AC / DC power supply method and system for parallel LED array

Abstract

This application provides an AC / DC power supply method and system suitable for parallel LED arrays, belonging to the field of power electronics technology. The method involves: detecting the AC power supply connection status and determining the target power supply branch accordingly; acquiring the configuration parameters of the parallel LED array and setting the power supply parameters of the controllable power module corresponding to the target power supply branch to supply power to the parallel LED array according to these parameters; detecting the output voltage and current of the parallel LED array to determine its actual power characteristics; determining whether there are any abnormalities in the parallel LED array based on the actual power characteristics and configuration parameters; if so, shutting down the controllable power module to stop power supply; if not, adjusting the power supply parameters according to the actual power characteristics and configuration parameters. This application can adaptively adapt to different parallel LED arrays and achieve constant voltage and constant current output, while also possessing multi-dimensional feature recognition capabilities, thereby improving the versatility and safety of the power supply.

Description

Technical Field

[0001] This application relates to the field of electronic power technology, and more specifically, to an AC / DC power supply method and system suitable for parallel LED arrays. Background Technology

[0002] Light-emitting diodes (LEDs), as a typical semiconductor nonlinear load, exhibit strong threshold voltage characteristics and a steep forward conduction, significantly different from the linear ohmic relationship of resistive loads and the transient energy storage response characteristics of inductive loads. Specifically, when the forward voltage does not reach the critical turn-on voltage, the load current is almost zero; however, after the forward voltage reaches the critical turn-on voltage, the load current increases exponentially with the voltage. Therefore, a dynamically adjustable drive power supply is urgently needed for precise power supply to prevent equipment burnout due to overcurrent.

[0003] In related technologies, high-power power supply systems for parallel LED arrays often adopt a constant current-constant voltage dual-mode switching drive architecture: initially, the operating voltage is established in constant voltage mode, and after the LED branch is turned on, it automatically switches to constant current mode to maintain the rated current output.

[0004] However, when powering parallel LED arrays based on related technologies, although it can maintain the normal operation of the remaining branches when a single LED is open or short-circuited, thus improving the lifespan of the LEDs and the stability of the system, its underlying control logic is fixed. The voltage / current sampling threshold, protection delay, and state switching conditions are all preset by hardware comparators or fixed firmware, lacking adaptability and multi-dimensional feature discrimination capabilities. Summary of the Invention

[0005] The purpose of this application is to provide an AC / DC power supply method and system suitable for parallel LED arrays, which can adaptively adapt to different parallel LED arrays and achieve constant voltage and constant current output, while also having multi-dimensional feature recognition capabilities, so as to improve the versatility and safety of power supply.

[0006] The embodiments of this application are implemented as follows: A first aspect of this application provides an AC / DC power supply method suitable for parallel LED arrays, the method comprising: The AC power supply connection status is detected, and the target power supply branch is determined based on the connection status. The connection status is used to indicate whether the AC / DC power supply system is currently connected to AC power. Obtain the configuration parameters of the parallel LED array, and set the power supply parameters of the target controllable power module corresponding to the target power supply branch according to the configuration parameters, so that the target controllable power module supplies power to the parallel LED array according to the set power supply parameters; Detect the output voltage and output current of the parallel LED array to determine the actual power characteristics of the parallel LED array; Based on the actual power characteristics and configuration parameters, determine whether there are any anomalies in the parallel LED array; If so, then shut down the target controllable power module to stop supplying power to the parallel LED array; If not, adjust the power supply parameters of the target controllable power module according to the actual power characteristics and configuration parameters so that the target controllable power module supplies power to the parallel LED array according to the adjusted power supply parameters.

[0007] As one possible implementation, the configuration parameters include: rated current, rated voltage, and voltage ramp-up parameters; the power supply parameters include: current and voltage; and the power supply parameters of the target controllable power module corresponding to the target power supply branch are adjusted according to the configuration parameters, including: Set the current of the target controllable power supply module according to the rated current; The voltage of the target controllable power supply module is set according to the first ratio of the rated voltage to the voltage ramp-up parameter.

[0008] As one possible implementation, the actual power characteristics include: the maximum current variation and the current gradient variation; the configuration parameters include: the upper limit of current variation and the upper limit of current gradient variation; based on the actual power characteristics and configuration parameters, determine whether there are any anomalies in the parallel LED array, including: If the maximum value of the current change is greater than the upper limit of the current change, or the value of the current gradient change is greater than the upper limit of the current gradient, then it is determined that there is an anomaly in the parallel LED array.

[0009] As one possible implementation, the actual power characteristics include: average current and average voltage. Based on the actual power characteristics and configuration parameters, the power supply parameters of the target controllable power module are adjusted, including: Based on the average current and configuration parameters, determine whether there is an abnormal current in the parallel LED array; If so, reduce the voltage of the target controllable power module according to the configuration parameters; If not, determine whether there is a voltage anomaly in the parallel LED array based on the average voltage and configuration parameters; If so, increase the voltage of the target controllable power module according to the configuration parameters.

[0010] As one possible implementation, the above configuration parameters include: rated current and current tolerance. Based on the average current and configuration parameters, it is determined whether there is a current anomaly in the parallel LED array, including: If the average current is greater than the first sum between the rated current and the current tolerance, then it is determined that there is a current anomaly in the parallel LED array.

