An address burning system and method for parallel-connected LEDs

Abstract

This application belongs to the field of LED technology, and discloses an address burning system and method for parallel-connected LEDs. The system includes a control module, a power supply module, and a welding module. The control module is configured to, after receiving a start instruction, sequentially send a power supply instruction to the power supply module, send a burning instruction to the parallel-connected lamp string, send a power-off instruction to the power supply module, and send a welding instruction to the welding module. The welding module is configured to, when receiving the welding instruction from the control module, clamp the LED module and the parallel-connected lamp string for welding, and send a start instruction to the control module after the welding is completed. The LED module is configured to, after receiving the burning instruction, determine whether address data is stored. If not, obtain address data according to the burning instruction and burn the address data. This application can avoid address writing errors of the LED module, reduce the internal algorithm redundancy of the LED module, and reduce production costs.

Description

Technical Field

[0001] The present application relates to the field of LED technology, and in particular to an address recording system and method for parallel LEDs. Background Art

[0002] Parallel LEDs are widely used in the production of LED displays or light strips because the normal operation of other LEDs will not be affected by the damage of some LEDs. However, in order to achieve individual control of each LED in a parallel network, each LED must be coded with a unique address. Currently, there are two main ways to code parallel LED beads: one is before SMD soldering, and the other is after the SMD is completed, by designing an algorithm inside the LED beads.

[0003] However, if the address is burned before the LED is mounted, it is easy for the internal address sequence of the mounted LED to be wrong, such as missing sequence, disordered sequence or address duplication, resulting in low LED production efficiency; and improving the internal software of each LED lamp bead will increase the cost of a single lamp bead, which is not suitable for the application of large-scale LED products. In addition, for LED lamp beads, the internal coding program is generally only used in the production stage, resulting in algorithm redundancy in the application stage. Summary of the invention

[0004] The present application provides an address recording system and method for parallel LEDs, which can avoid LED module address writing errors, while reducing the internal algorithm redundancy of the LED module and reducing production costs.

[0005] In a first aspect, an embodiment of the present application provides an address burning system for parallel LEDs, comprising a control module, a power supply module and a welding module; the control module is used to sequentially send a welding instruction to the welding module, send a power supply instruction to the power supply module, send a burning instruction to the parallel light string, and send a power-off instruction to the power supply module after receiving a start instruction;

[0006] The welding module is used to clamp the LED module and the parallel light string for welding when receiving the welding instruction from the control module; after the welding is completed, a start instruction is sent to the control module;

[0007] The power supply module is used to send a working voltage signal to the parallel light string when receiving a power supply instruction; stop sending the working voltage signal when receiving a power-off instruction; the LED module is used to determine whether address data is stored after receiving a burning instruction; if not, obtain the address data according to the burning instruction and burn the address data.

[0008] Furthermore, the system also includes a signal detection module;

[0009] The signal detection module is arranged on the welding module and connected to the control module;

[0010] The control module is further configured to send a first control instruction to the parallel lamp strings after sending the power supply instruction; and send a burning instruction to the parallel lamp strings after receiving the induction signal from the signal detection module;

[0011] The signal detection module is configured to send an induction signal to the control module according to the detected optical signal;

[0012] The LED module is further configured to be lit according to the first control instruction after receiving the first control instruction.

[0013] Further, the control module is further configured to send a second control instruction to the parallel lamp strings after sending the burning instruction; and send a power-off instruction to the power supply module after receiving the induction signal from the signal detection module;

[0014] The LED module is further configured to determine whether the control address in the second control instruction is equal to the stored address data after receiving the second control instruction; if so, it is lit according to the second control instruction.

[0015] Further, the control module is further configured to send the first control instruction to the signal detection module;

[0016] The signal detection module is specifically configured to obtain a signal fluctuation threshold according to the first control instruction; calculate the difference between the optical signal peak values at two adjacent moments within a preset time period; wherein, the preset time period is centered on the moment of receiving the first control instruction; determine whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate an induction signal according to the difference and send the induction signal to the control module.

[0017] Further, the control module is further configured to send the second control instruction to the signal detection module;

[0018] The signal detection module is specifically configured to obtain a signal fluctuation threshold according to the second control instruction; calculate the difference between the optical signal peak values at two adjacent moments within a preset time period; wherein, the preset time period is centered on the moment of receiving the second control instruction; determine whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate an induction signal according to the difference and send the induction signal to the control module.

[0019] Further, the control module is further configured to obtain the current working current value of the parallel lamp strings and the historical working current value recorded after the first control instruction was sent and the induction signal was received when the first control instruction is sent and the induction signal is received; calculate a first current increment value according to the current working current value and the historical working current value; determine whether the first current increment value is within a first preset current range; if so, send a burning instruction to the parallel lamp strings.

[0020] Further, the control module is further configured to, when the first current increment value is greater than the first preset current range, obtain the working voltage signal and the historical voltage signal of the power supply module; compare the working voltage signal and the historical voltage signal based on the wavelet transform algorithm, and if there is a mutation in the working voltage signal, send a power update instruction to the power supply module, otherwise generate a string of lamp failure prompt information;

[0021] The power supply module is configured to, after receiving the power update instruction, obtain an updated voltage signal according to the power update instruction, and replace the working voltage signal with the updated voltage signal.

[0022] Further, the control module is further configured to, when the first current increment value is less than the first preset current range, detect whether there is a repeated welding mark; if there is, generate a string of lamp failure prompt information; if not, generate a repeated welding mark, and sequentially send a power-off instruction to the power supply module and a repeated welding instruction to the welding module;

[0023] The welding module is further configured to, after receiving the repeated welding instruction, weld the LED module again.

[0024] Further, the control module is further configured to, after sending the burning instruction, obtain the initial current value of the parallel string of lamps;

[0025] When sending the second control instruction and receiving the induction signal, obtain the target current value of the parallel string of lamps;

[0026] Obtain a second current increment value according to the initial current value and the target current value;

[0027] Judge whether the second current increment value is within the first preset current range;

[0028] If so, send a power-off instruction to the power supply module; if not, generate a string of lamp failure prompt information.

