Lighting device having a multi-stage 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 (step-down converter or boost / step-down converter) or a two-stage power module (boost converter and step-down converter). The single-pole power module is likely to have a fluctuating output current in a complex power grid environment, resulting in phenomena such as stroboscopic and fluctuating light intensity. Therefore, the single-pole power module usually needs to add a stroboscopic removal circuit to achieve the effect of no stroboscopic, which greatly increases the cost and reduces the power conversion efficiency.

[0003] The two-stage power module can solve the above problems. However, since the two-stage power module has a low power conversion efficiency under low-voltage input conditions, in order 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 similarly increases the cost of the lighting device.

[0004] Both Specification of Chinese Patent Application Publication No. 1868107 and Specification of 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 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a lighting device provided with a multi-stage boosting mechanism.

Means for Solving the Problems

[0007] The present invention provides a lighting device provided with a multi-stage boosting mechanism including a light emitting module, a rectifying module, a first detection module, a boosting module, a buck module, and a control module. The rectifying 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 boosting module receives the input voltage and generates an output voltage. The buck module receives the output voltage and generates a driving voltage for driving the light emitting module. The control module controls the boosting module. When it is determined based on the first feedback signal that the input voltage is less than a preset threshold value, the control module controls the boosting module to execute a low voltage output mode. When it is determined based on the first feedback signal that the input voltage is greater than the preset threshold value, the control module controls the boosting module to execute a boosting output mode.

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

[0009] Based on an improvement of the present invention, it further includes a second detection module. The second detection module generates a second feedback signal according to the output voltage. The control module controls the boosting module to execute a boosting output mode based on the first feedback signal and the second feedback signal.

[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 boosting control signal according to the integrated feedback signal, and controls the boosting module to execute a boosting output mode.

[0011] Based on an improvement of the present invention, the boost output mode is a voltage following mode, and the output voltage generated by the boost module is increased by following the input voltage.

[0012] Based on an improvement of the present invention, the boost output mode is a constant voltage output mode, and 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 members.

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

Advantages of the Invention

[0017] Based on the above, the lighting device provided with the 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 rectifying module, a first detection module, a boosting module, a buck module, and a control module. The rectifying 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 boosting module receives the input voltage and generates an output voltage. The buck module receives the output voltage and generates a driving voltage for driving the light emitting module. The control module controls the boosting module. When it is determined that the input voltage is less than a preset threshold based on the first feedback signal, the control module controls the boosting module to execute a low voltage output mode, and when the input voltage is greater than a threshold value, the control module controls the boosting module to execute boosting. A preset threshold based on the first feedback signal. With the above multi-stage boosting mechanism, when the input voltage is low, the boosting module executes a low voltage output mode, and when the input voltage is higher than the preset threshold, the boosting module executes a boosting output mode to reduce the input. The voltage difference between the voltage of the boosting 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, generates a boost control signal based on the integrated feedback signal, and controls the boost module to execute a boost output mode. With the above feedback signal integration mechanism, the control module can accurately perform calculations based on the detection information provided by the first detection module and the second detection module, and the response speed to voltage fluctuations is improved. Therefore, the lighting device can not only effectively improve the power conversion efficiency, but also prevent stroboscopic phenomena and fluctuations in light intensity, and greatly improve 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 rectification 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 the total harmonic distortion, further improving the performance of the lighting device and meeting the requirements of actual applications. (4) According to the disclosure of the present invention, the circuit design of the lighting device can realize the above-mentioned multi-stage boost mechanism and feedback signal integration mechanism, and can greatly improve the power conversion efficiency of the lighting device. In this way, the lighting device can use energy more efficiently and improve the energy efficiency of the lighting device. Therefore, the lighting device can be more energy-saving and can meet the requirements of environmental protection and the future development trend. (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, and the above-mentioned multi-stage boost mechanism and feedback signal integration mechanism can be realized. In this way, the lighting device can effectively achieve the desired effect, and there is no need to add a stroboscopic removal circuit or an expensive light source. Therefore, the cost of the lighting device can be greatly reduced, the application of the lighting device can be made more extensive, and the requirements of different applications can be met.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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 to enable its implementation accordingly. Moreover, through 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] In the following, with reference to the related drawings, embodiments of a lighting device equipped with a multi-stage boosting mechanism of the present invention will be described. However, for the sake of easy understanding and easy illustration in the drawings, the members 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 a member is described as "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or there may be an intervening member. When a member is described as "directly connected" or "directly coupled" to another member, there is no intervening member, and the same should be interpreted in the same way 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 equipped with a multi-stage boosting mechanism according to the first embodiment of the present invention. As shown in the figure, 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 rectification module 12 is connected to the input module 11. The rectification module 12 receives the AC voltage Pin and generates the input voltage Vin. In one embodiment, the rectification module 12 includes a full-wave rectifier. In another embodiment, the rectification module 12 may include a half-wave rectifier.

