A DALI-2 protocol constant-voltage dimming color temperature LED driving power supply and a control method thereof

Abstract

The application discloses a DALI-2 protocol constant-voltage dimming and color temperature adjusting LED driving power supply and a control method thereof, and belongs to the field of energy-saving lighting equipment. The driving power supply comprises a power supply main circuit (containing a PFC circuit, PF >= 0.99, standby power consumption < 0.5 W), a DALI communication interface module (supporting Part 251 / 252 / 253), a pushDIM / PushCCT control interface module, a microcontroller, first and second constant-voltage output channels, a PWM dimming driving module (0.1%-100% no frequency flicker dimming), a working mode configuration module (DT8 / DT6_C / DT6_W / dual DT6 four modes switchable), an advanced energy-saving control module (corridor dimming, constant-illumination output) and an NFC programming interface module. The application integrates multiple working modes and advanced energy-saving functions on a single hardware platform, solves the technical problems of single energy-saving function, insufficient energy data function and inflexible configuration of the existing DALI driving power supply, and has the remarkable beneficial effects of high power factor, high conversion efficiency, low standby power consumption, no frequency flicker dimming and on-demand lighting energy saving.

Description

Technical Field

[0001] This invention relates to the technical field of energy-saving lighting equipment, specifically to a constant voltage dimming and color temperature adjustable LED driver power supply and its control method based on the DALI-2 digital addressable lighting interface protocol. Background Technology

[0002] DALI (Digital Addressable Lighting Interface) is a data transmission protocol specifically designed for lighting control systems, defining the digital communication method between lighting appliances and system device controllers. DALI-2 is the second-generation version of the DALI protocol series, adding new functions to the original protocol, achieving interoperability between devices from different manufacturers, and introducing standardized requirements for control devices and equipment. This protocol standard is specified by the IEC 62386 series of standards, including IEC 62386-101 (General Requirements), IEC 62386-102 (General Requirements for Control Devices), IEC 62386-207 (LED Module Control Devices), and IEC 62386-209 (Color Control), etc.

[0003] With the rapid development of LED lighting technology and the deepening of global energy conservation and emission reduction policies, the functional requirements for LED driver power supplies in fields such as indoor office lighting and commercial lighting are becoming increasingly diversified and integrated. According to the "Classification of Strategic Emerging Industries (2018)," energy-saving lighting equipment is listed as an important part of the energy conservation and environmental protection industry, and its core technology involves the circuit driving device of electroluminescent light source.

[0004] Currently, various LED driver power supply products based on the DALI protocol have appeared on the market. For example: Chinese patent document CN221103598U discloses an "LED driver constant voltage power supply based on DALI-2 protocol," which includes an auxiliary power supply module, a driver power supply module, and a DALI interface module. It meets DALI-2 requirements and has output open-circuit and short-circuit detection functions. However, this patent document only supports basic DALI dimming functions, does not support color temperature control, does not support advanced data functions of the DALI-2 protocol (Part 251 / 252 / 253), and does not support NFC wireless programming configuration.

[0005] Chinese patent document CN117500111A discloses a "constant voltage dimming circuit, PCB board, and driving power supply," including an input processing unit, an output unit, a signal receiving unit, a signal demodulation unit, a signal processing unit, and a switch driving unit, which achieves constant voltage output control through DALI dimming signals. However, this patent document is limited to single-channel dimming, cannot achieve dual-channel color temperature control, and does not support multiple working mode switching.

[0006] Chinese patent document CN113382498A discloses a "DALI dimming and color-tuning driver power supply," including a flyback isolation constant voltage output circuit, a cold light adjustment circuit, a warm light adjustment circuit, an unloaded dummy load removal circuit, a fault detection circuit, and a DALI module circuit. However, the two output channels of this patent document use an independent control method, and the output power of the two channels cannot achieve complementary constantness during color temperature adjustment, resulting in fluctuations in the total brightness and affecting the lighting experience. Furthermore, this patent document does not support the DALI-2 Part 251 / 252 / 253 advanced data functions.

[0007] Chinese patent document CN223157262U discloses a "DALI-controlled constant voltage to constant current four-channel dimming and color-tuning controller," which achieves multi-channel dimming and color-tuning control through multiple constant current BUCK modules. However, this patent document uses a constant current output method, which is not suitable for constant voltage LED strip loads, and its multi-channel control architecture is complex, costly, and lacks advanced functions required for energy-saving management.

[0008] In addition, the HBGC-300-DA series DALI-2 LED driver power supply launched by a certain company adopts a constant power design and supports DALI-2 dimming, but it also does not support DT8 color temperature mode switching, NFC wireless programming, or Part251 / 252 / 253 advanced data functions.

[0009] In summary, the existing technology still has the following technical problems: First, the energy-saving control functions of existing DALI drivers are relatively limited. Most products only support basic DALI dimming functions and lack integrated support for advanced energy-saving control functions such as corridor dimming (corridor DIM, which enables on-demand lighting energy saving through human sensing) and constant illuminance output (CLO, which avoids excessive lighting energy saving through light decay compensation). This fails to meet the needs of intelligent lighting systems for refined energy management.

[0010] Second, existing DALI drivers lack sufficient support for the advanced energy data functions of the DALI-2 protocol. DALI-2 Part 252 (energy report reading function) allows lighting systems to monitor and report the energy consumption data of the driver in real time, which is an important technical means to achieve lighting energy-saving management. However, most DALI drivers currently only implement basic DALI dimming functions and lack full support for Part 251 (luminaire data query), Part 252 (energy report), and Part 253 (diagnostic and maintenance data reading), making it impossible to connect to intelligent energy management systems for energy consumption monitoring and energy-saving optimization.

[0011] Third, existing DALI driver power supplies have relatively limited functional modes, making it impossible to flexibly switch between multiple control modes on the same hardware platform. Users cannot configure the driver to DT6 single-channel dimming mode or DT8 adjustable white light color temperature mode according to actual application scenarios, which limits the applicable scenarios of the product. Different models of driver power supplies need to be developed for different application needs, increasing R&D resources and production costs.

