Throughout 2011, in the shadow of the financial crisis, with the European debt crisis, the US and other countries' credit ratings being downgraded, and emerging markets aging, the international environment faces new uncertainties and complexities. At the same time, the state puts the price hikes at the top of economic work. Under this request, a series of measures such as raising the deposit reserve ratio, raising interest rates, housing purchases, and appreciation of the renminbi have come one after another. Many SMEs are facing capital and market shrinkage. The pressure of product destocking. As an emerging industry, the LED lighting industry lighting lighting project is affected by the global environment and its industry specificity.
The LED lamp power is precisely the most important development of the LED current, relevant for the design of LED technology, there are already a variety of programs and unique design approach, we look one by one;
1. Why should LED street light power supply be constant?
The characteristics of LED lighting materials determine that they are greatly affected by the environment. For example, if the temperature changes, the current of the LED will increase, and the voltage will increase, and the current of the LED will also increase. Long-term operation beyond the rated current will greatly shorten the life of the LED lamp. The LED constant current is to ensure that the operating current value does not change when environmental factors such as temperature and voltage change.
2, LED street light power supply constant current accuracy
The constant current accuracy of some power sources on the market is poor, and the constant current scheme such as the popular recommended scheme on the market has an error of ±8% and the constant current error is too large. The general requirement is ±3%. According to the 3% design. The production power supply should be fine-tuned to achieve ±3% error.
3, LED street light power supply operating voltage
The recommended operating voltage of general LED is 3.0-3.5V. After testing, most of the work is at 3.2V, so it is reasonable to calculate according to 3.2V. Total voltage of N lamp beads in series = 3.2* N
4, LED street light power supply is the most suitable working current
For example, the rated working current of LED is 350 mAh. Some factories use it at the beginning and design 350 mA. In fact, the working heat is very serious at this current. After many comparison tests, it is ideal to design 320 mA. . Minimize heat and turn more electrical energy into visible light.
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