An enhanced carrier control lamp and control method adapted for pulse width encoded dimming systems

Abstract

This invention discloses an enhanced carrier control lamp and control method adapted to a pulse width coding dimming system, belonging to the field of LED lighting control technology. It includes an enhanced pulse width coding main control driver (2) and several parallel enhanced pulse width coding carrier control lamp modules (4), which are connected by a 48V DC bus (3). The main control driver (2) includes a stepped power supply circuit (21), a pulse width coding signal processing circuit (22), an enhanced carrier modulation circuit (23), a back EMF absorption circuit (24), a short circuit protection circuit (25), an enable signal processing circuit (26), and a first single-chip microcomputer control module (27). The lamp module (4) includes an anti-backflow filter (41), a lamp end linear voltage regulated power supply circuit (42), a pulse width coding signal enhancement extraction circuit (43), a decoding control unit (44), an enhanced LED constant current drive circuit (45), a peak clipping circuit (46), and a dual-color lamp board (47). This invention fully retains the software control logic of the multi-lamp consistent dimming system with time pulse width encoding superimposed on the DC bus, achieves full-link hardware optimization, and adds functions such as ±5V negative voltage power supply, multiple protections, current amplification drive, and signal enhancement. It solves the problems of poor stability, low accuracy, and weak load capacity of the original system, is seamlessly compatible with the original system, can be directly replaced, has a multi-lamp brightness / color temperature consistency error of ≤3%, can support ≥300 units, has a power supply distance of ≥150 meters, and is suitable for complex lighting scenarios such as agriculture, animal husbandry, industry, outdoor, and tunnels.

Description

Technical Field

[0001] This invention relates to the field of LED lighting control technology, specifically to an enhanced carrier-controlled lamp and control method adapted to a pulse width encoded dimming system. It is suitable for 48V DC microgrid lighting scenarios and can be directly adapted to a multi-lamp consistent dimming system with time pulse width encoding superimposed on the DC bus, realizing hardware enhancement and functional upgrade. Background Technology

[0002] Multi-lamp consistent dimming systems with time-width encoding superimposed on the DC bus have become an important solution in the low-voltage DC lighting field. This system achieves unified dimming of multiple lamps by superimposing time-width encoded signals on the DC bus, integrating power supply and control, and solving the problems of complex wiring and asynchronous response of multiple lamps in traditional dimming systems. However, in industrial applications, the hardware circuits of the main control unit and subordinate lamp modules of this system have obvious shortcomings: there is no dedicated circuit protection architecture, making it susceptible to damage to components due to extreme conditions such as short circuits, back EMF, and voltage spikes; the signal processing circuit only uses a single positive voltage power supply, making it susceptible to bus ripple interference, resulting in errors in the parsing of the pulse-width encoded signal; the carrier modulation circuit has weak load capacity and cannot adapt to large-scale parallel lamp connections; the lamp-end signal extraction circuit is based on a basic architecture with poor shaping effect, and decoding failure is prone to occur when the bus voltage fluctuates; the LED driver circuit lacks collaborative control logic with pulse-width encoding and decoding, resulting in insufficient compatibility with dual-color light sources.

[0003] In existing technologies, hardware improvements for carrier-based dimming are mostly single-function optimizations, such as isolated short-circuit protection or signal filtering. These improvements lack a comprehensive hardware enhancement solution and are not fully compatible with the software control logic and communication protocols of multi-lamp consistent dimming systems with time-width encoding superimposed on the DC bus. Upgrades require modifications to the original software program, resulting in high industrialization costs. Therefore, there is an urgent need for an enhanced carrier-based control lamp that can seamlessly adapt to this pulse-width encoded dimming system. This lamp should retain the original software control logic while achieving comprehensive hardware circuit optimization, thereby improving system stability, signal processing accuracy, and load capacity. Summary of the Invention Purpose of the invention

[0004] The purpose of this invention is to provide an enhanced carrier-controlled lamp and control method adapted to a pulse width encoded dimming system. While fully retaining the core software control logic, communication protocol, and synchronization frame mechanism of a multi-lamp consistent dimming system with time pulse width encoding superimposed on the DC bus, the invention optimizes the entire hardware circuit design of the system's main control unit and subordinate lamp modules. It adds multiple protection features, negative voltage power supply, signal enhancement, and current amplification drive functions, solving problems such as poor hardware stability, low signal resolution accuracy, and weak load capacity in the original system. Furthermore, it is seamlessly compatible with the original system, allowing direct replacement of existing hardware modules without software modifications, thus reducing industrial upgrading costs. Technical solution

