A lamp color adjusting circuit with a silicon-controlled light adjusting module
By utilizing a rectifier circuit, a multi-level DIP switch circuit, and a frequency reduction circuit, the high cost and electromagnetic interference issues of PWM dimming technology are solved, achieving stable brightness and color temperature adjustment for LED lamps and reducing hardware costs and circuit complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN DERUN INTELLIGENT TECH CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-23
AI Technical Summary
Existing PWM dimming technology in LED lighting has high hardware costs, high circuit complexity, and is prone to electromagnetic interference, making it difficult to achieve flexible brightness and color temperature adjustment.
The color temperature adjustment circuit of the lamp using the thyristor dimming module includes a rectifier circuit, a multi-level DIP switch color temperature adjustment circuit, a frequency reduction lightning circuit and a constant current dimming circuit. It controls the current path and voltage adjustment through the thyristor, and achieves brightness and color temperature adjustment by combining hardware resistors and DIP switches, reducing the reliance on precision electronic components and software algorithms.
It reduces hardware costs and circuit complexity, minimizes electromagnetic interference, achieves stable brightness and color temperature adjustment, and improves the stability and flexibility of the circuit system.
Smart Images
Figure CN224401705U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of LED circuit technology, and in particular to a color-tuning circuit for a lamp with a silicon controlled rectifier (SCR) dimming module. Background Technology
[0002] With the rapid development of LED lighting technology, the demand for brightness adjustment of lamps is becoming increasingly diversified. In home, commercial and industrial scenarios, users not only need to flexibly adjust the brightness of the lights to adapt to different environments, but also hope to optimize visual comfort or functional needs by switching color temperatures, such as switching between warm white light 3000K and cool white light 6500K.
[0003] Among related technologies, PWM dimming technology is currently one of the most commonly used core solutions in the LED lighting field. Its principle is to control the average current of the LED by adjusting the duty cycle of the pulse width modulation signal, thereby achieving continuous brightness adjustment. In monochrome LED dimming, the brightness range of a single LED is directly controlled by changing the duty cycle of the PWM signal. In multi-color LED color modulation, for example, in the color modulation of dual-color LEDs such as 3000K warm white light and 6500K cool white light, the target color temperature or color is mixed by independently adjusting the PWM duty cycle of each color channel.
[0004] However, although PWM dimming technology has been successfully applied, it still relies on precision electronic components and complex software algorithms in practical engineering, resulting in higher hardware costs and increased circuit system complexity. In addition, high-frequency PWM signals may introduce electromagnetic interference, affecting the stability of LED output. Utility Model Content
[0005] To address the above issues, this application provides a luminaire color-tuning circuit with a silicon controlled rectifier (SCR) dimming module.
[0006] The color-tuning circuit for a lamp with a silicon controlled rectifier (SCR) dimming module provided in this application adopts the following technical solution:
[0007] A color-tuning circuit for a lamp with a silicon controlled rectifier (SCR) dimming module includes a circuit system incorporating a SCR. The circuit system includes a rectifier circuit, a multi-level DIP switch color-tuning circuit, a frequency reduction circuit, a SCR current discharge circuit, and a constant current dimming circuit.
[0008] The input terminal of the rectifier circuit is connected to an external AC power supply. The output terminal of the rectifier circuit is electrically connected to the input terminals of the multi-level DIP switch color adjustment circuit and the thyristor current discharge circuit. The output terminal of the multi-level DIP switch color adjustment circuit is electrically connected to the input terminal of the frequency-de-lightning circuit. The output terminal of the frequency-de-lightning circuit is electrically connected to the input terminal of the thyristor current discharge circuit. The output terminal of the thyristor current discharge circuit is electrically connected to the input terminal of the constant current dimming circuit.
[0009] The rectifier circuit provides DC voltage to the multi-level DIP switch color adjustment circuit. The input terminal of the multi-level DIP switch color adjustment circuit receives the DC voltage from the rectifier circuit. The multi-level DIP switch color adjustment circuit generates a color adjustment signal. The output terminal of the multi-level DIP switch color adjustment circuit transmits the color adjustment signal to the frequency reduction lightning circuit. The frequency reduction lightning circuit receives the color adjustment signal and generates a stable control signal. The output terminal of the frequency reduction lightning circuit transmits the control signal to the thyristor current discharge circuit. The input terminal of the thyristor current discharge circuit receives the control signal. The thyristor current discharge circuit adjusts the current path. The output terminal of the thyristor current discharge circuit provides an appropriate operating voltage to the constant current dimming circuit. The input terminal of the constant current dimming circuit receives the power supply from the rectifier circuit and the appropriate operating voltage from the thyristor current discharge circuit. The output terminal of the constant current dimming circuit adjusts the constant current according to the voltage environment after the thyristor current discharge circuit stabilizes.
