LED drive circuit and electronic equipment
By designing an LED driving circuit including modules and control modules, the problem that the prior art cannot adapt to different power supply voltage standards and provide constant current is solved, and an efficient and low-cost LED driving circuit is realized.
Patent Information
- Application Number
- CN202421250179.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-03
AI Technical Summary
The existing LED driver circuits cannot adapt to the supply voltage standards in different regions and cannot provide a constant current, resulting in inefficiency.
An LED driving circuit including a first module, a second module, a switching module, a control module and a driving module is designed. By detecting the driving voltage, the control module outputs corresponding control signals, so that the first module and the second module work in parallel or in series, thereby adapting to different voltage inputs and providing a constant current.
The LED driver circuit adaptability to different voltage inputs is realized, the constant current is provided, the working efficiency is improved, the cost is reduced, and the circuit structure is simplified.
Smart Images
Figure CN222691913U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the utility model relate to the field of LED driving, and in particular to an LED driving circuit and an electronic device. Background Art
[0002] With the development of technology, light-emitting diode (LED) lighting equipment has been widely used in various fields. However, due to different power supply voltage standards in different regions, there are generally two types of voltages used for indoor electricity in countries around the world, namely AC 100V~130V and AC 220~240V, which requires LED driver circuits to be able to adapt to different voltage inputs.
[0003] In addition, in order to ensure the stable operation of the LED, the driving circuit needs to provide a constant current. The existing linear LED driving technology has the defects of being unable to meet the use of two AC voltages or being inefficient. Utility Model Content
[0004] The technical problem mainly solved by the embodiments of the utility model is to provide an LED driving circuit and an electronic device, which can adapt to different voltage inputs and provide a constant current to drive the LED.
[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an LED driving circuit, including a first module, a second module, a switching module, a control module and a driving module, wherein the first module and the second module each include a plurality of light-emitting diodes connected in series; the power input end of the switching module is respectively connected to the first connection end of the first module and the voltage detection end of the control module, the first connection end of the switching module is connected to the second connection end of the first module, the second connection end of the switching module is connected to the first connection end of the second module, the controlled end of the switching module is connected to the first output end of the control module; the first controlled end of the driving module is connected to the second output end of the control module, and the driving module is connected to the first output end of the control module. The second controlled end of the switching module is connected to the third output end of the control module, the first connection end of the driving module is connected to the second connection end of the first module, and the second connection end of the driving module is connected to the second connection end of the second module; the control module is used to output a first control signal to the controlled end of the switching module when it is detected that the driving voltage is in a preset second voltage interval, and output a second control signal and a third control signal to the first controlled end and the second controlled end of the driving module respectively, so that the first module and the second module work in parallel; when it is detected that the driving voltage is in the preset first voltage interval, output a second control signal to the first controlled end of the driving module to make the first module and the second module work in series.
[0006] In an optional manner, the LED driving circuit also includes a sampling module, wherein the first connection end of the sampling module is respectively connected to the first sampling end of the control module and the third connection end of the driving module, the second connection end of the sampling module is respectively connected to the second sampling end of the control module and the fourth end of the driving module, and the third connection end of the sampling module is grounded; when the first module and the second module work in parallel, when it is detected that the level of the first connection end of the sampling module is not equal to the preset first voltage, the control module stops outputting the second control signal, and when it is detected that the level of the second connection end of the sampling module is not equal to the preset second voltage, the control module stops outputting the third control signal; when the first module and the second module work in series, when it is detected that the level of the second connection end of the sampling module is not equal to the preset third voltage, the control module stops outputting the third control signal.
[0007] In an optional manner, the LED driving circuit also includes a fuse module, a rectifier module and a filter module, wherein the first end of the fuse module is connected to the load end of the external power supply, the second end of the fuse module is connected to the first end of the rectifier module, the second end of the rectifier module is connected to the ground end of the external power supply, the third end of the rectifier module is connected to the first end of the filter module and the power input end of the switching module, and the fourth end of the rectifier module is grounded.
