[0009] An improvement to the present invention further includes a second detection module. The second detection module generates a second feedback signal in accordance with the output voltage. The control module controls the boost module based on the first and second feedback signals to execute a boosted output mode.

[0010] Based on an improvement of the present invention, the control module integrates the first feedback signal and the second feedback signal to generate an integrated feedback signal, generates a boost control signal according to the integrated feedback signal, and controls the boost module to execute a boost output mode.

[0011] Based on an improvement of the present invention, the boost output mode is a voltage-following mode, in which the output voltage generated by the boost module increases in accordance with the input voltage.

[0012] Based on an improvement of the present invention, the boost output mode is a constant voltage output mode, in which the output voltage generated by the boost module is constant and greater than the input voltage.

[0013] Based on an improvement of the present invention, the control module is a comparator.

[0014] Based on an improvement of the present invention, the control module is a controller.

[0015] Based on an improvement of the present invention, the light source module is a light-emitting diode, a light-emitting diode array, or other similar component.

[0016] Based on an improvement of the present invention, the rectifier module includes a full-wave rectifier, a half-wave rectifier, or other similar component. [Effects of the Invention]

[0017] Based on the above, a lighting device equipped with a multi-stage boost mechanism disclosed in 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 light-emitting module, a rectifier module, a first detection module, a boost module, a buck module, and a control module. The rectifier module receives an AC voltage and generates an input voltage. The first detection module generates a first feedback signal based on the input voltage. The boost module receives an input voltage and generates an output voltage. The buck module receives an output voltage and generates a drive voltage for driving the light-emitting module. The control module controls the boost module. The control module controls the boost module to perform a low-voltage output mode when it is determined that the input voltage is below a preset threshold based on the first feedback signal, and controls the boost module to perform a boost when the input voltage is above the threshold. Preset threshold based on the first feedback signal. Due to the multi-stage boost mechanism described above, the boost module can perform a low-voltage output mode when the input voltage is low and a boost output mode when the input voltage is above the preset threshold to reduce the input. Voltage difference between the voltage of the boost module and the output voltage. Therefore, the power conversion efficiency of the lighting device can be greatly improved. (2) According to the disclosure of the present invention, the lighting device further includes a second detection module. The second detection module generates a second feedback signal based on the output voltage. The control module integrates the first feedback signal and the second feedback signal to generate an integrated feedback signal, and generates a boost control signal based on the integrated feedback signal to control the boost module to perform a boosted output mode. The above feedback signal integration mechanism enables the control module to accurately perform calculations based on the detection information provided by the first detection module and the second detection module, improving the response speed to voltage fluctuations. Therefore, the lighting device can not only effectively improve power conversion efficiency but also prevent stroboscopic phenomena and fluctuations in light intensity, significantly improving the performance of the lighting device to meet the needs of actual applications. (3) According to the disclosure of the present invention, the lighting device integrates a rectifier module, a boost module, and a buck module, and has the above-mentioned multi-stage boost mechanism and feedback signal integration mechanism. In this way, the lighting device can not only achieve high luminous efficiency, but also improve the power factor and reduce total harmonic distortion, further improving the performance of the lighting device and meeting the needs of actual applications. (4) According to the disclosure of the present invention, the circuit design of the lighting device can realize the multi-stage boost mechanism and the feedback signal integration mechanism described above, and the power conversion efficiency of the lighting device can be greatly improved. In this way, the lighting device can utilize energy more efficiently and improve the energy efficiency of the lighting device. Therefore, the lighting device can become more energy-efficient and conform to the requirements of environmental protection and future development trends. (5) According to the disclosure of the present invention, the first detection module, the second detection module, and the control module of the lighting device can be implemented with a simple circuit design, thereby realizing the multi-stage boost mechanism and the feedback signal integration mechanism described above. In this way, the lighting device can effectively achieve the desired effect without the need to add a strobe removal circuit or an expensive light source. Therefore, the cost of the lighting device can be significantly reduced, the applications of the lighting device can be broadened, and the requirements of different applications can be met. [Brief explanation of the drawing]

