Considering that the next two years will be a crucial period for the LED lighting market, companies are also making some technical reserves and options, waiting for the market to fully invest. Among them, the intelligent dimming of LED lamps, especially in commercial lighting applications, is expected to increase rapidly.
â€œIn LED lighting applications, the challenges of dimming technology are very large.â€ Lance Zheng, director of technology marketing for green technology products at Marvell, said that the main challenge is that the price of LED light sources is declining, but the driving electronics technology is not very big. Innovation, prices have been high, and there is pressure on costs. Secondly, since the LED lighting adopts the current driving mode, and the existing dimmers are mostly voltage dimming, the compatibility challenge is also quite large. In addition, the trend of thinning the power supply also requires a smaller size of the LED driver. As a consumer, LED lighting products need to provide consumers with a unique sensory experience with driver IC dimming technology.
In response to the challenges posed by these markets, Marvell is a leading global provider of storage, communications and consumer electronics solutions with long-term research and development in innovative LED driver electronics. Lance Zheng revealed that the company has developed an innovative mixed-signal LED driver architecture that provides high efficiency, high power factor and low harmonics for LED lighting applications, while advanced dimming technology ensures deep dimming and existing lighting architecture. compatibility. In addition, the high integration of integrated circuits (ICs) reduces bill of materials and allows for the use of compact printed circuit boards (PCBs).
In addition, the Marvell solution for the retrofit bulb family market is based on the 88EM8183 (Deep Dimming Single Stage AC/DC Constant Current Controller) designed for off-line dimmable LED lighting applications. With Marvell's new mixed-signal architecture and signal processing technology, the 88EM8138 achieves a minimum of 1% depth dimming and is highly compatible with a wide range of TRIAC dimmers.
The 88EM8183 uses a unique primary-side current control mechanism to achieve its rigorous output current rectification over a wide range of AC input. During this period, quasi-resonant control, valley switching method and power coefficient correction function can be used to achieve high efficiency, high power coefficient, low harmonic distortion and low electromagnetic interference.
At the same time, the 88EM8183 can significantly reduce the number of external components of dimmable LED drivers. The primary-side control topology eliminates the need for optocouplers and any other associated secondary feedback circuitry to improve system stability. Embedded digital cores and analog circuitry effectively manage dimmer load requirements while eliminating the need to use external bleeder circuitry. In addition, the 88EM8183 integrates a high-voltage startup power supply circuit, eliminating the need for an external startup circuit.
"The significant reduction in the number of components and the extremely high compatibility make Marvell's LED driver 20%-40% lower than its competitors." Lance Zheng said that Marvell will have 88EM8183, 88EM8801, 88MZ100. Upgrade the product launch.
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