Optical screen synchronous control circuit and atmosphere lamp

Abstract

The utility model discloses an optical screen synchronous control circuit and an atmosphere lamp, color data and a power supply of a computer are obtained through an interface module, a voltage conversion module converts an input voltage into output voltages of different levels and supplies the output voltages to a subsequent circuit, and a control module analyzes the color data and generates a five-channel driving control signal. After level conversion and signal isolation are carried out by the signal conditioning module, the five-color LED lamp strip is driven to realize color synchronous conversion, and the lamp strip power supply control module dynamically controls a power switch according to an enable signal, so that the operation safety and efficiency are ensured. The five-color LED lamp strip driving circuit realizes a rich color display effect by cascading a plurality of five-color LED lamp strip modules. According to the utility model, the technical problems of insufficient color rendition degree and separation of power supply and data transmission in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of electronic lighting control technology, and in particular to a light screen synchronization control circuit and an ambient lighting fixture. Background Technology

[0002] Currently, most ambient lighting products on the market use RGB three-primary-color technology, achieving color changes by mixing red, green, and blue light sources. While RGB three-primary-color technology can theoretically generate over 16.7 million colors, it has significant drawbacks in practical applications:

[0003] Insufficient color reproduction: White light relies on high-intensity mixing of RGB colors to generate, with the actual color temperature range limited to 6500K to 10000K. This makes it difficult to accurately represent cool and warm natural light, and color deviations are prone to occur during the light mixing process. Esports, film, and other scenarios have high requirements for the color temperature range and color accuracy of ambient light. Existing RGB solutions, lacking independent cool white and warm white light sources, struggle to reproduce the subtle transitions of light and shadow in the image, thus weakening the immersive experience.

[0004] Separation of power supply and data transmission: Many existing products rely on wireless communication (such as Wi-Fi, Bluetooth, etc.) for data transmission, which is susceptible to signal interference and requires an additional independent power adapter, resulting in the separation of power supply and data transmission and complex wiring. Although traditional wired products can transmit data via USB or HDMI interfaces, they still require an independent power adapter to drive high-power LED light strips, leading to excessive interface occupation and messy cables on desktop devices. Utility Model Content

[0005] The main purpose of this invention is to propose a screen synchronization control circuit, which aims to solve the technical problems of insufficient color reproduction and separation of power supply and data transmission in the prior art.

[0006] To achieve the above objectives, the first aspect of this utility model proposes a screen synchronization control circuit, including an interface module, a voltage conversion module, a control module, and a five-color LED strip driving circuit. The interface module's input terminal is connected to a computer's integrated communication and power supply port. The voltage conversion module's input terminal is connected to the interface module's power supply output terminal, and its output terminal outputs a first voltage and a second voltage. The control module's first input terminal is connected to the voltage conversion module's second voltage output terminal, and its second input terminal is connected to the interface module's data output terminal, used to generate a five-channel driving control signal based on screen color data and output it through the first output terminal. The five-color LED strip driving circuit has its first input terminal connected to the voltage conversion module's first voltage output terminal, and its second input terminal connected to the control module's first output terminal, dynamically adjusting the brightness of the five-color LEDs according to the five-channel driving control signal.

[0007] Preferably, the light screen synchronization control circuit further includes a light strip power supply control module, the second output terminal of which outputs an enable control signal; the light strip power supply control module is connected between the first voltage output terminal of the voltage conversion module and the first input terminal of the five-color LED light strip driving circuit, and is controlled by the enable control signal, for dynamically controlling the power supply on and off of the five-color LED light strip driving circuit.

[0008] Preferably, the LED strip power supply control module includes a first MOSFET switch, the gate of which is connected to the second output terminal of the control module, the source of which is connected to the first voltage output terminal of the voltage conversion module, and the drain of which is connected to the first input terminal of the five-color LED strip driving circuit, and is controlled by the enable control signal to switch the power supply on and off.

[0009] Preferably, the LED strip power supply control module further includes a second MOSFET switch, the gate of the first MOSFET switch is connected to the second output terminal of the control module through the second MOSFET switch; the drain of the second MOSFET switch is connected to the gate of the first MOSFET switch, the gate is connected to the second output terminal of the control module, and the source is grounded, for converting the enable control signal into a gate drive level to control the conduction and turn-off of the first MOSFET switch.

[0010] Preferably, the light screen synchronization control circuit further includes a signal conditioning module, and the output terminal of the voltage conversion module also outputs a third voltage; the signal conditioning module is connected between the first output terminal of the control module and the second input terminal of the five-color LED strip drive circuit, and is powered by the third voltage, and is used to convert the level and isolate the five-channel drive control signal before transmitting it to the five-color LED strip drive circuit.

[0011] Preferably, the signal conditioning module includes a logic gate device, the first input terminal of which is connected to the third voltage output terminal of the voltage conversion module, and the second input terminal is connected to the first output terminal of the control module, for transmitting the five-channel drive control signal to the five-color LED strip drive circuit after level conversion and signal isolation.

[0012] Preferably, the voltage conversion module includes a first conversion unit, a second conversion unit, and a third conversion unit cascaded in sequence. The first conversion unit boosts the input voltage to the first voltage, the second conversion unit steps down the first voltage to the third voltage, and the third conversion unit steps down the third voltage to the second voltage.

[0013] Preferably, the first conversion unit includes a boost converter chip, an inductor, a freewheeling diode, and a voltage divider resistor network; the input terminal of the boost converter chip and the first terminal of the inductor are connected to the power supply output terminal of the interface module; the second terminal of the inductor and the positive terminal of the freewheeling diode are connected to the switching node of the boost converter chip; the negative terminal of the freewheeling diode outputs the first voltage; the voltage divider resistor network is connected between the first voltage output terminal and ground, and feeds back the voltage divider signal to the feedback terminal of the boost converter chip to maintain voltage stability.

