Solve the problem of flashing high-voltage linear scheme of LED lamp without affecting PF and THD

The traditional drivers used in most LED lighting products incorporate LED and Switching Power Supply (SMPS) technology, and while switching power supply drivers are proven, they do not provide the benefits of LED Light Drivers using the updated Direct Current Drive (DACD) technology.

Despite the advantages of lower cost, smaller form factor, higher performance, longer system life is still a concern, and DACD technology is slow in this area, especially in the commercial and industrial segments.

The main reason that lighting manufacturers have not fully embraced DACD technology is that it has inherent flicker problems that can occur when the LED is turned off briefly. When the AC line crosses zero, the LED turns off or flashes.

Although the flicker problem is not always obvious, it still plagues a small group of people who have been exposed to flashing lights for a long time. This is a major problem facing offices, schools, shops and other brightly lit commercial and industrial spaces where people stay for a long time.

Although there is currently no official standard for controlling flicker, most manufacturers and customers accept the US Energy Star recommended specification for calculating the scintillation index, which is preferably 0.15 or lower. All, below 0.15, will be perceived as undetectable, and lighting manufacturers will naturally strive to achieve or exceed this goal.

In addition to requiring the lamp to have an acceptable flicker index, the customer typically performs a simple test to ensure that the lamp is working properly. They use a smartphone to take pictures of the lights, and if there are black lines in the image, the flashing is too high, so they won't accept it.

High scintillation index (left) and low scintillation index (right)

To eliminate flicker, a significant solution is to keep the LEDs on when the power is off, which seems to be an easy remedy, but there are actually problems. So far, other DACD vendors have used traditional methods to keep the accumulators on. Although this solves the flicker problem, it can also cause distortion of the input line current waveform, which affects power factor (PF) and total harmonic distortion (THD) performance.

This is a particular issue for industrial and commercial lighting products and must meet widely accepted PF and THD performance guidelines or the customer will refuse to accept it. To comply with this specification, PF must be 0.9 or higher, and THD usually needs less than 20%.

Fortunately for manufacturers, Fairchild solved these problems with a new family of DACD solutions that not only eliminate flicker, but also maintain high PF and low THD. The new DACD solution is implemented using our patented solution, which not only provides the current needed to keep the LEDs on, but also keeps the input current sinusoidal, so there is no distortion that affects PF and THD performance.

Manufacturers can take advantage of the new family of DACD solutions to develop new LED lighting products based on DACD technology to achieve higher margins in the more profitable commercial and industrial lighting markets.

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