A 198-ns/V VO-hopping reconfigurable RGB LED driver with automatic ΔVO detection and quasi-constant-frequency predictive peak current control

2012 ◽  
Author(s):  
Yi Zhang ◽  
Hai Chen ◽  
Dongsheng Ma
Keyword(s):  
Current Control ◽  
Led Driver ◽  
Constant Frequency ◽  
Peak Current

Peak Current Control of Multichannel LED Driver With Selective Dimming

2019 ◽  
Vol 66 (5) ◽  
pp. 3446-3457 ◽  
Author(s):  
Cikai Ye ◽  
Pritam Das ◽  
Sanjib Kumar Sahoo
Keyword(s):  
Current Control ◽  
Led Driver ◽  
Peak Current

scholarly journals A simplified controller and detailed dynamics of constant off-time peak current control

2017 ◽  
Vol 68 (5) ◽  
pp. 390-395
Author(s):  
Alex Van den Bossche ◽  
Ekaterina Dimitrova ◽  
Vencislav Valchev ◽  
Firgan Feradov
Keyword(s):  
Current Control ◽  
Duty Ratio ◽  
Digital Controllers ◽  
Constant Frequency ◽  
Peak Current ◽  
Time Dynamics ◽  
Temperature Range ◽  
Wide Range ◽  
Off Time ◽  
A Current

Abstract A fast and reliable current control is often the base of power electronic converters. The traditional constant frequency peak control is unstable above 50 % duty ratio. In contrast, the constant off-time peak current control (COTCC) is unconditionally stable and fast, so it is worth analyzing it. Another feature of the COTCC is that one can combine a current control together with a current protection. The time dynamics show a zero-transient response, even when the inductor changes in a wide range. It can also be modeled as a special transfer function for all frequencies. The article shows also that it can be implemented in a simple analog circuit using a wide temperature range IC, such as the LM2903, which is compatible with PV conversion and automotive temperature range. Experiments are done using a 3 kW step-up converter. A drawback is still that the principle does not easily fit in usual digital controllers up to now.

Analysis and Modeling of Nonlinear Effects in Constant-Frequency Peak-Current Control

2021 ◽  
Vol 31 (15) ◽  
Author(s):  
Marija Glišić ◽  
Predrag Pejović
Keyword(s):  
Nonlinear Effects ◽  
Higher Order ◽  
Current Control ◽  
Model Parameters ◽  
Output Current ◽  
Signal Model ◽  
Constant Frequency ◽  
Peak Current ◽  
Frequency Peak ◽  
Numerical Approaches

In this paper, constant-frequency peak-current control is analyzed focusing on the operation above the subharmonic threshold limit. The analysis is performed by mixing analytical and numerical approaches. Two levels of normalization are introduced: on the converter level and on the switching cell level, resulting in unified analysis regardless of the converter type. A function that maps the inductor current value at the beginning of a switching period to its value at the end of the switching period is derived. The analysis is performed by iterating this mapping, leading to information of the inductor current periodicity and the switching cell averaged output current. It is shown that before reaching chaotic state a converter passes through a sequence of bifurcations involving discontinuous conduction modes characterized by higher order periodicity. Boundaries of the region where the higher order discontinuous conduction modes occur are derived. Obtained dependence of the switching cell output current average on the operating parameters is used to derive a small signal model. The model parameters expose huge variations in the areas of deep subharmonic operation. The results are experimentally verified.

Peak Current Control-Based Power Ripple Decoupling of AC–DC Multichannel LED Driver

2019 ◽  
Vol 66 (12) ◽  
pp. 9248-9259 ◽  
Author(s):  
Cikai Ye ◽  
Pritam Das ◽  
Sanjib Kumar Sahoo
Keyword(s):  
Current Control ◽  
Led Driver ◽  
Peak Current

Current control and PWM dimming in an automotive LED driver based on a Ćuk converter

2017 ◽  
Author(s):  
Alihossein Sepahvand ◽  
Ashish Kumar ◽  
Montu Doshi ◽  
Vahid Yousefzadeh ◽  
James Patterson ◽  
...  
Keyword(s):  
Current Control ◽  
Led Driver ◽  
Cuk Converter ◽  
Pwm Dimming
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