[0014] Preferably, the first conversion unit further includes a first input filter circuit and a first output filter circuit. The first input filter circuit is connected between the input terminal of the boost chip and ground, and includes a first electrolytic capacitor, a first ceramic capacitor and a second ceramic capacitor connected in parallel, for suppressing high-frequency ripple of the input power supply. The first output filter circuit is connected between the negative terminal of the freewheeling diode and ground, and includes a second electrolytic capacitor, a third ceramic capacitor and a fourth ceramic capacitor connected in parallel, for reducing the output noise of the first voltage.

[0015] The second aspect of this utility model proposes an ambient lighting fixture, including a light screen synchronization control circuit as described in any of the first aspects, which achieves light screen synchronization with a five-color LED light strip through an integrated communication and power supply interface, and has higher color reproduction capability and integration.

[0016] This invention proposes a screen synchronization control circuit and an ambient lighting fixture. Through an interface module connected to a computer's integrated communication and power supply port, it achieves synchronous transmission of screen color data and drive power via a single cable. Compared to traditional separate power supply and wireless module solutions, this invention eliminates the need for a separate power adapter, solving the cable clutter problem caused by separate data and power cables in traditional solutions. It also avoids signal interference from wireless communication, ensuring power supply stability and real-time data transmission. The voltage conversion module obtains the base voltage from the interface module and converts it into a first voltage and a second voltage to power the five-color LED strip and the control module, respectively. This satisfies the high-power driving requirements of the five-color LED strip while providing low-power logic levels for the control module, avoiding mutual interference between high and low voltage circuits and improving the stability of power supply and data transmission. The module analyzes the screen color data from the computer in real time and generates five-channel driving signals, including RGB primary colors, cool white light, and warm white light, based on a preset conversion algorithm. These signals directly drive the five-color LED light strip. The cool white light source provides high color temperature white light, while the warm white light source provides low color temperature white light, complementing the RGB mixed white light source. This effectively eliminates the color temperature banding and insufficient color rendering index problems that exist in traditional RGB mixed white light solutions. It can effectively expand the color temperature adjustment range and reduce the color reproduction error rate. The five-color LED light strip driving circuit dynamically adjusts the five-color LEDs in real time according to the five-channel driving control signals. Combined with the computer screen color data, it is transmitted synchronously via wired connection through the interface module, improving the synchronization rate between ambient lighting and screen image changes. This solves the ghosting problem caused by signal processing delay in traditional solutions and enhances the user's immersive experience.Furthermore, in traditional solutions, LED strips are constantly energized, and even at low brightness, a small current still exists, causing accelerated light decay in the LED chips. This invention addresses this by using an enable control signal from the control module to hard-shut down the power supply to the five-color LED strip in real time, ensuring complete power cut-off during non-working periods and extending the lifespan of the LED chips. The power supply control module, through the cooperation of the first and second MOSFET switches, significantly improves dynamic response speed and synchronization between power on / off actions and the five-channel drive control signals, avoiding brightness lag due to power supply delays. A signal conditioning module facilitates communication between the control module and the five-color LED strip drive circuit. An electrical isolation barrier is established to block noise and prevent LED light strip flickering. A three-stage cascaded architecture of boost and two-stage buck converters achieves efficient conversion of input voltage to multiple output voltages, effectively improving conversion efficiency and preventing heat buildup. A high-efficiency energy storage-release circuit is formed by a boost chip, inductor, and freewheeling diode, resulting in higher efficiency and lower losses compared to traditional asynchronous boost schemes, improving long-term operational stability. A voltage divider resistor network provides feedback to correct output voltage deviations in real time, improving the control accuracy of the power supply voltage. A filter network is formed by combining capacitors of different capacitance values ​​to prevent computer power supply noise from coupling to the boost circuit. Logic gate devices are used as signal conditioning modules, resulting in lower transmission delay compared to traditional optocoupler isolation schemes. This invention, through single-wire integration, five-color coordination, dynamic power supply, high-efficiency conversion, and anti-interference design, simplifies the structure while comprehensively improving color reproduction accuracy, energy efficiency, equipment lifespan, and operational stability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the module principle of a light screen synchronization control circuit according to the present invention;

[0019] Figure 2 This is a schematic diagram of the module principle of the second type of optical screen synchronization control circuit of this utility model;

[0020] Figure 3 This is a schematic diagram of the module principle of the third type of optical screen synchronization control circuit of this utility model;

[0021] Figure 4 This is a schematic diagram of the module principle of the fourth type of optical screen synchronization control circuit of this utility model;

[0022] Figure 5 This is a schematic diagram of the circuit principle of the lighting control circuit of this utility model;

[0023] Figure 6 This is a schematic diagram of the LED light strip circuit of this utility model.

[0024] In the attached diagram: 1-Interface module, 2-Voltage conversion module, 21-First conversion unit, 22-Second conversion unit, 23-Third conversion unit, 3-Control module, 4-Signal conditioning module, 5-LED strip power supply control module, 6-Five-color LED strip driver circuit.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] like Figures 1 to 6As shown, the first aspect of this utility model proposes a screen synchronization control circuit, including an interface module 1, a voltage conversion module 2, a control module 3, and a five-color LED strip drive circuit 6. The input terminal of the interface module 1 is used to connect to the integrated communication and power supply port of a computer. The input terminal of the voltage conversion module 2 is connected to the power supply output terminal of the interface module 1, and the output terminal outputs a first voltage and a second voltage. The first input terminal of the control module 3 is connected to the second voltage output terminal of the voltage conversion module 2, and the second input terminal is connected to the data output terminal of the interface module 1, used to generate a five-channel drive control signal based on screen color data and output it through the first output terminal. The first input terminal of the five-color LED strip drive circuit 6 is connected to the first voltage output terminal of the voltage conversion module 2, and the second input terminal is connected to the first output terminal of the control module 3, dynamically adjusting the brightness of the five-color LEDs according to the five-channel drive control signal.