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an enhanced carrier control lamp adapted to a pulse width coding dimming system, comprising an enhanced pulse width coding master driver (2, see Figure 2) and several parallel enhanced pulse width coding carrier control lamp modules (4, see Figure 4), which are connected by a 48V DC bus (3, see Figure 1). The enhanced pulse width coding master driver (2) superimposes a dimming control signal conforming to the time pulse width coding rule on the DC bus (3), and the enhanced pulse width coding carrier control lamp module (4) extracts and decodes the dimming control signal from the DC bus (3) to achieve consistent dimming and color adjustment for multiple lamps.

[0006] The enhanced pulse width encoding master driver (2) includes a stepped power supply circuit (21, see Figure 3), a pulse width encoding signal processing circuit (22, see Figure 2), an enhanced carrier modulation circuit (23, see Figure 2), and a back EMF absorption circuit (24, see Figure 3). Figure 2 The circuit includes a short-circuit protection circuit (25, see Figure 2), an enable signal processing circuit (26, see Figure 2), and a first microcontroller control module (27, see Figure 2). 1. Stepped power supply circuit (21): It provides three power supplies: 12V, 5V, and -5V. The 12V generation circuit consists of a BUCK step-down chip (U1), an enable pull-up resistor (R1), an energy storage device (L3), a freewheeling Schottky diode (D10), an anti-reverse diode (D3), a feedback resistor (R19 / R32), and a filter capacitor (E6). The 5V generation circuit consists of an LDO voltage regulator chip (U4) and a filter capacitor (E7). The -5V generation circuit consists of a negative charge pump (U12), an anti-surge resistor (R87), a filter capacitor (E10), and a flying capacitor (C40). Among them, -5V and 12V power the operational amplifier and comparator to solve the signal interference problem, and 5V is provided to the first microcontroller. 2. Pulse Width Encoding Signal Processing Circuit (22): It consists of two circuits: a brightness input processing circuit composed of a differential amplifier circuit and a low-pass filter attenuator. The differential amplifier circuit is 1x, consisting of an operational amplifier (U10) powered by -5V and 12V power supplies and four feedback resistors (R71 / R73 / R78 / R81) with the same resistance value. The low-pass filter signal attenuation circuit consists of two voltage divider resistors (R77 / R79) and a filter capacitor (C56), with a cutoff frequency of 1Hz. The color signal processing circuit consists of a Zener diode (D18), a filter capacitor (C47), a current-limiting resistor (R67), a pull-up resistor (R29), a pull-down resistor (R55), and an NPN transistor (Q13). It is used to detect the on / off state of the external 12V color channel switch signal. The Zener diode (D18) provides a threshold voltage detection function, and the pull-down resistor (R55) provides a threshold current, ensuring that the input current and voltage reach specified values ​​before activation. The circuit also includes the pull-up resistor (R29) and the NPN transistor (Q13). 3. Enhanced carrier modulation circuit (23): The half-bridge driver chip (U8) provides complementary drive signals and enable functions. It consists of an upper bridge arm MOS transistor (Q9), a discharge resistor (R57), and a freewheeling capacitor (C34) to prevent short circuits in the upper and lower bridge arms in case of abnormality. The two lower bridge arms are composed of two NMOS transistors (Q10 / Q4) connected in parallel to amplify the current, as well as the auxiliary diodes (D22 / D26 / D29), current limiting resistors (R70 / R80 / R33), pull-down resistors (R83 / R75 / R86), and diodes (D21) and capacitors (C50) of the upper bridge arm power supply bootstrap circuit of the half-bridge driver. 4. Back EMF Absorption Circuit (24): The back EMF absorption circuit (24) is composed of a fast recovery diode (D20) and a large-capacity electrolytic capacitor (E3), which quickly absorbs the reverse electromotive force and prevents the MOS transistors (Q10 / Q4 / Q9) from being over-voltaged and broken down. 5. Short-circuit protection circuit (25): The short-circuit protection circuit (25) includes a differential amplifier composed of an alloy short-circuit sampling resistor (R62), an operational amplifier (U9's A), and feedback resistors (R63 / R69 / R84 / R85). It also includes a reference circuit composed of voltage divider resistors (R64 / R65) and a filter capacitor (C35), and a comparator composed of an operational amplifier (U9's B). A low-pass filter composed of resistors (R82) and capacitors (C37) is also included. The sampling resistor (R62) collects the fault voltage, which is amplified 75 times by the differential amplifier and then compared with the reference voltage through the low-pass filter to output a short-circuit fault signal. 6. Enable signal processing circuit (26): It consists of fault signal voltage divider resistor (R68 / R58), enable signal generating diode (D23), and limiting diode (D27). After receiving the short circuit fault signal, it first controls the enhanced carrier modulation circuit (23) to shut down the output. At the same time, the first microcontroller control module (27) shuts down the output after receiving the short circuit fault signal, thus realizing short circuit locking. 7. First microcontroller control module (27): Composed of microcontroller (U13), it completely reuses the software control logic of the original pulse width coding dimming system, including timing coding, signal modulation, and synchronization frame calibration, without any modifications, only adding a hardware fault detection interface.