[0018] [Figure 1] This is a block diagram of the circuit structure of a lighting device equipped with a multi-stage boost mechanism according to the first embodiment of the present invention. [Figure 2] This is an explanatory diagram of the operating state of a lighting device equipped with a multi-stage boost mechanism according to the first embodiment of the present invention. [Figure 3] This is a circuit diagram of a lighting device equipped with a multi-stage boost mechanism according to a second embodiment of the present invention. [Figure 4] This is an input voltage / output voltage curve diagram of a boost module in a lighting device equipped with a multi-stage boost mechanism according to a second embodiment of the present invention. [Figure 5] This is a circuit diagram of a lighting device equipped with a multi-stage boost mechanism according to a third embodiment of the present invention.

Best Mode for Carrying Out the Invention

[0019] 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, based on the disclosure content of this specification, the scope of the claims, and the drawings, those skilled in the art can easily understand the objectives and advantages of the present invention.

[0020] Hereinafter, referring to the related drawings, embodiments of a lighting device provided with a multi-stage boosting mechanism of the present invention will be described. However, for the sake of easy understanding and easy explanation in the drawings, the components in the drawings may be shown with exaggerated or reduced dimensions and ratios. In the following description and / or the scope of the claims, when it is stated that a member "is connected" or "is coupled" to another member, it may be directly connected or coupled to the other member, or there may be an intervening member. When it is stated that a member "is directly connected" or "is 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 easy understanding, the same members in the following embodiments will be described with the same reference numerals.

[0021] FIG. 1 and FIG. 2 are a block diagram of the circuit structure and an explanatory diagram of the operating state of a lighting device provided with a multi-stage boosting mechanism according to the first embodiment of the present invention. As shown in the figures, the lighting device 1 includes an input module 11, a rectification module 12, a boosting module 13, a buck module 14, a light-emitting module 15, a first detection module 16, a second detection module 17, and a control module 18.

[0022] The input module 11 is connected to an external power source. The input module 11 receives an AC voltage from the external power source. In one embodiment, the external power source is a main power source. In another embodiment, the external power source is a generator or other power grid that can provide an AC input voltage.

[0023] The rectifier module 12 is connected to the input module 11. The rectifier module 12 receives an AC voltage Pin and generates an input voltage Vin. In one embodiment, the rectifier module 12 includes a full-wave rectifier. In another embodiment, the rectifier module 12 may include a half-wave rectifier.

[0024] The first detection module 16 is connected to the rectifier module 12. The first detection module 16 generates a first feedback signal Bs1 according to the input voltage Vin.

[0025] The boost module 13 is connected to the rectifier module 12 and the first detection module 16. The boost module 13 receives the input voltage Vin and generates the output voltage Vout.

[0026] The second detection module 17 is connected to the boost module 13. The second detection module 17 generates a second feedback signal Bs2 according to the output voltage Vout.

[0027] The buck module 14 is connected to the boost module 13 and the second detection module 17. The light-emitting module 15 is connected to the buck module 14. The buck module 14 receives the output voltage Vout and generates a drive voltage Vd to drive the light-emitting module 15. In one embodiment, the light-emitting module 15 is a light-emitting diode. In another embodiment, the light-emitting module 15 may be a light-emitting diode array or other similar component.

