Multi-channel LED dimming centralized independent control device

Abstract

The application relates to a multi-channel LED dimming centralized independent control device, which comprises an LED1, an LED2, a centralized independent control module and the like; a dimming input voltage Vin is connected with the anode of the LED1 and the LED2, the first end of capacitors C1-C2 and the cathode of voltage stabilizing tubes D1-D2; the second end of the capacitor C1 is connected with the cathode of the LED1 and the first end of an inductor L1, the second end of the inductor L1 is connected with the anode of the voltage stabilizing tube D1 and the first pole of a switch tube SW1, the second pole of the switch tube SW1 is connected with the first end of a resistor R1 and the first input end of the centralized independent control module, and the control pole of the switch tube SW1 is connected with the first output end of the centralized independent control module; the centralized independent control module can realize centralized dimming control for the LED1 and the LED2.

Description

Technical Field

[0001] This invention relates to the field of LED dimming control technology, and in particular to a centralized independent control device for multi-channel LED dimming. Background Technology

[0002] High-power LEDs, with their long lifespan, high luminous efficacy, and environmental friendliness, have become a new generation of green light sources. With economic development and scientific progress, LED lighting has become very widespread. Because LED lamps require strict control of their operating voltage and current to meet their operational characteristics and demands for reliability and efficiency, they generally require dedicated driver power supplies. Furthermore, users have varying needs regarding the illuminance of the light source at different times. Currently, the commonly used PWM dimming method for LEDs cannot adequately address the needs of multi-channel dimming. Therefore, developing comprehensive and highly stable dimming capabilities tailored to the specific needs of different LED channels is an important direction for improving the LED user experience. Summary of the Invention

[0003] This invention discloses a centralized independent control device for multi-channel LED dimming, comprising: LED1, LED2, switching transistors SW1 and SW2, resistors R1-R2, capacitors C1-C2, inductors L1-L2, Zener diodes D1-D2, and a centralized independent control module; the dimming input voltage Vin is connected to the anodes of LED1 and LED2, the first terminal of capacitors C1-C2, and the cathode of Zener diodes D1-D2; the second terminal of capacitor C1 is connected to the cathode of LED1 and the first terminal of inductor L1, the second terminal of inductor L1 is connected to the anode of Zener diode D1 and the first terminal of switching transistor SW1, and the second terminal of switching transistor SW1 is connected to the resistors R1-R2, C1-C2, L1-L2, D1-D2, and D1-D2. The first terminal of R1 is connected to the first input terminal of the centralized independent control module, and the control electrode of the switching transistor SW1 is connected to the first output terminal of the centralized independent control module; the second terminal of capacitor C2 is connected to the cathode of LED2 and the first terminal of inductor L2, the second terminal of inductor L2 is connected to the anode of Zener diode D2 and the first electrode of switching transistor SW2, the second electrode of switching transistor SW2 is connected to the first terminal of resistor R2 and the second input terminal of the centralized independent control module, and the control electrode of switching transistor SW2 is connected to the second output terminal of the centralized independent control module. The centralized independent control module can centrally control the dimming of LED1 and LED2.

[0004] The multi-channel LED dimming centralized independent control device includes a centralized independent control module comprising: a centralized control module, a first controller, a second controller, a first filter, a second filter, switching transistors SW3-SW4, and logic units U1-U8. The first controller and the second controller are both connected to the centralized control module and receive control signals from the centralized control module to perform dimming control on different channels of LEDs respectively.

[0005] The multi-channel LED dimming centralized independent control device comprises the following: the negative input terminal of logic U1 is connected to the first reference voltage Vref1, the positive input terminal is connected to the output terminal of the first filter, the output terminal of logic U1 is connected to the first terminal of resistor R3 and the input terminal of the first controller, the output terminal of the first controller is connected to the S terminal of logic U3, the positive input terminal of logic U2 is connected to the first terminal of switch SW3 and the first input terminal P1 of the centralized independent control module, the negative input terminal of logic U2 is connected to the first peak voltage Vpeak1, the output terminal of logic U2 is connected to the R terminal of logic U3, the D terminal of logic U3 is connected to the control terminal of switch SW3 and the input terminal of logic U4, the output terminal of logic U4 is connected to the first output terminal P2 of the centralized independent control module, and the input terminal of the first filter is connected to the second terminal of switch SW3.

