A new class of high-voltage-gain dc-dc converters for high-efficiency and transformer-less applications, where large voltage step-up ratios are required, is presented in this paper. The converter derived from the hybrid integration a switched-capacitor boost converter. It features high conversion ratio with moderate duty cycle, nonpulsating input current, low-voltage stress on all switches, easy implementation control driving circuits, scalability high-current high-power low cost due to...

A multiphase-interleaved non-isolated high step-up dc/dc resonant converter for high-current applications with wide load range is proposed in this paper. The consists of an inverter stage multiple inverters parallel interleaving operation that cascaded to a common diode-capacitor rectifier stage. topology the variation class E inverter, which designed voltage boosting and gain insensitive change. comprises pairs (correlated number parallel) diodes small output capacitor, makes it simple...

High-step-up dc/dc converters are widely required in grid-connected applications with renewable energy sources. An extremely high-ratio step-up nonisolated converter, the form of a harmonics-boosted resonant is proposed this paper. This converter consists high-frequency dc/ac inverter stage that followed by passive ac/dc rectifier connected cascade. Conventionally, such designed to output pure sinusoidal ac voltage an amplitude several times input voltage. However, for contain selected...

Salinity gradient power (SGP) between fresh river water and sea is a form of renewable energy with huge potential but not well explored. This paper presents feasibility study on harvesting SGP based on: 1) the use reverse electrodialysis (RED) stack, 2) combined harmonicsboosted resonant inverter multistage diode-capacitor step-up converter. The properties an RED stack have been characterized into steady-state ac dc equivalent circuit models for converter design first time. gains are also...

A back-back HVDC interconnector project is under construction at Luxi, Yunnan Province, China. One of two links the rated 1000 MW using VSC-HVDC technology. The secondary side converter transformer grounding through a 5kΩ resistor. maximum steady-state loss(MSL) resistor determines size and thermal designing resistor, meanwhile influences overload protection setting. In this paper, loss different operation modes analyzed. It can be concluded that MSL appears blocking state. Then, theoretical...

In this article, a highly efficient wireless power transfer (WPT) system is realized by employing the proposed single-switch step-up resonant inverter with series–series-compensated network. This has merits of simplified circuit structure, low component count, inherent voltage boosting, zero-voltage switching (ZVS), and high efficiency. Based on equivalent model, two-coil WPT analyzed in frequency domain, which shows that quasi-constant current (CC) primary side corresponding (CV) secondary...

A non-isolated high-step-up resonant DC/DC converter made up of a inverter and passive switched-capacitor (SC) rectifier, is proposed in this paper. The free transformer coupled-inductor. Thus, issues related to the leakage inductance large volume magnetic component caused by turn's ratio high-voltage-gain applications, are avoided. Besides, as contains only one active switch, its control simple. Second harmonic voltage across switch attenuated provide low stress for higher gain converter....

High-voltage-gain and wide-input-range dc-dc converters are widely used in various electronics industrial products such as portable devices, telecommunication, automotive, aerospace systems. The two-stage converter is a adopted architecture for applications, it proven to have higher efficiency compared with that of the single-stage converter. This paper presents modular-cell-based morphing switched-capacitor (SC) application front-end conversion ratio this flexible variable can be freely...

A modular converter, due to its standardized product cycle, has the advantage of a low design, manufacturing, installation, and maintenance cost. In this article, reconfigurable bidirectional fully converter using switched-capacitor (SC) modules is proposed. The change in power rating voltage gain achievable with number configuration modules. guideline choosing module topology proposed let SC be freely assembled achieve different structures. To converters minimized modules, triangle...

A compact modular switched-capacitor DC/DC converter with exponential voltage gain, high efficiency, light weight, and bidirectional power flow, is proposed in this paper. The suitable for applications temperature environments since it does not contain magnetic element nor temperature-sensitive capacitor. With an output that 2N (N the cell number) times low-side voltage, has a considerably low component count suffers from lowest overall capacitor stress as compared other existing converters....

Salinity gradient power (SGP) derived from sea and fresh water through reverse electrodialysis (RED) is an emerging discipline with huge potential for carbon-free energy harvesting.SGP technology still in infant stage there a need accurate mathematical tools to study its harvesting process.Previous models assume constant salinity continuous flow of salinity.In the case recycling used water, such assumption no longer valid because reduces operating time.This paper presents generalized RED...

The paper presents a novel over current protection circuit in digital power amplifier. would be used to shut down the output buffer when two pins short-circuit supply, ground or each other. Chip achieves maxim of 2.75W and efficiency 92% at 4Ohm load supply voltage is 5V. operates wide area from 3V 5.5V. It fabricated 0.35um, double poly, triple metal CMOS process. THD as low 0.1%, with flat band response between 20 Hz KHz. over-current threshold about 3A.

High-voltage-gain and wide-input-range DC-DC converters are widely used in various electronics industrial products such as portable devices, telecommunication, automotive, aerospace systems. The two-stage converter is a adopted architecture for applications, it proven to have higher efficiency compared with that of the single-stage converter. This paper presents modular-cell-based morphing switched-capacitor (SC) application front-end conversion ratio this flexible can be freely extended by...

Salinity gradient power (SGP) is a kind of promising renewable energy source with huge potential, which can be derived through reverse electrodialysis (RED). Generally, RED stacks operate at either continuous mode or recycle mode, both possess respective advantages in different application scenes. Since SGP technology still an infant stage, there few research focusing on maximum-power-point-tracking (MPPT) techniques stacks, are crucial for the effective utilization SGP. In this article,...

Nearest Level Modulation (NLM) is a kind of staircase wave modulation suitable for MMC with massive submodules. There are several implementations NLM different application scenarios and operation conditions. In order to discuss the feasibility inner stability MMC, state-space system established firstly represent internal dynamics. Based on these results, Lyapunov theory introduced analysis. Optimized designs improve also discussed. The analysis this paper shows that depends whether measured...

This paper presents a self-adaptive incremental-resistance maximum-power-point-tracking (INR-MPPT) method to achieve maximum power extraction from recycle-mode (R-mode) operating reverse-electrodialysis (RED) stack. By considering the electrical characteristics of R-mode RED stack, design principle INR-MPPT method, which involves its scaling factor and sampling period, ensure both fast response system stability, is discussed. The validity proposed verified by simulation experiments.

The paper presents a self-recovering short-circuit protection circuit for RF class-D power amplifier whose output is connected to 50Ohm load in 24V supply. can make the MOS transistors shut down quickly when occurs. Moreover, those also be voluntarily started-up again once disappears. Fabricated CSMC 0.25μm enhance BCDMOS process, work stably and accurately under all kinds of condition. analysis design methods discussed this provide beneficial references other chip about technological.

We consider the uplink of a single-cell multiuser MIMO-OFDM system with MRC receiver and large antenna arrays at base station. Assuming that channels are perfectly estimated by pilots, we analyze spectral efficiency, taking pilot overhead into consideration. The closed-form expression for efficiency is derived optimal number users in such discussed. Our studies also show per performance gain decreases as total increases. Numerical results presented to verify our analysis.