[0024] The first detection module 16 is connected to the rectification 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 rectification 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 driving voltage Vd for driving 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 components.

[0028] The control module 18 is connected to the first detection module 16, the second detection module 17, and the boost module 13. When the control module 18 determines according to the first feedback signal Bs1 that the input voltage Vin is less than a preset threshold value, it 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 this mode, the boost module 13 outputs a certain relatively low output voltage Vout. When the control module 18 determines according to the first feedback signal Bs1 that the input voltage Vin is greater than a preset threshold value, it controls the boost module 13 to execute the boost output mode. The above preset threshold value can be set and adjusted according to actual needs. In this embodiment, the aforementioned boost output mode may be a constant-voltage output mode. In this mode, the boost module 13 outputs a certain 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 aforementioned boost output mode may be a voltage tracking mode. In this mode, the boost module 13 outputs a relatively high output voltage Vout. The output voltage Vout is greater than the input voltage Vin and linearly increases 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 other similar components.

[0029] The control module 18 can control the boost module 13 to execute the boost output mode according to the first feedback signal Bs1 and the second feedback signal Bs2. Among them, 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 the boost output mode.

[0030] From the above, through the multi-stage boosting mechanism (low-voltage output mode and boosting output mode) described above, the boosting module 13 can execute the low-voltage output mode when the input voltage Vin is low, and when the input voltage Vin is greater than the preset threshold value, execute the boosting output mode to reduce the voltage difference between the input voltage Vin and the output voltage Vout of the boosting module 13. Therefore, the power conversion efficiency of the lighting device 1 can be significantly improved.

[0031] Naturally, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device equipped with the multi-stage boosting mechanism of this embodiment should still be included in the protection scope of the present invention.

[0032] Refer to FIGS. 3 and 4. FIG. 3 is a circuit diagram of a lighting device equipped with the multi-stage boosting mechanism of the second embodiment of the present invention. FIG. 4 is an input voltage / output voltage curve diagram of the boosting module of the lighting device equipped with the multi-stage boosting mechanism of the second embodiment of the present invention. Also refer to FIGS. 1 and 2 together. This embodiment shows a circuit design of the lighting device 1, but this embodiment is only an example, and the circuit design of the lighting device 1 can be changed 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 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. The circuit configuration of each module in this embodiment only shows the main electronic components and is only for illustration and is not used to limit the patent scope of the present invention.

[0033] The input module 11 is connected to an external power supply and receives an 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 rectification module 12 is connected to the input module 11, receives the AC voltage Pin, and generates the input voltage Vin. The rectification module 12 includes a rectifier BD and a fuse Fs.