[0006] The negative input terminal of logic U2 is connected to the second reference voltage Vref2, and the positive input terminal is connected to the output terminal of the second filter. The output terminal of logic U2 is connected to the first terminal of resistor R4 and the input terminal of the second controller. The output terminal of the second controller is connected to the S terminal of logic U7. The positive input terminal of logic U6 is connected to the first terminal of switch SW4 and the second input terminal P3 of the centralized independent control module. The negative input terminal of logic U6 is connected to the second peak voltage Vpeak2. The output terminal of logic U6 is connected to the R terminal of logic U7. The D terminal of logic U7 is connected to the control terminal of switch SW4 and the input terminal of logic U8. The output terminal of logic U8 is connected to the second output terminal P4 of the centralized independent control module. The input terminal of the second filter is connected to the second terminal of switch SW4.

[0007] The aforementioned multi-channel LED dimming centralized independent control device comprises: logic unit U1 being an OTA circuit; logic unit U2 being a comparator circuit; logic unit U3 being an RS trigger circuit; logic unit U4 being a buffer; logic unit U5 being an OTA circuit; logic unit U6 being a comparator circuit; logic unit U7 being an RS trigger circuit; and logic unit U8 being a buffer.

[0008] The multi-channel LED dimming centralized independent control device has the same circuit structure for the first controller and the second controller.

[0009] The aforementioned multi-channel LED dimming centralized independent control device includes, for both the first controller and the second controller, switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19. It receives the output signal of logic unit U1 through the VF port, outputs a signal to logic unit U3 through the VS port, and receives the control signal from the centralized control module through the Q port.

[0010] The multi-channel LED dimming centralized independent control device has the VF port connected to the first end of resistor R5. The second end of resistor R5 is connected to the positive input of comparator CMP1, the first end of resistor R6, the control terminal of switch M1, and the first input of logic circuit U11. The output of comparator CMP1 is connected to the control terminals of switch M2 and M6, the output of logic circuit U9, the input of logic circuit U10, and the control terminal of logic circuit U11. The first end of current source IB1 is connected to power supply VDD, and the second end of current source IB1 is connected to logic circuit U11. The second input terminal of the circuit is connected to the first terminal of the switching transistor M1, the second terminal of the switching transistor M1 is grounded, and the output terminal of the logic circuit U11 is connected to the negative input terminal of the comparator CMP2. The first terminal of the current source IB2 is connected to the power supply VDD, the second terminal of the current source IB2 is connected to the first terminal of the switching transistor M2, the second terminal of the switching transistor M2 is connected to the first terminals of the switching transistors M4 and M3, the second terminal of the switching transistor M4 is connected to the first terminal of the switching transistor M5, the positive input terminal of the comparator CMP2, and the first terminal of the capacitor C7, and the control terminal of the switching transistors M4-M5 is connected to the output terminal of the logic circuit U17. The first terminal of circuit 3 is connected to power supply VDD, and the second terminal is connected to the first terminal of switching transistor M3. The control terminal of switching transistor M3 is connected to the output terminal of logic circuit U9. The first terminal of current sources IB4-IB5 is connected to power supply VDD. The second terminal of current source IB4 is connected to the first terminal of switching transistor M6, and the second terminal of current source IB5 is connected to the first terminal of switching transistor M7. The second terminal of switching transistor M6 is connected to the second terminal of switching transistor M7 and the first terminal of switching transistor M8. The control terminal of switching transistor M7 is connected to the output terminal of logic circuit U10. The output terminal of comparator CMP2 is connected to the S terminal of logic circuit U18. Logic circuit U18... The first output terminal is connected to the control terminal of switching transistors M8-M9. The second terminal of switching transistor M8 and the first terminal of switching transistor M9 are connected to the first terminal of capacitor C8 and the input terminal of logic circuit U12. The output terminal of logic circuit U12 is connected to the input terminal of logic circuit U13. The output terminal of logic circuit U13 is connected to the input terminal of logic circuit U19 and the first input terminal of logic circuit U14. The output terminal of logic circuit U19 is connected to the first terminal of resistor R9. The second terminal of resistor R9 is connected to the first terminal of capacitor C6 and the second input terminal of logic circuit U14. The output terminal of logic circuit U14 is connected to the VS port.

[0011] The aforementioned multi-channel LED dimming centralized independent control device has the Q port connected to the centralized control module. The output of the Q port is connected to the input of logic circuit U15 and the second input of logic circuit U16. The output of logic circuit U15 is connected to the first end of resistor R7. The second end of resistor R7 is connected to the first end of capacitor C5 and the first input of logic circuit U16. The second end of capacitor C5 is grounded. The output of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output of logic circuit U18 is connected to the second input of logic circuit U17 and the first end of resistor R8. The second end of resistor R8 is connected to the first end of capacitor C9 and the first input of logic circuit U17. The output of logic circuit U17 is connected to the control terminals of switching transistors M4-M5. The second end of capacitor C9 is grounded. Logic circuit U11 is a multiplexer.

