Intelligent LED lamp strip power supply control system with automatic voltage jump function

Abstract

The invention relates to the technical field of LED lighting control, and discloses an intelligent LED lamp strip power supply control system with an automatic voltage jump function, which comprises an intelligent control power supply, a series topology LED lamp strip and a plurality of cascaded constant current voltage division control chips, and further comprises a topology discovery and automatic addressing module for detecting the total node number and allocating addresses; the cascade voltage division and dynamic power consumption balancing module is used for calculating a target voltage division value according to the total node number; the power and data cooperative transmission module broadcasts a target partial voltage value on a power supply bus and realizes two-way communication; the node localization constant-current driving module is used for the chip to receive the target voltage division value, adjust the actual voltage division value and drive the LED in a constant-current mode; and the intelligent fault diagnosis and controllable bypass module is used for monitoring a fault of the chip, reporting a fault containing an address and responding to an instruction to activate a bypass. According to the invention, the cascade voltage division and dynamic power consumption equalization module is adopted, so that the technical effects of consistent power and highly uniform brightness obtained by all LED nodes in an ultra-long distance are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED lighting control, in particular to an intelligent LED lamp strip power supply control system with automatic jump voltage function. BACKGROUND

[0002] LED lamp strips are rapidly becoming the core element of modern lighting design with their softness, tailorability and rich color. In urban landscape lighting, large building contour outlining or decorative lighting projects for super-long bridges, designers urgently need a linear light source that can continuously and uninterruptedly emit light. These application scenarios pose a serious challenge to the laying length of LED lamp strips. The distance of a single continuous operation often needs to reach tens of meters, or even hundreds of meters.

[0003] At present, the LED lamp strip technology on the market has developed in several different directions. Among them, the low-voltage parallel type lamp strip (such as DC 12V or DC 24V) is the most popular. Its advantages are mature technology, low product cost, and high safety in installation and daily use due to low working voltage, which is very suitable for short-distance home or commercial decoration within 5 meters. Another mainstream technology is intelligent control type lamp strip, which usually uses SPI or DMX512 protocol. This type of solution communicates through a special data bus, and its biggest advantage is that it can realize powerful point-by-point control function, and can arbitrarily change the color of each pixel point, thereby creating complex dynamic light effects such as flowing water and chasing.

[0004] However, when the above existing technologies are directly applied to super-long distance scenarios, their respective limitations become unacceptable. The low-voltage parallel scheme will encounter a disastrous line voltage drop in long distances. The FPC copper foil of the lamp strip itself has resistance, and the total current accumulation of hundreds of meters will cause a huge voltage loss, resulting in a much lower actual voltage at the end of the lamp strip than at the power supply end. This physical property directly causes the phenomenon of first bright and tail dark, and the lighting effect is seriously uneven. In order to avoid this problem, the only way is to re-connect the main power supply every few meters, which makes the on-site wiring extremely cumbersome and greatly increases the use of high-cost copper cables; on the other hand, the high-voltage series scheme that appears to solve the voltage drop brings a fatal reliability problem. It is a pure series loop, and any open-circuit damage to any LED node will immediately cut off the entire circuit, causing the entire hundred-meter lamp strip to go out. This single-point vulnerability, which causes one lamp to be damaged and the entire string to go out, is unacceptable on buildings where high-altitude maintenance is difficult; as for the intelligent scheme that relies on data lines, the structure of FPC changes from 2 lines to 4 lines or 5 lines, which not only increases the cost and failure points, but also causes the data signal itself to attenuate and distort during long-distance transmission, making the system extremely complex. SUMMARY

[0005] In view of the defects of the prior art, the intelligent LED lamp strip power supply control system with automatic jump voltage function is provided to solve the problems of serious voltage drop and uneven brightness of the low-voltage parallel scheme in long-distance application, the reliability problem of single-point failure of the high-voltage series scheme, and the technical defects of the intelligent control scheme that relies on additional data lines, resulting in complex system wiring and high cost.

[0006] To achieve the above object, the application is implemented by the following technical scheme: the intelligent LED lamp strip power supply control system with automatic jump voltage function comprises an intelligent control power supply, a series topology LED lamp strip, and a plurality of cascade constant current voltage division control chips arranged on the series topology LED lamp strip, characterized in that the system further comprises:

[0007] a topology discovery and automatic addressing module for detecting the total number of nodes of the plurality of cascade constant current voltage division control chips when the system is powered on, and assigning a unique logical address to each cascade constant current voltage division control chip;

[0008] a cascade voltage division and dynamic power consumption balancing module for the intelligent control power supply to calculate a target voltage division value according to the total number of nodes;

[0009] a power and data collaborative transmission module for realizing the intelligent control power supply broadcasting the target voltage division value to the plurality of cascade constant current voltage division control chips on the same power supply bus carrying direct current power, and realizing bidirectional data communication based on the logical address;

[0010] a node localized constant current driving module arranged inside each cascade constant current voltage division control chip for receiving the target voltage division value and adjusting the internal DC / DC converter accordingly to make the actual voltage division value of the chip tend to the target voltage division value, and then using the actual voltage division value corresponding power to provide constant driving current for the local LED lamp beads;

[0011] an intelligent fault diagnosis and controllable bypass module for each cascade constant current voltage division control chip to report fault information containing its own logical address by using the bidirectional data communication when monitoring local faults, and respond to the bypass instruction addressed to the own logical address issued by the intelligent control power supply to activate the internal controllable bypass switch.

[0012] Preferably, the topology discovery and automatic addressing module comprises:

[0013] the intelligent control power supply broadcasts an initial address assignment instruction;

[0014] The first cascaded constant current voltage dividing control chip receives the initial address allocation instruction, binds its own logical address, and generates a new address allocation instruction by incrementing the address value in the instruction and forwarding it downstream;

[0015] The subsequent cascaded constant current voltage dividing control chip repeats the receiving, binding, incrementing, and forwarding process;

[0016] The last cascaded constant current voltage dividing control chip confirms itself as the end of the link when it does not detect a downstream response within a preset timeout period, and reports a link end confirmation message containing the total number of nodes to the intelligent control power supply.

