Stability Analysis for Peak Current-Mode Controlled Buck LED Driver Based on Discrete-Time Modeling

2018 ◽  
Vol 6 (3) ◽  
pp. 1567-1580 ◽  
Author(s):  
Mingrui Leng ◽  
Guohua Zhou ◽  
Shuhan Zhou ◽  
Kaitun Zhang ◽  
Shungang Xu
Keyword(s):  
Stability Analysis ◽  
Discrete Time ◽  
Current Mode ◽  
Led Driver ◽  
Peak Current ◽  
Time Modeling ◽  
Discrete Time Modeling

scholarly journals Discrete-Time Modeling of High Power Asymmetric Half-Bridge LED Constant-Current Driver Controlled by Digital Current Mode

2020 ◽  
Author(s):  
Zhiyong Qiao ◽  
Shunli Wang ◽  
RongHai Wang ◽  
Yile Shi ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Discrete Time ◽  
High Power ◽  
High Frequency ◽  
Current Mode ◽  
Constant Current ◽  
Time Model ◽  
Sampling Effect ◽  
Discrete Time Model ◽  
Time Modeling ◽  
Discrete Time Modeling

The high-power Asymmetric half-bridge Converter (AHBC) LED constant current driver controlled by digital current mode is a fourth-order system. Static operating point, parasitic resistance, load characteristics, sampling effect, modulation mode and loop delay will have great influence on its dynamic performance. In this paper, the small-signal pulse transfer function of the driver is established by the discrete-time modeling method for the two operating points corresponding to the three modulation modes of the trailing edge, leading edge and double edge. And, the effects of parasitic parameters, delay effect, sampling effect and load effect are fully considered in modeling. For a large number of complex exponential matrix operations, the first order Taylor formula is used for approximate calculation after the coefficient matrix is obtained by substituting the data. Then, Matlab software is used to compare and analyze the discrete-time model and the discrete-average model. The results show that the proposed discrete-time model can more accurately characterize the resonant peak and high-frequency dynamic characteristics, and is very suitable for the design of high frequency digital controller.

Asymptotic Stability Analysis of the Limit Cycle of a Cascaded DC–DC Converter Using Sampled Discrete-Time Modeling

2016 ◽  
Vol 63 (4) ◽  
pp. 2477-2487 ◽  
Author(s):  
Louis-Marie Saublet ◽  
Roghayeh Gavagsaz-Ghoachani ◽  
Jean-Philippe Martin ◽  
Babak Nahid-Mobarakeh ◽  
Serge Pierfederici
Keyword(s):  
Stability Analysis ◽  
Asymptotic Stability ◽  
Limit Cycle ◽  
Discrete Time ◽  
Time Modeling ◽  
Discrete Time Modeling
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