Adjusting circuit with light and color adjusting function and LED driving circuit
By designing an adjustment circuit with dimming and color adjustment functions, and combining a constant current circuit, a color adjustment circuit, a signal processing circuit, and a receiving circuit, the problem of poor stability in dimming and color temperature adjustment of LED driver circuits was solved, achieving stable dimming and color adjustment effects and improving the user experience.
Patent Information
- Application Number
- CN202322685977.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-07
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2033-10-07
AI Technical Summary
Existing LED driver circuits have poor stability in dimming and color temperature adjustment, making it difficult to meet users' diverse needs for brightness and color temperature, resulting in a poor user experience.
A dimming and color-adjusting adjustment circuit with dimming and color-adjusting functions was designed, including a pre-stage input module and a post-stage dimming and color-adjusting module. Through the combination of a constant current circuit, a color-adjusting circuit, a signal processing circuit, a dimming receiving circuit, and a color-adjusting receiving circuit, stable control of dimming and color-adjusting is achieved, avoiding the use of switching circuits.
It achieves stable dimming and color adjustment of LED lights, improves user experience, enhances the stability and flexibility of adjustment, and meets the usage needs in different environments.
Smart Images
Figure CN223968011U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lighting adjustment, and more specifically, to an adjustment circuit and an LED driver circuit with dimming and color adjustment functions. Background Technology
[0002] LED lighting fixtures often require dimming and even color adjustment during use to meet the needs of different application scenarios. Currently, many LED drivers with 0-10V adjustable voltage only offer brightness adjustment, while the color temperature remains fixed. This makes it difficult to meet the needs of different customers who require adjustments to both brightness and color temperature in different environments.
[0003] To meet the requirement of simultaneously dimming and color temperature adjustment, the commonly used solution is to switch between dimming and color temperature adjustment. Although this method is relatively simple in structure, it has poor stability, resulting in poor dimming or color temperature adjustment effects and a poor user experience. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an adjustment circuit and an LED driving circuit with dimming and color adjustment functions.
[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an adjustment circuit with dimming and color adjustment function, including: a front-stage input module and a rear-stage dimming and color adjustment module;
[0006] The post-stage dimming and color tuning module includes: a constant current circuit, a color tuning circuit, a signal processing circuit, a dimming receiving circuit, and a color tuning receiving circuit;
[0007] The input terminal of the dimming receiving circuit is connected to an external dimming circuit, and the output terminal of the dimming receiving circuit is connected to the dimming input terminal of the signal processing circuit. The input terminal of the color tuning receiving circuit is connected to an external color tuning circuit, and the output terminal of the color tuning receiving circuit is connected to the color tuning input terminal of the signal processing circuit. The first output terminal of the signal processing circuit is connected to the control terminal of the constant current circuit, and the second output terminal of the signal processing circuit is connected to the control terminal of the color tuning circuit. The input terminal of the constant current circuit is connected to the pre-amplifier input module, and the output terminal of the constant current circuit is connected to the positive terminal of the lamp board. The color tuning circuit is also connected to the negative terminals of the constant current circuit and the lamp board, respectively.
[0008] In the adjustment circuit with dimming and color adjustment function described in this utility model, the constant current circuit is a constant current circuit with adjustable current.
[0009] In the adjustment circuit with dimming and color adjustment function described in this utility model, the constant current circuit includes: a constant current chip, a fourth capacitor, a first diode, a first inductor, a sixth capacitor, and a third resistor;
[0010] The first pin of the constant current chip is connected to the output terminal of the preamplifier input module, the second pin of the constant current chip is connected to the first output terminal of the signal processing circuit, the first pin of the constant current chip is also grounded through the fourth capacitor, the fifth and sixth pins of the constant current chip are connected, and the fifth pin of the constant current chip is also connected to the color tuning circuit through the first inductor and the third resistor in sequence, the anode of the first diode is connected to the fifth pin of the constant current chip, the cathode of the first diode is connected to the output terminal of the preamplifier input module, the first terminal of the sixth capacitor is connected to the positive terminal of the lamp board, and the second terminal of the sixth capacitor is connected to the connection terminal of the first inductor and the third resistor.
[0011] In the adjustment circuit with dimming and color-tuning functions described in this utility model, the color-tuning circuit includes: an adjustment chip, a fourth resistor, a seventh capacitor, a first driving transistor, and a second driving transistor; the lamp board includes: a first set of light strings and a second set of light strings.
