Intelligent and low-depth dimming system

Abstract

The invention relates to the field of intelligent dimming, and discloses an intelligent and low-depth dimming system, which comprises an input part, an EMI (Electro-Magnetic Interference) part, a rectifying and filtering part, a PFC (Power Factor Correction) boosting part, a feedback part, a master control PWM / PFM (Pulse Width Modulation / Pulse Frequency Modulation) part, an intelligent dimming part, a dial-up current regulating part, a light control module, an afterglow removing part, an output rectifying and filtering part, a dial-up color temperature regulating part and an output part, the filtering part is composed of an LF1 and a CX1, and the rectification filtering part is composed of a BD1 and a CBB1 / EC1. Multi-functionalization of a product is achieved through a low-cost scheme, the reliability of the product is improved, the service life of the product is prolonged, the visual effect is optimized through the extremely low dimming depth, the product performance and the user experience are improved, the overall efficiency of the system can reach 85%-95% through reasonable combination of an optional PFC module and high-efficiency topology BUCK / Flyback, and optimal balance can be achieved among energy efficiency, cost and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent dimming, and specifically to an intelligent and low-depth dimming system. Background Art

[0002] Under the background that people's demands for lighting quality and energy conservation are continuously increasing, and technologies such as the Internet of Things and sensors are constantly developing, developing an intelligent and low-depth dimming system can automatically adjust the brightness and color temperature of the light source according to the ambient light and user needs, achieving energy conservation and consumption reduction, improving lighting comfort and quality, and at the same time achieving delicate and smooth dimming in the low brightness range to protect the health of the human eye.

[0003] Most traditional intelligent power supplies are assembled from intelligent modules, with relatively single function modules, making it difficult to meet the market diversification. In places with more functions, it is necessary to add multiple different function modules to achieve, resulting in a large volume, extremely high application and development costs. Therefore, it is necessary to develop an intelligent and low-depth dimming system. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides an intelligent and low-depth dimming system to solve the problems of relatively single functions, low integration, high cost, and difficulty in meeting market diversification of traditional power supplies.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: An intelligent and low-depth dimming system includes an input part, an EMI part, a rectification and filtering part, a PFC boost part, a feedback part, a main control PWM / PFM part, an intelligent dimming part, a DIP switch for adjusting current, a light control module, eliminating afterglow, an output rectification and filtering part, a DIP switch for adjusting color temperature, and an output part. The input part has F1, the filtering part is composed of LF1 and CX1, the rectification and filtering part is composed of BD1 and CBB1 / EC1, the PFC boost part is composed of L1, Q1, D1, and EC1, the feedback part is composed of R13 and U1, the main control PWM / PFM is composed of R1, Q2, D2, L3, R7, C11, U11, R8, R14, R18, R12, R, C1, D5, and R2, the DIP switch for adjusting power is composed of R9, R19, R20, R21, R22, R23, and K2, the light control module is composed of R16 and GD1, the eliminating afterglow is composed of D4, D3, and K1, the output rectification and filtering part is composed of EC2, the DIP switch for adjusting color temperature and the output part are composed of K3, where VCC and VDD are external power supply nodes.

[0006] By adopting the above technical solutions, the intelligent and low-depth dimming system protects through the F1 fuse in the input part, filters interference through the LF1 and CX1 in the EMI part, improves the power quality through the rectifier filter BD1, CBB1 / EC1 and the optional PFC boost inductor L1, etc. The feedback part composed of components such as R13, U1 and the main control PWM / PFM part R1 forms a closed-loop control. Combining the digital code power adjustment R9 in the intelligent dimming part and the light control module R16, GD1 to achieve manual / automatic brightness adjustment, the afterglow elimination diode D4, etc. eliminates the afterglow after the LED goes out, and the output rectifier filter EC2 stabilizes the power supply. The digital code color temperature adjustment and the output part K3 switch the color temperature, and finally achieve an intelligent lighting effect with high-efficiency filtering, power factor correction, precise dimming and color adjustment, afterglow elimination protection and stable energy output.

