Adjacent channel short circuit detection method, apparatus, device, and storage medium

Abstract

This application relates to a method, apparatus, device, and storage medium for detecting short circuits between adjacent channels. The method includes: identifying a first constant current output channel and a second constant current output channel that are adjacent to each other from constant current output channels connected to a driver IC; applying a first driving current to the first constant current output channel and a second driving current to the second constant current output channel, wherein the average value and / or PWM frequency of the first driving current and the second driving current are different; acquiring target detection parameters for the first constant current output channel and / or the second constant current output channel, including feedback voltage or the brightness value of the LED driven by the constant current output channel; and detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet preset short circuit detection conditions. This method can automatically detect whether a short circuit fault exists between two adjacent constant current output channels without requiring manual inspection, significantly improving detection efficiency.

Description

Technical Field

[0001] This application relates to the field of computer technology, and in particular to a method, apparatus, device, and storage medium for detecting short circuits in adjacent channels. Background Technology

[0002] In LED driver integrated circuits (ICs), multiple constant current output channels are typically integrated, each independently driving a string of LEDs. Electrical isolation between channels is crucial to ensure display uniformity and reliability. However, in actual production or use, short circuits can occur between adjacent constant current output channels due to factors such as chip packaging defects, PCB wiring short circuits, solder bridging, or external stress. Once a short circuit occurs between channels, the output terminals of the two constant current sources are directly short-circuited, leading to abnormal current distribution, LED brightness distortion, and even burning out the driver IC.

[0003] Currently, the existing technology for detecting short circuit faults between two constant current output channels mainly relies on manual inspection using a current probe. Specifically, the tester needs to touch the pins or test points of each pair of adjacent channels one by one with the current probe, and determine whether there is a short circuit by observing whether the current reading is abnormal. When the number of channels of the driver IC is large (e.g., 32 channels, 48 ​​channels or even more), the number of adjacent channel pairs increases linearly, resulting in a surge in testing work and low overall testing efficiency. Summary of the Invention

[0004] This application provides a method, apparatus, device, and storage medium for detecting short circuits between adjacent channels, which can automatically detect whether there is a short circuit fault between two adjacent constant current output channels without the need for manual inspection, thus greatly improving detection efficiency.

[0005] In a first aspect, this application provides a method for detecting short circuits in adjacent channels, the method comprising: From the constant current output channels connected to the driver IC, determine the first constant current output channel and the second constant current output channel that are adjacent to each other; A first drive current is applied to the first constant current output channel, and a second drive current is applied to the second constant current output channel, wherein the average value of the first drive current and the second drive current and / or the PWM frequency are different from each other; Obtain target detection parameters from the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include the feedback voltage or the brightness value of the LED driven by the constant current output channel; Based on whether the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel.

[0006] Optionally, when the average value of the first drive current and the second drive current is different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: Collect the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the absolute voltage difference between the first feedback voltage and the second feedback voltage; When the absolute voltage difference is less than or equal to a preset voltage difference threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the absolute voltage difference is greater than a preset voltage difference threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0007] Optionally, when the average value of the first drive current and the second drive current is different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The target feedback voltage of the target constant current output channel is acquired, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the voltage change of the target feedback voltage relative to the preset normal operating voltage; When the voltage change is greater than or equal to a preset voltage change threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the voltage change is less than a preset voltage change threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0008] Optionally, when there are multiple first constant current output channels, and the average values ​​of the first drive current and the second drive current are different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The target feedback voltage corresponding to each target constant current output channel is collected to form a feedback voltage sequence, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Traverse the feedback voltage sequence to detect whether there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds a preset deviation threshold; When there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel corresponding to the abnormal feedback voltage. When there is no abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is no short circuit fault between all first constant current output channels and the corresponding second constant current output channels.

[0009] Optionally, when the average values ​​of the first driving current and the second driving current are different, and the current difference between them exceeds a preset current difference threshold, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The receiving optical acquisition device acquires the first brightness value of the lamp bead driven by the first constant current output channel and the second brightness value of the lamp bead driven by the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the absolute difference in brightness between the first brightness value and the second brightness value; When the absolute difference in brightness is less than a preset brightness threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel; When the absolute difference in brightness is greater than or equal to a preset brightness threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0010] Optionally, when the PWM frequencies of the first drive current and the second drive current are different, and the frequency difference between them exceeds a preset frequency difference threshold, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The receiving optical acquisition device acquires the target brightness value of the lamp bead driven by the target constant current output channel at multiple acquisition time points to obtain a brightness change sequence, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Detect whether there is a beat frequency envelope feature in the brightness change waveform corresponding to the brightness change sequence; When the beat frequency envelope feature is present in the brightness change waveform, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the beat frequency envelope feature is not present in the brightness change waveform, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0011] Optionally, after determining that there is no short-circuit fault between the first constant current output channel and the second constant current output channel, the method further includes: A third driving current is applied to the first constant current output channel and the second constant current output channel so that the lamps driven by the first constant current output channel and the second constant current output channel respectively enter a preset visual indication state.

