The topic of hot LED lighting has been extended from the beginning of the year to the end of the year. Everyone knows that LEDs have long energy-saving and environmental protection life, but in the face of large-scale applications, they have to delay the time to market due to problems such as mismatched power supply life and insufficient reliability. More and more people in the industry realize that to fully utilize the potential of LEDs, lighting drive power is one of the key supporting factors.
For LED lighting drive power, the current main demands are focused on high reliability and high efficiency. Xing Xianfeng, general manager of Xi'an Mingtai Semiconductor Technology Co., Ltd. from the local area, clearly put forward three requirements for the current LED lighting driver power supply:
First, it must have high reliability, including long life matched with LED light source, wide working temperature adaptability (-40 degrees - 65 degrees, even -55-85 degrees), and wide grid adaptation and self-protection. Performance, etc.
Second, to be energy efficient, Mingtai Tesemi's product efficiency is as high as 95%, far exceeding the first-class energy efficiency standards of 91% in China and the EU;
Third, in the current LED products without comprehensive standards, LEDs must meet the electrical mandatory standards, especially EMC's GB17743 corresponds to IEC6100, and current harmonic THD's GB17625.1-2003 corresponds to IEC61000-3-2:2001, which requires The power supply must have good EMC, PFC/THD.
iWatt has been working with a number of LED lighting companies to provide power solutions. The company's vice president of sales, Zhu Baozhen, said that the trend of LED lighting power development should be: high efficiency, high reliability, and compatibility with a wide range of applications for dimming and non-dimming. Doug Bailey, vice president of marketing at PowerIntegrations, also believes that all customers need reliable, energy-efficient LED driver products.
Of course, there are other requirements, such as power factor correction (PFC), flicker-free thyristor dimming, high-precision constant-current drive output between different input voltages, temperatures, and bulbs, as well as consistent turn-on and turn-off. Break performance. According to Doug Bailey, PowerIntegrations (PI) devices offer these features in both isolated (LinkSwitch-PH) and non-isolated (LinkSwitch-PL) topologies, depending on the mechanical isolation method chosen and the target application. Security rules.
The current market demand for LED lighting power varies from application to application. The design requirements for consumer light bulbs are quite different from those of street lighting or industrial fluorescent replacement lamps. According to Rohm, the bulb type used for indoor lighting in the LED lighting market has gradually transitioned to a straight tube type, and street lights for outdoor use have also increased. As LEDs have improved in brightness, LED driver circuits have gradually begun to develop toward higher output.
Offline LED lighting power supply into the mainstream
At present, the development of LED replacement bulbs and other new LED lighting is very rapid, and the main market tends to be offline LED lighting power. Peter B. Green, head of the International Rectifier (IR) LED division, pointed out that the offline LED power supply market is mainly divided into high power and low power, which is about 50W, excluding low voltage applications such as handheld devices .
Lamp replacements based on integrated LEDs mostly use a simple, non-isolated buck regulator LED driver circuit. These products use the fewest component count and lowest cost, but must also provide enough lumens per watt, and a power factor higher than 0.7, with standard triac dimmer dimming ability.
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