[0010] By adopting the above technical solution, the rectifier circuit stably outputs DC voltage, providing reliable power supply for the multi-level DIP color adjustment circuit, ensuring the power supply stability of the color adjustment signal generated by the multi-level DIP color adjustment circuit. After receiving the color adjustment signal, the high-frequency flicker noise in the color adjustment signal is eliminated through the processing of the flicker removal circuit, making the control signal received by the subsequent thyristor current discharge circuit purer, reducing flicker and current fluctuations during dimming and color adjustment caused by signal noise. The thyristor current discharge circuit adjusts the current path according to the flicker-removed control signal, outputting a stable rectified DC voltage, providing a stable working environment for the constant current dimming circuit. Based on the power supply of the rectifier circuit and the stable and compatible working voltage of the thyristor current discharge circuit, the current is kept constant, which reduces LED flicker caused by current fluctuations and can stably adjust the brightness according to the color adjustment requirements.
[0011] The color-tuning signal is directly generated by a multi-level DIP switch circuit, reducing the need for precision electronic components in traditional PWMV, simplifying circuit design and reducing production costs, further reducing hardware costs. At the same time, it reduces the need for complex duty cycle dynamic adjustment programs required by traditional PWM, reducing software development and debugging complexity. The flicker-free circuit performs dynamic compensation and low-pass filtering on the color-tuning signal, and the output control signal is sent to the thyristor current discharge circuit, reducing electromagnetic interference caused by high-frequency PWM signals in traditional PWM dimming technology, while ensuring flicker-free LED output.
[0012] Because the circuit system incorporates a silicon controlled rectifier (SCR), the SCR adjusts the input voltage by controlling the conduction time of the AC power, thereby achieving multi-level brightness and precise control of luminous intensity. The SCR current discharge circuit adjusts the current path by receiving control signals, and together with the constant current dimming circuit, achieves a constant current output from the LED load, further suppressing electromagnetic interference and improving the stability of the circuit system. While ensuring dimming accuracy, it significantly reduces cost and circuit system complexity.
[0013] Preferably, the rectifier circuit includes an AC power input terminal, a bridge rectifier, a fusible resistor, and a varistor. The bridge rectifier is configured as chip DB1, the fusible resistor as FR1, and the varistor as RV1. The AC power input terminal includes a live wire input terminal L and a neutral wire input terminal N. One end of the fusible resistor is connected to the neutral wire input terminal N, and the other end of the fusible resistor is connected to one end of the varistor and then connected to the bridge rectifier. The live wire input terminal is connected to the bridge rectifier, and the bridge rectifier is grounded.
[0014] By adopting the above technical solution, the fuse resistor is connected in series at the neutral input terminal N. When a short circuit or overcurrent occurs in the rectifier circuit, the fuse resistor will burn out due to overload, cutting off the current path and reducing the possibility of damage to subsequent circuits due to excessive current. The varistor is connected in parallel at the input terminal of the bridge rectifier. When a transient overvoltage occurs in the rectifier circuit, the varistor will quickly conduct to discharge the excess voltage to the ground wire, protecting the bridge rectifier from high voltage impact. The bridge rectifier converts AC power to DC power. At the same time, the bridge rectifier is grounded, reducing the risk of leakage and improving safety.
[0015] Preferably, the thyristor current discharge circuit includes a chip U7, a capacitor, and a first set of resistors. The first set of resistors includes R1, R2, R3, and RS7. The capacitor includes C3. The chip U7 is connected in series with R1, R2, and R3. RS7 is connected to the REXT terminal of the chip U7. One end of C3 is connected to the OUT terminal of the chip U7.
