An automatic acquisition system for LED life characteristic parameters

Abstract

The invention discloses an automatic acquisition system for characteristic parameters of LED life, comprising an LED life test module and a disc test bench for placing an LED to be tested, wherein a mechanical arm is arranged on the test bench, a detection module is arranged on the mechanical arm, and an actuator for driving the mechanical arm to move is also arranged on the mechanical arm; the actuator comprises a rotation actuator for driving the mechanical arm to rotate, a radial telescopic actuator for driving the mechanical arm to move radially along the disc test bench, and an axial telescopic actuator for driving the mechanical arm to move axially along the disc test bench. The mechanism enables the test system to achieve the purpose of expanding the test sample space through reasonable topological expansion through the radial telescopic actuator and the axial telescopic actuator, so that the life evaluation result is more effective. At the same time, the device uses an illuminance meter to measure the illuminance, and the illuminance can be converted with the luminous flux through a functional relationship, so that the acquisition of the luminous flux is simpler and more accurate.

Description

Technical Field

[0001] The invention relates to the field of LED life detection, and in particular to an automatic acquisition system for characteristic parameters of LED life. Background Art

[0002] In the prior art, LED can convert electrical energy into light energy. It has the characteristics of high efficiency, pure light color, flexible application, and high light quality. Therefore, it is used as a light source in many optoelectronic control devices and as a signal display in electronic equipment.

[0003] However, during the use of LED, due to the influence of current and external environment, it will inevitably age. The aging of LED mainly includes the aging of chip and the aging of package. The aging mechanism of chip includes the enhancement of thermomechanical stress caused by heat accumulation, the expansion of chip cracks, and the complete detachment of chip bonding layer from the bonding surface due to poor process. The aging mechanism of package is mainly that high temperature and humidity lead to the degradation of packaging materials, water vapor penetrates into the interior of packaging materials, causing lead deterioration and rust of PCB copper wires, and the mobile conductive ions introduced by water vapor will reside on the surface of the chip, causing leakage. The luminous efficiency of aging LED lamps will be greatly reduced, the purity of light color will decrease, and even burn out.

[0004] However, the aging of LEDs is not easy to directly observe and judge, and it is not easy to judge through all tests due to the huge number of applications. As a modern energy-saving and environmentally friendly lamp, once it ages or burns out, the circuit will lose its indication function, which will have a huge impact on maintenance work. This phenomenon poses a major safety hazard to some important circuits.

[0005] Although the LED detection system has been developed after research and development, the feature quantity acquisition module still has the following problems:

[0006] 1. At present, when collecting the characteristic parameter luminous flux of LED, the statistical life assessment method requires a sufficiently large number of test samples, but the current collection system cannot realize the collection of large-scale test samples;

[0007] 2. When collecting LED luminous flux, it will be affected by the brightness of adjacent LEDs, resulting in inaccurate feature quantity collection;

[0008] 3. There are great difficulties in the automatic realization of direct collection of luminous flux. Summary of the invention

[0009] The technical problem solved by the present invention is to provide an automatic acquisition system for characteristic parameters of LED life, so as to solve the problem that the number of test samples is small, thus affecting the accuracy of life evaluation results.

[0010] The technical solution adopted by the present invention to solve the technical problem is: an automatic acquisition system for characteristic parameters of LED life, including an LED life test module, including a disc-type test bench for placing the LED to be tested, a mechanical arm is arranged on the test bench, a photometer is arranged on the mechanical arm, an actuator for driving the mechanical arm to move is also arranged on the mechanical arm, and a light-blocking module with adjustable height is arranged around the photometer;

[0011] The actuator includes a rotary actuator for driving the mechanical arm to rotate, a radial telescopic actuator for driving the mechanical arm to move radially along the disc-type test bench, and an axial telescopic actuator for driving the mechanical arm to move axially along the disc-type test bench;

[0012] It also includes a control module and a data storage and display module. The control module is connected to the actuator, the light meter, and the data storage and display module respectively.

[0013] Furthermore, the disc-type test bench is provided with an origin positioning hole for giving a reset signal to the actuator, an infrared signal transmitter is provided at the origin positioning hole, and the robotic arm is provided with an infrared signal receiver used in conjunction with the infrared signal transmitter, and both the infrared signal transmitter and the infrared signal receiver are connected to the control module.

