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This paper introduces a digital average current-mode control technique for pulsewidth modulation dc-dc converters which only rely on voltage sampling. The proposed approach is to estimate inductor current using first-order discrete-time low-pass filter; therefore, the controller can calculate average inductor current in every switching cycle. As a novel technique of predictive average current control,...
This paper presents the design of a basic fuzzy logic controller for switching current-mode DC/DC boost converters. The proposed simple fuzzy logic controllers used only nine rules to regulate output voltage. Moreover, they provide an optimal slope compensation to keep the system adequately remote from the first bifurcation point by means of stabilizing around the reference signal. In spite of nonlinear...
This paper presents the analysis and design of a sliding mode controller for buck converters operating in discontinuous conduction mode. An adaptive hysteresis band control scheme is proposed to tightly regulate the output voltage under line and load variations. The proposed method can be employed for other dc-dc converters, and therefore the operation range of sliding mode controllers for dc-dc converters...
The paper proposes a new topology for photovoltaic DC/DC converter with high efficiency under wide input voltage range is proposed. Photovoltaic DC/DC is a very crucial part of power conditioning system(PCS). Considering that output characteristic of photovoltaic cell has wide voltage range, depending on the operating conditions of photovoltaic cell, the DC/DC converter also needs to have wide input...
This paper proposes a class of hybrid dual-operating-mode pulse-width-modulation based sliding mode controllers for DC-DC converters functioning in both the continuous and discontinuous conduction modes. The controllers are simplified hybrid combinations of sliding mode controllers designed for the continuous conduction mode and sliding mode controllers designed for the discontinuous conduction mode...
Fuel cell stacks produce a DC output with a 2:1 variation in output voltage from no load to full load. A power conditioner consisting of DC-DC and DC-AC converters is required for utility interface. The DC-DC and DC-AC stages are operated in high frequency employing PWM control for voltage and current regulation. The switch mode nature of the power converter generates common mode voltage with respect...
One key component of the future automation is replacement of conventional distribution transformers by an all-solid-state (power-electronic) alternative. In this paper, the optimum design of a power electronic transformer (PET) is investigated. In the design process, the PFC and DC-DC converters have been integrated to achieve higher efficiency. The proposed PET performs typical functions and has...
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