[0008] In an optional manner, the control module includes a controller, a second resistor and a fourth resistor, the first input end of the controller is respectively connected to the second end of the second resistor and the first end of the fourth resistor, the first end of the second resistor is connected to the power input end of the switching module, and the second end of the fourth resistor is grounded; the first output end of the controller is connected to the controlled end of the switching module, the second output end of the controller is connected to the first controlled end of the driving module, and the third output end of the controller is connected to the second controlled end of the driving module; the second input end of the controller is connected to the first connection end of the sampling module, and the third input end of the controller is connected to the second connection end of the sampling module.
[0009] In an optional manner, the switching module includes a first resistor, a third resistor, a first switch tube, a first diode and a second diode, the first end of the first resistor and the first end of the first switch tube are connected to the first connection end of the first module, the second end of the first resistor, the first end of the third resistor, the controlled end of the first switch tube and the cathode of the first diode are connected to the first output end of the control module, and the second end of the third resistor is grounded; the second end of the first switch tube, the anode of the first diode and the cathode of the second diode are connected to the first connection end of the second module, and the anode of the second diode is connected to the second connection end of the first module.
[0010] In an optional manner, the driving module includes a second switch tube and a third switch tube, the controlled end of the second switch tube is connected to the second output end of the control module, the first end of the second switch tube is connected to the second connection end of the first module, and the second end of the second switch tube is connected to the first connection end of the sampling module; the controlled end of the third switch tube is connected to the third output end of the control module, the first end of the third switch tube is connected to the second connection end of the second module, and the second end of the third switch tube is connected to the second connection end of the sampling module.
[0011] In an optional manner, the sampling module includes a fifth resistor and a sixth resistor, the first end of the fifth resistor is connected to the third connection end of the driving module, the first end of the sixth resistor is connected to the fourth connection end of the driving module, and the second end of the fifth resistor and the second end of the sixth resistor are grounded.
[0012] In an optional manner, the second voltage range is 141V-183V, and the first voltage range is 310V-338V.
[0013] In an optional manner, the number of light-emitting diodes in the first module is the same as the number of light-emitting diodes in the second module.
[0014] In order to solve the above technical problem, another technical solution adopted by the present invention is: to provide an electronic device, comprising the LED driving circuit as described above.
[0015] The beneficial effects of the embodiments of the utility model are as follows: different from the prior art, the embodiments of the utility model can adapt to different input voltages, control the first module and the second module with a plurality of light-emitting diodes connected in series to work in series or in parallel according to the input voltage, and provide a constant current for the first module and the second module to improve the working efficiency of the LED driving circuit, reduce costs, and simplify the circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of an LED driving circuit provided by an embodiment of the utility model;
[0017] Figure 2 It is a structural schematic diagram of another LED driving circuit provided by an embodiment of the utility model;
[0018] Figure 3 It is a circuit topology diagram of an LED driving circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION
[0019] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.
[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.
[0021] In order to provide a high-efficiency voltage input linear constant current LED drive circuit to adapt to different voltage inputs and provide a constant current, the utility model embodiment provides an LED drive circuit, the structural schematic diagram of which is shown in FIG. Figure 1 As shown, the LED driving circuit includes a first module 100 , a second module 200 , a switching module 300 , a control module 400 and a driving module 500 .
[0022] Among them, the first module 100 and the second module 200 are both light-emitting modules composed of a number of light-emitting diodes connected in series, the power input end of the switching module 300 is respectively connected to the first connection end of the first module 100 and the voltage detection end of the control module 400, the first connection end of the switching module 300 is connected to the second connection end of the first module 100, the second connection end of the switching module 300 is connected to the first connection end of the second module 200, and the controlled end of the switching module 300 is connected to the first output end of the control module 400.
[0023] It should be noted that the number of light emitting diodes in the first module 100 and the number of light emitting diodes in the second module 200 is 1:1.
[0024] The first controlled end of the driving module 500 is connected to the second output end of the control module 400, the second controlled end of the driving module 500 is connected to the third output end of the control module 400, the first connecting end of the driving module 500 is connected to the second connecting end of the first module 100, and the second connecting end of the driving module 500 is connected to the second connecting end of the second module 200.