[0029] Further, the system further includes a spectral detection module disposed above the welding module;

[0030] The spectral detection module is respectively connected to the control module and the signal detection module; the control module is further configured to send the second control instruction to the spectral detection module; receive the color rendering index of the spectral detection module, and judge whether the color rendering index is greater than the preset color difference threshold; if so, generate a string of lamp failure prompt information; if not, send a power-off instruction to the power supply module;

[0031] The signal detection module is further configured to send the induction signal corresponding to the second control instruction to the spectral detection module;

[0032] The spectral detection module is configured to obtain the target color rendering parameters according to the second control instruction;

[0033] After receiving the induction signal, measure the actual color rendering parameters of the received optical signal; take the difference between the target color rendering parameters and the actual color rendering parameters as the color rendering index; send the color rendering index to the control module.

[0034] Further, the welding module is also used to send a test voltage signal to the LED module before welding the LED module; calculate the load of the LED module according to the test voltage signal and the test current of the LED module and send it to the control module;

[0035] The control module is also used to obtain the working voltage signal of the power supply module and determine the first preset current range corresponding to the LED module according to the working voltage signal and the load.

[0036] Further, the control module is also used to determine whether the address data in the burning instruction is equal to the preset welding threshold after sending the burning instruction; if not, after sending a power-off instruction to the power supply module, send a welding instruction to the welding module.

[0037] Further, the power supply module adopts a Boost-Buck power structure; the spectral detection module adopts a spectrophotometer.

[0038] In a second aspect, an embodiment of the present application provides a method for burning addresses of parallel-connected LEDs, including:

[0039] The control module sends a welding instruction to the welding module;

[0040] The welding module receives the welding instruction from the control module, clamps the LED module and the parallel-connected lamp string for welding; after welding is completed, sends a start instruction to the control module;

[0041] The control module sends a power supply instruction to the power supply module after receiving the start instruction;

[0042] When the power supply module receives the power supply instruction, it sends a working voltage signal to the parallel-connected lamp string;

[0043] The control module sends a burning instruction to the parallel-connected lamp string;

[0044] After receiving the burning instruction, the LED module determines whether it stores address data; if not, obtains the address data according to the burning instruction and burns the address data;

[0045] The control module sends a power-off instruction to the power supply module;

[0046] When the power supply module receives the power-off instruction, it stops sending the working voltage signal.

[0047] Further, the method further includes:

[0048] After sending the power supply instruction, the control module sends a first control instruction to the parallel-connected lamp string;

[0049] After receiving the first control instruction, the LED module is lit according to the first control instruction;

[0050] The signal detection module sends an induction signal to the control module according to the detected optical signal;

[0051] When receiving the induction signal, the control module sends a burning instruction to the parallel lamp string.

[0052] Furthermore, the method further includes:

[0053] After sending the burning instruction, the control module sends a second control instruction to the parallel lamp string;

[0054] The LED module receives the second control instruction and determines whether the control address in the second control instruction is equal to the stored address data; if so, it is lit according to the second control instruction;

[0055] The signal detection module sends an induction signal to the control module according to the detected optical signal;

[0056] After receiving the induction signal, the control module sends a power-off instruction to the power supply module.

[0057] Furthermore, the method further includes:

[0058] The control module sends the first control instruction to the signal detection module;

[0059] The signal detection module obtains a signal fluctuation threshold according to the first control instruction; calculates the difference between the optical signal peak values at two adjacent moments within a preset time period; wherein, the preset time period is centered on the moment of receiving the first control instruction;

[0060] The signal detection module determines whether the difference is greater than or equal to the signal fluctuation threshold; if so, generates an induction signal according to the difference and sends the induction signal to the control module.

[0061] Furthermore, the method further includes:

[0062] When the control module sends the first control instruction and receives the induction signal, it obtains the current working current value of the parallel lamp string and the historical working current value recorded after sending the first control instruction and receiving the induction signal last time;

[0063] Calculates a current increment value based on the current working current value and the historical working current value;

[0064] Determines whether the first current increment value is within a first preset current range; if so, sends a burning instruction to the parallel lamp string.

[0065] Furthermore, the method further includes:

[0066] When the current increment value is greater than the first preset current range, the control module acquires the working voltage signal and the historical voltage signal of the power supply module; based on the wavelet transform algorithm, the working voltage signal and the historical voltage signal are compared. If there is a mutation in the working voltage signal, a power supply update instruction is sent to the power supply module;

[0067] After receiving the power supply update instruction, the power supply module obtains the updated voltage signal according to the power supply update instruction and replaces the working voltage signal with the updated voltage signal.

[0068] Furthermore, the method further includes:

[0069] After sending the burning instruction, the control module acquires the initial current value of the parallel lamp string;

[0070] When sending the second control instruction and receiving the induction signal, the target current value of the parallel lamp string is acquired;

[0071] The second current increment value is obtained according to the initial current value and the target current value;

[0072] It is judged whether the second current increment value is within the first preset current range;

[0073] If so, a power-off instruction is sent to the power supply module; if not, a lamp string fault prompt message is generated.

[0074] Furthermore, the method further includes:

[0075] The control module sends the second control instruction to the spectral detection module;

[0076] The spectral detection module obtains the target color rendering parameter according to the second control instruction;

[0077] The signal detection module sends the induction signal corresponding to the second control instruction to the spectral detection module;

[0078] After receiving the induction signal, the spectral detection module measures the actual color rendering parameter of the received optical signal; the difference between the target color rendering parameter and the actual color rendering parameter is sent to the control module as the color rendering index;

[0079] The control module receives the color rendering index of the spectral detection module and judges whether the color rendering index is greater than the preset color difference threshold. If so, a lamp string fault prompt message is generated; if not, a power-off instruction is sent to the power supply module.