[0007] The enhanced pulse width encoded carrier control lamp module (4) includes an anti-backflow filter (41, see Figure 4), a linear voltage regulator power supply circuit for the lamp end (42, see Figure 4), a pulse width encoded signal enhancement and extraction circuit (43, see Figure 4), and a decoding control unit (44, see Figure 4). Figure 4 ), Enhanced LED constant current drive circuit (45, see Figure 4), Peak clipping circuit (46, see Figure 4), Dual-color LED board (47, see Figure 4) Figure 4 ): 1. Anti-reverse filter (41): Composed of anti-reverse diode (D2) and filter capacitor (C4), it realizes power supply anti-reverse and bus ripple filtering; 2. Linear regulated power supply circuit (42) at the lamp end: It consists of voltage divider resistor (R3), NPN transistor (Q2), Zener diode (D28), current limiting resistor (R7), and filter capacitor (C2). It steps down the 48V input to output a stable 5V, which is provided to the decoding control unit (44) and the enhanced LED constant current drive circuit (45). The voltage divider resistor is used to distribute power consumption and reduce the power consumption of the transistor. 3. Pulse width encoding signal enhancement and extraction circuit (43): It consists of voltage divider resistors (R12 / R2), limiting diodes (D7), and filter capacitors (C1). It separates the DC component from the pulse width signal, and outputs a standard logic level after limiting, filtering, and shaping, thereby improving the signal's anti-interference capability. 4. Decoding control unit (44): Composed of a high-performance 32-bit MCU (U6), it fully reuses the decoding logic of the original system. It analyzes the brightness / color channel parameters through edge sampling and time measurement, receives the synchronization frame signal for clock reset calibration, ensures the consistency of the time base of multiple lamps, and outputs a 16-bit high-resolution PWM signal and color signal to achieve seamless coordination between decoding parameters and light source drive. 5. Enhanced LED Constant Current Drive Circuit (45): Composed of a constant current drive circuit and a dual-color switching circuit. The constant current drive circuit consists of a constant current drive chip (U2), pull-down resistors (R5 / R14 / R13), NMOS transistors (Q1 / Q3), freewheeling Schottky diodes (D4 / D3), and energy storage inductors (L1 / L2). The dual-color switching circuit consists of a single-pole double-throw chip (U5). The constant current drive chip (U2) outputs a precise constant current based on the brightness parameters and integrates overcurrent and overtemperature protection. The dual-color switching circuit achieves dual-color switching based on the color signal. 6. Peak clipping circuit (46): It consists of current limiting resistor (R11), filter capacitor (C5), discharge resistor (R1), and fast recovery diode (D1 / D6). This circuit mainly works at low brightness to absorb the impact of the spike generated when the circuit is switched on the LED beads at low brightness, so as to ensure that the LED beads can be lit from extremely weak brightness. 7. Dual-color LED board (47): It consists of two LEDs of different colors connected in series (D8 / D9 / D11 / D12 / D13 / D14 / D15 / D16 / D17 / D19 / D24 / D25). The specific number of LEDs connected in series will be adjusted according to the shape of the LED board, and the voltage connected in series is also related to the required power.