[0016] By adopting the above technical solution, R1, R2, and R3 are typically used for current limiting. RS7 is connected to the REXT terminal of chip U7 to adjust the trigger delay time of the thyristor and match the response characteristics of the thyristor. R1, R2, and R3 are connected in series in the control circuit of chip U7 to limit the current and protect chip U7 and the thyristor. They also divide the voltage to stabilize the trigger control signal and suppress voltage surges. At the same time, when an abnormal current is detected, chip U7 triggers the thyristor to conduct, quickly dissipating the overcurrent and dynamically adjusting the current flow to protect the subsequent circuits. Capacitor C3 is connected to the OUT pin of chip U7 to filter out high-frequency noise and stabilize the output voltage, providing a smooth, low-ripple power supply for the subsequent constant current dimming circuit and ensuring the stable operation of the constant current dimming circuit.
[0017] Preferably, the multi-level DIP color adjustment circuit includes a diode D1, a second set of resistors, a DIP switch, and LED beads. The diode D1 is located at the input terminal of the multi-level DIP color adjustment circuit. The LED beads include Y1, Y2, W1, and W2. Y1 and Y2 are connected in series to form a first lamp group, and W1 and W2 are connected in series to form a second lamp group. The first lamp group and the second lamp group are connected in parallel. The second set of resistors is connected to the DIP switch, and the DIP switch controls the resistance value of the second set of resistors. The first lamp group and the second lamp group are connected to the second set of resistors.
[0018] By adopting the above technical solution, diode D1 is located at the input terminal, reducing reverse current interference and protecting circuit stability. The second set of resistors is selectively connected to the circuit through a DIP switch to adjust the total resistance of the LED current path. The first and second LED groups are connected in parallel, and the voltage distribution of each first and second LED group is controlled by the voltage divider of the second set of resistors to achieve the adjustment of LED brightness. This setting reduces the need for precision electronic components used in traditional PWM, relying only on the second set of resistors and DIP switches, which significantly reduces hardware costs. At the same time, it reduces the need for complex duty cycle dynamic adjustment programs required by traditional PWM. Color adjustment is achieved by matching the second set of resistors with the LEDs, reducing the complexity of software development and debugging.
[0019] Preferably, the frequency reduction circuit includes chip U8, chip U9, and capacitors, including C4, C5, and C6. C5 is connected to the VC terminal of chip U8, C4 is connected to the VC terminal of chip U9, and C6 is connected in parallel with chip U9.
[0020] By adopting the above technical solution, C5 is connected to the VC terminal of chip U8 and C4 is connected to the VC terminal of chip U9, respectively filtering the voltage control terminals of chip U8 and chip U9 to ensure the stability of the output voltage of chip U8 and chip U9, and reduce the flicker of LED beads caused by power fluctuations or load changes. C6 is connected in parallel with chip U9 to further suppress high-frequency noise, improve the overall anti-interference capability of the circuit, and reduce abnormal flicker caused by external electromagnetic interference.
[0021] Preferably, the frequency reduction circuit further includes an electrolytic capacitor and a third set of resistors. The electrolytic capacitor includes EC1 and EC2, which are connected in parallel. The third set of resistors includes R4 and R5, which are connected in parallel across EC1 and EC2.
[0022] By adopting the above technical solution, EC1 mainly undertakes the energy storage function, smooths the output voltage fluctuation, and suppresses low-frequency ripple. EC2 further filters out high-frequency noise and works together with EC1 to ensure the smooth and stable output voltage. The third set of resistors R4 and R5 are connected in parallel across the electrolytic capacitor. After power is cut off, the residual charge is quickly released, reducing the risk of electric shock and ensuring operational safety.
[0023] Preferably, the constant current dimming circuit includes a fourth set of resistors, chip U1, chip U2, and chip U3. Chips U1, U2, and U3 are connected in parallel. The fourth set of resistors includes RS1, RS2, and RS3. RS1 is connected to the REXT terminal of chip U1, RS2 is connected to the REXT terminal of chip U2, and RS3 is connected to the REXT terminal of chip U3.
[0024] By adopting the above technical solution, chips U1, U2 and U3 are connected in parallel with independent external resistors RS1, RS2 and RS3 to set the current threshold, and the three sets share the load current to ensure that the output current is constant and adjustable. The thyristor current discharge circuit provides a suitable power supply for the subsequent constant current dimming circuit. The stable voltage environment can maintain the current accuracy and reduce the brightness fluctuation caused by the unstable input when the voltage fluctuates.
[0025] Preferably, the constant current dimming circuit is provided in two sets.