[0025] In an embodiment of the present application, the driving module 500 is configured to respond to the second control signal and the third control signal output by the control module 400, and respectively turn on the first module 100 and the second module 200 to form a loop; as an example but not a limitation, the driving module 500 can be composed of a plurality of controlled light-opening tubes to form a module with two controlled ends, and one end of the two connecting ends corresponding to the controlled ends is connected to the first module 100 or the second module 200, and the other end is grounded.
[0026] The switch module 300 is configured to connect the first connection end of the second module 200 and the first connection end of the first module 100 in response to the first control signal output by the control module 400, so that the first module 100 and the second module 200 work in parallel. As an example but not limitation, the switching module 300 can be composed of a plurality of controlled opening tubes to form a module with a controlled end, and one end of the two connection ends corresponding to the controlled end is connected to the first connection end of the first module 100, and the other end is connected to the first connection end of the second module 200, so that when the controlled switch tube is turned on, the first module 100 and the second module 200 are connected in parallel; in addition, in order to make the first module 100 and the second module 200 connected in series when the controlled switch tube is turned off, the second end of the first module 100 needs to be connected to the first end of the second module 200. In order to prevent the current of the branch where the second module 200 is located from flowing to the branch where the first module 100 is located when working in parallel, the switching module 300 also needs to set a device with a positive voltage difference and reverse cutoff between the second end of the first module 100 and the first end of the second module 200.
[0027] The control module 400 is used to detect the driving voltage VH. When it is detected that the driving voltage VH is in a preset second voltage interval, the control module 400 outputs a first control signal to the controlled end of the switching module 300, and outputs a second control signal and a third control signal to the first controlled end and the second controlled end of the driving module 500, respectively, so that the first module 100 and the second module 200 work in parallel; when it is detected that the driving voltage is in a preset first voltage interval, the control module 400 outputs a second control signal to the first controlled end of the driving module 500 so that the first module 100 and the second module 200 work in series; when it is detected that the driving voltage VH is not in the preset second voltage interval or the first voltage interval, no control signal is output, that is, the subsequent driving module 500 or the switching module 300 does not work, and thus the first module 1000 and the second module 200 also do not work.
[0028] In the embodiment of the present application, the preset second voltage interval is 141 V-183 V, and the preset first voltage interval is 310 V-338 V. In other embodiments, the first voltage interval and the second voltage interval can be set according to actual application scenarios and requirements.
[0029] Based on the LED driving circuit provided in the above embodiment, the embodiment of the present application provides another LED driving circuit, whose structural schematic diagram is shown in FIG. Figure 2 As shown, the LED driving circuit includes a first module 100 , a second module 200 , a switching module 300 , a control module 400 , a driving module 500 , a sampling module 600 , a fuse module 700 , a rectifying module 800 and a filtering module 900 .
[0030] Among them, the functions of the first module 100, the second module 200, the switching module 300, the control module 400 and the driving module 500 have been described in the previous embodiment, and the connection relationship between the first module 100, the second module 200, the switching module 300, the control module 400 and the driving module 500 remains unchanged, so they are not repeated.
[0031] The first connection end of the sampling module 600 is respectively connected to the first sampling end of the control module 400 and the third connection end of the driving module 500, the second connection end of the sampling module 600 is respectively connected to the second sampling end of the control module 400 and the fourth end of the driving module 500, and the third connection end of the sampling module 600 is grounded.
[0032] The first end of the insurance module 700 is connected to the load end of the external power supply, the second end of the insurance module 700 is connected to the first end of the rectifier module 8000, the second end of the rectifier module 800 is connected to the ground end of the external power supply, the third end of the rectifier module 800 is connected to the first end of the filter module 900 and the power input end of the switching module 300, and the fourth end of the rectifier module 800 is grounded.
[0033] The insurance module 700 is used to introduce the input voltage VIN to prevent the input voltage VIN from being too large; the rectifier module 800 is used to rectify the input voltage VIN and convert it into a DC voltage; the filter module 900 is used to filter the DC voltage obtained by rectification.