[0028] The control module 18 is connected to the first detection module 16, the second detection module 17, and the boost module 13. According to the first feedback signal Bs1, the control module 18 determines that the input voltage Vin is below a preset threshold, and controls the boost module 13 to execute the low-voltage output mode. The aforementioned low-voltage output mode may be a constant-voltage output mode, in which the boost module 13 outputs a constant, relatively low output voltage Vout. According to the first feedback signal Bs1, the control module 18 determines that the input voltage Vin is greater than a preset threshold, and controls the boost module 13 to execute the boost output mode. The above-mentioned preset thresholds can be set and adjusted as needed. In this embodiment, the aforementioned boost output mode may be a constant-voltage output mode, in which the boost module 13 outputs a constant, relatively high output voltage Vout, and the output voltage Vout is greater than the input voltage Vin and the output voltage Vout of the low-voltage output mode. In another embodiment, the boost output mode described above may be a voltage-following mode, in which the boost module 13 outputs a relatively high output voltage Vout. The output voltage Vout is greater than the input voltage Vin and rises linearly according to the input voltage Vin. In one embodiment, the control module 18 is a comparator. In another embodiment, the control module 18 may be a controller such as a microcontroller (MCU), a central processing unit (CPU), an application-specific integrated circuit (ASIC), or a field-programmable gate array (FPGA). In yet another embodiment, the control module 18 may be any other similar component.

[0029] The control module 18 can control the boost module 13 to execute a boost output mode according to a first feedback signal Bs1 and a second feedback signal Bs2. The control module 18 can integrate the first feedback signal Bs1 and the second feedback signal Bs2 to generate an integrated feedback signal. Next, the control module 18 generates a boost control signal Cs according to the integrated feedback signal and controls the boost module 13 to execute a boost output mode.

[0030] Based on the above, the multi-stage boost mechanism (low-voltage output mode and boost output mode) allows the boost module 13 to execute the low-voltage output mode when the input voltage Vin is low, and to execute the boost output mode when the input voltage Vin is greater than the preset threshold, thereby reducing the voltage difference between the input voltage Vin and the output voltage Vout of the boost module 13. Therefore, the power conversion efficiency of the lighting device 1 can be significantly improved.

[0031] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the lighting device with the multi-stage boost mechanism of this embodiment should still be within the scope of protection of the present invention.

[0032] Refer to Figures 3 and 4. Figure 3 is a circuit diagram of a lighting device equipped with a multi-stage boost mechanism according to a second embodiment of the present invention. Figure 4 is an input voltage / output voltage curve diagram of the boost module of a lighting device equipped with a multi-stage boost mechanism according to a second embodiment of the present invention. Refer also to Figures 1 and 2. This embodiment shows one circuit design of lighting device 1, but this embodiment is merely an example, and the circuit design of lighting device 1 can be changed according to actual needs, and the present invention is not limited thereto. As shown in the figures, lighting device 1 includes an input module 11, a rectifier module 12, a boost module 13, a buck module 14, a light-emitting module 15, a first detection module 16, a second detection module 17, and a control module 18. The circuit configurations of each module in this embodiment show only the main electronic components and are illustrative only, and are not used to limit the scope of the patent of the present invention.

[0033] The input module 11 is connected to an external power supply and receives AC voltage from the external power supply. The input module 11 includes a live input terminal Lt and a neutral input terminal Nt.

[0034] The rectifier module 12 is connected to the input module 11 and receives the AC voltage Pin to generate the input voltage Vin. The rectifier module 12 includes a rectifier BD and a fuse Fs.

[0035] The first detection module 16 is connected to the two output terminals of the rectifier module 12 and generates a first feedback signal Bs1 according to the input voltage Vin. The first detection module 16 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1. The first resistor R1, the second resistor R2, and the third resistor R3 are connected in series to form a series circuit, and the fourth resistor R4 and the first capacitor C1 are connected in parallel to form a parallel circuit, and the series circuit and the parallel circuit are connected in series. The parallel circuit is connected to a ground point GND. A first detection point Pt1 is provided between the series circuit and the parallel circuit. The first feedback signal Bs1 can be generated via a voltage divider circuit including the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4.

[0036] The boost module 13 is connected to the rectifier module 12 and the first detection module 16, and receives an input voltage Vin to generate an output voltage Vout. The boost module 13 includes a first diode D1, a second diode D2, a first inductor L1, a third capacitor C3, a first electrolytic capacitor EC1, a first main control switch Q1, and a resistor Rs.