[0012] The multi-channel LED dimming centralized independent control device uses a time-division multiplexing structure for the circuits of the first controller and the second controller. The centralized control module sends time-division multiplexing control signals to control the first controller and the second controller to output dimming control signals in a time-division manner.

[0013] The multi-channel LED dimming centralized independent control device includes a first controller comprising: switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19; it receives the output signal of logic U1 through the VF port, outputs a signal to logic U3 through the VS port, and receives the control signal from the centralized control module through the Q1 and Q2 ports in a time-division manner for dimming control, that is, the Q1 and Q2 ports receive the control signal from the centralized control module at time intervals according to the dimming requirements of LED1 and LED2, and perform time-division dimming;

[0014] The Q1 port is connected to the first output terminal of the centralized control module, and the Q2 port is connected to the second output terminal of the centralized control module. The Q1 port corresponds to the dimming control of LED1, and the Q2 port corresponds to the dimming control of LED2. The output terminal of the Q1 port is connected to the input terminal of logic circuit U15 and the second input terminal of logic circuit U16. The output terminal of logic circuit U15 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the first terminal of capacitor C5 and the first input terminal of logic circuit U16. The second terminal of capacitor C5 is grounded. The output terminal of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output terminal of logic circuit U18 is connected to the second input terminal of logic circuit U17 and the first terminal of resistor R8. The second terminal of resistor R8 is connected to the first terminal of capacitor C9 and the first input terminal of logic circuit U17. The output terminal of logic circuit U17 is connected to the control terminal of switching transistors M4-M5. The second terminal of capacitor C9 is grounded. The circuit connected to the output terminal of the Q2 port is the same as that of the Q1 port.

[0015] This invention proposes a centralized independent control device for multi-channel LED dimming. Through a centralized control module, a first control module, and a second control module, it controls the dimming of multiple LEDs, achieving better LED dimming. This invention also enables time-sharing control of the control module by the centralized control module, allowing a single control module to be used for multiplexing control. One improvement of this invention is the use of a centralized independent control module, comprising a fully functional first control module and a second control module, accurately receiving output signals from LEDs, filtering the output signals, and achieving accurate dimming control, thus improving dimming precision and enabling centralized control of multiple channels. The controllable switch S1 receives the control logic from the centralized control module. When there is an input signal at the Q2 port, it controls the controllable switch S1 to conduct. When the controllable switch S1 is conducting, it generates a control signal indicating that LED 1 is in a non-dimming period to facilitate time-sharing multiplexing dimming identification and control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a multi-channel LED dimming centralized independent control device according to the present invention.

[0017] Figure 2 This is a schematic diagram of the centralized independent control module of the present invention.

[0018] Figure 3 This is a schematic diagram of a first embodiment of the first controller or the second controller of the present invention.

[0019] Figure 4 This is a schematic diagram of a second embodiment of the first controller or the second controller of the present invention. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1:

[0022] like Figure 1 The diagram shown is a schematic of a multi-channel LED dimming centralized independent control device according to the present invention.

[0023] This invention discloses a centralized independent control device for multi-channel LED dimming, comprising: LED1, LED2, switching transistors SW1 and SW2, resistors R1-R2, capacitors C1-C2, inductors L1-L2, Zener diodes D1-D2, and a centralized independent control module; the dimming input voltage Vin is connected to the anodes of LED1 and LED2, the first terminal of capacitors C1-C2, and the cathode of Zener diodes D1-D2; the second terminal of capacitor C1 is connected to the cathode of LED1 and the first terminal of inductor L1, the second terminal of inductor L1 is connected to the anode of Zener diode D1 and the first terminal of switching transistor SW1, and the second terminal of switching transistor SW1 is connected to the resistors R1-R2, C1-C2, L1-L2, D1-D2, and D1-D2. The first terminal of R1 is connected to the first input terminal of the centralized independent control module, and the control electrode of the switching transistor SW1 is connected to the first output terminal of the centralized independent control module; the second terminal of capacitor C2 is connected to the cathode of LED2 and the first terminal of inductor L2, the second terminal of inductor L2 is connected to the anode of Zener diode D2 and the first electrode of switching transistor SW2, the second electrode of switching transistor SW2 is connected to the first terminal of resistor R2 and the second input terminal of the centralized independent control module, and the control electrode of switching transistor SW2 is connected to the second output terminal of the centralized independent control module. The centralized independent control module can centrally control the dimming of LED1 and LED2.

[0024] like Figure 2 The diagram shown is a schematic of the centralized independent control module of this invention.

[0025] The multi-channel LED dimming centralized independent control device includes a centralized independent control module comprising: a centralized control module, a first controller, a second controller, a first filter, a second filter, switching transistors SW3-SW4, and logic units U1-U8. The first controller and the second controller are both connected to the centralized control module and receive control signals from the centralized control module to perform dimming control on different channels of LEDs respectively.