[0034] It should be noted that the control module 400 in this embodiment is also used to detect the level of the first connection end of the sampling module 600 and the level of the second connection end of the sampling module 600. Specifically, when the control module 400 detects that the level of the first connection end of the sampling module 600 is not equal to the preset first voltage, the control module 400 stops outputting the second control signal, and when the control module 400 detects that the level of the second connection end of the sampling module 600 is not equal to the preset second voltage, the control module 400 stops outputting the third control signal, the purpose of which is to keep the LED driving circuit working in a linear constant current state; when the first module 100 and the second module 200 work in series, when the control module 400 detects that the level of the second connection end of the sampling module 600 is not equal to the preset third voltage, the control module 400 stops outputting the third control signal, the purpose of which is to keep the LED driving circuit working in a linear constant current state.
[0035] Figure 3 This is a circuit topology diagram of the LED driving circuit provided in the previous embodiment, wherein the first module 100 and the second module 200 are known to be composed of a plurality of light emitting diodes connected in series, and thus will not be described in detail.
[0036] The control module 400 includes a controller 410, a second resistor R2 and a fourth resistor R4. The first input terminal (i.e. Figure 3 The controller 401 shown in FIG. 3 is connected to the second end of the second resistor R2 and the first end of the fourth resistor R4, respectively. The first end of the second resistor R2 and the power input end of the switching module 300 (i.e. Figure 3 The first end of the first resistor R1 and the first end of the first switch tube Q1 are connected to the first end of the first module 100, and the second end of the fourth resistor R4 is grounded; the power input end of the controller 410 (ie Figure 3 The first output terminal of the controller 410 (i.e., the pin 1 of the controller 401) is connected to the external power supply VCC. Figure 3 2 of the controller 401) and the controlled end of the switching module 300 (i.e. Figure 3 The second end of the first resistor R1, the first end of the third resistor R3 and the controlled end of the first switch tube Q1 are connected, and the second output end of the controller 410 (ie Figure 3 7 pin of the controller 401) and the first controlled terminal of the driving module 500 (i.e. Figure 3The controlled end of the second switch tube Q2 is connected to the third output end of the controller 410 (ie Figure 3 8 pin of the controller 401) and the second controlled terminal of the driving module 500 (i.e. Figure 3 The controlled end of the third switch tube Q3 is connected; the second input end of the controller 410 (ie Figure 3 5 pin of the controller 401) and the first connection end (i.e. Figure 3 The first end of the fifth resistor RS1 is connected to the third input terminal of the controller 410 (ie Figure 3 6 pin of the controller 401) and the second connection end of the sampling module (i.e. Figure 3 The first end of the sixth resistor RS2 is connected to the ground end of the controller 410 (ie Figure 3 Pin 4 of the controller 401 is shown as being grounded.
[0037] The switching module 300 includes a first resistor R1, a third resistor R3, a first switch tube Q1, a first diode D1 and a second diode D2. The first end of the first resistor R1 and the first end of the first switch tube Q1 are connected to the first connection end of the first module 100, the second end of the first resistor R1, the first end of the third resistor R3, the controlled end of the first switch tube Q1 and the cathode of the first diode D1 are connected, and the second end of the third resistor R3 is grounded; the second end of the first switch tube Q1, the anode of the first diode D1 and the cathode of the second diode D2 are connected to the first connection end of the second module 200, and the anode of the second diode D2 is connected to the second connection end of the first module 100.
[0038] The driving module 500 includes a second switch tube Q2 and a third switch tube Q3. The first end of the second switch tube Q2 is connected to the second connection end of the first module 100, and the second end of the second switch tube Q2 is connected to the first connection end of the sampling module 600 (i.e. Figure 3 The first end of the third switch tube Q3 is connected to the second connection end of the second module 200, and the second end of the third switch tube Q3 is connected to the second connection end of the sampling module 600 (i.e. Figure 3 The sampling module includes a fifth resistor and a sixth resistor, and the second end of the fifth resistor and the second end of the sixth resistor are grounded.
[0039] The insurance module 700 includes an insurance tube F1, the rectifier module 800 includes a rectifier bridge BD1, and the filter module 900 includes an electrolytic capacitor EC1. The first end of the insurance tube F1 is connected to the load end of the external power supply (ie Figure 3 As shown in FIG. L), the second end of the fuse F1 is connected to the first end of the rectifier bridge BD1 (ie Figure 3 The second end of the rectifier bridge BD1 (i.e. Figure 3 Pin 1 of the rectifier bridge BD1 shown in the figure) is connected to the ground terminal of the external power supply (i.e. Figure 3 N), the third terminal of the rectifier bridge BD1 (i.e. Figure 3 The rectifier bridge BD1 shown in FIG. 2 is connected to the first end of the electrolytic capacitor EC1, the first end of the second resistor R2, the first end of the first resistor R1 and the first end of the first switch tube Q1, and the fourth end of the electrolytic capacitor EC1 and the rectifier bridge BD1 (i.e. Figure 3 Pin 4 of the rectifier bridge BD1 shown is grounded.