[0011] As one possible implementation, the configuration parameters include: rated voltage, voltage ramp-up parameters, and voltage ramp-up coefficient. Based on these configuration parameters, the voltage of the target controllable power supply module is reduced, including: Calculate the second sum between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate the second ratio between the rated voltage and the second sum, and reduce the voltage of the target controllable power module according to the second ratio.

[0012] As one possible implementation, the configuration parameters include: rated voltage; and based on the average voltage and configuration parameters, determining whether there are voltage anomalies in the parallel LED array, including: If the average voltage is greater than or equal to the rated voltage, it is determined that there is no voltage abnormality in the parallel LED array; otherwise, it is determined that there is a voltage abnormality in the parallel LED array.

[0013] As one possible implementation, the configuration parameters include: rated voltage, voltage ramp-up parameters, and voltage ramp-up coefficient. Based on these configuration parameters, the voltage of the target controllable power supply module is increased, including: Calculate the second difference between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate the third ratio between the rated voltage and the second difference, and increase the voltage of the target controllable power supply module according to the third ratio.

[0014] As one possible implementation, the target power supply branch is determined based on the access status, including: If the access status indicates that the AC / DC power supply system is currently connected to an AC power source, then the target power supply branch is determined to be an AC power supply branch; If the access status indicates that the AC / DC power supply system is not currently connected to an AC power source, then the target power supply branch is determined to be a DC-DC power supply system.

[0015] A second aspect of this application provides an AC / DC power supply system, which includes: a control module, an AC-DC controllable power supply module, a DC-DC controllable power supply module, a current sampling module, a voltage sampling module, and a charging module. The AC-DC controllable power supply module includes an AC interface. The AC interface of the AC-DC controllable power supply module is connected to the first sampling terminal of the voltage sampling module and the input terminal of the charging module, respectively. The output terminal of the charging module is connected to the input terminal of the DC-DC controllable power supply module. The control terminal of the AC-DC controllable power supply module is connected to the first output terminal of the control module. The control terminal of the DC-DC controllable power supply module is connected to the second output terminal of the control module. Both the output terminals of the AC-DC controllable power supply module and the DC-DC controllable power supply module are connected to the power supply terminal of the external parallel LED array. The second sampling terminal of the voltage sampling module is connected to the output terminal of the DC-DC controllable power supply module, the third sampling terminal of the voltage sampling module is connected to the output terminal of the AC-DC controllable power supply module, the fourth sampling terminal of the voltage sampling module is connected to the output terminal of the external parallel LED array, and the output terminal of the voltage sampling module is connected to the first input terminal of the control module. The first sampling terminal of the current sampling module is connected to the output terminal of the AC-DC controllable power supply module, the second sampling terminal of the current sampling module is connected to the output terminal of the DC-DC controllable power supply module, the third sampling terminal of the current sampling module is connected to the output terminal of the external parallel LED array, and the output terminal of the current sampling module is connected to the second input terminal of the control module. The control module is used to execute the steps of the AC / DC power supply method described in the first aspect above.

[0016] The beneficial effects of the embodiments of this application include: This application provides an AC / DC power supply method for parallel LED arrays. The method involves detecting the AC power connection status of the AC interface of an AC-DC controllable power supply module to select a target power supply branch; acquiring the configuration parameters of the parallel LED array and setting the initial power supply parameters of the target controllable power supply module corresponding to the target power supply branch, so that the target controllable power supply module supplies power to the parallel LED array according to the set initial power supply parameters; detecting the output voltage and output current of the parallel LED array to determine its actual power characteristics; and judging whether there is an anomaly in the parallel LED array based on its actual power characteristics and configuration parameters. If so, the target controllable power supply module is directly shut down to cut off its output power and stop supplying power to the parallel LED array; if not, the power supply parameters of the target controllable power supply module are adjusted according to the actual power characteristics and configuration parameters of the parallel LED array so that its current power supply performance meets the power supply requirements of the parallel LED array. This achieves adaptive adaptation to different parallel LED arrays and constant voltage / constant current output, while also possessing multi-dimensional feature recognition capabilities, thus improving the versatility and safety of the power supply. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an AC / DC power supply system provided in an embodiment of this application; Figure 2 A flowchart illustrating the first AC / DC power supply method provided in the embodiments of this application; Figure 3 A flowchart illustrating the second AC / DC power supply method provided in the embodiments of this application; Figure 4 A flowchart illustrating the third AC / DC power supply method provided in the embodiments of this application; Figure 5 A flowchart illustrating the fourth AC / DC power supply method provided in the embodiments of this application.

[0019] Reference numerals: 10: AC / DC power supply system; 101: Control module; 102: AC-DC controllable power supply module; 103: DC-DC controllable power supply module; 104: Current sampling module; 105: Voltage sampling module; 106: Charging module. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Currently, constant current and constant voltage power supply methods are often used to power parallel LED arrays. Although this can solve the problem of some LEDs still working normally after they are damaged, these power supply devices have fixed circuit structures and their detection is based on fixed thresholds and control logic. Therefore, the functions they can achieve are limited, and it is difficult to solve the power supply problem in extreme scenarios.

