Multi-LED lamp bead control system and control method thereof

Abstract

The invention discloses a multi-LED lamp bead control system and a control method thereof, and the system comprises a DC / DC converter which is used for outputting a constant current; the micro-control unit is used for outputting a control signal; the LED lamp comprises a plurality of LED modules, one or more PCB substrates, each PCB substrate is provided with a plurality of LED modules, each LED module is provided with at least two groups of LED units, each group of LED units comprises a plurality of LED lamp beads, and each group of LED units and the LED lamp beads in each group of LED units are connected in series and in parallel to form a grid loop; the switch unit, the DC / DC converter, the micro-control unit and the LED modules are all connected with the switch unit, and the switch unit is used for performing lamp bead brightness control on the PCB substrates according to the control signals. According to the invention, the circuit design cost can be reduced, a plurality of LED lamp beads can be flexibly controlled, and the method can be widely applied to the technical field of light control.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting control, and in particular to a control system for multiple LED lamp beads and a control method therefor. Background Art

[0002] With the booming development of new energy vehicles in China, there are various novel requirements for the shapes of vehicle headlights. The number of LEDs used is also increasing. LED lamp beads mainly use a driving chip to achieve stable current output. Due to the limitation of device usage specifications, usually each buck-boost DC / DC converter only drives 12 LED lamp beads. For example, the VF of each LED lamp bead is 3V, the output voltage of the buck-boost DC / DC converter is 36V, and the withstand voltage of the output filter capacitor is 50V. If the number of LED lamp beads increases, more buck-boost DC / DC converters are required, resulting in an increase in cost. Summary of the Invention

[0003] To solve the above technical problems, the object of the present invention is to provide a control system for multiple LED lamp beads and a control method therefor, which can reduce the circuit design cost.

[0004] To achieve the above object, one aspect of the embodiments of the present application provides a control system for multiple LED lamp beads, including:

[0005] A DC / DC converter for outputting a constant current;

[0006] A micro control unit for outputting a control signal;

[0007] One or more PCB substrates, on which a plurality of LED modules are provided, each of the LED modules is provided with at least two groups of LED units, each group of the LED units includes multiple LED lamp beads, and the LED lamp beads between each group of the LED units and within each group of the LED units form a grid circuit through a series-parallel connection method;

[0008] A switch unit, the DC / DC converter, the micro control unit, and each of the LED modules are all connected to the switch unit, and the switch unit is used to control the brightness of the lamp beads on each of the PCB substrates according to the control signal.

[0009] In some embodiments, the switch unit includes a plurality of FET channels, the number of the FET channels is equal to the number of the LED modules, and each of the FET channels is connected to one of the LED modules in a one-to-one correspondence.

[0010] In some embodiments, the FET channels are all field effect transistors, the gates of the field effect transistors are all connected to one end of all the LED units of the corresponding LED module, and the drains of the field effect transistors are all connected to the other end of all the LED units of the corresponding LED module.

[0011] In some embodiments, there are at least two PCB substrates, and each of the PCB substrates further includes a BIN resistor. One end of the BIN resistor is connected to the micro control unit, and the other end of the BIN resistor is grounded.

[0012] In some embodiments, the BIN levels of the bead brightness of at least two of the PCB substrates are different, and the resistance value of the BIN resistor on each of the PCB substrates corresponds to the BIN level of the bead brightness of the PCB substrate.

[0013] To achieve the above object, another aspect of the embodiments of the present application proposes a control method for a multi-LED bead control system, including the following steps:

[0014] Output a constant current through a DC / DC converter;

[0015] Output a control signal through a micro control unit;

[0016] Control the bead brightness of the PCB substrate through a switch unit according to the control signal;

[0017] Wherein, the PCB substrate is one or more, there are multiple LED modules on the PCB substrate, at least two groups of LED units are provided on each of the LED modules, each group of LED units includes multiple LED beads, and the LED units between each group and the LED beads within each group form a lattice circuit in a series-parallel manner.

[0018] In some embodiments, the PCB substrate is at least two, and controlling the bead brightness of the PCB substrate through the switch unit according to the control signal specifically includes:

[0019] When the BIN levels of the bead brightness of at least two of the PCB substrates are different, obtain the resistance value corresponding to the BIN resistor on the PCB substrate through the micro control unit, obtain the BIN level of the bead brightness of the PCB substrate according to the resistance value, and then output the control signal according to the BIN level of the bead brightness;

[0020] Adjust the duty cycle of the FET channel corresponding to the PCB substrate through the switch unit according to the control signal, so that the bead brightness of each PCB substrate is consistent.

