This letter proposes a novel three-phase hybrid rectifier topology and control method for high power electrolytic hydrogen production application. It is composed of primary rectifier, i.e., six-pulse silicon controlled (SCR) an auxiliary converter, including pulsewidth modulation (PWM) voltage source converter phase-shift-full-bridge converter. SCR undertakes most the consumed by electrolysis cell, can compensate dc current ripples absorb ac harmonics simultaneously. Compared with PWM...

To solve the problems of existing nonisolated PV grid-connected inverters, such as leakage current, power pulsation, and harmonic a single-phase common-ground-type inverter with decoupling capability is proposed in this article. The integration traditional boost converter switched capacitor technology obtains structure that neutral point grid directly connected negative terminal array, current eliminated. Due to time-sharing multiplexing circuit components, which can achieve high step-up,...

The preparation of Ni-Mo alloy coating by pulse current technology was discussed in this study. We adjusted the bath composition citric acid-ammonia solution, and changing different parameters such as duty cycle frequency to obtain property coating. This study investigated coatings properties that including element variations, corrosion resistance, mechanical properties, etc. all were related deposited parameters. Scanning Electronic Microscopy (SEM) used observe surface morphology...

Transformer and electrolytic capacitors (Ecaps) in light-emitting diode (LED) drivers lead to increased cost shortened lifespan. Therefore, eliminating the transformer Ecaps of LED driver can not only achieve a lightweight design but also extend service life. In this article, novel single-phase transformerless capacitorless power factor correction rectifier is proposed. The proposed topology shares common ground with grid load. Thus, reduced common-mode current obtained, demand for an...

Given the lack of transformer isolation in operational non-isolated photovoltaic inverters, common mode leakage currents are known to exist within stray capacitance array, leading electromagnetic interference and safety concerns for entire system. This article introduces a novel solution: ground multilevel PV inverter. innovative design is built upon Boost circuit incorporates switched capacitor network connect negative terminal dc side neutral point ac side. The primary objective this...

Microinverter without transformer structure is widely used in photovoltaic grid-connected systems because of its low cost and high efficiency, but the challenge to solve common-mode leakage current caused by voltage. This paper studies a novel transformerless dual-mode voltage source inverter (VSI) which common ground short-circuits parasitic capacitance theoretically completely eliminates currents. The consists switching-buck-boost (SBB) module integrated with an LC filter network has good...

Reducing power transmission path is a new trend to increase the whole efficiency. Moreover, electrolytic capacitors (E-caps) are another essential criterion for judging performance of converters. Based on this, novel single-stage ac/dc converter proposed in this article, which demands fewer semiconductors compared previous works due time-sharing devices; thus lower cost and higher density achieved. The flow decoupling circuit further optimized, where most energy designed transfer directly...

Addressing the issue of dual-frequency oscillation on DC side, caused by absence electrolytic capacitors, a three-port rectifier with automatic power factor correction and decoupling capabilities has been proposed for LED lighting applications. This aims to tackle problems associated improve overall performance systems. Compared existing topologies, converter highly integrates main auxiliary circuit sharing switch, which effectively reduces redundancy elements circuit. The only two switches...

This article presents a method to solve the three major problems of bridgeless rectifiers, that is, existence output filter units, multistage transformation, and dual-frequency power pulsation without electrolytic capacitors (E-caps). In this article, virtual port is introduced integrated with main circuit. Meanwhile, sharing devices greatly reduces redundant devices, especially high-loss magnetic devices. An excellent switching control scheme ensures adaptability under decoupling capacitor...

The particle swarm optimization algorithm is used extensively for global search in indoor positioning. However, owing to the large area and insufficient accuracy of search, it may converge too early or fail find optimal solution, which can negatively impact In this study, we propose an improved localization method based on weighted adaptive K-nearest neighbor (WAKNN) address issue. Our first employs WAKNN fingerprint matching then selects suitable reference points (RPs) limit actual presence...

Aiming at the problems of high complexity and large calculation quantity in existing digital control strategies for single-inductor dual-output (SIDO) converter, this paper proposes a simple reliable compensation technology to suppress cross-regulation. The design is only related selected circuit topology, thus it will not be redesigned different strategies. Taking predictive current-mode (DPC) controlled SIDO buck converter as an example, small signal model firstly established. Based on...