Digital dimming and color adjusting circuit
By employing current limiting, peak suppression feedback, and signal feedback mechanisms in the digital dimming and color tuning circuit, the dimming failure problem of traditional dimming circuits during high-frequency circuit switching on and off is solved, achieving a stable dimming effect.
Patent Information
- Application Number
- CN202520156343.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Traditional dimming circuits are prone to dimming failure when high-frequency switching circuits are turned on and off.
It adopts a digital dimming and color-tuning circuit, including a current limiting circuit, LED beads, peak suppression feedback circuit, switching circuit and dimming comparator circuit. By connecting to a DC power supply, it realizes current limiting, voltage reduction and signal feedback, and adapts to the circuit opening and closing of high frequency circuits.
It enables effective dimming of high-frequency circuits, ensuring stable circuit operation and preventing dimming failure.
Smart Images
Figure CN223942863U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of light source dimming technology, and in particular to a digital dimming and color tuning circuit. Background Technology
[0002] A dimming circuit is a power supply that can adjust its output voltage and current. By controlling the parameters of components in the circuit, the output power of the power supply can be regulated. Dimmable power supplies are widely used in the lighting industry. Their principle is to adjust the brightness of the light source by controlling the output voltage and current of the power supply. The user sends a control command through the dimmer, which converts the command into a digital signal. Then, the power module adjusts the current, voltage, and other parameters of the lamp according to the signal command, thereby controlling the brightness, color temperature, and other parameters of the lamp.
[0003] Traditional dimming circuits, with their feedback regulation of current and voltage, cannot adapt to the high-frequency switching of circuits, leading to dimming failures. This type of dimming and color-tuning circuit based on switching signals is a type of digital dimming and color-tuning circuit. Therefore, it is necessary to propose a digital dimming and color-tuning circuit to address the common dimming failures in traditional dimming circuits. Utility Model Content
[0004] Therefore, it is necessary to propose a digital dimming and color tuning circuit to address the shortcomings of traditional dimming circuits, which are prone to dimming failure.
[0005] This application relates to a digital dimming and color tuning circuit, electrically connected to a DC power supply, wherein the digital dimming and color tuning circuit is electrically connected to a rectangular wave space ratio adjustment chip, and the digital dimming and color tuning circuit includes:
[0006] Current limiting circuit, electrically connected to DC power supply;
[0007] LED beads are electrically connected to a DC power supply;
[0008] A peak suppression feedback circuit is electrically connected to the LED beads;
[0009] A switching circuit is electrically connected to the current limiting circuit, and the switching circuit is electrically connected to the peak suppression feedback circuit.
[0010] The dimming comparison circuit is electrically connected to the switching circuit, the dimming comparison circuit is electrically connected to the peak suppression feedback circuit, and the dimming comparison circuit is electrically connected to the rectangular wave empty ratio adjustment chip.
[0011] This application relates to a digital dimming and color-tuning circuit. A current-limiting circuit, electrically connected to a DC power supply, receives electrical energy from the DC power supply. The current-limiting circuit limits and reduces the voltage of the received energy, ensuring stable power supply to subsequent circuits. LED beads are electrically connected to the DC power supply, which in turn is connected to the current-limiting circuit, ensuring stable power supply to the LED beads. A peak suppression feedback circuit, while ensuring the LED beads have a path, uses its inductance and resistance to suppress peak power. This peak suppression feedback circuit is electrically connected to a switching circuit and a dimming comparator circuit, forming a signal feedback that acts on the dimming comparator circuit, enabling the dimming comparator circuit to control the switching circuit's on / off state. The switching circuit uses this action signal to achieve dimming. This digital dimming and color-tuning circuit can provide feedback, adjustment, and adaptation to the on / off states of high-frequency circuits, thus achieving effective dimming. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the module connection of a digital dimming and color tuning circuit provided in an embodiment of this application.
[0013] Figure 2 This is a schematic diagram of the circuit element connection partitions of a digital dimming and color tuning circuit provided in an embodiment of this application.