[0012] Fourth, existing DALI driver power supplies have limitations in dimming and color temperature control. In color temperature control applications with dual-channel constant voltage output, current technology typically employs simple two-channel independent dimming control, which cannot achieve complementary output power between the two channels while maintaining a constant total output power. This results in brightness fluctuations during color temperature adjustment, affecting lighting quality. Furthermore, flickering is prone to occur under low-brightness dimming conditions, failing to meet the flicker-free standard requirements for ErP energy efficiency certification.

[0013] Fifth, the existing DALI driver power supply configuration is not flexible enough and lacks NFC wireless programming capability, resulting in low configuration efficiency in lighting installation sites or mass production scenarios, which increases labor costs and energy waste. Summary of the Invention

[0014] To address the aforementioned shortcomings of existing technologies, this invention provides a DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply and its control method, aiming to solve the following technical problems: 1. Existing DALI drive power supplies suffer from limited energy-saving control functions and lack advanced energy-saving features such as corridor dimming and constant illuminance output; 2. Insufficient support for energy data functions in Parts 251 / 252 / 253 of the DALI-2 protocol; 3. The problem of limited functional modes and inability to flexibly switch working modes; 4. Dual-channel color temperature adjustment cannot achieve constant power complementarity, leading to brightness fluctuations and energy waste; 5. Issues include inflexible configuration methods and lack of NFC wireless programming capabilities.

[0015] To achieve the above objectives, the present invention adopts the following technical solution: A DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply, comprising: The main power supply circuit includes an EMI filter circuit, a rectifier circuit, a power factor correction (PFC) circuit, an LLC resonant converter circuit, and a synchronous rectifier circuit connected in sequence, used to convert the AC input voltage into a stable DC constant voltage output; the power factor correction circuit enables the power factor of the drive power supply to reach 0.99 or higher; the LLC resonant converter circuit and the synchronous rectifier circuit enable the conversion efficiency of the drive power supply to reach 91% or higher, and the total harmonic distortion to be less than 5%; the power consumption of the main power supply circuit in standby mode is less than 0.5W; The DALI communication interface module, connected to the main power supply circuit, is used to receive DALI-2 protocol control commands on the DALI bus. The DALI communication interface module supports the DALI-2 protocol standard and is compatible with IEC 62386-101, IEC 62386-102, IEC 62386-207, and IEC 62386-209 standards. The DALI communication interface module also supports DALI Part251 luminaire data query function, Part252 energy report reading function (used for real-time monitoring and reporting of energy consumption data of the driver power supply, realizing energy management and energy-saving optimization of the lighting system), and Part253 diagnostic and maintenance data reading function. The pushDIM / PushCCT control interface module is connected to the main power circuit and is used to receive control signals from the PUSH dimming switch to realize pushDIM dimming and pushCCT color temperature control. The microcontroller is connected to the DALI communication interface module and the pushDIM / PushCCT control interface module respectively, and is used to parse control commands and generate corresponding dimming and color temperature control signals. The first constant voltage output channel and the second constant voltage output channel are respectively connected to the output terminal of the main power supply circuit. The first constant voltage output channel is used to connect the warm white LED load, and the second constant voltage output channel is used to connect the cool white LED load. Both output channels adopt constant voltage output mode, and the rated output voltage is 24VDC. The PWM dimming drive module is connected to the microcontroller, the first constant voltage output channel, and the second constant voltage output channel respectively. It is used to drive the first constant voltage output channel and the second constant voltage output channel respectively in a high-frequency PWM manner according to the control signal generated by the microcontroller, so as to achieve brightness and color temperature adjustment in a wide range of 0.1%-100%. The working mode configuration module is connected to the microcontroller and is used to receive configuration instructions through the DALI interface or NFC interface to configure the working mode of the drive power supply to one of the following four modes: (1) DT8 mode: single DALI address, supporting dimming and color temperature adjustment at the same time; (2) DT6_C mode: single DALI address, supporting only dimming, and the lamp is connected to the cool white output channel; (3) DT6_W mode: single DALI address, supporting only dimming, and the lamp is connected to the warm white output channel; (4) dual DT6 mode: two DALI addresses, and the cool white channel and the warm white channel can be controlled for dimming separately; An advanced energy-saving control module, connected to the microcontroller, is used to implement at least one of the following energy-saving functions: (a) Corridor dimming function: The presence of people is detected by motion sensors, and the brightness and color temperature of the lighting are automatically adjusted to achieve on-demand energy-saving lighting control that turns on when people are present and turns off when people leave. (b) Constant illuminance output function: Based on the light decay characteristics of LED light source, the output current is automatically increased during the LED's lifespan to compensate for the luminous flux decay, so that the illuminance remains constant and energy waste caused by over-compensation is avoided. (c) Emergency lighting function: When the AC input power is interrupted, it automatically switches to DC emergency power supply and continues to output at the preset energy-saving brightness (default 15%); The protection circuit module is connected to the main power supply circuit and the microcontroller to implement output short circuit protection, output overload protection, output over-temperature protection and output hot-swap protection. The NFC programming interface module is connected to the microcontroller and is used to receive configuration parameters wirelessly via NFC to enable wireless programming configuration of parameters such as the operating mode of the drive power supply, DALI address, dimming curve, power-on brightness, and protection function switch.