[0012] Secondly, this application provides an adjacent channel short-circuit detection device, the device comprising: The determining unit is used to determine a first constant current output channel and a second constant current output channel that are adjacent to each other from the constant current output channels connected to the driver IC. The first application unit is used to apply a first driving current to the first constant current output channel and a second driving current to the second constant current output channel, wherein the average value of the first driving current and the second driving current and / or the PWM frequency are different from each other. The acquisition unit is used to acquire target detection parameters of the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include feedback voltage or the brightness value of the lamp bead driven by the constant current output channel; The detection unit is used to detect whether there is a short circuit fault between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions.

[0013] Optionally, when the average value of the first drive current and the second drive current is different, the acquisition unit is configured to: Collect the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel; The detection unit is used for: Determine the absolute voltage difference between the first feedback voltage and the second feedback voltage; When the absolute voltage difference is less than or equal to a preset voltage difference threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the absolute voltage difference is greater than a preset voltage difference threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0014] Optionally, when the average value of the first drive current and the second drive current is different, the acquisition unit is configured to: The target feedback voltage of the target constant current output channel is acquired, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The detection unit is used for: Determine the voltage change of the target feedback voltage relative to the preset normal operating voltage; When the voltage change is greater than or equal to a preset voltage change threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the voltage change is less than a preset voltage change threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0015] Optionally, when there are multiple first constant current output channels, and the average values ​​of the first drive current and the second drive current are different, the acquisition unit is used to: The target feedback voltage corresponding to each target constant current output channel is collected to form a feedback voltage sequence, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The detection unit is used for: Traverse the feedback voltage sequence to detect whether there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds a preset deviation threshold; When there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel corresponding to the abnormal feedback voltage. When there is no abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is no short circuit fault between all first constant current output channels and the corresponding second constant current output channels.

[0016] Optionally, when the average values ​​of the first driving current and the second driving current are different, and the current difference between them exceeds a preset current difference threshold, the acquisition unit is configured to: The receiving optical acquisition device acquires the first brightness value of the lamp bead driven by the first constant current output channel and the second brightness value of the lamp bead driven by the second constant current output channel; The detection unit is used for: Determine the absolute difference in brightness between the first brightness value and the second brightness value; When the absolute difference in brightness is less than a preset brightness threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel; When the absolute difference in brightness is greater than or equal to a preset brightness threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0017] Optionally, when the PWM frequencies of the first drive current and the second drive current are different, and the frequency difference between them exceeds a preset frequency difference threshold, the acquisition unit is used to: The receiving optical acquisition device acquires the target brightness value of the lamp bead driven by the target constant current output channel at multiple acquisition time points to obtain a brightness change sequence, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; The detection unit is used for: Detect whether there is a beat frequency envelope feature in the brightness change waveform corresponding to the brightness change sequence; When the beat frequency envelope feature is present in the brightness change waveform, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the beat frequency envelope feature is not present in the brightness change waveform, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0018] Optionally, after determining that there is no short-circuit fault between the first constant current output channel and the second constant current output channel, the device further includes a second application unit, the second application unit being configured to: A third driving current is applied to the first constant current output channel and the second constant current output channel so that the lamps driven by the first constant current output channel and the second constant current output channel respectively enter a preset visual indication state.

[0019] Thirdly, this application provides an adjacent channel short-circuit detection device, comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to: From the constant current output channels connected to the driver IC, determine the first constant current output channel and the second constant current output channel that are adjacent to each other; A first drive current is applied to the first constant current output channel, and a second drive current is applied to the second constant current output channel, wherein the average value of the first drive current and the second drive current and / or the PWM frequency are different from each other; Obtain target detection parameters from the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include the feedback voltage or the brightness value of the LED driven by the constant current output channel; Based on whether the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel.

[0020] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described adjacent channel short-circuit detection method.

[0021] Compared with the prior art, the technical solution provided in this application has the following advantages: In this application embodiment, a first constant current output channel and a second constant current output channel that are adjacent to each other are determined from the constant current output channels connected to the driver IC; a first driving current is applied to the first constant current output channel, and a second driving current is applied to the second constant current output channel, wherein the average value and / or PWM frequency of the first driving current and the second driving current are different; target detection parameters of the first constant current output channel and / or the second constant current output channel are obtained, wherein the target detection parameters include feedback voltage or the brightness value of the LED driven by the constant current output channel; and a short circuit fault is detected between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions. Therefore, this application can automatically detect whether a short circuit fault exists between two adjacent constant current output channels without requiring manual inspection, greatly improving detection efficiency. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 A flowchart illustrating an adjacent channel short-circuit detection method provided in an embodiment of this application; Figure 2 A schematic diagram of an adjacent channel short-circuit detection method provided in an embodiment of this application; Figure 3 This is a schematic flowchart of an adjacent channel short-circuit detection device provided in an embodiment of this application; Figure 4 This is a schematic diagram of an adjacent channel short-circuit detection device provided in an embodiment of this application. Detailed Implementation

[0026] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0028] In LED driver integrated circuits (ICs), multiple constant current output channels are typically integrated, each independently driving a string of LEDs. Electrical isolation between channels is crucial to ensure display uniformity and reliability. However, in actual production or use, short circuits can occur between adjacent constant current output channels due to factors such as chip packaging defects, PCB wiring short circuits, solder bridging, or external stress. Once a short circuit occurs between channels, the output terminals of the two constant current sources are directly short-circuited, leading to abnormal current distribution, LED brightness distortion, and even burning out the driver IC.