[0008] This invention also discloses a control method for an enhanced carrier-controlled lamp adapted to a pulse width encoded dimming system, comprising the following steps: S1, a 48V power supply (1, see Figure 1) powers the enhanced pulse width encoded master driver (2, see Figure 2) and all enhanced pulse width encoded carrier control lamp modules (4, see Figure 4). A stepped power supply circuit (21, see Figure 3) converts the 48V to ±5V and 12V stable voltages. An internal linear voltage regulator circuit (42, see Figure 4) further supplies power to the lamps. Figure 4 The 48V is converted to a stable 5V voltage, which then powers each of the hardware modules. S2, the pulse width encoding master driver (2)’s pulse width encoding signal processing circuit (22, see Figure 2) receives external 0-10V luminance analog signal and color channel switch signal, and transmits them to the first microcontroller control module (27, see Figure 2) after differential amplification and low-pass filtering. S3. The first microcontroller control module (27) generates a pulse width encoded signal carrying luminance, color channel parameters and synchronization frame according to the time pulse width encoding rule, and transmits it to the enhanced carrier modulation circuit (23, see Figure 2). S4, Enhanced carrier modulation circuit (23) superimposes pulse width encoded signal onto 48V DC bus (3, see Figure 1) to form composite voltage waveform, back electromotive force absorption circuit (24, see Figure 2) absorbs back electromotive force in real time, short circuit protection circuit (25, see Figure 2) detects short circuit faults of bus and circuit in real time through sampling resistor (R62); S5. Each enhanced pulse width encoded carrier control lamp module (4) receives the bus composite voltage through the anti-reverse filter (41, see Figure 4), extracts it through the pulse width encoded signal enhancement extraction circuit (43, see Figure 4), limits it through the limiting diode (D7), and low-pass filters it, and outputs a standard logic level pulse width encoded signal to the decoding control unit (44, see Figure 4). S6, the decoding control unit (44) performs edge sampling, time measurement and duty cycle calculation on the pulse width encoded signal, analyzes the brightness and color channel control parameters, receives the synchronization frame signal to perform clock reset calibration, and ensures that the time base of all modules (4) is consistent. S7, Enhanced LED constant current drive circuit (45, see Figure 4) outputs constant current drive signal according to the analyzed brightness parameters, controls the dual-color control chip (U5) according to the color channel parameters to realize color temperature switching, and drives the dual-color lamp board (47, see Figure 4) to realize brightness and color adjustment; S8, the peak clipping circuit (46, see Figure 4) works at low brightness, absorbing the impact of the spikes generated when the circuit switches on the LED beads at low brightness in real time, ensuring that the LED beads can be lit from extremely low brightness. S9. The enhanced pulse width coding master driver (2) periodically sends a synchronization frame signal, and each enhanced pulse width coding carrier control lamp module (4) synchronously resets and calibrates to maintain the consistency of multi-lamp dimming and color adjustment; if a short circuit fault is detected, the enable signal processing circuit (26, see Figure 2) immediately locks the enhanced carrier modulation circuit (23), and resumes normal operation after the fault is cleared. Beneficial effects