[0012] The first end of the fourth resistor is connected to the output end of the preamplifier input module. The second end of the fourth resistor is connected to the first pin of the adjustment chip and the first end of the seventh capacitor. The second end of the seventh capacitor is grounded. The second pin of the adjustment chip is connected to the eighth pin of the constant current chip and the third resistor. The seventh pin of the adjustment chip is connected to the second output end of the signal processing circuit. The third pin of the adjustment chip is connected to the first end of the second driver transistor. The fourth pin of the adjustment chip is connected to the first end of the first driver transistor. The second end of the first driver transistor is connected to the negative terminal of the first group of LED strings. The third end of the first driver transistor is connected to the eighth pin of the constant current chip. The second end of the second driver transistor is connected to the negative terminal of the second group of LED strings. The third end of the second driver transistor is connected to the eighth pin of the constant current chip.
[0013] The seventh pin of the adjustment chip is the control terminal of the color adjustment circuit.
[0014] In the adjustment circuit with dimming and color adjustment function described in this utility model, both the first driving transistor and the second driving transistor are MOS transistors;
[0015] The first end of the first driving transistor is the gate of the MOS transistor, the second end of the first driving transistor is the drain of the MOS transistor, and the third end of the first driving transistor is the source of the MOS transistor.
[0016] The first end of the second driving transistor is the gate of the MOS transistor, the second end of the second driving transistor is the drain of the MOS transistor, and the third end of the second driving transistor is the source of the MOS transistor.
[0017] In the adjustment circuit with dimming and color adjustment function described in this utility model, the signal processing circuit includes: a power supply chip, a third capacitor, and a signal processing chip;
[0018] The input terminal of the power supply chip is connected to the output terminal of the pre-amplifier input module, the output terminal of the power supply chip is connected to the first pin of the signal processing chip, and the ground terminal of the power supply chip is connected to the fifth pin of the signal processing chip.
[0019] The third pin of the signal processing chip is connected to the constant current circuit, the fourth pin of the signal processing chip is connected to the color tuning circuit, the sixth pin of the signal processing chip is connected to the dimming receiving circuit, and the eighth pin of the signal processing chip is connected to the color tuning receiving circuit.
[0020] The third pin of the signal processing chip is the first output terminal of the signal processing circuit, the fourth pin of the signal processing chip is the second output terminal of the signal processing circuit, the sixth pin of the signal processing chip is the dimming input terminal of the signal processing circuit, and the eighth pin of the signal processing chip is the color adjustment input terminal of the signal processing circuit; the third capacitor is connected between the first pin and the fifth pin of the signal processing chip.
[0021] In the adjustment circuit with dimming and color adjustment function described in this utility model, the dimming receiving circuit includes: a first reference voltage regulator chip, a first resistor, a second resistor, a first switching transistor, a second diode, a first voltage regulator, a fifth resistor, a sixth resistor, and a seventh resistor;
[0022] The first terminal of the first reference voltage regulator chip and the first terminal of the second resistor are connected to the output terminal of the preamplifier input module. The second terminal of the first reference voltage regulator chip is connected to the first terminal of the first resistor and the first terminal of the first switching transistor. The third terminal of the first reference voltage regulator chip is connected to the first terminal of the second resistor. The second terminal of the second resistor is connected to the second terminal of the first switching transistor. The third terminal of the first switching transistor is connected to the anode of the second diode. The cathode of the second diode is connected to the cathode of the first voltage regulator chip. The anode of the first voltage regulator chip is grounded.
[0023] The first end of the sixth resistor is connected to the first end of the fifth resistor and the sixth pin of the signal processing chip. The second end of the fifth resistor is grounded. The second end of the sixth resistor is connected to the cathode of the second diode and the first end of the seventh resistor. The second end of the seventh resistor is connected to the positive terminal of the external dimming circuit.
[0024] In the adjustment circuit with dimming and color adjustment function described in this utility model, the color adjustment receiving circuit includes: a second reference voltage regulator chip, an eleventh resistor, an eighth resistor, a second switching transistor, a third diode, a second voltage regulator, a ninth resistor, a tenth resistor, and a twelfth resistor.
[0025] The first terminal of the second reference voltage regulator chip and the first terminal of the eighth resistor are connected to the output terminal of the preamplifier input module. The second terminal of the second reference voltage regulator chip is connected to the first terminal of the eleventh resistor and the first terminal of the second switching transistor. The third terminal of the second reference voltage regulator chip is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the second terminal of the second switching transistor. The third terminal of the second switching transistor is connected to the anode of the third diode. The cathode of the third diode is connected to the cathode of the second voltage regulator chip. The anode of the second voltage regulator chip is grounded.
[0026] The first end of the tenth resistor is connected to the first end of the twelfth resistor and the eighth pin of the signal processing chip. The second end of the twelfth resistor is grounded. The second end of the tenth resistor is connected to the cathode of the third diode and the first end of the ninth resistor. The second end of the ninth resistor is connected to the positive terminal of the external color tuning circuit.
[0027] In the adjustment circuit with dimming and color adjustment function described in this utility model, both the first switching transistor and the second switching transistor are transistors.
