PET
Pelotas, Brazil
PET
Pelotas, Brazil

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Davis S.,PET
Power Electronics Technology | Year: 2010

System-on-a-chip (SoC) features programmable flexibility to configure embedded applications controlled by powerline communications (PLC), such as lighting, industrial control, automatic metering, and home automation. The addition of PLC Core to the Cypress SoC inserts the application coding obtained from the programmable analog and digital blocks and microcontroller of the programmable system-on-a-chip (PSoC) architecture that provides a single hardware platform for multiple applications. The frequency shift keying (FSK) signals (RX) from the powerline coupling circuit are sent to a high frequency (HF) band pass filter that filters out-of-band frequency components and outputs a filtered signal within the desired spectrum of 125 kHz 140 kHz for further demodulation. The PSoC platform consists of controller devices that replace multiple, traditional MCU-based system components with one, low-cost, and single-chip programmable device. PSoC devices include configurable blocks of analog and digital logic, and programmable interconnects.


Roger A.,PET
Power Electronics Technology | Year: 2011

Power management ICs become a key element in many portable and vehicle power circuits. Powering such batteries is calling for newer design strategies in the power management circuits that monitor, charge, and maintain battery performance. These circuits are becoming more highly integrated, more efficient and smaller. Many portable consumer electronics products provide fuel gauges that allow users to know when the batteries need charging and how much life is left in that charge. Balancing a rechargeable battery pack's cells is a critical requirement for longer battery life and greater levels of safety. Linear Technology uses passive cell balancing with its LT6802-1 cell-monitoring IC. It is simpler than the active balancing method. The technique works by shunting a resistor across each cell, in a multi-cell series stack, to dissipate imbalance currents, when the stack is fully charged.


Davis S.,PET
Power Electronics Technology | Year: 2011

One of the widely used battery-based electronic systems is the hearing aid, which needs to exhibit high energy efficiency to achieve maximum battery lifetime while providing high performance features, such as programmability. High energy efficiency is a critical design criterion for the electronic hearing aid placed in or around the ear to improve the hearing of those with hearing loss. The hearing aid needs to provide the appropriate amount of sound reproduction and information processing using battery power, with little power consumption. The Series S is a digital hearing aid that can be programmed during the fitting process with multiple patient-selectable listening profiles. The digitization of sound allows more advanced signal processing, such as noise reduction, filtering, and acoustic feedback control.


Sam D.,PET
Power Electronics Technology | Year: 2011

Development in MOSFET on-resistance is reaching new levels with Picor's PI5101 that achieves sub-milliohm values. The RDS(on)FET device combines a high-performance 5V 360ωlateral N-Channel MOSFET with a thermally enhanced high density 4.1mm, 8mm, and 2mm land-grid-array (LGA) package to enable performance in the footprint area of an industry standard SO-8 package. These features enable the device to be suitable for low voltage, high-current power path management applications. The package is fully compatible with industry-standard SMT assembly processes and most off-the-shelf MOSFET controller ICs. The PI5101 is a companion product for Picor's Power Management IC controllers. It enables on-state low power dissipation for applications such as active ORing, hot swap power managers, load switches, and high current DC-DC converters when combined with a compatible Picor controller.


Sam D.,PET
Power Electronics Technology | Year: 2011

Automobile industry experts state that the success of electric vehicles (EV) in the future will depend on its energy source. These vehicles are intended to give power over sustained periods so they must have a high ampere-hour capacity. The price of electricity to run an EV is low as compared with the cost of liquid fuel needed to produce an equivalent amount of energy. Industry estimates note that the cost of buying and recharging a battery is lower than the cost of fossil fuels suitable for propelling a vehicle over its entire service life. Lithium-ion (Li-ion) types offer several advantages over other types of secondary batteries, including lighter weight and higher energy density among all the available battery technologies for EVs. Argonne National Laboratory is addressing the development of individual batteries through a closely integrated R&D effort that addresses the barriers to industry acceptance in an effort to meet future power needs of such vehicles.