[0007] Preferably, the input part includes an AC input module, the AC input module is electrically connected to an EMI part, and the EMI part is electrically connected to a rectifier filter module.

[0008] Preferably, the output end of the rectifier filter module is electrically connected to a PFC boost module, and the output end of the PFC boost module is electrically connected to the input end of the main control PWM / PFM control module.

[0009] Preferably, the PFC boost module is an optional configuration. When the PFC boost module is omitted, the output end of the rectifier filter module is directly connected to the input end of the main control PWM / PFM control module.

[0010] Preferably, the main control PWM / PFM control module adopts a BUCK, Flyback or BUCK-BOOST topology structure. The main control PWM / PFM control module is electrically connected to a feedback loop, and the input end of the feedback loop is electrically connected to the output end of the output rectifier filter module for sampling the output voltage / current signal and feeding it back to the main control module to adjust the PWM / PFM parameters.

[0011] Preferably, the output end of the main control PWM / PFM control module is connected to the control end of the afterglow elimination module. The afterglow elimination module is an optional configuration for eliminating the afterglow phenomenon after the LED goes out, and the output end of the afterglow elimination module is electrically connected to the input end of the output rectifier filter module.

[0012] Preferably, the input end of the feedback loop is electrically connected to the output end of the intelligent dimming module.

[0013] Preferably, the input end of the intelligent dimming module is respectively connected to a digital code power adjustment module and a light control module.

[0014] Preferably, the output end of the output rectifier filter module is connected to a digital code color temperature adjustment module, and the digital code color temperature adjustment module is connected to an output module.

[0015] Preferably, the output end of the output rectifying and filtering module is directly connected to the output module.

[0016] Working principle: First, the alternating current input from AC enters the EMI part for processing. The purpose is to filter out the electromagnetic interference signals introduced from the power grid, prevent these interferences from entering the subsequent circuits and affecting the normal operation of other modules, and at the same time prevent the electromagnetic interference generated by the device itself from being conducted back to the power grid through the AC input line. If the PFC boost module is selected, this module will process the rectified and filtered direct current. By controlling the circuit to adjust the current waveform to match the phase of the voltage waveform, it improves the power factor, reduces harmonic pollution, and at the same time raises the voltage to an appropriate level to provide a more stable input for the subsequent main control circuit. When omitted, the rectified and filtered direct current directly enters the main control PWM / PFM module. The main control PWM / PFM module adopts topologies such as BUCK, Flyback, or BUCK - BOOST. Through pulse width modulation PWM or pulse frequency modulation PFM technology, according to the load demand and feedback signal, it precisely adjusts the output voltage or current to achieve stable driving of the load. When it is necessary to eliminate the afterglow phenomenon after the LED goes out, the trigger signal of the afterglow elimination module is provided by the main control PWM / PFM control module. The afterglow elimination part discharges the residual electrical energy of the signal output from the main control part and then transfers the signal to the output rectifying and filtering part for further processing to ensure that the current or voltage output to the load is stable and free from afterglow - related interference. Then, the output rectifying and filtering module further rectifies and filters the electrical signal processed by the main control PWM / PFM control module and the afterglow elimination module, removes high - frequency clutter and ripple, makes the output direct current smoother and more stable, and provides a high - quality power supply for the LED load. The output part delivers the stable direct current to the LED load. When it is necessary to adjust the color temperature, the DIP switch color temperature adjustment module can adjust the current ratio of different color temperature LEDs to achieve color temperature adjustment. The intelligent dimming part receives the signals of the DIP switch power adjustment and light control module, and through the feedback part, feeds the signals back to the main control PWM / PFM part to achieve manual or automatic dimming, meet the lighting requirements in different scenarios, realize the multi - functionality of the product, improve the reliability and service life of the product, the extremely low dimming depth optimizes the visual effect, enhances the product performance and user experience. The 1% depth dimming technology solution overcomes many technical bottlenecks in the existing technology and can be widely applied to other non - isolated circuit architecture topologies such as PFC + BUCK, BUCK, PFC + BUCK - BOOST, BUCK - BOOST, etc. and other isolated circuit architecture topologies such as PFC + Flyback and Flyback.