[0037] The second detection module 17 is connected to the boost module 13 and generates a second feedback signal Bs2 according to the output voltage Vout. The second detection module 17 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second capacitor C2. The fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 are connected in series to form a series circuit, and the eighth resistor R8 and the second capacitor C2 are connected in parallel to form a parallel circuit. The parallel circuit is connected to a ground point GND, and the series circuit and the parallel circuit are connected in series. A second detection point Pt2 is located between the series circuit and the parallel circuit. The second feedback signal Bs2 can be generated via a voltage divider circuit including the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8.

[0038] The buck module 14 is connected to the boost module 13 and the second detection module 17. The light-emitting module 15 is connected to the buck module 14. The buck module 14 receives the output voltage Vout and generates a drive voltage Vd to drive the light-emitting module 15. The buck module 14 includes a third diode D3, a second inductor L2, a second electrolytic capacitor EC2, a second main control switch Q2, and a resistor Rk. The light-emitting module 15 includes multiple light-emitting diodes LD.

[0039] The control module 18 is connected to the first detection module 16, the second detection module 17, and the boost module 13. In this embodiment, the control module 18 is a comparator CT. The non-inverting input terminal of the control module 18 is connected to the first detection point Pt1, and the inverting input terminal of the control module 18 is connected to the second detection point Pt2.

[0040] The control module 18 can detect the first feedback signal Bs1 at the first detection point Pt1 and determine the value of the input voltage Vin. If the control module 18 determines, according to the first feedback signal Bs1, that the input voltage Vin is greater than the preset lower limit Vmn but less than the preset threshold Vth, the control module 18 controls the boost module 13 to execute the low-voltage output mode. The low-voltage output mode may be a constant-voltage output mode (as shown in Figure 4, curve X1 represents the input voltage Vin and curve X2 represents the output voltage Vout). In this mode, the output voltage Vout of the boost module 13 is a constant value.

[0041] When the control module 18 determines that the input voltage Vin is greater than a preset threshold Vth according to the first feedback signal Bs1, the non-inverting input terminal and inverting input terminal of the control module 18 receive the first feedback signal Bs1 and the second feedback signal Bs2 from the first detection point Pt1 and the second detection point Pt2, integrate them to generate an integrated feedback signal, and output a boost control signal Cs to the first main control switch Q1 of the boost module 13 to control the boost module 13 and execute the boost output mode. In this embodiment, the first main control switch Q1 is a metal-oxide-semiconductor field-effect transistor (MOSFET), and the boost control signal Cs is output to the gate of the first main control switch Q1. In another embodiment, the first main control switch Q1 may be a triode (BJT). The boost output mode may be a voltage-following mode (as shown in Figure 4, curve X1 represents the input voltage Vin, and curve X2 represents the output voltage Vout). In this mode, the boost module 13 outputs a relatively high output voltage Vout that rises linearly in response to the input voltage Vin. The second feedback signal Bs2 can control the maximum value of the output voltage Vout. At this time, the loss of the boost module 13 is expressed by the following equation (1). P=(Vout-Vin)*Ion (1) Of these, Ion represents the operating current of the boost module 13 and is a fixed value. Therefore, reducing the difference between the input voltage Vin and the output voltage Vout effectively reduces losses and improves power conversion efficiency.

[0042] As can be seen from the above, the multi-stage boost mechanism described above causes the boost module 13 to execute a low-voltage output mode when the input voltage is low, and to execute a boost output mode when the input voltage Vin is greater than the preset threshold, thereby reducing the voltage difference between the input voltage Vin and the output voltage Vout of the boost module 13. Therefore, the power conversion efficiency of the lighting device 1 can be greatly improved. At the same time, the lighting device 1 can utilize energy more efficiently, improving its energy efficiency. Therefore, the lighting device 1 can be more energy-efficient and can meet the needs of environmental protection and future development trends.

[0043] Furthermore, the aforementioned feedback signal integration mechanism allows the control module 18 to accurately perform calculations based on the detection information provided by the first detection module 16 and the second detection module 17, thereby improving the response speed to voltage fluctuations. Consequently, the lighting device 1 can not only effectively improve power conversion efficiency but also prevent stroboscopic phenomena and fluctuations in light intensity, significantly improving the performance of the lighting device 1 to meet the needs of actual applications.

