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LED instantaneous light flux test method and apparatus in PWM activation technology

A test method and luminous flux technology, applied in the field of measurement, can solve the problems of inconvenient research work, inability to meet the needs of LED instantaneous luminous flux measurement, lack of test methods and test tools, etc., to achieve the effect of dynamic measurement

Inactive Publication Date: 2009-05-13
SHANGHAI RES CENT OF ENG & TECH FOR SOLID STATE LIGHTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] In summary, the existing specifications or regulations cannot meet the measurement requirements of LED instantaneous luminous flux under PWM driving mode, and the lack of relevant test methods and test tools brings great inconvenience to the research work.

Method used

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  • LED instantaneous light flux test method and apparatus in PWM activation technology
  • LED instantaneous light flux test method and apparatus in PWM activation technology
  • LED instantaneous light flux test method and apparatus in PWM activation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0152] Using PMS-50 (enhanced) ultraviolet-visible-near-infrared spectral analysis system of Hangzhou Yuanfang Optoelectronics Information Co., Ltd. + 0.3m integrating sphere, the test is carried out according to the industry standard SJ2355.6-1983 "Integrating sphere measurement luminous flux calibration method". The specific process is as follows:

[0153] In preparation, press the figure 1 , figure 2 The connection relationship between the method and the device is set. In the experiment, a high-power white LED chip is selected, and a constant current is passed through it. The current is increased from 20mA to 400mA, and the relationship curve between the photocurrent of the photoelectric sensor and the luminous flux is obtained, as shown in Figure 8 shown.

[0154] It can be seen from the figure that within the linear range of the optical / electrical sensor, the photocurrent output of the optical / electrical sensor is proportional to the luminous flux, which is consisten...

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Abstract

The invention discloses a test method of instantaneous luminous flux of an LED based on a PWM drive technology and a device thereof, and belongs to the measurement field. The method comprises the following steps: measuring the luminous flux of the LED to be tested by an integrating sphere method, providing an acquisition system which consists of a signal acquisition part, a signal conversion part and a data processing part in addition to a conventional spectral analysis system and a conventional spectral analysis device, measuring the instantaneous luminous flux of the LED to be tested under the PWM pulse drive, and multiplying the duty ratio of a PWM pulse signal with the instantaneous luminous flux to obtain the average luminous flux of the LED to be tested under the PWM pulse drive. The method is based on the existing test equipment, does not deviate from the traditional test methods, does not cause new near-field absorption, can respond to instantaneous peak signals of the pulse drive, helps measure the instantaneous luminous flux of the LED under heat equilibrium condition, and can help realize the dynamic measurement when the pulse drive power changes. The method and the device can be widely used in the fields of performance tests and the calibration of various LEDs and / or PWM pulse drive devices.

Description

technical field [0001] The invention belongs to the field of measurement, in particular to a method for testing the luminous intensity of a light source and a device thereof. Background technique [0002] LED (Light Emitting Diode, Light Emitting Diode) is a new light source device. In recent years, its chip structure, packaging form, driving mode and application fields have undergone earth-shaking changes. The research of LED is in the ascendant, and its research focuses on improving the luminous intensity, luminous frequency (chromaticity), luminous purity (spectrum) and luminous efficiency of LED light sources. [0003] The improvement or improvement of the above indicators (especially the indicators of optical performance) has a lot to do with the structure, material (or composition) of the light-emitting device itself, and the source of the LED's luminous energy-the drive circuit. [0004] (Also known as the driving mode) also has an extremely close relationship. [0...

Claims

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Application Information

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IPC IPC(8): G01J1/00G01J1/42G01M11/02G01R31/44H05B37/02F21V23/00F21Y101/02F21Y115/10
CPCG01J1/42G01J2001/4252
Inventor 钱雯磊王峰李抒智杨卫桥王康平马可军李筠
Owner SHANGHAI RES CENT OF ENG & TECH FOR SOLID STATE LIGHTING
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