[0028] The first terminal of the first switching transistor is the base of the transistor, the second terminal of the first switching transistor is the emitter of the transistor, and the third terminal of the first switching transistor is the collector of the transistor.
[0029] The first terminal of the second switch is the base of the transistor, the second terminal of the second switch is the emitter of the transistor, and the third terminal of the second switch is the collector of the transistor.
[0030] This utility model also provides an LED driving circuit, including the adjustment circuit with dimming and color adjustment functions described above.
[0031] The adjustment circuit and LED driver circuit with dimming and color-adjusting functions of this utility model have the following beneficial effects: It includes a pre-stage input module and a post-stage dimming and color-adjusting module; the post-stage dimming and color-adjusting module includes a constant current circuit, a color-adjusting circuit, a signal processing circuit, a dimming receiving circuit, and a color-adjusting receiving circuit; the dimming receiving circuit is connected to both the external dimming circuit and the signal processing circuit, and vice versa; the first output terminal of the signal processing circuit is connected to the control terminal of the constant current circuit, and the second output terminal of the signal processing circuit is connected to the control terminal of the color-adjusting circuit; the constant current circuit is also connected to the positive terminal of the pre-stage input module and the LED board, and the color-adjusting circuit is connected to both the negative terminal of the constant current circuit and the LED board. This utility model achieves dimming and color-adjusting through the constant current circuit and the color-adjusting circuit respectively, eliminating the need for a switching circuit, thus achieving the purpose of dimming and color-adjusting while improving the stability of adjustment and effectively enhancing the user experience. 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 diagram of the principle of the adjustment circuit with dimming and color adjustment function provided by this utility model;
[0034] Figure 2 This is a circuit diagram of the dimming and color-adjusting module 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] Figure 1 A preferred embodiment of the adjustment circuit with dimming and color adjustment functions provided in this utility model is shown.
[0037] Specifically, such as Figure 1 As shown, in this embodiment, the adjustment circuit with dimming and color adjustment functions includes: a pre-stage input module 10 and a post-stage dimming and color adjustment module 20.
[0038] In this embodiment, the pre-amplifier input module 10 includes: an AC input terminal 11, an EMC circuit 12, a rectifier and filter circuit 13, an isolation transformer circuit 14, and a constant voltage output circuit 16, connected in sequence. Further, as... Figure 1As shown, in this embodiment, the pre-amplifier input module 10 further includes a control circuit 15 connected to the output terminal of the rectifier filter circuit 13 and the isolation transformer circuit 14.
[0039] In this embodiment, AC input terminal 11 is used to connect AC voltage; EMC circuit 12 is used to suppress radiation and interference from the drive to external devices; rectifier and filter circuit 13 is used to rectify and filter AC voltage; isolation transformer circuit 14 is used to convert the high voltage output by rectifier and filter circuit 13 into a safe low voltage; control circuit 15 is used to sample and process isolation transformer circuit 14 and then control isolation transformer circuit 14 to output a stable voltage; constant voltage output circuit 16 is used to rectify and filter the low voltage output by isolation transformer circuit 14, thereby outputting a stable DC power to the subsequent dimming and color tuning module 20.
[0040] In this embodiment, the AC input terminal 11, EMC circuit 12, rectifier filter circuit 13, isolation transformer circuit 14, and constant voltage output circuit 16 can all adopt conventional circuit structures in existing LED driver power supplies, and this utility model does not impose specific limitations.
[0041] In this embodiment, as Figure 1 As shown, the post-stage dimming and color-tuning module 20 includes: a constant current circuit 21, a color-tuning circuit 22, a signal processing circuit 23, a dimming receiving circuit 24, and a color-tuning receiving circuit 25. The input terminal of the dimming receiving circuit 24 is connected to an external dimming circuit, and the output terminal of the dimming receiving circuit 24 is connected to the dimming input terminal of the signal processing circuit 23. The input terminal of the color-tuning receiving circuit 25 is connected to the external color-tuning circuit 22, and the output terminal of the color-tuning receiving circuit 25 is connected to the color-tuning input terminal of the signal processing circuit 23. The first output terminal of the signal processing circuit 23 is connected to the control terminal of the constant current circuit 21, and the second output terminal of the signal processing circuit 23 is connected to the control terminal of the color-tuning circuit 22. The input terminal of the constant current circuit 21 is connected to the pre-stage input module 10, and the output terminal of the constant current circuit 21 is connected to the positive terminal of the lamp panel. The color-tuning circuit 22 is also connected to both the constant current circuit 21 and the negative terminal of the lamp panel.
[0042] Specifically, in this embodiment, the constant current circuit 21 is used to adjust its own output current according to the dimming control signal output by the signal processing circuit 23, so as to change the current of the lamp beads or lamp strings in the lamp board, thereby achieving the purpose of dimming. Optionally, the constant current circuit 21 is an adjustable current constant current circuit 21.