[0021] In some embodiments, there is at least one PCB substrate, and the switch unit controls the brightness of the LED beads on the PCB substrate according to the control signal, which specifically includes:

[0022] When the luminous intensities of at least two of the LED modules are different, the micro-control unit outputs the control signal according to the luminous intensity;

[0023] The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that any brightness adjustment of the LED beads can be realized for each LED module.

[0024] In some embodiments, there is at least one PCB substrate, and the switch unit controls the brightness of the LED beads on the PCB substrate according to the control signal, which specifically includes:

[0025] When the LED bead colors of at least two of the LED modules are different, the micro-control unit outputs the control signal according to the LED bead color;

[0026] The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that any brightness adjustment of the LED beads can be realized for each LED module.

[0027] In some embodiments, there is at least one PCB substrate, and the switch unit controls the brightness of the LED beads on the PCB substrate according to the control signal, which specifically includes:

[0028] When the number of LED beads of at least two of the LED modules is different, the micro-control unit outputs the control signal according to the number of LED beads;

[0029] The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that any brightness adjustment of the LED beads can be realized for each LED module.

[0030] The beneficial effects of the present invention are as follows: A multi-LED-bead control system and its control method of the present invention include a DC / DC converter, a micro-control unit, one or more PCB substrates, and a switch unit. Multiple LED modules are provided on the PCB substrate, and at least two groups of LED units are provided on each LED module. Each group of LED units includes multiple LED beads. The LED beads between each group of LED units and within each group of LED units form a grid circuit through a series-parallel connection method. The present invention designs the LED beads on each PCB substrate to form a grid circuit, and the brightness control of multiple LED beads can be realized by one DC / DC converter and one switch unit, which can reduce the circuit design cost and flexibly control multiple LED beads. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following introduces the drawings required to be used in the embodiments of the present invention. It should be understood that the drawings introduced below only facilitate the clear expression of some embodiments of the technical solutions of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 Schematic diagram of the structure of a multi-LED lamp bead control system provided by an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the current when an LED lamp bead is open in an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the structure of a multi-LED lamp bead control system with different lamp bead brightness BIN levels provided by an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of the output current of a PCB substrate provided by an embodiment of the present invention;

[0036] Figure 5 Flowchart of the steps of a control method for a multi-LED lamp bead control system provided by an embodiment of the present invention;

[0037] Figure 6 Block diagram of the structure of a multi-LED lamp bead control system with different luminous intensities provided by an embodiment of the present invention;

[0038] Figure 7 Block diagram of the structure of a multi-LED lamp bead control system with different lamp bead colors provided by an embodiment of the present invention;

[0039] Figure 8 Block diagram of the structure of a multi-LED lamp bead control system with different numbers of lamp beads provided by an embodiment of the present invention. Detailed implementation manners

[0040] In order to make the objectives, technical solutions and advantages of the present application more clear, the following further describes the present application in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application detailed in the appended claims.

[0041] It will be understood that the terms "first", "second", etc. used in the present application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if", "when" as used herein may be interpreted as "when...", "while...", or "in response to determining".

[0042] The terms "at least one", "a plurality of", "each", "any one", etc. used in the present application, "at least one" includes one, two or more than two, "a plurality of" includes two or more than two, "each" refers to each one of the corresponding plurality, and "any one" refers to any one of the plurality.

[0043] Before the embodiments of the present application are described in detail, some nouns and terms involved in the embodiments of the present application are first described, and the nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0044] Buck-boost DC / DC converter: A power management chip that can simultaneously step up and step down and output a stable current;

[0045] Switch unit: A chip that integrates a bypass switch and is used to control the current switch;

[0046] Time-division multiplexing: The same buck-boost DC / DC converter outputs a constant current, and the switch unit divides the time when the LED lamp beads are lit according to requirements, so as to enable the same output current to meet the LED lamp beads with different current requirements;

[0047] Lamp bead brightness BIN level: The brightness intensity generated when the LED lamp bead emits light. LED lamp beads of the same model have different brightness levels, and different levels have inconsistent brightness intensities for the same current;