[0016] Furthermore, the microcontroller responds to DALI DT8 commands in DT8 mode, simultaneously adjusting brightness and color temperature via a single DALI address. Its power complementary control algorithm is as follows: P_WW = P_total × (1-C) P_CW = P_total × C Wherein, P_total is the target total output power (unit: W), which is obtained by mapping the DALI brightness command value D (dimensionless, range 0-254) according to the formula P_total=P_rated×(D / 254), and P_rated is the rated power of the drive power supply (unit: W); C is the color temperature normalized coordinate (dimensionless, range 0-1), which is obtained by mapping the DALIDT8 color temperature command according to the formula C=(CCT_actual-CCT_min) / (CCT_max-CCT_min), where CCT_actual is the target color temperature (unit: K), CCT_min is the minimum color temperature (2700K), and CCT_max is the maximum color temperature (6500K); P_WW is the output power of the warm white channel (unit: W), and P_CW is the output power of the cool white channel (unit: W); the sum of the output power of the two channels P_WW+P_CW=P_total always holds true, so that the total output power remains constant during the color temperature adjustment process.

[0017] The algorithm is based on the principle of light mixing in photometry: the mixed color temperature of two light sources with different color temperatures is determined by the ratio of their luminous flux. Under constant voltage driving conditions, the power of an LED is approximately proportional to its luminous flux; therefore, the power allocation ratio directly determines the mixed color temperature. This formula achieves the physical constraint of constant total power during color temperature adjustment, conforms to the law of conservation of energy, and avoids energy waste caused by power fluctuations.

[0018] Furthermore, the energy-saving control parameters of the corridor dimming function include: access sensing time F1 (default 1s, range 0-100s), sensing brightness PL (default 100%, range 0-100%), sensing color temperature PC (default coolest, range 0-100%), sensing hold time T1 (set by sensor), sensing wait time T2 (default 180s, range 0-60000s), leakage sensing time F2 (default 5s, range 0-100s), unattended brightness AL (default 10%, range 0-100%), unattended color temperature AC (default coolest, range 0-100%), unattended time T3 (default infinite, range 0-59999s or 60000s represents infinite), and leakage to shutdown time F3 (default 0s, range 0-100s). By setting the unattended brightness AL to a lower percentage value (default 10%), the lighting power is significantly reduced during unattended periods, achieving significant energy-saving effects.

[0019] Furthermore, the LED light decay compensation model for the constant illuminance output function is as follows:

[0020] Where Φ(t) is the luminous flux (unit: lm) after t hours of operation. The initial luminous flux is given by t, the cumulative operating time is given by t (hours), and α is the attenuation coefficient (dimensionless), obtained by fitting LM-80 test data of the LED light source. A typical value is [value missing]. β is the time exponent (dimensionless), obtained by fitting the LM-80 test data of the LED light source, with a typical value of 0.8-1.2; To maintain constant illuminance, the output current of the drive power supply increases with operating time according to the following formula:

[0021] Where I_rated is the rated output current (unit: A); The physical basis of this model is the physical aging mechanism of LED chips: LED luminous flux decay is mainly caused by factors such as epitaxial layer defect proliferation, phosphor aging, and encapsulation material degradation, which conforms to the basic laws of the Arrhenius thermal aging model. By accurately compensating for luminous decay, the long-term energy waste caused by excessive power margin in traditional solutions is avoided.

[0022] Furthermore, the DALI bus voltage range of the DALI communication interface module is 9.5V-22.5V, with a typical value of 16V, and the interface current consumption is 1.8mA; the two wires of the DALI port do not need to be distinguished as positive or negative; each DALI bus can connect up to 64 drivers, and the maximum communication length is 300 meters.

[0023] Furthermore, the PWM dimming drive module adopts a high-frequency PWM dimming method with a dimming range of 0.1%-100%. The dimming curve can be switched between logarithmic and linear dimming curves through a configuration tool. Flicker-free dimming can still be achieved at the lowest brightness of 0.1%, with a Pst LM value ≤0.008 and an SVM value ≤0.031, which meets the flicker-free standard requirements for ErP energy efficiency certification.

[0024] A control method for a DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply includes the following steps: S1: Receives working mode configuration instructions via DALI or NFC interface, and configures the drive power supply to one of DT8 mode, DT6_C mode, DT6_W mode or dual DT6 mode; S2: Receive dimming and / or color temperature control commands via the DALI or pushDIM interface; S3: The microcontroller parses control commands and generates corresponding PWM control signals based on the current operating mode; S4: The PWM dimming driver module drives the first constant voltage output channel and the second constant voltage output channel respectively according to the PWM control signal; S5: In DT8 mode, brightness and color temperature can be adjusted simultaneously through a single DALI address. The power of the two output channels varies complementaryly according to P_WW=P_total×(1-C) and P_CW=P_total×C, and the total output power remains constant. S6: In dual DT6 mode, the brightness of the two output channels can be controlled by two independent DALI addresses, and the current output ratio of the two channels can be set separately.

[0025] Furthermore, the control method also includes a corridor dimming energy-saving control step: when the sensor detects the presence of a person, the drive power supply outputs the sensing brightness PL (default 100%) and sensing color temperature PC; after the person leaves, after a sensing wait time T2, the output switches to the unattended brightness AL (default 10%) and unattended color temperature AC to achieve on-demand lighting energy saving; after an unattended wait time T3 and a leakage to shutdown time F3, the output is turned off.

[0026] Furthermore, the control method also includes a constant illuminance output energy-saving control step: the microcontroller records the cumulative operating time t of the drive power supply in real time, and calculates the output based on the LED light decay compensation model. It automatically adjusts the output current to I_out(t)=I_rated×exp(α×t^β) to compensate for the attenuation of LED luminous flux, maintain constant illuminance output, and avoid energy waste caused by excessive lighting.

[0027] Compared with the prior art, the present invention has the following advantages: 1. Significant energy-saving effect. This invention achieves a power factor (PF) ≥ 0.99 through a power factor correction circuit, and a conversion efficiency ≥ 93% through LLC resonant converter and synchronous rectification, with standby power consumption less than 0.5W, achieving high-efficiency energy saving from the power conversion stage. The corridor dimming function automatically reduces brightness to 10% during unoccupied periods, achieving lighting energy savings of 50%-80%. The constant illuminance output function avoids energy waste caused by excessive lighting through precise light decay compensation.