[0017] The present invention provides an intelligent and low - depth dimming system, which has the following beneficial effects: 1. In the present invention, a low-cost solution is used to realize the multi-functionality of the product, improving the reliability and service life of the product. The extremely low dimming depth optimizes the visual effect, enhancing the product performance and user experience. Through the reasonable combination of an optional PFC module and a high-efficiency topology BUCK / Flyback, the overall system efficiency can reach 85-95%, achieving an optimal balance among energy efficiency, cost, and safety.

[0018] 2. In the present invention, the system has functions such as intelligent dimming, intelligent light and photosensor control, intelligent timing, multi-level current and color temperature adjustment, afterglow removal, and low-depth dimming, solving many technical bottlenecks of the power supply in the lighting field and greatly reducing the application cost.

[0019] 3. In the present invention, by disconnecting the circuit after turning off the double-pole relay to achieve zero voltage turn-off, the purpose of eliminating the light residue after turn-off is achieved, greatly enhancing the product performance and user experience, and being widely applied in the fields of plant lighting and high-dynamic lighting.

[0020] 4. In the present invention, through EMI filtering, PFC correction, PWM / PFM main control, and multi-module cooperation, low-depth precise dimming and color adjustment with functions such as overload protection, electromagnetic compatibility, adjustable power / brightness / color temperature, and afterglow removal are realized, providing an efficient and stable intelligent power supply solution for LED lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the PFC+BUCK circuit architecture of the present invention; Figure 2 It is a schematic diagram of the BUCK circuit architecture of the present invention; Figure 3 It is a schematic diagram of the PFC+BUCK-BOOST circuit architecture of the present invention; Figure 4 It is a schematic diagram of the BUCK-BOOST circuit architecture of the present invention; Figure 5 It is a schematic diagram of the PFC+Flyback circuit architecture of the present invention; Figure 6 It is a schematic diagram of the Flyback circuit architecture of the present invention; Figure 7 It is a schematic block diagram of the system module composition of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to the attached Figure 1 - Attachment Figure 7 In an embodiment of the present invention, an intelligent and low-depth dimming system is provided, including an input part, an EMI part, a rectification and filtering part, a PFC boost part, a feedback part, a main control PWM / PFM part, an intelligent dimming part, a DIP switch for adjusting current, a light control module, a function for removing afterglow, an output rectification and filtering part, a DIP switch for adjusting color temperature, and an output part. The input part has F1, the filtering part consists of LF1 and CX1, the rectification and filtering part consists of BD1 and CBB1 / EC1, the PFC boost part consists of L1, Q1, D1, and EC1, the feedback part consists of R13 and U1, the main control PWM / PFM consists of R1, Q2, D2, L3, R7, C11, U11, R8, R14, R18, R12, R, C1, D5, and R2, the DIP switch for adjusting power consists of R9, R19, R20, R21, R22, R23, and K2, the light control module consists of R16 and GD1, the function for removing afterglow consists of D4, D3, and K1, the output rectification and filtering part consists of EC2, and the DIP switch for adjusting color temperature and the output part consists of K3. Among them, VCC and VDD are external power supply nodes; Specifically, in the input section, when the circuit is overloaded or short-circuited, the fuse F1 melts to cut off the input power supply, preventing the subsequent components from being damaged due to overcurrent. In the EMI electromagnetic interference section, the common-mode inductor LF1 suppresses differential-mode / common-mode interference. The common-mode inductor LF1 presents a high impedance to common-mode interference and attenuates the interference signal. The X capacitor CX1 filters out high-frequency noise in the input power supply, meets the EMC electromagnetic compatibility standard, reduces the pollution to the power grid. CX1 is an X capacitor, which is a safety capacitor connected across the live wire L and the neutral wire N, and can prevent short circuits from causing safety risks. The rectifier bridge BD1 in the rectification and filtering section converts alternating current into pulsating direct current, and filters it through the combination of the CBB1 high-frequency capacitor and the EC1 electrolytic capacitor to output a smooth DC voltage. And the EC1 electrolytic capacitor can store energy to maintain the stability of the output voltage during the period when the rectifier bridge is not conducting. In the PFC boost section, the power factor correction circuit stores energy through the inductor L1, chops the wave through the switch tube Q1, and continues the current through the diode D1, which can boost the power factor to 0.95+ and reduce harmonic pollution. When Q1 is conducting, the current forms a loop through L1 to Q1, and L1 stores energy. When Q1 is turned off, the induced electromotive force of L1 is superimposed on the input voltage and charges EC1 through D1, and the output voltage is higher than the input. By controlling the on / off time of Q1, the input current waveform follows the voltage waveform to improve the power factor. The feedback section samples the output voltage / current through the resistor R13 and feeds it back to the main control chip through the optocoupler U1 to form a closed-loop control to stabilize the output parameters. The main control PWM / PFM controls the on / off of the switch tube Q2 through pulse width modulation PWM or frequency modulation PFM, adjusts the energy storage of the inductor L3, and realizes the precise control of the output voltage / current. The DIP switch K2 for power adjustment switches different precision resistors such as R9, R19, R20, R21, R22, R23 to set the output power level and realize manual power adjustment. By switching different resistance values through K2, the feedback voltage is changed, so that the main control chip adjusts the output power according to the feedback. The photosensitive resistor GD1 of the light control module detects the ambient light intensity and is converted into an electrical signal through the voltage-dividing resistor R16 to automatically adjust the output brightness. For example, it automatically brightens when the light is dim. Thus, a voltage-dividing circuit is formed by the voltage-dividing resistor R16 and GD1. To eliminate the afterglow, the normally open relay K1 can control the discharge path. When the normally open relay K1 is conducting, the diodes D3 / D4 release the residual charge of the LED load to eliminate the afterglow phenomenon after turning off and improve the user experience. The output rectification and filtering section further filters out high-frequency ripples through the electrolytic capacitor EC2 to stabilize the output voltage and ensure that a low-ripple DC voltage is provided to the LED load. The DIP switch K3 can switch different color temperature LED paths to adjust the color temperature through current distribution. Finally, the LED is driven to emit light through the output port. U3 is a digital capacitor isolation chip that adopts a fully differential isolation capacitor technology. The high-voltage isolation capacitor composed of SiO2 provides a reliable insulation barrier between different voltage domains and provides a reliable high-frequency signal transmission path; to ensure stable data transmission quality,Introduce the on-off keying (OOK) modulation and demodulation technology. The transmitter TX modulates the input signal onto the carrier frequency. That is, TX transmits the high-frequency signal through the isolation capacitor in one input state, and no signal passes through