[0014] Figure 3 This is a circuit component connection diagram of a digital dimming and color tuning circuit provided in an embodiment of this application.
[0015] Figure 4 This is a connection diagram of the positive compensation circuit components of a digital dimming and color tuning circuit provided in an embodiment of this application.
[0016] Figure 5 This is a circuit connection diagram of the reverse compensation circuit of a digital dimming and color tuning circuit provided in an embodiment of this application.
[0017] Figure label:
[0018] a-DC power supply; b-rectangular wave idle rate adjustment chip; 100-current limiting circuit;
[0019] 110 - First current-limiting resistor; 120 - Second current-limiting resistor; 130 - First NPN transistor;
[0020] 140 - Second NPN transistor; 200 - LED chip; 300 - Peak suppression feedback circuit; 310 - Inductor;
[0021] 320 - Current suppression resistor; 400 - Switching circuit; 410 - First N-type MOSFET;
[0022] 420 - Third NPN transistor; 430 - First PNP transistor; 441 - Second N-type MOSFET;
[0023] 442 - Fifth NPN transistor; 443 - Third PNP transistor; 500 - Dimming comparator circuit;
[0024] 510 - Comparator capacitor; 520 - First comparator; 530 - Fourth NPN transistor;
[0025] 540 - Second PNP transistor; 550 - First feedback resistor; 561 - Second feedback resistor;
[0026] 562 - Second comparator; 563 - Third feedback resistor. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0028] This application provides a digital dimming and color-tuning circuit.
[0029] The digital dimming and color-tuning circuit is electrically connected to DC power supply a. The digital dimming and color-tuning circuit is also electrically connected to the rectangular wave space ratio adjustment chip b.
[0030] like Figure 1 As shown, in one embodiment of this application, a digital dimming and color tuning circuit includes:
[0031] The current limiting circuit 100 is electrically connected to the DC power supply a.
[0032] The LED beads are electrically connected to the DC power supply a.
[0033] The peak suppression feedback circuit 300 is electrically connected to the LED beads.
[0034] The switching circuit 400 is electrically connected to the current limiting circuit 100, and the switching circuit 400 is electrically connected to the peak suppression feedback circuit 300.
[0035] The dimming comparator circuit 500 is electrically connected to the switching circuit 400, the dimming comparator circuit 500 is electrically connected to the peak suppression feedback circuit 300, and the dimming comparator circuit 500 is electrically connected to the rectangular wave empty ratio adjustment chip b.
[0036] This embodiment relates to a digital dimming and color-tuning circuit. A current-limiting circuit 100, electrically connected to a DC power supply a, receives electrical energy from the DC power supply a. The current-limiting circuit 100 limits and reduces the voltage of the received energy, ensuring stable power supply to subsequent circuits. LED beads are electrically connected to the DC power supply a, and the DC power supply a is electrically connected to the current-limiting circuit 100, ensuring stable power supply to the LED beads. A peak suppression feedback circuit 300, while ensuring the LED beads' path, uses its inductor 310 and resistor to suppress peak loads. The peak suppression feedback circuit 300, while suppressing peak loads, is electrically connected to a switching circuit 400 and a dimming comparator circuit 500. The peak suppression feedback circuit 300 generates a signal feedback, which acts on the dimming comparator circuit 500, enabling the dimming comparator circuit 500 to control the switching signal of the switching circuit 400. The switching circuit 400 uses the action signal to achieve dimming. Digital dimming and color tuning circuits can provide feedback, adjust, and adapt to the on / off states of high-frequency circuits, thereby achieving effective dimming.
[0037] like Figure 2 and Figure 3 As shown, in one embodiment of this application, the current limiting circuit 100 includes a first current limiting resistor 110, a second current limiting resistor 120, a first NPN transistor 130, and a second NPN transistor 140. The collector of the first NPN transistor 130 is electrically connected to a DC power supply a. The first current limiting resistor 110 is electrically connected between the collector and base of the first NPN transistor 130. The emitter of the second NPN transistor 140 is electrically connected to the source of the first NPN transistor 130. The source of the second NPN transistor 140 is electrically connected to the source of the first NPN transistor 130. The second current limiting resistor 120 is electrically connected between the source and base of the second NPN transistor 140.
