Multilevel inverters are one of the preferred solutions for medium-voltage and high-power applications have found successful industrial applications. Five-level active neutral point clamped inverter (5L-ANPC) is most popular topologies among five-level inverters. A six-switch 5L-ANPC (6S-5L-ANPC) topology proposed. Compared to conventional inverters, 6S-5L-ANPC reduces two switches has lower conduction loss. The proposed modulation enables operate under both reactive power conditions....

Multilevel inverters are receiving more attentions nowadays as one of preferred solutions for medium- and high-power applications. As the most popular hybrid multilevel inverter topologies, five-level active-neutral-point-clamped (5L-ANPC) combines features conventional flying-capacitor type neutral-point-clamped (NPC) was commercially used industrial In order to further decrease number active switches, this paper proposes a seven-switch 5L-ANPC (7S-5L-ANPC) topology, which employs only...

In this paper, a new common inductor current sharing method is proposed for multiphase LLC resonant converter high-power applications. Automatic achieved by using connecting the inductors in each phase parallel. The performance of evaluated under first harmonic approximation (FHA) assumption. can automatically share primary and load all phases without any additional circuit control strategy. A 600-W two-phase prototype based on built to verify feasibility. Excellent (less than 0.5% error at...

This paper proposes a new approach to optimally design LLC converters. The core of the proposed is an accurate algorithm that can find all possible designs satisfying peak gain requirement. Designers conveniently evaluate several results and optimal one for their respective applications. Part I this algorithm, which developed based on time-domain resonant waveforms, law charge conservation, conservation energy. Design procedures are also provided computer automation.

In high-power applications, parallel operation is required to improve both efficiency and reliability. an LLC converter, it difficult achieve due the gain sensitivity component tolerance. This paper proposes a new structure of common resonant capacitor for multiphase which can very good current-sharing performance with no additional components or control. To evaluate performance, first harmonic approximation (FHA) model built in this analyze converter coupled tanks. Both FHA analysis...

Diode-capacitor-based dc-dc converters provide a simple and low cost solution for high step-up voltage regulation in solar fuel cell generation. Transient modeling analysis reveals their worse influence of nonlinear nonminimum-phase system characteristic due to right-half-plane (RHP) zero, especially gain application. However, the process energy transfer diode-capacitor-based converter is different from basic converter. Based on unique feature, this paper proposes an improved main circuit...

A passive-impedance-matching (PIM) technology is proposed to achieve automatic current sharing for multiphase resonant converters through matching the input impedance of each phase. The series inductors (or capacitors) phase are connected in parallel a couple virtual resistors including positive and negative variably capacitors). negative) resistor increases decreases) respective phase, can also compensate component tolerance such that matched. current-sharing performance common-inductor...

This paper introduces an efficient strategy to improve the voltage quality of sensitive loads with optimal utilization a dynamic restorer (DVR). Traditional control strategies mainly focus on compensation stage reduce rating DVR or minimize required capacity energy storage device. In addition, phase jump correction in early has attracted more attention as well. reality, issues may occur initial and final stages compensation, they must be avoided for most loads, but few works how can smoothly...

Multilevel inverters are becoming more and popular in photovoltaic applications because of lower total harmonic distortion, switching stress electromagnetic interference. In this article, a single-phase five-level transformer-less PV inverter is proposed for the purpose leakage current reduction. The based on flying capacitor (FC) configuration, voltages FCs balanced at <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub...

To study the influence of impinging height H/D on flow field characteristics oblique submerged jets, numerical calculation an jet was carried out based Wray–Agarwal (W–A) turbulence model. The structure and pressure distribution under various heights (1 ≤ 8) when angle θ = 45° were analyzed. results show that with increase in height, diffusion degree gradually increased velocity decreased reached impingement region, distance between stagnation point (SP) geometric center (GC) increased, φ...

This paper proposed a new half-bridge (HB) LLC resonant converter family with pulse-width modulated (PWM) auxiliary switch (sLLC converter) for hold-up mode operation. The sLLC converters could operate synchronous rectifier, which is suitable low-output voltage applications. In the converters, an added at primary side to provide charging path series inductor. For nominal 400-V input, achieves same performance as conventional converter, and all good features such soft switching are naturally...

