CN219715563U

CN219715563U - Backlight lamp panel and device for detecting multipath LED driver

Info

Publication number: CN219715563U
Application number: CN202322188943.9U
Authority: CN
Inventors: 边庆仙; 徐梦银; 李显安
Original assignee: Wuhan Jingce Electronic Group Co Ltd; Wuhan Jingli Electronic Technology Co Ltd
Current assignee: Wuhan Jingce Electronic Group Co Ltd; Wuhan Jingli Electronic Technology Co Ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2023-09-19
Anticipated expiration: 2033-08-15

Abstract

The utility model provides a backlight lamp panel and a device for detecting a multipath LED driver, and belongs to the technical field of electronic testing. According to the utility model, through the short circuit or the fit of the connecting circuit elements, the connection mode of each LED in the LED array is changed, the lighting condition of each LED corresponds to each path of output current when the tested multipath LED driver has constant current in different gears, the problems of high voltage and high current output by the tested piece, poor adaptability and damage to the tool are encountered, and the detection mode can flexibly adjust grouping according to the output requirement of the tested piece, so that the test efficiency is effectively improved. The detection device has wide adaptability, supports the output detection of multiple paths of constant-current power supplies and combines with the control module, and can greatly improve the working efficiency.

Description

Backlight lamp panel and device for detecting multipath LED driver

Technical Field

The utility model belongs to the technical field of electronic testing, and particularly relates to a backlight lamp panel and a device for detecting a multipath LED driver.

Background

In recent years, LED liquid crystal products are widely used in various applications. The quality of the liquid crystal backlight driver directly influences the quality of liquid crystal products, but the liquid crystal backlight driver is relatively easy to damage in an LED lighting system.

In order to ensure the safety, efficiency and reliability of the liquid crystal backlight driver, strict constant current test is usually required to be performed on the liquid crystal backlight driver in the research and development or production stage.

At present, because the constant source output of various LED drivers is different, the specification parameters and the channel number are different, when the LED drivers of different products are subjected to backlight detection, various backlight devices are required to be switched, the test platform is not uniform, and the test can only be manually accessed through a universal ammeter under the condition of no communication protocol, so that the problem of low test efficiency is caused.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a backlight lamp panel and a device for detecting a multipath LED driver, which aim to solve the problems of non-uniformity of the existing test platform and low manual test efficiency.

To achieve the above object, in a first aspect, the present utility model provides a backlight panel for multi-path LED driver detection, including: connecting the circuit element, the LED array and the first interface;

the connection circuit element changes the connection mode of each LED in the LED array through short circuit or cutting;

the LED array is in butt joint with the output interfaces of the tested multi-path LED driver through the first interface, and the lighting condition of each LED corresponds to each path of output current when the tested multi-path LED driver is constant current in different gears.

Preferably, the LED array comprises a plurality of groups of LEDs connected in parallel, and each group of LEDs is formed by connecting a plurality of LEDs in series or connecting a plurality of LEDs in series after grouping the plurality of LEDs again.

The detection accuracy can be further improved by grouping the groups.

Preferably, when the LEDs are grouped again and then connected in series, the parallel grouping is adjusted according to the output current of the tested multi-path LED driver, and the serial number of each group of LEDs is adjusted according to the output voltage of the tested multi-path LED driver.

Preferably, the LEDs in the LED array are connected in series, parallel or series-parallel.

Preferably, the connection circuit element is a jumper cap shorting a single group of LEDs or a single LED.

Preferably, the connection circuit element is an electromagnetic relay, and the backlight panel further includes: the singlechip and the second interface;

the singlechip is electrically connected with the power adapter through a second interface;

the singlechip is in communication connection with the electromagnetic relay and is used for receiving the control instruction and controlling the switching of the electromagnetic relay according to the control instruction so as to change the connection mode of each LED.

Preferably, the backlight panel further comprises: and the light diffusion plate is covered on the LED array and used for diffusing light after lighting.

To achieve the above object, in a second aspect, the present utility model provides an apparatus for multi-path LED driver detection, comprising:

the backlight panel of the first aspect, interfacing with a tested multi-way LED driver output interface;

the control module is in communication connection with the tested multipath LED driver and is used for controlling the tested multipath LED driver to perform constant current output with different gears.

Preferably, the control module is a built-in control board, and the device further comprises: an operation panel connected to the control panel;

the operation panel includes: a plurality of keys and a display screen;

the key is used for receiving the settings of different constant current output gears and current precision from a user;

the display screen is used for displaying the currently set parameters, and warning and displaying the fault reasons when the LEDs in the backlight panel are in fault.