[0026] By adopting the above technical solution, the two sets of constant current dimming circuits can drive different LED beads respectively, realizing zoned lighting and dimming of LED beads with different color temperatures.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. The rectifier circuit provides a stable DC voltage for the multi-level DIP switch color-tuning circuit. The multi-level DIP switch color-tuning circuit generates color-tuning signals, replacing the reliance on precision components and complex software in traditional PWM dimming, significantly reducing hardware costs and circuit system complexity. The de-frequencying circuit performs low-pass filtering on the color-tuning signal, eliminating high-frequency noise and flicker interference, and outputs a clean control signal to the SCR current discharge circuit, suppressing electromagnetic interference and ensuring flicker-free LEDs. The SCR current discharge circuit adjusts the current path according to the control signal output by the de-frequencying circuit, stabilizing the rectified voltage environment. Combined with the constant current dimming circuit, it achieves constant current output from the LED load, further improving the stability of the circuit system. This design ensures dimming accuracy and color-tuning flexibility while taking into account cost control, anti-interference ability, and scalability, making it suitable for LED lighting scenarios that are sensitive to stability and cost.
[0029] 2. R1, R2, and R3 are connected in series in the control circuit of U7. They protect the chip U7 and the thyristor from overcurrent damage by limiting current, and stabilize the trigger signal and suppress voltage surges by acting as a voltage divider. RS7 is connected to the REXT pin of U7, allowing dynamic adjustment of the thyristor trigger delay time to match the thyristor's response characteristics. When an abnormal current is detected, chip U7 triggers the thyristor to conduct, quickly discharging the overcurrent and dynamically adjusting the current flow direction, thereby protecting the subsequent circuitry. Simultaneously, capacitor C3 is connected to the OUT pin of U7, filtering out high-frequency noise, stabilizing the output voltage, and providing a smooth, low-ripple power supply for the subsequent constant current dimming circuit, ensuring its stable operation.
[0030] 3. The multi-level DIP switch color adjustment circuit uses diode D1 at the input terminal to prevent reverse current interference and protect circuit stability. LED beads Y1 and Y2 are connected in series to form the first lamp group, and W1 and W2 are connected in series to form the second lamp group. The first and second lamp groups are connected in parallel. Combined with the second set of resistors, the circuit is selectively connected through the DIP switch to adjust the total resistance of the current path, thereby realizing the current distribution and brightness adjustment of each lamp group. This replaces the reliance on precision electronic components and complex software algorithms of traditional PWM dimming. It only matches the LED lamp groups through resistor voltage division and DIP switch hardware logic, which significantly reduces hardware costs and software development complexity, and realizes the color adjustment function of LED beads. Attached Figure Description
[0031] Figure 1 This is a circuit diagram of an embodiment of this application.
[0032] Figure 2 This is a schematic diagram of a rectifier circuit according to an embodiment of this application.
[0033] Figure 3 This is a schematic diagram of a multi-level DIP switch color adjustment circuit according to an embodiment of this application.
[0034] Figure 4 This is a schematic diagram of the de-frequency lightning circuit according to an embodiment of this application.
[0035] Figure 5 This is a schematic diagram of a thyristor current discharge circuit according to an embodiment of this application.
[0036] Figure 6 This is a schematic diagram of a constant current dimming circuit according to an embodiment of this application.
[0037] Figure 7 This is a system block diagram of an embodiment of this application.
[0038] Explanation of reference numerals in the attached diagram: 1. Rectifier circuit; 2. Multi-level DIP switch color adjustment circuit; 3. Frequency removal lightning circuit; 4. Thyristor current discharge circuit; 5. Constant current dimming circuit. Detailed Implementation
[0039] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.
[0040] This application discloses a color-tuning circuit for a lamp with a silicon controlled rectifier (SCR) dimming module. (Refer to...) Figure 1 A color-tuning circuit for a lamp with a silicon controlled rectifier (SCR) dimming module includes a circuit system comprising a rectifier circuit 1, a multi-level DIP switch color-tuning circuit 2, a frequency-removing lightning circuit 3, a SCR current discharge circuit 4, and a constant current dimming circuit 5.
[0041] Furthermore, the input terminal of the rectifier circuit 1 is connected to an external AC power supply, and the output terminal of the rectifier circuit 1 is electrically connected to the input terminal of the multi-level DIP switch color adjustment circuit 2 and the input terminal of the thyristor current discharge circuit 4. The output terminal of the multi-level DIP switch color adjustment circuit 2 is electrically connected to the input terminal of the frequency reduction lightning circuit 3, the output terminal of the frequency reduction lightning circuit 3 is electrically connected to the input terminal of the thyristor current discharge circuit 4, and the output terminal of the thyristor current discharge circuit 4 is electrically connected to the input terminal of the constant current dimming circuit 5.