[0048] Light distribution N-1 regulation: For a single lamp equipped with more than one light source, when any one of its light sources fails, the remaining light sources (i.e., N-1 light sources) can still meet the requirements of the light distribution performance;

[0049] Lattice circuit: A circuit in which devices are connected in series and parallel like a grid;

[0050] PCB ASSY A: PCB substrate A, a finished product after the PCB blank board is loaded with components by SMT or DIP plug-in;

[0051] DUTY: Duty cycle, within a pulse cycle, the ratio of the energization time to the total time;

[0052] BIN resistor: A resistor that matches the BIN level of the brightness of the LED bead one by one, and is used for the microcontroller unit to confirm the brightness level of the LED bead.

[0053] With the booming development of new energy vehicles in China, there are various novel requirements for the shapes of vehicle lights. The number of LEDs used is also increasing. The LED beads mainly use a driving chip to achieve a stable current output. Due to the limitations of the device usage specifications, usually each buck-boost DC / DC converter only drives 12 LED beads. For example, the VF of each LED bead is 3V, the output voltage of the buck-boost DC / DC converter is 36V, and the withstand voltage of the output filter capacitor is 50V. If the number of LED beads increases, more buck-boost DC / DC converters are required, resulting in an increase in cost.

[0054] Therefore, the embodiment of the present invention proposes a multi-LED bead control system, including a DC / DC converter, a microcontroller unit, one or more PCB substrates, and a switch unit. A plurality of LED modules are provided on the PCB substrate, and at least two groups of LED units are provided on each LED module. Each group of LED units includes a plurality of LED beads. The LED beads between each group of LED units and within each group of LED units form a lattice circuit through a series-parallel connection method. In the present invention, the LED beads on each PCB substrate are designed to form a lattice circuit, and the brightness control of multiple LED beads can be achieved by one DC / DC converter and one switch unit, which can reduce the circuit design cost and flexibly control multiple LED beads.

[0055] Refer to Figure 1 , Figure 1 FIG.

[0056] A DC / DC converter, which is used to output a constant current;

[0057] A microcontroller unit, which is used to output a control signal;

[0058] One or more PCB substrates, on which a plurality of LED modules are provided. At least two groups of LED units are provided on each LED module. Each group of LED units includes a plurality of LED beads. The LED beads between each group of LED units and within each group of LED units form a lattice circuit through a series-parallel connection method;

[0059] A switch unit, the DC / DC converter, the microcontroller unit, and each LED module are all connected to the switch unit, and the switch unit is used to control the brightness of the LED beads on each PCB substrate according to the control signal.

[0060] Refer to Figure 1, further as an optional implementation, the switching unit includes multiple FET channels, the number of FET channels is equal to the number of LED modules, and each FET channel is connected to an LED module in a one-to-one correspondence.

[0061] Referring to Figure 1 , further as an optional implementation, the FET channels are all field effect transistors, the gates of each field effect transistor are connected to one end of all LED units of the corresponding LED module, and the drains of each field effect transistor are connected to the other end of all LED units of the corresponding LED module.

[0062] Specifically, the DC / DC converter in the embodiment of the present invention is a buck-boost type, and this buck-boost type DC / DC converter is used to provide a stable current output for the LED beads. It can, according to the input voltage and the required output current, through a power conversion circuit, achieve the functions of boosting or bucking, and ensure that the backend LED outputs a constant current;

[0063] The switching unit internally contains multiple FET channels, which are used to control the on / off states of each group of LED units on the PCB substrate by adjusting the duty cycle (DUTY) of each FET channel. In the embodiment of the present invention, it is designed that one PCB substrate corresponds to an independent FET channel to independently control each group of LED units, improving the flexibility and controllability of the system;

[0064] The micro control unit (MCU) exchanges data with the switching unit through serial communication (UART) and sends control signals. These control signals are used to tell the switching unit when to turn on or off a specific FET channel, so as to control the on / off states of the LED modules;

[0065] Such as Figure 1 The red frame part in is an LED module. The LED units on the LED module are composed of LED beads in a series-parallel manner to form a grid circuit, and the number of LEDs is a grid circuit with more than 2 groups of LED units in parallel. The parallel connection of the LED beads can control the voltage of the LED unit not to exceed the limit of the FET channel of the switching unit, so that each FET channel of the switching unit can control more LED beads.

