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A CLTCL resonant dc-dc converter is proposed in this paper. Through the dual-transformer architecture, the resonant characteristic of the converter alters and contributes to a wide input voltage range and a greatly broadened output voltage range from zero to the nominal. The transformer leakage inductors also participate in the resonating process, which eliminates their side effects on the conversion performance. Moreover, a simple and effective design method for converters with multiple resonant components is used to guide the resonant parameter design with the assistance of the MATLAB program. Soft switching for both turn-on and turn-off processes of all the inverter and rectifier switches is acquired, and the proposed converter, therefore, achieves lower switching losses among a wide load scope. In the end, a 1-kW prototype with a peak efficiency of 97.3% is fabricated in the laboratory to verify the working principle and design effect of the CLTCL converter. [ABSTRACT FROM PUBLISHER]

This paper presents a new isolated auxiliary current pump module (ACPM), to improve the dynamic response of dc–dc converters under load transients. The developed isolated ACPM can be used as a generic auxiliary module for both isolated and nonisolated step-up/step-down dc–dc converters. The isolated ACPM is a low-power bidirectional converter, designed with higher bandwidth and operates only during the load transients. The performance of the developed auxiliary power converter has been evaluated in conjunction with an interleaved boost converter as main converter, which suffers from poor dynamic performance due to inherent right half plane zero effect. A suitable control scheme is designed and implemented for interleaved boost converter operating in conjunction with proposed isolated ACPM. Load current injection circuit employed in the proposed control scheme eliminates the requirement of complex nonlinear control algorithms. The proposed control scheme in particular suits for current-mode controlled converters operating along with isolated ACPM. Experimental results for a 250-W 100-kHz interleaved boost converter prototype with ACPM are presented. The peak overshoot/undershoot and the transient recovery time are reduced significantly with the incorporation of developed isolated ACPM. [ABSTRACT FROM AUTHOR]

This paper presents simplified nonlinear averaged large-signal and linear small-signal models of the three basic dc–dc converter topologies, boost, buck, and noninverting buck–boost, respectively, operating in peak current-mode control. Models have been derived for the continuous and discontinuous conduction mode. The modeling methodology used is the equivalent current injected method. The derived models have been compared to the existing full-order large-signal nonlinear models and have been found to exhibit simulation time reduction by a few magnitudes in complex distributed power systems, such as today’s popular microgrids. The models developed have been experimentally verified on a custom-built 120-W boost converter prototype, showing great accuracy in steady state and in dynamical behavior in all operating points, as determined by the output resistance. [ABSTRACT FROM PUBLISHER]