LED driving power supply and dimming control circuit thereof

Abstract

The utility model relates to an LED driving power supply and a dimming control circuit thereof. The LED driving power supply comprises a voltage stabilizing module, a voltage dividing module, a mode switching module, a current limiting module, an external dimming input interface and an output module. The voltage stabilization module is used for carrying out voltage stabilization processing on the power supply signal to obtain an input signal; the mode switching module is used for performing mode switching according to the switching signal; the voltage division module performs voltage division on the input signal according to the switching operation of the mode switching module so as to generate internal dimming voltages of different gears; and the output module outputs a driving dimming signal or a driven dimming signal according to the internal dimming voltage transmitted by the external dimming input interface or the accessed external dimming voltage. According to the utility model, the voltage dividing module is matched with the mode switching module, so that various dimming modes can be switched as required, and the requirements of uniformly changing the brightness by using the dimming bus and independently adjusting the brightness of a single lamp can be met.

Description

Technical Field

[0001] This utility model relates to the technical field of LED driver power supply dimming, and more specifically, to an LED driver power supply and its dimming control circuit. Background Technology

[0002] In lighting applications, to adapt to the needs of various lighting occasions, lighting systems are also developing towards automation and intelligent control. To meet the needs of various applications, lighting manufacturers in the lighting field require lighting fixtures to be designed to support multiple dimming modes, in order to meet the needs of different application occasions and environmental changes, as well as to facilitate inventory preparation for end customers.

[0003] However, existing LED driver power supplies primarily use dimming technology that alters the brightness of all luminaires by changing the dimming bus. This dimming mode cannot satisfy the need for both unified brightness adjustment via the dimming bus and individual brightness adjustment of a single luminaire. Therefore, existing dimming solutions cannot meet the design requirements of luminaires. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an LED driver power supply and its dimming control circuit, which addresses the problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a dimming control circuit for an LED driver power supply, including: a voltage regulator module, a voltage divider module, a mode switching module, a current limiting module, an external dimming input interface, and an output module;

[0006] The input terminal of the voltage regulator module is connected to the power supply signal, and the output terminal of the voltage regulator module is connected to the voltage divider module and the current limiting module. The mode switching module is connected to the voltage divider module, the external adjustment input interface and the output module respectively. The external dimming input interface is connected to the current limiting module and the output module respectively.

[0007] The voltage regulator module is used to regulate the power supply signal to obtain the input signal;

[0008] The mode switching module is used to switch modes according to the switching signal;

[0009] The voltage divider module is used to divide the input signal according to the switching operation of the mode switching module to generate internal dimming voltages of different levels; the current limiting module is connected in parallel with the voltage divider module;

[0010] The output module is used to output an active dimming signal or a passive dimming signal based on the internal dimming voltage transmitted through the external dimming input interface or the external dimming voltage received.

[0011] In the dimming control circuit of the LED driver power supply described in this utility model, the output module includes: a voltage follower circuit, a protection circuit, and an output circuit;

[0012] The input terminal of the voltage follower circuit is connected to the external dimming input interface, the output terminal of the voltage follower circuit is connected to the input terminal of the protection circuit, the output terminal of the protection circuit is connected to the input terminal of the output circuit, and the input terminal of the output circuit is also connected to the mode switching module.

[0013] In the dimming control circuit of the LED driver power supply described in this utility model, the mode switching module includes: a mode switching switch;

[0014] The mode switching switch includes: a first switching port, a second switching port, a third switching port, a fourth switching port, a fifth switching port, a sixth switching port, a seventh switching port, an eighth switching port, and a connection to the master node;

[0015] The first switching port, the second switching port, the third switching port, the fourth switching port and the fifth switching port are respectively connected to the voltage divider module, the sixth switching port is connected to the input terminal of the output circuit, the first switching port and the eighth switching port are left floating, and the main connection node is connected to the external dimming interface.