the isolation capacitor in another input state. Then the receiver reconstructs the input signal based on the detected in-band data, providing a reliable data transmission path and solving the problems of errors and consistency caused by the loss of pulse signals. After the input L / N is powered on, it is filtered by the common mode of LF1 and CX1, rectified full-wave, and then filtered by CBB1 or EC1. The main control chips U1, U2, and U3 are powered on at VDD through the three-terminal voltage regulator of Q4, R5, and D7 to supply power to pin 1 of U3. VCC is supplied to pin 8 of U3 through the three-terminal voltage regulator of Q5, R4, and D6 to start power supply. After power-on, a 5V reference voltage is generated at pin 23 of U2. Through R11, a high level is output at pin 5 and flows into pin 3 of U3 through R17. The output of pin 6 makes Q6 conduct through R24 and R25. After Q6 conducts, through the bias resistors R3 and R6, the base of Q3 is less than the emitter, and Q3 conducts. One path supplies power to U1, and the other path energizes the normally open relay K1 through D4. The relay PIN3 and PIN4, PIN5 and PIN6 are attracted to form a closed loop, and after being rectified and filtered by EC2, the output starts. U2, as an intelligent control chip, powers on and first detects the light control PS+ pin, that is, the GD1 pin. GD1 is a photosensitive diode. Secondly, it detects the PR+ PIN6 pin, and finally detects the DIM+ PIN10 pin. When R18 is empty and GD1 does not detect the infrared wavelength of natural light, the U2 intelligent control chip synchronously activates the timing function. Secondly, it detects the PR+ voltage, that is, the dial code adjusts the current. The PR+ pin is connected to pin 6 of U2. This voltage is obtained by the series voltage division of the 5V reference voltage of pin 3 through R12 and R9, R19, R20, R21, R22, and R23. When the divided voltage of pin 6 is close to 5V, the maximum current is output. By defining different resistors, the divided voltage of pin 6 is changed to achieve the purpose of adjusting the output current. The output current calculation formula is wIpr-out = Ioutmax * (Vpin6 / VREF). That is, when the dial switch is set so that the voltage of pin 6 is 4V, U2 latches a duty cycle of 4 / 5 = 0.8. At this time, if the DIM+ voltage is the maximum, then U2 outputs a duty cycle of 0.8 at pin 9 and adjusts the output current to Ioutmax * 0.8 by using the latched duty cycle for dimming. Similarly, if the dial switch is set so that the voltage of pin 6 is 2.5V, U2 latches a duty cycle of 2.5 / 5 = 0.5. At this time, if the DIM+ voltage is the maximum, then U2 outputs a duty cycle of 0.5 at pin 9 and adjusts the output current to Ioutmax * 0.5. If the voltage of pin 10 is 5V, that is, there is an external 0-10V / resistor / PWM signal connected so that the voltage of pin 10 is 5V and it enters the dimming state, then the output current at this time is Ioutmax * 0.5 * 0.5, corresponding to a duty cycle of 0.25 generated at pin 9 of U2. The current flows through the U3 digital capacitor isolation chip to generate a 1:1 duty cycle and is transmitted to the PWM signal pin of U1.The PWM signal is converted into an analog voltage inside U1 through analog or digital conversion to serve as the reference voltage for the CS pin inside U1, thereby restricting the IPK current flowing through the Q2 MOS transistor to achieve the effect of reducing the output current. The external connection of 0 - 10V / resistor / PWM signal access makes the voltage of PIN10 close to that during fast turn-off. At this time, the output of pin 29 of U2 has a minimum duty cycle of about 1%. The PWM signal enters pin 7 of U3 through R8 and outputs a duty cycle of about 1% for equivalent transmission to the PWM pin of U1, thereby outputting a minimum current of about 1% to achieve low-depth dimming. When the external connection of 0 - 10V / resistor / PWM signal access makes the voltage of PIN10 lower than that during turn-off, at this time, both pin 29 and pin 5 of U2 output low levels, which are transmitted