[0066] It should be noted that since the LED loads are all grid circuits with 2 or more in parallel, in the design, it is ensured that when any one LED bead is open, the remaining LED beads can be normally lit, which can meet the N-1 regulation of light distribution. Such as Figure 2 The figure shows the current schematic diagram when the LED bead is open. Each LED bead is also connected in series with a current-sharing resistor. When the LED6 bead is open, the current can flow from the LED1 bead to the upper LED1 bead as indicated by the green arrow, ensuring that the remaining LED beads are normally lit and the remaining LED beads meet the light distribution requirements of the lamp.

[0067] Reference Figure 3 , Figure 3 As shown in Figure 3 , it is a schematic structural diagram of a multi-LED lamp bead control system with different lamp bead brightness BIN levels provided by an embodiment of the present invention. Further, as an optional implementation manner, there are at least two PCB substrates, and each PCB substrate also includes a BIN resistor. One end of the BIN resistor is connected to the micro control unit, and the other end of the BIN resistor is grounded.

[0068] Further, as an optional implementation manner, the lamp bead brightness BIN levels of at least two PCB substrates are different, and the resistance value of the BIN resistor on each PCB substrate corresponds to the lamp bead brightness BIN level of the PCB substrate.

[0069] In some optional embodiments, it is set that there are four PCB substrates (PCB substrate A, PCB substrate B, PCB substrate C, and PCB substrate D). The same model of LED lamp beads are mounted on each PCB substrate, but the lamp bead brightness BIN levels are inconsistent. And corresponding brightness BIN resistors are mounted on the PCB substrates according to the lamp bead brightness BIN levels of the LED lamp beads. For example, the lamp bead brightness BIN level of PCB-ASSY-A (PCB substrate A) is 1, and the resistance value of the BIN resistor on it is 30 kΩ; the lamp bead brightness BIN level of PCB-ASSY-B (PCB substrate B) is 2, and the resistance value of the BIN resistor on it is 9 kΩ.

[0070] In summary, the above is the structural description of the multi-LED lamp bead control system proposed by the embodiments of the present invention. Next, the functions of the multi-LED lamp bead control system will be described with examples.

[0071] As Figure 3 shown in the schematic structural diagram of the multi-LED lamp bead control system with different lamp bead brightness BIN levels, there are 160 LED lamp beads in the system. They are split into 4 PCB substrates according to the current required by the LED lamp beads, and there are 40 LED lamp beads on each PCB substrate. The DC / DC converter outputs a stable current for the rear-end LED lamp beads. The micro control unit communicates serially with the switch unit, and controls the FET channels inside the switch unit according to the duty cycle of each PCB substrate to adjust the power-on time of the LED lamp beads on each PCB substrate, realizing time-division multiplexing control of multiple LED lamp beads by a single DC / DC converter plus a switch unit. The specific control process is as Figure 4 shown. Each PCB substrate is lit separately according to the current magnitude. Among them, the duty cycle of PCB-ASSY-A (PCB substrate A) is 25%, the duty cycle of PCB-ASSY-B (PCB substrate B) is 23%, the duty cycle of PCB-ASSY-C (PCB substrate C) is 22%, and the duty cycle of PCB-ASSY-D (PCB substrate D) is 20%.

[0072] The structure and working principle of the multi-LED lamp bead control system according to the embodiments of the present invention are described above. It can be recognized that compared with the traditional LED lamp bead control system, the embodiments of the present invention have the following advantages:

[0073] I. Design the LED lamp beads on each PCB substrate to form a grid circuit. When any one LED lamp bead is open-circuited, the remaining LED lamp beads can be normally lit, which can meet the N-1 regulation of light distribution;

[0074] II. Use a DC / DC converter and a switch unit to achieve the brightness control of multiple LED lamp beads, which can reduce the number of DC / DC converters and switch units, and realize the control of multiple LED lamp beads at a very low driving cost.