[0080] In summary, compared with the prior art, the beneficial effects brought by the technical solution provided by the embodiment of the present application at least include:

[0081] A parallel LED address burning system provided by an embodiment of the present application can perform the production and coding of parallel lamp strings simultaneously through the coordinated operation of a welding module, a power supply module, and a control module. That is, for each welded LED module, coding is performed simultaneously. After the coding is completed, the next LED module is welded. The above system can not only avoid the sequencing errors that may occur in the existing method of coding first and then pasting, but also reduce the algorithm redundancy inside the LED module and lower the production cost. That is, the present application only needs the LED module to perform the judgment and processing of one address data, without designing too many processing procedures as in the existing address writing methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 FIG. is a structural diagram of a parallel LED address burning system provided by an exemplary embodiment of the present application.

[0083] Figure 2 FIG. is a structural diagram of a parallel LED address burning system provided by another exemplary embodiment of the present application.

[0084] Figure 3 FIG. is a structural diagram of a parallel LED address burning system provided by another exemplary embodiment of the present application.

[0085] Figure 4 FIG. is a flowchart of a parallel LED address burning method provided by an exemplary embodiment of the present application.

[0086] Figure 5 FIG. is a pin package diagram of the first three-wire LED module provided by an exemplary embodiment of the present application.

[0087] Figure 6 FIG. is a pin package diagram of the second three-wire LED module provided by an exemplary embodiment of the present application.

[0088] Figure 7 FIG. is a connection schematic diagram of the first three-wire LED parallel lamp string provided by an exemplary embodiment of the present application.

[0089] Figure 8 FIG. is a connection schematic diagram of the second three-wire LED parallel lamp string provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0090] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0091] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0092] Please refer to Figure 1 Figure 1 , an address burning system for parallel LEDs provided by an embodiment of the present application includes a control module, a power supply module, and a welding module; the control module is configured to sequentially send a power supply instruction to the power supply module, a burning instruction to the parallel lamp string, a power-off instruction to the power supply module, and a welding instruction to the welding module after receiving a start instruction.

[0093] The welding module is configured to clamp the LED module and the parallel lamp string for welding when receiving the welding instruction from the control module; and send a start instruction to the control module after welding is completed.

[0094] Specifically, when the control module sends each instruction, it needs to wait for the previous instruction to be sent successfully, and even can wait for a preset duration (such as 1 ms or 2 ms) after the previous instruction is sent successfully before sending the next instruction.

[0095] It should be noted that the address data stored in the burning instruction needs to be incremented one by one, that is, the address data in each burning instruction sent is obtained by adding 1 to the address data in the previous burning instruction.

[0096] Further, the control module is further configured to determine whether the address data in the burning instruction is equal to a preset welding threshold after sending the burning instruction; if not, then send a welding instruction to the welding module after sending a power-off instruction to the power supply module.

[0097] Specifically, the present application can set the length of the parallel lamp string, that is, the preset welding threshold. When the address data in the burning instruction sent by the control module reaches the preset welding threshold, it means that the number of LED modules in the parallel lamp string has reached the requirement, and welding can be stopped. At this time, after sending the power-off instruction, an end prompt message can be generated to remind the staff to reset the process of the burning system. After receiving the reset instruction, the control module starts working again from sending the welding instruction.

[0098] The power supply module is configured to send a working voltage signal to the parallel lamp string when receiving the power supply instruction; and stop sending the working voltage signal when receiving the power-off instruction; the LED module is configured to determine whether address data is stored after receiving the burning instruction; if not, then obtain the address data according to the burning instruction and burn the address data.

[0099] Specifically, the working voltage signal is a power signal that can start all LED modules in the parallel lamp string to work. The power supply module, like the control module, is connected to one end of the parallel lamp string, that is, the input end of the first LED module.

[0100] Since each LED module in the parallel-connected lamp string is connected in parallel, when the control module sends a burning instruction, all LED modules, including the newly soldered ones, can receive it. Therefore, a process for judging address data needs to be added inside the LED module. If there is no address data, it means it is a newly soldered LED module, and it can be burned according to the address data in the burning instruction.

[0101] It can be understood that many existing address burning methods are realized through information interaction between the MCU and each LED module after the parallel-connected lamp string is generated. This often requires designing many algorithm processes in the LED module. In fact, the algorithm process of address burning is basically only used in the production stage. In the formal use stage, the LED module will only be driven and lit according to the burned address. This will result in a low utilization rate of most algorithm programs in the LED module and a large amount of redundancy.

[0102] The address burning system of the present application realizes the burning process in the control module. The control module is fixed in the address burning system and continuously serves the production and address burning of each parallel-connected lamp string, without generating program redundancy.

[0103] An address burning system for parallel-connected LEDs provided by the above embodiment can enable the production and coding of the parallel-connected lamp string to be carried out simultaneously through the cooperation of the welding module, the power supply module and the control module, that is, every time an LED module is soldered, coding is carried out at the same time, and after the coding is completed, the next LED module is soldered; the above system can not only avoid the sequencing error that may occur when writing first and then pasting, but also reduce the algorithm redundancy inside the LED module and reduce the production cost. That is, the present application only needs the LED module to perform a judgment process on one address data, without designing too many processing processes as in the existing address writing methods.

[0104] Please refer to Figure 2 , in some embodiments, the system further includes a signal detection module.

[0105] The signal detection module is arranged on the welding module and is connected to the control module.

[0106] It can be understood that before receiving the welding instruction, the welding module will always maintain the corresponding relationship with the newly soldered LED module and will only clamp the new LED module after receiving the welding instruction; therefore, the signal detection module arranged on the welding module can enable the signal detection module to always correspond to the newly soldered LED module before the control module sends the welding instruction.

[0107] The control module is further configured to send a first control instruction to the parallel-connected lamp string after sending the power supply instruction; and send a burning instruction to the parallel-connected lamp string after receiving the induction signal of the signal detection module.

[0108] The signal detection module is used to send an induction signal to the control module according to the detected optical signal.

[0109] The LED module is also used to light up according to the first control instruction after receiving the first control instruction.

[0110] Among them, the first control instruction is the instruction that the parallel lamp string will receive and use in formal applications. The brightness and color that the LED module needs to light up will be written in the first control instruction. The LED module drives the three-color lamp beads to light up with different powers according to the first control instruction. This part utilizes the common mechanism of the LED module and there will be no redundancy.