Preferably, the control module monitors the output of the tested multipath LED driver, and if the output exceeds an overcurrent preset threshold, an overvoltage preset threshold or an overpower preset threshold, the constant current test is automatically turned off.

It should be noted that, the stability is improved due to the overvoltage, overcurrent, and overcurrent protection mechanisms and the LEDs with strong carrying capacity in the backlight panel.

In general, the above technical solutions conceived by the present utility model have the following beneficial effects compared with the prior art:

the utility model provides a backlight lamp panel and a device for detecting a multipath LED driver, which change the connection mode of each LED in an LED array through the short circuit or the fit of a connecting circuit element, the lighting condition of each LED corresponds to each path of output current when the tested multipath LED driver has different gear constant currents, and the problems of high voltage and large current output by a tested piece, poor adaptability and damage to a tool are encountered. The detection device has wide adaptability, supports the output detection of multiple paths of constant current power supplies and combines with the control module, and can greatly improve the working efficiency.

Drawings

Fig. 1 is a schematic diagram of a backlight panel structure for multi-path LED driver detection according to the present utility model.

Fig. 2 is a schematic diagram of an apparatus for detecting multiple LED drivers according to the present utility model.

The main reference symbols in the drawings indicate: 1. a backlight panel; 2. a first interface; 3. an LED; 4. a light-diffusing plate; 5. a housing.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1, the present utility model provides a backlight panel 1 for multi-path LED driver detection, comprising: a connection circuit element (not shown in the figure), an LED array and a first interface 2.

The connection circuit element changes the connection mode of each LED 3 in the LED array through short circuit or cutting.

Preferably, the connection circuit element is an electromagnetic relay, and the backlight panel further includes: the singlechip and the second interface; the singlechip is electrically connected with the power adapter through a second interface; the singlechip is in communication connection with the electromagnetic relay and is used for receiving the control instruction and controlling the switching of the electromagnetic relay according to the control instruction so as to change the connection mode of each LED.

Preferably, the backlight panel further comprises: and a light diffusing plate 4 covering the LED array for diffusing light after lighting.

The entire backlight panel may be integrated by the housing 5.

As shown in fig. 2, the present utility model provides an apparatus for multi-path LED driver detection, comprising:

the backlight lamp panel is in butt joint with the output interfaces of the tested multipath LED drivers;

Preferably, the control module is a built-in control board, and the device further comprises: and an operation panel connected with the control panel.

The operation panel includes: a plurality of keys and a display screen; the key is used for receiving the settings of different constant current output gears and current precision from a user; the display screen is used for displaying the currently set parameters, and warning and displaying the fault reasons when the LEDs in the backlight panel are in fault.

Examples

In embodiment 1, 120 second-generation white\standard color rendering index\forward voltage@350mA and 85 ℃ high-power patch light-emitting diodes are adopted for the backlight lamp panel, so that strong stability is provided for the backlight lamp panel. The number of LEDs in the lamp panel is not limited to 120, and can be determined according to the output parameter requirement of the tested piece and the rated value of the LEDs. The type of LED is not limited to a white LED, but may be an RGB LED. In this embodiment, the connection mode of the LED is changed by shorting the jumper cap or switching the relay.

In the embodiment 2, the LEDs are divided equally in a series-parallel manner, and then the LEDs are grouped and connected in parallel, and then the LEDs are connected in series in each group.

The backlight lamp panel can bear higher voltage and larger current, and meanwhile, grouping can be manually or automatically adjusted according to the requirements of detection channels, so that the device has multiple channels and has stronger adaptability.

The light-diffusing plate mainly plays a role in diffusing light, and after the LED array is lightened and passes through the light-diffusing plate, the light can be scattered on the surface of the light-diffusing plate, so that the light becomes softer.

In embodiment 3, the control module is UI software for LED driver product detection, and has power supply monitoring and protection functions. When in detection, a constant voltage or constant current detection mode can be selected according to the model of the detected piece, a corresponding test file is issued, the power output of the LED driver of the detected piece is controlled, the output voltage and current are monitored, and the backlight lamp panel has overvoltage, overcurrent and overpower protection functions.

The commercial power is converted into a 28V direct current stabilized power supply through a power adapter, and the power is supplied to the test fixture. The tested piece and the power panel are spliced in the test tool together. The control module transmits the constant current test file to the signal board of the test tool, and the signal board of the test tool identifies the configuration parameters in the constant current test file, so that the power panel of the tested piece is controlled to be adjusted according to the configuration parameters, and the tested piece is enabled to perform constant current output according to the configuration parameters. The constant current output gear can be manually switched, and automatic cycle switching can also be set in test software.

