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This paper proposes an active-clamp resonant circuit in flyback DC-DC Converter for single phase grid-tied photovoltaic (PV) system. The resonant circuit recycles the energy stored in the leakage inductance of the transformer, limits the voltage stress of the main-switch of the DC-DC Converter during the turn-off process, and provides zero-voltage switching (ZVS) turn-on of the primary switches. Therefore,...
This paper proposes a repetitive controller to be used for capacitor-less current-fed dual-half-bridge (CF-DHB) converters under the grid-connected environment. When the dc-link capacitor is very small, the dc-link current fluctuation can distort the input current severely. Compared with the previous controllers introduced to reduce the input current ripples, the proposed repetitive controller can...
This paper introduces a robust, hardware-efficient auto-tuned digital controller applicable to various hard switching dc-dc converters, including indirect energy transfesr topologies. Unlike existing fast transient controllers for indirect energy transfer converters, the controller achieves fast transient response and practically minimum deviation of the output voltage without depending on information...
The Series-Resonant dc-dc converter (SRC) is widely applied in a large range of voltage and power. In most applications, fault tolerance is a highly desired feature and it is obtained through redundancy. This paper proposes a fault tolerance solution for the SRC, which could drastically reduce the need of redundancy. Using the proposed scheme, the full-bridge based SRC or multilevel based SRC can...
This paper presents a new galvanically isolated step-up dc-dc converter intended for low-power but high step-up applications. The proposed converter is capable of regulating output voltage within a wide range of the input voltage or load variations. In contrast to competitors, the converter can be implemented with fewer passive components. Soft-switching in semiconductors allows achieving high efficiency...
Central inverters based on conventional topologies are the current preferred solution in solar farms because of their low cost and simplicity. However, such topologies have some disadvantages as poor maximum power tracking, use of bulky filters and low frequency transformers. A good alternative in this case is the SiC-based Cascaded Multilevel Converter (CMC), which provides a distributed MPPT control...
This paper develops a steady-state analysis for the inductor current behavior and requirements in a single-inductor multiple-input single-output power converter (SI-MISO) topology with time-multiplexing control scheme. The SI-MISO can potentially reduce the number and size of components which is of benefit in many applications. However, it is important to appropriately select and control (1) the ratio...
In order to reduce the system cost, volumetric size and weight of an electric vehicles (EVs) battery charger, a novel four-switch two-leg VSI configuration is propose for rapid battery charging with the active power filter (APF) features. It consists of cost-effective two-arm bridge converter, coupling inductors, LC filters, buck converter and EV battery. Note that the conventional three-leg bridge...
This paper introduces a multi-phase interleaved dc-dc converter, targeted for high-step down applications including voltage regulator modules (VRM) for microprocessors, where low volume and high efficiency are the key priorities. The introduced architecture, reducing the voltage swing at the switching node, along with doubling the effective switching frequency of the inductor current ripple, allows...
DC-to-DC power supplies for CPUs or GPUs are critical components on the motherboard of modern computer systems. Converting an intermediate bus voltage (e.g. 12 V) to the core voltage (∼0.9 V) of CPUs or GPUs must be efficient, compact and cost effective. This paper proposes an active-clamp forward converter (ACFC) power block to supply core voltage on a motherboard. The ACFC power block can be individually...
This paper presents a novel modular multilevel switched-capacitor based resonant converter (MMSCRC) to achieve dc-dc power conversion function. In comparison to existing multilevel modular switched-capacitor circuits, the proposed switched-capacitor resonant converter (SCRC) possess voltage regulation capability. Its modular structure accomplishes voltage conversion function and proposed closed-loop...
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