[0025] Therefore, this application provides an AC / DC power supply method suitable for parallel LED arrays. The method involves detecting the AC power supply connection status to select a target power supply branch; acquiring the configuration parameters of the external parallel LED array and setting the power supply parameters of the target controllable power module corresponding to the target power supply branch according to the configuration parameters, so that the target controllable power module supplies power to the parallel LED array according to the set power supply parameters; detecting the output voltage and output current of the parallel LED array to determine its actual power characteristics; determining whether there is an anomaly in the parallel LED array based on the actual power characteristics and configuration parameters; if so, shutting down the target controllable power module to stop supplying power to the parallel LED array; if not, adjusting the power supply parameters of the target controllable power module according to the actual power characteristics and configuration parameters, so that the target controllable power module continues to supply power to the parallel LED array according to the adjusted power supply parameters. This achieves adaptive adaptation to different parallel LED arrays and constant voltage / constant current output, while also possessing multi-dimensional feature recognition capabilities, thereby improving the versatility and safety of the power supply.

[0026] The AC / DC power supply method and system for parallel LED arrays provided in this application will be explained in detail below with reference to the accompanying drawings.

[0027] Figure 1 A schematic diagram of an AC / DC power supply system for a parallel LED array provided in this application is shown below. Figure 1 This application provides an AC / DC power supply system 10, which includes: a control module 101, an AC-DC controllable power supply module 102, a DC-DC controllable power supply module 103, a current sampling module 104, a voltage sampling module 105, and a charging module 106. The AC-DC controllable power supply module 102 includes an AC interface.

[0028] The AC interface of the AC-DC controllable power supply module 102 is connected to the first sampling terminal of the voltage sampling module 105 and the input terminal of the charging module 106, respectively. The output terminal of the charging module 106 is connected to the input terminal of the DC-DC controllable power supply module 103. The control terminal of the AC-DC controllable power supply module 102 is connected to the first output terminal of the control module 101. The control terminal of the DC-DC controllable power supply module 103 is connected to the second output terminal of the control module 101. The output terminals of both the AC-DC controllable power supply module 102 and the DC-DC controllable power supply module 103 are connected to the power supply terminal of the external parallel LED array. The second sampling terminal of the voltage sampling module 105 is connected to the output terminal of the DC-DC controllable power supply module 103, the third sampling terminal of the voltage sampling module 105 is connected to the output terminal of the AC-DC controllable power supply module 102, the fourth sampling terminal of the voltage sampling module 105 is connected to the output terminal of the external parallel LED array, and the output terminal of the voltage sampling module 105 is connected to the first input terminal of the control module 101. The first sampling terminal of the current sampling module 104 is connected to the output terminal of the AC-DC controllable power supply module 102, the second sampling terminal of the current sampling module 104 is connected to the output terminal of the DC-DC controllable power supply module 103, the third sampling terminal of the current sampling module 104 is connected to the output terminal of the external parallel LED array, and the output terminal of the current sampling module 104 is connected to the second input terminal of the control module 101. The control module 101 is used to perform the steps of the AC / DC power supply method applicable to parallel LED arrays described below.

[0029] The control module 101, as the core logic control unit of the AC / DC power supply system 10, is used to execute the AC / DC power supply method. Specifically, the control module 101 determines the AC power supply connection status and the operating status of the external parallel LED array based on the voltage signals sampled by the voltage sampling module 105 and the current signals sampled by the current sampling module 104. It then controls the enable and output parameters of the AC-DC controllable power supply module 102 and the DC-DC controllable power supply module 103 accordingly, while simultaneously detecting and protecting against abnormalities such as micro-short circuits and contact discharges.

[0030] Optionally, the AC interface of the AC-DC controllable power supply module 102 is used to connect to an external AC power source. It integrates an adjustable AC-DC conversion circuit, which can convert AC power into adjustable DC power under the control of the control module 101 to power the parallel LED array.

[0031] Optionally, the DC-DC controllable power module 103 integrates an adjustable DC-DC conversion circuit and an energy storage battery. The input terminal of the DC-DC controllable power module 103 is connected to the AC interface of the AC-DC controllable power module 102 via the charging module 106 to obtain charging power from the AC interface and charge the energy storage battery inside the DC-DC controllable power module 103. The DC power output from the energy storage battery is converted into adjustable DC power through the built-in DC-DC conversion circuit, which serves as a backup power supply branch to power the parallel LED array.

[0032] Optionally, the voltage sampling module 105 has multiple sampling terminals. The first sampling terminal of the voltage sampling module 105 is connected to the AC interface of the AC-DC controllable power supply module 102 for detecting whether the AC power supply is connected. The second sampling terminal of the voltage sampling module 105 is connected to the output terminal of the DC-DC controllable power supply module 103 for detecting the output voltage of the DC-DC controllable power supply module 103. The third sampling terminal of the voltage sampling module 105 is connected to the output terminal of the AC-DC controllable power supply module 102 for detecting the output voltage of the AC-DC controllable power supply module 102. The fourth sampling terminal of the voltage sampling module 105 is connected to the output terminal of the parallel LED array for detecting the output voltage of the parallel LED array.

[0033] Furthermore, the voltage sampling module 105 divides and conditions the voltage signals collected from each channel and then sends them to the first input terminal of the control module 101, providing a basis for power supply branch selection, power supply parameter adjustment of the controllable power supply module, and overvoltage judgment.