[0028] 2. Full support for DALI-2 advanced energy data functions. This invention fully supports DALI Part 252 energy report reading functions, which can monitor and report the energy consumption data of the driver power supply in real time, enabling the driver power supply to connect to the intelligent energy management system and realize refined energy management and energy-saving optimization of the lighting system.

[0029] 3. Flexible and configurable operating modes reduce resource waste. This invention allows switching between four modes—DT8, DT6_C, DT6_W, and dual DT6—through software configuration. The same hardware platform can adapt to different application scenarios, reducing the number of product models and resource waste.

[0030] 4. Constant power output during color temperature adjustment avoids energy waste due to fluctuations. The power complementary control algorithm of this invention (P_WW+P_CW=P_total) ensures that the total output power remains constant during color temperature adjustment, avoiding energy waste and decreased lighting quality caused by power fluctuations in traditional solutions.

[0031] 5. Flicker-free dimming, meeting ErP energy efficiency standards. This invention achieves flicker-free dimming (Pst LM≤0.008, SVM≤0.031) across the entire dimming range of 0.1%-100%, meeting ErP energy efficiency certification requirements. Experimental verification shows that the Pst LM value of this invention at the lowest brightness of 0.1% is only 0.001-0.008, while existing DALI driver power supplies under the same conditions have a Pst LM value of 0.05-0.20, proving that this invention achieves true flicker-free dimming across the entire dimming range.

[0032] 6. NFC wireless programming improves configuration efficiency. This invention supports NFC wireless programming configuration, which can significantly improve configuration efficiency and reduce labor costs in mass production and field installation scenarios. Attached Figure Description

[0033] Figure 1 This is a block diagram of the overall structure of the driving power supply of the present invention.

[0034] Figure 2 This is a schematic diagram of the wiring for the DT8 mode of the drive power supply of the present invention.

[0035] Figure 3 This is a wiring diagram of the DT6_C mode of the drive power supply of the present invention.

[0036] Figure 4 This is a wiring diagram of the DT6_W mode of the drive power supply of the present invention.

[0037] Figure 5 This is a schematic diagram of the dual DT6 mode wiring of the drive power supply of the present invention.

[0038] Figure 6 This is a schematic diagram of the pushDIM / PushCCT control wiring of the drive power supply of the present invention.

[0039] Figure 7 This is a timing diagram of the corridor dimming process of the driving power supply of the present invention.

[0040] Figure 8 The diagram shows the complementary power curves of the two channels when the color temperature is adjusted in DT8 mode, based on the color temperature of the power supply of this invention (the horizontal axis is the color temperature normalized coordinate C, dimensionless; the vertical axis is the power P, unit: W; curve 1 is the warm white channel power P_WW decreasing monotonically, curve 2 is the cool white channel power P_CW increasing monotonically, and curve 3 is the total output power P_total constant straight line).

[0041] Figure 9 This is a DALI dimming curve diagram of the driving power supply of the present invention (comparison of logarithmic and linear curves).

[0042] Figure 10 This is a flowchart of the control method for the driving power supply of the present invention.

[0043] Figure 11 This is a structural dimension diagram of the power supply for the present invention.

[0044] Figure 12 This is a schematic diagram showing the input / output port definition of the driving power supply of the present invention.

[0045] Figure 13 This is a schematic diagram of the installation of the driving power supply of the present invention. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] Example 1: Overall Structure of the Drive Power Supply like Figure 1 As shown, this embodiment provides a DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply, including a power supply main circuit, a DALI communication interface module, a pushDIM / PushCCT control interface module, a microcontroller, a first constant voltage output channel, a second constant voltage output channel, a PWM dimming drive module, a working mode configuration module, an advanced energy-saving control module, a protection circuit module, and an NFC programming interface module.

[0053] The main power supply circuit comprises an EMI filter circuit, a rectifier circuit, a power factor correction (PFC) circuit, an LLC resonant converter circuit, and a synchronous rectifier circuit, connected in sequence. The AC input voltage (rated range 200-240VAC, limiting range 180-264VAC) is filtered and rectified by the EMI filter, then the PFC circuit boosts the power factor to above 0.99. After further LLC resonant conversion and synchronous rectification, a stable 24VDC constant voltage is output. The main power supply circuit adopts SELV (Extra Low Voltage Safety) and Class II (Double Insulation) design, suitable for external use with lighting fixtures.

[0054] The main power supply circuit of this embodiment achieves a conversion efficiency of over 93% under full load conditions (typically 93.5% for the 240W model), with standby power consumption of less than 0.5W, meeting the standby power requirements for ErP energy efficiency certification. The power factor remains above 0.9 within the 20%-100% load range, and the total harmonic distortion is less than 5%.

[0055] The DALI communication interface module complies with IEC 62386-101 (DALI-2 General Requirements), IEC 62386-102 (DALI-2 Controller General Requirements), IEC 62386-207 (DALI-2 LED Module Controller), and IEC 62386-209 (DALI-2 Color Control) standards. The DALI bus voltage range is 9.5V-22.5V, with a typical value of 16V, and the interface current consumption is 1.8mA. The two wires of the DALI port do not require polarity distinction, and each DALI bus can connect up to 64 drivers.

[0056] The DALI Part252 energy reporting function is implemented as follows: the microcontroller monitors parameters such as the input voltage, input current, output power, and cumulative running time of the driver power supply in real time, and encapsulates the energy consumption data according to the DALI-2 Part252 standard data format. When the DALI master controller sends an energy report query command, the DALI communication interface module parses the command, the microcontroller reads the latest energy consumption data from the memory, and returns an energy report containing information such as current power, cumulative energy consumption, and running time via the DALI bus. This function enables the driver power supply to connect to an intelligent energy management system, realizing real-time monitoring and energy-saving optimization of lighting energy consumption.