[0044] Furthermore, the lighting device 1 integrates a rectifier module 12, a boost module 13, and a buck module 14, and has the multi-stage boost mechanism and feedback signal integration mechanism described above. In this way, the lighting device 1 not only achieves high luminous efficiency but also improves the power factor and reduces total harmonic distortion (THD), further improving the performance of the lighting device 1 and meeting the needs of actual applications.

[0045] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the lighting device with the multi-stage boost mechanism of this embodiment should still be within the scope of protection of the present invention.

[0046] Furthermore, single-pole power modules are prone to output current fluctuations in complex power grid environments, resulting in phenomena such as strobe and fluctuating light intensity. Therefore, single-pole power modules typically require the addition of a strobe removal circuit to achieve a strobe-free effect, significantly increasing costs and reducing power conversion efficiency. Two-stage power modules can solve the above problems. However, two-stage power modules have low power conversion efficiency under low-voltage input conditions, so to compensate for the reduced power conversion efficiency, it is necessary to increase the number of light sources or use more expensive light sources, similarly increasing the cost of the lighting device. In contrast, according to the first and second embodiments of the present invention, the lighting device includes a light-emitting module, a rectifier module, a first detection module, a boost module, a buck module, and a control module. The rectifier module receives an AC voltage and generates an input voltage. The first detection module generates a first feedback signal based on the input voltage. The boost module receives an input voltage and generates an output voltage. The buck module receives an output voltage and generates a drive voltage to drive the light-emitting module. The control module controls the boost module. The control module controls the boost module to execute a low-voltage output mode when the input voltage is determined to be below a preset threshold based on the first feedback signal, and controls the boost module to perform a boost when the input voltage is above the threshold. The preset threshold is based on the first feedback signal. Due to the multi-stage boost mechanism described above, the boost module can reduce the input by executing a low-voltage output mode when the input voltage is low and a boost output mode when the input voltage is above the preset threshold. The voltage difference between the boost module's voltage and its output voltage. Therefore, the power conversion efficiency of the lighting device can be significantly improved.

[0047] Furthermore, according to the first and second embodiments of the present invention, the lighting device further includes a second detection module. The second detection module generates a second feedback signal based on the output voltage. The control module integrates the first and second feedback signals to generate an integrated feedback signal, and generates a boost control signal based on the integrated feedback signal to control the boost module to perform a boosted output mode. The above feedback signal integration mechanism allows the control module to accurately perform calculations based on the detection information provided by the first and second detection modules, improving the response speed to voltage fluctuations. Therefore, the lighting device can not only effectively improve power conversion efficiency but also prevent stroboscopic phenomena and fluctuations in light intensity, significantly improving the performance of the lighting device to meet the needs of actual applications.

[0048] Furthermore, according to the first and second embodiments of the present invention, the lighting device integrates a rectifier module, a boost module, and a buck module, and has the multi-stage boost mechanism and feedback signal integration mechanism described above. In this way, the lighting device can not only achieve high luminous efficiency, but also improve the power factor and reduce total harmonic distortion, further improving the performance of the lighting device and meeting the needs of actual applications.

[0049] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device can realize the multi-stage boost mechanism and feedback signal integration mechanism described above, and the power conversion efficiency of the lighting device can be significantly improved. In this way, the lighting device can utilize energy more efficiently and improve the energy efficiency of the lighting device. Therefore, the lighting device can become more energy-efficient and meet the requirements of environmental protection and future development trends.