[0026] The multi-channel LED dimming centralized independent control device comprises the following: the negative input terminal of logic U1 is connected to the first reference voltage Vref1, the positive input terminal is connected to the output terminal of the first filter, the output terminal of logic U1 is connected to the first terminal of resistor R3 and the input terminal of the first controller, the output terminal of the first controller is connected to the S terminal of logic U3, the positive input terminal of logic U2 is connected to the second terminal of switch SW3 and the first input terminal P1 of the centralized independent control module, the negative input terminal of logic U2 is connected to the first peak voltage Vpeak1, the output terminal of logic U2 is connected to the R terminal of logic U3, the D terminal of logic U3 is connected to the control terminal of switch SW3 and the input terminal of logic U4, the output terminal of logic U4 is connected to the first output terminal P2 of the centralized independent control module, and the input terminal of the first filter is connected to the second terminal of switch SW3.

[0027] The negative input terminal of logic U2 is connected to the second reference voltage Vref2, and the positive input terminal is connected to the output terminal of the second filter. The output terminal of logic U2 is connected to the first terminal of resistor R4 and the input terminal of the second controller. The output terminal of the second controller is connected to the S terminal of logic U7. The positive input terminal of logic U6 is connected to the second terminal of switch SW4 and the second input terminal P3 of the centralized independent control module. The negative input terminal of logic U6 is connected to the second peak voltage Vpeak2. The output terminal of logic U6 is connected to the R terminal of logic U7. The D terminal of logic U7 is connected to the control terminal of switch SW4 and the input terminal of logic U8. The output terminal of logic U8 is connected to the second output terminal P4 of the centralized independent control module. The input terminal of the second filter is connected to the second terminal of switch SW4.

[0028] The aforementioned multi-channel LED dimming centralized independent control device comprises: logic unit U1 being an OTA circuit; logic unit U2 being a comparator circuit; logic unit U3 being an RS trigger circuit; logic unit U4 being a buffer; logic unit U5 being an OTA circuit; logic unit U6 being a comparator circuit; logic unit U7 being an RS trigger circuit; and logic unit U8 being a buffer.

[0029] like Figure 3 The diagram shown is a schematic diagram of a first embodiment of the first controller or the second controller of the present invention.

[0030] The multi-channel LED dimming centralized independent control device has the same circuit structure for the first controller and the second controller.

[0031] The aforementioned multi-channel LED dimming centralized independent control device includes, for both the first controller and the second controller, switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19. It receives the output signal of logic unit U1 through the VF port, outputs a signal to logic unit U3 through the VS port, and receives the control signal from the centralized control module through the Q port.

[0032] The multi-channel LED dimming centralized independent control device has the VF port connected to the first end of resistor R5. The second end of resistor R5 is connected to the positive input of comparator CMP1, the first end of resistor R6, the control terminal of switch M1, and the first input of logic circuit U11. The output of comparator CMP1 is connected to the control terminals of switch M2 and M6, the output of logic circuit U9, the input of logic circuit U10, and the control terminal of logic circuit U11. The first end of current source IB1 is connected to power supply VDD, and the second end of current source IB1 is connected to logic circuit U11. The second input terminal of the circuit is connected to the first terminal of the switching transistor M1, the second terminal of the switching transistor M1 is grounded, and the output terminal of the logic circuit U11 is connected to the negative input terminal of the comparator CMP2. The first terminal of the current source IB2 is connected to the power supply VDD, the second terminal of the current source IB2 is connected to the first terminal of the switching transistor M2, the second terminal of the switching transistor M2 is connected to the first terminals of the switching transistors M4 and M3, the second terminal of the switching transistor M4 is connected to the first terminal of the switching transistor M5, the positive input terminal of the comparator CMP2, and the first terminal of the capacitor C7, and the control terminal of the switching transistors M4-M5 is connected to the output terminal of the logic circuit U17. The first terminal of circuit 3 is connected to power supply VDD, and the second terminal is connected to the first terminal of switching transistor M3. The control terminal of switching transistor M3 is connected to the output terminal of logic circuit U9. The first terminal of current sources IB4-IB5 is connected to power supply VDD. The second terminal of current source IB4 is connected to the first terminal of switching transistor M6, and the second terminal of current source IB5 is connected to the first terminal of switching transistor M7. The second terminal of switching transistor M6 is connected to the second terminal of switching transistor M7 and the first terminal of switching transistor M8. The control terminal of switching transistor M7 is connected to the output terminal of logic circuit U10. The output terminal of comparator CMP2 is connected to the S terminal of logic circuit U18. Logic circuit U18... The first output terminal is connected to the control terminal of switching transistors M8-M9. The second terminal of switching transistor M8 and the first terminal of switching transistor M9 are connected to the first terminal of capacitor C8 and the input terminal of logic circuit U12. The output terminal of logic circuit U12 is connected to the input terminal of logic circuit U13. The output terminal of logic circuit U13 is connected to the input terminal of logic circuit U19 and the first input terminal of logic circuit U14. The output terminal of logic circuit U19 is connected to the first terminal of resistor R9. The second terminal of resistor R9 is connected to the first terminal of capacitor C6 and the second input terminal of logic circuit U14. The output terminal of logic circuit U14 is connected to the VS port.