[0017] Preferably, the power and data collaborative transmission module includes:

[0018] The intelligent control power supply realizes downlink communication by superimposing a high-frequency alternating current data component on a constant direct current component;

[0019] The cascaded constant current voltage dividing control chip realizes uplink communication by actively changing its own equivalent input impedance, causing synchronous fluctuations in the total voltage at the output end of the intelligent control power supply;

[0020] The data demodulation unit of the intelligent control power supply decodes the data signal of the uplink communication by monitoring fluctuations in the total voltage at the output end.

[0021] Preferably, the cascaded voltage dividing and dynamic power consumption balancing module includes:

[0022] The intelligent control power supply calculates the target voltage dividing value based on the total number of nodes and its total output voltage;

[0023] Each cascaded constant current voltage dividing control chip receives and stores the target voltage dividing value;

[0024] An input voltage closed-loop control logic is activated inside each cascaded constant current voltage dividing control chip, which monitors the input and output voltages of the chip in real time and calculates the actual voltage dividing value;

[0025] The input voltage closed-loop control logic compares the actual voltage dividing value with the target voltage dividing value and adjusts the control parameters of the internal DC / DC converter based on the error to stabilize the actual voltage dividing value at the target voltage dividing value.

[0026] Preferably, the node-localized constant current driving module includes:

[0027] The DC / DC converter inside the cascaded constant current voltage dividing control chip is provided with a current detection unit for monitoring the actual driving current flowing through the local LED lamp bead in real time;

[0028] The cascaded constant current voltage dividing control chip is internally provided with a local constant current control loop, which compares the actual driving current with an internal current reference;

[0029] The local constant current control loop automatically adjusts the control parameters of the DC / DC converter according to the comparison error, so that the actual driving current constantly tracks the internal current reference.

[0030] Preferably, the intelligent fault diagnosis and controllable bypass module comprises:

[0031] The cascaded constant current voltage dividing control chip is internally integrated with a fault self-checking unit for monitoring the working state of the local LED load, which includes the open circuit state of the local LED load, the short circuit state of the local LED load or the overheat state of the chip;

[0032] When the cascaded constant current voltage dividing control chip detects a fault, it generates a diagnostic message containing its own logical address and fault code, and preferentially executes fault reporting;

[0033] The intelligent control power supply receives the diagnostic message and executes central decision-making;

[0034] The intelligent control power supply sends down an execution bypass instruction for the logical address;

[0035] The cascaded constant current voltage dividing control chip that has failed activates the controllable bypass switch after receiving the execution bypass instruction.

[0036] Preferably, the input voltage closed-loop control logic inside the cascaded constant current voltage dividing control chip works in cooperation with the local constant current control loop, the local constant current control loop preferentially adjusts the DC / DC converter to maintain the actual driving current constant, and the input voltage closed-loop control logic subsequently intervenes to adjust the DC / DC converter to make the actual voltage dividing value forcibly return to the target voltage dividing value.

[0037] Preferably, the cascaded constant current voltage dividing control chip changes the equivalent input impedance through an internally controlled switch impedance element;

[0038] The switch impedance element is controlled to be temporarily turned on or turned off, or the working point of the DC / DC converter is controlled to change, so as to cause periodic changes in the equivalent input impedance, thereby realizing load modulation of uplink data.

[0039] Preferably, the intelligent fault diagnosis and controllable bypass module further comprises a passive bypass element;

[0040] The passive bypass element is connected in parallel with the controllable bypass switch between the main current input terminal and the main current output terminal of the cascade constant current voltage dividing control chip;

[0041] The breakdown voltage of the passive bypass element is set to be higher than the target voltage dividing value, for forced conduction to maintain the bus current loop when the cascade constant current voltage dividing control chip is in catastrophic open circuit and the controllable bypass switch is disabled.

[0042] Preferably, the last cascade constant current voltage dividing control chip starts an internal timer after forwarding the new address allocation instruction;

[0043] The last cascade constant current voltage dividing control chip triggers a response timeout event when no valid response is received from the downstream within the preset timeout period, and confirms itself as the end of the link.

[0044] The application provides a smart LED lamp strip power supply control system with automatic voltage jump function.

[0045] 1、The application adopts a cascade voltage dividing and dynamic power consumption balancing module, so that each cascade constant current voltage dividing control chip actively intercepts a target voltage dividing value calculated by an intelligent control power supply and broadcasted from a high-voltage constant current bus, thereby achieving the technical effect that all LED nodes on an ultra-long distance obtain consistent power and highly uniform brightness, and solving the fundamental deficiency of sudden voltage drop of a remote node and serious brightness unevenness caused by line parasitic resistance compared with the prior art scheme relying on low-voltage parallel power supply.

[0046] 2、The application adopts an intelligent fault diagnosis and controllable bypass module, realizes node fault self-checking, active reporting of a carrying address, and accurate bypass in response to a power supply instruction, thereby achieving the technical effect that when an open circuit or short circuit fault occurs in a single node, the continuity of the entire series current loop is not affected, and solving the single-point fault vulnerability problem of lamp damage and full string extinguishing compared with the simple series topology structure in the prior art.

[0047] 3、The application adopts a power and data cooperative transmission module, utilizes load modulation and other technologies to realize bidirectional data communication on the same pair of main power supply buses carrying electric energy, thereby achieving the technical effect that topology discovery, point-by-point dimming, and fault feedback can be realized without any additional data lines, and solving the defects of complex system wiring, bulky FPC structure, and high construction cost compared with the intelligent control scheme in the prior art which needs to lay an independent data bus (such as DMX or SPI). BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 The figure is a system architecture schematic diagram of an embodiment of the application;

[0049] Figure 2 For the specific working scenario of the embodiment of the present application, the cooperative work flow diagram is shown.

[0050] Explanation of reference numerals:

[0051] 10, topology discovery and automatic addressing module; 20, power and data cooperative transmission module; 30, cascaded voltage division and dynamic power consumption balancing module; 40, node localized constant current driving module; 50, intelligent fault diagnosis and controllable bypass module; 100, intelligent control power supply; 200, series topology LED lamp strip; 300, cascaded constant current voltage division control chip. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] Referring to the drawings Figure 1 , Figure 1 The system architecture diagram of the intelligent LED lamp strip power supply control system with automatic voltage jump function according to an embodiment of the present application is shown.

