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Lighting flicker, a rapid and repeated change over time in the brightness of light, has long been known to cause illness in humans that ranges from headaches to seizures. Thus, [1] has specified the dimming frequency, fDIM, larger than 3kHz to achieve a no-observable-effect flicker level. State-of-the-art LED drivers employ the SIMO topology with four channels in Fig. 12.7.1, to deliver energy to...
The non-isolated buck topology for LED driver is proposed to reduce volume and cost without the need of large transformer. Besides, in the entire universal range of AC input voltage, the proposed self-adjusted feed-forward control (SAFFC) technique ensures small variation in the LED current. The auto-tracking off-time control (ATOTC) technique is also adopted to adjust the off time to guarantee the...
· It is conventionally believed that the formation of patent pool and technology standard mitigates the problem of patent thickets, and therefore reduces patent disputes among industrial players. Our empirical analysis of the ongoing patent dispute landscape of the LED industry seems to suggest otherwise. The formation of patent pool (e.g., LED licensing program) and standard (e.g., LED consortium)...
LED lighting system with the proposed pseudo-sine-current (PSC) controller removes most of the external passive components, which include inductor, electrolytic capacitor (E-cap), freewheel diode, blocking diode, and the bleeding circuit for Triac dimming control, for low cost and small volume. Besides, 1.1W and 2.2W power loss are reduced in Triac dimming control to get high efficiency of 85% at...
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