[0016] In the dimming control circuit of the LED driver power supply described in this utility model, the voltage divider module includes: a first voltage divider circuit, a second voltage divider circuit, a third voltage divider circuit, a fourth voltage divider circuit, and a current limiting circuit.

[0017] The input terminals of the first voltage divider circuit, the second voltage divider circuit, the third voltage divider circuit, the fourth voltage divider circuit, and the current limiting circuit are all connected to the output terminal of the voltage regulator module.

[0018] The output of the current limiting circuit is connected to the fifth switching port, the output of the first voltage divider circuit is connected to the fourth switching port, the output of the second voltage divider circuit is connected to the third switching port, the output of the third voltage divider circuit is connected to the second switching port, and the output of the fourth voltage divider circuit is connected to the first switching port.

[0019] In the dimming control circuit of the LED driver power supply described in this utility model, the voltage regulator module includes: a first capacitor, a second capacitor, a third capacitor, an input resistor, a second resistor, a third resistor, a ninth resistor, a tenth resistor, a transistor, and a reference.

[0020] The emitter of the transistor is connected to the power supply signal through the input resistor. The base of the transistor is connected to the first terminal of the reference. The third terminal of the reference is grounded. The first terminal of the second resistor and the first terminal of the second capacitor are connected to the power supply signal. The second terminal of the second resistor is connected to the base of the transistor. The second terminal of the second capacitor is grounded. The first capacitor and the third resistor are connected in series between the base and emitter of the transistor. The first terminal of the ninth resistor is connected to the second terminal of the reference. The second terminal of the ninth resistor is grounded. The first terminal of the tenth resistor is connected to the first terminals of the third resistor and the ninth resistor. The second terminal of the tenth resistor is grounded. The first terminal of the third capacitor is connected to the emitter of the transistor. The second terminal of the third capacitor is grounded.

[0021] The first terminal of the second capacitor is the input terminal of the voltage regulator module, and the first terminal of the third capacitor is the output terminal of the voltage regulator module.

[0022] In the dimming control circuit of the LED driver power supply described in this utility model, the first voltage divider circuit includes: a fourth resistor and an eleventh resistor; the second voltage divider circuit includes: a fifth resistor and a thirteenth resistor; the third voltage divider circuit includes: a sixth resistor and a fifteenth resistor; the fourth voltage divider circuit includes: a seventh resistor and an eighteenth resistor; and the current limiting circuit includes: an eighth resistor.

[0023] The first ends of the fourth, fifth, sixth, seventh, and eighth resistors are all connected to the output terminal of the voltage regulator module. The second end of the fourth resistor is connected to the first end of the eleventh resistor and the fourth switching port, and the second end of the eleventh resistor is grounded. The second end of the fifth resistor is connected to the first end of the thirteenth resistor and the third switching port, and the thirteenth resistor is grounded. The second end of the sixth resistor is connected to the second switching port and the first end of the fifteenth resistor, and the second end of the fifteenth resistor is grounded. The second end of the seventh resistor is connected to the first switching port and the eighteenth resistor, and the eighteenth resistor is grounded. The second end of the eighth resistor is connected to the fifth switching port.

[0024] In the dimming control circuit of the LED driver power supply described in this utility model, the current limiting module includes: a first resistor;

[0025] The first end of the first resistor is connected to the output end of the voltage regulator module, and the second end of the first resistor is connected to the external dimming input interface and the connection master node.

[0026] In the dimming control circuit of the LED driver power supply described in this utility model, the voltage follower circuit includes: a nineteenth resistor, a twentieth resistor, a fourth capacitor, a fifth capacitor, and a voltage follower.

[0027] The first end of the nineteenth resistor is connected to the power supply signal, and the second end of the nineteenth resistor is connected to the first end of the fourth capacitor and the power supply terminal of the voltage follower. The fourth capacitor is grounded. The first end of the twentieth resistor is connected to the external dimming input interface, and the second end of the twentieth resistor is connected to the fifth capacitor and the positive input terminal of the voltage follower. The second end of the fifth capacitor is grounded. The negative input terminal of the voltage follower is connected to its output terminal, and the output terminal of the voltage follower is connected to the input terminal of the protection circuit.

