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Robust fixed-time control for DC-DC converter with matched and mismatched perturbations
(2025-08-01)
Cholahan, Varin
;
Tangsrirat, Worapong
This paper introduces a state-dependent variable exponent coefficient for fixed-time sliding mode control. The proposed state-dependent sliding surface ensures system stability and facilitates a rapid response within a fixed timeframe, while also addressing both matched and mismatched perturbations. This sliding mode control is applied to the DC-DC converter, a system that frequently encounters mismatched issues. By using the fixed-time concept, the designed sliding mode surface exhibits robustness, enabling it to manage both matched and mismatched perturbations within a fixed-time duration. We first present the average mathematical model for the continuous mode DC-DC converter. Next, a state-dependent sliding surface with a variable exponent coefficient is developed. Following next, the controller is designed to regulate the converter's voltage while effectively rejecting both matched and mismatched disturbances. The stability of the proposed approach is evaluated through the use of a Lyapunov function. Lastly, numerical simulations demonstrate rapid convergence and significant robustness against uncertainties in parameters, both matched and mismatched. When compared to other fixed-time and finite-time schemes, the proposed fixed-time controller is notable for its high efficiency and relatively straightforward control solution.
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Design and Experimental Verification of an Integrated Boost-Flyback Converter with Voltage Multiplier
(2024-01-01)
Tattiwong, Kaweewat
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Sopin, Anan
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Poungnoiy, Saisunee
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Kalnaowakul, Phuri
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Singhata, Napassadol
This paper introduces the design and experimental validation of an integrated boost-flyback converter with a voltage multiplier (IBFCVM). It describes the operation of the IBFCVM and provides its essential voltage and current equations. A phototyped circuit design for a 72W, 12V-to-120V IBFCVM is presented. Experimental results demonstrate that the proposed IBFCVM exhibits effective output voltage regulation, achieving an impressive efficiency of 89.9%.
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A Simplified Analysis and Design of an RCD Clamp Forward Converter
(2022-01-01)
Wuti, Virot
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Trakuldit, Siripan
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Luangpol, Amata
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Tattiwong, Kaweewat
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Taylim, Alisala
A conventional forward converter requires a transformer having an extra winding to assist in magnetic core reset, thus complicating the design and increasing the production cost. These shortcomings can be overcome by using an RCD clamp forward converter. This article presents a simplified analysis and design of the RCD clamp forward converter. The laboratory prototype is constructed. Experimental results demonstrates that the prototype converter is capable of providing a constant output voltage throughout its operating condition and has the maximum efficiency of 85%.
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Analysis of reset time for a novel three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy
(2015-01-26)
Kongwirat, Thammachat
;
Jangwanitlert, Anuwat
The paper presents an analysis about the reset time of the primary current for a novel three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy. The analysis shows the presence of the ZVS turn-on condition at outer switches of Branches A, B and C, ZVZCS turn-on and turn-off conditions at inner switches of the branches. For ZCS turn-off conditions at inner switches, DC blocking capacitors also affects resetting of the primary current directly and validates the consistency between simulation results using MATLABR and experimental results, which exhibits good agreement. The converter has maximum efficiency of 93.50% at 5.6 kW.
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Analysis of a wide load variation of ZVZCS phase-shifted PWM full-bridge DC-DC converter
(2014-10-15)
Jangwanitlert, A.
This paper presents a wide load variation of the improved ZVZCS phase-shifted PWM full-bridge dc-dc converter, which can deliver power efficiently. The key operation waveforms of the full-bridge converter from absolutely no-load to full-load conditions are described. In order to confirm wide load variations, the converter should not only operate with soft-switching from full load to no-load condition with satisfactory efficiency for the full range of operation, but the voltage across the output diode bridge also needs to be clamped to keep away from any reverse voltage overshoots arising during turn-off of the output rectifying diodes. In order to achieve zero-voltage switching (ZVS) at turn-on for all load conditions, the converter employs auxiliary coupled inductors near lossless auxiliary circuit. Moreover, the proposed topology is based on a current driven rectifier in order to clamp the voltage of the output rectifying diodes and also obtain ZVZCS of the converter operation, resulting in superior efficiency for all load conditions. In this paper, the converter operation is described. Experimental results provided from a 1 kW prototype validate the feasibility.
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Design of multiple conversion ratio and bidirectional power flow by using dual SC DC-DC converters
(2013-03-28)
Pongswatd, Sawai
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Smerpituk, Krit
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Eguchi, Kei
;
Sasaki, Hirofumi
This paper presents the simple design technique to implement dual SC DCDC converters that can convert input voltage step up or step down. The output of proposed converters is connected between individual converter output capacitors so that the output voltage can convert to multiple levels step up or step down and bidirectional power flow. The conversion ratio can be specified by simple circuit structure by connecting the capacitors in parallel or series. The circuits are designed by digital technique to on-off the switches for step up or step down conversion ratio 1x, 2x, 3x, jx, or 1x, 1/2x, 1/3x, 1/jx, respectively. The characteristics of the proposed converter are clarified by theoretical analyses. In addition, experimentation shows the validity of circuit design, where theoretical results correspond well with experimentation results. The proposed converter will be useful as a driver circuit for battery charger and power battery transfer between different level voltages. © 2013 ICIC International.
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Design of step up and down Bi-directional switched capacitor DC-DC converter
(2012-02-01)
Pongswatd, Sawai
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Smerpituk, Krit
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Eguchi, Kei
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Sasaki, Hirofumi
This paper presents the design technique to implement a DC-DC converter that can convert input voltage with step-up or step-down, and bi-directional power flow. The conversion ratio and power efficiency of the converter can be specified by circuit structure, which has capacitors connected in parallel or series configuration. The conversion ratios of step up and step down are 2x, 3x, 4x,... and 1/2x, 1/3x, 1/4x,..., respectively. The direction of power flow can be controlled by state of input and output switches. SPICE simulation results show that output voltage and power efficiency of the proposed converter agree well with theoretical values. © 2012 ICIC International.
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Analysis and design of SC DC-DC converter for maximum efficiency
(2010-01-01)
Pongswatd, Sawai
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Petchmaneelumka, Wandee
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Prapamonton, Yongyuth
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Eguchi, Kei
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Sasaki, Hirofumi
In this paper, a multiple-state step-up DC-DC converter using switched-capacitor (SC) technique for mobile back-lighting applications is analyzed. Theoretical formulas concerning the conversion ratio between input and output, power efficiency and equivalent circuit are given to estimate the circuit characteristics. To achieve maximum efficiency, the design of clock duty cycle for each state of 4-state circuit structure is presented as an illustrative case study. Based on the proposed analysis and design, the focused DC-DC converter can provide not only maximum efficiency but also wide input range. Simulation and experimental results that agree well with theoretical values are included to confirm the proposed analysis and design. © 2010 SICE.

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