[0035] The first detection module 16 is connected to two output terminals of the rectification 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. The fourth resistor R4 and the first capacitor C1 are connected in parallel to form a parallel circuit. The series circuit and the parallel circuit are connected in series. The parallel circuit is connected to the ground point GND. There is a first detection point Pt1 between the series circuit and the parallel circuit. The above-mentioned first feedback signal Bs1 can be generated through a voltage division 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 rectification module 12 and the first detection module 16, receives the input voltage Vin, and generates 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 the ground point GND, and the series circuit and the parallel circuit are connected in series. A second detection point Pt2 is provided between the series circuit and the parallel circuit. The above-mentioned second feedback signal Bs2 can be generated through a voltage division 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 driving voltage Vd for driving 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 a plurality of 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 of the first detection point Pt1 and determine the value of the input voltage Vin. When the control module 18 determines, according to the first feedback signal Bs1, that the input voltage Vin is greater than the preset lower limit value Vmn but less than the preset threshold value 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 FIG. 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, according to the first feedback signal Bs1, that the input voltage Vin is greater than the preset threshold value Vth, the non-inverting input terminal and the inverting input terminal of the control module 18 receive and integrate the first feedback signal Bs1 and the second feedback signal Bs2 from the first detection point Pt1 and the second detection point Pt2 to generate an integrated feedback signal, and output the boost control signal Cs to the first main control switch Q1 of the boost module 13 to control the boost module 13 to 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 bipolar junction transistor (BJT). The boost output mode may be a voltage tracking mode (as shown in FIG. 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 following 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 represented by the following formula (1). P=(Vout-Vin)*Ion (1) Among these, Ion represents the operating current of the boost module 13 and is a fixed value. Therefore, when the difference between the input voltage Vin and the output voltage Vout is reduced, the loss is effectively reduced and the power conversion efficiency is improved.

[0042] As can be seen from the above, with the above-described multi-stage boost mechanism, the boost module 13 executes the low-voltage output mode when the input voltage is low, and executes the boost output mode when the input voltage Vin is greater than the preset threshold value, 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. At the same time, the lighting device 1 can utilize energy more effectively, and the energy efficiency of the lighting device 1 is improved. Therefore, the lighting device 1 can be more energy-saving and can meet the requirements of environmental protection and the trend of future development.

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

[0044] Also, the lighting device 1 integrates the rectification module 12, the boost module 13, and the buck module 14, and has the above-described multi-stage boost mechanism and feedback signal integration mechanism. In this way, the lighting device 1 can not only achieve high luminous efficiency, but also improve the power factor and reduce the total harmonic distortion (THD), further improving the performance of the lighting device 1 and meeting the requirements of actual applications.

[0045] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the multi-stage boosting mechanism of this embodiment should still be included in the protection scope of the present invention.

[0046] Note that in a complex power grid environment, the output current of a single-pole power module is likely to fluctuate, resulting in phenomena such as stroboscopic and light intensity fluctuations. Therefore, usually, a single-pole power module needs to add a stroboscopic removal circuit to achieve the effect of no stroboscopic, which significantly increases the cost and reduces the power conversion efficiency. A two-stage power module can solve the above problems. However, since the two-stage power module has low power conversion efficiency under low voltage input conditions, in order to compensate for the above-mentioned 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. In comparison, according to the first and second embodiments of the present invention, the lighting device includes a light-emitting module, a rectifying module, a first detection module, a boosting module, a bucking module, and a control module. The rectifying 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 boosting module receives the input voltage and generates an output voltage. The bucking module receives the output voltage and generates a driving voltage for driving the light-emitting module. The control module controls the boosting module. When it is determined that the input voltage is less than a preset threshold based on the first feedback signal, the control module controls the boosting module to execute a low voltage output mode. When the input voltage is greater than the threshold value, the control module controls the boosting module to execute boosting. A preset threshold based on the first feedback signal. Due to the above-mentioned multi-stage boosting mechanism, when the input voltage is low, the boosting module executes a low voltage output mode, and when the input voltage is higher than the preset threshold, the boosting module executes a boosting output mode to reduce the input. The voltage difference between the voltage of the boosting module and the output voltage. Therefore, the power conversion efficiency of the lighting device can be significantly improved.

[0047] Also, 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 feedback signal and the second feedback signal to generate an integrated feedback signal, generates a boost control signal based on the integrated feedback signal, and controls the boost module to execute a boost output mode. With the above feedback signal integration mechanism, the control module can accurately perform calculations based on the detection information provided by the first detection module and the second detection module, and the response speed to voltage fluctuations is improved. Therefore, the lighting device can not only effectively improve the power conversion efficiency, but also prevent stroboscopic phenomena and fluctuations in light intensity, and can greatly improve the performance of the lighting device to meet the requirements of actual applications.

[0048] Also, according to the first and second embodiments of the present invention, the lighting device integrates a rectification module, a boost module, and a buck module, and has the above-described 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 the total harmonic distortion, further improving the performance of the lighting device and meeting the requirements of actual applications.