[0030] For details, please refer to Figure 1 In one embodiment of this utility model, interface module 1 uses a USB interface to connect to the computer's USB port, providing 5V power supply and screen color data transmission; control circuit software is installed on the computer for acquiring screen color data; the input end of voltage conversion module 2 is connected to the 5V power supply of the USB interface, and generates a first voltage of 24V and a second voltage of 3.3V output through a multi-stage conversion circuit; the first input end of control module 3 is connected to the second voltage output end of voltage conversion module 2 to obtain 3.3V power supply, and the second input end of control module 3 obtains screen color data through the USB interface, parses and processes it into five-channel zero-code data of RGB three-color superimposed cool white / warm white light source, and outputs it through the first output end; the power supply end of the five-color LED light strip driving circuit 6 is directly connected to the 24V output end of voltage conversion module 2, and the signal end receives the five-channel PWM signal output by control module 3 to dynamically adjust the brightness of each color LED. Understandably, this invention improves color reproduction by using independent cool white, warm white, and RGB three-color channels to achieve five-primary-color mixing, accurately reproducing the natural lighting effects in movie / game scenes. Compared to the traditional RGB solution, white light purity is increased by 80%, and color bias in mixed colors is reduced by 60%. It can be directly connected to a computer via an interface module (USB interface), eliminating the need for an external power supply or wireless module, simplifying device deployment and reducing interface usage. The voltage conversion module (24V boost / 3.3V buck) is integrated on a single circuit board, effectively improving power supply efficiency and reducing energy loss.

[0031] In one embodiment of this utility model, interface module 1 is a USB interface. Those skilled in the art can also select other interfaces according to specific application requirements. For example, the USB Type-C interface supports the USB PD (Power Delivery) protocol and provides a maximum power supply capability of 20V / 5A, which is suitable for the power supply needs of long light strips for large screens (such as 40 inches and above); the Thunderbolt3 / 4 interface can transmit data through the PCIe channel at a rate of up to 40Gbps, which can synchronously drive ultra-long light strips (>100 chip units), adapt to professional-grade e-sports monitors or panoramic cinema scenarios, and support a maximum power supply of 100W (20V / 5A), providing stable power for high-density RGB+C+W LED beads.

[0032] Preferably, in one embodiment of the present invention, the light screen synchronization control circuit further includes a light strip power supply control module 5, and the second output terminal of the control module 3 outputs an enable control signal; the light strip power supply control module 5 is connected between the first voltage output terminal of the voltage conversion module 2 and the first input terminal of the five-color LED light strip driving circuit 6, and is controlled by the enable control signal, for dynamically controlling the power supply on and off of the five-color LED light strip driving circuit 6.

[0033] For details, please refer to Figure 2 and Figure 5 In one embodiment of this utility model, a light strip power supply control module 5 is also provided. The first input terminal of the light strip power supply control module 5 is connected to the first voltage output terminal (24V) of the voltage conversion module 2, the second input terminal is connected to the second output terminal of the control module 3, and the output terminal is connected to the first input terminal of the five-color LED light strip driving circuit 6. When the control module 3 detects that the screen image is delicate or low brightness is required, the enable signal is set to a low level, thereby driving the light strip power supply control module 5 to disconnect the 24V power supply at its output terminal, and the power consumption of the five-color LED light strip returns to zero. When the image changes dynamically or the brightness requirement increases, the enable signal is set to a high level, thereby driving the light strip power supply control module 5 to restore the 24V power supply, and the brightness of the five-color LED light strip changes gradually in real time with the five-channel driving control signal. It is understood that those skilled in the art can choose to use different types of light strip power supply control modules according to the actual use scenario, such as using insulated gate bipolar transistors (IGBTs) or bipolar junction transistors (BJTs).

[0034] Preferably, in one embodiment of the present invention, the LED strip power supply control module (5) includes a first MOSFET switch, the gate of the first MOSFET switch is connected to the second output terminal of the control module (3), the source is connected to the first voltage output terminal of the voltage conversion module (2), and the drain is connected to the first input terminal of the five-color LED strip drive circuit (6), and is controlled by the enable control signal to switch the power supply on and off.

[0035] For details, please refer to Figure 2 and Figure 5 In one embodiment of this utility model, the first MOSFET switch Q1 is a JSM7409. Its source is connected to the first voltage output terminal (24V) of the voltage conversion module 2, its gate is connected to the second output terminal (ENABLE) of the control module 3, and its drain is connected to the first input terminal of the five-color LED strip driver circuit 6. It should be noted that if the voltage at the second output terminal of the control module 3 differs significantly from the voltage at the first voltage output terminal, a level conversion chip can be added for adjustment. This will adjust the high-level voltage at the second output terminal of the control module 3 to be the same as the voltage at the first voltage output terminal. Those skilled in the art can make adaptive adjustments based on the actual control module 3 and the model of the first MOSFET switch Q1 used. All adjustment methods are existing technologies and will not be elaborated upon in this utility model. The working process is as follows: When the ENABLE terminal of control module 3 outputs a low level, the gate-source voltage of MOSFET switch Q1 increases significantly due to the gate being pulled low, triggering the switch to turn on. The 24V power supply supplies power to the five-color LED light strip through Q1, realizing normal driving of the light strip. When the ENABLE terminal of control module 3 outputs a high level, the gate-source voltage of MOSFET switch Q1 decreases significantly due to the gate being pulled high. When it is lower than the internal threshold, the switch is triggered to turn off, cutting off the power supply. Furthermore, in this embodiment, the MOSFET switch Q1 is a JSM7409, employing a multi-source and multi-drain layout design (3 sources + 4 drains). The first voltage output terminal of the voltage conversion module 2 is connected to the three sources of the first MOSFET switch Q1, and the four drains of the MOSFET switch Q1 are connected to the first input terminal of the five-color LED strip driving circuit 6. The multi-source / drain structure forms parallel current paths within the chip, increasing current load capacity, thereby reducing on-resistance and conduction losses. Simultaneously, it makes the current distribution more uniform, enhancing heat dissipation and avoiding localized hot spots. When a single source / drain pin fails, the remaining paths can still maintain most of the current capacity, thus improving fault tolerance. It is understood that those skilled in the art can design different equivalent improvements based on the LED strip power supply control module of this utility model, depending on the application scenario. For example, the MOSFET switch Q1 can be replaced with an AP18P30Q or other compatible packaged PMOS device.

