Current-Mode Control of a Coupled-Inductor Buck–Boost DC–DC Switching Converter
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This paper deepens in the study of the recently described coupled-inductor buck-boost converter. The output voltage of this dc-dc converter can be regulated above and/or below its input voltage with high efficiency and wide bandwidth. The control of the input and/or output nonpulsating converter currents is addressed in this paper. The small-signal control-to-input/output-current transfer functions in open-loop permits the design of the respective average current-mode controllers. The combination of the input- and output-current controllers with an additional output voltage limiter loop is proposed as a method to regulate one of the currents while limiting the maximum values of the other two variables. The theoretical analyses have been validated by means of simulations and also experimentally on a 48-V 800-W purpose built-prototype. In particular, the frequency response measurements that have been carried out for a representative set of the converter operating points are in good agreement with the simulations.Keywords:
Buck converter
This paper presents an alternative of pulse width modulation flyboost converter to achieve a regulated high voltage high power direct current power supply. The proposed flyboost converter in this paper composed with a conventional boost converter and flyback converter, which generated energy from the boost inductor during an off time period. Thus the higher-gain converter can be achieved in the proposed flyboost converter by the summation of both output voltage, boost and flyback converter. The circuit configurations, basic principle operation, mathematics analysis, design consideration and testing results of the proposed high gain step-up flyboost converter were described in detail. Finally, the results of a 20-30V input, 100V 100W output switched at 150 kHz flyboost converter, which was designed in this paper, showed the effectiveness of the converter was 87.26% and 2.76% of voltage regulation respectively.
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In this paper a new single switch Buck-Boost type dc-dc converter is introduced. This converter consists of flyback and forward transformers and only one switch in primary side and one diode in secondary side of transformers. Also this converter operates in both buck and boost modes. In this converter energy transfers to the output in both on and off switch states and controlled by PWM signal. Therefore implementation of control circuits is easy and cheap. Since this converter operates over a wide input voltage range, this converter can be employed as a power factor correction. Theoretical analysis is presented and computer simulation results verify the converter analysis.
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A new Zero-Voltage Transition based two input DC-DC converter sufficient to draw power from two distinct sources feeding a common dc-bus is presented in this paper. This converter belongs to higher-order family and behaves as buck converter for one dc source also it acts as both buck and boost converter with the other source. The significant feature of the proposed converter is that both the sources either singly or simultaneously supply power to the subsequent load at minimal ripple current. This feature is particularly attractive for photo-voltaic power processing applications. The main objective here is to realize the soft-switching by integrating the ZVT cell into the two input DC-DC converter enabling to improve the efficiency by reducing the switching losses in the converter. The digital voltage-mode controller for the converter is designed using SISO tool in MATLAB. A 24V, 96W converter is analyzed and compared with the simulation results
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This paper presents a combination of power factor correction converter using Flyback converter and Full-bridge dc-dc converter in series connection. Flyback converter is operated in discontinuous conduction mode so that it can serve as a power factor correction converter and meanwhile Full-bridge dc-dc converter is used for dc regulator. This converter system is designed to produce a 86 Volt of output voltage and 2 A of output current. Both simulation and experiment results show that the power factor of this converter achieves up to 0.99 and meets harmonic standard of IEC61000-3-2.Keywords: Flyback Converter, Full-bridge DC-DC Converter, Power Factor Correction.
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In this paper, a new transformerless buck-boost converter based on ZETA converter is introduced. The proposed converter has the ZETA converter advantages such as, buck-boost capability and input to output DC insulation. The suggested converter voltage gain is higher than the classic ZETA converter. In the presented converter, only one main switch is utilized. The proposed converter offers low voltage stress of the switch; therefore, the low on-state resistance of the main switch can be selected to decrease losses of the switch. The presented converter topology is simple; hence, the control of the converter is simple. The mathematical analyses of the proposed converter are given. The experimental results confirm the correctness of the analysis.
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This paper demonstrates an alternative of flyboost converter to achieve a high-voltage high power direct current power supply with a gain more than 10. The proposed flyboost converter in this paper composed with a conventional boost converter and quadruple flyback converter, which generated energy from a boost inductor during an off time period. Thus, the higher-gain of boost converter can be achieved by the summation of output voltage, both boost and quadruple flyback converter. Circuit configurations, basic principle operations, mathematics analysis, design considerations and testing results of the proposed quadruple flyboost converter were described in detail. Finally, the results of a 20-30V input, 320V 100W output switched at 150 kHz flyboost converter, which was designed in this paper, showed the effectiveness of the converter was 83.34% and 3.56% of voltage regulation with the gain of 16 respectively.
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In this paper, design and control of the novel SEPIC-Flyback converter(SF converter) is developed as a possible converter for fuel cell system. This output characteristic of SF converter is similar to Buck-Boost converter in that it can step-up or step-down the voltage. With the small signal equivalent circuit modeling of SF converter, control-to-output transfer function is obtained. SF converter couples up the inductive type converter to capacitive type converter with one transformer, which has less ripple current than its respective one does. To verify the validity of the proposed converter, 500W, 100kHz converter is designed and tested. ZVS switching and active clamping are also tested in practice.
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In this paper, a novel voltage-bucking/boosting converter, named as KY buck-boost converter (i.e. 2D converter) is presented herein. Unlike the traditional buck-boost converter, this converter possesses fast transient responses, similar to the behavior of the buck converter with synchronous rectification. In addition, it possesses non-pulsating output current due to this converter always operating in the continuous current mode (CCM), thereby not only decreasing the current stress on the output capacitor but also reducing the output voltage ripple. The proposed converter is illustrated in details and some simulation and experimental results are provided to demonstrate the effectiveness of the proposed topology.
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It's known to all that higher voltage gain is indispensable before grid connecting of renewable energy. Furthermore, auxiliary electronic equipment of electric vehicle also requires relative low rated voltage to ensure regular service. In fact, BOOST-BUCK DC-DC converter (also called Cuk DC-DC converter) could realize ascending and descending of voltage. However, in order to ensure secure operation, electrical isolation measure needs to be adopted as well. Forward converter and Flyback converter are ordinary isolated DC-DC converter. Therefore, combinational Cuk-Forward and Cuk-flyback DC-DC converter are theoretically feasible to meet above requirements. In this paper, modeling and simulation of the two combinational converter have been manipulated with OrCAD-Pspice software. The result shows that the principle of Cuk-Forward and Cuk-flyback DC-DC converter is absolutely accurate. Moreover, the harmonic of output voltage, input current, and voltage stress of switch could also be reduced by optimization design of circuit parameters.
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