[0054] The present application provides an intelligent LED lamp strip power supply control system with automatic voltage jump function. The system adopts a series topology architecture with high-voltage constant current (HV-CC) power supply.

[0055] The system can include, in physical composition, an intelligent control power supply 100, a series topology LED lamp strip 200, and a plurality of cascaded constant current voltage division control chips 300.

[0056] The intelligent control power supply 100, as the source end device of the system, functions to generate high-voltage constant current , and integrates a data modulation unit and a data demodulation unit for data interaction with downstream devices.

[0057] The series topology LED lamp strip 200 is a flexible printed circuit board (FPC) with at least two main power supply buses arranged thereon for carrying high-voltage constant current .

[0058] The plurality of cascaded constant current voltage division control chips 300 are mounted on the series topology LED lamp strip 200 at predetermined intervals and are responsible for driving one or more groups of LED lamp beads locally.

[0059] In terms of topology structure, the plurality of cascaded constant current voltage division control chips 300 are connected in series along the main power supply buses in an electrical manner.

[0060] Constant current output by the intelligent control power supply 100 , from one end of the series topology LED lamp strip 200, in turn, through each cascading constant current voltage dividing control chip 300, and finally from the other end of the series topology LED lamp strip 200 back to the intelligent control power supply 100, thereby forming a single closed current loop.

[0061] In order to realize the stable operation and intelligent control of the above-mentioned series topology architecture, the system is logically divided into five modules that work together.

[0062] The five modules that work together include: topology discovery and automatic addressing module 10, power and data collaborative transmission module 20, cascading voltage dividing and dynamic power consumption balancing module 30, node local constant current driving module 40, and intelligent fault diagnosis and controllable bypass module 50.

[0063] The topology discovery and automatic addressing module 10 is responsible for automatically detecting the total number of nodes of the cascading constant current voltage dividing control chip 300 on the series link when the system is powered on , and assigning a unique logical address to each cascading constant current voltage dividing control chip 300 .

[0064] The power and data collaborative transmission module 20 is responsible for simultaneously carrying direct current power for power supply and data signals for bidirectional communication on a single constant current loop .

[0065] The cascading voltage dividing and dynamic power consumption balancing module 30 is responsible for actively intercepting or dividing a voltage from the bus by each cascading constant current voltage dividing control chip 300 , and can dynamically adjust the value according to the instructions of the intelligent control power supply 100, in order to realize the step-by-step distribution and balancing of power.

[0066] The node local constant current driving module 40 is set inside each cascading constant current voltage dividing control chip 300, and is responsible for efficiently converting the intercepted power into constant driving current for local LED lamp beads , and responding to the dimming instructions issued by the intelligent control power supply 100.

[0067] The intelligent fault diagnosis and controllable bypass module 50 is responsible for ensuring the robustness of the series link. Through self-checking, fault information reporting, and controllable bypass switch activation of the cascading constant current voltage dividing control chip 300, it ensures that the continuity of the entire current loop is not affected when a single cascading constant current voltage dividing control chip 300 fails.

[0068] The specific implementation of the five modules working in coordination will be described in detail below.

[0069] The topology discovery and automatic addressing module 10 is responsible for automatically detecting the accurate total number of the cascade constant current voltage dividing control chips 300 connected in series on the link during the system power-on initialization stage initiated by the intelligent control power supply 100 , and assigning a unique logical address for each cascade constant current voltage dividing control chip 300 in the current power-on cycle . The logical address is the technical basis for the subsequent intelligent control power supply 100 to realize accurate control of a specific node, power consumption balancing, and fault diagnosis.

[0070] In a specific embodiment, the working method of the topology discovery and automatic addressing module 10 can include the following steps:

[0071] S101: After the system is powered on, the intelligent control power supply 100 as the master control unit superimposes a topology discovery instruction on the high-voltage constant current through its built-in data modulator , and broadcasts the instruction to the entire current loop. In a preferred implementation, the instruction can be a "logical address assignment" instruction, for example , where is an integer counter with an initial value of 1. That is, the intelligent control power supply 100 broadcasts .

[0072] S102: The first cascade constant current voltage dividing control chip 300 (i.e., node 1) closest to the intelligent control power supply 100 in the current loop receives and decodes the instruction from the bus.

[0073] S103: The internal logic unit of node 1 verifies the instruction. After verification, the address value in the instruction is extracted and stored as the logical address of node 1 in an internal volatile or non-volatile register. That is, the binding of is completed.

[0074] S104: After completing its own address binding, node 1 performs an increment operation on its internal address counter to generate a new instruction . Subsequently, node 1 sends the new instruction to the bus downstream (i.e., in the direction of current outflow) through its data modulation unit (used for upstream communication, here for downstream forwarding).

[0075] ​S105: The second cascaded constant current voltage dividing control chip 300 (i.e. node 2) receives the instruction from the upstream node 1, stores , and generates and forwards the instruction downstream.

[0076] S106: The receive-store-increment-forward process is carried out step by step along the serial topology LED strip 200. The first cascaded constant current voltage dividing control chip 300 receives , stores , and forwards . This process functionally implements a daisy-chain type of step-by-step automatic addressing.

[0077] S107: The last cascaded constant current voltage dividing control chip 300 (i.e. node ) receives , stores , and generates and forwards the instruction downstream.

[0078] S108: After forwarding , node starts an internal timer to wait for a response or handshake signal from the downstream device within a pre-set timeout period .

[0079] S109: Since node is the physical end of the link, there is no node , so node will not receive any valid response from the downstream within the period. This response timeout event makes node confirm itself as the end-of-line (EOL).

[0080] S110: After confirming itself as the end-of-line, node changes its responsibility to report the topology discovery result to the smart control power supply 100. Node generates an end-of-line confirmation message containing its own logical address as the valid information of the total number of nodes.

