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This paper presents the optimal design of the light-emitting diode (LED) array combinations for three typical nonisolated continuous-conduction mode single-loop control LED drivers. Based on the LED Taylor series model and the equivalent circuits of these three LED drivers, the quality factor functions in their transfer functions of the control-to-output current are derived to predict the optimal...
This paper presents the optimal light-emitting-diode (LED) array combination for the single-loop continuous-conduction mode (CCM) boost driver. The Taylor series for describing the characteristics of the LED is used to characterize the relationship between the forward voltage and current of LEDs. Moreover, in order to predict the system performance, including system stability and maximum-efficiency...
This paper presents the optimal light-emitting-diode (LED) array combination for the peak current mode discontinuous-conduction-mode (DCM) boost driver, based on the efficiency consideration. The design guideline to specify the conduction mode for the operation of the employed boost driver corresponding to the combinations of an N×M LED array is proposed. The prototype circuit is built to compare...
This paper presents the optimal light-emitting-diode (LED) array combination for dual-loop continuous-conduction mode (CCM) boost driver. In order to more precisely characterize the non-linear V-I curve of LEDs, the LED model with Taylor series expression is constructed. Moreover, the system transfer functions are derived by equivalent circuit of the boost driver to predict the system performance,...
This paper presents the Taylor series expression based equivalent circuit models of light emitting diodes (LEDs) for the analysis of the LED driver system. In order to describe the non-linear V-I characteristics of LEDs, Taylor series can be used to express the equivalent conductance components in the DC and AC equivalent circuit models of LEDs. Based on the Taylor series expression, the equivalent...
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