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Z-source inverters (ZSIs), compared to the conventional two-stage architecture, embrace some interesting features, like the reduced size and complexity of the entire conversion system. Many research activities have been established to improve the performance of the so-called ZSI since it has been proposed in 2003, and several modifications have been introduced since then. These modifications include...
This paper presents a theoretical topology and power loss study on three fundamental inductive switching converters, with focus on high power density and high conversion ratio. With high input voltage and at high switching frequency, efficiency of conventional half-bridge buck converters is severely degraded, due to significant switching loss. Zero-voltage-transition (ZVT) buck and 3-level buck converters...
This paper introduces a topology to combine multiple low voltage Piezoelectric Energy Harvesters with the goal of widening its harvestable frequency range and improving the power output. The architecture uses a shared inductor scheme and a rectifier-free approach. The proposed harvester is able to handle multiple harvesters efficiently by harvesting the peak energy from each harvester. The proposed...
There are mainly two kinds of DC power supply voltages such as 28V, 42V in small and medium power level satellites. A novel cascaded current fed DC/DC topology which can cover all these input voltages was proposed. The working principle of the cascaded topology which composed by a Buck converter cascaded with a current fed push-pull converter was analyzed. With a synchronous rectifier circuit, high...
A single-inductor-cascaded-stage boost regulator topology is presented that time-multiplexes a single inductor using one-nFET-two-pFET power stage and a bias-gated Pulse-Frequency Modulation controller to achieve high conversion ratio. A test-chip in 130nm CMOS demonstrates 120× conversion using a single inductor while consuming 140nA bias current.
This work investigates a step-up topology derived from the Zeta converter: the ZetaBoost. A ZetaBoost converter design for consumer applications is presented and its steady-state performances are compared to a classical Boost converter with the support of computer simulations and measurements. The results presented include the efficiency and output voltage ripple.
The paper presents a new bridgeless Power Factor Correction (PFC) topology, using a recently proposed controllable LCL filter, namely Active Virtual Ground (AVG) to achieve efficient power conversion and high frequency (HF) common mode voltage (CM) reduction. The proposed PFC circuit consists of high frequency semiconductors for shaping inductor current, and low frequency semiconductors to form two...
The use of high voltage allows a power processing system to operate with low currents, improving efficiency. Nevertheless, final applications usually require low voltage inlet, which can be provided using modular multilevel converters submodules, for instance. However, every submodule's gate-unit requires energy from an isolated low power auxiliary supply. Generally, this is done by using an external...
In some high power dc-dc applications, where high voltage is present, a converter with high step-down ratio is required in order to provide an isolated low power auxiliary supply. This requirement represents a challenge and many topologies are currently being researched. The analysis of a non-isolated, unidirectional, high step-down voltage-ratio converter based on a stack of buck-boost converters...
In this paper, a novel single-stage softswitching current-fed full-bridge AC/DC converter is proposed. By adding an additional commutation path, softswitching can be realized for all power devices. The power density is also enhanced by eliminating the DC capacitor. Meanwhile, the conduction loss is also lowered through the use of the additional commutation path. Furthermore, the control strategy for...
The study of a totally passive snubber applied to the T-type NPC converter is presented in this paper. The snubber circuit aids all commutations in all the switches. The voltage across the switches is clamped in a value close to half of the total input voltage. The description of the operation is presented in this paper.
Switched-capacitor (SC) converters have shown significant promise for monolithic integration in a variety of mobile computing applications due to the relatively high energy-densities of modern capacitor technologies and the emergence of deep-trench technology [1-4]. Compared to more traditional buck and boost topologies, the SC approach provides better utilization of active and passive components,...
This work presents an overview of distributed submodule power electronics based on resonant and switched-capacitor topologies configured in a ladder architecture. We present a new resonant switched-capacitor topology, termed a ‘direct conversion’ topology because current flow is always uni-directional in the inductor component. The direct topology can be seen as a resonant version of the more common...
Converter efficiency is vital point in PoE system, as the PSE provided power is limited by IEEE 802.3af/at standard. Besides, the existent power loss through the Ethernet wires and PD interface added another level on the requirement to enhance the solution efficiency. This paper proposes a new topology that meets the IEEE 802.3af/at-compliant powered device (PD) solution for Power over Ethernet (PoE)...
A compact quasi-Z-source DC/DC converter is presented with high voltage gain, isolated output, and improved efficiency. The improvements in size and performance were achieved by using a square wave inverter with only two output switches driving an isolating transformer in push-pull mode, followed by a voltage doubling output rectifier. The converter is well-suited to applications requiring a high...
For a conventional offline Buck-Boost LED driver, significant low frequency ripple current is produced when a high power factor has been achieved. In this paper, an innovative LED driver technology based on the Buck-Boost topology has been proposed. The featured configuration has greatly reduced the low frequency ripple current without compromising power factor performance. High efficiency and low...
In this paper, an new configurable low-side resonant gate driver circuit based on 5V CMOS process is presented. This gate driver is designed for current Gallium Nitride (GaN) power transistor working up to 10 MHz switching frequency. By updating driving signals and removing off-chip resonant inductors, this gate driver can be working as a conventional non-resonant gate driver. Under resonant gate...
New-age power generation systems based on renewable energy systems (RES) mainly constitute of wind generators, solar PV, fuel cells, etc. Energy harvesting from solar PV or fuel cell calls for high step-up inversion owing to its low-voltage input. Conventional voltage source inverter (VSI) can only produce an AC output smaller than its input DC voltage under normal operation. VSI also requires for...
This paper proposes a topology which is based on the traditional LLC resonant converter and has a symmetrical circuit structure to achieve the bidirectional power flow capability. With the advantage of ZVS and ZCS, reverse energy is eliminated, so high efficiency is achieved of the proposed topology, which can be above 97% at full load. In order to be adoptable in bidirectional applications like batteries...
Voltage conversions with high step-down ratios are required in many medium voltage applications for supplying auxiliary electronics. In this paper a new topology for high conversion ratios with low voltage stresses of components, modular structure and simple control is presented. The operation principles are described together with analytical descriptions of the average value of the inductor currents...
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