[0075] Refer to Figure 5 , Figure 5 is the step flowchart of the control method for the multi-LED lamp bead control system provided by an embodiment of the present invention. The embodiments of the present invention provide a control method for the multi-LED lamp bead control system, which is used to control through the above multi-LED lamp bead control system, and includes the following steps S101 to S103:

[0076] S101. Output a constant current through the DC / DC converter;

[0077] S102. Output a control signal through the micro control unit;

[0078] S103. Control the brightness of the lamp beads on the PCB substrate through the switch unit according to the control signal;

[0079] Among them, the PCB substrate is one or more. Multiple LED modules are provided on the PCB substrate. At least two groups of LED units are provided on each LED module. Each group of LED units includes multiple LED lamp beads. The LED lamp beads between each group of LED units and within each group of LED units form a grid circuit through a series-parallel connection method.

[0080] Further as an optional implementation manner, the PCB substrate is at least two. The step of controlling the brightness of the lamp beads on the PCB substrate through the switch unit according to the control signal can be further divided into the following steps A1031 and A1032:

[0081] A1031. When the BIN levels of the lamp bead brightness of at least two PCB substrates are different, obtain the resistance value corresponding to the BIN resistor on the PCB substrate through the micro control unit, and obtain the BIN level of the lamp bead brightness of the PCB substrate according to the resistance value, and then output a control signal according to the BIN level of the lamp bead brightness;

[0082] A1032. The duty cycle of the FET channel corresponding to the PCB substrate is adjusted by the switching unit according to the control signal, so that the brightness of the LED beads on each PCB substrate is consistent.

[0083] Specifically, referring to Figure 3 , the LED beads have different brightness BIN levels. By identifying the BIN resistors on the PCB substrate through the microcontroller unit, the brightness BIN level of the LED beads on the PCB substrate can be confirmed. The microcontroller unit adjusts different duty cycles according to the LED beads with different brightness BIN levels.

[0084] Exemplarily, the same model of LED beads are mounted on PCB substrates A - D, but the brightness BIN levels of the LED beads are inconsistent, and corresponding BIN resistors are mounted on the PCB substrates according to the brightness BIN levels of the LED beads. For example, the brightness BIN level of the LED beads on PCB - ASSY - A (PCB substrate A) is 1, and the resistance value of the BIN resistor is 30 kΩ; the brightness BIN level of the LED beads on PCB - ASSY - B (PCB substrate B) is 2, and the resistance value of the BIN resistor is 9 kΩ. The microcontroller unit identifies the voltage division of the resistance values of the BIN resistors on each PCB substrate through the ADC, thereby determining the brightness BIN levels of the LED beads carried on different PCB substrates, and adjusting the duty cycle to the corresponding value, so that the LED beads with the same model but different brightness BIN levels carried on the PCB substrate can also ensure uniform brightness.

[0085] Further as an optional implementation manner, when there is at least one PCB substrate, the step of controlling the brightness of the LED beads on the PCB substrate by the switching unit according to the control signal can be further divided into the following steps B1031 and B1032:

[0086] B1031. When the luminous intensities of at least two LED modules are different, the microcontroller unit outputs a control signal according to the luminous intensity;

[0087] B1032. The duty cycle corresponding to the LED module is adjusted by the switching unit according to the control signal, so that any brightness adjustment of the LED beads can be achieved for each LED module.

[0088] Specifically, as Figure 6The following is a block diagram of a control system for multiple LED lamp beads with different luminous intensities provided by an embodiment of the present invention. When the output load is ≥1 PCB substrate and the number of LED modules on each PCB substrate is ≥2, LED lamp beads with different luminous intensities are mounted on each PCB substrate. For example, high-power LED lamp beads (high brightness) are used for high and low beams, and low-power LED lamp beads (low brightness) are used for position lights. High-brightness LED lamp beads require a larger current. The micro-control unit outputs a control signal according to the luminous intensity of each PCB substrate. The switching unit adjusts the duty cycle of the LED module to 40% according to the control signal. Low-brightness LED lamp beads require a smaller current. The switching unit adjusts the duty cycle of the LED module to 10% according to the control signal, thereby realizing the adjustment of any brightness.

[0089] Further, as an optional implementation manner, when the PCB substrate is at least one, the step of controlling the brightness of the lamp beads on the PCB substrate by the switching unit according to the control signal can be further divided into the following steps C1031 and C1032:

[0090] C1031. When the lamp bead colors of at least two LED modules are different, the micro-control unit outputs a control signal according to the lamp bead colors;

[0091] C1032. The switching unit adjusts the duty cycle corresponding to the LED module according to the control signal, so as to realize the adjustment of any brightness of the lamp beads of each LED module.