[0111] It can be understood that during the production process of the parallel lamp string, due to production yield problems, some LED modules may have some quality hazards, such as damaged lamp beads, damaged chips, etc. In order to ensure the quality of the generated parallel lamp string, before burning the address of the newly welded LED module, the LED module is made to light up through the first control instruction; since there is no stored address data in the new LED module at this time, the function of the first control instruction at this time is to make each LED module that receives the first control instruction light up, and the signal detection module only corresponds to the newly welded LED module. Therefore, if the signal detection module generates an induction signal, it means that the newly welded LED module can receive and execute the instruction and can proceed to the next step of address burning.

[0112] The above embodiment can preliminarily screen the quality of the LED modules welded to the parallel lamp string by adding a signal detection module, avoid welding LED modules with quality problems, and ensure the production quality of the parallel lamp string.

[0113] In some embodiments, the control module is also used to send a second control instruction to the parallel lamp string after sending the burning instruction; after receiving the induction signal from the signal detection module, it sends a power-off instruction to the power supply module.

[0114] After sending the power-off instruction, the control module sends a welding instruction to the welding module.

[0115] The LED module is also used to judge whether the control address in the second control instruction is equal to the stored address data after receiving the second control instruction; if so, it lights up according to the second control instruction.

[0116] Among them, the nature of the second control instruction is similar to that of the first control instruction. Both are common control instructions for the LED module in the formal application stage. Different from the first control instruction, the second control instruction also includes a control address. Only when the stored address data is equal to this control address, the LED module will control three different-color lamp beads to light up according to the driving information (including the brightness, color, etc. to be displayed) corresponding to the control address in the second control instruction.

[0117] It can be understood that, except for situations such as lamp bead damage and chip damage, if there is a problem with the storage unit used to store address data in the LED module, it will also cause the LED module to be out of control in the formal application stage. However, if there is a problem with the storage unit of the address, it cannot be detected under the first control instruction of the above embodiment.

[0118] Therefore, after sending the burning instruction to the newly welded LED module, this application sends the second control instruction to determine whether the LED module has correctly burned the address data and whether it can decode and execute the second control instruction according to the address data; if the LED module can normally execute the second control instruction to light up, the signal detection module will generate an induction signal, and after receiving the induction signal, the control module will send a power-off instruction and weld the next LED module.

[0119] In the specific implementation process, in order to further improve the production efficiency of the parallel lamp strings, a preset response time limit for the induction signal can also be added to the control module. If no induction signal is received within the preset response time limit after sending the first control instruction or the second control instruction, it indicates that there is a problem with the LED module, and a lamp string fault prompt message is generated.

[0120] The above embodiment conducts a targeted lighting test on the newly welded LED module again after sending the burning instruction, further ensuring that the quality of the LED module is good and ensuring the production quality of the parallel lamp strings.

[0121] In some embodiments, the control module is also used to send the first control instruction to the signal detection module.

[0122] The signal detection module is specifically used to obtain the signal fluctuation threshold according to the first control instruction; calculate the difference between the peak values of the optical signals at two adjacent moments within a preset time period; where the preset time period is centered on the moment of receiving the first control instruction; determine whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate an induction signal according to the difference and send the induction signal to the control module.

[0123] Specifically, although the signal detection module can generate an induction signal by detecting the change of the optical signal, the detection of the optical signal is greatly affected by environmental changes. The light change in the production workshop, the shadow caused by the movement of the staff, etc. will all affect the judgment of the optical signal by the signal detection module. Therefore, in this application, the control module sends the first control instruction to the signal detection module, and the signal detection module can obtain the brightness to be achieved by the LED module according to the driving information in the first control instruction, so as to obtain the signal fluctuation threshold of the optical signal corresponding to this brightness; if the peak change of the optical signal exceeds the signal fluctuation threshold, it indicates that the change of the optical signal at this time is caused by the lighting of the LED module corresponding to the signal detection module, then an induction signal is generated and sent to the control module, so as to avoid the wrong feedback of the signal detection module caused by tiny light changes.

[0124] At the same time, considering that there may be a difference in the time required for the LED module and the signal detection module to decode the first control instruction, in this application, the signal detection module takes the moment when the first control instruction is received as the central moment, and extends a preset response time limit before and after to form a preset time period. The optical signal change detected within the preset time period is the control result of the first control instruction.

[0125] Similarly, the control module can also be used to send a second control instruction to the signal detection module.

[0126] Specifically, the signal detection module is used to obtain the signal fluctuation threshold according to the second control instruction; calculate the difference between the optical signal peaks at two adjacent moments within the preset time period; where the preset time period takes the moment when the second control instruction is received as the center; judge whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate an induction signal according to the difference and send the induction signal to the control module.

[0127] Specifically, the signal detection module calculates the signal fluctuation threshold for the second control instruction and the first control instruction respectively, indicating that the brightness of controlling the lighting of the lamp string by the control module and the brightness of controlling the lighting of a single LED module can be different, which is applicable to the situation where the calibrated working parameters of each LED module on the parallel lamp string are different, and improves the flexibility of lamp string production.

[0128] In some embodiments, the control module is further configured to, when sending the first control instruction and receiving the induction signal, obtain the current working current value of the parallel lamp string and the historical working current value recorded after sending the first control instruction and receiving the induction signal last time; calculate the first current increment value according to the current working current value and the historical working current value; judge whether the first current increment value is within the first preset current range; if so, send a burning instruction to the parallel lamp string.

[0129] Specifically, although the setting of the signal fluctuation threshold in the above embodiments can improve the detection accuracy of the signal detection module, the detection of optical signals actually cannot completely eliminate the influence of ambient light, and the stability is slightly poor. Therefore, the present application further adds a current monitoring mechanism on the basis of the signal detection module, that is, after receiving the induction signal, the control module further determines whether the new LED module is working properly through the first current increment value.