Five new biscembranoids, bistrochelides A–E (3–7), were isolated together with glaucumolides A (1) and B (2) from the soft coral Sarcophyton trocheliophorum. Their structures absolute configurations determined by spectroscopic methods, X-ray crystal diffraction, DFT/NMR (density functional theory/nuclear magnetic resonance) TDDFT/ECD (time-dependent density theory/electronic circular dichroism) calculations. approach is introduced to determine relative configuration of a stereocenter through...

Z-source inverter provides a competitive single-stage dc-ac power conversion with the capability of both buck and boost voltage regulation. In order to maximize gain increase efficiency, this paper proposes an improved pulse-width modulation (PWM) strategy. By adjusting shoot-through duty ratio one-phase leg, it regulates average value intermediate dc-link voltage, which is same as instantaneous maximum three-phase line in one switching time period (T <sub...

In data center and telecommunication power supplies, the front-end dc-dc stage is required to operate with a wide input voltage range provide hold-up time when ac fails. Conventional LLC converter serving as not suitable for this requirement, normal operation efficiency (at 400 V input) will be penalized once designed achieve high peak gain (wide range). This paper examined of LCLC revealed that could essentially equivalent set converters different magnetizing inductors are automatically...

Ripple cancellation LED driver can achieve flicker-free driving while maintaining high power factor, efficiency, and low component cost. It is a very competitive solution compared to conventional single-stage or two-stage design. In this paper, primary-side-controlled ripple has been proposed. The voltages of the proposed are sensed at primary side by transformer sensing windings. current also obtained primary-side switching current. entire control circuit built on side. All advantages from...

The single-phase five-level transformerless inverters have been gradually applied in photovoltaic grid-connected systems due to low voltage stress and excellent waveform quality. However, they also suffer from serious leakage current as conventional three-level inverters. In order reduce the current, a inverter is proposed this article. guarantees that common-mode (CM) clamped half of dc-link when outputting ±V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Multilevel inverter are popular solutions in photovoltaic power station, wind farm, and other renewable energy generation. This article presents a three-phase five-level with high dc voltage utilization. A significant feature of the is that its maximum utilization twice traditional inverters such as neutral point clamped, flying capacitor (FC), cascaded H-bridge, active NPC. What more, can realize self-starting self-balancing FC, dc-link capacitors, so complex FC balancing strategy bus...

This paper focused on modeling and performance analysis of linear inverted pendulum design simulation LQR controller. Main to introduce how built the mathematic model it's system performance, then a controller in order get much better control. Simulation is done show efficiency feasibility proposed approach.

Multilevel inverters are preferred solutions for photovoltaic (PV) applications because of lower total harmonic distortion (THD), switching stress and electromagnetic interference (EMI). In order to reduce the leakage current in single-phase low-power PV inverters, a five-level transformer-less inverter is proposed this paper. A eleven switches required, while six them only withstand quarter dc-bus voltage, so costs low. Another four turned on or off at power line cycle, losses ignored....

Conventional single-stage light-emitting diode (LED) drivers with a high power factor (PF) contain significant LED current ripple at twice the ac line frequency, and would require large energy storage capacitors to limit effect on light. designs novel control techniques aim loads dc voltage ensure limited low-frequency ripple. This paper proposes an average modulation method that is designed operate in conjunction PF correction (PFC) circuits ripple, while maintaining zero allows capacitance...

In computer and telecommunication power supplies, the front end DC-DC stage is required to operate with a wide input voltage range provide hold up time when AC fails. Conventional LLC converter serving as not suitable for this task, normal operation efficiency at 400Vin will be penalized once designed achieve high peak gain, i.e. range. This paper examines of LCLC proposes design methodology increase gain without sacrificing condition. operation, behaves like an large magnetizing inductor L...

Memory devices based on <bold>PMPPE</bold> exhibit a rewritable ternary memory behaviour (0, 1, 2, three conductivity states).

The bridge arms of traditional three-phase multilevel converters are independent each other; thus, more active switches and passive diodes required. In order to reduce the number devices, a coupled converter architecture, which is suitable for both dc-ac ac-dc converters, presented. Based on this ten-switch three-level (10S-3P-3L) inverter proposed in article. topology employs only ten no additional diodes, helps cut size, weight, costs system. space vector modulation enables 10S-3P-3L...