[0014] Furthermore, the light blocking module is a height-adjustable baffle arranged around the robot arm.

[0015] Furthermore, it also includes a data storage and display module for recording loop test current, time information and detection data of all LED samples and displaying the data according to instructions, and the data storage and display module is connected to the control module.

[0016] Furthermore, the invention also includes a short-circuiting mechanism arranged on the disc-type test bench for short-circuiting a failed LED.

[0017] Furthermore, the rotary actuator is a servo motor coaxial with the disc-type test bench.

[0018] The beneficial effects of the present invention are:

[0019] 1. Use a illuminance meter to measure illumination, and illumination can be converted to luminous flux through a functional relationship, making it easier and more accurate to obtain luminous flux;

[0020] 2. Use a light-blocking module to isolate the LED under test from other LEDs, so that the measurement result of the LED is not interfered by other LEDs;

[0021] 3. Through the radial telescopic actuator and the axial telescopic actuator, the test system can be expanded through reasonable topology to achieve the purpose of expanding the test sample space and make the life assessment results more effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the acquisition system.

[0023] Figure 2 This is a schematic diagram of the module electrical connection of this acquisition system.

[0024] Reference numerals:

[0025] 11-test bench, 110-origin positioning hole, 111-infrared signal transmitter, 12-mechanical arm, 121-infrared signal receiver, 122-rotation actuator, 123-radial telescopic actuator, 124-axial telescopic actuator, 125-light blocking module, 126-illuminance meter, 130-LED sample. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 and Figure 2 The LED life characteristic parameter automatic acquisition system shown includes an LED life test module, which has been clearly described in the previous patents "An LED test automatic control system" and "An LED aging state automatic detection and life evaluation system and method thereof". This application does not make any improvements to it, so it is not repeated here. It includes a disc-type test bench 11 for placing the LED to be tested, a mechanical arm 12 is provided on the test bench 11, a light meter 126 is provided on the mechanical arm 12, and an actuator for driving the mechanical arm 12 to move is also provided on the mechanical arm 12, and a height-adjustable light blocking module 125 is provided around the light meter 126;

[0028] The actuators include a rotary actuator 122 for driving the mechanical arm 12 to rotate, a radial telescopic actuator 123 for driving the mechanical arm 12 to move radially along the disc-type test bench 11, and an axial telescopic actuator 124 for driving the mechanical arm 12 to move axially along the disc-type test bench 11;

[0029] It also includes a control module and a data storage and display module, wherein the control module is connected to the actuator, the light meter 126, and the data storage and display module respectively;

[0030] The light blocking module 125 is a height-adjustable baffle disposed around the robot arm 12, and can also be designed as a baffle cover, etc. The baffle and the baffle cover can be designed to be fixed or retractable, and the retractable light blocking module 125 is controlled by the control module;

[0031] During specific operation, the LED sample 130 group is connected in series and installed at the corresponding position of the disc of the disc test bench 11 in a concentric, equal radius and uniform angle. The control module controls the rotary actuator 122 to rotate at a preset speed or angle. The preset value is pre-set in the control module. When it rotates above the LED sample 130, the control module controls the rotary actuator 122 to stop rotating; at the same time, the axial telescopic actuator 124 is driven to push the detection device to the preset position, and the light meter detects the illuminance of the corresponding LED sample 130; while detecting, the light blocking module 125 can isolate the LED under test from other LEDs, so that the measurement result of the LED is not interfered by other LEDs. After the rotary actuator 122 rotates one circle, the control module controls the radial telescopic actuator 123 to drive the mechanical arm 12 to drive the detection device Move to the position of LED samples 130 with different radii, and continue to detect until all LED samples 130 are measured, that is, a measurement cycle is over, wherein the rotating actuator 122 includes a rotating motor coaxial with the test bench 11, and the rotating motor drives the mechanical arm 12 to rotate; the radial telescopic actuator 123 and the axial telescopic actuator 124 are high-precision motor-driven screws or linear motor-driven linear slides, preferably high-precision motor-driven screw mechanisms; the rotating motor and the telescopic motor are servo motors; this structure can realize simultaneous testing of multiple groups of LED samples of equal number and angle by changing the radius, thereby expanding the test sample space, so that the test system can achieve the purpose of expanding the test sample space through reasonable topological expansion, making the life evaluation result more effective;

[0032] The illumination after the above detection is based on the conversion between illumination and luminous flux. The unit of illumination is lux, that is, 1 lux = 1 lumen of luminous flux evenly distributed on an area of ​​1 square meter. Therefore, the use of the illuminance meter 126 can realize the rapid acquisition of luminous flux, making the acquisition of luminous flux easier and more accurate.