to the input pins 2 and 3 of U3 through R8 and R17, output from pins 7 and 6, and fed to the PWM pin through R13 to turn off the dimming. At the same time, the low level of pin 6 of U3 makes Q6 cut off and Q3 non-conductive, U1 stops power supply, D4 is non-conductive, D3 is disconnected from both ends of the relay coil after power supply is cut off, and the two ends of the winding change from high level at pin 1 and low level at pin 2 before power supply to high level at pin 1 and low level at pin 2. At this time, D3 conducts to achieve the magnetic reset of the relay winding, and the K1 relay is attracted to disconnect the output loop and disconnect through the relay contacts 3 and 6, thereby achieving the purpose of removing the afterglow of the non-isolated power supply. At the same time, the output is connected to two different color temperature LED light sources, and the color temperature is adjusted through the negative pole K3 toggle switch. For example, in the aspect of educational lighting, for the "General Classroom Lighting Design Specification for Primary and Secondary Schools in China" (GB / T 36876 - 2018): The required color temperature is 3300K - 5300K, and two color temperature light sources of 3500K and 5000K can meet the requirements of different scenarios. For indoor lighting, based on the ISO8995 - 1:2013 office lighting standard, the color temperature varies from 2700K to 6500K for different indoor scenarios. When R18 is empty, GD1 does not detect the infrared wavelength of natural light. When the U2 intelligent control chip is synchronized to turn on the time control function, whether the power supply is placed indoors or outdoors, when GD1 photosensitive light control detects that the light is less than a certain value, the conventional requirement is that the luminous flux is less than 75Lm, the power supply starts to work and the time control function is turned on. By detecting PR + PIN6 and DIM + PIN10, U2 outputs a current with a corresponding duty cycle. The U2 intelligent control chip is internally default divided into three time controls. The first stage is the maximum current of the power supply after detection. The first stage timing is started through the internal clock of U2. During this period, if GD1 does not detect natural light, the timing continues; if GD1 does not detect natural light, the timing continues. When the first stage clock ends, the second stage is started. The second stage starts a fixed current reduction mode. For example, when the second stage is started after the first stage clock ends, the output current drops to 50% of the first stage current or other ratios; if GD1 does not detect natural light, the timing continues. When the second stage clock ends, the third stage is started. The third stage is still a fixed current reduction mode. For example, when the second stage is started after the second stage clock ends, the output current drops to 30% of the first stage current or other ratios. If the 8th pin remains high level due to no detection of natural light all the time, the fixed current in the third stage will continue.The output starts to turn off when the U28 pin remains low until natural light is detected. When natural light is not detected and the U28 pin remains high, the time control function is sequentially enabled and continues to loop. Any stage of the time control uses the level of pin 8 as the judgment signal. As long as the level remains high within a fixed time, it is enabled, and when it goes low, it is turned off. The GD1 light control level threshold is defined as high level below 3.3V, low level below 1.6V, and the 1.6V - 3.3V is the light control action hysteresis zone, effectively avoiding the problem of false light control actions. During the timing period, functions such as adjusting current and dimming by the DIP switch are not affected and can be used normally. When R18 is 0R, the time control function is turned off, and at this time, it is equivalent to a conventional power supply, and the on / off or dimming is used to achieve on and off.