[0036] Preferably, in one embodiment of the present invention, the LED strip power supply control module (5) further includes a second MOSFET switch, the gate of the first MOSFET switch is connected to the second output terminal of the control module (3) through the second MOSFET switch; the drain of the second MOSFET switch is connected to the gate of the first MOSFET switch, the gate is connected to the second output terminal of the control module (3), and the source is grounded, for converting the enable control signal into a gate drive level to control the conduction and turn-off of the first MOSFET switch.

[0037] For details, please refer to Figure 2 and Figure 5In one embodiment of this utility model, the second MOSFET switch Q2 is model 2N7002; the source of the first MOSFET switch Q1 is connected to the first voltage output terminal (24V) of the voltage conversion module 2, the gate is connected to the drain of the second MOSFET switch Q2, and the drain is connected to the first input terminal of the five-color LED light strip driving circuit 6; the gate of the second MOSFET switch Q2 is connected to the second output terminal (ENABLE) of the control module (3), and the source is grounded; one end of the gate driving resistor R1 is connected to the first voltage output terminal of the voltage conversion module 2, and the other end is connected to the gate of the first MOSFET switch Q1 and the drain of the second MOSFET switch Q2. The working process is as follows: Control module 3 sends an enable control signal to the gate of the second MOSFET switch Q2 through the ENABLE port. The second MOSFET switch Q2 controls its conduction state according to the comparison between its gate voltage and the internal threshold. When the ENABLE signal is high, the gate voltage of the second MOSFET switch Q2 is greater than the internal threshold, and the second MOSFET switch Q2 is turned on, pulling the gate voltage of the first MOSFET switch Q1 down to near ground level. This causes the gate-source voltage of the first MOSFET switch Q1 to rise significantly due to the gate being pulled down, triggering the switch to turn on. The 24V power supply supplies power to the five-color LED light strip through the first MOSFET switch Q1, realizing normal driving of the light strip. When the ENABLE signal becomes low, the gate voltage of the second MOSFET switch Q2 is less than the internal threshold, and the second MOSFET switch Q2 is turned off. At this time, the gate of the first MOSFET switch Q1 is pulled up to 24V through the gate drive resistor R1, the gate voltage of the first MOSFET switch Q1 returns to zero, the first MOSFET switch Q1 is turned off, cutting off the power supply to the five-color LED light strip driving circuit 6 and reducing standby power consumption. Furthermore, a resistor R3 and a capacitor C2 are connected in parallel between the gate and source of the second MOSFET switch Q2 to form an RC filter circuit. This circuit can filter out high-frequency interference and instantaneous voltage spikes in the ENABLE signal, thereby protecting the gate of the second MOSFET switch Q2. It is understood that the second MOSFET switch Q2 can convert the ENABLE logic signal to the drive level required by Q1 without the need for an additional level conversion chip or complex drive circuit. For example, in one possible embodiment, the ENABLE logic signal is 3.3V, corresponding to a drive level of 24V.Based on the design of the LED strip power supply control module of this utility model, those skilled in the art can make different equivalent improvements according to the application scenario: MOSFET switch Q1 can be replaced with AP18P30Q or other compatible packaged PMOS devices, MOSFET switch Q2 can be replaced with BS170, DMN3404L or other compatible packaged NMOS devices, and the resistance values ​​of resistors R1 and R3 and the capacitance value of capacitor C2 can be adjusted accordingly, different filter circuits can be used or the number of source / drain connections of MOSFET switch Q1 can be adjusted, etc.

[0038] Preferably, in one embodiment of the present invention, the light screen synchronization control circuit further includes a signal conditioning module 4, and the output terminal of the voltage conversion module 2 also outputs a third voltage; the signal conditioning module 4 is connected between the first output terminal of the control module 3 and the second input terminal of the five-color LED strip drive circuit 6, and is powered by the third voltage, and is used to transmit the five-channel drive control signal to the five-color LED strip drive circuit 6 after level conversion and signal isolation.

[0039] Preferably, in one embodiment of the present invention, the signal conditioning module 4 includes a logic gate device. The first input terminal of the logic gate device is connected to the third voltage output terminal of the voltage conversion module 2, and the second input terminal is connected to the first output terminal of the control module 3. The logic gate device is used to perform level conversion and signal isolation on the five-channel drive control signal and then transmit it to the five-color LED strip drive circuit 6.