[0029] Currently, the existing technology for detecting short circuit faults between two constant current output channels mainly relies on manual inspection using a current probe. Specifically, the tester needs to touch the pins or test points of each pair of adjacent channels one by one with the current probe, and determine whether there is a short circuit by observing whether the current reading is abnormal. When the number of channels of the driver IC is large (e.g., 32 channels, 48 ​​channels or even more), the number of adjacent channel pairs increases linearly, resulting in a surge in testing work and low overall testing efficiency.

[0030] To address the aforementioned issues, this application provides a method for detecting short circuits between adjacent channels. This method can automatically detect whether a short circuit fault exists between two adjacent constant current output channels, eliminating the need for manual troubleshooting and significantly improving detection efficiency. Figure 1 As shown, the specific steps include: Step 101: Determine the first constant current output channel and the second constant current output channel that are adjacent to each other from the constant current output channels connected to the driver IC.

[0031] Among them, such as Figure 2 As shown, a driver IC, such as an LED driver chip, is used to control the light emission of LED beads. The driver IC includes multiple pins. One end of each constant current output channel is connected to the corresponding pin, and the other end is connected to the LED bead, thereby driving the LED bead to emit light through the current provided by the constant current output channel. The LED bead can be an LED bead or other types of LED beads. The first and second constant current output channels are adjacent, for example, channel 1 and channel 2, channel 2 and channel 3, channel 3 and channel 4, and so on.

[0032] In this step, the multiple constant current output channels of the driver IC are arranged in order of pin number (e.g., channel 1, channel 2... channel N). Channels with consecutive numbers can be considered to be adjacent to each other, such as channel 1 and channel 2, channel 2 and channel 3, etc. During detection, each pair of adjacent channels can be selected sequentially as the first constant current output channel and the second constant current output channel to perform the subsequent short-circuit detection steps.

[0033] Furthermore, in practice, to achieve rapid detection, multiple pairs of non-overlapping adjacent constant current output channels on the driver IC can be simultaneously used as the first and second constant current output channels. For example, in the first round, channels 1 and 2, channels 3 and 4, channels 5 and 6 are paired respectively, and the current application and parameter acquisition steps are performed in parallel; in the second round, channels 2 and 3, channels 4 and 5, channels 6 and 7 are paired respectively, and the detection is performed in parallel again. By conducting two rounds of parallel detection, all adjacent channel pairs can be covered. This allows for the short-circuit detection of multiple channel pairs to be completed at once without significantly increasing the detection time, greatly improving detection efficiency.

[0034] Step 102: Apply a first driving current to the first constant current output channel and apply a second driving current to the second constant current output channel.

[0035] The first driving current drives the LED corresponding to the first constant current output channel, and the second driving current drives the LED corresponding to the second constant current output channel. The average value and / or PWM (Pulse Width Modulation) frequency of the first and second driving currents are different. The PWM frequency, measured in Hertz (Hz), refers to the switching frequency during pulse width modulation of the driving current, and it determines the switching rate of the LED. The average value is the time integral average of the driving current within one PWM cycle, determined by the product of the constant current peak current and the PWM duty cycle, directly affecting the steady-state brightness of the LED. The PWM cycle is the reciprocal of the PWM frequency; for example, when the PWM frequency is 1kHz, the PWM cycle is 1ms. The constant current peak current is the constant output current value set by the driver IC, for example, it can be set to 20mA. The PWM duty cycle is the ratio of the high-level conduction time to the cycle time within one cycle, ranging from 0% to 100%.

[0036] In this step, the constant current peak current set by the driver IC for each channel is usually the same. To make the average current of the two channels different, different PWM duty cycles can be configured for them. For example, if the PWM duty cycle of the first constant current output channel is set to 100% and the PWM duty cycle of the second constant current output channel is set to 50%, then the average current of the second constant current output channel is half that of the first constant current output channel.

[0037] And / or, by configuring the PWM frequency register inside the driver IC or an external clock divider, different PWM frequencies can be set for different channels. For example, the PWM frequency of the first drive current can be set to 1kHz, and the PWM frequency of the second drive current can be set to 2kHz.

[0038] Step 103: Obtain the target detection parameters of the first constant current output channel and / or the second constant current output channel.

[0039] The target detection parameters include the feedback voltage or the brightness value of the LED driven by the constant current output channel. The feedback voltage refers to the voltage at the output terminal of the constant current output channel relative to ground, and its value is equal to the forward voltage drop of the LED (if the LED cathode is grounded, the anode voltage is the forward voltage drop). For example, if the forward voltage drop is 2.0V, then the feedback voltage is 2.0V. The brightness value is used to measure the luminous intensity of the LED.

[0040] The selection of target detection parameters is related to the specific application scenario. For example, in practical applications, the display device is already packaged, making it difficult to add external optical acquisition equipment. Therefore, feedback voltage can only be used, or is preferred, to detect short circuit faults between channels. However, in production testing scenarios, the driver IC has not yet been installed in the final device, and a large number of products need to be tested. In this case, an external optical acquisition device can be introduced to determine short circuit faults between channels by acquiring the brightness values ​​of the LED beads. Although optical detection requires additional equipment and data processing, increasing the complexity of the detection process, its advantage lies in its ability to simultaneously detect faults in the LED beads themselves (such as open circuits and short circuits) and short circuit faults between channels, thereby discovering multiple problems in a single test and enabling targeted troubleshooting.