[0057] The pushDIM / PushCCT control interface module receives control signals from the PUSH dimming switch, enabling pushDIM dimming (short press of the switch for 0.2-1s turns the light on / off, long press for 1-6s allows for stepless dimming or brightening) and pushCCT color temperature adjustment (short press for 0.2-1s cycles through 9 color temperature levels, long press for 1-6s allows for stepless color temperature adjustment). The pushDIM bus can support up to 50 drivers.

[0058] The NFC programming interface module supports receiving configuration parameters wirelessly via NFC, enabling wireless programming configuration of parameters such as the driver power supply's operating mode, DALI address, dimming curve, power-on brightness, and protection function switches. Using an NFC desktop or handheld programmer in conjunction with configuration software, driver power supply parameter configuration can be completed quickly without opening the luminaire housing, significantly improving configuration efficiency for mass production and on-site installation.

[0059] Example 2: Working Mode Configuration and Energy Saving Adaptation The operating mode configuration module enables flexible switching between four operating modes, allowing the same hardware platform to adapt to different energy-saving application scenarios: DT8 mode (e.g.) Figure 2 (As shown): The power supply responds to DALI DT8 commands with a single DALI address, supporting both brightness and color temperature adjustment. In this mode, users can send dimming and color temperature adjustment commands through a standard DALI master controller (supporting DT8). The power supply automatically maps the brightness and color temperature commands to the PWM duty cycle control of the two output channels. The power of the warm white channel and the cool white channel is complementaryly allocated according to the target color temperature, keeping the total output power constant. This mode is suitable for scenarios such as office lighting and commercial lighting that require simultaneous adjustment of brightness and color temperature to optimize lighting comfort and energy saving.

[0060] DT6_C mode (e.g.) Figure 3 As shown): The driver power supply responds to the DALI DT6 dimming command with a single DALI address, supports only brightness adjustment, and the output is connected to the cool white (CW) channel. This mode is suitable for single-color temperature lighting scenarios where only dimming is required and color temperature adjustment is not needed.

[0061] DT6_W mode (e.g.) Figure 4 As shown): The driver power supply responds to the DALI DT6 dimming command with a single DALI address, supports only brightness adjustment, and the output is connected to the warm white (WW) channel.

[0062] Dual DT6 mode (such as) Figure 5As shown): The driver power supply responds to the two DT6 dimming commands using two independent DALI addresses, allowing for independent brightness control of the cool white and warm white channels. In this mode, the current output ratio of each channel can be set separately via configuration software (WW output ratio + CW output ratio = 100%). For example, for a driver power supply with a rated output power of 100W, when the current output ratio is set to 40%, the CW channel can connect to a maximum load of 40W, and the WW channel can connect to a maximum load of 60W. This mode is suitable for special application scenarios requiring independent control of two loads.

[0063] Operating mode configuration can be completed via DALI or NFC interface without requiring hardware replacement. The factory default mode is DT8 mode.

[0064] Example 3: Dimming and Color Temperature Control Method and Energy Saving Effect The core of the dimming and color temperature control method of the present invention lies in the two-channel power complementary control strategy, which simultaneously achieves improved lighting quality and energy saving.

[0065] In DT8 mode, the microcontroller receives luminance commands (0-100% corresponding to DALI values ​​0-254) and color temperature commands (color temperature coordinates from warm white to cool white) from the DALI bus. The microcontroller converts the luminance command into a total output power reference value P_total = P_rated × (D / 254), and the color temperature command into normalized color temperature coordinates C = (CCT_actual - CCT_min) / (CCT_max - CCT_min). The warm white channel power P_WW and the cool white channel power P_CW satisfy: P_WW = P_total × (1-C) P_CW = P_total × C P_WW + P_CW = P_total (always true) like Figure 8 As shown, regardless of color temperature changes, the sum of the output power of the two channels always equals the total power corresponding to the target brightness. This characteristic ensures constant illuminance during color temperature adjustment, avoiding brightness jumps and energy waste caused by power fluctuations in traditional solutions.

[0066] The PWM dimming driver module employs a high-frequency PWM dimming method (frequency ≥ 1kHz), with a dimming range of 0.1%-100%. It achieves flicker-free dimming even at the lowest brightness of 0.1%. Testing shows that the Pst LM value (Short-Term Flicker Index) of this invention is 0.001-0.008, and the SVM value (Flicker Visibility Measurement) is 0.020-0.031, far exceeding the ErP energy efficiency certification requirements (Pst LM ≤ 1, SVM ≤ 1). In contrast, existing DALI driver power supplies have Pst LM values ​​of 0.05-0.20 and SVM values ​​of 0.10-0.50 at low brightness. This invention demonstrates significantly superior flicker performance under low-brightness dimming conditions compared to existing technologies, achieving truly flicker-free dimming.

[0067] Dimming curve (e.g.) Figure 9 As shown, the configuration tool allows switching between logarithmic and linear dimming profiles. Logarithmic dimming profiles better align with the human eye's perception of brightness (Weber-Fechner law), providing finer adjustment resolution in low-brightness areas and contributing to more precise energy-efficient dimming control.

[0068] Example 4: Advanced energy-saving function, corridor dimming Corridor dimming function (such as) Figure 6 , Figure 7 As shown, this is one of the important energy-saving functions of the present invention, which is applicable to places such as corridors, stairwells, and parking lots that need to automatically adjust the lighting brightness according to the presence of people, and can achieve 50%-80% lighting energy saving.

[0069] The process of dimming in the corridor is as follows: When the motion sensor detects a person entering the sensing area, the drive power supply immediately outputs the sensed brightness (PL, default 100%) and sensed color temperature (PC, default coolest color temperature) to provide sufficient illumination for the person.

[0070] Once the person leaves the sensing area, the driver enters a sensing standby phase, which lasts for T2 (default 180s). During the sensing standby phase, the driver continues to maintain the sensing brightness output.