[0043] In this embodiment, the color adjustment circuit 22 is used to adjust the on / off time of the LED beads or LED strings in the lamp board according to the color adjustment control signal output by the signal processing circuit 23, thereby achieving the purpose of color adjustment.
[0044] In this embodiment, the signal processing circuit 23 generates a corresponding dimming control signal based on the dimming signal output by the dimming receiving circuit 24, and sends the dimming control signal to the constant current circuit 21. The constant current circuit 21 adjusts its output current according to the dimming control signal to change the current of the LEDs or LED strings in the lamp panel, thereby achieving dimming. Further, in this embodiment, the signal processing circuit 23 also generates a corresponding color tuning control signal based on the color tuning signal output by the color tuning receiving circuit 25, and sends the color tuning control signal to the color tuning circuit 22. The color tuning circuit 22 adjusts the on / off time of different groups of LEDs or LED strings in the lamp panel according to the color tuning control signal, thereby achieving color tuning.
[0045] In this embodiment, the dimming receiving circuit 24 is used to connect to an external dimming circuit, generate a corresponding dimming signal according to the adjustment of the external dimming circuit, and send the generated dimming signal to the signal processing circuit 23. Optionally, in this embodiment, the port of the dimming receiving circuit 24 can be connected to an active 0-10V dimming signal or provide a constant current of about 100uA. Therefore, the port of the dimming receiving circuit 24 can also be connected to a 0-10V passive dimming signal or a 0-100KΩ resistor. In other words, the external dimming circuit can be a 0-10V regulator, or it can be a resistor regulator with a 0-100KΩ resistor. When the external dimming circuit is a 0-10V regulator, continuous dimming adjustment can be achieved; when the external dimming circuit is a resistor regulator with a 0-100KΩ resistor, power adjustment can be achieved. For example, if the resistor regulator is a multi-level resistor regulator with DIP switches, power adjustment can be achieved via DIP switches.
[0046] In this embodiment, the color-tuning receiving circuit 25 is connected to the external color-tuning circuit 22, generates a corresponding color-tuning signal according to the adjustment of the external color-tuning circuit 22, and sends the generated color-tuning signal to the signal processing circuit 23. Optionally, in this embodiment, the port of the color-tuning receiving circuit 25 can be connected to an active 0-10V color-tuning signal or provide a constant current of approximately 100uA. Therefore, the port of the color-tuning receiving circuit 25 can also be connected to a 0-10V passive color-tuning signal or a 0-100KΩ resistor. In other words, the external color-tuning circuit 22 can be a 0-10V regulator, or it can be a resistor regulator with a 0-100KΩ resistor. When the external color-tuning circuit 22 is a 0-10V regulator, continuous and adjustable color-tuning can be achieved; when the external color-tuning circuit 22 is a resistor regulator with a 0-100KΩ resistor, power adjustment can be achieved. For example, if the resistor regulator is a multi-range resistor regulator with DIP switches, power adjustment can be achieved via DIP switches.
[0047] The working principle of the post-stage dimming and color grading module 20 is explained below with a specific embodiment.
[0048] In a preferred embodiment, such as Figure 2 As shown, in this embodiment, the constant current circuit 21 includes: a constant current chip U1, a fourth capacitor C4, a first diode D1, a first inductor L1, a sixth capacitor C6, and a third resistor R3.
[0049] The first pin of the constant current chip U1 is connected to the output terminal (OUT) of the preamplifier input module 10. The second pin of the constant current chip U1 is connected to the first output terminal of the signal processing circuit 23. The first pin of the constant current chip U1 is also grounded through the fourth capacitor C4. The fifth and sixth pins of the constant current chip U1 are connected, and the fifth pin of the constant current chip U1 is also connected to the color tuning circuit 22 through the first inductor L1 and the third resistor R3 in sequence. The anode of the first diode D1 is connected to the fifth pin of the constant current chip U1, and the cathode of the first diode D1 is connected to the output terminal of the preamplifier input module 10. The first end of the sixth capacitor C6 is connected to the positive terminal of the lamp board, and the second end of the sixth capacitor C6 is connected to the connection terminal of the first inductor L1 and the third resistor R3.
[0050] In this embodiment, as Figure 2 As shown, the color adjustment circuit 22 includes: adjustment chip U4, fourth resistor R4, seventh capacitor C7, first driving transistor Q1 and second driving transistor Q2; the lamp board includes: first group of lamp strings and second group of lamp strings.