[0092] Specifically, as Figure 7 The following is a block diagram of a control system for multiple LED lamp beads with different lamp bead colors provided by an embodiment of the present invention. When the output load is ≥1 PCB substrate and the number of LED modules on each PCB substrate is ≥2, LED lamp beads with different colors are mounted on each PCB substrate. Different functions require different currents. For example, daytime running lamps (DRL), clearance lamps (CLL), and turn signals (TURN). The micro-control unit outputs a control signal according to the lamp bead colors of each PCB substrate. The switching unit adjusts the duty cycle corresponding to the daytime running lamps to 25% according to the control signal, adjusts the duty cycle corresponding to the clearance lamps to 5%, and adjusts the duty cycle corresponding to the turn signals to 25%, thereby realizing the adjustment of any brightness of different LED lamp bead colors.

[0093] Further, as an optional implementation manner, when the PCB substrate is at least one, the step of controlling the brightness of the lamp beads on the PCB substrate by the switching unit according to the control signal can be further divided into the following steps D1031 and D1032:

[0094] D1031. When the number of LED beads in at least two LED modules is different, the micro control unit outputs a control signal according to the number of LED beads;

[0095] D1032. The switch unit adjusts the duty ratio corresponding to the LED module according to the control signal, so as to realize arbitrary brightness adjustment of the LED beads of each LED module.

[0096] Specifically, as Figure 8 shown in the structural block diagram of the multi-LED bead control system with different numbers of LED beads provided by an embodiment of the present invention. When the output load is ≥1 PCB substrate and the number of LED modules on each PCB substrate is ≥2, the number of parallel LED unit groups (≥2) and the number of LED beads in each group on each PCB substrate are adjustable. By setting the duty ratio of the LED units on each PCB substrate through the micro control unit and the switch unit, arbitrary brightness adjustment of different numbers of LED beads is realized.

[0097] The control method of the multi-LED bead control system in the embodiment of the present invention is described above. It can be recognized that the embodiment of the present invention has the following advantages:

[0098] First, the LED beads on each PCB substrate are designed to form a grid circuit. When any one LED bead is open, the remaining LED beads can be normally lit, which can meet the N-1 regulation of light distribution;

[0099] Second, the brightness control of multiple LED beads is realized by one DC / DC converter and one switch unit, which can reduce the number of DC / DC converters and switch units and realize the control of multiple LED beads at a very low driving cost;

[0100] Third, it can adapt to LED beads with different brightness BIN levels, ensure uniform brightness, and can flexibly control multiple LED beads to realize arbitrary brightness adjustment of LED beads with different luminous intensities, or realize arbitrary brightness adjustment of LED beads with different colors, or realize arbitrary brightness adjustment of different numbers of LED beads.

[0101] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory. The above methods can be implemented in a computer program using standard programming techniques—including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. In addition, for this purpose the program is capable of running on a programmed application-specific integrated circuit.

[0102] In addition, the operations of the processes described herein can be performed in any suitable order, unless otherwise indicated herein or otherwise clearly contradicted by the context. The processes described herein (or variations and / or combinations thereof) can be executed under the control of one or more computer systems configured with executable instructions and can be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or by a combination thereof. The above computer programs include a plurality of instructions executable by one or more processors.

[0103] Furthermore, the above methods can be implemented in any type of computing platform operably connected, including but not limited to personal computers, minicomputers, mainframes, workstations, network or distributed computing environments, separate or integrated computer platforms, or communicating with charged particle tools or other imaging devices, etc. Aspects of the present invention can be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into the computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it can be read by a programmable computer and, when the storage medium or device is read by the computer, can be used to configure and operate the computer to perform the processes described herein. In addition, the machine-readable code, or portions thereof, can be transmitted via a wired or wireless network. When such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor, the inventions described herein include these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques described in the present invention, the present invention also includes the computer itself.

[0104] A computer program can be applied to input data to perform the functions described herein, thereby transforming the input data to generate output data stored in a non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the present invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on a display.