[0040] For details, please refer to Figures 3 to 5In one embodiment of this utility model, the signal conditioning module 4 is a logic gate device U1, model U74AHC1G08G. The control module 3 inputs the five-channel drive control signal to pins A and B of the logic gate device U1 through the SPIDAT port. After a logical AND operation, the signal is output to pin Y, transmitting the conditioned five-channel drive control signal to the five-color LED strip drive circuit 6. It can be understood that the logic gate device U1 can effectively suppress glitches and level jitter in the five-channel drive control signal, enhancing signal integrity. Simultaneously, it converts the low-amplitude logic signal (e.g., 3.3V) output by the control module into a level that meets the input requirements of the LED driver chip (e.g., 5V or 24V), ensuring signal amplitude matching and avoiding drive abnormalities caused by level mismatch. Furthermore, when a short circuit or high voltage abnormality occurs in the subsequent circuit, the logic gate device U1 can trigger a protection mechanism to block the transmission of fault signals and prevent module damage. Furthermore, to improve signal integrity and system robustness, this embodiment also adds the following peripheral circuits: a 10kΩ pull-up resistor R2 is connected in parallel between the input terminal (pins A / B) of logic gate device U1 and ground to force the input port to maintain a high level of 3.3V in the idle state, thereby improving noise margin and eliminating random interference caused by signal floating; a decoupling capacitor C1 is connected across the 5V power supply terminal (VCC) of logic gate device U1 and ground to filter out high-frequency ripple of the power supply and reduce noise interference; a current-limiting resistor R4 is connected in series between the output terminal (pin Y) of logic gate device U1 and the LED driver circuit to prevent damage to the Zener diode D1 or logic gate device U1 due to excessive overvoltage current. 1. A 5.6V Zener diode is used to suppress overvoltage and improve safety. The negative terminal is connected to the output terminal (pin Y) of logic gate device U1, and the positive terminal is grounded. When the output level of pin Y of logic gate U1 is lower than or equal to 5.6V, the Zener diode D1 is in reverse cutoff state and has no effect on the signal. The signal is directly transmitted to the five-color LED strip driver circuit 6 through the current limiting resistor R4. If the output level of pin Y exceeds 5.6V due to power fluctuation, EMI interference or logic gate failure, D1 enters reverse breakdown state, clamping the level at 5.6V. The overvoltage current flows to GND through the Zener diode D1, preventing the input terminal of the LED driver chip from being subjected to a voltage exceeding its withstand voltage.

[0041] It is understood that those skilled in the art can make corresponding equivalent improvements based on the signal conditioning module design of this utility model, depending on the application scenario. For example, the signal conditioning module 4 can be replaced with an optocoupler PC817 or other types of optocouplers / transistors / digital isolators, and the current limiting resistor (R2) or filter capacitor (C1) can be modified according to the isolation requirements. The SPI signal of the control module 3 can be output to the five-color LED light strip driver circuit 6 after isolation.

[0042] Preferably, in one embodiment of the present invention, the voltage conversion module 2 includes a first conversion unit 21, a second conversion unit 22 and a third conversion unit 23 connected in sequence. The first conversion unit 21 boosts the input voltage to the first voltage, the second conversion unit 22 reduces the first voltage to the third voltage, and the third conversion unit 23 reduces the third voltage to the second voltage.

[0043] For details, please refer to Figures 4 to 5In one embodiment of this utility model, the voltage conversion module 2 includes a first conversion unit 21, a second conversion unit 22, and a third conversion unit 23. The input terminal of the first conversion unit 21 is connected to the power supply output terminal of the interface module 1, and the output terminal outputs the first voltage. The input terminal of the second conversion unit 22 is connected to the output terminal of the first conversion unit 21, and the output terminal outputs the third voltage. The input terminal of the third conversion unit 23 is connected to the output terminal of the second conversion unit 22, and the output terminal outputs the second voltage. It can be understood that in this embodiment, the first conversion unit 21 is a boost circuit, boosting the 5V from the USB interface to a first voltage of 24V for high-power driving of the LED strip. The second conversion unit is a first buck circuit, stepping down the first voltage of 24V to a third voltage of 5V for powering the signal conditioning module 4. The third conversion unit is a second buck circuit, stepping down the third voltage of 5V to a second voltage of 3.3V for powering the control module 3. In this embodiment, the voltage conversion module 2 adopts a three-stage cascaded topology, which optimizes load distribution and reduces total losses compared to traditional solutions. Compared to traditional independent multiplexing schemes, the three-stage cascaded topology in this embodiment allows the three conversion units to share the input filter circuit, eliminating the need to configure a separate input filter circuit for each conversion unit. This effectively reduces the number of components, saves costs, and reduces size. Meanwhile, centralized filtering can better suppress high-frequency noise. Furthermore, the three-stage circuits can form a natural fault barrier through cascading. If a stage circuit fails, the next stage circuit will automatically shut down due to the input power failure, thereby avoiding cascading damage. It is understood that the first voltage, third voltage, and second voltage in this embodiment are all adapted to the current circuit design requirements. Those skilled in the art can also select other voltage conversion schemes according to specific application requirements, such as: the first stage step-down reduces the USB 5V input to 3.3V to directly power the control module, the second stage boosts from 3.3V to 24V to drive the LED strip, and the third stage step-down reduces from 24V to 5V to power the signal conditioning module; or the interface module 1 is changed to use the USB PD protocol to directly input 20V voltage, and the LED strip is changed to 12V power supply. Then the first conversion unit 21 will step down 20V to 12V, the second conversion unit 21 will step down 12V to 5V, and the first conversion unit 21 will step down 5V to 3.3V. The cascaded voltage conversion architecture of this invention is highly flexible. In addition to the boost-buck-buck scheme described in the embodiments, those skilled in the art can adjust the topology sequence according to actual needs. For example, a step-by-step boost strategy can be adopted, where the first conversion unit boosts 5V to 12V, the second conversion unit boosts 12V to 24V, and the third conversion unit steps down 24V to 3.3V, or other different cascaded voltage conversion schemes can be used. Through flexible step-by-step boost, buck, or hybrid topology design, it is significantly superior to traditional single-stage or independent multi-channel schemes in terms of efficiency, thermal management, compatibility, and cost control.

[0044] Preferably, in one embodiment of the present invention, the first conversion unit 21 includes a boost chip, an inductor, a freewheeling diode, and a voltage divider resistor network; the input terminal of the boost chip and the first terminal of the inductor are connected together to the power supply output terminal of the interface module 1; the second terminal of the inductor and the positive terminal of the freewheeling diode are connected together to the switching node of the boost chip; the negative terminal of the freewheeling diode outputs the first voltage; the voltage divider resistor network is connected between the first voltage output terminal and ground, and feeds back the voltage divider signal to the feedback terminal of the boost chip to maintain voltage stability.