[0041] When the target detection parameter is a feedback voltage, this feedback voltage can be directly acquired by the driver IC. Therefore, the execution entity can be the driver IC itself. In this way, when the driver IC receives a command indicating whether a short circuit fault exists between detection channels, the driver IC can automatically acquire the feedback voltage and determine whether a short circuit has occurred between the channels based on it. Alternatively, it can be an MCU controller connected to the driver IC. In this way, when the MCU controller receives a command indicating whether a short circuit fault exists between detection channels, the MCU controller can receive the feedback voltage acquired by the driver IC and determine whether a short circuit has occurred between the channels based on it.

[0042] When the target detection parameter is a brightness value, these parameters need to be acquired by external optical acquisition equipment. Since the driver IC usually does not have the ability to process optical signals, the execution entity is an MCU controller or a device with complex computing functions (such as a digital signal processor, host computer, etc.). The MCU or computing device receives the brightness value acquired by the optical acquisition equipment and analyzes it to determine whether there is a short circuit fault between channels.

[0043] Among them, the optical acquisition equipment includes photoelectric sensors, cameras and other devices, which are used to acquire the brightness value of the lamp beads driven by the constant current output channel in real time.

[0044] Furthermore, to facilitate data processing and fault location, each target detection parameter should be associated with its corresponding channel number during acquisition and storage. When the execution entity needs to detect channels on multiple driver ICs, each target detection parameter also needs to be associated with the unique ID number of that driver IC. By combining the channel number with the driver IC's ID number, detection data from different channels on different driver ICs can be accurately distinguished, avoiding data confusion.

[0045] Step 104: Detect whether there is a short circuit fault between the first constant current output channel and the second constant current output channel, based on whether the target detection parameters meet the preset short circuit detection conditions.

[0046] The preset short-circuit detection condition is used to determine whether there is a short-circuit fault between the first constant current output channel and the second constant current output channel. It can be that the absolute difference between the feedback voltages of the two channels is less than or equal to a preset voltage difference threshold, the change in the feedback voltage relative to the normal operating voltage is greater than or equal to a preset voltage change threshold, or the difference in brightness between the two channels is less than a preset brightness difference, etc.

[0047] In this step, if the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is determined to exist between the first constant current output channel and the second constant current output channel. If the target detection parameters do not meet the preset short-circuit detection conditions, no short-circuit fault is determined to exist between the first constant current output channel and the second constant current output channel.

[0048] In addition, when a short-circuit fault occurs in a channel pair, its corresponding channel number and driver IC ID number can be sent to the equipment used by the relevant technicians, so that the technicians can identify the faulty channel based on this information and repair it.

[0049] In this embodiment, a first constant current output channel and a second constant current output channel that are adjacent to each other are determined from the constant current output channels connected to the driver IC. A first driving current is applied to the first constant current output channel, and a second driving current is applied to the second constant current output channel. The average value and / or PWM frequency of the first and second driving currents are different from each other. Target detection parameters of the first constant current output channel and / or the second constant current output channel are obtained. The target detection parameters include feedback voltage or the brightness value of the LED driven by the constant current output channel. Based on whether the target detection parameters meet a preset short-circuit detection condition, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel. Therefore, this application can automatically detect whether a short-circuit fault exists between two adjacent constant current output channels without requiring manual inspection, significantly improving detection efficiency.

[0050] In this embodiment, when the average driving currents of the two constant current output channels are set to different values, if a short circuit fault occurs between the two channels, their feedback voltages will tend to be consistent; conversely, if there is no short circuit fault, their feedback voltages will remain unequal. Therefore, this embodiment provides a detection method, the specific steps of which include: when the average values ​​of the first driving current and the second driving current are different, acquiring the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel; determining the absolute voltage difference between the first feedback voltage and the second feedback voltage; when the absolute voltage difference is less than or equal to a preset voltage difference threshold, determining that a short circuit fault exists between the first constant current output channel and the second constant current output channel; when the absolute voltage difference is greater than the preset voltage difference threshold, determining that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0051] The preset voltage difference threshold is set based on the experience of technicians to determine whether the feedback voltages of the two channels are close enough. Its value can be set according to the power supply voltage of the driver IC, the forward voltage drop of the LED, and the detection accuracy requirements. For example, it can be set to 0.1V or 0.2V.

[0052] In this step, the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel are collected. The first and second feedback voltages are subtracted, and the absolute value is taken to obtain the absolute voltage difference. When the absolute voltage difference is less than or equal to a preset voltage difference threshold, it indicates that the first and second constant current output channels are short-circuited, forcing their feedback voltages to have almost no difference. Therefore, it is determined that there is no short circuit fault between the first and second constant current output channels. When the absolute voltage difference is greater than the preset voltage difference threshold, it indicates that the feedback voltages of the first and second constant current output channels still maintain a significant difference, consistent with the situation under normal operation. Therefore, it is determined that there is no short circuit fault between the first and second constant current output channels.