[0009] Compared with the prior art, the present invention has the following advantages: 1. Fully compatible with the original system: It retains all the software control logic, communication protocol and synchronization frame mechanism of the multi-lamp consistent dimming system with time pulse width encoding superimposed on the DC bus. The hardware interface is fully matched with the original system. It can directly replace the original main control unit and lamp module without modifying the software program or rewiring, thus reducing the cost of industrial upgrading. 2. Significantly improved system stability: Constructing a full-link hardware protection architecture for the main controller and lighting fixtures, integrating multiple functions such as short circuit detection / locking, back EMF absorption, power reverse protection, voltage peak clipping, and overcurrent protection, reducing component failure rate by more than 90%, and adapting to complex lighting scenarios such as industrial, outdoor, and aquaculture. 3. Significantly improved signal processing accuracy: The addition of a ±5V dual power supply design solves the ripple interference problem of the original single positive voltage power supply. The extraction and decoding accuracy of pulse width encoded signals is improved by ≥70%, and the signal decoding success rate is 100% when the DC bus voltage fluctuates by ±10%. 4. Significantly enhanced load capacity: The main control terminal carrier modulation circuit adopts a dual MOS transistor (Q10 / Q4) parallel current amplification design, which increases the load capacity by 2-3 times. It can be adapted to a large-scale lighting system with ≥300 lamp modules (4) connected in parallel, and the power supply distance can reach ≥150 meters. 5. Improved light source drive adaptability and accuracy: The design incorporates an enhanced constant current drive circuit (45) that works in conjunction with pulse width encoding and decoding, integrating dual color temperature switching logic. The brightness adjustment levels reach 640 levels, and the color temperature adjustment levels reach 1024 levels. The brightness / color temperature consistency error of multiple lamps is ≤3%, which is better than the 5% of the original system. 6. Modular design and strong practicality: All hardware modules adopt standardized and modular design, which makes production, assembly and maintenance convenient. The core components are universally selected, reducing production and manufacturing costs and making them suitable for large-scale industrial applications. Attached Figure Description

[0010] Figure 1: Overall system topology diagram of the enhanced carrier-controlled lamp of the present invention.

[0011] Figure 2: Detailed view of the enhanced pulse width encoding master driver of the present invention (excluding the stepped power supply circuit).

[0012] Figure 3: Detailed diagram of the stepped power supply circuit of the present invention.

[0013] Figure 4: Detailed circuit diagram of the enhanced pulse width encoded carrier control lamp module of the present invention. Detailed Implementation

[0014] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. The scope of protection of the present invention is not limited to the following embodiments. Example

[0015] This embodiment provides an enhanced carrier-controlled lamp adapted to a pulse width encoded dimming system, applied to a 48V DC microgrid tunnel lighting scenario. It is compatible with 300 dual-color temperature LED lamps (white light + warm light) connected in parallel, with DC bus (3, see...) Figure 1 Power supply distance 150 meters, brightness adjustment levels 640, color temperature adjustment levels 1024.

[0016] The enhanced carrier-controlled lamp includes an enhanced pulse width encoding master driver (2, see Figure 2) and 300 parallel enhanced pulse width encoding carrier-controlled lamp modules (4, see Figure 4). The two are connected to a 48V DC bus (3, see Figure 1) and a 48V DC bus power supply (1, see Figure 1). The selection of core components is shown in the table below: The stepped power supply circuit (21, see Figure 3) of the enhanced pulse width encoding master driver (2) converts 48V to ±5V and 12V stable voltages, and the linear voltage regulator circuit (42, see Figure 3) inside the lamp... Figure 4 The 48V is converted to a stable 5V voltage, which powers each hardware module. The pulse width encoding signal processing circuit (22, see Figure 2) receives the 0-10V brightness signal and color switch signal from the tunnel lighting control console. After differential amplification and low-pass filtering, the signal is transmitted to the first microcontroller control module (27, see Figure 2). The first microcontroller control module (27) generates a pulse width encoding signal according to the original pulse width encoding rules. The signal is superimposed on the 48V DC bus (3) by the enhanced carrier modulation circuit (23, see Figure 2). The lower bridge arm MOS transistors (Q10 / Q4) are connected in parallel to realize current amplification, supporting 300 modules (4). The back EMF absorption circuit (24, see Figure 2) and the short circuit protection circuit (25, see Figure 2) provide real-time protection. If a short circuit is detected on the bus, the short circuit sampling resistor (R62) collects the fault voltage, and the enable signal processing circuit (26, see Figure 2) immediately locks the enhanced carrier modulation circuit (23).

[0017] 300 enhanced pulse width encoding carrier control lamp modules (4) are connected in parallel to the 48V DC bus (3). After anti-reverse filtering (41, see Figure 4), the lamp is powered by the linear voltage regulator circuit (42, see Figure 4) to generate 5V power. The pulse width encoding signal enhancement extraction circuit (43, see Figure 4) extracts the pulse width encoding signal on the bus. After RC low-pass filtering, limiting diode (D7) limiting, and low-pass filtering, the standard logic level is output to the decoding control unit (44, see Figure 4). The decoding control unit (44) analyzes the brightness and color channel parameters, receives the synchronization frame signal to calibrate the clock, and ensures that the time base of 300 modules (4) is consistent; the enhanced LED constant current drive circuit (45, see Figure 4) drives the dual-color lamp board (47) according to the analyzed parameters to realize the synchronous adjustment of brightness and color temperature, and the peak clipping circuit (46) absorbs the switching spikes in real time when the brightness is low.

