This paper presents a novel 400 to 12 V isolated bidirectional dc-dc converter based on phase-shift-controlled-modified dual-active-bridge power stage. The proposed consists of half-bridge and center tap with active clamp circuit, which has promising performance for low-voltage high-current applications. 650 gallium-nitride high electron mobility transistors are used the voltage side avoid issues encountered using Si superjunction MOSFETs in phase-shift-controlled-bidirectional conversions....

Many research works have been conducted on increasing the efficiency of interleaved boost converters (IBCs) applied for power factor correction (PFC) by using high-performance electronic devices and soft switching circuits, which are not helpful in reducing hardware cost systematic complexity. In this paper, three intrinsic parameters affecting IBC PFC found analyzed, including frequency value, inductor output voltage value. Based findings, considering limitations current ripples, factor,...

With the commercialization of wide bandgap power devices such as SiC MOSFETs and JBS diodes, electronics converters used in harsh environments hybrid electric vehicles aerospace attract more attentions. The low loss, high temperature fast switching capabilities are utilized to improve density efficiency. However, EMI problem caused by is a major constrain for improving frequency. For this reason, an integrated module with 1.2kV MOSFET ultra-fast gate drive circuits proposed developed. Two...

A family of bidirectional fractional DC-DC converter for high voltage, power battery energy storage system is proposed in this paper. The has the benefits low cost, efficiency since it only processes part total converted power. One extra voltage pack needed; however, can be from a different rail or seamlessly integrated with pack. System and capacity calculation methodologies are given details. proof-of-concept based on GaN transistor was fabricated. Experimental results 1.2kW prototype...

This paper presents a high efficiency, low-cost bidirectional isolated dc--dc converter for distributed energy storage device (DESD). Derived from dual active bridge (DAB), the proposed consists of half-bridge circuit at voltage side and push-pull with clamp low side. The topology is attractive in current applications it also reduces number switching transistors such that cost complexity are considerably reduced. With single phase-shift control strategy, all switches operate zero-voltage...

The application of a nonisolated bidirectional fractional dc-dc topology is proposed for high power energy storage device in this article. has the benefits ultrahigh efficiency, simple structure, and low cost because it processes only total power. With existence an extra-low voltage (LV) source, converter stress difference between dc bus (HV) therefore, low-cost LV transistors can be used HV applications. Since majority transferred directly bus, system efficiency achieved. Converter...

GaN devices have emerged as a possible replacement for silicon in various power conversion applications and an enabler of new not previously possible. This paper presents 600V Gallium-Nitride (GaN) device based isolated bidirectional DC-DC converter applied battery energy storage systems. Apart from the features low turn-off loss, output capacitance drain-source on-state resistance, most salient one our application is ultra-fast freewheeling "body diode" that when compared with Si devices....

This paper presents design, analysis, fabrication, and measurement of airflow sensors with three hot-wire resistors on an out-of-plane glass bubble. The fabrication process is based etching cavities in silicon wafer, followed by anodic bonding a thin Pyrex wafer to the etched wafer. bonded wafers are then heated inside furnace at temperature above softening point glass, because expansion trapped gas cavities, blown into three-dimensional (3-D) spherical bubbles. Resistors patterned elevated...

High conversion efficiency is always desired in energy storage device (ESD). In this work a high GaN and Si mixed isolated bidirectional dc-dc converter proposed the distributed ESD application. To optimize of half-bridge push-pull active clamp over wide input/output voltage load range, it necessary to accurately predict dissipated power for each component so as identify properly design heavily loaded components. This paper describes universal method losses converter. Loss models are...

This paper presents static and dynamic characterization of 100V 650V Gallium Nitride power transistor from root temperature to 150°C, a physical explanation the device on-resistance behavior at elevated was provided. physics-based understanding would benefit those application engineers who selects GaN HEMT design robust energy efficient electronic system, considering degradation in high ambient.

This paper presents a distributed energy storage device (DESD) based on novel isolated bidirectional DC-DC converter with 650V GaN transistors. The integrates low-voltage (13.2V) Li-ion battery pack, an embedded and wireless communication system. three parts are packaged together, thus it can be directly connected to high-voltage (380V) DC grid, enabling modular approach for systems. Two enhancement mode transistors used at the high voltage side. Compared Si device, improvements achieved in...

This paper investigates three design considerations of a novel bidirectional dc-dc converter for distributed energy storage device. They are the layout minimum loop inductance and heat dissipation, gate drive power supply high side Gallium-Nitride (GaN) device resolution digital PWM control methodology. The special package available GaN devices requires PCB method that takes into account thermal as well switching inductance. Besides, dv/dt will introduce circulating current in high-side...