And issuing a corresponding test file according to the model of the tested piece and the test platform, wherein the test file is a test parameter file configured according to the product requirement and can be directly used for testing. The test parameters include: channel number, current gear, e.g., 1mA gear, 10mA gear, 30mA gear, 50mA gear, etc. The current gear is different, and the current precision requirement is also different.

When the test file fails to be issued, the UI test software prompts the checking device to connect. After the file is successfully issued, the backlight lamp panel is in butt joint with the output interface of the tested piece through the direct-connection wire rod, and the backlight lamp panel can be adjusted according to the output channel number of the tested piece. It is assumed that the tested piece has 4 channels to output, taking a single channel as an example, parallel grouping can be adjusted according to output current, the serial number of LEDs in each group can be adjusted according to output voltage, and connection of other channels can be duplicated in the mode.

The following are illustrated: when the voltage is 3.3V and the current is 20mA, the series connection in the group can be directly selected; when the current is more than 50mA, the brightness of the LEDs is obviously changed, the LEDs can be selected to be grouped again in a group and then connected in series, and the LEDs are mainly properly adjusted according to the current output by the tested piece, so that the LEDs are convenient for detection personnel to observe.

The number of series-connected LEDs in the group is influenced by the rated value of the LEDs. When the circuit voltage is larger than the rated reverse voltage (for example, 0.6V, the rated reverse voltages of different specifications have differences), the LEDs are lightened, and the circuit voltage is 3.3V at the moment, so the number of LEDs connected in series in the group cannot exceed 5, otherwise, the LEDs in the group cannot be lightened.

After the backlight panel is confirmed to be correct, clicking to start testing. The tested piece is output according to the parameter configuration in the test file, and the test software monitors the output of the tested piece. When the output of the tested piece is abnormal or exceeds the voltage and current alarm threshold, the UI test software automatically turns off the test, and the backlight lamp panel is protected. And when the test piece is normally output, the LEDs in the backlight lamp panel are lightened, and the backlight driving load capacity of the test piece is detected. Specifically, the working state of the LEDs in the backlight panel is observed by switching and outputting constant current gear. 1) Abnormal lighting, particularly when a certain group of LEDs are dark, the tested multi-path LED driver has smaller output current; 2) Abnormal lighting, particularly when a certain group of LEDs are in a bright state, the tested multi-path LED driver is indicated to have larger output current of the path; 3) Abnormal lighting is particularly shown as that a certain group of LEDs are not lightened, which indicates that the tested multi-path LED driver has no current output, or the group of LEDs of the backlight module are damaged, or the current of the LED driver is larger and exceeds a current threshold protection value.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims

1. A backlight panel for multi-way LED driver detection, comprising: connecting the circuit element, the LED array and the first interface;

2. The backlight panel according to claim 1, wherein the LED array comprises a plurality of groups of LEDs connected in parallel, each group of LEDs being connected in series by a plurality of LEDs or being grouped again by a plurality of LEDs and connected in series.

3. The backlight panel of claim 2, wherein when the plurality of LEDs are grouped again and connected in series, the parallel grouping is adjusted according to the output current of the tested multi-path LED driver, and the serial number of each group of LEDs is adjusted according to the output voltage of the tested multi-path LED driver.

4. The backlight panel of claim 1, wherein the LEDs in the LED array are connected in series, parallel or series-parallel.

5. The backlight panel of claim 1, wherein the connection circuit element is a jumper cap that shorts a single group of LEDs or a single LED.

6. The backlight panel according to claim 1, wherein the connection circuit element is an electromagnetic relay, the backlight panel further comprising: the singlechip and the second interface;

7. The backlight panel of claim 1, wherein the backlight panel further comprises: and the light diffusion plate is covered on the LED array and used for diffusing light after lighting.

8. An apparatus for multiplexed LED driver detection, comprising:

the backlight panel of any one of claims 1 to 7, interfacing with a tested multi-way LED driver output interface;

9. The apparatus of claim 8, wherein the control module is a built-in control board, the apparatus further comprising: an operation panel connected to the control panel;

the operation panel includes: a plurality of keys and a display screen;

10. The apparatus of claim 8, wherein the control module monitors the output of the tested multi-way LED driver and automatically shuts down the constant current test if the over-current preset threshold, the over-voltage preset threshold, or the over-power preset threshold is exceeded.