[0040] Specifically, the AC input voltage passes through the fuse F1, is rectified by the rectifier bridge BD1, and then is filtered by the electrolytic capacitor EC1 to become a DC drive voltage VH. The voltage value of the drive voltage VH is twice the square root of the input voltage (that is, if the input voltage is 100VAC~130VAC, the drive voltage VH is 141VDC~183VDC, that is, the second voltage range; if the input voltage is 220VAC~240VAC, the drive voltage VH is 310VDC~338VDC, that is, the first voltage range). The controller 410 detects the voltage range of the drive voltage VH after voltage division by the second resistor R2 and the fourth resistor R4. When the voltage does not fall within the above two voltage ranges, the subsequent switching module 300 and the drive module 500 do not work, thereby achieving undervoltage and overvoltage protection.
[0041] The controller 410 detects the voltage range of the driving voltage VH. When the driving voltage VH is 141VDC to 183VDC, the controller 410 outputs a first control signal to turn on the first switch tube Q1, and outputs a second control signal and a third control signal respectively to turn on the second switch tube Q2 and the third switch tube Q3, thereby realizing the parallel operation of the first module 100 and the second module 200. During this process, the controller 410 continuously detects the first feedback voltage generated by the current on the first module 100 on the fifth resistor RS1, and controls the on and off of the second switch tube Q2 by judging whether the first feedback voltage is equal to the preset first voltage, and continuously detects the second feedback voltage generated by the circuit on the second module 200 on the sixth resistor RS2, and controls the on and off of the third switch tube Q3 by judging whether the second feedback voltage is equal to the preset second voltage, thereby making the circuit work in a linear constant current state.
[0042] When the VH voltage is 310VDC~338VDC, the third control signal is output to turn on the third switch tube Q3, so that the first module 100 and the second module 200 work in parallel; in this process, the controller 410 continuously detects the third feedback voltage generated by the circuits on the first module 100 and the second module 200 on the sixth resistor RS2, and controls the conduction and cutoff of the third switch tube Q3 by judging whether the third feedback voltage is equal to the preset third voltage, so that the circuit works in a linear constant current state.
[0043] Because the LED driving circuit works in a linear constant current state, the voltage difference between the driving voltage and the working voltage of the first module 100 and the second module 200 has to be borne by the second switch tube Q2 and the third switch tube Q3. The larger the voltage difference, the lower the efficiency of the LED driving circuit; the smaller the voltage difference, the higher the conversion efficiency and the smaller the energy loss. Therefore, it is necessary to adjust the first module 100 and the second module 200 to work in series or in parallel at different voltage levels.
[0044] Different from the prior art, the embodiment of the utility model can adapt to different input voltages, control the first module and the second module with a plurality of light-emitting diodes connected in series to work in series or in parallel according to the input voltage, and provide a constant current for the first module and the second module to improve the working efficiency of the LED driving circuit, reduce costs, and simplify the circuit structure.
[0045] In other embodiments of the present application, an electronic device is provided, comprising the LED driving circuit as described in any of the above embodiments.
[0046] It should be noted that the preferred embodiments of the utility model are given in the specification and drawings of the utility model, but the utility model can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional restrictions on the content of the utility model. The purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the utility model; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the utility model.
