Unified Small-Signal Model and Compensator Design of Flyback Converter With Peak-Current Control at Variable Frequency for USB Power Delivery

2019 ◽  
Vol 34 (1) ◽  
pp. 783-793 ◽  
Author(s):  
Ching-Jan Chen ◽  
Ching-Hsiang Cheng ◽  
Ping-Sheng Wu ◽  
Shinn-Shyong Wang
Keyword(s):  
Current Control ◽  
Power Delivery ◽  
Variable Frequency ◽  
Small Signal ◽  
Signal Model ◽  
Peak Current ◽  
Flyback Converter ◽  
Small Signal Model ◽  
Compensator Design

scholarly journals Small-Signal Model for Dual Active Bridge Series Resonant DC-DC Converters with Variable-Frequency and Phase-Shift Modulation

2019 ◽  
Vol 37 (4) ◽  
pp. 830-837
Author(s):  
Weijian Han ◽  
Ruiqing Ma ◽  
Qing Liu
Keyword(s):  
Phase Shift ◽  
Closed Loop ◽  
Variable Frequency ◽  
Stable Operation ◽  
Small Signal ◽  
State Variables ◽  
Signal Model ◽  
Dual Active Bridge ◽  
Small Signal Model ◽  
Series Resonant

Variable frequency and phase shift modulation can achieve zero-voltage switching (ZVS) of dual active bridge series resonant DC-DC converters(DABSRCs) over a wide operating range so as to effectively improving system efficiency and reliability. In order to study the dynamics of DABSRCs and provide the basis for the closed-loop compensator design, a continuous-time small-signal model is proposed. The generalized average modelling approach is adopted, in which the DC component of the output voltage and the fundamental component of the inductor current and resonant capacitor voltage are selected as the state variables, precisely describing impacts of the resonance on the system dynamics. On the above-mentioned basis, a closed-loop compensator is designed, which achieves the stable operation with the ZVS variable frequency and phase shift modulation. The analysis results are verified by the simulation and experimental results.

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