[0028] In the dimming control circuit of the LED driver power supply described in this utility model, the protection circuit includes a diode and a Zener diode; the output circuit includes a 21st resistor and a fuse.

[0029] The anode of the diode is connected to the output terminal of the voltage follower, the cathode of the diode is connected to the cathode of the Zener diode and the input terminal of the fuse, and the anode of the Zener diode is grounded; the input terminal of the fuse is also connected to the mode switching module, the output terminal of the fuse is connected to the dimming circuit, the input terminal of the 21st resistor is connected to the input terminal of the fuse, and the output terminal of the 21st resistor is grounded.

[0030] This utility model also provides an LED driver power supply, including: the dimming control circuit of the LED driver power supply described above.

[0031] The LED driver power supply and its dimming control circuit of this utility model have the following beneficial effects: It includes a voltage regulator module, a voltage divider module, a mode switching module, a current limiting module, an external dimming input interface, and an output module. The voltage regulator module is used to regulate the power supply signal to obtain the input signal. The mode switching module is used to switch modes according to the switching signal. The voltage divider module divides the input signal according to the switching operation of the mode switching module to generate internal dimming voltages of different levels. The output module outputs an active dimming signal or a passive dimming signal according to the internal dimming voltage transmitted from the external dimming input interface or the external dimming voltage input. This utility model, by setting the voltage divider module and the mode switching module to work together, can switch between multiple dimming modes as needed, satisfying both the need to uniformly change the brightness using a dimming bus and the need to individually adjust the brightness of a single lamp. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0033] Figure 1 This is a schematic block diagram of the dimming control circuit of the LED driver power supply provided by this utility model.

[0034] Figure 2 This is a circuit diagram of the dimming control circuit for the LED driver power supply provided by this utility model. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] refer to Figure 1 , Figure 1 This is a schematic block diagram of the dimming control circuit of the LED driver power supply provided by this utility model.

[0037] Specifically, such as Figure 1 As shown, the dimming control circuit of the LED driver power supply includes: a voltage regulator module 11, a voltage divider module 12, a mode switching module 13, a current limiting module 14, an external dimming input interface, and an output module 15. The input terminal of the voltage regulator module 11 is connected to the power supply signal, and the output terminal of the voltage regulator module 11 is connected to the voltage divider module 12 and the current limiting module 14. The mode switching module 13 is connected to the voltage divider module 12, the external dimming input interface, and the output module 15, respectively. The external dimming input interface is connected to the current limiting module 14 and the output module 15, respectively.

[0038] In this embodiment of the invention, the voltage regulator module 11 is used to regulate the power supply signal to obtain the input signal; the mode switching module 13 is used to switch modes according to the switching signal; the voltage divider module 12 is used to divide the input signal according to the switching operation of the mode switching module 13 to generate internal dimming voltages of different levels; the current limiting module 14 is connected in parallel with the voltage divider module 12; and the output module 15 is used to output an active dimming signal or a passive dimming signal according to the internal dimming voltage transmitted from the external dimming input interface or the external dimming voltage connected. Specifically, when the voltage divider module 12 divides the input signal according to the switching operation of the mode switching module 13 and generates internal dimming voltages of different levels, a corresponding dimming signal can be generated. The active dimming signal includes multiple dimming signals corresponding to different levels of internal dimming voltage, enabling individual adjustment of the brightness of a single lamp. By connecting an external dimming voltage through the external dimming input interface, a corresponding external dimming signal can be generated, thus entering the passive dimming signal stage, enabling a unified change of brightness using the dimming bus.

[0039] Optionally, in this embodiment of the present invention, the output module 15 includes: a voltage follower circuit 151, a protection circuit 152, and an output circuit 153; the input terminal of the voltage follower circuit 151 is connected to an external dimming input interface, the output terminal of the voltage follower circuit 151 is connected to the input terminal of the protection circuit 152, the output terminal of the protection circuit 152 is connected to the input terminal of the output circuit 153, and the input terminal of the output circuit 153 is also connected to the mode switching module 13.