[0053] In this embodiment, when the average driving current of the two constant current output channels is set to different values, if a short circuit fault occurs between the two channels, the feedback voltage of the detected channel will deviate from its preset voltage value during normal operation, because the short circuit will cause current injection or voltage clamping in the other channel; conversely, if there is no short circuit fault, the feedback voltage of the channel should remain basically consistent with the preset normal operating voltage. Therefore, this embodiment provides another detection method, the specific steps of which include: when the average value of the first driving current and the second driving current is different, acquiring the target feedback voltage of the target constant current output channel, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; determining the voltage change of the target feedback voltage relative to the preset normal operating voltage; when the voltage change is greater than or equal to a preset voltage change threshold, determining that there is a short circuit fault between the first constant current output channel and the second constant current output channel; when the voltage change is less than the preset voltage change threshold, determining that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0054] The preset normal operating voltage refers to the feedback voltage value that the constant current output channel should output when there is no short-circuit fault and the corresponding drive current is applied. It can be obtained through theoretical calculation. The preset voltage change threshold is set based on the experience of technicians and is used to determine whether the feedback voltage has deviated significantly. Its value can be set according to the power supply voltage of the driver IC, the consistency of the forward voltage drop of the LED beads, and the detection sensitivity requirements. For example, it can be set to 0.15V or 0.3V.

[0055] In this step, the target feedback voltage of the target constant current output channel is acquired. This target feedback voltage is subtracted from the preset normal operating voltage, and the absolute value is taken to obtain the voltage change. When the voltage change is greater than or equal to the preset voltage change threshold, it indicates that the feedback voltage of this channel is pulled off due to a short circuit in a neighboring channel. Therefore, it is determined that there is a short circuit fault between the first and second constant current output channels. When the voltage change is less than the preset voltage change threshold, it indicates that the feedback voltage of this channel is basically consistent with that during normal operation and is not significantly affected by neighboring channels. Therefore, it is determined that there is no short circuit fault between the first and second constant current output channels.

[0056] In this embodiment, when there are multiple first constant current output channels and multiple second constant current output channels, the average driving current of all first constant current output channels is set to the same value, the average driving current of all second constant current output channels is set to the same value, and the average driving current of the second constant current output channels is different from that of the first constant current output channels, if a short circuit fault occurs between the constant current output channels in a certain constant current output channel pair, the feedback voltage of that constant current output channel will deviate from the normal value; otherwise, the feedback voltage of that constant current output channel will remain normal. Therefore, this application provides another detection method, the specific steps of which include: when there are multiple first constant current output channels, and the average values ​​of the first driving current and the second driving current are different, collecting the target feedback voltage corresponding to each target constant current output channel to form a feedback voltage sequence, wherein the target constant current output channel is a first constant current output channel or a second constant current output channel; traversing the feedback voltage sequence to detect whether there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds a preset deviation threshold; when there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, determining that there is a short circuit fault between the first constant current output channel and the second constant current output channel corresponding to the abnormal feedback voltage; when there is no abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, determining that there is no short circuit fault between all first constant current output channels and the corresponding second constant current output channels.

[0057] Since the average driving current of all first channels is the same, their feedback voltages should ideally be basically consistent. The preset feedback voltage can be taken as the statistical median or average of the feedback voltages of all first channels. The preset deviation threshold is set based on the experience of technicians and is used to determine whether the feedback voltage of a certain channel has deviated significantly due to a short circuit. Its magnitude can be set according to factors such as the dispersion of the forward voltage drop of the LED and the detection sensitivity requirements. For example, it can be set to 0.1V or 0.2V.

[0058] In this step, the feedback voltage of each target constant current output channel is collected sequentially to form a feedback voltage sequence. Each value in this feedback voltage sequence is compared with a preset feedback voltage, and the absolute value of the deviation corresponding to each value is calculated. When the absolute value of a deviation is greater than or equal to a preset deviation threshold, it indicates that the feedback voltage of the constant current output channel corresponding to that absolute value is abnormal, most likely due to a short circuit with an adjacent constant current output channel. Therefore, the feedback voltage corresponding to that absolute value is identified as the abnormal feedback voltage, and the first and second constant current output channels corresponding to this abnormal feedback voltage are identified, thus determining that a short circuit fault exists between them. If all absolute values ​​of deviation are less than the preset deviation threshold, it indicates that the feedback voltage of all constant current output channels is normal, and there is no short circuit fault with an adjacent constant current output channel.

[0059] In this embodiment, when the average values ​​of the first driving current and the second driving current are different, and the current difference between them exceeds a preset current difference threshold, the brightness of the LEDs driven by the two channels will show a significant difference under normal conditions (because the brightness of the LEDs is positively correlated with the average value of the driving current). If a short circuit fault occurs between the two channels, the output terminals of the two constant current sources are short-circuited, causing the driving currents of the two LEDs to affect each other. This results in the brightness of the LED with higher brightness decreasing and the brightness of the LED with lower brightness increasing, eventually bringing the brightness of the two LEDs closer together. Conversely, if there is no short circuit fault, the brightness of the two LEDs should maintain a significant difference. Therefore, this application provides another detection method, the specific steps of which include: when the average values ​​of the first driving current and the second driving current are different, and the current difference between the two exceeds a preset current difference threshold, receiving an optical acquisition device to acquire a first brightness value of the lamp bead driven by the first constant current output channel and a second brightness value of the lamp bead driven by the second constant current output channel; determining the absolute brightness difference between the first brightness value and the second brightness value; when the absolute brightness difference is less than a preset brightness threshold, determining that there is a short circuit fault between the first constant current output channel and the second constant current output channel; when the absolute brightness difference is greater than or equal to the preset brightness threshold, determining that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0060] The steps for determining the brightness value are as follows: An optical acquisition device (such as a luminance meter, photoelectric sensor, or camera) is aimed at the LEDs driven by the first constant current output channel and the second constant current output channel, respectively. Under the same ambient lighting conditions, the steady-state brightness or average brightness of each LED is measured. Specifically, the optical acquisition device converts the received light signal into an electrical signal, which is then converted from analog to digital to obtain the brightness value, expressed in candela per square meter (cd / m²) or lux (Lux). To improve detection accuracy, measurements can be repeated at multiple time points, and the average value can be taken as the final brightness value.