[0051] The first end of the fourth resistor R4 is connected to the output terminal of the preamplifier input module 10. The second end of the fourth resistor R4 is connected to the first pin of the regulating chip U4 and the first end of the seventh capacitor C7. The second end of the seventh capacitor C7 is grounded. The second pin of the regulating chip U4 is connected to the eighth pin of the constant current chip U1 and the third resistor R3. The seventh pin of the regulating chip U4 is connected to the second output terminal of the signal processing circuit 23. The third pin of the regulating chip U4 is connected to the first end of the second driver transistor Q2. The fourth pin of the regulating chip U4 is connected to the first end of the first driver transistor Q1. The second end of the first driver transistor Q1 is connected to the negative terminal of the first group of lamp strings (e.g., ...). Figure 2 In the L-1 configuration, the third terminal of the first driving transistor Q1 is connected to the eighth pin of the constant current chip U1, and the second terminal of the second driving transistor Q2 is connected to the negative terminal of the second group of LED strings (e.g., L-1). Figure 2 In the L-2 section, the third terminal of the second driving transistor Q2 is connected to the eighth pin of the constant current chip U1. The seventh pin of the regulating chip U4 is the control terminal of the color-tuning circuit 22. The positive terminals of the first and second sets of LED strings are connected in a common anode configuration, i.e., the positive terminals of the first and second sets of LED strings are connected (e.g., L-2). Figure 2 (L+ in the middle).
[0052] Optionally, both the first driving transistor Q1 and the second driving transistor Q2 are MOSFETs. Specifically, the first terminal of the first driving transistor Q1 is the gate of the MOSFET, the second terminal of the first driving transistor Q1 is the drain of the MOSFET, and the third terminal of the first driving transistor Q1 is the source of the MOSFET; the first terminal of the second driving transistor Q2 is the gate of the MOSFET, the second terminal of the second driving transistor Q2 is the drain of the MOSFET, and the third terminal of the second driving transistor Q2 is the source of the MOSFET.
[0053] like Figure 2 As shown, in this embodiment, the signal processing circuit 23 includes: a power supply chip U2, a third capacitor C3, and a signal processing chip U3.
[0054] The input terminal of power supply chip U2 is connected to the output terminal of the pre-amplifier input module 10, and the output terminal of power supply chip U2 is connected to the first pin of signal processing chip U3. The ground terminal of power supply chip U2 is connected to the fifth pin of signal processing chip U3. The third pin of signal processing chip U3 is connected to constant current circuit 21, the fourth pin of signal processing chip U3 is connected to color tuning circuit 22, the sixth pin of signal processing chip U3 is connected to dimming receiver circuit 24, and the eighth pin of signal processing chip U3 is connected to color tuning receiver circuit 25. The third pin of signal processing chip U3 is the first output terminal of signal processing circuit 23, the fourth pin of signal processing chip U3 is the second output terminal of signal processing circuit 23, the sixth pin of signal processing chip U3 is the dimming input terminal of signal processing circuit 23, and the eighth pin of signal processing chip U3 is the color tuning input terminal of signal processing circuit 23. The third capacitor C3 is connected between the first and fifth pins of the signal processing chip.
[0055] like Figure 2 As shown, in this embodiment, the dimming receiver circuit 24 includes: a first reference voltage regulator chip U5, a first resistor R1, a second resistor R2, a first switch Q1, a second diode D2, a first voltage regulator ZD1, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.
[0056] The first terminal of the first reference voltage regulator chip U5 and the first terminal of the second resistor R2 are connected to the output terminal of the preamplifier input module 10. The second terminal of the first reference voltage regulator chip U5 is connected to the first terminal of the first resistor R1 and the first terminal of the first switching transistor Q1. The third terminal of the first reference voltage regulator chip U5 is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 is connected to the second terminal of the first switching transistor Q1. The third terminal of the first switching transistor Q1 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the cathode of the first voltage regulator ZD1. The anode of the first voltage regulator ZD1 is grounded. The first terminal of the sixth resistor R6 is connected to the first terminal of the fifth resistor R5 and the sixth pin of the signal processing chip U3. The second terminal of the fifth resistor R5 is grounded. The second terminal of the sixth resistor R6 is connected to the cathode of the second diode D2 and the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the positive terminal of the external dimming circuit (e.g., Figure 2 The D+ connection is in the diagram. The negative terminal of the external dimming circuit is... Figure 2 D- in.
[0057] like Figure 2 As shown, in this embodiment, the color tuning receiving circuit 25 includes: a second reference voltage regulator chip U6, an eleventh resistor R11, an eighth resistor R8, a second switch Q4, a third diode D3, a second voltage regulator ZD2, a ninth resistor R9, a tenth resistor R10, and a twelfth resistor R12.