[0081] S111: Node uses the uplink communication mechanism (e.g. load modulation) of the power and data co-transmission module 20 to send the message back to the smart control power supply 100.

[0082] S112: The data demodulation unit of the intelligent control power supply 100 receives and decodes . After successful decoding, the intelligent control power supply 100 learns that the total number of nodes on the current series link is . This value is stored in the controller of the intelligent control power supply 100 as a key input parameter for the cascade voltage division and dynamic power consumption balancing module 30 to calculate the power distribution strategy (e.g., to calculate ).

[0083] The power and data collaborative transmission module 20 functions to utilize the series constant current loop characteristics of the system to achieve bidirectional data communication between the intelligent control power supply 100 and the plurality of cascade constant current voltage division control chips 300 on the same pair of main power supply buses that carry electrical energy. The implementation of this module simplifies the FPC structure and external wiring of the series topology LED light strip 200 without the need to lay additional data lines.

[0084] In a specific embodiment, the power and data collaborative transmission module 20 establishes a power and data co-loading model. The instantaneous current on the main power supply bus is defined as the linear superposition of the direct current power component and the alternating current data component .

[0085] That is, ;

[0086] wherein, is the bus instantaneous current; is the constant direct current component provided by the intelligent control power supply 100, which mainly functions to provide operating power for all cascade constant current voltage division control chips 300; is a high-frequency alternating current modulation signal carrying digital information, whose amplitude is designed to be much smaller than to ensure that it does not affect the stability of the direct current power supply.

[0087] The working method of the power and data collaborative transmission module 20 can include the following steps:

[0088] S201: In the implementation of downlink communication (i.e., the intelligent control power supply 100 sends instructions to the cascade constant current voltage division control chips 300), the data modulator inside the intelligent control power supply 100 is responsible for generating the downlink data signal .

[0089] S202: As a specific implementation, the downlink modulation can use amplitude shift keying (ASK). The data modulator superimposes a specific frequency on the basis of a tiny current pulse to represent digital "1", and no superimposed pulse to represent digital "0". In another implementation, frequency shift keying (FSK) can also be used by switching the tiny perturbation frequency on the bus to represent different digital logic.

[0090] S203: All cascaded constant current voltage dividing control chips 300 in series on the loop continuously monitor the bus current . Its internal data demodulator (e.g. a band-pass filter, envelope detector and comparator) is responsible for extracting and decoding signal from , recovering digital instructions.

[0091] S204: Addressing logic unit of cascaded constant current voltage dividing control chip 300 compares the target address in the decoded instruction with the assigned by topology discovery and automatic addressing module 10. If the addresses match, the instruction is executed (e.g. dimming, or setting target voltage dividing value ).

[0092] S205: In the implementation of uplink communication (i.e. cascaded constant current voltage dividing control chip 300 reporting status or response signal to intelligent control power supply 100), load modulation technology is used.

[0093] S206: Cascaded constant current voltage dividing control chip 300 (node ) that needs to send data actively and temporarily changes its own equivalent input impedance through its internal uplink modulation circuit (e.g. a controlled, parallel or series switching impedance element ).

[0094] As a specific lower-level implementation, the switching impedance element in the uplink modulation circuit can be implemented as a controlled MOSFET switch . In one configuration, source and drain can be connected in series with a shunt resistor , and then connected in parallel as a whole to the DC / DC converter input of the cascaded constant current voltage dividing control chip 300 (i.e. connected in parallel between and ). When sending uplink data logic "1", the chip internal logic unit controls to be briefly turned on, connecting to the loop; when sending logic "0", it is kept off. In another configuration, ​The switching operating point of the DC / DC converter (S301) can also be directly and controllably altered at high frequency (e.g., by fine-tuning its duty cycle or switching frequency), thereby affecting its equivalent input impedance. The periodic changes. Both methods can achieve S207. Fluctuations, thereby achieving uplink load modulation.

[0095] S207: Due to the total impedance of the entire loop Follow Small fluctuations due to changes The intelligent control power supply maintains 100%. The total output voltage is constant. This will also generate a synchronous fluctuation. .

[0096] ;

[0097] .

[0098] S208: Data demodulation unit of the intelligent control power supply 100, configured to continuously monitor its own total output voltage. The AC component. The data demodulation unit captures this... The fluctuations are analyzed and decoded according to a preset uplink encoding protocol (e.g., a specific fluctuation frequency or code pattern) to recover the original signal from the source. Uplink data (e.g., topology discovery and automatic addressing module 10) Message, or intelligent fault diagnosis and controllable bypass module 50 information).

[0099] S209: To ensure communication reliability and addressing accuracy, downlink Generated with uplink communication The signals are all organized using a specific data frame structure.

[0100] S210: In one specific embodiment, the data frame structure may include: a start bit or preamble for clock synchronization, and an address field (bearing) for identifying the target node. ), a command field for defining operation types, and a data payload field for carrying specific parameters (such as brightness values, etc.). Values ​​or fault codes), and check fields (such as CRC or checksums) used to verify data integrity.

[0101] The cascaded voltage divider and dynamic power consumption balancing module 30 is the core component for realizing the automatic voltage tripping function of this invention. Its function is to adjust the total voltage provided by the intelligent control power supply 100. Actively and controllably allocated to serial links a cascaded constant current voltage dividing control chip 300.

[0102] In one specific embodiment, the physical implementation of the cascaded voltage dividing and dynamic power balancing module 30 is as follows:

[0103] S301: The cascaded constant current voltage dividing control chip 300 has a DC / DC (Direct Current / Direct Current) converter integrated inside. The DC / DC converter acts as a controllable active load in the constant current loop.

[0104] S302: Define the input voltage of the first cascaded constant current voltage dividing control chip 300 as Vbus, and the output voltage as Vout. The voltage intercepted or divided by the chip from the bus is defined as the voltage difference between its input and output:

[0105] ;

[0106] This is the input voltage of the DC / DC converter, which is used for the node-local constant current driving module 40.