[0061] The preset brightness threshold is determined based on the current difference between the first driving current and the second driving current. Since the brightness of the LED bead is linearly related to the average value of the driving current within a certain range, the theoretical absolute difference in brightness between the two channels during normal operation can be obtained through pre-calibration or theoretical calculation. A threshold smaller than this theoretical difference (e.g., 50% or lower of the theoretical difference) is then set as the preset brightness threshold.

[0062] In this step, the optical acquisition device acquires the first brightness value of the LED driven by the first constant current output channel and the second brightness value of the LED driven by the second constant current output channel, and calculates the absolute difference in brightness between the two values. When the absolute difference in brightness is less than a preset brightness threshold, it indicates that the actual brightness of the two LEDs is closer than normal. This is due to the current redistribution caused by a short circuit between the channels, therefore, it is determined that there is a short circuit fault between the first and second constant current output channels. When the absolute difference in brightness is greater than or equal to the preset brightness threshold, it indicates that the brightness difference between the two LEDs is consistent with normal conditions and is not affected by a short circuit, therefore, it is determined that there is no short circuit fault between the two channels.

[0063] In this embodiment, when the PWM frequencies of the first driving current and the second driving current are different, and the frequency difference between them exceeds a preset frequency difference threshold, the brightness change waveforms of the LEDs driven by the two channels under normal conditions exhibit their own independent PWM pulse waveforms. Their specific shapes depend on the output characteristics of the driver IC and can be rectangular waves, trapezoidal waves, or other periodic waveforms. If a short circuit occurs between the two channels, the currents of the two different PWM frequencies will superimpose on the load, generating a special low-frequency modulation phenomenon—beat envelope. Specifically, after a short circuit, the current waveform flowing through the LED is a linear superposition of two currents with different PWM frequencies, and its envelope changes periodically with two frequencies, causing the LED brightness to fluctuate slowly. This periodic change contour is the beat envelope characteristic. Conversely, if there is no short circuit, each LED is only driven by the current of its own channel, and the brightness change waveform is a single-frequency pulse waveform without a low-frequency envelope. Therefore, this application provides another detection method, the specific steps of which include: when the PWM frequencies of the first driving current and the second driving current are different and the frequency difference between them exceeds a preset frequency difference threshold, receiving optical acquisition devices to acquire the target brightness value of the lamp beads driven by the target constant current output channel at multiple acquisition time points to obtain a brightness change sequence, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; detecting whether there is a beat frequency envelope feature in the brightness change waveform corresponding to the brightness change sequence; when the beat frequency envelope feature exists in the brightness change waveform, determining that there is a short circuit fault between the first constant current output channel and the second constant current output channel; when the beat frequency envelope feature does not exist in the brightness change waveform, determining that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0064] The detection steps for beat frequency envelope features are as follows: First, determine the PWM frequency of the current corresponding to the LED bead to be sampled, and control an optical acquisition device (such as a high-speed photoelectric sensor, camera, or optical power meter) to continuously acquire the brightness value of a certain LED bead at a sampling rate at least twice higher than the PWM frequency (satisfying the Nyquist sampling theorem). Record the brightness data at multiple acquisition time points to form a brightness change sequence. Then, an envelope detection algorithm (such as Hilbert transform, low-pass filtering, or peak detection) can be used to extract the envelope of the brightness signal; or, a Fast Fourier Transform (FFT) can be directly performed on the sequence to analyze whether a low-frequency component of a specified frequency exists in its spectrum. If the envelope shows obvious periodic fluctuations, or a significant peak appears in the spectrum near the specified frequency, then a beat frequency envelope feature is determined to exist. Conversely, if the envelope is flat (containing only high-frequency PWM ripple) or there is no significant low-frequency component in the spectrum, then a beat frequency envelope feature is determined not to exist.

[0065] It should be noted that the sampling duration must cover at least one complete beat frequency cycle, i.e., at least 1 / |f1 - f2| seconds, in order to capture the complete envelope fluctuations. f1 is the PWM frequency of the first drive current, and f2 is the PWM frequency of the second drive current. The specified frequency is |f1 - f2|.

[0066] In this step, the receiving optical acquisition device acquires the target brightness values ​​of the LEDs driven by the target constant current output channel at multiple acquisition time points, obtaining a brightness change sequence. Envelope detection or spectrum analysis is performed on this sequence to determine whether beat frequency envelope characteristics exist. If present, it indicates that the PWM currents of the two channels are mutually coupled, i.e., a short circuit fault has occurred between the channels; therefore, it is determined that a short circuit fault exists between the first and second constant current output channels. If absent, it indicates that each channel operates independently without a short circuit; therefore, it is determined that no short circuit fault exists between the two channels.