[0042] Simultaneously, rectifier circuit 1 provides DC voltage to multi-level DIP color adjustment circuit 2. The input terminal of multi-level DIP color adjustment circuit 2 receives the DC voltage from rectifier circuit 1, generates a color adjustment signal, and transmits the color adjustment signal to frequency de-lighting circuit 3. Frequency de-lighting circuit 3 receives the color adjustment signal and generates a stable control signal. The output terminal of frequency de-lighting circuit 3 transmits the control signal to SCR current discharge circuit 4. The input terminal of SCR current discharge circuit 4 receives the control signal, adjusts the current path, and provides an adaptive operating voltage to constant current dimming circuit 5. The input terminal of constant current dimming circuit 5 receives the power supply from rectifier circuit 1 and the voltage environment stabilized by SCR current discharge circuit 4. The output terminal of constant current dimming circuit 5 adjusts the constant current according to the voltage environment stabilized by SCR current discharge circuit 4.
[0043] This demonstrates that the rectifier circuit 1 provides a stable DC voltage output, ensuring reliable power supply for the multi-level DIP color adjustment circuit 2 and guaranteeing the stability of the power supply for the color adjustment signal generated by the multi-level DIP color adjustment circuit 2. After receiving the color adjustment signal, the high-frequency flicker noise in the color adjustment signal is eliminated through the processing of the flicker removal circuit 3, making the control signal received by the subsequent thyristor current discharge circuit 4 purer and reducing abnormalities such as flickering and current fluctuations during dimming and color adjustment caused by signal noise. The thyristor current discharge circuit 4 adjusts the current path according to the flicker-removed control signal to stabilize the rectified DC voltage output, providing a stable voltage working environment for the constant current dimming circuit 5. Based on the rectified power supply and the stable voltage environment of the thyristor current discharge circuit 4, the current is kept constant, which reduces LED flickering caused by current fluctuations and allows for stable brightness adjustment according to color adjustment requirements.
[0044] To further explain, the multi-level DIP switch color-tuning circuit 2 directly generates the color-tuning signal, reducing the need for precision electronic components or software algorithms, simplifying circuit design and reducing production costs, significantly reducing hardware costs, and eliminating the need for complex duty cycle dynamic adjustment programs required by traditional PWM, thus reducing software development and debugging complexity. The frequency-reducing flash circuit 3 performs dynamic compensation and low-pass filtering on the color-tuning signal, and the output control signal is sent to the thyristor current discharge circuit 4, reducing electromagnetic interference caused by high-frequency PWM signals in traditional PWM dimming technology, while ensuring flicker-free LED output. The thyristor current discharge circuit 4 adjusts the current path through trigger control, and in conjunction with the current feedback mechanism of the constant current dimming circuit 5, achieves constant current output of the LED load, further suppressing electromagnetic interference and improving circuit system stability. This design significantly reduces cost and circuit system complexity while ensuring dimming accuracy, and effectively solves the electromagnetic interference problem of traditional PWM dimming through the low-frequency current regulation characteristics of the thyristor.
[0045] Reference Figure 2 Specifically, the rectifier circuit 1 includes an AC power input terminal, a bridge rectifier, a fuse resistor, and a varistor. The AC power input terminal includes a live wire input terminal L and a neutral wire input terminal N, which is a common power connection method for household and commercial use. The bridge rectifier is set to chip DB1, the fuse resistor is set to FR1, and the varistor is set to RV1.
[0046] Furthermore, fusible resistors typically possess specific fusing characteristics; when the current in the circuit is too high, the fusible resistor will automatically melt, thus protecting the circuit. Varistors, on the other hand, have non-linear volt-ampere characteristics; when the voltage exceeds a certain value, the resistance of the varistor will decrease sharply, thereby protecting the circuit from overvoltage damage. For example, zinc oxide varistors are commonly used in this application. One end of the fusible resistor is connected to the neutral input terminal N, and the other end is connected to one end of the varistor, both connected to a bridge rectifier. The live wire input terminal is directly connected to the bridge rectifier, which is then connected to the ground wire. This connection method converts external AC power to DC power, providing a stable DC voltage for subsequent circuits.