[0071] After the waiting period ends, the driver switches to unattended mode, outputting unattended brightness (AL, default 10%) and unattended color temperature (AC, default coolest color temperature). By setting the unattended brightness to 10%, 90% of lighting energy consumption can be saved compared to 100% brightness.

[0072] After an unattended period of T3 (default indefinite), the power supply shuts off, achieving zero-power standby.

[0073] All parameters for corridor dimming (F1, PL, PC, T1, T2, F2, AL, AC, T3, F3) can be set via the configuration tool. Corridor dimming is activated by default at the factory. Push dimming and color grading mode is automatically disabled after switching to CorridorDIM mode.

[0074] The dimming mode in the corridor can be switched in the following two ways: Method 1 (Sensor Switching): Maintain movement within the effective sensing area for a preset time, such as 5 minutes, or by setting the sensor's duration to a preset time, such as more than 5 minutes, and maintaining sensing for a preset time, such as 5 minutes, the drive power will automatically switch to corridorDIM mode.

[0075] Method 2 (Normal Switch Switching): Replace the sensor with a normal switch, keep the switch on for 5 minutes, and the drive power will automatically switch to corridorDIM mode.

[0076] Example 5: Advanced Energy Saving Function – Constant Illuminance Output During long-term use, the luminous flux of LED light sources gradually decreases with increasing usage time. Traditional solutions involve reserving a large power margin during the design phase (typically 120%-150% of the initial luminous flux), resulting in excessive illumination for most of the LED light source's lifespan and causing significant energy waste.

[0077] The Constant Illuminance Output (CLO) function of this invention compensates for luminous flux decay by precisely increasing the drive current during the lifespan of the LED light source, thereby maintaining constant illuminance and avoiding energy waste caused by excessive lighting.

[0078] The CLO function is based on the following LED light decay compensation model:

[0079] Where Φ(t) is the luminous flux after t hours of operation. α is the initial luminous flux, t is the cumulative running time, α is the attenuation coefficient (obtained by fitting LM-80 test data of LED light source, with typical values ​​of 0.5×10^-6 to 2×10^-6), and β is the time exponent (with typical values ​​of 0.8-1.2).

[0080] To maintain constant illuminance, the output current of the drive power supply increases with operating time according to the following formula: I_out(t)=I_rated×exp(α×t^β) The microcontroller has a built-in real-time clock that continuously records the cumulative operating time t of the drive power supply. Users can set the expected lifespan (e.g., 50,000 hours) through configuration software. Based on the aforementioned light decay compensation model, the microcontroller calculates the output current compensation curve and automatically increases the output current of the PWM dimming drive module as the operating time increases.

[0081] Energy-saving effect verification: The driver power supply of this invention was compared with a driver power supply of the same specification without CLO function, driving the same type of LED light strip (initial luminous flux 1000lm) for 10,000 hours at an ambient temperature of 25℃. After 10,000 hours, the luminous flux of the LED light strip driven by the driver power supply without CLO function decreased to 85% of the initial value (850lm). To maintain the same illuminance level, the traditional solution needs to reserve about 18% power margin in the design (initial output power is 118% of the rated value). In the early stage of the LED light source's lifespan (about the first 5000 hours), it is in an over-illumination state, resulting in a large amount of energy waste. However, the driver power supply with the CLO function of this invention automatically increases the output current from the initial 100% to about 115% after 10,000 hours, and the luminous flux remains at 98% of the initial value (980lm). No power margin is required, and precise on-demand power supply is achieved throughout the entire lifespan, avoiding energy waste caused by over-illumination.

[0082] Example 6: Advanced Functions, Emergency Lighting The emergency lighting function allows the driver power supply to continue supplying power to the LED lights when the AC input is interrupted, meeting emergency lighting needs. In emergency mode, the driver power supply outputs 15% energy-saving brightness, saving 85% of energy compared to 100% brightness and extending the power supply time of the emergency battery.

[0083] The EL function of this invention supports two application scenarios: centralized emergency lighting systems and stand-alone emergency lighting systems. In DC input applications, the positive DC input terminal is connected to the ACL / DC+ terminal, and the negative DC input terminal is connected to the ACN / DC- terminal (if connected in reverse, the driver will not be damaged, but the normal operation of the EL function will be affected).

[0084] The emergency lighting function can be configured via software to set the output response after DC input. Setting 1: When DC input is applied, the output of the drive power supply remains unchanged, and the dimming function responds normally. This setting applies to centralized emergency lighting systems that are powered by DC from a central emergency power supply. The drive power supply maintains normal dimming and color temperature control functions under DC input.

[0085] Setting 2 (Default): When DC input is applied, the driver power supply output switches to the preset brightness (default 15%), and the dimming function is disabled. This setting applies to stand-alone emergency lighting systems, automatically maintaining a fixed low brightness output during AC power outages to extend the power supply time of the emergency battery.

[0086] Setting 2's energy-saving principle is based on the requirements of the EN 50172 emergency lighting standard, which stipulates that emergency lighting only needs to provide sufficient illuminance for safe evacuation (typically ≥1 lux), not normal operating illuminance. Limiting the output to 15% brightness maximizes the lifespan of the emergency battery while ensuring safe evacuation.

[0087] Example 7: Protection Function This invention integrates multiple protection functions to ensure the safe and reliable operation of the driver power supply and LED load: Output short-circuit protection: When a short circuit occurs at the LED output terminal, the microcontroller detects an abnormal drop in output voltage, immediately shuts down the PWM output, and enters a protection lockout state. The AC input must be disconnected for at least one minute; the drive power will automatically recover after power is restored.

[0088] Output overload protection: When the connected load exceeds the rated power, the power supply enters an intermittent output (hiccup) state, periodically turning the output on and off to limit the average output power and prevent overload damage. After reducing the load power, the power supply automatically resumes normal output.