Claims
1. An LED driving circuit, characterized in that: It includes a first module, a second module, a switching module, a control module and a driving module. The first module and the second module each include a plurality of light emitting diodes connected in series; The power input end of the switching module is connected to the first connection end of the first module and the voltage detection end of the control module respectively, the first connection end of the switching module is connected to the second connection end of the first module, the second connection end of the switching module is connected to the first connection end of the second module, and the controlled end of the switching module is connected to the first output end of the control module; The first controlled end of the driving module is connected to the second output end of the control module, the second controlled end of the driving module is connected to the third output end of the control module, the first connecting end of the driving module is connected to the second connecting end of the first module, and the second connecting end of the driving module is connected to the second connecting end of the second module; The control module is used to output a first control signal to the controlled end of the switching module when detecting that the driving voltage is in a preset second voltage interval, and to output a second control signal and a third control signal to the first controlled end and the second controlled end of the driving module respectively, so that the first module and the second module work in parallel; When it is detected that the driving voltage is in a preset first voltage interval, a third control signal is output to the second controlled end of the driving module to enable the first module and the second module to work in series.
2. The circuit according to claim 1, characterized in that Also includes sampling modules, The first connection end of the sampling module is respectively connected to the first sampling end of the control module and the third connection end of the driving module, the second connection end of the sampling module is respectively connected to the second sampling end of the control module and the fourth end of the driving module, and the third connection end of the sampling module is grounded; When the first module and the second module work in parallel, when it is detected that the level of the first connection end of the sampling module is not equal to the preset first voltage, the control module stops outputting the second control signal, and when it is detected that the level of the second connection end of the sampling module is not equal to the preset second voltage, the control module stops outputting the third control signal; When the first module and the second module work in series, when it is detected that the voltage level of the second connection terminal of the sampling module is not equal to the preset third voltage, the control module stops outputting the third control signal.
3. The circuit according to claim 1, characterized in that It also includes insurance module, rectifier module and filter module. The first end of the fuse module is connected to the load end of the external power supply, the second end of the fuse module is connected to the first end of the rectifier module, the second end of the rectifier module is connected to the ground end of the external power supply, the third end of the rectifier module is connected to the first end of the filter module and the power input end of the switching module, and the fourth end of the rectifier module is grounded.
4. The circuit according to claim 2, characterized in that The control module includes a controller, a second resistor and a fourth resistor. The first input terminal of the controller is respectively connected to the second terminal of the second resistor and the first terminal of the fourth resistor, the first terminal of the second resistor is connected to the power input terminal of the switching module, and the second terminal of the fourth resistor is grounded; The first output end of the controller is connected to the controlled end of the switching module, the second output end of the controller is connected to the first controlled end of the driving module, and the third output end of the controller is connected to the second controlled end of the driving module; The second input terminal of the controller is connected to the first connection terminal of the sampling module, and the third input terminal of the controller is connected to the second connection terminal of the sampling module.
5. The circuit according to claim 2, characterized in that The switching module includes a first resistor, a third resistor, a first switch tube, a first diode and a second diode. The first end of the first resistor and the first end of the first switch tube are connected to the first connection end of the first module, the second end of the first resistor, the first end of the third resistor, the controlled end of the first switch tube and the cathode of the first diode are connected to the first output end of the control module, and the second end of the third resistor is grounded; The second end of the first switch tube, the anode of the first diode, and the cathode of the second diode are connected to the first connection end of the second module, and the anode of the second diode is connected to the second connection end of the first module.
6. The circuit according to claim 2, characterized in that The driving module includes a second switch tube and a third switch tube. The controlled end of the second switch tube is connected to the second output end of the control module, the first end of the second switch tube is connected to the second connection end of the first module, and the second end of the second switch tube is connected to the first connection end of the sampling module; The controlled end of the third switch tube is connected to the third output end of the control module, the first end of the third switch tube is connected to the second connection end of the second module, and the second end of the third switch tube is connected to the second connection end of the sampling module.
7. The circuit according to claim 2, characterized in that The sampling module includes a fifth resistor and a sixth resistor, The first end of the fifth resistor is connected to the third connection end of the driving module, the first end of the sixth resistor is connected to the fourth connection end of the driving module, and the second end of the fifth resistor and the second end of the sixth resistor are grounded.
8. The circuit according to claim 1, characterized in that The second voltage range is 141V-183V, and the first voltage range is 310V-338V.
9. The circuit according to any one of claims 1 to 8, characterized in that: The number of light emitting diodes in the first module is the same as the number of light emitting diodes in the second module.
10. An electronic device, characterized in that: The invention comprises the LED driving circuit as claimed in any one of claims 1 to 9.