[0038] Specifically, based on the first current-limiting resistor 110, the DC power supply a uses the voltage reduction effect of the first current-limiting resistor 110 to input an electrical signal to the collector of the first NPN transistor 130. After receiving the electrical signal, the first NPN transistor 130 turns on, and uses the circuit channel opened by the first NPN transistor 130 to perform a current-draining operation on the excessive current of the DC power supply a.
[0039] The excessive leakage current flows through the second current-limiting resistor 120 to form a shunt current signal, so that the second NPN transistor 140 receives the electrical signal. At this time, the second NPN transistor 140 is turned on, and the excessive current can turn on the main circuit of the LED bead.
[0040] like Figure 3 As shown, in one embodiment of this application, the peak suppression feedback circuit 300 includes an inductor 310 and a current suppression resistor 320. The positive terminal of the LED bead is electrically connected to a DC power supply a. The first terminal of the inductor 310 is electrically connected to the negative terminal of the LED bead. The negative terminal of the LED bead is electrically connected to the first terminal of the current suppression resistor 320. The second terminal of the inductor 310 is electrically connected to the switching circuit 400. The second terminal of the current suppression resistor 320 is electrically connected to the dimming comparator circuit 500.
[0041] Specifically, inductor 310 is placed at the negative terminal of the LED chip to compensate for the delay in the LED chip's current path. This improves the feedback capability, adjustment capability, and adaptability of the digital dimming and color-tuning circuit to high-frequency circuit switching, thereby achieving effective dimming.
[0042] The second end of the current suppression resistor 320 can be electrically connected to the dimming comparator circuit 500, which is beneficial to the compensation output of the dimming comparator circuit 500, and improves the feedback capability, adjustment capability, and adaptability of the dimming circuit to the opening and closing of high frequency circuits.
[0043] The second terminal of the current-suppressing resistor 320 can be connected to a multi-stage recovery circuit, thereby using the multi-stage recovery circuit to compensate the switching circuit 400. Figure 3 The third NPN transistor 420 and the first PNP transistor 430 can be used as a multi-stage recovery circuit. In fact, the switching circuit 400 can be a multi-stage recovery circuit.
[0044] like Figure 3 As shown, in one embodiment of this application, the switching circuit 400 includes a first N-type MOSFET 410, a third NPN transistor 420, and a first PNP transistor 430. The drain of the first N-type MOSFET 410 is electrically connected to the second terminal of the inductor 310. The source of the first N-type MOSFET 410 is grounded. The collector of the first PNP transistor 430 is electrically connected to the emitter of the second NPN transistor 440. The emitter of the first PNP transistor 430 is electrically connected to the gate of the first N-type MOSFET 410. The collector of the third NPN transistor 420 is electrically connected to the gate of the first N-type MOSFET 410. The emitter of the third NPN transistor 420 is grounded. The base of the third NPN transistor 420 is electrically connected to the base of the first PNP transistor 430. The collector of the first PNP transistor 430 is electrically connected to the base of the first PNP transistor 430. The dimming comparator circuit 500 is electrically connected to the base of the third NPN transistor 420.
[0045] Specifically, the first N-type MOSFET 410 utilizes a high / low signal recovery circuit composed of the third NPN transistor 420 and the first PNP transistor 430 to receive electrical signals at the gate of the first N-type MOSFET 410, thereby controlling the on / off state of the main path of the LED bead.