[0034] Optionally, the current sampling module 104 has multiple sampling terminals. The first sampling terminal of the current sampling module 104 is connected to the output terminal of the AC-DC controllable power supply module 102 and is used to detect the output current of the AC-DC controllable power supply module 102. The second sampling terminal of the current sampling module 104 is connected to the output terminal of the DC-DC controllable power supply module 103 and is used to detect the output current of the DC-DC controllable power supply module 103. The third sampling terminal of the current sampling module 104 is connected to the output terminal of the parallel LED array and is used to detect the output current of the parallel LED array.

[0035] Furthermore, the current sampling module 104 uses core electronic devices such as sampling resistors and current sampling amplifiers to convert the current signals of each channel into voltage quantities and then sends them to the second input terminal of the control module 101 to calculate the average current value, the maximum current change value, and the current gradient, thereby realizing constant current control, abnormal detection, and overcurrent protection.

[0036] Optionally, the input terminal of the charging module 106 is connected to the AC interface of the AC-DC controllable power supply module 102, and the output terminal of the charging module 106 is connected to the input terminal of the DC-DC controllable power supply module 103. When the AC power supply is normally connected, the charging module 106 uses the AC power provided by the AC power supply to charge the energy storage battery in the DC-DC controllable power supply module 103 to ensure the energy reserve of the DC power supply branch.

[0037] Optionally, when the AC / DC power supply system 10 is working, the specific workflow of the AC / DC power supply system 10 is as follows: S1. The control module 101 detects whether there is voltage at the AC interface of the AC-DC controllable power supply module 102 through the first sampling terminal of the voltage sampling module 105; S2.1. If it is detected that the AC interface of the AC-DC controllable power supply module 102 is connected to an external AC power source, the control module 101 first enables the AC-DC controllable power supply module 102, and then shuts down the output path of the DC-DC controllable power supply module 103 after its output stabilizes, so that the AC power supply branch provides power; S2.2. If it is detected that the AC interface of the AC-DC controllable power supply module 102 is not connected to an external AC power source, the DC-DC controllable power supply module 103 is first enabled, and then the AC-DC controllable power supply module 102 is shut down, switching to the DC power supply branch; S3. After the power supply branch is selected, the control module 101 reads its configuration parameters from the external parallel LED array and controls the currently enabled controllable power supply module to set the output current limit to I. The output voltage is initially set to V / n to achieve soft start; S4. During normal operation, the voltage sampling module 105 and the current sampling module 104 continuously collect the output voltage and output current of the parallel LED array, and feed back the output voltage and output current of the parallel LED array to the control module 101 in real time; S5. The control module 101 determines the actual power characteristics of the parallel LED array based on the output voltage and output current of the parallel LED array; S6. The control module 101 determines whether there is an abnormality in the parallel LED array based on the actual power characteristics and configuration parameters of the parallel LED array; S7.1. If yes, the control module 101 shuts down the output of the current controllable power supply module and sends an alarm signal through the alarm interface; S7.2. If no, the control module 101 further adjusts the power supply parameters of the current controllable power supply module based on the actual power characteristics and configuration parameters of the parallel LED array, so that the current controllable power supply module continues to supply power to the parallel LED array according to the adjusted power supply parameters, thereby realizing constant voltage and constant current adaptive control.

[0038] Figure 2 This application provides a flowchart of an AC / DC power supply method for parallel LED arrays, which can be applied to... Figure 1 10. AC / DC power supply system. See also Figure 2 This application provides an AC / DC power supply method, including: S201. Detect the AC power supply connection status and determine the target power supply branch based on the connection status. The connection status is used to indicate whether the AC / DC power supply system is currently connected to AC power.

[0039] Optionally, the control module detects whether a valid AC input voltage exists at the AC interface of the AC-DC controllable power supply module via a voltage sampling module to determine the AC power supply connection status. Specifically, if a valid AC input voltage is detected at the AC interface of the AC-DC controllable power supply module, it is determined that the AC interface of the AC-DC controllable power supply module is connected to an external AC power supply; conversely, if no valid AC input voltage is detected at the AC interface of the AC-DC controllable power supply module, it is determined that the AC interface of the AC-DC controllable power supply module is not connected to an external AC power supply.

[0040] Optionally, the control module determines the AC power supply connection status of the AC-DC controllable power supply module based on the real-time voltage signal of the AC interface, and selects the target power supply branch according to the AC power supply connection status. Specifically, if it is determined that the AC interface of the AC-DC controllable power supply module is currently connected to AC power, then the target power supply branch is determined to be the AC power supply branch, that is, the AC-DC controllable power supply module is used to power the parallel LED array; if it is determined that the AC interface of the AC-DC controllable power supply module is not currently connected to AC power, then the target power supply branch is determined to be the DC power supply branch, that is, the DC-DC controllable power supply module is used to power the parallel LED array.

[0041] It is worth noting that, in order to ensure uninterrupted power supply to the parallel LED array, a "first-on, then-off" strategy is adopted when switching power supply branches: if it is necessary to switch to the AC power supply branch, the AC-DC controllable power module is enabled first, and after its output stabilizes, the DC-DC controllable power module is turned off; the reverse is also true.

[0042] S202. Obtain the configuration parameters of the parallel LED array, and set the power supply parameters of the target controllable power module corresponding to the target power supply branch according to the configuration parameters, so that the target controllable power module supplies power to the parallel LED array according to the set power supply parameters.