[0130] When a parallel branch is added to the parallel lamp string and the working voltage signal remains unchanged, the current on the bus is the sum of the currents of each parallel branch. Therefore, if the newly welded LED module is lit according to the working voltage signal, the current on the bus will change, that is, the first current increment value. The present application further determines whether the first current increment value is greater than the first preset current range, which can avoid the influence of the current fluctuation of other LED modules on the detection of the newly welded LED module.

[0131] After the signal detection module detects the change of the optical signal in the above embodiment, further judging the current working current value on the bus of the parallel lamp string can further improve the accuracy of the quality inspection of the LED module.

[0132] In some embodiments, the control module is further configured to obtain the working voltage signal and the historical voltage signal of the power supply module when the first current increment value is greater than the first preset current range; compare the working voltage signal and the historical voltage signal based on the wavelet transform algorithm, and if there is a mutation in the working voltage signal, send a power update instruction to the power supply module, otherwise generate a lamp string fault prompt message.

[0133] The power supply module is configured to obtain an updated voltage signal according to the power update instruction after receiving the power update instruction, and replace the working voltage signal with the updated voltage signal.

[0134] Among them, being greater than the first preset current range means being less than the maximum value in the first preset current range.

[0135] Specifically, if the first current increment value is greater than the first preset current range when only one LED module is newly welded, there may be three situations: 1. The power supply of the power supply module is unstable, resulting in an increase in the working current of a single LED module; 2. There are situations such as virtual soldering and short circuit in the parallel lamp string; 3. The specification of the newly welded LED module is incorrect.

[0136] Therefore, when the control module detects that the first current increment value is greater than the first preset current range, it first obtains the current working voltage signal of the power supply module, analyzes the current working voltage signal based on the historical voltage signal, and determines whether the current working voltage signal has mutated. If so, the current increase situation can be solved by instructing the power supply module to update the working voltage signal; if it is not a mutation of the working voltage signal, then it is the second case, and a lamp string fault prompt message needs to be generated to remind the staff to handle it. Among them, the wavelet transform algorithm belongs to a common signal analysis algorithm, and its calculation process will not be elaborated here.

[0137] The above embodiment analyzes the working voltage signal when detecting an increase in the current of the LED module, and checks for unstable power supply situations that occur during the long-term operation of the power supply module.

[0138] In some embodiments, the control module is further configured to detect whether there is a repeated welding mark when the first current increment value is less than the first preset current range; if it exists, a lamp string fault prompt message is generated; if it does not exist, a repeated welding mark is generated, and a power-off instruction is sent to the power supply module in sequence, and a repeated welding instruction is sent to the welding module;

[0139] The welding module is further configured to weld the LED module again after receiving the repeated welding instruction.

[0140] Among them, being less than the first preset current range means being less than the minimum value in the first preset current range; the LED module to be welded again is the LED module corresponding to the previous welding instruction, and no new LED module is clamped for welding. After the welding module welds the LED module again, a start instruction is sent to the control module.

[0141] Specifically, if the control module receives an induction signal but the first current increment value is less than the first preset current range, it may indicate three situations: 1. The newly welded LED module is not completely welded and has not received any instruction signals, and the induction signal is caused by environmental light changes; 2. The newly welded LED module does not light up due to its own fault, and the induction signal is caused by environmental light changes; 3. The newly welded LED module lights up normally, and there is a fault in other LED modules in the parallel lamp string.

[0142] Therefore, this application makes the welding module weld the LED module again to rule out the first case; after repeated welding, start judging from the power supply instruction and the first control instruction again. If the first current increment value is still less than the first preset current range, it indicates that the problem is not with the welding, but the second or third case (in fact, on the premise that the signal detection module senses the change of the optical signal according to the first control instruction, the possibility that the signal detection module generates an induction signal due to the change of ambient light is very small. Therefore, if it is the second case, after repeated welding, the control module will probably generate a lamp string fault prompt message because it still cannot receive the induction signal and will not perform the subsequent current detection). Therefore, a lamp string fault prompt message can be generated to remind the staff to check which LED module in the parallel lamp string has a fault and replace it.

[0143] It can be understood that during the production process of the parallel lamp string, due to the production yield problem, the service life of individual LED modules may be extremely short. And this application cycles to light up the parallel lamp string during the address burning stage, which can also indirectly screen out these LED modules with extremely short service life, that is, the above-mentioned third case.

[0144] In the above embodiment, when the first current increment value is less than the first preset current range, an additional operation of repeated welding is added to troubleshoot welding problems, avoid wasting LED modules, and indirectly improve production efficiency.

[0145] Furthermore, the control module is also used to obtain the initial current value of the parallel lamp string after sending the burning instruction; obtain the target current value of the parallel lamp string when sending the second control instruction and receiving the induction signal; obtain the second current increment value according to the initial current value and the target current value; judge whether the second current increment value is within the first preset current range; if so, send a power-off instruction to the power supply module; if not, generate a lamp string fault prompt message.

[0146] Among them, both the first current increment value and the second current increment value are obtained by subtracting the corresponding two current values.

[0147] Because at this time, there should be only the power of the newly welded LED module. Therefore, if the second current increment value is not within the first preset current range, it may indicate the following three cases: 1. The LED module is lit but has the wrong specifications; 2. The LED module fails to light up due to a fault, and the induction signal is caused by ambient light; 3. There are problems such as virtual soldering and short circuit in the parallel lamp string; None of the above three cases can be solved by the control module itself. Therefore, a lamp string fault prompt message can be directly generated.

[0148] The control module in the above embodiment tests the LED module to be burned based on the second current increment value after sending the burning instruction, further improving the detection accuracy of the LED module and the parallel lamp string.

[0149] Please refer to Figure 3 , in some embodiments, the system further includes a spectral detection module disposed above the welding module.

[0150] Among them, the spectral detection module can specifically adopt a spectrophotometer or an automatic optical inspection (AOI) technology based on machine vision. The spectral detection module is disposed above the welding module and corresponds to the newly welded LED module.

[0151] The spectral detection module is respectively connected to the control module and the signal detection module; the control module is further configured to send a second control instruction to the spectral detection module; receive the color rendering index of the spectral detection module, and determine whether the color rendering index is greater than a preset color difference threshold; if so, generate a string failure prompt message; if not, send a power-off instruction to the power supply module.