[0040] Optionally, in this embodiment of the present invention, the mode switching module 13 includes a mode switching switch. This mode switching switch includes a first switching port, a second switching port, a third switching port, a fourth switching port, a fifth switching port, a sixth switching port, a seventh switching port, an eighth switching port, and a connection to a master node. The first, second, third, fourth, and fifth switching ports are respectively connected to the voltage divider module 12, the sixth switching port is connected to the input terminal of the output circuit 153, and the first and eighth switching ports are left floating, connecting to the master node and an external dimming interface.

[0041] Optionally, in this embodiment of the present invention, the voltage divider module 12 includes: a first voltage divider circuit, a second voltage divider circuit, a third voltage divider circuit, a fourth voltage divider circuit, and a current limiting circuit.

[0042] The input terminals of the first voltage divider circuit, the second voltage divider circuit, the third voltage divider circuit, the fourth voltage divider circuit, and the current limiting circuit are all connected to the output terminal of the voltage regulator module 11. The output terminal of the current limiting circuit is connected to the fifth switching port, the output terminal of the first voltage divider circuit is connected to the fourth switching port, the output terminal of the second voltage divider circuit is connected to the third switching port, the output terminal of the third voltage divider circuit is connected to the second switching port, and the output terminal of the fourth voltage divider circuit is connected to the first switching port.

[0043] The principle of the dimming control circuit of the LED driver power supply of this utility model will be explained below with a specific embodiment.

[0044] refer to Figure 2 , Figure 2 A circuit diagram of a preferred embodiment of the dimming control circuit for the LED driver power supply provided by this utility model.

[0045] Specifically, such as Figure 2 As shown, in this embodiment, the voltage regulator module 11 includes: a first capacitor C600, a second capacitor C602, a third capacitor C603, an input resistor R600, a second resistor R602, a third resistor R603, a ninth resistor R609, a tenth resistor R610, a transistor Q600, and a reference resistor U600.

[0046] The emitter of transistor Q600 is connected to the power supply signal (AUX+, where AUX+ is the power signal provided by the auxiliary source of the drive power supply) through input resistor R600. The base of transistor Q600 is connected to the first terminal of reference U600, and the third terminal of reference U600 is grounded. The first terminal of the second resistor R602 and the first terminal of the second capacitor C602 are connected to the power supply signal. The second terminal of the second resistor R602 is connected to the base of transistor Q600, and the second terminal of the second capacitor C602 is grounded. Capacitor C600 and third resistor R603 are connected in series between the base and emitter of transistor Q600. The first terminal of ninth resistor R609 is connected to the second terminal of reference U600, and the second terminal of ninth resistor R609 is grounded. The first terminal of tenth resistor R610 is connected to the first terminals of third resistor R603 and ninth resistor R609, and the second terminal of tenth resistor R610 is grounded. The first terminal of third capacitor C603 is connected to the emitter of transistor Q600, and the second terminal of third capacitor C603 is grounded. The first terminal of second capacitor C602 is the input terminal of voltage regulator module 11, and the first terminal of third capacitor C603 is the output terminal of voltage regulator module 11.

[0047] In this embodiment, the first voltage divider circuit includes: a fourth resistor R604 and an eleventh resistor R611; the second voltage divider circuit includes: a fifth resistor R605 and a thirteenth resistor R613; the third voltage divider circuit includes: a sixth resistor R606 and a fifteenth resistor R615; the fourth voltage divider circuit includes: a seventh resistor R607 and an eighteenth resistor R618; and the current limiting circuit includes: an eighth resistor R608.