[0107] S303: The constant current on the bus flows through the first node, and its voltage jumps from Vbus to Vbus-Vdrop1: This voltage then passes through the first segment of FPC line (with a parasitic resistance of R1) on the cascaded topology LED light strip 200, resulting in a line parasitic voltage drop:

[0108] .

[0109] S304: Therefore, the input voltage of the first cascaded constant current voltage dividing control chip 300 is:

[0110] .

[0111] S305: It can be deduced that the input voltage of the first cascaded constant current voltage dividing control chip 300 is the total voltage Vbus minus the sum of the voltage interception values of all upstream nodes and all upstream line voltage drops:

[0112] ; ​​​​​​​​​​​​​​​​

[0113] in, The total output voltage of the intelligent control power supply 100.

[0114] S306: Due to the intelligent control power supply 100 output It is a constant and relatively small value designed to minimize line parasitic voltage drop. It is also a constant and small value. This characteristic makes the FPC line resistance of this system for a 200 series-topic LED strip very small. It is insensitive, which fundamentally solves the voltage drop problem of traditional parallel solutions.

[0115] The dynamic power balancing method of the cascaded voltage divider and dynamic power balancing module 30 aims to balance the power consumption of all components. The values ​​tend to be consistent, thereby enabling each node to capture power. The method may include the following steps:

[0116] S307: The intelligent control power supply 100 uses the topology discovery and automatic addressing module 10 to obtain the accurate total number of nodes. and its total output voltage Calculate an ideal target voltage distribution that is evenly distributed to each node. .

[0117] ;

[0118] (In practical applications, due to) much smaller This can be ignored or estimated as a margin to simplify calculations.

[0119] S308: The intelligent control power supply 100, through the downlink communication function of the power and data collaborative transmission module 20, transmits data to all... Each cascaded constant current voltage divider control chip broadcasts a target voltage divider command. .

[0120] S309: Each cascaded constant current voltage divider control chip 300 receives and decodes this... After the instruction, update the target voltage divider value stored internally to... .

[0121] S310: The DC / DC controller inside the cascaded constant current voltage divider control chip 300 activates an input voltage closed-loop control logic. This is a specific lower-level implementation of the present invention.

[0122] S311: In this control logic, the DC / DC controller does not directly control the current output to the LED (this task is taken care of by the node-local constant current driving module 40), but through an independent control loop, it monitors its own input voltage and output voltage in real time, so as to calculate the current actual voltage division value .

[0123] S312: The DC / DC controller compares with the stored , and according to the error between the two, it dynamically adjusts its equivalent impedance to the bus by adjusting the duty cycle or switching frequency of its switching tube and other control parameters.

[0124] S313: The final result of this adjustment is to make stabilize at value.

[0125] S314: Through the cooperation of S307 to S313, all cascade constant current voltage division control chips 300 actively adjust their own voltage division to around.

[0126] S315: Since the bus current is constant, the local power of each node is thus automatically balanced:

[0127] .

[0128] This dynamic power balancing mechanism ensures that no matter where the cascade constant current voltage division control chip 300 is located in the series link, the power it obtains is consistent, providing stable power input for the node-local constant current driving module 40 to achieve brightness uniformity.

[0129] The node-local constant current driving module 40 is arranged inside each cascade constant current voltage division control chip 300. Its function is to use the local node power intercepted and stabilized by the cascade voltage division and dynamic power balancing module 30 to provide a precisely controllable constant driving current for the local LED lamp bead load connected to the cascade constant current voltage division control chip 300.

[0130] In a specific embodiment, the working method of the node-local constant current driving module 40 can include the following steps:

[0131] S401: The node-local constant current driving module 40 receives the input power provided by the cascade voltage division and dynamic power balancing module 30 The power is:

[0132] ;

[0133] wherein, is the target voltage of the node after balancing, is the constant current of the bus.

[0134] S402: The physical implementation of the node-local constant-current driving module 40 is the second control loop (i.e., the output control loop) of the internal DC / DC converter of the cascaded constant-current voltage division control chip 300. The DC / DC converter (for example, a Buck step-down topology) steps down to drive the local LED lamp bead string (whose total forward conduction voltage is ). ).

[0135] S403: The output end of the DC / DC converter is connected in series with a current detection unit (for example, a low-resistance current sampling resistor ) for real-time monitoring of the actual current flowing through the local LED lamp bead string.

[0136] Alternatively, as another lower-level implementation, to improve efficiency and reduce power loss on , the current detection unit can also use a lossless current sampling technology. For example, the voltage drop of the power switch tube (for example, its low-side MOSFET) of the DC / DC converter (S402) in the on state can be monitored in real time to estimate , or a Hall-effect sensor can be used for non-contact current measurement.

[0137] S404: A "local constant-current control loop" is internally provided in the cascaded constant-current voltage division control chip 300. The loop includes an error amplifier that compares the actual current (or its equivalent voltage) fed back by the current detection unit with an internal current reference .

[0138] S405: The control logic unit (for example, a PWM generator) of the loop automatically adjusts the duty cycle of the DC / DC converter switch tube according to the output of the error amplifier, so that constantly tracks .

[0139] .

[0140] S406: The establishment of the local constant-current control loop makes it possible to ​The value of I depends only on the forward voltage of the local LED string , which varies with temperature or aging, ensuring the constancy of local brightness.

[0141] S407: The node-local constant-current driving module 40 is further responsible for executing the brightness adjustment instruction issued by the intelligent control power supply 100.

[0142] S408: The decoding unit of the cascaded constant-current voltage division control chip 300 extracts the target brightness value after receiving the downlink instruction (for example ) from the power and data co-transmission module 20.

[0143] S409: As a lower implementation (analog dimming), the internal logic of the cascaded constant-current voltage division control chip 300 can convert the target brightness value into an analog voltage or current, directly adjusting the size of the internal current reference in S404. That is . By changing , the control loop of S405 will automatically make stable at the new target current value, realizing brightness adjustment.

[0144] S410: As another lower implementation (PWM dimming), the internal current reference remains constant (for example, set to the current corresponding to the maximum brightness), and the control loop of S405 makes constant . At the same time, the internal logic converts into the duty cycle of a PWM (pulse width modulation) signal . The PWM signal is used to gate the enable terminal or output stage of the DC / DC converter at high frequency, so that high-speed switches between and 0, and its equivalent average current is:

[0145] ;

[0146] , thereby realizing digital dimming.