[0058] The first terminal of the second reference voltage regulator chip U6 and the first terminal of the eighth resistor R8 are connected to the output terminal of the preamplifier input module 10. The second terminal of the second reference voltage regulator chip U6 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the second switch Q4. The third terminal of the second reference voltage regulator chip U6 is connected to the first terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is connected to the second terminal of the second switch Q4. The third terminal of the second switch Q4 is connected to the anode of the third diode D3. The cathode of the third diode D3 is connected to the cathode of the second Zener diode ZD2. The anode of the second Zener diode ZD2 is grounded. The first terminal of the tenth resistor R10 is connected to the first terminal of the twelfth resistor R12 and the eighth pin of the signal processing chip U3. The second terminal of the twelfth resistor R12 is grounded. The second terminal of the tenth resistor R10 is connected to the cathode of the third diode and the first terminal of the ninth resistor R9. The second terminal of the ninth resistor R9 is connected to the positive terminal of the external color adjustment circuit 22 (e.g., Figure 2 The C+ connection is used. The negative terminal of the external color-correcting circuit 22 is... Figure 2 C- in it.
[0059] Optionally, in this embodiment, both the first switch Q1 and the second switch Q4 are transistors. Specifically, the first terminal of the first switch Q1 is the base of the transistor, the second terminal of the first switch Q1 is the emitter of the transistor, and the third terminal of the first switch Q1 is the collector of the transistor; similarly, the first terminal of the second switch Q4 is the base of the transistor, the second terminal of the second switch Q4 is the emitter of the transistor, and the third terminal of the second switch Q4 is the collector of the transistor.
[0060] Specifically, such as Figure 2 As shown, during dimming, the dimming receiving circuit 24 outputs a corresponding dimming signal based on the signal generated by the external dimming circuit, and sends the dimming signal to the signal processing chip U3. After receiving the dimming signal, the signal processing chip U3 generates a corresponding dimming control signal (such as...) based on the dimming signal. Figure 2 The dimming control signal is sent from the third pin of the PWM signal to the second pin of the constant current chip U1. The constant current chip U1 adjusts its output current according to the dimming control signal input to the second pin, thereby adjusting the current of the LEDs or LED strings in the lamp board to achieve dimming. Optionally, in this embodiment, the dimming control signal is a PWM signal.
[0061] During color grading, the color grading receiving circuit 25 outputs a corresponding color grading signal based on the signal generated by the external color grading circuit 22, and sends the color grading signal to the signal processing chip U3. After receiving the color grading signal, the signal processing chip U3 generates a corresponding color grading control signal based on the color grading signal (e.g., ...). Figure 2 The color-tuning control signal (PWM2) is sent to the seventh pin of the adjustment chip U4. The adjustment chip U4 generates two sets of color-tuning signals based on the control signal received at its seventh pin. The first set of color-tuning signals is sent to the first driver transistor Q1 through its fourth pin, and the second set of color-tuning signals is sent to the second driver transistor Q2 through its third pin. Thus, the first and second sets of color-tuning signals drive the first driver transistor Q1 and the second driver transistor Q2 respectively, thereby adjusting the first and second LED strings and achieving the color-tuning purpose. The first set of color-tuning signals is in phase with the color-tuning control signal, and the second set of color-tuning signals is out of phase with the color-tuning control signal. Optionally, in this embodiment, the color-tuning control signal is a PWM signal.
[0062] Specifically, color adjustment is achieved by adjusting the on / off times of the first driving transistor Q1 and the second driving transistor Q2 using the first and second sets of color adjustment signals, respectively. For example, when the duty cycle of the color adjustment control signal is large, the conduction time of the first group of LEDs driven by the first driving transistor Q1 is longer, and the conduction time of the second group of LEDs driven by the second driving transistor Q2 is shorter; conversely, when the duty cycle of the color adjustment control signal is small, the conduction time of the first group of LEDs driven by the first driving transistor Q1 is shorter, and the conduction time of the second group of LEDs driven by the second driving transistor Q2 is longer, thus achieving color adjustment.
[0063] It should be noted that in this embodiment, the constant current chip U1, power supply chip U2, signal processing chip U3, and regulation chip U4 can all be existing chips, meaning they can utilize their original functions without modification. For example, the constant current chip U1 can be a DIO8280, the power supply chip U2 can be a 78L05, the signal processing chip U3 can be a PMS132B, and the regulation chip U4 can be a BP5929. Similarly, the first reference voltage regulator chip U5 and the second reference voltage regulator chip U6 can also be existing chips, utilizing their original functions without modification. Furthermore, the first reference voltage regulator chip U5 and the second reference voltage regulator chip U6 can be the same chip, such as both being a TL431.
[0064] In this embodiment, the dimming receiver circuit 24 and the color-tuning receiver circuit 25 operate on the same principle. The following explanation uses the dimming receiver circuit 24 as an example.
