Current energy-saving lamps on the market a range of technologically advanced and more environmentally-friendly energy-saving lamps LED comes. According to statistics, LED energy-saving lamps save 80% energy compared to incandescent lamps and 50% less energy than fluorescent energy-saving lamps. With the development of high-power LED driving technology, LED lamps are increasingly becoming the main lighting system in the future, and the range of applications covers mobile phone backlights, notebook backlights, LCD TVs, street lamps, garden lights and other fields. Also, because the application requires more stringent LED lighting quality, the LED light source needs to be tested for luminous efficiency, color rendering and color temperature consistency before delivery, and provides data-based test reports.
introduction
As the familiar backlight of the laptop is a combination of a large number of LED lights, the problem of chromatic aberration is becoming more and more obvious. If the LED lamp beads used are not in the same batch, it is easy to cause problems such as different wavelengths and chromatic aberrations. This problem is inevitable even if the same batch of LED lamp beads are used. For the testing of LED chips , the integrating sphere testing system is generally used.
Using the integrating sphere to measure parameters such as luminous flux, the measurement results can be more reliable. The integrating sphere reduces and removes errors caused by differences in light shape, divergence angle, and the like. Such high-precision and prudent measurement also drives LED integrating sphere manufacturers to increasingly choose higher performance power supplies in the system to power the LEDs to be tested.
LED integrating sphere test system
The LED integrating sphere is mainly used to measure the luminous efficiency, color rendering and chromatic aberration of the LED lamp, and the parameters that characterize the performance of the LED light source. In the large-volume test of the production line every day, there are two problems at present: one is how to improve the test efficiency and the other is how to better protect the LED to be tested in the measurement.
It is understood that in the current power industry, from the power supply to the LED lamp power supply to the software control system to collect back a stable voltage and current value, the total time is about 600ms, then on this basis, is there a possibility of breakthrough? The answer is yes. So what can be achieved? In fact, the power supply configured in the system to supply power to the LED to be tested plays a very important role.
LED integration ball test system schematic
1. Configure professional power supply to suppress overshoot and improve test efficiency
In the normal power supply, due to the loop response time, the power output does not reach the set output voltage value and stops outputting. Therefore, during this time, the voltage will overshoot. Excessive overshoot voltage can affect the life of the LED, and even severely break down the LED.
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