This study presents a non-inverting buck–boost converter with an interleaved technique for fuel-cell systems. The transforms the energy into electric current efficiently running mobility Two converters are integrated operation. Thus, switch and diode can be omitted, reducing cost. operation reduces both ripple at output stress of diodes. operating principles steady-state analysis discussed in detail. An 800 W prototype circuit proposed that converts input source (fuel-cell battery 24–45 V)...

Postoperative frailty is an important determinant of postoperative recovery and survival outcomes. Predicting the onset significant importance for rehabilitation elderly people after surgery. Our study aims to develop evaluate a predictive model on 30th day in patients. Data from seven Guangzhou hospitals were collected, encompassing 2,290 patients analysis. This constructed using LASSO regression stepwise regression, optimal was selected based comparison. Model performance assessed through...

A novel bidirectional DC-DC converter with high conversion ratio is proposed in this paper. The uses the coupled-inductor to achieve voltage ratio. In boost mode, cascaded by and flyback double increase gain. switch stress reduced a clamping circuit, leakage-inductor energy recycled. buck circuit consists of asymmetrical half-bridge converter. recycled all switches zero-voltage-switching turn on. This paper first analyzes operating principles steady-state characteristics. Eventually,...

The bidirectional DC-DC converters are widely used in the energy storage system (ESS) and DC distribution system. power capacity is limited when converter operated with smooth transfer. In addition, directions of inductor current capacitor voltage cannot change instantaneously. this study, a rapid conversion technique for smoothing accelerating transfer under same specification main components steady state proposed. Moreover, high ratio proposed to overcome commonly low input from renewable...

Bidirectional DC–DC converters are key devices in the DC distribution system and energy storage (ESS). It is important to consider safety of elements converter for rapid conversion power direction. Damages may occur power-related components circuit if direction inductor current or capacitor voltage changes instantaneously. To make flow change smoothly quickly, this research proposed a bidirectional with transition technology implemented architecture. The added resonance path based on LC...

Although preoperative C-Reactive Protein to Albumin Ratio(CAR) is one of the important indicators for surgical risk assessment, relationship between CAR and postoperative outcomes in older patients undergoing non-cardiac surgery still unclear. Therefore, purpose this study explore adverse surgery.

To find the optimal magnetic components designing process within dimensional limitation, different inductor arrangements are developed. Different combinations of air-gaps and material used limited bobbin space to improve saturation current capacity already set dimension. In this study, mechanism requirement at 1U height is limitation. There two center-pole cores, air-gap distribution arrangement in components. The value, flux density, fringing, power loss inductors investigated with...

In this paper, a hybrid dimming inverter for T5 fluorescent lamp is analyzable and designed. By using the digital analog dimming, current stress of switches reduced, range can be extended. A high-frequency with DC 400V voltage source to drive single 28W implemented. The preheating, starting-up function, control circuit soft-transition operation are Also, effectiveness analog, compared. They show that reduced by 10% at lightly load, 100% 20% efficiency up 90% full load condition.

This paper presents a novel two-stage electronic ballast for metal-halide (MH) lamps. The first stage is single-switch buck and buck-boost integrated converter. post half-bridge inverter driving the MH lamps with low-frequency square-wave current. operating principle of proposed topology discussed. Also, constant power control realized using methodology employed peak inductor current control. Finally, laboratory prototype 70 W lamp operated 200~264V input voltage implemented to verify feasibility.

This paper presents a novel two-stage electronic ballast for metal-halide (MH) lamps. The front stage is single-switch boost and buck-boost integrated converter. post half-bridge inverter driving the MH lamps with low-frequency square-wave current. operating principle of proposed topology discussed. Also, constant power control realized using methodology employed peak inductor current control. Finally, laboratory prototype 70W lamp operated universal input voltage implemented to verify feasibility.

This research proposes an LED driving circuit with stand-alone photovoltaic (PV) power. A bi-directional converter is incorporated to adequately distribute powers among the solar-cell panel, battery and lamp according sunshine intensity, state-of-charge as well load requirement. By matching voltage-current (V-I) characteristic curves, capacities of panel are specified mostly operate around maximum power point. The proposed applied a scenario traffic light application. operated near point,...

This paper proposes a boost power factor correction (PFC) circuit with different cores. Inductors are critical components in electronic circuits; accordingly, reducing the volume and enhancing efficiency essential. It is well-known that magnetic elements have great influence on density, cost performance of circuits. In this work, cores were chosen to compare analyze such characteristics related influences circuit. doing so, 3-D finite-element analyses for exemplary inductor focused on. The...

