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This paper presents design and implementation of a Integrated boost-flyback converter (IBFC). Operation of the IBFC is described and its key voltage and current equations are given. The practical design of a 96W, 12V-to-48V, IBFC is demonstrated. Experiment on the prototype IBFC shows that it operates with good output voltage regulation and achieves the highest efficiency of 87%.
This paper presents analysis, design and experimentation of a Quadratic Boost Converter (QBC). Operation of the QBC is analyzed, leading to mathematical expressions that can be used to design the converter. Based on the derived analytical expressions, a 100W, 12V-to-48V, QBC converter is designed and built. Experiment shows that the prototyped converter operates satisfactorily throughout its operating...
This paper presents improvement of an output performance of a two-switch forward converter with a Lead-Lag (LL) controller. The controller design is illustrated and its ability to regulate the converter's output voltage is evaluated experimentally. It is revealed that the converter employing the LL controller can achieve a higher system bandwidth compared to that employing the Proportional-plus-Integral...
Advantages of a two-switch forward converter over its single-switch counterpart are that it operates with reduced voltage stress on power semiconductor switches and does not require a transformer with a reset winding. The lower stress on the switching devices leads to increased reliability and, without the reset windings, the transformer production is simplified. In this paper, feedback compensator...
This paper presents a parallel voltage controller to improve the output dynamic performance of a buck converter with Average Current Mode Control (ACMC). The parallel controller is a high-order controller synthesized from parallel connection of the two basic controllers. It is proposed to compensate the control-to-output transfer function of the converter, which has multiple poles and zeros. Up until...
A Zeta converter is a fourth-order DC-DC converter made up of two inductors and two capacitors and capable of operating in either step-up or step-down mode. Compared with other converters in the same class, such as Cuk and SEPIC converters, the Zeta converter has received the least attention, and more importantly, its dynamic modeling and control have never been reported before in the literature....
A SEPIC (single-ended primary inductor converter) DC-DC converter is capable of operating in either step-up or step-down mode and widely used in battery-operated equipment. There are two possible modes of operation in the SEPIC converter: Continuous conduction mode (CCM) and discontinuous conduction mode (DCM). This paper presents modeling of a SEPIC converter operating in CCM using the state-space...
A SEPIC (single-ended primary inductor converter) DC-DC converter is capable of operating in either step-up or step-down mode and widely used in battery-operated equipment. There are two possible modes of operation in the SEPIC converter: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). This paper presents modeling of a SEPIC converter operating in DCM using the state-space...
A Zeta converter is a fourth-order DC-DC converter made up of two inductors and two capacitors and capable of operating in either step-up or step-down mode. Compared with other converters in the same class, such as Cuk and Sepic converters, the Zeta converter has received the least attention, and more importantly, its dynamic modeling and control have never been reported before in the literature....
A zeta converter is a fourth-order DC-DC converter made up of two inductors and two capacitors and capable of operating in either step-up or step-down mode. Compared with a Cuk or Sepic converters, the zeta converter has received the least attention and its dynamic properties have never been reported before in the literature. This paper presents dynamic modeling of a zeta converter with state-space...
In this paper, feedback control design of Zero-Voltage-Switched Quasi-Resonant dc-dc converters is presented. The power stage model is derived by a method of circuit averaging, while the control stage model, consisting of an Error Amplifier (EA) and Voltage Control Oscillator (VCO), determined by the input/output relationship of the circuits. The obtained models are used in feedback control design...
This paper proposes a novel current feedforward average current mode control (CFACMC) technique to improve output dynamic performance of DC-DC converters. In this new control scheme, besides its usual role as a feedback variable to a current controller, the sensed inductor current is fed forward, through a low-pass filter circuit, to sum with an output signal from a voltage controller to form the...
This paper presents the design of a single-stage single-switch power-factor-corrected (S4PFC) AC/DC converter. The converter under study is an integration of boost and flyback converters. The converter operation is equivalent to its two-stage counterpart with switches in the PFC and DC/DC converter stages turned on and off at the same time. Based on this observation, power circuit and control loop...
In this paper, modeling and simulation of DC-DC converters under SIMULINK environment is presented. The modeling is performed with a buck converter, employing three different control schemes: voltage-mode control, current-mode control, and average current-mode control. The resulted models are a nonlinear average model that can be used to simulate the converter performance under large-signal condition...
In this paper, modeling and control design of a current-mode controlled flyback converter with optocoupler feedback is presented. Small-signal models of the converter operating in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are derived and used in control design of the prototype converters, with the results confirmed by experiment
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