[0043] Optionally, the control module reads the pre-written configuration parameters of the parallel LED array from its internal memory, or reads the configuration parameters of the parallel LED array in real time from the parallel LED array via an external communication interface. The configuration parameters of the parallel LED array include: rated current, rated voltage, voltage ramp-up parameter, upper limit of current variation, upper limit of current gradient variation, voltage ramp-up coefficient, and current tolerance.

[0044] Specifically, rated current refers to the nominal current value required for the parallel LED array to operate normally; rated voltage refers to the nominal voltage value required for the parallel LED array to operate normally; voltage ramp-up parameter refers to the control parameter for soft start of the parallel LED array; upper limit of current variation refers to the maximum instantaneous change of load current allowed by the parallel LED array; upper limit of current gradient variation refers to the maximum allowable rate of change of load current by the parallel LED array; voltage ramp-up coefficient is the adjustment step size or rate used to control the voltage ramp-up parameter; and current tolerance refers to the allowable fluctuation range of the rated current of the parallel LED array.

[0045] Optionally, the control module, based on the read configuration parameters of the parallel LED array, sends a setting command to the target controllable power module corresponding to the currently selected target power supply branch via the communication bus. This causes the target controllable power module to output power according to the power supply parameters indicated by the setting command, thereby achieving soft start of the parallel LED array and preventing damage to the parallel LED array due to voltage surges. The target controllable power module can be either an AC-DC controllable power module or a DC-DC controllable power module, specifically determined by the selected power supply branch of the AC / DC power supply system.

[0046] It should be noted that the setting instructions include: current setting value and voltage setting value. Based on the current setting value, the output current of the target controllable power module corresponding to the target power supply branch can be set, and based on the voltage setting value, the output voltage of the target controllable power module corresponding to the target power supply branch can be set.

[0047] S203. Detect the output voltage and output current of the parallel LED array to determine the actual power characteristics of the parallel LED array.

[0048] Optionally, the control module acquires the output voltage of the parallel LED array in real time through a voltage sampling module and the output current of the parallel LED array in real time through a current sampling module. It then performs digital filtering and characteristic value calculation on the output voltage and current of the parallel LED array to obtain the actual power characteristics of the parallel LED array. These actual power characteristics include: average voltage, average current, maximum current variation, and current substitute variation.

[0049] Specifically, the maximum current change represents the maximum change in the output current of the parallel LED array within a preset time window; the current gradient change represents the derivative of the output current of the parallel LED array with respect to time, that is, the rate of change of the output current of the parallel LED array per unit time.

[0050] S204. Based on the actual power characteristics and configuration parameters, determine whether there are any abnormalities in the parallel LED array.

[0051] Optionally, the control module compares the actual power characteristics of the parallel LED array with the configuration parameters of the parallel LED array to determine whether there is an anomaly in the parallel LED array.

[0052] S205. If so, then shut down the target controllable power module and stop supplying power to the parallel LED array.

[0053] Optionally, if there is an abnormality in the parallel LED array, the control module immediately sends a shutdown command to the currently enabled target controllable power module to cut off the output power of the target controllable power module and trigger an alarm signal at the same time.

[0054] Furthermore, the AC / DC power supply system enters a protection state until the fault is cleared and power is restored or a reset command is received to resume operation.

[0055] S206. If not, adjust the power supply parameters of the target controllable power module according to the actual power characteristics and configuration parameters so that the target controllable power module supplies power to the parallel LED array according to the adjusted power supply parameters.

[0056] Optionally, if there are no abnormalities in the parallel LED array, the control module further adjusts the power supply parameters of the target controllable power supply module according to the actual power characteristics and configuration parameters of the parallel LED array, and performs constant voltage and constant current adaptive adjustment.

[0057] Optionally, after each adjustment, the control module writes the new voltage and current settings to the target controllable power supply module via communication commands, so that the target controllable power supply module outputs according to the adjusted power supply parameters.

[0058] It can be seen that this dynamic adaptive power supply for the parallel LED array ensures that it operates in a constant voltage and constant current state under various working conditions, while also being able to respond to anomalies in a timely manner and protect the load.

[0059] In this embodiment, the target power supply branch is selected by detecting the AC power connection status of the AC interface of the AC-DC controllable power supply module; the configuration parameters of the parallel LED array are obtained, and the initial power supply parameters of the target controllable power supply module corresponding to the target power supply branch are set accordingly, so that the target controllable power supply module supplies power to the parallel LED array according to the set initial power supply parameters; the output voltage and output current of the parallel LED array are detected to determine the actual power characteristics of the parallel LED array, and based on the actual power characteristics and configuration parameters of the parallel LED array, it is determined whether there is an abnormality in the parallel LED array; if so, the target controllable power supply module is directly shut down to cut off the output power of the target controllable power supply module and stop supplying power to the parallel LED array; if not, the power supply parameters of the target controllable power supply module are adjusted according to the actual power characteristics and configuration parameters of the parallel LED array so that the current power supply performance of the target controllable power supply module meets the power supply requirements of the parallel LED array. In this way, it is possible to adaptively adapt to different parallel LED arrays and achieve constant voltage and constant current output, while also having multi-dimensional feature recognition capabilities, so as to improve the versatility and safety of power supply.

[0060] An alternative implementation method is described in [reference]. Figure 3 The configuration parameters include: rated current, rated voltage, and voltage ramp-up parameters. The power supply parameters include: current and voltage. The operation of "adjusting the power supply parameters of the target controllable power module corresponding to the target power supply branch according to the configuration parameters" in step S202 above can be specifically as follows: S301. Set the current of the target controllable power supply module according to the rated current.