[0067] In this embodiment of the application, after determining the channel with a short circuit fault and the channel without a short circuit fault, the channel without a short circuit fault can be allowed to enter a preset state. The specific steps include: applying a third driving current to the first constant current output channel and the second constant current output channel so that the lamps driven by the first constant current output channel and the second constant current output channel respectively enter a preset visual indication state.

[0068] The third driving current can be the same as or different from the first or second driving current. Its core purpose is to enable the LEDs driven by channels without short-circuit faults to produce a visual state different from the off state, so as to facilitate fault identification. The preset visual indication states specifically include flashing state, constant light state, high brightness state, and high brightness flashing state.

[0069] In this step, when a short circuit fault is detected between a pair of channels, the faulty channel pair is first shut down to prevent damage caused by continuous power supply to the short-circuit circuit. Then, a third driving current is applied to the remaining un-short-circuited channels, causing the LEDs they drive to enter a preset visual indication state.

[0070] like Figure 3 As shown, this application embodiment provides an adjacent channel short-circuit detection device, which corresponds to the method embodiment, and specifically includes: The determining unit 301 is used to determine a first constant current output channel and a second constant current output channel that are adjacent to each other from the constant current output channels connected to the driver IC. The first application unit 302 is used to apply a first driving current to the first constant current output channel and a second driving current to the second constant current output channel, wherein the average value of the first driving current and the second driving current and / or the PWM frequency are different from each other. The acquisition unit 303 is used to acquire target detection parameters of the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include feedback voltage or the brightness value of the lamp bead driven by the constant current output channel; The detection unit 304 is used to detect whether there is a short circuit fault between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions.

[0071] Optionally, when the average value of the first drive current and the second drive current is different, the acquisition unit 303 is configured to: Collect the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel; The detection unit 304 is used for: Determine the absolute voltage difference between the first feedback voltage and the second feedback voltage; When the absolute voltage difference is less than or equal to a preset voltage difference threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the absolute voltage difference is greater than a preset voltage difference threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0072] Optionally, when the average value of the first drive current and the second drive current is different, the acquisition unit 303 is configured to: The target feedback voltage of the target constant current output channel is acquired, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The detection unit 304 is used for: Determine the voltage change of the target feedback voltage relative to the preset normal operating voltage; When the voltage change is greater than or equal to a preset voltage change threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the voltage change is less than a preset voltage change threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0073] Optionally, when there are multiple first constant current output channels, and the average values ​​of the first drive current and the second drive current are different, the acquisition unit 303 is used to: The target feedback voltage corresponding to each target constant current output channel is collected to form a feedback voltage sequence, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The detection unit 304 is used for: Traverse the feedback voltage sequence to detect whether there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds a preset deviation threshold; When there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel corresponding to the abnormal feedback voltage. When there is no abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is no short circuit fault between all first constant current output channels and the corresponding second constant current output channels.

[0074] Optionally, when the average values ​​of the first driving current and the second driving current are different, and the current difference between them exceeds a preset current difference threshold, the acquisition unit 303 is used to: The receiving optical acquisition device acquires the first brightness value of the lamp bead driven by the first constant current output channel and the second brightness value of the lamp bead driven by the second constant current output channel; The detection unit 304 is used for: Determine the absolute difference in brightness between the first brightness value and the second brightness value; When the absolute difference in brightness is less than a preset brightness threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel; When the absolute difference in brightness is greater than or equal to a preset brightness threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0075] Optionally, when the PWM frequencies of the first drive current and the second drive current are different, and the frequency difference between them exceeds a preset frequency difference threshold, the acquisition unit 303 is used to: The receiving optical acquisition device acquires the target brightness value of the lamp bead driven by the target constant current output channel at multiple acquisition time points to obtain a brightness change sequence, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; The detection unit 304 is used for: Detect whether there is a beat frequency envelope feature in the brightness change waveform corresponding to the brightness change sequence; When the beat frequency envelope feature is present in the brightness change waveform, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the beat frequency envelope feature is not present in the brightness change waveform, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

[0076] Optionally, after determining that there is no short-circuit fault between the first constant current output channel and the second constant current output channel, the device further includes a second application unit 305, which is used to: A third driving current is applied to the first constant current output channel and the second constant current output channel so that the lamps driven by the first constant current output channel and the second constant current output channel respectively enter a preset visual indication state.

[0077] like Figure 4 As shown in the figure, this application provides an adjacent channel short-circuit detection device, including a processor 401, a communication interface 402, a memory 403, and a communication bus 404, wherein the processor 401, the communication interface 402, and the memory 403 communicate with each other through the communication bus 404. Memory 403 is used to store computer programs; In one embodiment of this application, when the processor 401 executes the program stored in the memory 403, it implements the adjacent channel short-circuit detection method provided in any of the foregoing method embodiments, including: From the constant current output channels connected to the driver IC, determine the first constant current output channel and the second constant current output channel that are adjacent to each other; A first drive current is applied to the first constant current output channel, and a second drive current is applied to the second constant current output channel, wherein the average value of the first drive current and the second drive current and / or the PWM frequency are different from each other; Obtain target detection parameters from the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include the feedback voltage or the brightness value of the LED driven by the constant current output channel; Based on whether the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel.