[0089] Output over-temperature protection: When the internal operating temperature of the power supply exceeds the over-temperature protection threshold of the IC, the microcontroller shuts down the PWM output, and the power supply enters a shutdown protection state. Once the temperature drops to a safe range, the power supply automatically restarts and resumes operation.

[0090] Output hot-swap protection: This function prevents device burnout that may occur when an LED load with a voltage far below the open-circuit voltage is connected while the driver power is on. The hot-swap protection function can be enabled or disabled via the DALI or NFC interface.

[0091] The physical implementation of hot-swap protection is as follows: When the hot-swap protection function is enabled, a controllable discharge resistor (typically 10kΩ) and a voltage detection circuit are connected in parallel at the output of the driver power supply. Before the LED load is connected, the output is in a high-impedance state, and the output voltage is an open-circuit voltage (typically 24VDC). When the LED load is connected, the voltage detection circuit detects a momentary drop in the output voltage (due to the charging effect of the load capacitor). The microcontroller recognizes this event as a hot-swap event, immediately shuts down the PWM output and remains locked until a restart signal is detected (power-on or DALI / pushDIM switching command). This protection method effectively prevents inrush current from damaging the power switching transistor and the LED load.

[0092] In the following two applications, it may be necessary to disable the hot-swap protection function: (1) Applications where the driver power output is connected to a color temperature switching switch: When the switch is used to switch the color temperature, the hot-swap protection will be triggered, causing the LED to not light up; (2) Applications used in conjunction with a self-capacitive (independent) emergency control device: When the emergency self-test switch exits the emergency mode, the hot-swap protection will be triggered, causing the LED to not light up.

[0093] Example 8: Summary of Technical Effects To verify the technical effects of the present invention, the applicant conducted the following comparative experiments: Experiment 1: Comparison of Power Factor and Efficiency

[0094] Taking a 100W output power as an example, this invention can reduce power loss by about 3.6W compared with the prior art (efficiency 90%). Calculated based on 12 hours of operation per day and 365 days of operation per year, taking the 100W model as an example, under the rated output power condition, a single drive power supply can save about 15.8 kWh of electricity per year.

[0095] Experiment 2: Energy-saving effect of corridor dimming In a typical corridor lighting scenario (with a total of approximately 4 hours of human presence per day and 20 hours of unoccupied time), configuring the corridor dimming function automatically reduces the brightness to 10% during unoccupied periods. Compared to the traditional 100% constant-on solution, daily energy consumption is reduced from 2.4kWh (100W×24h) to 0.64kWh (100W×4h + 10W×20h), achieving an energy saving rate of 73.3%.

[0096] Experiment 3: Energy-saving effect of CLO function In a 10,000-hour accelerated aging test, the CLO function of this invention, through precise light decay compensation, ensured that the average output power of the drive power supply was 103.5% of the rated value throughout the test, while the average output power of the traditional reserved power margin solution was 115% of the rated value. Compared with the traditional solution, the CLO function can save approximately 11.5% of energy in 10,000 hours.

[0097] Experiment 4: Comparison of Dimming and Flicker Performance

[0098] The Pst LM value and SVM value of this invention are far lower than those of the prior art, reaching the high-frequency exemption level and fully complying with the flicker-free standard requirements of ErP energy efficiency certification.

[0099] Example 9: Product Specifications The power supply of this invention can be designed in various specifications according to different power requirements (such as...). Figure 11 , Figure 12 (as shown)

[0100] Input port definitions: ACL / DC+ (gray), ACN / DC- (gray), NC (gray), DA (gray), DA (gray).

[0101] Output port definitions: WW+ (red), WW- (black), CW+ (red), CW- (black).

[0102] Under normal operating conditions, the power supply has a lifespan of up to 100,000 hours (based on a 90% survival rate) and an MTBF of up to 500,000 hours (MIL-HDBK-217F, 25℃).

[0103] Example 10: Control Method Flow like Figure 10 As shown, the control method for the drive power supply of the present invention includes the following steps: S1: Receives working mode configuration instructions via DALI or NFC interface, and configures the drive power supply to one of DT8 mode, DT6_C mode, DT6_W mode or dual DT6 mode.

[0104] S2: Receive dimming and / or color temperature control commands via the DALI interface or pushDIM interface.

[0105] S3: The microcontroller parses control commands and generates corresponding PWM control signals based on the current operating mode.

[0106] S4: The PWM dimming driver module drives the first constant voltage output channel and the second constant voltage output channel respectively according to the PWM control signal.

[0107] S5: In DT8 mode, brightness and color temperature can be adjusted simultaneously through a single DALI address. The power of the two output channels varies complementaryly according to P_WW=P_total×(1-C) and P_CW=P_total×C, and the total output power remains constant.

[0108] S6: In dual DT6 mode, the brightness of the two output channels can be controlled by two independent DALI addresses, and the current output ratio of the two channels can be set separately.

[0109] In addition, the control method also includes corridor dimming energy-saving control steps and constant illuminance output energy-saving control steps (see Examples 4 and 5 for details).

[0110] Example 11: Installation Requirements like Figure 13 As shown, the installation of the drive power supply should meet the following requirements: The driver should be installed in a dry, acid-free, oil-free, and grease-free environment. The ambient temperature of the driver installation environment must never exceed Ta temperature (ambient temperature). The temperature of the driver mounting surface should be lower than Ta temperature. The driver should be kept at a safe distance from heat-generating components (such as lamp heat sinks).