[0048] The first terminals of the fourth resistor R604, the fifth resistor R605, the sixth resistor R606, the seventh resistor R607, and the eighth resistor R608 are all connected to the output terminal of the voltage regulator module 11 (i.e., the first terminal of the third capacitor C603). The second terminal of the fourth resistor R604 is connected to the first terminal of the eleventh resistor R611 and the fourth switching port, and the second terminal of the eleventh resistor R611 is grounded. The second terminal of the fifth resistor R605 is connected to the first terminal of the thirteenth resistor R613 and the third switching port, and the thirteenth resistor R613 is grounded. The second terminal of the sixth resistor R606 is connected to the second switching port and the first terminal of the fifteenth resistor R615, and the second terminal of the fifteenth resistor R615 is grounded. The second terminal of the seventh resistor R607 is connected to the first switching port and the eighteenth resistor R618, and the eighteenth resistor R618 is grounded. The second terminal of the eighth resistor R608 is connected to the fifth switching port.

[0049] In this embodiment, the current limiting module 14 includes: a first resistor R601; the first end of the first resistor R601 is connected to the output end of the voltage regulator module 11, and the second end of the first resistor R601 is connected to the external dimming input interface and the main node.

[0050] Figure 2 In the diagram, SW600 is the mode switching switch, point A is the main connection node, "1" represents the first switching port, "2" represents the second switching port, "3" represents the third switching port, "4" represents the fourth switching port, "5" represents the fifth switching port, "6" represents the sixth switching port, "7" represents the seventh switching port, and "8" represents the eighth switching port.

[0051] In this embodiment, such as Figure 2 As shown, the voltage follower circuit 151 includes: a nineteenth resistor R619, a twentieth resistor R620, a fourth capacitor C604, a fifth capacitor C605, and a voltage follower U601.

[0052] The first end of the nineteenth resistor R619 is connected to the power supply signal, and the second end of the nineteenth resistor R619 is connected to the first end of the fourth capacitor C604 and the power supply terminal of the voltage follower U601. The fourth capacitor C604 is grounded. The first end of the twentieth resistor R620 is connected to the external dimming input interface, and the second end of the twentieth resistor R620 is connected to the fifth capacitor C605 and the positive input terminal of the voltage follower U601. The second end of the fifth capacitor C605 is grounded. The negative input terminal of the voltage follower U601 is connected to its output terminal, and the output terminal of the voltage follower U601 is connected to the input terminal of the protection circuit 152.

[0053] In this embodiment, such as Figure 2 As shown, the protection circuit 152 includes a diode D600 and a Zener diode D601; the output circuit 153 includes a 21st resistor R621 and a fuse F600.

[0054] The anode of diode D600 is connected to the output of voltage follower U601, and the cathode of diode D600 is connected to the cathode of Zener diode D601 and the input of fuse F600. The anode of Zener diode D601 is grounded. The input of fuse F600 is also connected to mode switching module 13, and the output of fuse F600 is connected to dimming circuitry. The input of the twenty-first resistor R621 is connected to the input of fuse F600, and the output of the twenty-first resistor R621 is grounded. The input of fuse F600 is also the input of protection circuit 152.

[0055] like Figure 2 As shown, the dimming mode is changed via a mode switch. When the mode switch is adjusted to any of the levels "1" to "5", the circuit is in active dimming mode. Figure 2 As shown, the 10V level signal is divided by the voltage divider module 12 to obtain a level signal of a corresponding level, thereby obtaining different internal dimming voltages.