[0033] The aforementioned multi-channel LED dimming centralized independent control device has the Q port connected to the centralized control module. The output of the Q port is connected to the input of logic circuit U15 and the second input of logic circuit U16. The output of logic circuit U15 is connected to the first end of resistor R7. The second end of resistor R7 is connected to the first end of capacitor C5 and the first input of logic circuit U16. The second end of capacitor C5 is grounded. The output of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output of logic circuit U18 is connected to the second input of logic circuit U17 and the first end of resistor R8. The second end of resistor R8 is connected to the first end of capacitor C9 and the first input of logic circuit U17. The output of logic circuit U17 is connected to the control terminals of switching transistors M4-M5. The second end of capacitor C9 is grounded. Logic circuit U11 is a multiplexer.

[0034] Example 2:

[0035] like Figure 4 The diagram shown is a schematic of a second embodiment of the first or second controller of the present invention. In the multi-channel LED dimming centralized independent control device, the circuits of the first and second controllers adopt a time-division multiplexing structure. The centralized control module sends time-division multiplexed control signals to control the first and second controllers to output dimming control signals in a time-division manner.

[0036] The multi-channel LED dimming centralized independent control device includes a first controller comprising: switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19; it receives the output signal of logic U1 through the VF port, outputs a signal to logic U3 through the VS port, and receives the control signal from the centralized control module through the Q1 and Q2 ports in a time-division manner for dimming control, that is, the Q1 and Q2 ports receive the control signal from the centralized control module at time intervals according to the dimming requirements of LED1 and LED2, and perform time-division dimming;

[0037] The Q1 port is connected to the first output terminal of the centralized control module, and the Q2 port is connected to the second output terminal of the centralized control module. The Q1 port corresponds to the dimming control of LED1, and the Q2 port corresponds to the dimming control of LED2. The output terminal of the Q1 port is connected to the input terminal of logic circuit U15 and the second input terminal of logic circuit U16. The output terminal of logic circuit U15 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the first terminal of capacitor C5 and the first input terminal of logic circuit U16. The second terminal of capacitor C5 is grounded. The output terminal of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output terminal of logic circuit U18 is connected to the second input terminal of logic circuit U17 and the first terminal of resistor R8. The second terminal of resistor R8 is connected to the first terminal of capacitor C9 and the first input terminal of logic circuit U17. The output terminal of logic circuit U17 is connected to the control terminal of switching transistors M4-M5. The second terminal of capacitor C9 is grounded. The circuit connected to the output terminal of the Q2 port is the same as that of the Q1 port.