[0050] Furthermore, according to the first and second embodiments of the present invention, the first detection module, the second detection module, and the control module of the lighting device can be implemented with a simple circuit design, thereby realizing the multi-stage boost mechanism and the feedback signal integration mechanism described above. In this way, the lighting device can effectively achieve the desired effect without the need to add a strobe removal circuit or an expensive light source. Therefore, the cost of the lighting device can be significantly reduced, the applications of the lighting device can be broadened, and the requirements of different applications can be met. From the above, it can be seen that a lighting device equipped with a multi-stage boost mechanism according to embodiments of the present invention can certainly achieve excellent technical effects.

[0051] Figure 5 is a circuit diagram of a lighting device equipped with a multi-stage boost mechanism according to a third embodiment of the present invention. Figures 1 and 2 are also referenced. This embodiment shows one circuit design of the lighting device 1, but this embodiment is merely an example, and the circuit design of the lighting device 1 can be modified according to actual needs, and the present invention is not limited thereto. As shown in the figure, the lighting device 1 includes an input module 11, a rectifier module 12, a boost module 13, a buck module 14, a light-emitting module 15, a first detection module 16, a second detection module 17, and a control module 18. The circuit configurations of each module in this embodiment show only the main electronic components and are illustrative only, and are not intended to limit the scope of the patent of the present invention.

[0052] The input module 11 is connected to an external power supply and receives an AC voltage pin from the external power supply. The input module 11 includes a live input terminal Lt and a neutral input terminal Nt.

[0053] The rectifier module 12 is connected to the input module 11 and receives the AC voltage Pin to generate the input voltage Vin. The rectifier module 12 includes a rectifier BD and a fuse Fs.

[0054] The first detection module 16 is connected to the two output terminals of the rectifier module 12 and generates a first feedback signal Bs1 according to the input voltage Vin. The first detection module 16 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a detection switch Qx. The first resistor R1, the second resistor R2, and the third resistor R3 are connected in series to form a series circuit, and the fourth resistor R4 and the first capacitor C1 are connected in parallel to form a parallel circuit, and the series circuit and the parallel circuit are connected in series. The parallel circuit is connected to a ground point GND. A first detection point Pt1 is located between the series circuit and the parallel circuit. In this embodiment, the detection switch Qx is a gold oxide field-effect transistor. In another embodiment, the detection switch Qx may be a triode. The first detection point Pt1 is connected to the gate of the detection switch Qx, the source of the detection switch Qx is connected to the fifth resistor R5, and the drain of the detection switch Qx is connected to the second detection point Pt2 and the boost module 13. The first feedback signal Bs1 described above can be generated via a voltage divider circuit including the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4.

[0055] The boost module 13 is connected to the rectifier module 12 and the first detection module 16, and receives an input voltage Vin to generate an output voltage Vout. The boost module 13 includes a first diode D1, a second diode D2, a first inductor L1, a third capacitor C3, a first electrolytic capacitor EC1, a first main control switch Q1, and a resistor Rs.

[0056] The second detection module 17 is connected to the boost module 13 and generates a second feedback signal Bs2 according to the output voltage Vout. The second detection module 17 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second capacitor C2. The sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are connected in series, with a second detection point Pt2 between the seventh resistor R7 and the eighth resistor R8, and the eighth resistor R8 is connected to a ground point GND. The above-mentioned second feedback signal Bs2 can be generated via a voltage divider circuit including the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8.

[0057] The buck module 14 is connected to the boost module 13 and the second detection module 17. The light-emitting module 15 is connected to the buck module 14. The buck module 14 receives the output voltage Vout and generates a drive voltage Vd to drive the light-emitting module 15. The buck module 14 includes a third diode D3, a second inductor L2, a second electrolytic capacitor EC2, a second main control switch Q2, and a resistor Rk. The light-emitting module 15 includes multiple light-emitting diodes LD.

[0058] The control module 18 is connected to the first detection module 16, the second detection module 17, and the boost module 13. In this embodiment, the control module 18 is a controller CL such as a microcontroller (MCU), central processing unit (CPU), application-specific integrated circuit (ASIC), or field-programmable gate array (FPGA). The input terminals of the control module 18 are connected to the drain of the detection switch Qx and the second detection point Pt2.