[0056] like Figure 2As shown, when the mode switch is set to position "5", the 10V voltage is divided by the eighth resistor R608, resulting in an internal dimming voltage of 10V. When the mode switch is set to position "4", the 10V voltage is divided by the fourth resistor R604 and the eleventh resistor R611 to obtain an internal dimming voltage of 8V. When the mode switch is set to position "3", the 10V voltage is divided by the fifth resistor R605 and the thirteenth resistor R613 to obtain an internal dimming voltage of 6V. When the mode switch is set to position "2", the 10V voltage is divided by the sixth resistor R606 and the thirteenth resistor R613 to obtain an internal dimming voltage of 5V. When the mode switch is set to position "1", the 10V voltage is divided by the seventh resistor R607 and the eighteenth resistor R618 to obtain an internal dimming voltage of 4V. When the mode switch is set to the "6" OFF / EXT position, the external dimming voltage is input from the external dimming input interface (DIM+), and then directly transmitted to the input terminal of fuse F600 through the connection master node (point A) of the mode switch. Fuse F600 then transmits the external dimming signal to the dimming circuit. When the mode switch is set to dimming positions "1" to "5", the resulting internal dimming voltage is transmitted from the corresponding switching port to the connection master node, then through DIM+ to the input terminal of the twentieth resistor R620. From the twentieth resistor R620, the voltage is transmitted to the positive input terminal of voltage follower U601, and finally from the output terminal of voltage follower U601 through diode D600 to the input terminal of fuse F600.

[0057] The diode D600 can be configured as a dual-diode or single-diode structure. Both the diode D600 and the Zener diode D601 provide protection.

[0058] This utility model also provides an LED driver power supply, including: the dimming control circuit of the LED driver power supply disclosed in the embodiments of this utility model.

[0059] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They do not limit the scope of protection of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the scope of the claims of this utility model.

Claims

1. A dimming control circuit for an LED driver power supply, characterized in that, include: Voltage regulator module, voltage divider module, mode switching module, current limiting module, external dimming input interface and output module; The input terminal of the voltage regulator module is connected to the power supply signal, and the output terminal of the voltage regulator module is connected to the voltage divider module and the current limiting module. The mode switching module is connected to the voltage divider module, the external dimming input interface and the output module respectively. The external dimming input interface is connected to the current limiting module and the output module respectively. The voltage regulator module is used to regulate the voltage of the power supply signal to obtain the input signal; The mode switching module is used to switch modes according to the switching signal; The voltage divider module is used to divide the input signal according to the switching operation of the mode switching module to generate internal dimming voltages of different levels; the current limiting module is connected in parallel with the voltage divider module; The output module is used to output an active dimming signal or a passive dimming signal based on the internal dimming voltage transmitted through the external dimming input interface or the external dimming voltage received.

2. The dimming control circuit for the LED driver power supply according to claim 1, characterized in that, The output module includes: a voltage follower circuit, a protection circuit, and an output circuit; The input terminal of the voltage follower circuit is connected to the external dimming input interface, the output terminal of the voltage follower circuit is connected to the input terminal of the protection circuit, the output terminal of the protection circuit is connected to the input terminal of the output circuit, and the input terminal of the output circuit is also connected to the mode switching module.

3. The dimming control circuit for the LED driver power supply according to claim 2, characterized in that, The mode switching module includes: a mode switching switch; The mode switching switch includes: a first switching port, a second switching port, a third switching port, a fourth switching port, a fifth switching port, a sixth switching port, a seventh switching port, an eighth switching port, and a connection to the master node; The first switching port, the second switching port, the third switching port, the fourth switching port and the fifth switching port are respectively connected to the voltage divider module, the sixth switching port is connected to the input terminal of the output circuit, the first switching port and the eighth switching port are left floating, and the main connection node is connected to the external dimming input interface.

4. The dimming control circuit for the LED driver power supply according to claim 3, characterized in that, The voltage divider module includes: a first voltage divider circuit, a second voltage divider circuit, a third voltage divider circuit, a fourth voltage divider circuit, and a current limiting circuit; The input terminals of the first voltage divider circuit, the second voltage divider circuit, the third voltage divider circuit, the fourth voltage divider circuit, and the current limiting circuit are all connected to the output terminal of the voltage regulator module. The output of the current limiting circuit is connected to the fifth switching port, the output of the first voltage divider circuit is connected to the fourth switching port, the output of the second voltage divider circuit is connected to the third switching port, the output of the third voltage divider circuit is connected to the second switching port, and the output of the fourth voltage divider circuit is connected to the first switching port.