[0147] S411: The control (adjusting ) of the node-local constant-current driving module 40 and the control (stabilizing ) of the cascaded voltage division and dynamic power consumption balancing module 30 are two control loops that are mutually coordinated but functionally decoupled.

[0148] S412: When changes due to dimming, or changes due to temperature drift, the node-localized constant-current driving module 40 (S405) will first automatically adjust the DC / DC converter duty cycle to maintain constant. This adjustment will cause changes in the DC / DC converter input impedance, which in turn causes attempt to deviate . At this time, the control loop of the cascaded voltage division and dynamic power balancing module 30 (S311) will immediately intervene and adjust the duty cycle again to make forced to return to . The two loops work together to ensure that local dimming operations do not interfere with the balanced distribution of bus power.

[0149] The intelligent fault diagnosis and controllable bypass module 50 functions to ensure the robustness of the series topology architecture of the present application. When a local fault occurs in one of the cascaded constant-current voltage division control chips 300 in the series link, the module can diagnose and report the fault, and accurately bypass the faulty node according to instructions, thereby ensuring the integrity of the entire constant-current loop and the normal operation of the remaining healthy nodes.

[0150] In a specific embodiment, the working method of the intelligent fault diagnosis and controllable bypass module 50 can include the following steps:

[0151] S501: The cascaded constant-current voltage division control chip 300 internally integrates a fault self-checking unit. This unit continuously monitors the working state of the cascaded constant-current voltage division control chip 300 itself and its local LED load.

[0152] S502: As a lower implementation, the fault self-checking unit can monitor the state including:

[0153] Local LED load open-circuit state : By monitoring the output current of the node-localized constant-current driving module 40 , when the module is instructed to drive but continuously zero or below a preset lower limit, it is judged as open-circuit.

[0154] Local LED load short-circuit state : By monitoring the voltage across the local LED load , when in the driving state but continuously below a preset lower limit (e.g. close to 0V), it is judged as short-circuit.

[0155] Chip overheat state : Through internal integrated temperature sensor (e.g. temperature measurement circuit based on bandgap reference), when the chip junction temperature is monitored to exceed a preset protection threshold , it is judged as overheating.

[0156] Other states, such as chip under / over voltage lockout ).

[0157] S503: When the fault self-checking unit detects not normal state, the cascaded constant current voltage dividing control chip 300 does not immediately execute bypass action.

[0158] S504: The cascaded constant current voltage dividing control chip 300 (node ) will preferentially execute fault reporting. Its internal logic unit will generate a diagnostic message containing its own logic address and specific fault code .

[0159] .

[0160] S505: The cascaded constant current voltage dividing control chip 300 sends the diagnostic message to the intelligent control power supply 100 using the uplink communication mechanism of the power and data co-transmission module 20 (e.g. load modulation technology of S205).

[0161] S506: The data demodulation unit of the intelligent control power supply 100 receives and decodes the message. The central controller of the intelligent control power supply 100 learns the accurate address of the fault node and its fault type accordingly.

[0162] S507: The central controller of the intelligent control power supply 100 executes central decision. The controller can record the fault information for subsequent maintenance prompt. And, the controller decides to execute bypass for the fault node according to the preset fault handling strategy (e.g. judging or as non-recoverable hardware fault, must bypass) or responding to external management instruction.

[0163] S508: The central controller of the intelligent control power supply 100 sends a bypass execution instruction to the specific fault node through the downlink communication mechanism of the power and data co-transmission module 20.

[0164] .

[0165] S509: The fault node The cascaded constant current voltage dividing control chip 300 receives and decodes the instruction. After confirming that the address matches and the instruction is "Enable", the chip activates its internal bypass execution mechanism.

[0166] S510: The bypass execution mechanism is a controllable bypass switch . As a specific lower-level implementation, the controllable bypass switch is a solid-state switching element with low on-resistance , such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT (Insulated Gate Bipolar Transistor).

[0167] S511: The controllable bypass switch is connected in such a way that its two ends are connected to the main current input terminal (voltage ) and the main current output terminal (voltage ) of the cascaded constant current voltage dividing control chip 300, forming a parallel connection with the internal DC / DC converter (i.e., the main body of the cascaded voltage dividing and dynamic power consumption balancing module 30 and the node localization constant current driving module 40).

[0168] In a preferred embodiment, to further enhance the robustness of the system and respond to the case of catastrophic open-circuit failure of the cascaded constant current voltage dividing control chip 300 itself (such as complete failure of the chip logic unit, unable to respond to the bypass instruction of S508), the intelligent fault diagnosis and controllable bypass module 50 can also include a passive bypass element. The passive bypass element can be a Zener Diode or a TVS (Transient Voltage Suppression) diode, which is also connected in parallel between the main current input terminal and the main current output terminal of the chip (i.e., in parallel with the controllable bypass switch ). In normal operation, the breakdown voltage of the passive bypass element is designed to be significantly higher than the target voltage dividing value of the node (for example, it can be set to ). Therefore, when the chip is working normally or being actively bypassed by S512, the voltage is always lower than , and the passive bypass element is in a high-resistance state and does not conduct. However, if the internal circuit (such as the DC / DC converter) of the node occurs a physical open circuit, and the active bypass function of S512 fails, the bus constant current will be forced to flow to the passive bypass element, causing to rise sharply. When exceeds ​At that time, the passive bypass element will undergo avalanche breakdown and be forcibly turned on, thereby providing... It provides a low-impedance path to ensure the entire series loop remains unbroken. This passive bypass mechanism can work in conjunction with the S510's active controllable bypass mechanism to provide dual fault protection.

[0169] S512: When the controllable bypass switch When activated (conducted) by an S509 instruction, it and A low impedance is formed between them ( )path.

[0170] S513: Constant current on the bus This will bypass the DC / DC converter circuit inside the faulty chip, and instead pass through the conductive... Switch, from Direct flow to And continue to flow downstream node.