[0046] like Figure 3 As shown, in one embodiment of this application, the dimming comparator circuit 500 includes a comparator capacitor 510, a first comparator 520, a fourth NPN transistor 530, and a second PNP transistor 540. The inverting input of the first comparator 520 is electrically connected to the square wave space ratio adjustment chip b. The output of the first comparator 520 is electrically connected to the base of the third NPN transistor 520. The collector of the fourth NPN transistor 530 is connected to the emitter of the second NPN transistor 540. The emitter of the fourth NPN transistor 530 is electrically connected to the first terminal of the comparator capacitor 510. The second terminal of the comparator capacitor 510 is electrically connected to the non-inverting input of the first comparator 520. The collector of the second PNP transistor 540 is electrically connected to the first terminal of the comparator capacitor 510. The emitter of the second PNP transistor 540 is grounded. The base of the fourth NPN transistor 530 is electrically connected to the base of the second PNP transistor 540. The output of the first comparator 520 is electrically connected to the base of the fourth NPN transistor 530.
[0047] Specifically, the dimming comparator circuit 500 can output an adjustment signal to the base of the third NPN transistor 420 and the base of the first PNP transistor 430, so that the first N-type MOSFET 410 receives the signal at its gate using the high / low signal recovery circuit composed of the third NPN transistor 420 and the first PNP transistor 430. This realizes the switching on and off of the main path of the LED bead.
[0048] like Figure 4 As shown, the secondary recovery circuit is electrically connected to a comparator capacitor 510, that is, the emitter of the fourth NPN transistor 530 is electrically connected to the first terminal of the comparator capacitor 510. The first comparator 520 can receive the feedback signal of the entire recovery circuit. Figure 4 In this circuit, the fourth NPN transistor 530 and the second PNP transistor 540 can be used as a secondary recovery circuit. The secondary recovery circuit can perform positive feedback compensation.
[0049] Specifically, the source of the first N-type MOSFET 410 can be electrically connected to the positive input terminal of the first comparator 520. The first comparator 520 can receive feedback signals from the main circuit of the LED beads.
[0050] like Figure 4As shown, the positive input terminal of the first comparator 520 can be electrically connected to the emitter of the second NPN transistor 140, thereby adjusting the output electrical signal of the fourth NPN transistor 530 and the second PNP transistor 540, and thus realizing the conduction and cutoff of the first N-type MOS transistor 410.
[0051] like Figure 4 As shown, in one embodiment of this application, the dimming comparator circuit 500 further includes a first feedback resistor 550. The first feedback resistor 550 is electrically connected to the connection link between the source of the first N-type MOS transistor 410 and the positive input terminal of the first comparator 520. The second terminal of the current-suppressing resistor 320 is electrically connected to the collector of the fourth NPN transistor 530. The second terminal of the current-suppressing resistor 320 is also electrically connected to the positive input terminal of the first comparator 520.
[0052] Specifically, the first feedback resistor 550 is used to provide feedback on the electrical signal of the switching circuit 400.
[0053] The second feedback resistor 561 is used to provide feedback on the electrical signals of the main circuit of the LED beads.
[0054] The first feedback resistor 550, the second feedback resistor 561, and the current suppression resistor 320 all serve as voltage divider feedback.
[0055] like Figure 5 As shown, in one embodiment of this application, the switching circuit 400 includes a second N-type MOSFET 441, a fifth NPN transistor 442, and a third PNP transistor 443. The drain of the second N-type MOSFET 441 is electrically connected to the second terminal of the inductor 310. The source of the second N-type MOSFET 441 is grounded. The collector of the fifth NPN transistor 442 is electrically connected to the emitter of the second NPN transistor 440. The emitter of the fifth NPN transistor 442 is electrically connected to the gate of the second N-type MOSFET 441. The collector of the third PNP transistor 443 is electrically connected to the gate of the second N-type MOSFET 441. The emitter of the third PNP transistor 443 is grounded. The base of the fifth NPN transistor 442 is electrically connected to the base of the fifth NPN transistor 442. The collector of the fifth NPN transistor 442 is electrically connected to the base of the fifth NPN transistor 442. The dimming comparator circuit 500 is electrically connected to the base of the fifth NPN transistor 442.
[0056] The dimming comparator circuit 500 includes a second comparator 562. The output terminal of the second comparator 562 is electrically connected to the base of the fifth NPN transistor 442. The positive input terminal of the second comparator 562 is electrically connected to the square wave space ratio adjustment chip b. The inverting input terminal of the second comparator 562 is electrically connected to the source of the second NPN transistor 140.
