OFweek Semiconductor Lighting Network: For high temperature, high reliability industrial applications that are not concerned about dimming, it is strongly recommended not to use electrolytic capacitors for design; in most cases it is best to use single-stage design; the main face of Chinese manufacturers The challenge will be how to optimize quality costs.
For applications that do not require dimming, the use of LinkSwitch-PH eliminates the need for electrolytic capacitors. Our single-stage PFC/constant current design allows designers to eliminate bulk capacitors—usually between traditional PFC and constant current stages. The only remaining requirement for the capacitor is to power the LED through the low point of the AC waveform (at this point, the voltage is close to zero) in the output. Ceramic capacitors, tantalum capacitors or OSCON capacitors of sufficient capacity can be used instead of electrolytic capacitors to eliminate 100Hz or 120Hz flicker. For high temperature, high reliability industrial applications that are less concerned with dimming, I strongly recommend not using electrolytic capacitors for design.
The market demand for LED lighting power varies by application. For example, the design requirements for consumer light bulbs are quite different from streetlights or industrial fluorescent replacement lamps. But in general, all customers need reliable, energy-efficient LED driver products. Other requirements include power factor correction (PFC), flicker-free thyristor dimming, high-precision constant-current drive output across different input voltages, temperatures, and bulbs, as well as consistent turn-on and turn-off performance. Power Integrations (PI) devices have these features in both LinkSwitch-PH (isolated) and LinkSwitch-PL (non-isolated) topologies, depending on the mechanical isolation method chosen and the security of the target application. rule.
The two-stage architecture is suitable for legacy drivers that must use a second constant current drive circuit to allow the PFC to drive the LEDs at constant current. These designs are outdated and no longer cost effective, so in most cases it is best to use a single stage design.
The physical design determines whether the drive is isolated or non-isolated. Security rules usually require the use of two separate isolation layers. Designers can choose between two physical barriers—a plastic diffuser and a glass shield—and use a non-isolated power supply. Or, if physical isolation costs are too high, there are mechanical difficulties, or too much light is absorbed, electrical isolation issues must be addressed in the power supply. Isolated power supplies are typically larger than non-isolated power supplies of the same power level. Lighting designers must perform significant cost and design optimizations in each of the products they design.
In my opinion, the main challenge facing Chinese manufacturers will be how to optimize the quality cost, which is one of the basic requirements of LED lights. Today, a large number of small companies have entered the LED lighting business, and the market price has been declining due to competition. The use of high-quality, high-reliability power supplies in systems where space is limited and where heat dissipation is difficult (such as LED luminaires) will no longer be free; however, before the end user has used many of the bulbs that last for about 10,000 hours, It is quite difficult to prove that its quality is high. If you rely on a drive controller company that is well-known for producing high-quality power products for harsh environments such as household appliances and electricity meters, things are much simpler. Each of PI's IC products uses high quality design techniques and manufacturing techniques.
PI offers a full range of LED driver products that meet all combinations of PFC, dimming, isolation and non-isolation. What we are most optimistic about is our new LinkSwitch-PH and LinkSwitch-PL devices, which all feature a single-stage design that integrates dimming and PFC functions in a single chip. This makes them more efficient, more cost effective, and more compact.
Author: Vice President of Marketing Integrations Power Doug Bailey
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