[0111] If the driver is used externally (requires the use of a plug accessory), the installation of the driver should also meet the following conditions: (1) a certain distance should be maintained between the drivers; (2) the driver should be kept at a certain distance from surrounding objects; (3) two power outputs are not supported in parallel.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply, characterized in that, include: The main power supply circuit includes an EMI filter circuit, a rectifier circuit, a power factor correction circuit, an LLC resonant converter circuit, and a synchronous rectifier circuit connected in sequence, used to convert the AC input voltage into a stable DC constant voltage output; the power factor correction circuit enables the power factor of the drive power supply to reach above 0.99, and the power consumption of the main power supply circuit in standby mode is less than 0.5W; The DALI communication interface module is connected to the main power circuit and is used to receive DALI-2 protocol control commands on the DALI bus. The DALI communication interface module supports the DALI-2 protocol standard and supports DALI Part251 lamp data query function, Part252 energy report reading function and Part253 diagnostic and maintenance data reading function. The pushDIM / PushCCT control interface module is connected to the main power circuit and is used to receive control signals from the PUSH dimming switch. The microcontroller is connected to the DALI communication interface module and the pushDIM / PushCCT control interface module respectively, and is used to parse control commands and generate corresponding dimming and color temperature control signals. The first constant voltage output channel and the second constant voltage output channel are respectively connected to the output terminal of the main power supply circuit. The PWM dimming drive module is connected to the microcontroller, the first constant voltage output channel, and the second constant voltage output channel respectively. It is used to drive the first constant voltage output channel and the second constant voltage output channel in PWM mode according to the control signal generated by the microcontroller, so as to achieve brightness and color temperature adjustment in the range of 0.1%-100%. The working mode configuration module is connected to the microcontroller and is used to receive configuration instructions through the DALI interface or NFC interface to configure the working mode of the drive power supply to one of DT8 mode, DT6_C mode, DT6_W mode or dual DT6 mode. An advanced energy-saving control module, connected to the microcontroller, is used to implement at least one of the corridor dimming function and constant illuminance output function; The NFC programming interface module is connected to the microcontroller and is used to receive configuration parameters wirelessly via NFC to enable wireless programming configuration of the power supply's operating mode, DALI address, dimming curve, power-on brightness, and protection function switches.

2. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The microcontroller responds to the DALIDT8 command in DT8 mode, simultaneously adjusting brightness and color temperature via a single DALI address. Its power complementary control algorithm is as follows: P_WW = P_total × (1-C) P_CW = P_total × C Wherein, P_total is the target total output power (unit: W), which is obtained by mapping the DALI brightness command value D (dimensionless, range 0-254) according to the formula P_total=P_rated×(D / 254), and P_rated is the rated power of the drive power supply (unit: W); C is the color temperature normalized coordinate (dimensionless, range 0-1), which is obtained by mapping the DALIDT8 color temperature command according to the formula C=(CCT_actual-CCT_min) / (CCT_max-CCT_min), where CCT_actual is the target color temperature (unit: K), CCT_min is the minimum color temperature, and CCT_max is the maximum color temperature; P_WW is the output power of the warm white channel (unit: W), and P_CW is the output power of the cool white channel (unit: W); the sum of the output power of the two channels P_WW+P_CW=P_total always holds true.

3. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The energy-saving control parameters of the corridor dimming function include: access sensing time F1, sensing brightness PL, sensing color temperature PC, sensing waiting time T2, unattended brightness AL, unattended color temperature AC, and unattended time T3; by setting the unattended brightness AL to a percentage value lower than the sensing brightness PL, the lighting power is reduced during unattended periods to achieve energy saving.

4. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The constant illuminance output function is achieved in the following way: the microcontroller records the cumulative running time t of the drive power supply, and calculates the output based on the LED light decay compensation model. The output current is automatically adjusted to I_out(t) = I_rated × exp(α × t^β) to compensate for the luminous flux decay of the LED light source and maintain constant illuminance output; where Φ(t) is the luminous flux (unit: lm) after t hours of operation. α is the initial luminous flux (unit: lm), α is the attenuation coefficient (dimensionless), β is the time exponent (dimensionless), and I_rated is the rated output current (unit: A).

5. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The advanced energy-saving control module also includes an emergency lighting function, which supports both centralized and stand-alone emergency lighting systems. The emergency lighting function can be configured via software to set the output response action after DC input, including a first setting where the output remains unchanged and the dimming function responds normally when DC input is applied, and a second setting where the output jumps to a preset brightness and the dimming function is disabled when DC input is applied.

6. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, It also includes a protection circuit module, which is connected to the main power supply circuit and the microcontroller, to implement output short circuit protection, output overload protection, output over-temperature protection and output hot-swap protection.

7. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The dimming range of the PWM dimming drive module is 0.1%-100%, with a Pst LM value ≤0.008 and an SVM value ≤0.031 at the lowest brightness of 0.1%. The dimming curve can be switched between logarithmic dimming curve and linear dimming curve through the configuration tool.

8. The DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 1, characterized in that, The conversion efficiency of the main power supply circuit is ≥93%, and the total harmonic distortion is less than 5%.

9. A control method for a DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply, applied to the driver power supply according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Receives working mode configuration instructions via DALI or NFC interface, and configures the drive power supply to one of DT8 mode, DT6_C mode, DT6_W mode or dual DT6 mode; S2: Receive dimming and / or color temperature control commands via the DALI or pushDIM interface; S3: The microcontroller parses control commands and generates corresponding PWM control signals based on the current operating mode; S4: The PWM dimming driver module drives the first constant voltage output channel and the second constant voltage output channel respectively according to the PWM control signal; S5: In DT8 mode, brightness and color temperature can be adjusted simultaneously through a single DALI address. The power of the two output channels varies complementaryly according to P_WW=P_total×(1-C) and P_CW=P_total×C, and the total output power remains constant. S6: In dual DT6 mode, the brightness of the two output channels is controlled by two independent DALI addresses.

10. The control method for a DALI-2 protocol constant voltage dimming and color temperature adjustable LED driver power supply according to claim 9, characterized in that, It also includes corridor dimming energy-saving control steps: when the sensor detects the presence of people, the drive power supply outputs the sensing brightness PL; after the people leave, after the sensing wait time T2, it switches to the unattended brightness AL output. The unattended brightness AL is lower than the sensing brightness PL, realizing on-demand lighting energy saving.

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