[0057] The dimming comparator circuit 500 includes a second feedback resistor 561. The second feedback resistor 561 is electrically connected to the connection link between the emitter of the second NPN transistor 140 and the inverting input of the second comparator 562.
[0058] The dimming comparator circuit 500 further includes a third feedback resistor 563. The second terminal of the current suppression resistor 320 is electrically connected to the inverting input terminal of the second comparator 562. The third feedback resistor 563 is disposed at the source of the second N-type MOSFET 441 and electrically connected.
[0059] like Figure 3 As shown, the source of the second NPN transistor 140 can be connected to a Zener diode to perform a grounding process for the overflowing current.
[0060] The source of the second NPN transistor 140 can be connected to the negative terminal of the LED chip for overcurrent stabilization. The peak suppression feedback circuit 300 is located at the negative terminal of the LED chip. The peak suppression feedback circuit 300 helps the source of the second NPN transistor 140 perform an overcurrent stabilization process for the overflowing current.
[0061] The source of the second NPN transistor 140 can be connected to the positive input terminal of the dimming comparator circuit 500 so that the dimming comparator circuit 500 can reverse the compensation switch circuit 400.
[0062] like Figure 4 As shown, the source of the second NPN transistor 140 can be connected to a Zener diode to perform a grounding process for the overflowing current.
[0063] The source of the second NPN transistor 140 can be connected to the secondary current limiting circuit 100. The secondary current limiting circuit 100 can perform negative terminal current sampling.
[0064] The source of the second NPN transistor 140 can be connected to the positive input terminal of the dimming comparator circuit 500 so that the dimming comparator circuit 500 can reverse the compensation switch circuit 400.
[0065] like Figure 5As shown, the source of the second NPN transistor 140 can be connected to a multi-stage recovery circuit, thereby using the multi-stage recovery circuit to compensate the switching circuit 400. The fifth NPN transistor 442 and the third PNP transistor 443 can also serve as a multi-stage recovery circuit.
[0066] The technical features of the above embodiments can be combined arbitrarily, and the execution order of the method steps is not restricted. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A digital dimming and color-tuning circuit, electrically connected to a DC power supply, wherein the digital dimming and color-tuning circuit is electrically connected to a rectangular wave space ratio adjustment chip, characterized in that, The digital dimming and color tuning circuit includes: Current limiting circuit, electrically connected to DC power supply; LED beads are electrically connected to a DC power supply; A peak suppression feedback circuit is electrically connected to the LED beads; A switching circuit is electrically connected to the current limiting circuit, and the switching circuit is electrically connected to the peak suppression feedback circuit. The dimming comparison circuit is electrically connected to the switching circuit, the dimming comparison circuit is electrically connected to the peak suppression feedback circuit, and the dimming comparison circuit is electrically connected to the rectangular wave empty ratio adjustment chip.
2. The digital dimming and color-tuning circuit according to claim 1, characterized in that, The current limiting circuit includes a first current limiting resistor, a second current limiting resistor, a first NPN transistor, and a second NPN transistor; The collector of the first NPN transistor is electrically connected to the DC power supply; The first current-limiting resistor is electrically connected to the connection link between the collector of the first NPN transistor and the base of the first NPN transistor. The emitter of the second NPN transistor is electrically connected to the source of the first NPN transistor; The source of the second NPN transistor is electrically connected to the source of the first NPN transistor; The second current-limiting resistor is electrically connected to the connection link between the source and the base of the second NPN transistor.
3. The digital dimming and color-tuning circuit according to claim 2, characterized in that, The peak suppression feedback circuit includes an inductor and a current suppression resistor; The positive terminal of the LED bead is electrically connected to a DC power supply; The first end of the inductor is electrically connected to the negative terminal of the LED bead; The negative terminal of the LED bead is electrically connected to the first terminal of the current-suppressing resistor; The second terminal of the inductor is electrically connected to the switching circuit; The second end of the current-suppressing resistor is electrically connected to the dimming comparator circuit.