[0038] The VF port is connected to the first end of resistor R5. The second end of resistor R5 is connected to the positive input terminal of comparator CMP1, the first end of resistor R6, the control terminal of switch M1, and the first input terminal of logic circuit U11. The output terminal of comparator CMP1 is connected to the control terminals of switch M2 and M6, the output terminal of logic circuit U9, the input terminal of logic circuit U10, and the control terminal of logic circuit U11. The first end of current source IB1 is connected to power supply VDD, and the second end of current source IB1 is connected to the second input terminal of logic circuit U11 and the first input terminal of switch M1. At one end, the second terminal of switching transistor M1 is grounded, and the output of logic circuit U11 is connected to the negative input of comparator CMP2; the first terminal of current source IB2 is connected to power supply VDD, the second terminal of current source IB2 is connected to the first terminal of switching transistor M2, the second terminal of switching transistor M2 is connected to the first terminals of switching transistor M4 and M3, the second terminal of switching transistor M4 is connected to the first terminal of switching transistor M5, the positive input of comparator CMP2, and the first terminal of capacitor C7, and the control terminals of switching transistors M4-M5 are connected to the output of logic circuit U17; the first terminal of current source IB3 is connected to power supply VDD. The first terminal of the current source IB4-IB5 is connected to the first terminal of the switching transistor M3. The control terminal of the switching transistor M3 is connected to the output terminal of the logic circuit U9. The first terminal of the current source IB4-IB5 is connected to the power supply VDD. The second terminal of the current source IB4 is connected to the first terminal of the switching transistor M6. The second terminal of the current source IB5 is connected to the first terminal of the switching transistor M7. The second terminal of the switching transistor M6 is connected to the second terminal of the switching transistor M7 and the first terminal of the switching transistor M8. The control terminal of the switching transistor M7 is connected to the output terminal of the logic circuit U10. The output terminal of the comparator CMP2 is connected to the S terminal of the logic circuit U18. The first output terminal of the logic circuit U18 is connected to the power supply VDD. The second terminal of the current source IB4 is connected to the first terminal of the switching transistor M6. The second terminal of the current source IB5 is connected to the first terminal of the switching transistor M7. The second terminal of the switching transistor M6 is connected to the second terminal of the switching transistor M7 and the first terminal of the switching transistor M8. The control terminal of the switching transistor M7 is connected to the output terminal of the logic circuit U10. The output terminal of the comparator CMP2 is connected to the S terminal of the logic circuit U18. The first terminal is connected to the control terminal of switching transistors M8-M9. The second terminal of switching transistor M8 and the first terminal of switching transistor M9 are connected to the first terminal of capacitor C8 and the input terminal of logic circuit U12. The output terminal of logic circuit U12 is connected to the input terminal of logic circuit U13. The output terminal of logic circuit U13 is connected to the input terminal of logic circuit U19 and the first input terminal of logic circuit U14. The output terminal of logic circuit U19 is connected to the first terminal of resistor R9. The second terminal of resistor R9 is connected to the first terminal of capacitor C6 and the second input terminal of logic circuit U14. The output terminal of logic circuit U14 is connected to the VS port.

[0039] The multi-channel LED dimming centralized independent control device has the following components: Q1 port is connected to the centralized control module; the output of Q1 port is connected to the input of logic circuit U15 and the second input of logic circuit U16; the output of logic circuit U15 is connected to the first end of resistor R7; the second end of resistor R7 is connected to the first end of capacitor C5 and the first input of logic circuit U16; the second end of capacitor C5 is grounded; the output of logic circuit U16 is connected to the R terminal of logic circuit U18; the second output of logic circuit U18 is connected to the second input of logic circuit U17 and the first end of resistor R8; the second end of resistor R8 is connected to the first end of capacitor C9 and the first input of logic circuit U17; the output of logic circuit U17 is connected to the control terminals of switching transistors M4-M5; the second end of capacitor C9 is grounded; and logic circuit U11 is a multiplexer.

[0040] The multi-channel LED dimming centralized independent control device has the following configuration: the Q2 port is connected to the centralized control module; the output of the Q2 port is connected to the input of logic circuit U20 and the second input of logic circuit U21; the output of logic circuit U20 is connected to the first end of resistor R10; the second end of resistor R10 is connected to the first end of capacitor C10 and the first end of controllable switch S1; the second end of controllable switch S1 is connected to the first input of logic circuit U21; the second end of capacitor C10 is grounded; and the output of logic circuit U21 is connected to the R end of logic circuit U18.

[0041] The controllable switch S1 receives the control logic of the centralized control module. When there is an input signal at the Q2 port, it controls the controllable switch S1 to be turned on. When the controllable switch S1 is turned on, it generates a control signal for LED1 to be in a non-dimming time period to facilitate time-division multiplexing dimming identification control.

[0042] This invention proposes a centralized independent control device for multi-channel LED dimming. Through a centralized control module, a first control module, and a second control module, it controls the dimming of multiple LEDs, achieving better LED dimming. This invention also enables time-sharing control of the control module by the centralized control module, allowing a single control module to be used for multiplexing control. One improvement of this invention is the use of a centralized independent control module, comprising a fully functional first control module and a second control module, accurately receiving output signals from LEDs, filtering the output signals, and achieving accurate dimming control, thus improving dimming precision and enabling centralized control of multiple channels. The controllable switch S1 receives the control logic from the centralized control module. When there is an input signal at the Q2 port, it controls the controllable switch S1 to conduct. When the controllable switch S1 is conducting, it generates a control signal indicating that LED 1 is in a non-dimming period to facilitate time-sharing multiplexing dimming identification and control.