[0059] The control module 18 can detect the first feedback signal Bs1 at the first detection point Pt1 and determine the value of the input voltage Vin. If the input voltage Vin is less than the preset threshold Vth, the detection switch Qx is turned off. At this time, the first feedback signal Bs1 is 0, and the control module 18 determines that the input voltage Vin is less than the preset threshold Vth. In this case, the control module 18 controls the boost module 13 and executes the low-voltage output mode. The low-voltage output mode may be a constant-voltage output mode. In this mode, the output voltage Vout of the boost module 13 is a constant value.

[0060] When the input voltage Vin is greater than the preset threshold Vth, the detection switch Qx is turned on. In this case, the fifth resistor R5 of the first detection module 16 and the eighth resistor R8 of the second detection module 17 are connected in parallel, and the control module 18 integrates the first feedback signal Bs1 and the second feedback signal Bs2, outputs a boost control signal Cs to the first main control switch Q1 of the boost module 13, and controls the boost module 13 to execute the boost output mode. The boost output mode may be a constant voltage output mode. In this mode, the boost module 13 outputs a constant, relatively high output voltage Vout, and the output voltage Vout is greater than the input voltage Vin and the output voltage Vout of the low voltage output mode.

[0061] Similarly, the multi-stage boost mechanism described above allows the boost module 13 to execute a low-voltage output mode when the input voltage is low, and a boost output mode when the input voltage Vin is greater than a preset threshold, thereby reducing the voltage difference between the input voltage Vin and the output voltage Vout of the voltage module 13. Therefore, the power conversion efficiency of the lighting device 1 can be significantly improved. At the same time, the lighting device 1 can utilize energy more efficiently, improving its energy efficiency. Thus, the lighting device 1 can be more energy-efficient, conforming to the needs of environmental protection and future development trends.

[0062] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the lighting device with the multi-stage boost mechanism of this embodiment should still be within the scope of protection of the present invention.

[0063] In summary, according to the first, second, and third embodiments of the present invention, the lighting device includes a light-emitting module, a rectifier module, a first detection module, a boost module, a buck module, and a control module. The rectifier module receives an AC voltage and generates an input voltage. The first detection module generates a first feedback signal based on the input voltage. The boost module receives an input voltage and generates an output voltage. The buck module receives an output voltage and generates a drive voltage for driving the light-emitting module. The control module controls the boost module. The control module controls the boost module to perform a low-voltage output mode when it determines that the input voltage is below a preset threshold based on the first feedback signal, and controls the boost module to perform a boost when the input voltage is above the threshold. Preset threshold based on the first feedback signal. Due to the multi-stage boost mechanism described above, the boost module can reduce the input by performing a low-voltage output mode when the input voltage is low and a boost output mode when the input voltage is above the preset threshold. Voltage difference between the voltage of the boost module and the output voltage. Therefore, the power conversion efficiency of the lighting device can be greatly improved.

[0064] Furthermore, according to the first, second, and third embodiments of the present invention, the lighting device further includes a second detection module. The second detection module generates a second feedback signal based on the output voltage. The control module integrates the first and second feedback signals to generate an integrated feedback signal, and generates a boost control signal based on the integrated feedback signal to control the boost module to perform a boosted output mode. The above feedback signal integration mechanism allows the control module to accurately perform calculations based on the detection information provided by the first and second detection modules, improving the response speed to voltage fluctuations. Therefore, the lighting device can not only effectively improve power conversion efficiency but also prevent stroboscopic phenomena and fluctuations in light intensity, significantly improving the performance of the lighting device to meet the needs of actual applications.

[0065] Furthermore, according to the first, second, and third embodiments of the present invention, the lighting device integrates a rectifier module, a boost module, and a buck module, and has the multi-stage boost mechanism and feedback signal integration mechanism described above. In this way, the lighting device can not only achieve high luminous efficiency, but also improve the power factor and reduce total harmonic distortion, further improving the performance of the lighting device and meeting the needs of actual applications.