Sam D.,PET
Power Electronics Technology | Year: 2011

A high voltage controller and power manager IC combines with any externally compensated DC/DC power supply IC to create a full-featured battery charger. The LTC4000 IC requires an external DC/DC converter to have a control or external-compensation pin whose voltage level varies in a positive monotonic way with its output. It can drive DC/DC converter topologies including buck, boost, buck-boost, SEPIC, and flyback. A programmable output voltage allows it to charge a variety of battery chemistries including lithium-ion/polymer/phosphate, sealed lead acid (SLA), and nickel-based. The IC also provides charge status indicators through its FLT and CHRG pins. This approach simplifies charger system applications, reduces the number of required ICs, and enables faster re-design as requirements change.


Sam D.,PET
Power Electronics Technology | Year: 2011

Wind flow, or motion energy, activates wind turbines that generate electricity. In operation, wind turbines blades spin a shaft that connects to a generator and produces electricity for the utility grid. Wind turbines come in a variety of sizes and power ratings. A large turbine can have rotors longer than a football field and can produce enough electricity to power 1,400 homes. Utility-scale offshore turbines range in size from 450 kW to 3.6 MW. Gear box connects the low-speed shaft to the high-speed shaft and increases the rotational speeds from about 15 to 30 rotations per minute (rpm) to about 1000 to 1800 rpm, the rotational speed required by most generators (alternators) to produce electricity. Vertical-axis wind turbines (VAWT) have the main rotor shaft arranged vertically. Key advantages of this arrangement are that the turbine does not need to be pointed into the wind to be effective. This is an advantage on sites where the wind direction is highly variable, for example when integrated into buildings.


Davis S.,PET
Power Electronics Technology | Year: 2011

A POWER Management Bus (PMBus) interface provides digital power management for dual output and high efficiency synchronous step-down DC/DC controller IC. Multiple designs can be easily calibrated and configured in firmware to optimize a single hardware design for a range of applications. The converter loop gain does not change if the power supply parameters are modified, so that compensation remains optimized for multiple configurations. Products best served by these PMBus functions include high current power supplies employed in telecom, datacom, computing and storage systems. PMBus functions include the ability to program specific power supply management parameters, including output voltage, input voltage, current limit, switching frequency, overvoltage and undervoltage, and output rise/fall times.


Davis S.,PET
Power Electronics Technology | Year: 2011

The new silicon carbide (SiC) Schottky diode has the potential to become an important addition to power supply designs. Infineon Technologies has announced the introduction of its second generation SiC Schottky diodes in the TO-220 FullPAK package from 2010. The new TO-220 FullPak adds the advantage of a fully isolated package, including easier and more reliable mounting without having to use isolating bushings and foil. The TO-220 FullPAK devices show a similar junction-to-heatsink thermal resistance as the standard non-isolated TO-220 devices. This is accomplished by using patented diffusion soldering technique, which strongly reduces the 'chip-to-leadframe' thermal resistance and effectively compensates for the FullPAK's internal isolation layer. Infineon offers the 600V FullPAK portfolio in current ratings from 2A to 6A.


Grant
Agency: National Science Foundation | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 150.00K | Year: 2010

This Small Business Innovation Research (SBIR) Phase I project aims to demonstrate a unique and affordable method to nanotexture the surfaces of metal platform drug-eluting stents (DES) using ultrafast laser surface modification. This technology is relatively inexpensive and capable of integrating with laser micromachining that is widely used for the fabrication of DES, thus have advantages over the existing techniques such as self-assembly, imprint lithography, electron beam etc. Laser-nanotextured DES will be evaluated for biocompatibility, absorption, time release and safety profile by in-vitro tests. The broader/commercial impact of this project will be the potential to provide a cost-effective method to nanotexture DES via laser surface modification, which may improve the drug delivery, prevent thrombosis and enhance the safety profile. Although DES has profoundly affected the field of interventional cardiology by dramatically reducing the problem of in-stent restenosis associated with bare metal stent, the adverse long term stent thrombosis raises the question on the safety profile of DES. Laser nanotexturing will add substantial value to stent manufacturing by preventing thrombosis and helping in storage and supply of drugs continuously for a long term.

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