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Please use this identifier to cite or link to this item: http://hdl.handle.net/10651/10433

Title: A very simple control strategy for power factor correctors driving high-brightness LEDs
Author(s): González Lamar, Diego
Sebastián Zúñiga, Francisco Javier
Rodríguez Alonso, Alberto
Rodríguez González, Miguel
Hernando Álvarez, Marta María
Issue date: 2009
Publisher version: http://dx.doi.org/10.1109/TPEL.2009.2020900
Citation: IEEE Transactions on Power Electronics, 24(8), p. 2032-2042 (2009); doi:10.1109/TPEL.2009.2020900
Format extent: p. 2032-2042
Abstract: This paper presents a new control strategy for power factor correctors (PFCs) that are used to drive high-brightness LEDs. This control strategy is extremely simple and is based on the use of a conventional peak-current-mode controller with a suitable selection of the compensation ramp waveform. Neither an analog multiplier nor an input voltage sensor is needed to achieve quasi-sinusoidal line waveforms at nominal conditions and full load. If the converter belongs to the flyback family (flyback, buck-boost, SEPIC, Cuk and Zeta), the line waveform appears notably distorted if the compensation function is a linear ramp, but becomes almost sinusoidal if the linear ramp is substituted by a properly chosen exponential function. The line waveform is slightly distorted when the load varies or when the converter works under either overvoltage or undervoltage conditions. However, the waveform maintains a very high power factor (PF) even under these conditions. Moreover, the line current is cycle-by-cycle-controlled due to the peak-current-mode control, and hence, the input-current feedback loop is extremely fast, thereby allowing this type of control to be used with high-frequency lines (above 400 Hz)
URI: http://hdl.handle.net/10651/10433
ISSN: 0885-8993
Local identifier: 20090325
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