[0171] S514: This faulty node The DC / DC converter itself stops working because it is bypassed (the local LED is off), and the voltage it intercepts is... sudden drop to This value is close to 0V.

[0172] S515: Due to The continuity of the loop was maintained, and all the others... The operation, communication, and brightness of a healthy cascaded constant current voltage divider control chip 300 are unaffected by a single faulty node, thus ensuring the availability and reliability of the entire system. This intelligent bypass method of diagnosis-reporting-decision-instruction-execution avoids the false triggering or information black box problems that may be caused by traditional passive bypass (such as Zener diode bypass).

[0173] To further illustrate the collaborative working process of the technical solution of this invention, a specific working scenario example will be used below.

[0174] See attached document Figure 2 , Figure 2 This is a schematic diagram of a collaborative workflow in a specific working scenario according to an embodiment of the present invention.

[0175] The application scenario of this embodiment is ultra-long-distance building outline lighting. For example, it is necessary to provide uniform and controllable LED lighting for a 100-meter-long continuous curtain wall outline of a building.

[0176] In the prior art, when using the traditional low-voltage constant-voltage (for example, DC 24V) parallel LED light strip scheme, a serious line voltage drop problem will be encountered. A transmission distance of 100 meters will result in a voltage at the end (remote end) of the light strip that is much lower than that at the near end, so that the brightness at the end is significantly darker than that at the near end, and uniform illumination cannot be achieved. To solve this problem, the prior art has to use a multi-point access power supply or use an extremely thick (high cost, difficult to install) cable, and cannot achieve intelligent control and fault diagnosis of a single node.

[0177] The system of the present application is used to solve the above-mentioned difficulties.

[0178] In this embodiment, the deployment scheme is as follows: only one intelligent control power supply 100 is installed at one end (for example, the ground or the power distribution room) of the 100-meter light strip. A whole 100-meter long series topology LED light strip 200 is laid along the building contour. On the series topology LED light strip 200, a total of 500 (i.e. ) cascade constant current voltage division control chips 300 are pre-integrated at an interval of, for example, 20 cm.

[0179] The specific working process of the system in this scenario is as follows:

[0180] The system is powered on. The intelligent control power supply 100 injects a constant current through its high-voltage constant current output end to the series topology LED light strip 200.

[0181] At the same time, the topology discovery and automatic addressing module 10 is activated. The intelligent control power supply 100 broadcasts a "topology discovery" instruction (for example, ). The instruction is transmitted downstream step by step (for example, ) from the first (for example, ) cascade constant current voltage division control chip 300 along the series link. Each cascade constant current voltage division control chip 300 registers itself as in turn when receiving the instruction, until the last cascade constant current voltage division control chip 300 (for example, ) registers itself as .

[0182] The cascade constant current voltage division control chip 300 (for example, ) confirms itself as the end of the link if it does not detect a downstream node within a preset timeout period. Subsequently, it sends a "link end confirmation" message containing the total number of nodes to the intelligent control power supply 100 using the uplink communication function (for example, load modulation) of the power and data co-transmission module 20.

[0183] After receiving the message, the intelligent control power supply 100 knows that the accurate length of the current link is .

[0184] The intelligent control power supply 100 then starts the cascaded voltage division and dynamic power consumption balancing module 30. Assuming that the total output voltage of the intelligent control power supply 100 is 300V, its internal controller calculates the ideal target voltage division of each node . .

[0185] The intelligent control power supply 100 broadcasts a "set target voltage division" instruction to all 500 nodes through the downlink communication function of the power and data collaborative transmission module 20 .

[0186] After receiving the instruction, all 500 cascaded constant current voltage division control chips 300 activate their internal input voltage closed-loop control logic and actively adjust themselves to stabilize the voltage intercepted from the bus at 0.6V .

[0187] While stabilizing at 0.6V, the node-localized constant current drive module 40 inside each cascaded constant current voltage division control chip 300 starts working, using 's power to provide a preset constant drive current for its local LED lamp beads .

[0188] As a result, all LED nodes from the near end ( ) to the far end ( ) achieve completely uniform brightness lighting over a distance of 100 meters, unaffected by the resistance differences of FPC lines.

[0189] On this basis, if dynamic lighting effects (such as water flow effect) are needed, the intelligent control power supply 100 can continuously send dimming instructions for specific addresses through the power and data collaborative transmission module 20. For example, it sends , , ... at the same time, lowering the brightness of the already lit nodes. The node-localized constant current drive module 40 of each cascaded constant current voltage division control chip 300 accurately responds to the instructions addressed to itself, adjusting 's size, thereby achieving complex dynamic visual effects on a 100-meter long strip.

[0190] During the long-term operation of the system, assuming that the local LED lamp beads of the cascaded constant current voltage division control chip 300 at position No. 315 ( ) are burned out due to an open circuit.

[0191] The intelligent fault diagnosis and controllable bypass module 50 immediately detects Fault state. The chip will not be bypassed immediately, but will send a diagnostic message to the intelligent control power supply 100 through the uplink communication of the power and data co-transmission module 20 .

[0192] The central controller of the intelligent control power supply 100 receives the message and learns that the open-circuit fault occurs at the 315th node, and can record this information in the log or report to the management platform.

[0193] The intelligent control power supply 100 immediately determines that the fault needs to be isolated, and then sends a bypass execution instruction to the specific node through downlink communication .

[0194] After receiving and decoding the instruction, the 315th cascaded constant current voltage dividing control chip 300 activates the controllable bypass switch in it .

[0195] Controllable bypass switch is turned on, and the bus constant current is directly introduced from the input end of the output end of the chip, bypassing the internal DC / DC circuit of the chip.

[0196] As a result, the 315th node is extinguished, but the entire current loop remains intact. The power supply, communication and brightness display of the remaining 499 nodes (including the 1-314th nodes upstream and the 316-500th nodes downstream) are completely unaffected, and the system continues to operate stably.

[0197] This embodiment fully illustrates how the system of the present application achieves the technical effects of single-end power supply, uniform brightness, intelligent control and active fault isolation in an ultra-long distance application scenario through the coordinated work of the five modules, effectively overcoming the limitations of the prior art.