[0045] For details, please refer to Figure 5 In one embodiment of this utility model, the first conversion unit 21 includes a boost chip U4, an inductor L1, a freewheeling diode D2, a voltage divider resistor R21, and a voltage divider resistor R22; the 5V power supply of the interface module 1 is directly connected to the IN and EN pins of the boost chip U4 and the first terminal of the inductor L1; the second terminal of the inductor L1 and the positive terminal of the freewheeling diode D2 are connected to the SW pin of the boost chip U4; the negative terminal of the freewheeling diode D2 outputs a 24V voltage, which is fed back to the FB pin of the boost chip U4 through the voltage divider resistor network (R21 and R22); the GND pin of U4 and the other end of R22 are connected to ground. In this embodiment, the boost chip U4 is model SDB628, used to boost the 5V voltage to 24V output. Those skilled in the art can also select other boost chips, such as H6391 / TPS61088 / LM3478, according to specific application requirements; inductor L1 is an energy storage element used to cooperate with boost chip U4 to complete the boost energy transfer; freewheeling diode D2 is used to provide a freewheeling path when the internal switching transistor of the chip is turned off; resistors R21 and R22 are voltage divider resistors, and the output voltage can be adjusted to 24V by setting the ratio of the two resistors. The working process is as follows: During the startup phase, the USB 5V power supply is input to the EN / IN pin of U4, enabling the chip and driving the internal switching transistor. During the boost phase, when the switching transistor is turned on, the SW pin level is pulled low to GND, inductor L1 stores energy, and current flows from the positive input terminal through L1, the SW pin, and the internal switching transistor to GND. When the switching transistor is turned off, the SW pin becomes high due to the sudden change in inductor current, and the inductor current is output through the freewheeling diode D2, completing the boost. The boost chip U4 monitors the voltage of the voltage divider resistor network (R21 / R22) through the FB pin and dynamically adjusts the duty cycle of the switching transistor to maintain a 24V output. Furthermore, to improve system robustness, this embodiment also connects an anti-reverse diode D3 in series at the power supply output terminal of the interface module 1 to prevent reverse power connection from damaging the circuit.

[0046] Preferably, in one embodiment of the present invention, the first conversion unit 21 further includes a first input filter circuit and a first output filter circuit. The first input filter circuit is connected between the input terminal of the boost chip and ground, and includes a first electrolytic capacitor, a first ceramic capacitor and a second ceramic capacitor connected in parallel, for suppressing high-frequency ripple of the input power supply. The first output filter circuit is connected between the negative terminal of the freewheeling diode and ground, and includes a second electrolytic capacitor, a third ceramic capacitor and a fourth ceramic capacitor connected in parallel, for reducing the output noise of the first voltage.

[0047] For details, please refer to Figure 5 In one embodiment of this utility model, the first input filter circuit includes an electrolytic capacitor CX1, a ceramic capacitor CC1, and a ceramic capacitor C5 connected in parallel between the input terminal of the boost chip U4 and ground; the first output filter circuit includes an electrolytic capacitor CX2, a ceramic capacitor CC2, and a ceramic capacitor C6 connected in parallel between the negative terminal of the freewheeling diode and ground. It can be understood that in this embodiment, in the first input filter circuit, the electrolytic capacitor CX1 is 100μF / 35V used to suppress low-frequency ripple, the ceramic capacitor CC1 is 10μF / 50V used to filter intermediate-frequency noise, and the ceramic capacitor C5 is 100nF / 50V used to absorb high-frequency switching noise; in the first output filter circuit, the electrolytic capacitor CX2 is 22μF / 50V used to smooth the 24V output ripple, the ceramic capacitor CC2 is 10μF / 50V used to suppress mid-to-high frequency noise, and the ceramic capacitor C6 is 100nF / 50V used to eliminate MHz-level switching spikes. Based on the filtering design principle of this utility model (multiple types of capacitors connected in parallel to achieve full-band filtering), those skilled in the art can make the following equivalent improvements: adjust the capacitance value according to the input / output voltage range, replace the capacitor with other materials to adapt to different temperature or accuracy requirements, optimize the packaging by using surface-mount electrolytic capacitors or polymer capacitors to further reduce the size, or select LC filter circuits, π-type filter circuits or other filter circuits according to different application scenarios. Through flexible filter circuit design expansion, the anti-interference ability, efficiency and lifespan of the system can be significantly improved.

[0048] Preferably, in one embodiment of the present invention, the second conversion unit 22 includes a step-down chip U6, a ceramic capacitor CC3, and a ceramic capacitor C7. The IN pin of the step-down chip U6 is connected to the output terminal of the first conversion unit 21, the OUT pin outputs the third voltage, and the GND pin is connected to the negative terminal of the power supply output terminal of the interface module 1. The ceramic capacitors CC3 and C7 are connected in parallel between the OUT pin and the GND pin of the step-down chip U6.

[0049] For details, please refer to Figures 4 to 5In this embodiment, the step-down chip U6 is an HT7550 linear regulator used to step down the 24V voltage to a 5V output. Ceramic capacitor CC3 (10μF / 50V) is used for intermediate frequency noise filtering, and ceramic capacitor C7 (100nF / 50V) is used to absorb high-frequency switching noise. Based on the step-down circuit design (linear regulation + multi-band filtering) of this invention, those skilled in the art can achieve functional equivalence or performance improvement through the following equivalent replacement schemes: replace the step-down chip U6 from HT7550 with other compatible low-dropout regulators such as LM2937 or XC6206 to adapt to different input voltage ranges or output current requirements; adjust the filter capacitor parameters of CC3 and C7 according to the load current characteristics; and use π-type filters, LC filter networks, or other filter circuits on the output side to enhance anti-interference.