Claims

1. A centralized independent control device for multi-channel LED dimming, characterized in that, include: LED1, LED2, switching transistors SW1 and SW2, resistors R1-R2, capacitors C1-C2, inductors L1-L2, Zener diodes D1-D2, and a centralized independent control module; the dimming input voltage Vin is connected to the anodes of LED1 and LED2, the first terminal of capacitors C1-C2, and the cathode of Zener diodes D1-D2; the second terminal of capacitor C1 is connected to the cathode of LED1 and the first terminal of inductor L1; the second terminal of inductor L1 is connected to the anode of Zener diode D1 and the first terminal of switching transistor SW1; the second terminal of switching transistor SW1 is connected to the first terminal of resistor R1 and the centralized independent control module. The first input terminal of the control module is connected to the control electrode of the switching transistor SW1, which is connected to the first output terminal of the centralized independent control module. The second terminal of the capacitor C2 is connected to the cathode of LED2 and the first terminal of the inductor L2. The second terminal of the inductor L2 is connected to the anode of the Zener diode D2 and the first electrode of the switching transistor SW2. The second electrode of the switching transistor SW2 is connected to the first terminal of the resistor R2 and the second input terminal of the centralized independent control module. The control electrode of the switching transistor SW2 is connected to the second output terminal of the centralized independent control module. The centralized independent control module can centrally control the dimming of LED1 and LED2. The centralized independent control module includes: a centralized control module, a first controller, a second controller, a first filter, a second filter, switching transistors SW3-SW4, and logic devices U1-U8. The first and second controllers are both connected to the centralized control module and receive control signals from the centralized control module to control the dimming of LEDs on different paths. The negative input terminal of logic device U1 is connected to a first reference voltage Vref1, and the positive input terminal is connected to the output terminal of the first filter. The output terminal of logic device U1 is connected to the first terminal of resistor R3 and the input terminal of the first controller. The output terminal of the first controller is connected to the S terminal of logic device U3. The positive input terminal of logic device U2 is connected to the first terminal of switching transistor SW3 and the first input terminal P1 of the centralized independent control module. The negative input terminal of logic device U2 is connected to a first peak voltage Vpeak1. The output terminal of logic device U2 is connected to the R terminal of logic device U3. The D terminal of logic device U3 is connected to the control terminal of switching transistor SW3 and the input terminal of logic device U4. The output terminal of logic device U4 is connected to the first output terminal P2 of the centralized independent control module. The input terminal of the first filter is connected to the second terminal of switching transistor SW3. The negative input terminal of logic U5 is connected to the second reference voltage Vref2, and the positive input terminal is connected to the output terminal of the second filter. The output terminal of logic U5 is connected to the first terminal of resistor R4 and the input terminal of the second controller. The output terminal of the second controller is connected to the S terminal of logic U7. The positive input terminal of logic U6 is connected to the first terminal of switch SW4 and the second input terminal P3 of the centralized independent control module. The negative input terminal of logic U6 is connected to the second peak voltage Vpeak2. The output terminal of logic U6 is connected to the R terminal of logic U7. The D terminal of logic U7 is connected to the control terminal of switch SW4 and the input terminal of logic U8. The output terminal of logic U8 is connected to the second output terminal P4 of the centralized independent control module. The input terminal of the second filter is connected to the second terminal of switch SW4.

2. The multi-channel LED dimming centralized independent control device as described in claim 1, characterized in that, The logic unit U1 is an OTA circuit, the logic unit U2 is a comparator circuit, the logic unit U3 is an RS trigger circuit, and the logic unit U4 is a buffer; the logic unit U5 is an OTA circuit, the logic unit U6 is a comparator circuit, the logic unit U7 is an RS trigger circuit, and the logic unit U8 is a buffer.

3. The multi-channel LED dimming centralized independent control device as described in claim 1, characterized in that, The first controller and the second controller have the same circuit structure.

4. The multi-channel LED dimming centralized independent control device as described in claim 3, characterized in that, Both the first controller and the second controller include: switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19; the controller receives the output signal of the logic device U1 through the VF port, outputs a signal to the logic device U3 through the VS port, and receives the control signal of the centralized control module through the Q port.