[0061] Optionally, the control module sets the output current of the target controllable power supply module corresponding to the currently selected target power supply branch according to the rated current in the configuration parameters of the parallel LED array. This output current is the rated current, so as to ensure that the target controllable power supply module will not output current exceeding its carrying capacity to the parallel LED array under normal working conditions.

[0062] S302. Set the voltage of the target controllable power supply module according to the first ratio of the rated voltage to the voltage ramp-up parameter.

[0063] Optionally, a first ratio between the rated voltage of the parallel LED array and the voltage ramp-up parameter is calculated, and the output voltage of the target controllable power module is set based on the first ratio.

[0064] Specifically, based on the first ratio, the control module sends a voltage setting command to the target controllable power module through the communication interface, setting its output voltage to the first ratio.

[0065] In one optional implementation, the actual power characteristics include: the maximum value of current change and the value of current gradient change; the configuration parameters include: the upper limit value of current change and the upper limit value of current gradient change; and the operation of step S204 above can specifically be as follows: If the maximum value of the current change is greater than the upper limit of the current change, or the value of the current gradient change is greater than the upper limit of the current gradient, then it is determined that there is an anomaly in the parallel LED array.

[0066] Optionally, the control module compares the maximum current variation value in the actual power characteristics of the parallel LED array with the upper limit value of the current variation value in the configuration parameters of the parallel LED array, or compares the current gradient variation value in the actual power characteristics of the parallel LED array with the upper limit value of the current gradient variation value in the configuration parameters of the parallel LED array, to determine whether there is an anomaly in the parallel LED array.

[0067] Specifically, if the maximum value of the current change in the parallel LED array is greater than the upper limit of the current change, or if the value of the current gradient change in the parallel LED array is greater than the upper limit of the current gradient change, then it is determined that there is an anomaly in the parallel LED array.

[0068] Among them, the maximum current change reflects the maximum amplitude of the instantaneous fluctuation of the current of the parallel LED array within a preset time window. When faults such as contact discharge, poor contact, or cold solder joint occur, the current of the parallel LED array will experience a violent transient jump, causing the maximum current change to exceed the normal range. The current gradient change reflects the rate of change of the current of the parallel LED array over time. When a micro short circuit fault occurs, such as when the insulation deteriorates due to moisture or immersion but does not reach the short circuit protection threshold, the current rise rate of the parallel LED array will increase significantly, causing the current gradient change to exceed the normal range.

[0069] Furthermore, if an anomaly is detected in the parallel LED array, the control module will immediately send a shutdown command to the target controllable power module to shut it down, and at the same time issue an alarm signal, which can effectively prevent accidents such as fires and tube explosions caused by micro short circuits or contact discharges.

[0070] In one alternative implementation, see [link to implementation details]. Figure 4 The actual power characteristics include: average current and average voltage. The operation in step S206 above, "adjusting the power supply parameters of the target controllable power module according to the actual power characteristics and configuration parameters," can specifically be: S401. Based on the average current and configuration parameters, determine whether there is an abnormal current in the parallel LED array.

[0071] Optionally, the control module compares the average current in the actual power characteristics of the parallel LED array with the rated current in the configuration parameters of the parallel LED array to determine whether there is a current anomaly in the parallel LED array.

[0072] Specifically, if the average current of the parallel LED array is greater than the sum of the rated current and the current tolerance, then the parallel LED array is determined to have an abnormally high current. If the average current of the parallel LED array is less than or equal to the sum of the rated current and the current tolerance, and the average current of the parallel LED array is greater than or equal to the difference between the rated current and the current tolerance, then the current of the parallel LED array is determined to be normal. If the average current of the parallel LED array is lower than the difference between the rated current and the current tolerance, then the voltage judgment process is initiated. It is worth noting that abnormal current specifically refers to a situation where the current exceeds the rated upper limit due to excessively high output voltage or sudden changes in load impedance.

[0073] S402. If so, reduce the voltage of the target controllable power module according to the configuration parameters.

[0074] Optionally, if an abnormal current is detected in the parallel LED array, the control module reduces the voltage of the target controllable power supply module by increasing the voltage ramp-up parameter. Specifically, the control module increases the voltage ramp-up parameter and updates the output voltage of the target controllable power supply module to the ratio of the rated voltage to the new voltage ramp-up parameter. In this way, by reducing the output voltage of the target controllable power supply module, the current of the parallel LED array is brought back to the rated range, preventing damage to the parallel LED array due to overcurrent.

[0075] S403. If not, determine whether there is a voltage anomaly in the parallel LED array based on the average voltage and configuration parameters.

[0076] Optionally, if it is determined that there is no current abnormality in the parallel LED array, then the voltage abnormality in the parallel LED array can be further determined based on the average voltage value and configuration parameters in the actual power characteristics of the parallel LED array.

[0077] S404. If so, increase the voltage of the target controllable power module according to the configuration parameters.

[0078] Optionally, if a voltage anomaly is determined in the parallel LED array, the voltage ramp-up parameter is reduced according to the configuration parameters of the parallel LED array to increase the output voltage of the target controllable power supply module. Specifically, the control module reduces the voltage ramp-up parameter and updates the output voltage of the target controllable power supply module to the ratio of the rated voltage to the new voltage ramp-up parameter.