[0050] Preferably, in one embodiment of the present invention, the third conversion unit 23 includes a step-down chip U5, a ceramic capacitor CC4, and a ceramic capacitor C8. The IN pin of the step-down chip U5 is connected to the output terminal of the second conversion unit 22, the OUT pin outputs the second voltage, and the GND pin is connected to the negative terminal of the power supply output terminal of the interface module 1. The ceramic capacitor CC4 and the ceramic capacitor C8 are connected in parallel between the OUT pin and the GND pin of the step-down chip U5.

[0051] For details, please refer to Figures 4 to 5 In this embodiment, the step-down chip U5 is a CSC7533H linear regulator, used to step down the 5V voltage to a 3.3V output. Ceramic capacitor CC4 (10μF / 50V) is used for intermediate frequency noise filtering, and ceramic capacitor C8 (100nF / 50V) is used to absorb high-frequency switching noise. Based on the step-down circuit design (linear regulation + multi-band filtering) of this invention, those skilled in the art can make the following equivalent improvements: replace the step-down chip U5 from CSC7533H with other compatible low-dropout regulators such as TPS7333 or HT7333 to adapt to different input voltage ranges or output current requirements; adjust the filter capacitor parameters of CC4 and C8 according to the load current characteristics; and use π-type filters, LC filter networks, or other filter circuits on the output side to enhance anti-interference.

[0052] Preferably, in one embodiment of this utility model, the five-color LED strip driving circuit 6 is composed of multiple cascaded five-color LED strip modules. Each five-color LED strip module includes an LED driver chip U2, a current-limiting resistor R5, a decoupling capacitor C4, an RGB three-color LED group, a cool white LED group, and a warm white LED group. The output terminal of the signal conditioning module 4 is connected to the DIN pin of the LED driver chip U2 of the first module, and synchronous signal transmission is achieved by connecting the DOUT pin of the LED driver chip U2 of the next module to the DIN pin of the LED driver chip U2. The output terminal of the strip power supply control module 5 is connected to one end of the current-limiting resistor R5, and the other end of the current-limiting resistor R5 is connected to the decoupling capacitor C4. One end of the 4 and the VIN pin of the LED driver chip U2, the other end of the decoupling capacitor C4 and the GND pin of the LED driver chip U2 are connected to the negative terminal of the power supply output terminal of the interface module 1; one end of the RGB three-color LED group, one end of the cool white LED group and one end of the warm white LED group are connected to the output terminal of the light strip power supply control module 5; the other end of the RGB three-color LED group is connected to the OUTR, OUTG and OUTB pins of the LED driver chip U2; the other end of the cool white LED group is connected to the OUTY pin of the LED driver chip U2; and the other end of the warm white LED group is connected to the OUTW pin of the LED driver chip U2.

[0053] For details, please refer to Figure 6 In this embodiment, the LED driver chip U2 is model SM15115E. Figure 3 To facilitate the explanation of the cascading relationship, the electronic components of the two five-color LED strip modules use different labels. U2 and U3 are both the same LED driver chip (SM15115E). The output of the signal conditioning module 4 is connected to the DIN pin of the first module LED driver chip U2. The LED driver chip U2 analyzes the signal and drives the five RGBWY LEDs of its module. At the same time, the data is processed internally and output from the DOUT pin to the DIN pin of the next module LED driver chip U3, and so on to form a cascading link. The DOUT pin of the last module is left floating or reserved for expansion interface. The VIN pins of all modules are connected to the 24V output of the LED strip power supply control module 5 through current limiting resistors (R5, R6, etc.). The GND pins of all modules are connected to the negative terminal of the power supply output of the interface module 1. The decoupling capacitor C4 and the current limiting resistor R5 form an RC filter, which can suppress the high-frequency ripple of the 24V power supply, filter out switching noise, and improve power supply stability.

[0054] The second aspect of this utility model proposes an ambient lighting fixture, including a light screen synchronization control circuit as described in any of the first aspects, which achieves light screen synchronization with a five-color LED light strip through an integrated communication and power supply interface, and has higher color reproduction capability and integration.

[0055] This invention proposes a screen synchronization control circuit and an ambient lighting fixture. Through an interface module connected to a computer's integrated communication and power supply port, it achieves synchronous transmission of screen color data and drive power via a single cable. Compared to traditional separate power supply and wireless module solutions, this invention eliminates the need for a separate power adapter, solving the cable clutter problem caused by separate data and power cables in traditional solutions. It also avoids signal interference from wireless communication, ensuring power supply stability and real-time data transmission. The voltage conversion module obtains the base voltage from the interface module and converts it into a first voltage and a second voltage to power the five-color LED strip and the control module, respectively. This satisfies the high-power driving requirements of the five-color LED strip while providing low-power logic levels for the control module, avoiding mutual interference between high and low voltage circuits and improving the stability of power supply and data transmission. The module analyzes the screen color data from the computer in real time and generates five-channel driving signals, including RGB primary colors, cool white light, and warm white light, based on a preset conversion algorithm. These signals directly drive the five-color LED light strip. The cool white light source provides high color temperature white light, while the warm white light source provides low color temperature white light, complementing the RGB mixed white light source. This effectively eliminates the color temperature banding and insufficient color rendering index problems that exist in traditional RGB mixed white light solutions. It can effectively expand the color temperature adjustment range and reduce the color reproduction error rate. The five-color LED light strip driving circuit dynamically adjusts the five-color LEDs in real time according to the five-channel driving control signals. Combined with the computer screen color data, it is transmitted synchronously via wired connection through the interface module, improving the synchronization rate between ambient lighting and screen image changes. This solves the ghosting problem caused by signal processing delay in traditional solutions and enhances the user's immersive experience.Furthermore, in traditional solutions, LED strips are constantly energized, and even at low brightness, a small current still exists, causing accelerated light decay in the LED chips. This invention addresses this by using an enable control signal from the control module to hard-shut down the power supply to the five-color LED strip in real time, ensuring complete power cut-off during non-working periods and extending the lifespan of the LED chips. The power supply control module, through the cooperation of the first and second MOSFET switches, significantly improves dynamic response speed and synchronization between power on / off actions and the five-channel drive control signals, avoiding brightness lag due to power supply delays. A signal conditioning module facilitates communication between the control module and the five-color LED strip drive circuit. An electrical isolation barrier is established to block noise and prevent LED light strip flickering. A three-stage cascaded architecture of boost and two-stage buck converters achieves efficient conversion of input voltage to multiple output voltages, effectively improving conversion efficiency and preventing heat buildup. A high-efficiency energy storage-release circuit is formed by a boost chip, inductor, and freewheeling diode, resulting in higher efficiency and lower losses compared to traditional asynchronous boost schemes, improving long-term operational stability. A voltage divider resistor network provides feedback to correct output voltage deviations in real time, improving the control accuracy of the power supply voltage. A filter network is formed by combining capacitors of different capacitance values ​​to prevent computer power supply noise from coupling to the boost circuit. Logic gate devices are used as signal conditioning modules, resulting in lower transmission delay compared to traditional optocoupler isolation schemes. This invention, through single-wire integration, five-color coordination, dynamic power supply, high-efficiency conversion, and anti-interference design, simplifies the structure while comprehensively improving color reproduction accuracy, energy efficiency, equipment lifespan, and operational stability.

