scholarly journals Sliding-Mode Control of a Dc/Dc Postfilter for Ripple Reduction and Efficiency Improvement in POL Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
S. I. Serna-Garcés ◽  
R. E. Jiménez ◽  
C. A. Ramos-Paja
Keyword(s):  
Sliding Mode ◽  
Buck Converter ◽  
Sliding Mode Controller ◽  
Buck Converters ◽  
Efficiency Improvement ◽  
Load Current ◽  
Correct Operation ◽  
Current Harmonics ◽  
Ripple Reduction ◽  
Classical Point

This paper proposes an active postfilter based on two Buck converters, connected in parallel, operating in complementary interleaving. In such a configuration the ripple in the load current could be virtually eliminated to improve the power quality in comparison with classical Point-Of-Load (POL) regulators based on a single Buck converter. The postfilter is designed to isolate the load from the main Buck regulator, leading to the proposed three-converter structure named BuckPS. The correct operation of the postfilter is ensured by means of a sliding-mode controller. Finally, the proposed solution significantly reduces the current harmonics injected into the load, and at the same time, it improves the overall electrical efficiency. Such characteristics are demonstrated by means of analytical results and illustrated using numerical results.

scholarly journals LCC-S Based Discrete Fast Terminal Sliding Mode Controller for Efficient Charging through Wireless Power Transfer

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1370
Author(s):  
Naghmash Ali ◽  
Zhizhen Liu ◽  
Yanjin Hou ◽  
Hammad Armghan ◽  
Xiaozhao Wei ◽  
...  
Keyword(s):  
Sliding Mode ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Sliding Mode Controller ◽  
Wireless Power ◽  
Output Current ◽  
Terminal Sliding Mode ◽  
Charging System ◽  
Fast Terminal Sliding Mode ◽  
System Output

Compared to the plug-in charging system, Wireless power transfer (WPT) is simpler, reliable, and user-friendly. Resonant inductive coupling based WPT is the technology that promises to replace the plug-in charging system. It is desired that the WPT system should provide regulated current and power with high efficiency. Due to the instability in the connected load, the system output current, power, and efficiency vary. To solve this issue, a buck converter is implemented on the secondary side of the WPT system, which adjusts its internal resistance by altering its duty cycle. To control the duty cycle of the buck converter, a discrete fast terminal sliding mode controller is proposed to regulate the system output current and power with optimal efficiency. The proposed WPT system uses the LCC-S compensation topology to ensure a constant output voltage at the input of the buck converter. The LCC-S topology is analyzed using the two-port network theory, and governing equations are derived to achieve the maximum efficiency point. Based on the analysis, the proposed controller is used to track the maximum efficiency point by tracking an optimal power point. An ultra-capacitor is connected as the system load, and based on its charging characteristics, an optimal charging strategy is devised. The performance of the proposed system is tested under the MATLAB/Simulink platform. Comparison with the conventionally used PID and sliding mode controller under sudden variations in the connected load is presented and discussed. An experimental prototype is built to validate the effectiveness of the proposed controller.

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