[0066] Furthermore, according to the first, second, and third embodiments of the present invention, the circuit design of the lighting device can realize the multi-stage boost mechanism and feedback signal integration mechanism described above, and the power conversion efficiency of the lighting device can be significantly improved. In this way, the lighting device can utilize energy more efficiently and improve the energy efficiency of the lighting device. Therefore, the lighting device can become more energy-efficient and conform to the requirements of environmental protection and future development trends.

[0067] Furthermore, according to the first, second, and third embodiments of the present invention, the first detection module, second detection module, and control module of the lighting device can be implemented with a simple circuit design, thereby realizing the multi-stage boost mechanism and feedback signal integration mechanism described above. In this way, the lighting device can effectively achieve the desired effect without the need to add a strobe removal circuit or an expensive light source. Therefore, the cost of the lighting device can be significantly reduced, the applications of the lighting device can be broadened, and the requirements of different applications can be met.

[0068] 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]

[0069] 1. Lighting device 11 Input Modules 12 Rectifier Modules 13 Boost Module 14 Step-down module 15 Light-emitting modules 16. First detection module 17. Second detection module 18 Control Module Lt Live Input Terminal Nt Neutral Input Terminal BD rectifier Fs fuse R1 is the first resistor. R2 2nd resistor R3 3rd resistor R4 4th resistor R5 5th resistor R6 6th resistor R7 7th resistor R8 8th resistor Rs resistance Rk resistance C1 First capacitor C2 Second capacitor C3 Third capacitor EC1 First electrolytic capacitor EC2 Second electrolytic capacitor D1 First Diode D2 Second Bypass D3 Third Diode LD (Light Emitting Diode) CT Comparator CL controller L1 First Inductor L2 Second Inductor Q1 First main control switch Q2 Second main control switch Qx detection switch Pt1 First detection point Pt2 Second detection point GND (Ground) Question AC voltage Vin Input Voltage Vout output voltage Bs1 First Feedback Signal Bs2 Second Feedback Signal Cs boost control signal Vd drive voltage Vth preset threshold Vmn preset lower limit X1 curve X2 curve

Claims

1. Light-emitting module and A rectifier module that receives an AC voltage and generates an input voltage, A first detection module that generates a first feedback signal according to the input voltage, A boost module that receives the aforementioned input voltage and generates an output voltage, A step-down module that receives the output voltage and generates a drive voltage for driving the light-emitting module, A control module that controls the aforementioned boost module, Includes, The control module is If it is determined that the input voltage is below a preset threshold based on the first feedback signal, the boost module is operated in constant voltage output mode. A lighting device with a multi-stage boost mechanism, characterized in that, when it is determined based on the first feedback signal that the input voltage is greater than a preset threshold, the boost module is operated in a boost output mode that boosts the input voltage.

2. The lighting device with a multi-stage boost mechanism according to Claim 1, characterized in that the constant voltage output mode and the boost output mode are operating modes in which the circuit operating states of the boost module are mutually different.

3. The lighting device with a multi-stage boost mechanism according to claim 1, further comprising a second detection module that generates a second feedback signal according to the output voltage, wherein the control module controls the boost module based on the first feedback signal and the second feedback signal to execute the boost output mode.

4. The lighting device with a multi-stage boost mechanism according to claim 3, characterized in that the control module integrates the first feedback signal and the second feedback signal to generate an integrated feedback signal, generates a boost control signal according to the integrated feedback signal, and controls the boost module to execute the boost output mode.

5. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the boost output mode is a voltage-following mode, and the output voltage generated by the boost module is increased in accordance with the input voltage.

6. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the boost output mode is a constant voltage output mode, the output voltage generated by the boost module is constant and greater than the input voltage.

7. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the control module is a comparator.

8. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the control module is a controller.

9. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the light-emitting module is a light-emitting diode or a light-emitting diode array.

10. The lighting device equipped with a multi-stage boost mechanism according to claim 1, characterized in that the rectifier module includes a full-wave rectifier or a half-wave rectifier.

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