[0047] Reference Figure 3 Correspondingly, the multi-level DIP color adjustment circuit 2 includes diode D1, a second group of resistors, a DIP switch, and LED beads. Diode D1 generally has unidirectional conduction characteristics. Diode D1 is located at the input terminal of the multi-level DIP color adjustment circuit 2, which can reduce the reverse current flow and play a role in protecting the circuit. The LED beads include Y1, Y2, W1, and W2. Y1 and Y2 are connected in series to form the first lamp group, and W1 and W2 are connected in series to form the second lamp group. The first lamp group and the second lamp group are connected in parallel.
[0048] Furthermore, Y1 and Y2 emit yellow light with a color temperature of 2700k, while W1 and W2 emit white light with a color temperature of 6500k. This combination allows for the mixing of different colored lights. The DIP switch controls the resistance value of the second set of resistors. By adjusting the resistance values of these resistors, the current distribution in the circuit is changed, thereby adjusting the brightness of different colored LED beads and generating a color tuning signal. The first and second light groups are connected to the second set of resistors, enabling them to emit light of different colors and brightness according to the resistance values adjusted by the DIP switch.
[0049] Meanwhile, in this embodiment, the multi-level DIP switch color adjustment circuit 2 is set to five levels. Specifically, the second group of resistors includes R8, R9, R10, R11, R12, R13, R14, and R15. R8 and R9 are connected in parallel to the DIP switch, R10 and R11 are connected in parallel to the DIP switch, R12 and R13 are connected in parallel to the DIP switch, and R14 and R15 are connected in parallel to the DIP switch. The operator selects different levels by physically switching the switch and connecting different surface mount resistors to form five levels. The two types of LED beads, Y1, Y2, W1, and W2, are mixed to form other color temperatures. The color temperatures of the five levels are 2700K, 3000K, 4500K, 5000K, and 6500K, respectively, realizing intuitive control of the LED bead color adjustment function.
[0050] Reference Figure 4 Furthermore, the frequency reduction circuit 3 includes chip U8, chip U9, and capacitors, including C4, C5, and C6. C5 is connected to the VC terminal of chip U8, C4 is connected to the VC terminal of chip U9, and C6 is connected in parallel with chip U9.
[0051] Furthermore, C5 is connected to the VC terminal of chip U8, and C4 is connected to the VC terminal of chip U9, respectively filtering the voltage control terminals of chip U8 and chip U9 to ensure the stability of the output voltage of chip U8 and chip U9 and reduce flicker caused by power fluctuations or load changes. C6 is connected in parallel with chip U9 to further suppress high-frequency noise, improve the overall anti-interference capability of the circuit, and reduce abnormal flicker caused by external electromagnetic interference.
[0052] Meanwhile, the frequency reduction circuit 3 also includes electrolytic capacitors and a third set of resistors. The electrolytic capacitors include EC1 and EC2, which are connected in parallel. The third set of resistors includes R4 and R5, which are connected in parallel across EC1 and EC2. EC1 mainly performs the function of energy storage, smoothing output voltage fluctuations and suppressing low-frequency ripple. EC2 further filters out high-frequency noise and works together with EC1 to ensure smooth and stable output voltage. The third set of resistors R4 and R5 are connected in parallel across the electrolytic capacitors. After power is cut off, they quickly release residual charge, reducing the risk of electric shock and ensuring operational safety.
[0053] Furthermore, in this embodiment, a silicon controlled rectifier (SCR) is used. The SCR adjusts the input voltage by controlling the conduction time of the AC power in the circuit system, thereby achieving multi-level brightness levels and accurately controlling the luminous intensity and color mixing ratio of the LED beads. It has the advantages of high efficiency and energy saving, wide range dimming and low cost to adapt to mains power.
[0054] Reference Figure 5 Correspondingly, the thyristor current discharge circuit 4 includes chip U7, capacitor, and a first set of resistors. The first set of resistors includes R1, R2, R3, and RS7. Chip U7 is connected in series with R1, R2, and R3. RS7 is connected to the REXT terminal of chip U7. The capacitor includes C3, one end of which is connected to the OUT terminal of chip U7.