[0152] The signal detection module is further configured to send the induction signal corresponding to the second control instruction to the spectral detection module.

[0153] The spectral detection module is configured to obtain a target color rendering parameter according to the second control instruction.

[0154] After receiving the induction signal, the spectral detection module measures the actual color rendering parameter of the received optical signal; takes the difference between the target color rendering parameter and the actual color rendering parameter as the color rendering index; and sends the color rendering index to the control module.

[0155] Specifically, the signal detection module can screen out LED modules with insufficient brightness, but cannot identify whether the color display of the LED module meets the standard. The LED module realizes different color light displays by controlling the brightness of three-color lamp beads. If a certain lamp bead is damaged or there is a bug in the algorithm for adjusting the PWM signal duty cycle inside the LED module, it will cause the displayed color to be different from the color required in the second control instruction. In this case, even if the LED module can be controlled to light up, it will affect the display effect of the entire lamp string and reduce the quality of the lamp string.

[0156] Therefore, the present application further adds a spectral detection module; this module obtains the target color rendering parameters that the LED module needs to achieve through the second control instruction; the target color rendering parameters include the values of three color channels, namely R, G, and B; then, after the signal detection module generates an induction signal, that is, after detecting that the LED module is lit, it measures the actual color rendering parameter of the optical signal at this time, and sends the difference between the two color rendering parameters to the control module; also considering the influence of ambient light, the control module uses a preset color difference threshold to determine whether the color rendering parameter is within the allowable error range; if the color rendering parameter is greater than the preset color difference threshold, it means that the color difference of this LED module will be very obvious in actual display and cannot be used continuously.

[0157] The above embodiments implement the detection of the display color difference of the LED module during the production process of the lamp string based on the spectral detection module, screening out the LED modules with unqualified color differences, and further improving the production quality of the lamp string.

[0158] In some embodiments, the welding module is further configured to send a test voltage signal to the LED module before welding the LED module; calculate the load of the LED module according to the test voltage signal and the test current of the LED module and send it to the control module.

[0159] The control module is further configured to obtain the working voltage signal of the power supply module, and determine the first preset current range corresponding to the LED module according to the working voltage signal and the load.

[0160] Specifically, when the welding module clamps the LED module, it can clamp each pin thereof, and obtain the load of the LED module by sending a test voltage signal. The control module then sets the first preset current range used in current judgment according to its load; doing so can not only screen out unqualified LED modules in advance through the test current, improving production efficiency; but also be compatible with multiple different specifications of LED modules on a parallel lamp string, greatly enhancing the diversity and flexibility of the parallel lamp string while achieving precise quality screening during the production process.

[0161] In some embodiments, the power supply module adopts a Boost-Buck power structure.

[0162] Specifically, since the control module needs to perform quality screening and address burning on each LED module welded, this poses a challenge to the stability of the working voltage signal for each power supply. In this application, the power supply module is made to adopt a Boost-Buck power structure to supply power to the parallel lamp string. Boost serves as a stable voltage source, which can ensure the voltage drop requirements accumulated by multiple LED lamp strings. Buck serves as a stable current source, directly driving the LED to emit light. This structure is conducive to platform design, reducing the number of peripheral devices and the cost of the bill of materials (BOM), while improving the system energy efficiency and reducing heat generation.

[0163] Please refer to Figure 4 , another embodiment of this application provides a method for burning addresses of parallel LEDs, including:

[0164] Step S11, the control module sends a welding instruction to the welding module.

[0165] Step S12, the welding module receives the welding instruction from the control module, clamps the LED module and the parallel lamp string for welding; and sends a start instruction to the control module after welding is completed.

[0166] Step S13: After receiving the start instruction, the control module sends a power supply instruction to the power supply module.

[0167] Step S14: When receiving the power supply instruction, the power supply module sends a working voltage signal to the parallel lamp string.

[0168] Step S15: The control module sends a burning instruction to the parallel lamp string.

[0169] Step S16: After receiving the burning instruction, the LED module determines whether address data is stored; if not, it obtains the address data according to the burning instruction and burns the address data.

[0170] Step S17: The control module sends a power-off instruction to the power supply module.

[0171] Step S18: When receiving the power-off instruction, the power supply module stops sending the working voltage signal.

[0172] Specifically, after executing step S18, it returns to step S11.

[0173] Furthermore, the method further includes:

[0174] After sending the power supply instruction, the control module sends a first control instruction to the parallel lamp string.

[0175] After receiving the first control instruction, the LED module is lit according to the first control instruction.

[0176] The signal detection module sends an induction signal to the control module according to the detected optical signal.

[0177] When receiving the induction signal, the control module sends a burning instruction to the parallel lamp string.

[0178] Furthermore, the method further includes:

[0179] After sending the burning instruction, the control module sends a second control instruction to the parallel lamp string.

[0180] After receiving the second control instruction, the LED module determines whether the control address in the second control instruction is equal to the stored address data; if so, it is lit according to the second control instruction.

[0181] The signal detection module sends an induction signal to the control module according to the detected optical signal.

[0182] When receiving the induction signal, the control module sends a power-off instruction to the power supply module.

[0183] Furthermore, the method further includes:

[0184] The control module sends the first control instruction to the signal detection module.

[0185] The signal detection module obtains a signal fluctuation threshold according to the first control instruction; calculates the difference between the peak values of optical signals at two adjacent moments within a preset time period; wherein, the preset time period is centered on the moment when the first control instruction is received.

[0186] The signal detection module determines whether the difference is greater than or equal to the signal fluctuation threshold; if so, generates an induction signal according to the difference and sends the induction signal to the control module.

[0187] Further, the method further includes:

[0188] When the control module sends the first control instruction and receives the induction signal, it obtains the current working current value of the parallel lamp string and the historical working current value recorded after the first control instruction was sent last time and the induction signal was received.

[0189] Calculates a current increment value based on the current working current value and the historical working current value.