4. The digital dimming and color-tuning circuit according to claim 3, characterized in that, The switching circuit includes a first N-type MOSFET, a third NPN-type transistor, and a first PNP-type transistor; The drain of the first N-type MOS transistor is electrically connected to the second terminal of the inductor; The source of the first N-type MOS transistor is grounded; The collector of the first PNP transistor is electrically connected to the emitter of the second NPN transistor; The emitter of the first PNP transistor is electrically connected to the gate of the first N-type MOS transistor; The collector of the third NPN transistor is electrically connected to the gate of the first N-type MOS transistor. The emitter of the third NPN transistor is grounded; The base of the third NPN transistor is electrically connected to the base of the first PNP transistor. The collector of the first PNP transistor is electrically connected to the base of the first PNP transistor. The dimming comparator circuit is electrically connected to the base of the third NPN transistor.
5. The digital dimming and color-tuning circuit according to claim 4, characterized in that, The dimming comparison circuit includes a comparison capacitor, a first comparator, a fourth NPN transistor, and a second PNP transistor. The inverting input of the first comparator is electrically connected to the rectangular wave empty ratio adjustment chip; The output terminal of the first comparator is electrically connected to the base of the third NPN transistor; The collector of the fourth NPN transistor and the emitter of the second NPN transistor; The emitter of the fourth NPN transistor is electrically connected to the first terminal of the comparator capacitor. The second terminal of the comparison capacitor is electrically connected to the positive input terminal of the first comparator. The collector of the second PNP transistor is electrically connected to the first terminal of the comparator capacitor; The emitter of the second PNP transistor is grounded; The base of the fourth NPN transistor is electrically connected to the base of the second PNP transistor. The output of the first comparator is electrically connected to the base of the fourth NPN transistor.
6. The digital dimming and color-tuning circuit according to claim 5, characterized in that, The dimming comparison circuit also includes a first feedback resistor; The first feedback resistor is electrically connected to the connection link between the source of the first N-type MOS transistor and the positive input terminal of the first comparator; The second end of the current-suppressing resistor is electrically connected to the collector of the fourth NPN transistor. The second end of the current-suppressing resistor is electrically connected to the positive input terminal of the first comparator.
7. The digital dimming and color-tuning circuit according to claim 3, characterized in that, The switching circuit includes a second N-type MOSFET, a fifth NPN-type transistor, and a third PNP-type transistor; The drain of the second N-type MOS transistor is electrically connected to the second terminal of the inductor; The source of the second N-type MOSFET is grounded; The collector of the fifth NPN transistor is electrically connected to the emitter of the second NPN transistor; The emitter of the fifth NPN transistor is electrically connected to the gate of the second N-type MOS transistor; The collector of the third PNP transistor is electrically connected to the gate of the second N-type MOS transistor. The emitter of the third PNP transistor is grounded; The base of the fifth NPN transistor is electrically connected to the base of the fifth NPN transistor. The collector of the fifth NPN transistor is electrically connected to the base of the fifth NPN transistor; The dimming comparator circuit is electrically connected to the base of the fifth NPN transistor.
8. The digital dimming and color-tuning circuit according to claim 7, characterized in that, The dimming comparison circuit includes a second comparator; The output of the second comparator is electrically connected to the base of the fifth NPN transistor; The positive input of the second comparator is electrically connected to the square wave empty ratio adjustment chip; The inverting input of the second comparator is electrically connected to the source of the second NPN transistor.
9. The digital dimming and color-tuning circuit according to claim 8, characterized in that, The dimming comparator circuit includes a second feedback resistor; The second feedback resistor is electrically connected to the connection link between the emitter of the second NPN transistor and the inverting input of the second comparator.
10. The digital dimming and color-tuning circuit according to claim 9, characterized in that, The dimming comparison circuit also includes a third feedback resistor; The second end of the current-suppressing resistor is electrically connected to the inverting input of the second comparator. The third feedback resistor is connected to the source of the second N-type MOS transistor.