[0033] On the basis of the above, if Figure 1As shown, the disc-type test bench 11 is provided with an origin positioning hole 110 for giving a reset signal to the actuator, and an infrared signal transmitter 111 is provided at the origin positioning hole 110. The mechanical arm 12 is provided with an infrared signal receiver 121 used in conjunction with the infrared signal transmitter 111. The infrared signal transmitter 111 and the infrared signal receiver 121 are both connected to the control module. During specific operation, each time the mechanical arm 12 rotates to the top of the origin positioning hole 110, the infrared signal receiver 121 receives the infrared signal and transmits the infrared signal to the control module, and the control module sends a reset drive signal to reset the rotating actuator 122 to eliminate the accumulated error; similarly, each time the axial telescopic actuator 124 is telescoped, the control module sends a reset drive signal to reset the telescopic actuator to eliminate the accumulated error, which is equivalent to each telescope once - testing one LED sample 130 - retracting and resetting - rotating a certain angle and telescoping once again, and so on; and after one rotation, the rotating actuator 122 is reset once, and this setting can maximize the accuracy of the test.

[0034] On the basis of the above, it also includes a data storage and display module for recording the loop test current, time information and detection data of all LED samples 130 and displaying the data according to instructions. The data storage and display module is connected to the control module. The data storage and display module is used to receive instructions from the control module, automatically record the loop test current, time information and detection data of all LED samples 130, and display the data according to instructions. This structure improves human-computer interaction and speeds up the efficiency of forming test files.

[0035] On the basis of the above, it also includes a short-circuiting mechanism arranged on the disc-type test bench 11 for short-circuiting the failed LED. When the LED is detected to be failed, the control module controls the short-circuiting mechanism to short-circuit the failed LED. The short-circuiting mechanism has a simple structure and only needs to short-circuit the two ends of the failed LED with a conducting wire. It can be an execution unit such as a relay.

[0036] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic acquisition system for LED life characteristic parameters, including an LED life test module, characterized in that: The invention comprises a disc-type test bench (11) for placing an LED to be tested, wherein a mechanical arm (12) is arranged on the test bench (11), a light meter (126) is arranged on the mechanical arm (12), an actuator for driving the mechanical arm (12) to move is also arranged on the mechanical arm (12), and light blocking modules (125) with adjustable height are arranged around the light meter (126); The actuator comprises a rotation actuator (122) for driving the mechanical arm (12) to rotate, a radial telescopic actuator (123) for driving the mechanical arm (12) to move radially along the disc-type test bench (11), and an axial telescopic actuator (124) for driving the mechanical arm (12) to move axially along the disc-type test bench (11); It also includes a control module and a data storage and display module, wherein the control module is connected to the actuator, the light meter (126), and the data storage and display module respectively; The light blocking module (125) is a height-adjustable baffle disposed around the mechanical arm (12); It also includes a data storage and display module for recording loop test current, time information and detection data of all LED samples (130) and displaying the data according to instructions, wherein the data storage and display module is connected to the control module; It also comprises a short-circuiting mechanism which is arranged on the disc-type test bench (11) and is used for short-circuiting a failed LED.

2. The LED life characteristic parameter automatic acquisition system according to claim 1, characterized in that: The disc-type test bench (11) is provided with an origin positioning hole (110) for providing a reset signal to an actuator, an infrared signal transmitter (111) is provided at the origin positioning hole (110), and the mechanical arm (12) is provided with an infrared signal receiver (121) used in conjunction with the infrared signal transmitter (111), and both the infrared signal transmitter (111) and the infrared signal receiver (121) are connected to a control module.

3. The LED life characteristic parameter automatic acquisition system according to claim 1, characterized in that: The rotary actuator (122) is a servo motor coaxial with the disc-type test bench (11).

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