[0024] Please refer to the appendix Figure 1 - appendix Figure 7 The input part includes an AC input module, the AC input module is electrically connected to an EMI part, and the EMI part is electrically connected to a rectification and filtering module; Specifically, the EMI filtering module can filter out interference signals such as high-frequency noise, reducing the working pressure of the rectification and filtering module. Since the AC power input may contain various electromagnetic interferences from the power grid, passing through the EMI filtering module first can effectively suppress these interference signals from entering the subsequent circuit, avoiding interference from affecting the normal operation of modules such as rectification and filtering, PFC boost, and main control, and ensuring the stability and purity of the power output.

[0025] Please refer to the appendix Figure 1 - appendix Figure 7 The output end of the rectification and filtering module is electrically connected to a PFC boost module, and the output end of the PFC boost module is electrically connected to the input end of the main control PWM / PFM control module; Specifically, the PFC boost module can adjust the input current waveform, correct the power factor, make the input current waveform match the voltage waveform in phase, reduce the reactive power loss, reduce the harmonic pollution to the power grid, improve the power utilization rate, and can also stably boost the rectified DC voltage, and then provide a more stable input voltage for the main control PWM / PFM control module to ensure its efficient and stable operation, meeting application scenarios with higher requirements for power quality and power supply stability.

[0026] Please refer to the appendix Figure 1 - appendix Figure 7 The PFC boost module is an optional configuration. When the PFC boost module is omitted, the output end of the rectification and filtering module is directly connected to the input end of the main control PWM / PFM control module; Specifically, when omitting the PFC boost module, the rectification and filtering module can be directly connected to the main control PWM / PFM control module, reducing the use of PFC-related components, simplifying the circuit structure, lowering the production cost and the power supply volume, and being applicable to scenarios that are cost-sensitive, have relatively low power, and have low requirements for power quality.

[0027] Please refer to the appendix Figure 1 - appendix Figure 7 , the main control PWM / PFM control module adopts a BUCK, Flyback or BUCK-BOOST topology structure. The main control PWM / PFM control module is electrically connected to a feedback loop, and the feedback loop is electrically connected to an output rectification and filtering module; Specifically, for the BUCK topology structure of the main control PWM / PFM control module, the input voltage can be stepped down and converted into a voltage suitable for the load to achieve constant current / constant voltage output, and the efficiency is high, greater than 90%, which is applicable to scenarios such as LED driving that require stable current. For the BUCK-BOOST topology structure, the main control PWM / PFM control module can step up or step down to adapt to scenarios with large fluctuations in the input voltage. For the Flyback topology, the main control PWM / PFM control module can achieve electrical isolation between the input and output through an isolation transformer, which is applicable to occasions with high safety requirements. The PFC module improves the power factor, and the Flyback provides isolated output, which is applicable to medium and high power and isolated scenarios. By collecting the voltage / current signals of the output rectification and filtering module through the feedback loop, comparing the sampled values with the reference values, and adjusting the duty cycle or frequency of the PWM / PFM, precise constant current / constant voltage control is achieved.

[0028] Please refer to the appendix Figure 1 - appendix Figure 7 , the output end of the main control PWM / PFM control module is connected to the control end of the afterglow elimination module. The afterglow elimination module is an optional configuration for eliminating the afterglow phenomenon after the LED goes out. The output end of the afterglow elimination module is electrically connected to the input end of the output rectification and filtering module; Specifically, by connecting the output end of the main control PWM / PFM part through the afterglow elimination module, the switch control signal of the main control can be received, and by connecting the input end of the output rectification and filtering part through the afterglow elimination module, the processed signal can enter the rectification and filtering.

[0029] Please refer to the appendix Figure 1 - appendix Figure 7 , the input end of the feedback loop is electrically connected to the output end of the intelligent dimming module; Specifically, by comparing the actual output parameters, such as current and voltage, with the target values of the intelligent dimming module through the feedback loop, the duty cycle of the PWM / PFM is dynamically adjusted to achieve precise dimming.

[0030] Please refer to the appendix Figure 1 - Appendix Figure 7 , the input ends of the intelligent dimming module are respectively connected with a DIP power adjustment module and a light control module; Specifically, the intelligent dimming module receives the input signals of the DIP power adjustment module and the light control module. The user sets a fixed power through the manual DIP switch, which is applicable to scenarios that require constant brightness. The light control module can automatically adjust the output power according to the ambient light intensity to achieve energy saving. Thus, the intelligent dimming module can automatically switch between two modes, enhancing the user experience.

[0031] Please refer to the appendix Figure 1 - Appendix Figure 7 , the output end of the output rectification and filtering module is connected with a DIP color temperature adjustment module, and the DIP color temperature adjustment module is connected with an output module; Specifically, the output rectification and filtering module can provide a stable DC power supply. Then, the DIP color temperature adjustment module switches the circuit topology through the DIP switch, and can adjust the current ratio of different color temperature LEDs to achieve color temperature adjustment. Then, the DIP color temperature adjustment module outputs the adjusted current / voltage signal to the output module. Then, the output module is responsible for transmitting the color temperature-adjusted electrical signal to the load. The output module is the port where the energy of the entire power supply circuit is finally output to the load, thus realizing the conversion of electrical energy to light energy. By integrating multi-gear current adjustment and color temperature adjustment functions, it meets diverse market applications, flexibly controls the current intensity and color temperature parameters, and significantly improves the functionality, comfort, and wide adaptability.