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

[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, and the above-described multi-stage boost mechanism and feedback signal integration mechanism can be realized. In this way, the lighting device can effectively achieve the desired effect, and there is no need to add a stroboscopic removal circuit or an expensive light source. Therefore, the cost of the lighting device can be significantly reduced, the application of the lighting device can be made more extensive, and the requirements of different applications can be satisfied. From the above, it can be seen that the lighting device provided with the multi-stage boost mechanism according to the embodiment of the present invention can surely achieve excellent technical effects.

[0051] FIG. 5 is a circuit diagram of a lighting device provided with a multi-stage boost mechanism according to the third embodiment of the present invention. Also refer to FIGS. 1 and 2 simultaneously. This embodiment shows a circuit design of the lighting device 1, but this embodiment is only an example, and the circuit design of the lighting device 1 can be changed 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 rectification 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 configuration of each module in this embodiment shows only the main electronic components and is only an example, and is not used to limit the patent scope 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 rectification module 12 is connected to the input module 11, receives the AC voltage Pin, and generates an input voltage Vin. The rectification module 12 includes a rectifier BD and a fuse Fs.

[0054] The first detection module 16 is connected to two output terminals of the rectification 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. The fourth resistor R4 and the first capacitor C1 are connected in parallel to form a parallel circuit. The series circuit and the parallel circuit are connected in series. The parallel circuit is connected to the ground point GND. There is a first detection point Pt1 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. The drain of the detection switch Qx is connected to the second detection point Pt2 and the boost module 13. The above-mentioned first feedback signal Bs1 can be generated through a voltage dividing 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 rectification module 12 and the first detection module 16, receives the input voltage Vin, and generates 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. There is a second detection point Pt2 between the seventh resistor R7 and the eighth resistor R8. The eighth resistor R8 is connected to the ground point GND. The above-mentioned second feedback signal Bs2 can be generated through a voltage dividing 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 for driving 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 a plurality of 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), a central processing unit (CPU), an application specific integrated circuit (ASIC), or a field programmable gate array (FPGA). The input terminal of the control module 18 is 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 of the first detection point Pt1 and determine the value of the input voltage Vin. When the input voltage Vin is less than the preset threshold Vth, the detection switch Qx turns 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 to execute a 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 value Vth, the detection switch Qx turns 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, enabling the control module 18 to integrate the first feedback signal Bs1 and the second feedback signal Bs2 and output a boost control signal Cs to the first main control switch Q1 of the boost module 13, thereby controlling the boost module 13 to execute a boost output mode. The boost output mode may be a constant voltage output mode. In this mode, the boost module 13 outputs a certain relatively high output voltage Vout, which is greater than the input voltage Vin and the output voltage Vout in the low voltage output mode.

[0061] Similarly, with the above-described multi-stage boost mechanism, when the input voltage is low, the boost module 13 executes a low voltage output mode, and when the input voltage Vin is greater than the preset threshold value, the boost module 13 executes a boost output mode, 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 effectively, improving the energy efficiency of the lighting device 1. Thus, the lighting device 1 can be more energy-saving and can meet the requirements of environmental protection and the trend of future development.

[0062] Naturally, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device with the multi-stage boost mechanism of this embodiment should still be included within the protection scope 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 rectifying module, a first detection module, a boosting module, a bucking module, and a control module. The rectifying 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 boosting module receives the input voltage and generates an output voltage. The bucking module receives the output voltage and generates a driving voltage for driving the light-emitting module. The control module controls the boosting module. When it is determined that the input voltage is less than a preset threshold based on the first feedback signal, the control module controls the boosting module to execute a low-voltage output mode. When the input voltage is greater than the threshold value, the control module controls the boosting module to execute boosting. A preset threshold based on the first feedback signal. Due to the above multi-stage boosting mechanism, when the input voltage is low, the boosting module executes a low-voltage output mode, and when the input voltage is higher than the preset threshold, the boosting module executes a boosting output mode to reduce the input. The voltage difference between the voltage of the boosting module and the output voltage. Therefore, the power conversion efficiency of the lighting device can be significantly improved.