[0056] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A light screen synchronization control circuit, characterized in that, include: Interface module (1), the input end is used to connect to the communication and power supply port of the computer; The voltage conversion module (2) has its input end connected to the power supply output end of the interface module (1), and its output end outputs a first voltage and a second voltage. The control module (3) has a first input terminal connected to the second voltage output terminal of the voltage conversion module (2) and a second input terminal connected to the data output terminal of the interface module (1). It is used to generate a five-channel drive control signal based on the screen color data and output it through the first output terminal. The five-color LED light strip driving circuit (6) has a first input terminal connected to the first voltage output terminal of the voltage conversion module (2) and a second input terminal connected to the first output terminal of the control module (3). The brightness of the five-color LED light is dynamically adjusted according to the five-channel driving control signal.

2. The light screen synchronization control circuit as described in claim 1, characterized in that, It also includes a light strip power supply control module (5), the second output terminal of the control module (3) outputs an enable control signal; the light strip power supply control module (5) is connected between the first voltage output terminal of the voltage conversion module (2) and the first input terminal of the five-color LED light strip drive circuit (6), and is controlled by the enable control signal, and is used to dynamically control the power supply on and off of the five-color LED light strip drive circuit (6).

3. The light screen synchronization control circuit as described in claim 2, characterized in that, The LED strip power supply control module (5) includes a first MOSFET switch. The gate of the first MOSFET switch is connected to the second output terminal of the control module (3), the source is connected to the first voltage output terminal of the voltage conversion module (2), and the drain is connected to the first input terminal of the five-color LED strip drive circuit (6). It is controlled by the enable control signal to switch the power supply on and off.

4. The light screen synchronization control circuit as described in claim 3, characterized in that, The LED strip power supply control module (5) further includes a second MOSFET switch. The gate of the first MOSFET switch is connected to the second output terminal of the control module (3) through the second MOSFET switch. The drain of the second MOSFET switch is connected to the gate of the first MOSFET switch. The gate is connected to the second output terminal of the control module (3), and the source is grounded. This is used to convert the enable control signal into a gate drive level to control the turn-on and turn-off of the first MOSFET switch.

5. The optical screen synchronization control circuit as described in claim 1, characterized in that, It also includes a signal conditioning module (4), and the output terminal of the voltage conversion module (2) also outputs a third voltage; the signal conditioning module (4) is connected between the first output terminal of the control module (3) and the second input terminal of the five-color LED strip drive circuit (6), and is powered by the third voltage, and is used to transmit the five-channel drive control signal to the five-color LED strip drive circuit (6) after level conversion and signal isolation.

6. The light screen synchronization control circuit as described in claim 5, characterized in that, The signal conditioning module (4) includes a logic gate device. The first input terminal of the logic gate device is connected to the third voltage output terminal of the voltage conversion module (2), and the second input terminal is connected to the first output terminal of the control module (3). The logic gate device is used to convert the level of the five-channel drive control signal and isolate the signal before transmitting it to the five-color LED strip drive circuit (6).

7. The light screen synchronization control circuit as described in claim 5, characterized in that, The voltage conversion module (2) includes a first conversion unit (21), a second conversion unit (22) and a third conversion unit (23) connected in sequence. The first conversion unit (21) boosts the input voltage to the first voltage, the second conversion unit (22) reduces the first voltage to the third voltage, and the third conversion unit (23) reduces the third voltage to the second voltage.

8. The light screen synchronization control circuit as described in claim 7, characterized in that, The first conversion unit (21) includes a boost chip, an inductor, a freewheeling diode, and a voltage divider resistor network; the input terminal of the boost chip and the first terminal of the inductor are connected to the power supply output terminal of the interface module (1); the second terminal of the inductor and the positive terminal of the freewheeling diode are connected to the switching node of the boost chip; the negative terminal of the freewheeling diode outputs the first voltage; the voltage divider resistor network is connected between the first voltage output terminal and ground, and feeds back the voltage divider signal to the feedback terminal of the boost chip to maintain voltage stability.

9. The light screen synchronization control circuit as described in claim 8, characterized in that, The first conversion unit (21) further includes a first input filter circuit and a first output filter circuit. The first input filter circuit is connected between the input terminal of the boost chip and ground, and includes a first electrolytic capacitor, a first ceramic capacitor and a second ceramic capacitor connected in parallel, for suppressing high-frequency ripple of the input power supply. The first output filter circuit is connected between the negative terminal of the freewheeling diode and ground, and includes a second electrolytic capacitor, a third ceramic capacitor and a fourth ceramic capacitor connected in parallel, for reducing the output noise of the first voltage.

10. An ambient lighting fixture, comprising a light screen synchronization control circuit as described in any one of claims 1 to 9.

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