This paper presents a novel GaN transistor based bidirectional isolated DC-DC converter for stationary energy storage device (SESD) 400V DC microgrid. The improvements achieved in the application includes: first, benefitting from internal ultra-fast free-wheeling diode, converter's operation range can be expended to light load conditions (switches operate hard switching). efficiency greatly increased. Second, because of its low switching loss and on state resistance, heavy is Third, snubber...

This paper reports a novel micro airflow anemometer based on the hot-film sensing principle, i.e. gas cooling of electrically heated resistance. The sensor with three Ti/Pt components width 50μm and thickness 130nm has been fabricated glass tube in UV lithography system multi-layer alignment by our developed MEMS compatible lab-on-a-tube technology. demonstrated high sensitivity, fast response ability to detect wind speed direction. influence environment temperature output voltage when...

The paper reports novel design and fabrication of out-of-plane micro airflow sensors based on the hot-wire sensing principle, i.e. gas cooling electrically-heated wires. Three Ti/Au/Cu resistors have been fabricated an Pyrex bubble with height 300 μm. They are arranged 120 degrees apart sidewall a at 100 μm for velocity direction detection. Air around structure has investigated square circular package designs. sensor axisymmetric demonstrated ability to detect (<10 m/s) determine flow error...

This paper focuses on the design and control of a stationary energy storage system based multiple modular high voltage battery modules. The achieves bi-directional power flow directly from 400V dc grid to 12V modules via dc-dc converter with conversion ratio as an interface. One merit such is its extensibility scalability for higher rating future use by dispatching more together. A 2kWh prototype which made up one grid-connected solid state transformer (SST) emulator two converters are...

This paper reports novel designed and fabricated micro airflow sensors based on the hot-wire sensing principle, i.e. gas cooling of electrically heated resistance. With three Ti/Pt components with width 50 μm thickness 130 nm a glass tube (outer diameter 2.8mm inner 2.1mm) in five degrees freedom (5DOF) UV lithography system multi-layer alignment, cylindrical base have demonstrated high sensitivity, fast response time ability to detect wind speed direction. Environmental characterization...

With the fast development of regenerative braking technologies in modern transportation systems, it has become popular to take into account regenerated electric energy vehicles for energy-saving purposes. In railway transportation, was found that given monotonicity vehicle speed during an acceleration or process, a partial optimisation model can be set up and solved by Mixed Integer Linear Programming. Taking similarity between road traffic rail this paper aims build linear programming...

The paper presented a new energy storage device based on low-voltage (12.8V) Li-ion battery pack with an embedded DC-DC converter. batteries and converter are packaged together. integrated can be directly connected to high-voltage (400V) DC grid, enabling modular approach for systems.

In order to improve spraying results, an inductive electrostatic sprayer was designed. The performance of the then tested. test result shows that charge-to-mass ratio can reach 0.951 mc/Kg when voltage is 20 KV and working pressure 0.25 0.4 MPa. particle size distribution charged droplets are more concentrated than uncharged droplets, axial velocity faster uniformity also improved. average deposition rate under charging conditions 14% higher in conditions. Moreover, deposit back leaf evident.

In this paper, first, a new type of DC/DC converter which is composed by variable winding DC transformer as its front-end and back-end converter, combined four buck converters interleaved with 90 degree phase shift to each other (the output voltage about 25 V uncontrolled for there are several batteries connected it) designed produced on the existing wind power testing experimental integration system. This not only has merits ultra-wide range input voltage, high-precision control current...

The accurate measurement of airflow patterns at high spatial and temporal resolutions is great importance for building design operation. Microelectromechanical Systems (MEMS) technology can be used to develop miniaturized sensors capable detecting both speed direction resolution. Wireless sensor networks (WSNs) are extensively large-scale monitoring Thus, the integration MEMS WSN technologies enables In this work, we developed a prototype MEMS-based network deployed it in environment.

An open-loop start-up method with fixed frequency and variable duty cycle for LLC resonant converter is proposed in this paper. The adopts pulse width modulation (PWM) technology to control switching cycle. Compared conventional that uses a relative high the closed loop, can reduce frequency, then loss driving during process be reduced. Moreover, fast low device`s electrical stress. Because no need method, hardware cost of chip decreased. theory logic detailed analysed correctness...

A scenario-based optimal siting and sizing method of distributed generations (DGs) for the hybrid AC/DC distribution network considering solid state transformers (SSTs) is proposed in this paper. Firstly, an equivalent model multi-port SSTs was established power loss. Based on multi-scene DGs, sequential DC DGs devised through connected to low voltage port without any converter. Then, a bi-level planning constructed as candidate locations. The upper level optimized location capacity...