[0055] This explains why R1, R2, and R3 are typically used for current limiting. RS7 is connected to the REXT terminal of chip U7 to adjust the trigger delay time of the thyristor and match its response characteristics. R1, R2, and R3 are connected in series in the control circuit of chip U7 to limit current and protect chip U7 and the thyristor. They also divide the voltage to stabilize the trigger control signal and suppress voltage surges. At the same time, when an abnormal current is detected, chip U7 triggers the thyristor to conduct, quickly dissipating the overcurrent and dynamically adjusting the current flow to protect the subsequent circuits. Capacitor C3 is connected to the OUT pin of chip U7 to filter out high-frequency noise and stabilize the output voltage, providing a smooth, low-ripple power supply for the subsequent constant current dimming circuit 5 and ensuring the stable operation of the constant current dimming circuit 5.
[0056] Reference Figure 6 Meanwhile, the constant current dimming circuit 5 includes a fourth set of resistors, chip U1, chip U2 and chip U3. Chips U1, U2 and U3 are connected in parallel. Chips U1, U2 and U3 have precise constant current control function and can adjust the constant current of the LED load according to the input control signal and color adjustment signal. The fourth set of resistors includes RS1, RS2 and RS3. RS1 is connected to the REXT terminal of chip U1, RS2 is connected to the REXT terminal of chip U2 and RS3 is connected to the REXT terminal of chip U3.
[0057] Furthermore, chips U1, U2, and U3 are connected in parallel with independent external resistors RS1, RS2, and RS3 to set current thresholds, ensuring that the output current is constant and adjustable. The thyristor current discharge circuit 4 provides a smooth, low-ripple power supply for the subsequent constant current dimming circuit 5, stabilizing the voltage environment and maintaining current accuracy even when the voltage fluctuates, thus reducing brightness fluctuations caused by unstable input.
[0058] Meanwhile, the constant current dimming circuit 5 is provided in two sets. The two sets of constant current dimming circuits 5 can drive different LED loads respectively to realize regional lighting or dimming of LED beads with different color temperatures.
[0059] Specifically, the second constant current dimming circuit 5 includes a fifth group of resistors, chip U4, chip U5 and chip U6, and a fourth group of resistors including RS4, RS5 and RS6. RS4 is connected to the REXT terminal of chip U4, RS5 is connected to the REXT terminal of chip U5, and RS6 is connected to the REXT terminal of chip U6.
[0060] The implementation principle of a lamp color-tuning circuit with a silicon controlled rectifier dimming module in this application embodiment is as follows:
[0061] The rectifier circuit converts external AC power into DC voltage, providing a stable power supply for the circuit system. The multi-level DIP switch color adjustment circuit connects to a second set of resistors with different resistance values via DIP switches to adjust the current distribution of the LED beads and generate a color adjustment signal corresponding to the color temperature. The flicker removal circuit performs low-pass filtering and dynamic compensation on the color adjustment signal to eliminate high-frequency noise and flicker interference, and outputs a clean control signal to the SCR current discharge circuit. The SCR current discharge circuit is triggered to conduct according to the control signal, and dynamically adjusts the current path through the first set of resistors and capacitor C3 to stabilize the DC voltage environment of the rectified output. The constant current dimming circuit, based on the power supply of the rectifier circuit and the stabilized voltage environment, sets the current threshold through the fourth set of resistors and outputs a constant current to drive the LED load, realizing flicker-free dimming.
[0062] By replacing PWM dimming with hardware-driven logic using resistors and DIP switches, the reliance on precision components and software algorithms is reduced. Combined with the low-frequency modulation characteristics of thyristors, electromagnetic interference and circuit system complexity are significantly reduced, while ensuring dimming accuracy and stability.