[0079] In an optional implementation, the configuration parameters include: rated current and current tolerance, and the operation of step S401 can specifically be as follows: If the average current is greater than the first sum between the rated current and the current tolerance, then it is determined that there is a current anomaly in the parallel LED array.

[0080] Optionally, the control module calculates the first sum between the rated current and the current tolerance in the configuration parameters of the parallel LED array based on the configuration parameters of the parallel LED array, and compares the average current in the actual power characteristics of the parallel LED array with the first sum to determine whether there is a current anomaly in the parallel LED array.

[0081] Specifically, if the average current in the actual power characteristics of the parallel LED array is greater than the first sum value, then a current anomaly is determined to exist in the parallel LED array. This current anomaly typically indicates that the output voltage of the parallel LED array is too high or the load impedance has abnormally decreased, causing the actual current flowing through the parallel LED array to exceed the maximum current safety limit defined by the first sum value.

[0082] Furthermore, if there is an abnormal current in the parallel LED array, the control module increases the voltage ramp-up parameter according to the configuration parameters of the parallel LED array to reduce the output voltage of the target controllable power supply module, so that the current of the parallel LED array falls back to the safe range, thereby protecting the parallel LED array from overcurrent damage.

[0083] Optionally, if the average current in the actual power characteristics of the parallel LED array is less than or equal to the first sum, then it is determined that the current of the refrigerator LED array is normal, and then it is further determined whether the voltage state of the parallel LED array is normal.

[0084] In one optional implementation, the configuration parameters include: rated voltage, voltage ramp-up parameter, and voltage ramp-up coefficient. The specific operation of step S402 can be as follows: Calculate the second sum between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate the second ratio between the rated voltage and the second sum, and reduce the voltage of the target controllable power module according to the second ratio.

[0085] Optionally, the control module sends a voltage setting command to the target controllable power module via a communication interface based on the second ratio, so as to set the output voltage of the target controllable power module to the second ratio.

[0086] In one optional implementation, the configuration parameters include: rated voltage, and the operation of step S403 above can specifically be: If the average voltage is greater than or equal to the rated voltage, it is determined that there is no voltage abnormality in the parallel LED array; otherwise, it is determined that there is a voltage abnormality in the parallel LED array.

[0087] Optionally, if there is no current abnormality in the parallel LED array, then the presence of voltage abnormality in the parallel LED array can be further determined by comparing the average voltage in the actual power characteristics of the parallel LED array with the rated voltage in the configuration parameters of the parallel LED array.

[0088] Specifically, if the average voltage of the parallel LED array is greater than or equal to the rated voltage, it is determined that there is no voltage abnormality in the parallel LED array. This indicates that the output voltage of the target controllable power module meets the rated power supply requirements of the parallel LED array, and no boost adjustment is required. If the average voltage of the parallel LED array is less than the rated voltage, it is determined that there is a voltage undervoltage abnormality in the parallel LED array. This indicates that the output voltage of the target controllable power module is significantly insufficient, causing the parallel LED array to fail to operate near the rated voltage, which may affect luminous efficiency and stability.

[0089] In one optional implementation, the configuration parameters include: rated voltage, voltage ramp-up parameters, and voltage ramp-up coefficient. The specific operation of step S404 can be as follows: Calculate the second difference between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate the third ratio between the rated voltage and the second difference, and increase the voltage of the target controllable power supply module according to the third ratio.

[0090] Optionally, the control module sends a voltage setting command to the target controllable power module via a communication interface based on the third ratio, so as to set the output voltage of the target controllable power module to the third ratio.

[0091] In one alternative implementation, see [link to implementation details]. Figure 5 The operation of "determining the target power supply branch according to the access status" in step S201 above can be specifically as follows: S501. If the access status indicates that the AC / DC power supply system is currently connected to AC power, then the target power supply branch is determined to be the AC power supply branch.

[0092] Optionally, if the control module determines that the AC interface of the AC-DC controllable power supply module has been connected to an AC power source, then the target power supply branch is determined to be the AC power supply branch. The control module enables the AC-DC controllable power supply module to convert the AC power supplied by the AC power source into adjustable DC power, thereby powering the parallel LED array.

[0093] S502. If the access status indicates that the AC / DC power supply system is not currently connected to an AC power source, then the target power supply branch is determined to be a DC-DC power supply system.

[0094] Optionally, if the control module determines that the AC interface of the AC-DC controllable power supply module is not currently connected to an AC power source, then the target power supply branch is determined to be a DC power supply branch. The control module enables the DC-DC controllable power supply module to convert the DC power provided by the energy storage battery into adjustable DC power, thereby powering the parallel LED array.

[0095] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0096] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for supplying AC / DC power to a parallel LED array, characterized in that, The method includes: The AC power supply connection status is detected, and the target power supply branch is determined based on the connection status, wherein the connection status is used to indicate whether the AC / DC power supply system is currently connected to AC power. The configuration parameters of the parallel LED array are obtained, and the power supply parameters of the target controllable power module corresponding to the target power supply branch are set according to the configuration parameters, so that the target controllable power module supplies power to the parallel LED array according to the set power supply parameters. The output voltage and output current of the parallel LED array are detected to determine the actual power characteristics of the parallel LED array. Based on the actual power characteristics and the configuration parameters, determine whether there is any abnormality in the parallel LED array; If so, then shut down the target controllable power module to stop supplying power to the parallel LED array; If not, then based on the actual power characteristics and the configuration parameters, adjust the power supply parameters of the target controllable power module so that the target controllable power module supplies power to the parallel LED array according to the adjusted power supply parameters.