[0078] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps performed by the adjacent channel short-circuit detection method provided in any of the foregoing method embodiments.

[0079] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0081] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0082] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for detecting short circuits in adjacent channels, characterized in that, include: From the constant current output channels connected to the driver IC, determine the first constant current output channel and the second constant current output channel that are adjacent to each other; A first drive current is applied to the first constant current output channel, and a second drive current is applied to the second constant current output channel, wherein the average value of the first drive current and the second drive current and / or the PWM frequency are different from each other; Obtain target detection parameters from the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include the feedback voltage or the brightness value of the LED driven by the constant current output channel; Based on whether the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel.

2. The method according to claim 1, characterized in that, When the average value of the first driving current and the second driving current is different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: Collect the first feedback voltage of the first constant current output channel and the second feedback voltage of the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the absolute voltage difference between the first feedback voltage and the second feedback voltage; When the absolute voltage difference is less than or equal to a preset voltage difference threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the absolute voltage difference is greater than a preset voltage difference threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

3. The method according to claim 1, characterized in that, When the average value of the first driving current and the second driving current is different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The target feedback voltage of the target constant current output channel is acquired, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the voltage change of the target feedback voltage relative to the preset normal operating voltage; When the voltage change is greater than or equal to a preset voltage change threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the voltage change is less than a preset voltage change threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

4. The method according to claim 1, characterized in that, When there are multiple first constant current output channels, and the average values ​​of the first drive current and the second drive current are different, the step of obtaining the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The target feedback voltage corresponding to each target constant current output channel is collected to form a feedback voltage sequence, wherein the target constant current output channel is either the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Traverse the feedback voltage sequence to detect whether there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds a preset deviation threshold; When there is an abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel corresponding to the abnormal feedback voltage. When there is no abnormal feedback voltage whose deviation from the preset feedback voltage exceeds the preset deviation threshold, it is determined that there is no short circuit fault between all first constant current output channels and the corresponding second constant current output channels.

5. The method according to claim 1, characterized in that, When the average values ​​of the first driving current and the second driving current are different, and the current difference between them exceeds a preset current difference threshold, the step of acquiring the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The receiving optical acquisition device acquires the first brightness value of the lamp bead driven by the first constant current output channel and the second brightness value of the lamp bead driven by the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Determine the absolute difference in brightness between the first brightness value and the second brightness value; When the absolute difference in brightness is less than a preset brightness threshold, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel; When the absolute difference in brightness is greater than or equal to a preset brightness threshold, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

6. The method according to claim 1, characterized in that, When the PWM frequencies of the first drive current and the second drive current are different, and the frequency difference between them exceeds a preset frequency difference threshold, the step of acquiring the target detection parameters of the first constant current output channel and / or the second constant current output channel includes: The receiving optical acquisition device acquires the target brightness value of the lamp bead driven by the target constant current output channel at multiple acquisition time points to obtain a brightness change sequence, wherein the target constant current output channel is the first constant current output channel or the second constant current output channel; The step of detecting whether a short circuit fault exists between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions includes: Detect whether there is a beat frequency envelope feature in the brightness change waveform corresponding to the brightness change sequence; When the beat frequency envelope feature is present in the brightness change waveform, it is determined that there is a short circuit fault between the first constant current output channel and the second constant current output channel. When the beat frequency envelope feature is not present in the brightness change waveform, it is determined that there is no short circuit fault between the first constant current output channel and the second constant current output channel.

7. The method according to claim 1, characterized in that, After determining that there is no short-circuit fault between the first constant current output channel and the second constant current output channel, the method further includes: A third driving current is applied to the first constant current output channel and the second constant current output channel so that the lamps driven by the first constant current output channel and the second constant current output channel respectively enter a preset visual indication state.

8. A short-circuit detection device for adjacent channels, characterized in that, The device includes: The determining unit is used to determine a first constant current output channel and a second constant current output channel that are adjacent to each other from the constant current output channels connected to the driver IC. The first application unit is used to apply a first driving current to the first constant current output channel and a second driving current to the second constant current output channel, wherein the average value and / or PWM frequency of the first driving current and the second driving current are different from each other. The acquisition unit is used to acquire target detection parameters of the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include feedback voltage or the brightness value of the lamp bead driven by the constant current output channel; The detection unit is used to detect whether there is a short circuit fault between the first constant current output channel and the second constant current output channel based on whether the target detection parameters meet the preset short circuit detection conditions.

9. A short-circuit detection device for adjacent channels, characterized in that, include: At least one communication interface; At least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to: From the constant current output channels connected to the driver IC, determine the first constant current output channel and the second constant current output channel that are adjacent to each other; A first drive current is applied to the first constant current output channel, and a second drive current is applied to the second constant current output channel, wherein the average value of the first drive current and the second drive current and / or the PWM frequency are different from each other; Obtain target detection parameters from the first constant current output channel and / or the second constant current output channel, wherein the target detection parameters include feedback voltage or the brightness value of the LED driven by the constant current output channel; Based on whether the target detection parameters meet the preset short-circuit detection conditions, a short-circuit fault is detected between the first constant current output channel and the second constant current output channel.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the adjacent channel short-circuit detection method according to any one of claims 1 to 7.

Images