[0105] In the foregoing description of the present specification, descriptions with reference to the terms "one embodiment", "another embodiment", or "certain embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0107] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A control system for multiple LED lamp beads, characterized in that: include: A DC / DC converter, wherein the DC / DC converter is used to output a constant current; A micro control unit, wherein the micro control unit is used to output a control signal; One or more PCB substrates, wherein a plurality of LED modules are arranged on the PCB substrates, each of the LED modules is provided with at least two groups of LED units, each group of the LED units comprises a plurality of LED lamp beads, and the LED lamp beads between the LED units of each group and within the LED units of each group are connected in series and parallel to form a grid circuit; A switch unit, the DC / DC converter, the micro control unit and each of the LED modules are connected to the switch unit, and the switch unit is used to control the brightness of the lamp beads on the PCB substrate according to the control signal.

2. A multiple LED lamp bead control system according to claim 1, characterized in that: The switch unit includes a plurality of FET channels, the number of the FET channels is equal to the number of the LED modules, and each of the FET channels is connected to the LED modules in a one-to-one correspondence.

3. A multiple LED lamp bead control system according to claim 2, characterized in that: The FET channels are all field effect transistors, the gate of each field effect transistor is connected to one end of all the LED units of the corresponding LED module, and the drain of each field effect transistor is connected to the other end of all the LED units of the corresponding LED module.

4. A multiple LED lamp bead control system according to claim 1, characterized in that: There are at least two PCB substrates, and each of the PCB substrates further includes a BIN resistor, one end of the BIN resistor is connected to the micro control unit, and the other end of the BIN resistor is grounded.

5. A control system for multiple LED lamp beads according to claim 4, characterized in that: The BIN levels of the brightness of the lamp beads of at least two of the PCB substrates are different, and the resistance value of the BIN resistor on each of the PCB substrates corresponds to the BIN level of the brightness of the lamp beads of the PCB substrate.

6. A control method for a plurality of LED lamp bead control systems, used for controlling by a plurality of LED lamp bead control systems as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Output constant current through DC / DC converter; Outputting control signals via a microcontroller unit; The brightness of the lamp beads on the PCB substrate is controlled by the switch unit according to the control signal; Among them, the PCB substrate is one or more pieces, and a plurality of LED modules are arranged on the PCB substrate. Each of the LED modules is provided with at least two groups of LED units, and each group of the LED units includes a plurality of LED lamp beads. The LED lamp beads between each group of LED units and within each group of LED units are connected in series and parallel to form a grid circuit.

7. The control method of a multi-LED lamp bead control system according to claim 6, characterized in that: The PCB substrates are at least two pieces, and the switch unit controls the brightness of the lamp beads on the PCB substrates according to the control signal, specifically including: When the BIN levels of the lamp bead brightness of at least two of the PCB substrates are different, the microcontroller unit obtains the resistance value corresponding to the BIN resistor on the PCB substrate, and obtains the BIN level of the lamp bead brightness of the PCB substrate according to the resistance value, and then outputs the control signal according to the BIN level of the lamp bead brightness; The switch unit adjusts the duty cycle of the FET channel corresponding to the PCB substrate according to the control signal, so that the brightness of the lamp beads on each PCB substrate is consistent.

8. The control method of a multi-LED lamp bead control system according to claim 6, characterized in that: The PCB substrate is at least one, and the switch unit controls the brightness of the lamp beads on the PCB substrate according to the control signal, specifically including: When the luminous intensities of at least two of the LED modules are different, the micro control unit outputs the control signal according to the luminous intensities; The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that the brightness of the lamp beads of each LED module can be adjusted arbitrarily.

9. The control method of a multi-LED lamp bead control system according to claim 6, characterized in that: The PCB substrate is at least one, and the switch unit controls the brightness of the lamp beads on the PCB substrate according to the control signal, specifically including: When the lamp beads of at least two of the LED modules have different colors, the micro control unit outputs the control signal according to the colors of the lamp beads; The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that the brightness of the lamp beads of each LED module can be adjusted arbitrarily.

10. The control method of a multi-LED lamp bead control system according to claim 6, characterized in that: The PCB substrate is at least one, and the switch unit controls the brightness of the lamp beads on the PCB substrate according to the control signal, specifically including: When the numbers of lamp beads of at least two of the LED modules are different, the microcontroller unit outputs the control signal according to the numbers of the lamp beads; The switch unit adjusts the duty cycle corresponding to the LED module according to the control signal, so that the brightness of the lamp beads of each LED module can be adjusted arbitrarily.

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