CN201662605U

CN201662605U - LED electrical characteristic detector

Info

Publication number: CN201662605U
Application number: CN 200920199352
Authority: CN
Inventors: 薛凌云; 黄伟
Original assignee: Hangzhou Electronic Science and Technology University
Current assignee: Hangzhou Dianzi University; Hangzhou Electronic Science and Technology University
Priority date: 2009-10-29
Filing date: 2009-10-29
Publication date: 2010-12-01
Anticipated expiration: 2019-10-29

Abstract

The utility model relates to a LED electrical characteristic detector. The prior art can not meet the quick and high precision requirements of online detection. The LED electrical characteristic detector includes a PC machine, a detecting source meter and a tooling clamp which are mutually connected in sequence. The detecting source meter includes a power module and a microprocessor module; the microprocessor module is connected with a D/A conversion module, a high precision constant current/constant voltage source module, and an A/D conversion module in sequence to form closed loop constant current/constant voltage control. The microprocessor module is respectively connected with a data storage module, a clock management module, a keyboard display module and a series communication module. The power module is respectively connected with the other modules to supply power for the other modules. The online detector which has the advantages of high precision, quick speed and low cost, and the intelligent functions of self-maintenance, self-correcting and failure-alarming, etc, not only can be used for the online and offline detection of electrical characteristics of LED chips, but also can be applied to the online and offline detection of electrical characteristics of LED apparatuses.

Description

A kind of LED electrical characteristics detector

Technical field

The utility model belongs to the electric detective technology field, relates to a kind of LED electrical characteristics detector, is mainly used in the online and offline inspection of electrical characteristics of led chip and device.

Background technology

At present, all need adopt plurality of LEDs simultaneously in most LED application scenario, very high to the coherence request of the light of each LEDs, electricity, look parameter.But according to the characteristics of semiconductor technology, for the LED that produces in enormous quantities, it is unpractical requiring every batch product light, electricity, look parameter in full accord.Therefore, the test of LED is a necessary operation in the LED production run with letter sorting, and led chip electrical characteristics detector wherein to be indispensable production equip equipment, its application covers whole LED industrial chain.But in current LED industry, no matter be operation chip manufacturing enterprise before the LED, or the encapsulation enterprise of operation behind the LED, online LED light,, the main dependence on import of look testing apparatus, cost an arm and a leg, thereby domestic most producer does not adopt, and only adopt the method for laboratory sampling observation to test, same batch of LED uniformity in product performance can't guarantee to dispatch from the factory, be difficult to satisfy the rapidity of online detection, requirements for high precision, be difficult to possess from safeguarding, self-correcting, intelligent functions such as fault alarm are difficult to provide production data, all kinds of analytical statements such as product quality statistics.

Summary of the invention

The purpose of this utility model is at LED electrical characteristics online measuring technique present situation, and a kind of LED electrical characteristics detector is provided.

The utility model comprises PC, detection resources table and the frock clamp of order interconnection.

The detection resources table comprises power module, microprocessor module, D/A modular converter, high precision constant current/constant pressure source module, A/D modular converter, output polarity modular converter, data memory module, Clock management module, keyboard display module and serial communication module.Microprocessor module adopts the LPC2214 chip of PHILIP company.

Power module is connected respectively with other modules, is other module for power supply.Microprocessor module and D/A modular converter, high precision constant current/constant pressure source module, A/D modular converter are linked in sequence, and constitute the control of closed loop constant current/constant voltage.Microprocessor module is connected with the output polarity modular converter, realizes the polar switching of output electrode.Microprocessor module is connected with data memory module, Clock management module, keyboard display module respectively, the testing result of the detection time of obtaining current testing conditions by PC or keyboard display module setting, by PC or Clock management module, the tested LED voltage/current that obtains through the sampling of A/D modular converter is saved in data memory module.The interconnection of serial communication module and microprocessor module detects data with the history in current detection result data or the data memory module, uploads to PC, or will pass to microprocessor module under the correlation parameter of PC setting or the order.

LED electrical characteristics detector precision height of the present utility model, speed is fast, price is low and have from intelligent functions such as maintenance, self-correcting, fault alarms, both can be used for the online and offline inspection of led chip electrical characteristics, also can be applicable to the online and offline inspection of LED device electrical characteristics.

Description of drawings

Fig. 1 is the utility model theory structure synoptic diagram;

Fig. 2 is a detection resources table theory structure synoptic diagram among Fig. 1.