[0065] like Figure 2As shown, the first reference voltage regulator chip U5 can provide a stable voltage of 2.5V. The first resistor R1 is the power supply current limiting resistor for the first reference voltage regulator chip U5. Since the voltage across the first reference voltage regulator chip U5 is stable, the voltage across the second resistor R2 is also basically stable. The current flowing through the second resistor R2 and the collector of the first switching transistor Q3 is also stable. The second diode D2 mainly prevents the voltage at the D+ / D- port from flowing back into the first switching transistor Q3. By setting the resistance value of the second resistor R2, the collector of the first switching transistor Q3 provides 100uA of current to the second diode. The resistance value of the sixth resistor R6 is set much larger than that of the seventh resistor R7. Therefore, the sixth resistor R6 basically consumes no current. The first voltage regulator ZD1... The first Zener diode (ZD1) is a 10V Zener diode. When the D+ / D- port is floating, a current of 100uA will be consumed through the first Zener diode (ZD1). The D+ / D- port is an external signal input port. When the port is connected to a 0-10V regulator, the voltage across the first Zener diode (ZD1) is equal to the voltage of the regulator. After being divided by the fifth resistor R5 and the sixth resistor R6, the voltage is sent to the signal processing chip U3 for processing and then a PWM signal is generated. When the port is connected to a 0-100KΩ resistor, the 100uA current will form different voltages through the resistors. For example, when the port is connected to a 50KΩ resistor, the voltage across the first Zener diode (ZD1) is U = I * R = 5V. This voltage is then divided by the fifth resistor R5 and the sixth resistor R6 and sent to the signal processing chip U3 for processing.
[0066] This invention also provides an LED driving circuit, which may include the adjustment circuit with dimming and color-adjusting functions disclosed in this invention. By setting up this adjustment circuit with dimming and color-adjusting functions, switching can be achieved without the need for a switching circuit, thus achieving the purpose of dimming and color-adjusting while improving the stability of adjustment and effectively enhancing the user experience.
[0067] 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 regulating circuit with dimming and color-adjusting functions, characterized in that, include: Pre-amplifier input module and post-amplifier dimming and color tuning module; The post-stage dimming and color tuning module includes: a constant current circuit, a color tuning circuit, a signal processing circuit, a dimming receiving circuit, and a color tuning receiving circuit; The input terminal of the dimming receiving circuit is connected to an external dimming circuit, and the output terminal of the dimming receiving circuit is connected to the dimming input terminal of the signal processing circuit. The input terminal of the color tuning receiving circuit is connected to an external color tuning circuit, and the output terminal of the color tuning receiving circuit is connected to the color tuning input terminal of the signal processing circuit. The first output terminal of the signal processing circuit is connected to the control terminal of the constant current circuit, and the second output terminal of the signal processing circuit is connected to the control terminal of the color tuning circuit. The input terminal of the constant current circuit is connected to the pre-amplifier input module, and the output terminal of the constant current circuit is connected to the positive terminal of the lamp board. The color tuning circuit is also connected to the negative terminals of the constant current circuit and the lamp board, respectively.
2. The adjustment circuit with dimming and color-adjusting functions according to claim 1, characterized in that, The constant current circuit is an adjustable current constant current circuit.
3. The adjustment circuit with dimming and color-adjusting functions according to claim 1, characterized in that, The constant current circuit includes: a constant current chip, a fourth capacitor, a first diode, a first inductor, a sixth capacitor, and a third resistor; The first pin of the constant current chip is connected to the output terminal of the preamplifier input module, the second pin of the constant current chip is connected to the first output terminal of the signal processing circuit, the first pin of the constant current chip is also grounded through the fourth capacitor, the fifth and sixth pins of the constant current chip are connected, and the fifth pin of the constant current chip is also connected to the color tuning circuit through the first inductor and the third resistor in sequence, the anode of the first diode is connected to the fifth pin of the constant current chip, the cathode of the first diode is connected to the output terminal of the preamplifier input module, the first terminal of the sixth capacitor is connected to the positive terminal of the lamp board, and the second terminal of the sixth capacitor is connected to the connection terminal of the first inductor and the third resistor.
4. The adjustment circuit with dimming and color-adjusting functions according to claim 3, characterized in that, The color-tuning circuit includes: an adjustment chip, a fourth resistor, a seventh capacitor, a first driving transistor, and a second driving transistor; the lamp board includes: a first set of LED strings and a second set of LED strings. The first end of the fourth resistor is connected to the output end of the preamplifier input module. The second end of the fourth resistor is connected to the first pin of the adjustment chip and the first end of the seventh capacitor. The second end of the seventh capacitor is grounded. The second pin of the adjustment chip is connected to the eighth pin of the constant current chip and the third resistor. The seventh pin of the adjustment chip is connected to the second output end of the signal processing circuit. The third pin of the adjustment chip is connected to the first end of the second driver transistor. The fourth pin of the adjustment chip is connected to the first end of the first driver transistor. The second end of the first driver transistor is connected to the negative terminal of the first group of LED strings. The third end of the first driver transistor is connected to the eighth pin of the constant current chip. The second end of the second driver transistor is connected to the negative terminal of the second group of LED strings. The third end of the second driver transistor is connected to the eighth pin of the constant current chip. The seventh pin of the adjustment chip is the control terminal of the color adjustment circuit.