5. The dimming control circuit for the LED driver power supply according to claim 4, characterized in that, The voltage regulator module includes: a first capacitor, a second capacitor, a third capacitor, an input resistor, a second resistor, a third resistor, a ninth resistor, a tenth resistor, a transistor, and a reference. The emitter of the transistor is connected to the power supply signal through the input resistor. The base of the transistor is connected to the first terminal of the reference. The third terminal of the reference is grounded. The first terminal of the second resistor and the first terminal of the second capacitor are connected to the power supply signal. The second terminal of the second resistor is connected to the base of the transistor. The second terminal of the second capacitor is grounded. The first capacitor and the third resistor are connected in series between the base and emitter of the transistor. The first terminal of the ninth resistor is connected to the second terminal of the reference. The second terminal of the ninth resistor is grounded. The first terminal of the tenth resistor is connected to the first terminals of the third resistor and the ninth resistor. The second terminal of the tenth resistor is grounded. The first terminal of the third capacitor is connected to the emitter of the transistor. The second terminal of the third capacitor is grounded. The first terminal of the second capacitor is the input terminal of the voltage regulator module, and the first terminal of the third capacitor is the output terminal of the voltage regulator module.

6. The dimming control circuit for the LED driver power supply according to claim 4, characterized in that, The first voltage divider circuit includes a fourth resistor and an eleventh resistor; the second voltage divider circuit includes a fifth resistor and a thirteenth resistor; the third voltage divider circuit includes a sixth resistor and a fifteenth resistor; the fourth voltage divider circuit includes a seventh resistor and an eighteenth resistor; and the current limiting circuit includes an eighth resistor. The first ends of the fourth, fifth, sixth, seventh, and eighth resistors are all connected to the output terminal of the voltage regulator module. The second end of the fourth resistor is connected to the first end of the eleventh resistor and the fourth switching port, and the second end of the eleventh resistor is grounded. The second end of the fifth resistor is connected to the first end of the thirteenth resistor and the third switching port, and the thirteenth resistor is grounded. The second end of the sixth resistor is connected to the second switching port and the first end of the fifteenth resistor, and the second end of the fifteenth resistor is grounded. The second end of the seventh resistor is connected to the first switching port and the eighteenth resistor, and the eighteenth resistor is grounded. The second end of the eighth resistor is connected to the fifth switching port.

7. The dimming control circuit for the LED driver power supply according to claim 3, characterized in that, The current limiting module includes: a first resistor; The first end of the first resistor is connected to the output end of the voltage regulator module, and the second end of the first resistor is connected to the external dimming input interface and the connection master node.

8. The dimming control circuit for the LED driver power supply according to claim 2, characterized in that, The voltage follower circuit includes: a nineteenth resistor, a twentieth resistor, a fourth capacitor, a fifth capacitor, and a voltage follower; The first end of the nineteenth resistor is connected to the power supply signal, and the second end of the nineteenth resistor is connected to the first end of the fourth capacitor and the power supply terminal of the voltage follower. The fourth capacitor is grounded. The first end of the twentieth resistor is connected to the external dimming input interface, and the second end of the twentieth resistor is connected to the fifth capacitor and the positive input terminal of the voltage follower. The second end of the fifth capacitor is grounded. The negative input terminal of the voltage follower is connected to its output terminal, and the output terminal of the voltage follower is connected to the input terminal of the protection circuit.

9. The dimming control circuit for the LED driver power supply according to claim 8, characterized in that, The protection circuit includes a diode and a Zener diode; the output circuit includes a 21st resistor and a fuse. The anode of the diode is connected to the output terminal of the voltage follower, the cathode of the diode is connected to the cathode of the Zener diode and the input terminal of the fuse, and the anode of the Zener diode is grounded; the input terminal of the fuse is also connected to the mode switching module, the output terminal of the fuse is connected to the dimming circuit, the input terminal of the 21st resistor is connected to the input terminal of the fuse, and the output terminal of the 21st resistor is grounded.

10. An LED driver power supply, characterized in that, include: The dimming control circuit of the LED driver power supply according to any one of claims 1-9.

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