5. The multi-channel LED dimming centralized independent control device as described in claim 4, characterized in that, The VF port is connected to the first end of resistor R5. The second end of resistor R5 is connected to the positive input of comparator CMP1, the first end of resistor R6, the control terminal of switch M1, and the first input of logic circuit U11. The output of comparator CMP1 is connected to the control terminals of switch M2 and M6, the input terminals of logic circuit U9 and U10, and the control terminal of logic circuit U11. The first end of current source IB1 is connected to power supply VDD, and the second end of current source IB1 is connected to the second input terminal of logic circuit U11 and the first input terminal of switch M1. At one end, the second terminal of switching transistor M1 is grounded, and the output of logic circuit U11 is connected to the negative input of comparator CMP2; the first terminal of current source IB2 is connected to power supply VDD, the second terminal of current source IB2 is connected to the first terminal of switching transistor M2, the second terminal of switching transistor M2 is connected to the first terminals of switching transistor M4 and M3, the second terminal of switching transistor M4 is connected to the first terminal of switching transistor M5, the positive input of comparator CMP2, and the first terminal of capacitor C7, and the control terminals of switching transistors M4-M5 are connected to the output of logic circuit U17; the first terminal of current source IB3 is connected to power supply VDD. The first terminal of the current source IB4-IB5 is connected to the first terminal of the switching transistor M3. The control terminal of the switching transistor M3 is connected to the output terminal of the logic circuit U9. The first terminal of the current source IB4-IB5 is connected to the power supply VDD. The second terminal of the current source IB4 is connected to the first terminal of the switching transistor M6. The second terminal of the current source IB5 is connected to the first terminal of the switching transistor M7. The second terminal of the switching transistor M6 is connected to the second terminal of the switching transistor M7 and the first terminal of the switching transistor M8. The control terminal of the switching transistor M7 is connected to the output terminal of the logic circuit U10. The output terminal of the comparator CMP2 is connected to the S terminal of the logic circuit U18. The first output terminal of the logic circuit U18 is connected to the power supply VDD. The second terminal of the current source IB4 is connected to the first terminal of the switching transistor M6. The second terminal of the current source IB5 is connected to the first terminal of the switching transistor M7. The second terminal of the switching transistor M6 is connected to the second terminal of the switching transistor M7 and the first terminal of the switching transistor M8. The control terminal of the switching transistor M7 is connected to the output terminal of the logic circuit U10. The output terminal of the comparator CMP2 is connected to the S terminal of the logic circuit U18. The first terminal is connected to the control terminal of switching transistors M8-M9. The second terminal of switching transistor M8 and the first terminal of switching transistor M9 are connected to the first terminal of capacitor C8 and the input terminal of logic circuit U12. The output terminal of logic circuit U12 is connected to the input terminal of logic circuit U13. The output terminal of logic circuit U13 is connected to the input terminal of logic circuit U19 and the first input terminal of logic circuit U14. The output terminal of logic circuit U19 is connected to the first terminal of resistor R9. The second terminal of resistor R9 is connected to the first terminal of capacitor C6 and the second input terminal of logic circuit U14. The output terminal of logic circuit U14 is connected to the VS port.

6. The multi-channel LED dimming centralized independent control device as described in claim 5, characterized in that, The Q port is connected to the centralized control module. The output of the Q port is connected to the input of logic circuit U15 and the second input of logic circuit U16. The output of logic circuit U15 is connected to the first end of resistor R7. The second end of resistor R7 is connected to the first end of capacitor C5 and the first input of logic circuit U16. The second end of capacitor C5 is grounded. The output of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output of logic circuit U18 is connected to the second input of logic circuit U17 and the first end of resistor R8. The second end of resistor R8 is connected to the first end of capacitor C9 and the first input of logic circuit U17. The output of logic circuit U17 is connected to the control terminals of switching transistors M4-M5. The second end of capacitor C9 is grounded. Logic circuit U11 is a multiplexer.

7. The multi-channel LED dimming centralized independent control device as described in claim 1, characterized in that, The circuits of the first controller and the second controller adopt a time-division multiplexing structure. The time-division multiplexing control signal is sent through the centralized control module to control the first controller and the second controller to output dimming control signals in a time-division manner.

8. The multi-channel LED dimming centralized independent control device as described in claim 7, characterized in that, The first controller includes: switching transistors M1-M9, comparators CMP1-CMP2, current sources IB1-IB5, resistors R5-R9, capacitors C5-C9, and logic circuits U9-U19; it receives the output signal of logic U1 through the VF port, outputs a signal to logic U3 through the VS port, and receives the control signal of the centralized control module through the Q1 and Q2 ports in a time-division manner for dimming control, that is, the Q1 and Q2 ports receive the control signal of the centralized control module at time intervals according to the dimming requirements of LED1 and LED2, and perform time-division dimming. The Q1 port is connected to the first output terminal of the centralized control module, and the Q2 port is connected to the second output terminal of the centralized control module. The Q1 port corresponds to the dimming control of LED1, and the Q2 port corresponds to the dimming control of LED2. The output terminal of the Q1 port is connected to the input terminal of logic circuit U15 and the second input terminal of logic circuit U16. The output terminal of logic circuit U15 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the first terminal of capacitor C5 and the first input terminal of logic circuit U16. The second terminal of capacitor C5 is grounded. The output terminal of logic circuit U16 is connected to the R terminal of logic circuit U18. The second output terminal of logic circuit U18 is connected to the second input terminal of logic circuit U17 and the first terminal of resistor R8. The second terminal of resistor R8 is connected to the first terminal of capacitor C9 and the first input terminal of logic circuit U17. The output terminal of logic circuit U17 is connected to the control terminal of switching transistors M4-M5. The second terminal of capacitor C9 is grounded. The circuit connected to the output terminal of the Q2 port is the same as that of the Q1 port.

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