This paper proposed a method for analyzing the bus capacitors in uninterruptible power source (UPS) system. The manufacturers can only evaluate usage status of during regular maintenance time because UPS system needs to run 24 hours. However, this be checked once few months and must shut down. is analyze current state capacitor real by measuring characteristics circuit prediction remaining life capacitor. Avoid impact on bad output quality cause load fault. help engineering calculate capacitors.

This paper presents a two-stage electronic ballast for metal-halide (MH) lamps with frequency modulation (FM) control scheme. The proposed consists of boost power-factor-correction (PFC) converter and half-bridge series-resonant parallel-loaded (HB-SRPL) inverter. PFC circuit is operating in continuous conduction mode (CCM) to achieve high power factor, the HB-SPRL inverter, which supplies HID lamp sinusoidal wave current by avoid acoustic resonance. principles topology are discussed. Also,...

With the increasing popularity of renewable energy and rapid development power semiconductor technology, application solid-state transformer will be more widely used. Solid-state increases operating frequency which can significantly reduce volume weight magnetic components. The resonant converter is made by seniors laboratory reviewed in this paper. 10 kVA cast resin analyzed. Then, larger carried out. This paper mainly focuses on parameter design insulation considerations 40kVA high...

In this paper, a novel bidirectional boost/buck converter with coupled inductor is designed and implemented. When batteries release energy to DC bus, functions like parallel boost inductor. With proper design, ZVS turn-on ZCS turn-off can be respectively realized by primary side switches secondary switch parasitic diodes. manner, the switching loss reverse recovery problems are reduced, thereby improving efficiency. Finally, laboratory prototype circuit 110 V/ 400 V output power of 1 kW...

There is an increase in renewable energy sources, which are regarded as current where DC-DC converters widely used require more suitable loads for driving type loads. This paper uses a duality approach to show that the converter circuit can apply without too much voltage variation. It illustrates derived steps conventional buck by using graph formation. To validate approach, five original switching detailed. A source with R-L load (CSRL) current-based applications, such electrical motors,...

In this paper, a novel ZVS buck converter with lower voltage stress based on coupled-inductor and active clamp techniques has been proposed. This utilizes to obtain higher step-down ratio than the conventional converter. Moreover, proposed can achieve (Zero-voltage switching) both switches from full load extra-light load. Therefore, efficiency at light does not subject switching losses, which leads overall efficiency. The conditions design considerations of are described. region cover range,...

As the progress of wide-bandgap (WBG) semiconductor devices and rise distributed energy resources (DER), medium-voltage solid-state transformer (SST) becomes more popular in recent years. Medium-voltage SST features high-performance fantastic functionality. The proposed this paper is applied 11.4 kVAC distribution system. high-voltage terminals are connected series, low-voltage ones parallel. Steady-state analysis components design converter as well parameter design, insulation consideration...

In this paper, developing a novel force turn-off method of silicon controlled rectifier (SCR) device. SCR is mainly used as component the UPS to be inserted into static transfer switch (STS). Although can withstand penetrating short-circuit current, it needs have ability quickly cut off fault current when an accident occurs. The protection curve for uninterruptible power system (UPS) coordination and other problems. When occurs, proposed in short time. A bypass STS online by using proposed....

A compact and 25-kV isolated gate driver with various protective features has been implemented for 3.3-kV SiC power modules. The design procedure circuit production is described in detail. With the driver, double pulse test (DPT) performed to evaluate switching energy losses parasitic loop inductance at different voltage conditions. Additionally, DPT together Ansys Software are used characterize stray inductances.

This research presents a novel architecture for bidirectional DC-DC converter. The primary purpose of converter is to facilitate energy transfer between battery side and DC bus. One the key benefits this its improved efficiency reduced volume. To achieve this, utilizes an active switched inductor structure. In step-up mode, parallel charging series discharging are accomplished by employing two sets synchronous switches inductors. Conversely, in step-down charging, achieved using same...

The objective of this paper is to modify the topology unidirectional non-coupled inductor modified SEPIC converter a bidirectional and applied between DC bus battery energy storage system. To improve conversion ratio, active switched inductors are employed, eliminating need for coupled or transformer. This approach offers several advantages, including continuous input current non-inverting output. Furthermore, by increasing switching frequency utilizing wide bandgap components such as...

In this paper, a novel self-balancing seven-level inverter with coupled inductor is proposed. The proposed can generate voltage only two capacitors, and there are series charged parallel discharged path to auto balance the capacitors voltages. Compared same level traditional topologies, new topology uses fewer components achieves without any voltage-balancing circuit or complex control method, so smaller size of higher power density be realized. total harmonic distortion output low. scheme...