5. The adjustment circuit with dimming and color-adjusting functions according to claim 4, characterized in that, Both the first driving transistor and the second driving transistor are MOSFETs; The first end of the first driving transistor is the gate of the MOS transistor, the second end of the first driving transistor is the drain of the MOS transistor, and the third end of the first driving transistor is the source of the MOS transistor. The first end of the second driving transistor is the gate of the MOS transistor, the second end of the second driving transistor is the drain of the MOS transistor, and the third end of the second driving transistor is the source of the MOS transistor.
6. The adjustment circuit with dimming and color-adjusting functions according to claim 1, characterized in that, The signal processing circuit includes: a power supply chip, a third capacitor, and a signal processing chip; The input terminal of the power supply chip is connected to the output terminal of the pre-amplifier input module, the output terminal of the power supply chip is connected to the first pin of the signal processing chip, and the ground terminal of the power supply chip is connected to the fifth pin of the signal processing chip. The third pin of the signal processing chip is connected to the constant current circuit, the fourth pin of the signal processing chip is connected to the color tuning circuit, the sixth pin of the signal processing chip is connected to the dimming receiving circuit, and the eighth pin of the signal processing chip is connected to the color tuning receiving circuit. The third pin of the signal processing chip is the first output terminal of the signal processing circuit, the fourth pin of the signal processing chip is the second output terminal of the signal processing circuit, the sixth pin of the signal processing chip is the dimming input terminal of the signal processing circuit, and the eighth pin of the signal processing chip is the color adjustment input terminal of the signal processing circuit; the third capacitor is connected between the first pin and the fifth pin of the signal processing chip.
7. The adjustment circuit with dimming and color-adjusting functions according to claim 6, characterized in that, The dimming receiver circuit includes: a first reference voltage regulator chip, a first resistor, a second resistor, a first switching transistor, a second diode, a first voltage regulator, a fifth resistor, a sixth resistor, and a seventh resistor; The first terminal of the first reference voltage regulator chip and the first terminal of the second resistor are connected to the output terminal of the preamplifier input module. The second terminal of the first reference voltage regulator chip is connected to the first terminal of the first resistor and the first terminal of the first switching transistor. The third terminal of the first reference voltage regulator chip is connected to the first terminal of the second resistor. The second terminal of the second resistor is connected to the second terminal of the first switching transistor. The third terminal of the first switching transistor is connected to the anode of the second diode. The cathode of the second diode is connected to the cathode of the first voltage regulator chip. The anode of the first voltage regulator chip is grounded. The first end of the sixth resistor is connected to the first end of the fifth resistor and the sixth pin of the signal processing chip. The second end of the fifth resistor is grounded. The second end of the sixth resistor is connected to the cathode of the second diode and the first end of the seventh resistor. The second end of the seventh resistor is connected to the positive terminal of the external dimming circuit.
8. The adjustment circuit with dimming and color-adjusting functions according to claim 7, characterized in that, The color tuning receiving circuit includes: a second reference voltage regulator chip, an eleventh resistor, an eighth resistor, a second switching transistor, a third diode, a second voltage regulator, a ninth resistor, a tenth resistor, and a twelfth resistor; The first terminal of the second reference voltage regulator chip and the first terminal of the eighth resistor are connected to the output terminal of the preamplifier input module. The second terminal of the second reference voltage regulator chip is connected to the first terminal of the eleventh resistor and the first terminal of the second switching transistor. The third terminal of the second reference voltage regulator chip is connected to the first terminal of the eighth resistor. The second terminal of the eighth resistor is connected to the second terminal of the second switching transistor. The third terminal of the second switching transistor is connected to the anode of the third diode. The cathode of the third diode is connected to the cathode of the second voltage regulator chip. The anode of the second voltage regulator chip is grounded. The first end of the tenth resistor is connected to the first end of the twelfth resistor and the eighth pin of the signal processing chip. The second end of the twelfth resistor is grounded. The second end of the tenth resistor is connected to the cathode of the third diode and the first end of the ninth resistor. The second end of the ninth resistor is connected to the positive terminal of the external color tuning circuit.
9. The adjustment circuit with dimming and color-adjusting functions according to claim 8, characterized in that, Both the first switching transistor and the second switching transistor are bipolar transistors; The first terminal of the first switching transistor is the base of the transistor, the second terminal of the first switching transistor is the emitter of the transistor, and the third terminal of the first switching transistor is the collector of the transistor. The first terminal of the second switch is the base of the transistor, the second terminal of the second switch is the emitter of the transistor, and the third terminal of the second switch is the collector of the transistor.
10. An LED driving circuit, characterized in that, The adjustment circuit with dimming and color adjustment functions as described in any one of claims 1-9 is included.