[0018] In this embodiment, the system can work continuously for 720 hours without failure, the signal decoding success rate is 100% when the DC bus voltage fluctuates by ±10%, the brightness / color temperature consistency error of 300 modules (4) is ≤3%, the response time of the protection circuit is ≤1ms when there is a short circuit fault, and the core components are undamaged.

[0019] The scope of protection of this invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An enhanced carrier-controlled lamp adapted to a pulse-width encoded dimming system, characterized in that, The system includes an enhanced pulse width encoding (PWM) master driver and several parallel enhanced PWM carrier control lamp modules, connected via a 48V DC bus. The enhanced PWM master driver superimposes a dimming control signal conforming to time pulse width encoding rules onto the DC bus. The enhanced PWM carrier control lamp modules extract and decode the dimming control signal from the DC bus to achieve consistent dimming and color adjustment for multiple lamps. The enhanced PWM master driver includes a master-end stepped power supply circuit, a pulse width encoding signal processing circuit, an enhanced carrier modulation circuit, a back EMF absorption circuit, a short-circuit protection circuit, an enable signal processing circuit, and a first microcontroller control circuit. The enhanced PWM carrier control lamp modules include an anti-backflow filter circuit, a peak clipping circuit, a lamp-end linear voltage regulator power supply circuit, a pulse width encoding signal enhancement and extraction circuit, a dual-color lamp board, a decoding control unit, and an enhanced LED constant current drive circuit.

2. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The main control terminal stepped power supply circuit includes a BUCK step-down chip, an LDO voltage regulator chip, and a negative charge pump, which sequentially converts 48V DC voltage to 12V and 5V DC voltage, and the negative charge pump converts 5V to -5V, providing stable ±5V and 12V power supply to each module; the output terminal of the negative charge pump is connected in series with an anti-surge resistor.

3. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The pulse width encoded signal processing circuit includes a differential amplifier and a low-pass filter attenuator. It receives 0-10V luminance analog signals, which are differentially amplified, low-pass filtered, attenuated, and then transmitted to the first microcontroller control module along with color channel switch signals. The differential amplifier is powered by ±5V and 12V power supplies.

4. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The enhanced carrier modulation circuit includes a half-bridge driver chip, an upper bridge arm circuit, and a lower bridge arm current amplification circuit. The upper bridge arm circuit consists of a MOS transistor, a discharge resistor, and a freewheeling capacitor to prevent the upper and lower bridge arms from being short-circuited simultaneously. The lower bridge arm current amplification circuit consists of two NMOS transistors connected in parallel to improve the load-carrying capacity. The half-bridge driver chip outputs complementary high and low half-bridge drive signals according to the signal from the first microcontroller control module, and superimposes the pulse width encoded signal onto the 48V DC bus.

5. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The back EMF absorption circuit consists of a fast recovery diode and a large-capacity electrolytic capacitor, which absorbs the back EMF generated by the DC bus and the modulation circuit to prevent overvoltage breakdown of core components. The short-circuit protection circuit includes a short-circuit sampling resistor, a differential amplifier, and a comparator. The short-circuit sampling resistor collects the fault voltage signal, which is amplified by the differential amplifier and compared with the reference voltage to output a short-circuit fault signal. The enable signal processing circuit receives the short-circuit fault signal, controls the on / off state of the enhanced carrier modulation circuit, and simultaneously feeds back to the first microcontroller control module to shut down the output, achieving dual short-circuit locking.

6. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The anti-reverse filtering includes an anti-reverse diode and a filter capacitor to achieve power supply reverse protection and bus ripple filtering; the peak clipping circuit consists of a resistor, a capacitor and a diode, and is used to achieve controllable dimming at ultra-low brightness. The linear voltage regulator power supply circuit at the lamp end consists of resistors, transistors, capacitors, and Zener diodes to realize a linear LDO circuit and output a 5V power supply. The pulse width encoded signal enhancement and extraction circuit includes an RC low-pass filter network, a limiting diode, and a signal attenuation circuit. It separates the DC component from the pulse width encoded signal, and outputs a standard logic level signal after limiting, filtering, and shaping. The dual-color lamp board is composed of two colors of LEDs connected in series.

7. The enhanced carrier-controlled lamp according to claim 1, characterized in that, The decoding control unit includes a second microcontroller control module, which analyzes the brightness and color channel control parameters of the pulse width encoded signal through edge sampling and time measurement, and receives the synchronization frame signal for clock reset calibration to ensure time base consistency among multiple lamps. The enhanced LED constant current drive circuit includes a constant current drive chip and a dual-color control submodule. The constant current drive chip outputs a precise constant current to drive the two lamp boards according to the brightness parameters, and the dual-color control submodule realizes independent switching and mixing adjustment of the two colors according to the color channel parameters, and integrates overcurrent protection function.

8. The enhanced carrier-controlled lamp according to any one of claims 1-7, characterized in that, Both the first and second microcontroller control modules reuse the software control logic of the multi-lamp consistent dimming system with time pulse width encoding superimposed on the DC bus, including timing encoding, signal modulation, synchronization frame calibration, edge sampling and decoding logic, which is fully compatible with the original system.

9. A control method for an enhanced carrier-controlled lamp adapted to a pulse width encoded dimming system, characterized in that, Includes the following steps: The S1 48V DC bus power supply provides power to the enhanced pulse width coding master driver and all enhanced pulse width coding carrier control lamp modules. The power supply circuits of both synchronously convert 48V to ±5V, 12V and 5V stable voltages to power each hardware module. S2. The pulse width encoding master control driver's signal processing circuit receives external 0-10V luminance analog signal and color channel switch signal, and transmits them to the first microcontroller control module after differential amplification and low-pass filtering. S3. The first microcontroller control module generates a pulse width encoded signal carrying luminance, color channel parameters and synchronization frame according to the time pulse width encoding rules, and transmits it to the enhanced carrier modulation circuit. S4, the enhanced carrier modulation circuit superimposes the pulse width encoded signal onto the 48V DC bus to form a composite voltage waveform, the back EMF absorption circuit protects against back EMF in real time, and the short circuit protection circuit detects short circuit faults in the bus and circuit in real time. S5. Each enhanced pulse width encoded carrier control lamp module receives the composite voltage of the bus through anti-backflow filtering. After extraction, limiting, filtering and shaping by the pulse width encoded signal enhancement and extraction circuit, it outputs a standard logic level pulse width encoded signal to the decoding control unit. S6, the decoding control unit performs edge sampling, time measurement and duty cycle calculation on the pulse width encoded signal, analyzes the brightness and color channel control parameters, receives the synchronization frame signal to perform clock reset calibration, and ensures that the time base of all lamp modules is consistent; S7. The enhanced LED constant current drive circuit outputs a constant current drive signal based on the analyzed brightness parameters, controls the dual-color control chip to achieve color temperature switching based on the color channel parameters, and drives the dual-color LED board to achieve brightness and color adjustment. S8, the peak clipping circuit works at low brightness, absorbing the impact of the spikes generated when the circuit switches on the LED beads at low brightness, ensuring that the LED beads can be lit from extremely low brightness. S9. The enhanced pulse width encoding master driver periodically sends a synchronization frame signal, and each enhanced pulse width encoding carrier control lamp module is synchronously reset and calibrated to maintain the consistency of multi-lamp dimming and color adjustment; if a short circuit fault is detected, the enable signal processing circuit locks the enhanced carrier modulation circuit, and normal operation is restored after the fault is cleared.

10. The control method according to claim 9, characterized in that, In step S4, the lower bridge arm current amplification circuit of the enhanced carrier modulation circuit amplifies the current through two NMOS transistors connected in parallel, and its load capacity is adapted to ≥300 table lamp modules connected in parallel; in step S5, the pulse width encoding signal enhancement extraction circuit has a signal decoding success rate of 100% when the DC bus voltage fluctuates by ±10%.

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