[0064] Also, 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 feedback signal and the second feedback signal to generate an integrated feedback signal, generates a boosting control signal based on the integrated feedback signal, and controls the boosting module to execute a boosting output mode. With the above feedback signal integration mechanism, the control module can accurately perform calculations based on the detection information provided by the first detection module and the second detection module, and the response speed to voltage fluctuations is improved. Therefore, the lighting device can not only effectively improve the power conversion efficiency, but also prevent stroboscopic phenomena and fluctuations in light intensity, and can significantly improve the performance of the lighting device to meet the needs of actual applications.

[0065] Also, according to the first, second, and third embodiments of the present invention, the lighting device integrates a rectification module, a boost module, and a buck module, and has the above-described 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 the total harmonic distortion, further improving the performance of the lighting device and meeting the requirements of actual applications.

[0066] Also, according to the first, second, and third embodiments of the present invention, the circuit design of the lighting device can realize the above-described multi-stage boost mechanism and feedback signal integration mechanism, and can greatly improve the power conversion efficiency of the lighting device. In this way, the lighting device can use energy more efficiently and improve the energy efficiency of the lighting device. Therefore, the lighting device can be more energy-saving and can meet 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, the second detection module, and the control module of the lighting device are implemented with a simple circuit design, and the above-described multi-stage boost mechanism and feedback signal integration mechanism can be realized. In this way, the lighting device can effectively achieve the desired effect, and there is no need to add a stroboscopic removal circuit or an expensive light source. Therefore, the cost of the lighting device can be greatly reduced, the application of the lighting device can be made more extensive, and the requirements of different applications can be met.

[0068] It should be noted that although the above embodiments are described in this specification, they do not limit the scope of the claims of the present invention. Therefore, any changes and modifications to the embodiments described in this specification based on the innovative concept of the present invention, or substitutions of equivalent structures or equivalent processes made using the content of the specification and drawings of the present invention, and the direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of the claims of the present invention.

Explanation of Reference Numerals

[0069] 1 Lighting device 11 Input module 12 Rectification module 13 Boost module 14 Buck module 15 Light-emitting module 16 First detection module 17 Second detection module 18 Control module Lt Live input terminal Nt Neutral input terminal BD Rectifier Fs Fuse R1 First resistor R2 Second resistor R3 Third resistor R4 Fourth resistor R5 Fifth resistor R6 Sixth resistor R7 Seventh resistor R8 Eighth resistor Rs Resistor Rk Resistor C1 First capacitor C2 Second capacitor C3 Third capacitor EC1 First electrolytic capacitor EC2 Second electrolytic capacitor D1 First diode D2 Second diode 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 Pin 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 value Vmn Preset lower limit value X1 Curve X2 Curve

Claims

1. A light emitting module, a rectifying module that receives an alternating voltage and generates an input voltage, a first detection module that generates a first feedback signal according to the input voltage, a boosting module that receives the input voltage and generates an output voltage, a bucking module that receives the output voltage and generates a driving voltage for driving the light emitting module, a control module that controls the boosting module, comprising, when it is determined based on the first feedback signal that the input voltage is less than a preset threshold value, the control module controls the boosting module to execute a low voltage output mode, and when it is determined based on the first feedback signal that the input voltage is greater than the preset threshold value, the control module controls the boosting module to execute a boosting output mode. A lighting device with a multi-stage boosting mechanism is characterized in that.

2. The lighting device with a multi-stage boosting mechanism according to claim 1, wherein the low voltage output mode is a constant voltage output mode.

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

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

5. The lighting device with a multi-stage boosting mechanism according to claim 1, wherein the boosting output mode is a voltage tracking mode, and the output voltage generated by the boosting module is increased following the input voltage.

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

7. The lighting device with a multi-stage boosting mechanism according to claim 1, wherein the control module is a comparator.

8. The lighting device provided with the multi-stage boosting mechanism according to claim 1, wherein the control module is a controller.

9. The lighting device provided with the multi-stage boosting mechanism according to claim 1, wherein the light source module is a light-emitting diode or a light-emitting diode array.

10. The lighting device provided with the multi-stage boosting mechanism according to claim 1, wherein the rectification module includes a full-wave rectifier or a half-wave rectifier.

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