© The Institution of Engineering and Technology
A floating-voltage DC source is proposed for simple AC–DC conversion. A conventional V GS-multiplier circuit is modified with an additional control current signal in order to achieve variable output voltage. By modulating this control signal, the output voltage can track the input one so that the difference between the input and output voltages can be maintained to be constant with respect to varying the rectified input voltage. The proposed circuit is easily adopted for driving a light-emitting diode (LED) string, which provides a cost-effective solution for LED lighting applications.
References
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3. Cha, S., et al: ‘AC/DC converter free LED driver for lightings’. IEEE Int. Conf. Consumer Electronics, Las Vegas, NV, USA, January 2012, pp. 706–708.
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1. Tsao, J.Y.: ‘Solid-state lighting lamps, chips and materials for tomorrow’, IEEE Circuits Devices Mag., 2004, 20, (3), pp. 28–87 (doi: 10.1109/MCD.2004.1304539).
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2. NXP: ‘SMPS IC for Dimmable LED Lighting’ (SSL2101 Product Data Sheet, 2009).
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4. Kim, J., et al: ‘A soft self-commutating method using minimum control circuitry for multiple-string LED drivers’. IEEE Int. Solid-State Circuit Conf., San Francisco, CA, USA, February 2013, pp. 376–377.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.1290
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