[0032] Please refer to the appendix Figure 1 - Appendix Figure 7 , the output end of the output rectification and filtering module is directly connected to the output module; Specifically, the output rectification and filtering part rectifies and filters the signal after the afterglow removal part, removes the AC components and noise therein, etc., to obtain a stable DC output, and then it can be input to the output part, which is applicable to basic lighting scenarios with no requirement for color temperature, and can improve efficiency and reduce costs.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent and low-depth dimming system, comprising an input section, an EMI section, a rectification and filtering section, a PFC boost section, a feedback section, a main control PWM / PFM section, an intelligent dimming section, a DIP switch for adjusting current, a light control module, a function for eliminating afterglow, an output rectification and filtering section, a DIP switch for adjusting color temperature, and an output section, characterized in that The input part has F1. The filtering part consists of LF1 and CX1. The rectifying and filtering part consists of BD1 and CBB1 / EC1. The PFC boost part consists of L1, Q1, D1, and EC1. The feedback part consists of R13 and U1. The main control PWM / PFM consists of R1, Q2, D2, L3, R7, C11, U11, R8, R14, R18, R12, R, C1, D5, and R2. The DIP switch for power adjustment consists of R9, R19, R20, R21, R22, R23, and K2. The light control module consists of R16 and GD1. The afterglow elimination part consists of D4, D3, and K1. The output rectifying and filtering part consists of EC2. The DIP switch for color temperature adjustment and the output part consist of K3. Among them, VCC and VDD are external power supply nodes.

2. The intelligent and low-depth dimming system according to claim 1, wherein The input part includes an AC input module, and the AC input module is electrically connected to an EMI part, and the EMI part is electrically connected to a rectifying and filtering module.

3. The intelligent and low-depth dimming system according to claim 2, wherein The output end of the rectifying and filtering module is electrically connected to a PFC boost module, and the output end of the PFC boost module is electrically connected to the input end of a main control PWM / PFM control module.

4. An intelligent and low-depth dimming system according to claim 3, wherein, The PFC boost module is an optional configuration. When the PFC boost module is omitted, the output end of the rectifying and filtering module is directly connected to the input end of the main control PWM / PFM control module.

5. An intelligent and low-depth dimming system according to claim 2, characterized in that, The main control PWM / PFM control module adopts a BUCK, Flyback, or BUCK - BOOST topology structure. The main control PWM / PFM control module is electrically connected to a feedback loop, and the input end of the feedback loop is electrically connected to the output end of the output rectifying and filtering module, for sampling the output voltage / current signal and feeding it back to the main control module to adjust the PWM / PFM parameters.

6. The intelligent and low-depth dimming system according to claim 2, wherein The output end of the main control PWM / PFM control module is connected to the control end of the afterglow elimination module. The afterglow elimination module is an optional configuration for eliminating the afterglow phenomenon after the LED is turned off. The output end of the afterglow elimination module is electrically connected to the input end of the output rectifying and filtering module.

7. An intelligent and low-depth dimming system according to claim 1, characterized in that The input end of the feedback loop is electrically connected to the output end of the intelligent dimming module.

8. An intelligent and low-depth dimming system according to claim 7, characterized in that, The input ends of the intelligent dimming module are respectively connected to a DIP switch for power adjustment module and a light control module.

9. An intelligent and low-depth dimming system according to claim 1, characterized in that, The output end of the output rectifying and filtering module is connected to a DIP switch for color temperature adjustment module, and the DIP switch for color temperature adjustment module is connected to an output module.

10. An intelligent and low-depth dimming system according to claim 1, characterized in that, The output end of the output rectifying and filtering module is directly connected to the output module.

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