Embodiment

As shown in Figure 1, LED electrical characteristics detector comprises PC 1, detection resources table 2 and the frock clamp 3 of order interconnection.PC 1 realizes that setting, production data and the product quality data statistic analysis of coherent detection parameter, analytical statement generate, and possess from intelligent functions such as maintenance, self-correcting, fault alarm, the man-machine close friend of software systems, intuitively easy-to-use.Detection resources table 2 is realized concrete testing process.Frock clamp 3 is realized the detection configuration to different measurands.

As shown in Figure 2, detection resources table 2 comprises power module 2-1, microprocessor module 2-2, D/A modular converter 2-3, high precision constant current/constant pressure source module 2-4, A/D modular converter 2-5, output polarity modular converter 2-6, data memory module 2-7, Clock management module 2-8, keyboard display module 2-9 and serial communication module 2-10.

Power module 2-1 is connected respectively with other modules, is other module for power supply.Microprocessor module 2-2 adopts the LPC2214 chip of PHILIP company, and the work dominant frequency is 11.0592MHz, and operating voltage is+3.3V.Microprocessor module 2-2 and D/A modular converter 2-3, high precision constant current/constant pressure source module 2-4, A/D modular converter 2-5 are linked in sequence, and constitute the control of closed loop constant current/constant voltage.Microprocessor module 2-2 is connected with output polarity modular converter 2-6, realizes the polar switching of output electrode.Microprocessor module 2-2 is connected with data memory module 2-7, Clock management module 2-8, keyboard display module 2-9 respectively, the testing result of the detection time of obtaining the current testing conditions that is provided with by PC 1 or keyboard display module 2-9, by PC 1 or Clock management module 2-8, the tested LED voltage/current that obtains through A/D modular converter 2-5 sampling is saved in data memory module 2-7.Serial communication module 2-10 and microprocessor module 2-2 interconnection, history among current detection result data or the data memory module 2-7 is detected data, upload to PC 1, or passing to microprocessor module 2-2 under correlation parameter that PC 1 is provided with or the order, the baud rate of serial communication module setting is 9600bps～115200bps.

In the present embodiment, the main chip of each module is: D/A modular converter 2-3 adopts MAX545 chip, high precision constant current/constant pressure source module 2-4 to adopt OP77 chip, A/D modular converter 2-5 to adopt LTC1606 chip, output polarity modular converter 2-6 to adopt IR2102 chip, data memory module 2-7 to adopt IS61LV25616 chip, Clock management module 2-8 to adopt PCF8563T chip, keyboard display module 2-9 to adopt HG128642 chip and serial communication module 2-10 to adopt the MAX232 chip.

The principle of work of this LED electrical characteristics detector: connect working power, the detection resources table is finished hardware initialization work, PC issues parameter by serial ports order is set, LED polarity is set to be judged and the electrical parameters detection condition, after the start detection, microprocessor module is finished the polar switching of detecting electrode by the switching bridges of output polarity modular converter, drive high precision constant current/constant pressure source module and provide corresponding continuous current/constant voltage according to the value of setting, start the sample voltage/current signals of tested LED of A/D modular converter, the current detection time that testing result and Clock management module are provided together is saved in data memory module, and shows or be transferred to PC through the serial communication module through LCD and carry out data presentation, analyze and handle.This LED electrical characteristics detector can also be worked under the situation that breaks away from PC, promptly finishes the setting of correlation parameter by keyboard display module.System possesses from intelligent functions such as maintenance, self-correcting, fault alarms.

Claims

1. a LED electrical characteristics detector comprises PC, detection resources table and frock clamp that order interconnects, it is characterized in that:

Described detection resources table comprises power module, microprocessor module, D/A modular converter, high precision constant current/constant pressure source module, A/D modular converter, output polarity modular converter, data memory module, Clock management module, keyboard display module and serial communication module, and wherein microprocessor module adopts the LPC2214 chip of PHILIP company;

Described power module is connected respectively with other modules, is other module for power supply; Microprocessor module and D/A modular converter, high precision constant current/constant pressure source module, A/D modular converter are linked in sequence, and constitute the control of closed loop constant current/constant voltage; Microprocessor module is connected with the output polarity modular converter, realizes the polar switching of output electrode; Microprocessor module is connected with data memory module, Clock management module, keyboard display module respectively; Serial communication module and microprocessor module interconnection.