[0198] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An intelligent LED strip power supply control system with automatic voltage tripping function, comprising an intelligent control power supply, a series-topology LED strip, and a plurality of cascaded constant current voltage divider control chips disposed on the series-topology LED strip, characterized in that, The system also includes: The topology discovery and automatic addressing module is used to detect the total number of nodes of the plurality of cascaded constant current voltage divider control chips when the system is powered on, and to assign a unique logical address to each cascaded constant current voltage divider control chip; A cascaded voltage divider and dynamic power consumption balancing module is used by the intelligent control power supply to calculate the target voltage divider value based on the total number of nodes; The power and data collaborative transmission module is used to enable the intelligent control power supply to broadcast the target voltage division value to the plurality of cascaded constant current voltage divider control chips on the same power supply bus carrying DC power, and to realize bidirectional data communication based on the logical address; A node-localized constant current drive module is set inside each of the cascaded constant current voltage divider control chips. It is used to receive the target voltage divider value and adjust the internal DC / DC converter accordingly so that the actual voltage divider value intercepted by the chip approaches the target voltage divider value. Then, it uses the power corresponding to the actual voltage divider value to provide a constant drive current for the local LED beads. The intelligent fault diagnosis and controllable bypass module is used by each cascaded constant current voltage divider control chip to report fault information containing its own logical address through bidirectional data communication when a local fault is detected, and to respond to the bypass command issued by the intelligent control power supply and addressed to its own logical address, so as to activate the internal controllable bypass switch.

2. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 1, characterized in that, The topology discovery and automatic addressing module includes: The intelligent control power supply broadcasts an initial address allocation instruction; The first cascaded constant current voltage divider control chip receives the initial address allocation instruction, binds its own logical address, and generates a new address allocation instruction by incrementing the address value in the instruction and forwarding it downstream. Subsequent cascaded constant current voltage divider control chips repeat the receiving, binding, incrementing, and forwarding process. When the last cascaded constant current voltage divider control chip does not detect a downstream response within a preset timeout period, it confirms itself as the end of the link and reports a link end confirmation message containing the total number of nodes to the intelligent control power supply.

3. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 1, characterized in that, The power and data coordinated transmission module includes: The intelligent control power supply achieves downlink communication by superimposing a high-frequency AC data component onto a constant DC component. The cascaded constant current voltage divider control chip achieves uplink communication by actively changing its own equivalent input impedance, causing synchronous fluctuations in the total voltage at the output of the intelligent control power supply. The data demodulation unit of the intelligent control power supply decodes the uplink communication data signal by monitoring the fluctuation of the total voltage at the output terminal.

4. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 1, characterized in that, The cascaded voltage divider and dynamic power balancing module includes: The intelligent control power supply calculates the target voltage division value based on the total number of nodes and its own total output voltage; Each of the cascaded constant current voltage divider control chips receives and stores the target voltage divider value; Each cascaded constant current voltage divider control chip activates an input voltage closed-loop control logic, which monitors the input and output voltages of the chip in real time and calculates the actual voltage division value. The input voltage closed-loop control logic compares the actual voltage division value with the target voltage division value, and adjusts the control parameters of the internal DC / DC converter according to the error, so that the actual voltage division value is stabilized at the target voltage division value.

5. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 4, characterized in that, The node-localized constant current driver module includes: The cascaded constant current voltage divider control chip has a DC / DC converter with a current detection unit inside, which is used to monitor the actual driving current flowing through the local LED in real time. The cascaded constant current voltage divider control chip has a local constant current control loop inside, which compares the actual drive current with an internal current reference. The local constant current control loop automatically adjusts the control parameters of the DC / DC converter based on the comparison error, so that the actual drive current constantly tracks the internal current reference.

6. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 1, characterized in that, The intelligent fault diagnosis and controllable bypass module includes: The cascaded constant current voltage divider control chip integrates a fault self-test unit to monitor the working status of the local LED load, including the local LED load open circuit state, local LED load short circuit state, or chip overheating state. When the cascaded constant current voltage divider control chip detects a fault, it generates a diagnostic message containing its own logical address and fault code, and prioritizes fault reporting. The intelligent control power supply receives the diagnostic message and executes the central decision; The intelligent control power supply sends an execution bypass instruction to the logical address in the downstream direction; Upon receiving the bypass command, the cascaded constant current voltage divider control chip that malfunctions activates the controllable bypass switch.

7. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 5, characterized in that, The input voltage closed-loop control logic inside the cascaded constant current voltage divider control chip works in conjunction with the local constant current control loop. The local constant current control loop prioritizes adjusting the DC / DC converter to maintain the actual drive current constant. The input voltage closed-loop control logic then intervenes to adjust the DC / DC converter so that the actual voltage divider value is forced to stabilize back to the target voltage divider value.

8. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 3, characterized in that, The cascaded constant current voltage divider control chip changes the equivalent input impedance through an internal controlled switching impedance element; The switching impedance element is controlled to be briefly turned on or off, or the operating point of the DC / DC converter is controlled to be changed, so as to cause periodic changes in the equivalent input impedance, thereby realizing load modulation of the uplink data.

9. The intelligent LED strip power supply control system with automatic voltage tripping function according to claim 6, characterized in that, The intelligent fault diagnosis and controllable bypass module also includes a passive bypass element. The passive bypass element and the controllable bypass switch are connected in parallel between the main current input terminal and the main current output terminal of the cascaded constant current voltage divider control chip; The breakdown voltage of the passive bypass element is set to be higher than the target voltage divider value, and is used to force conduction to maintain the bus current loop when the cascaded constant current voltage divider control chip experiences a catastrophic open circuit and the controllable bypass switch fails.

10. The intelligent LED strip power control system with automatic voltage tripping function according to claim 2, characterized in that, After forwarding the new address allocation instruction, the last cascaded constant current voltage divider control chip starts an internal timer; The last cascaded constant current voltage divider control chip triggers a response timeout event because it does not receive a valid response from the downstream within the preset timeout period, and thereby confirms itself as the end of the link.

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