[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A lamp color adjusting circuit with a silicon-controlled dimming module, applied to a lamp, characterized in that, The circuit system includes a thyristor and comprises a rectifier circuit (1), a multi-level DIP switch color adjustment circuit (2), a frequency reduction lightning circuit (3), a thyristor current discharge circuit (4), and a constant current dimming circuit (5). The input terminal of the rectifier circuit (1) is connected to an external AC power supply. The output terminal of the rectifier circuit (1) is electrically connected to the input terminal of the multi-level DIP color adjustment circuit (2) and the input terminal of the thyristor current discharge circuit (4). The output terminal of the multi-level DIP color adjustment circuit (2) is electrically connected to the input terminal of the frequency-de-lightning circuit (3). The output terminal of the frequency-de-lightning circuit (3) is electrically connected to the input terminal of the thyristor current discharge circuit (4). The output terminal of the thyristor current discharge circuit (4) is electrically connected to the input terminal of the constant current dimming circuit (5). The rectifier circuit (1) provides DC voltage to the multi-level DIP color adjustment circuit (2). The input terminal of the multi-level DIP color adjustment circuit (2) receives the DC voltage from the rectifier circuit (1). The multi-level DIP color adjustment circuit (2) generates a color adjustment signal. The output terminal of the multi-level DIP color adjustment circuit (2) transmits the color adjustment signal to the frequency-de-lightning circuit (3). The frequency-de-lightning circuit (3) receives the color adjustment signal and generates a stable control signal. The output terminal of the frequency-de-lightning circuit (3) transmits the control signal to the thyristor current discharge circuit (4). The input terminal of the thyristor current discharge circuit (4) receives a control signal. The thyristor current discharge circuit (4) adjusts the current path. The output terminal of the thyristor current discharge circuit (4) provides an appropriate working voltage to the constant current dimming circuit (5). The input terminal of the constant current dimming circuit (5) receives the power supply from the rectifier circuit (1) and the appropriate working voltage provided by the thyristor current discharge circuit (4). The output terminal of the constant current dimming circuit (5) adjusts the constant current according to the voltage environment after the thyristor current discharge circuit (4) has stabilized.
2. The lamp color adjusting circuit with a thyristor dimming module according to claim 1, characterized in that, The rectifier circuit (1) includes an AC power input terminal, a bridge rectifier, a fuse resistor, and a varistor. The bridge rectifier is configured as chip DB1, the fuse resistor is configured as FR1, and the varistor is configured as RV1. The AC power input terminal includes a live wire input terminal L and a neutral wire input terminal N. One end of the fuse resistor is connected to the neutral wire input terminal N, and the other end of the fuse resistor is connected to one end of the varistor and then connected to the bridge rectifier. The live wire input terminal is connected to the bridge rectifier, and the bridge rectifier is grounded.
3. The lamp color adjusting circuit with a thyristor dimming module according to claim 1, characterized in that, The thyristor current discharge circuit (4) includes a chip U7, a capacitor and a first set of resistors. The first set of resistors includes R1, R2, R3 and RS7. The capacitor includes C3. The chip U7 is connected in series with R1, R2 and R3. RS7 is connected to the REXT terminal of the chip U7. One end of C3 is connected to the OUT terminal of the chip U7.
4. The lamp color-tuning circuit with a thyristor dimming module according to claim 1, characterized in that, The multi-level DIP color adjustment circuit (2) includes a diode D1, a second set of resistors, a DIP switch, and LED beads. The diode D1 is located at the input terminal of the multi-level DIP color adjustment circuit (2). The LED beads include Y1, Y2, W1, and W2. Y1 and Y2 are connected in series to form a first lamp group, and W1 and W2 are connected in series to form a second lamp group. The first lamp group and the second lamp group are connected in parallel. The second set of resistors is connected to the DIP switch, and the DIP switch controls the resistance value of the second set of resistors. The first lamp group and the second lamp group are connected to the second set of resistors.
5. The lighting fixture dimming and color control circuit with TRIAC dimmer module of claim 1, wherein, The frequency reduction lightning circuit (3) includes chip U8, chip U9 and capacitors. The capacitors include C4, C5 and C6. C5 is connected to the VC terminal of chip U8, C4 is connected to the VC terminal of chip U9, and C6 is connected in parallel with chip U9.
6. The lamp color-tuning circuit with a thyristor dimming module according to claim 1, characterized in that, The frequency reduction lightning circuit (3) also includes an electrolytic capacitor and a third set of resistors. The electrolytic capacitors include EC1 and EC2, which are connected in parallel. The third set of resistors includes R4 and R5, which are connected in parallel across EC1 and EC2.
7. The lamp color-tuning circuit with a thyristor dimming module according to claim 1, characterized in that, The constant current dimming circuit (5) includes a fourth set of resistors, chip U1, chip U2 and chip U3. Chips U1, U2 and U3 are connected in parallel. The fourth set of resistors includes RS1, RS2 and RS3. RS1 is connected to the REXT terminal of chip U1, RS2 is connected to the REXT terminal of chip U2 and RS3 is connected to the REXT terminal of chip U3.
8. The triac-based lamp fixture dimming and color adjustment circuit of claim 7, wherein, The constant current dimming circuit (5) is provided in two sets.