2. The AC / DC power supply method according to claim 1, characterized in that, The configuration parameters include: rated current, rated voltage, and voltage ramp-up parameters. The power supply parameters include: current and voltage. Adjusting the power supply parameters of the target controllable power module corresponding to the target power supply branch according to the configuration parameters includes: Set the current of the target controllable power supply module according to the rated current; The voltage of the target controllable power supply module is set according to the first ratio of the rated voltage to the voltage ramp-up parameter.

3. The AC / DC power supply method according to claim 1, characterized in that, The actual power characteristics include: maximum current variation and current gradient variation; the configuration parameters include: upper limit of current variation and upper limit of current gradient variation; determining whether the parallel LED array has any anomalies based on the actual power characteristics and the configuration parameters includes: If the maximum value of the current change is greater than the upper limit of the current change, or the value of the current gradient change is greater than the upper limit of the current gradient, then it is determined that there is an anomaly in the parallel LED array.

4. The AC / DC power supply method according to claim 1, characterized in that, The actual power characteristics include: average current and average voltage. Adjusting the power supply parameters of the target controllable power module based on the actual power characteristics and the configuration parameters includes: Based on the average current and the configuration parameters, determine whether there is a current anomaly in the parallel LED array; If so, then reduce the voltage of the target controllable power module according to the configuration parameters; If not, then based on the average voltage and the configuration parameters, determine whether there is a voltage anomaly in the parallel LED array; If so, the voltage of the target controllable power module is increased according to the configuration parameters.

5. The AC / DC power supply method according to claim 4, characterized in that, The configuration parameters include: rated current and current tolerance. Determining whether the parallel LED array has current anomalies based on the average current and the configuration parameters includes: If the average current is greater than the first sum between the rated current and the current tolerance, then it is determined that there is a current anomaly in the parallel LED array.

6. The AC / DC power supply method according to claim 4, characterized in that, The configuration parameters include: rated voltage, voltage ramp-up parameters, and voltage ramp-up coefficient. Reducing the voltage of the target controllable power module according to the configuration parameters includes: Calculate the second sum between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate a second ratio between the rated voltage and the second sum, and reduce the voltage of the target controllable power module according to the second ratio.

7. The AC / DC power supply method according to claim 4, characterized in that, The configuration parameters include: rated voltage. Determining whether the parallel LED array has voltage anomalies based on the average voltage and the configuration parameters includes: If the average voltage is greater than or equal to the rated voltage, it is determined that there is no voltage abnormality in the parallel LED array; otherwise, it is determined that there is a voltage abnormality in the parallel LED array.

8. The AC / DC power supply method according to claim 4, characterized in that, The configuration parameters include: rated voltage, voltage ramp-up parameters, and voltage ramp-up coefficient. Increasing the voltage of the target controllable power module according to the configuration parameters includes: Calculate the second difference between the voltage ramp-up parameter and the voltage ramp-up coefficient; Calculate a third ratio between the rated voltage and the second difference, and increase the voltage of the target controllable power module according to the third ratio.

9. The AC / DC power supply method according to claim 1, characterized in that, The step of determining the target power supply branch based on the access status includes: If the access status indicates that the AC / DC power supply system is currently connected to an AC power source, then the target power supply branch is determined to be an AC power supply branch; If the access status indicates that the AC / DC power supply system is not currently connected to an AC power source, then the target power supply branch is determined to be a DC-DC power supply system.

10. An AC / DC power supply system, characterized in that, The AC / DC power supply system includes: a control module, an AC-DC controllable power supply module, a DC-DC controllable power supply module, a current sampling module, a voltage sampling module, and a charging module. The AC-DC controllable power supply module includes an AC interface. The AC interface of the AC-DC controllable power supply module is connected to the first sampling terminal of the voltage sampling module and the input terminal of the charging module, respectively. The output terminal of the charging module is connected to the input terminal of the DC-DC controllable power supply module. The control terminal of the AC-DC controllable power supply module is connected to the first output terminal of the control module. The control terminal of the DC-DC controllable power supply module is connected to the second output terminal of the control module. Both the output terminals of the AC-DC controllable power supply module and the DC-DC controllable power supply module are connected to the power supply terminal of the external parallel LED array. The second sampling terminal of the voltage sampling module is connected to the output terminal of the DC-DC controllable power supply module, the third sampling terminal of the voltage sampling module is connected to the output terminal of the AC-DC controllable power supply module, the fourth sampling terminal of the voltage sampling module is connected to the output terminal of the external parallel LED array, and the output terminal of the voltage sampling module is connected to the first input terminal of the control module. The first sampling terminal of the current sampling module is connected to the output terminal of the AC-DC controllable power supply module, the second sampling terminal of the current sampling module is connected to the output terminal of the DC-DC controllable power supply module, the third sampling terminal of the current sampling module is connected to the output terminal of the external parallel LED array, and the output terminal of the current sampling module is connected to the second input terminal of the control module. The control module is used to execute the steps of the AC / DC power supply method according to any one of claims 1 to 9.

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