[0190] Determines whether the first current increment value is within a first preset current range; if so, sends a burning instruction to the parallel lamp string.

[0191] Further, the method further includes:

[0192] When the current increment value is greater than the first preset current range, the control module obtains the working voltage signal and the historical voltage signal of the power supply module; compares the working voltage signal and the historical voltage signal based on the wavelet transform algorithm. If there is a mutation in the working voltage signal, it sends a power supply update instruction to the power supply module.

[0193] After receiving the power supply update instruction, the power supply module obtains an updated voltage signal according to the power supply update instruction and replaces the working voltage signal with the updated voltage signal.

[0194] Further, the method further includes:

[0195] After the control module sends the burning instruction, it obtains the initial current value of the parallel lamp string.

[0196] When the second control instruction is sent and the induction signal is received, it obtains the target current value of the parallel lamp string.

[0197] Obtains a second current increment value based on the initial current value and the target current value.

[0198] Determines whether the second current increment value is within the first preset current range.

[0199] If so, sends a power-off instruction to the power supply module; if not, generates a lamp string fault prompt message.

[0200] Further, the method further includes:

[0201] The control module sends a second control instruction to the spectral detection module;

[0202] The spectral detection module obtains the target color rendering parameter according to the second control instruction;

[0203] The signal detection module sends the induction signal corresponding to the second control instruction to the spectral detection module;

[0204] After receiving the induction signal, the spectral detection module measures the actual color rendering parameter of the received optical signal; and takes the difference between the target color rendering parameter and the actual color rendering parameter as the color rendering index and sends it to the control module;

[0205] The control module receives the color rendering index of the spectral detection module, judges whether the color rendering index is greater than the preset color difference threshold. If so, it generates a fault prompt message for the lamp string; if not, it sends a power-off instruction to the power supply module.

[0206] For the specific limitations of the method for burning addresses of parallel LEDs provided in this embodiment, reference can be made to the embodiment of the address burning system for parallel LEDs in the foregoing text, which will not be elaborated herein.

[0207] Please refer to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , this application also provides several packaging structures for three-wire LED modules.

[0208] Among them, GND is the ground pin, DIN is the data input pin, and VDD is the power supply pin.

[0209] In the parallel lamp string of this application, the DIN pins of each LED module are connected to the data bus, one end of the data bus is connected to the output end of the control module, the VDD pins of each LED module are connected to the power supply bus, and one end of the power supply bus is connected to the output end of the power supply module. NC is a floating pin. The surface of the encapsulation body of the LED module is a layer of transparent epoxy resin, which can be made into different shapes to control the light emission angle and achieve better lighting or display effects.

[0210] When the welding module welds the LED module, it connects its DIN, VDD and GND to the bus of the lamp string.

[0211] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0212] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A parallel LED address recording system, characterized in that: It includes a control module, a power supply module and a welding module; The control module sends a welding instruction to the welding module, and after receiving a welding module start instruction, sequentially sends a power supply instruction to the power supply module, sends a burning instruction to the parallel light string, and sends a power-off instruction to the power supply module; The welding module is used to clamp the LED module and the parallel light string for welding when receiving the welding instruction from the control module; after the welding is completed, a start instruction is sent to the control module; The power supply module is used to send a working voltage signal to the parallel light string when receiving the power supply instruction; and stop sending the working voltage signal when receiving the power-off instruction; The LED module is used to determine whether address data is stored after receiving the burning instruction; if not, obtain the address data according to the burning instruction and burn the address data.

2. The address recording system for parallel LEDs according to claim 1, characterized in that: It also includes a signal detection module; the signal detection module is arranged on the welding module and connected to the control module; The control module is also used to send a first control instruction to the parallel light string after sending the power supply instruction; and send the burning instruction to the parallel light string after receiving the sensing signal from the signal detection module; The signal detection module is used to send a sensing signal to the control module according to the detected light signal; The LED module is further configured to light up according to the first control instruction after receiving the first control instruction.

3. The address recording system for parallel LEDs according to claim 2, characterized in that: The control module is also used to send a second control instruction to the parallel light string after sending the burning instruction; and send the power-off instruction to the power supply module after receiving the sensing signal from the signal detection module; The LED module is also used to determine whether the control address in the second control instruction is equal to the stored address data after receiving the second control instruction; if so, light up according to the second control instruction.

4. The address recording system for parallel LEDs according to claim 3, characterized in that: The control module is also used to send the first control instruction to the signal detection module; The signal detection module is specifically used to obtain a signal fluctuation threshold according to the first control instruction; calculate the difference between the optical signal peak values ​​at two adjacent moments within a preset time period; wherein the preset time period is centered on the moment of receiving the first control instruction; determine whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate the sensing signal according to the difference, and send the sensing signal to the control module.

5. The address recording system for parallel LEDs according to claim 3, characterized in that: The control module is also used to send the second control instruction to the signal detection module; The signal detection module is specifically used to obtain a signal fluctuation threshold according to the second control instruction; calculate the difference between the optical signal peak values ​​at two adjacent moments within a preset time period; wherein the preset time period is centered on the moment of receiving the second control instruction; determine whether the difference is greater than or equal to the signal fluctuation threshold; if so, generate the sensing signal according to the difference, and send the sensing signal to the control module.

6. The address recording system for parallel LEDs according to claim 3, characterized in that: The control module is further configured to obtain, when sending the first control instruction and receiving the sensing signal, the current working current value of the parallel light string and the historical working current value recorded after the first control instruction was sent and the sensing signal was received last time; Calculate a first current increment value according to the current working current value and the historical working current value; determine whether the first current increment value is within a first preset current range; If yes, the burning instruction is sent to the parallel light string.

7. The address recording system for parallel LEDs according to claim 6, characterized in that: The control module is also used to obtain the working voltage signal and the historical voltage signal of the power supply module when the first current increment value is greater than the first preset current range; compare the working voltage signal and the historical voltage signal based on the wavelet transform algorithm, and if there is a sudden change in the working voltage signal, send a power supply update instruction to the power supply module, otherwise generate a light string fault prompt information; The power supply module is used to obtain an update voltage signal according to the power update instruction after receiving the power update instruction, and replace the working voltage signal with the update voltage signal.

8. The address recording system for parallel LEDs according to claim 6, characterized in that: The control module is further used to detect whether there is a repeated welding mark when the first current increment value is less than the first preset current range; If it exists, a light string fault prompt message is generated; if it does not exist, a repeated welding mark is generated, and the power-off instruction is sent to the power supply module and the repeated welding instruction is sent to the welding module in sequence; The welding module is further used to weld the LED module again after receiving the repeated welding instruction.

9. The address recording system for parallel LEDs according to claim 6, characterized in that: The control module is also used to obtain the initial current value of the parallel light string after sending the burning instruction; When the second control instruction is sent and the induction signal is received, obtaining a target current value of the parallel light string; Obtaining a second current increment value according to the initial current value and the target current value; Determining whether the second current increment value is within the first preset current range; If yes, a power-off instruction is sent to the power supply module; If not, a light string fault prompt message is generated.

10. The address recording system for parallel LEDs according to claim 4, characterized in that: It also includes a spectrum detection module disposed on the welding module; the spectrum detection module is respectively connected to the control module and the signal detection module; The control module is also used to send the second control instruction to the spectrum detection module; receive the color rendering index of the spectrum detection module, and determine whether the color rendering index is greater than a preset color difference threshold; if so, generate a light string fault prompt message; if not, send the power-off instruction to the power supply module; The signal detection module is further used to send the sensing signal corresponding to the second control instruction to the spectrum detection module; The spectral detection module is used to obtain the target color rendering parameters according to the second control instruction; after receiving the sensing signal, measure the actual color rendering parameters of the received light signal; use the difference between the target color rendering parameters and the actual color rendering parameters as the color rendering index; and send the color rendering index to the control module.

11. The address recording system for parallel LEDs according to claim 6, characterized in that: The welding module is also used to send a test voltage signal to the LED module before welding the LED module; calculate the load of the LED module according to the test voltage signal and the test current of the LED module and send it to the control module; The control module is further used to obtain the working voltage signal of the power supply module, and determine a first preset current range corresponding to the LED module according to the working voltage signal, the load and a preset error.

12. The address recording system for parallel LEDs according to claim 1, characterized in that: The control module is also used to determine whether the address data in the burning instruction is equal to a preset welding threshold after sending the burning instruction; if not, after sending the power-off instruction to the power supply module, send a welding instruction to the welding module.

13. The address recording system for parallel LEDs according to claim 10, characterized in that: The power supply module adopts a Boost-Buck power supply structure; the spectrum detection module adopts a spectrophotometer.

14. A method for recording addresses of parallel LEDs, characterized in that: include: The control module sends a welding instruction to the welding module; The welding module receives the welding instruction from the control module, clamps the LED module and the parallel light string for welding; after the welding is completed, a start instruction is sent to the control module; After receiving the start-up instruction, the control module sends a power supply instruction to the power supply module; The power supply module sends a working voltage signal to the parallel light string when receiving the power supply instruction; The control module sends a burning instruction to the parallel light string; After receiving the burning instruction, the LED module determines whether the address data is stored; if not, obtains the address data according to the burning instruction and burns the address data; The control module sends a power-off instruction to the power supply module; When receiving the power-off instruction, the power supply module stops sending the working voltage signal.

15. The method for recording addresses of parallel LEDs according to claim 14, characterized in that: Also includes: After sending the power supply instruction, the control module sends a first control instruction to the parallel light string; After receiving the first control instruction, the LED module lights up according to the first control instruction; The signal detection module sends a sensing signal to the control module according to the detected light signal; When receiving the sensing signal, the control module sends the burning instruction to the parallel light string.

16. The method for recording addresses of parallel LEDs according to claim 15, characterized in that: Also includes: After sending the burning instruction, the control module sends a second control instruction to the parallel light string; The LED module receives the second control instruction, and determines whether the control address in the second control instruction is equal to the stored address data; If yes, lighting up according to the second control instruction; The signal detection module sends a sensing signal to the control module according to the detected light signal; After receiving the sensing signal, the control module sends the power-off instruction to the power supply module.

17. The method for recording addresses of parallel LEDs according to claim 15, characterized in that: Also includes: The control module sends the first control instruction to the signal detection module; The signal detection module obtains a signal fluctuation threshold according to the first control instruction; Calculating the difference between the peak values ​​of the optical signal at two adjacent moments within a preset time period; wherein the preset time period is centered on the moment when the first control instruction is received; The signal detection module determines whether the difference is greater than or equal to the signal fluctuation threshold; if so, generates the sensing signal according to the difference, and sends the sensing signal to the control module.

18. The method for recording addresses of parallel LEDs according to claim 16, characterized in that: Also includes: When the control module sends the first control instruction and receives the sensing signal, the control module obtains the current working current value of the parallel light string and the historical working current value recorded after the first control instruction was sent and the sensing signal was received last time; Calculate a first current increment value according to the current working current value and the historical working current value; Determining whether the first current increment value is within a first preset current range; If yes, the burning instruction is sent to the parallel light string.

19. The method for recording addresses of parallel LEDs according to claim 18, characterized in that: Also includes: The control module acquires the working voltage signal and the historical voltage signal of the power supply module when the current increment value is greater than the first preset current range; Compare the working voltage signal with the historical voltage signal based on a wavelet transform algorithm, and if there is a sudden change in the working voltage signal, send a power supply update instruction to the power supply module; After receiving the power update instruction, the power supply module obtains an update voltage signal according to the power update instruction, and replaces the working voltage signal with the update voltage signal.

20. The method for recording addresses of parallel LEDs according to claim 18, characterized in that: Also includes: After sending the burning instruction, the control module obtains the initial current value of the parallel light string; When the second control instruction is sent and the induction signal is received, obtaining a target current value of the parallel light string; Obtaining a second current increment value according to the initial current value and the target current value; Determining whether the second current increment value is within the first preset current range; If yes, a power-off instruction is sent to the power supply module; If not, a light string fault prompt message is generated.

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