MEMs

Power Monitoring IC

Microchip Technology Inc. (Chandler, AZ) has announced a new power monitoring IC, the MCP39F501. This device is a highly integrated, single-phase power- monitoring IC designed for real-time measurement of AC power. It includes two 24-bit delta-sigma ADCs, a 16-bit calculation engine, EEPROM and a flexible two-wire interface. An integrated low-drift voltage reference in addition to 94.5 dB of SINAD performance on each measurement channel allows accurate designs with just 0.1% error across a 4000:1 dynamic range. Operating temperature range is from -40°C to +125°C.

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Voltage Controlled Oscillator

Crystek's (Fort Meyers, FL) CVCO55CC-3850-3850 VCO (Voltage Controlled Oscillator) operates at 3850 MHz with a control voltage range of 0.5V~4.5V. This VCO features a typical phase noise of -110 dBc/Hz @ 10KHz offset and has excellent linearity. Output power is typically +7 dBm. Engineered and manufactured in the USA, the model CVCO55CC-3850-3850 is packaged in the industry-standard 0.5-in. x 0.5-in. SMD package. Input voltage is 8V, with a max. current consumption of 35 mA. Pulling and Pushing are minimized to 1 MHz and 0.2 MHz/V, respectively. Second harmonic suppression is -15 dBc typical.

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USB Thermocouple Power Sensors

Agilent Technologies Inc. (Santa Clara, CA) has announced the addition of two new models to its U8480 Series USB thermocouple power sensors. The U8480 Series now includes an expanded frequency range to 67 GHz and a measurement speed of 900 readings/second. The U8480 Series’ real-time measurement uncertainty feature, the first of its kind in the industry, significantly reduces overall test time by removing the need for time-consuming manual measurement uncertainty (MU) calculations. Users can now compute MU in real time and at any given point. The feature also allows them to display power measurements and their MU simultaneously.

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Power Management for the Electric Taxiing System Incorporating the More Electric Architecture

With airlines increasingly directing their attention to operating costs and environmental initiatives, the More Electric Architecture for Aircraft and Propulsion (MEAAP) is emerging as a viable solution for improved performance and ecofriendly aircraft operations. An electric taxiing system was developed that does not require the use of jet engines or the auxiliary power unit (APU) during taxiing, either from the departure gate to takeoff, or from landing to the arrival gate.

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Architecture, Power electronics, Electric drives
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Simultaneous Vibration Suppression and Energy Harvesting

The goal of this work was to investigate the concept of using harvested energy to directly control the vibration response of flexible aerospace systems. Small, lightweight, flexible micro air vehicles (MAVs) operate near flutter, providing both harvesting opportunities and vibration suppression requirements. The possibility that the ambient energy might be harnessed and recycled to provide energy to mitigate the vibrations through various control laws was investigated. The goal was to integrate harvesting, storage, control, and computation into one multifunctional structure.

Posted in: Briefs, Physical Sciences, Vibration, Unmanned aerial vehicles
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Cascading Failures in Coupled Distributed Power Grids and Communication Networks

Emerging distributed power grid systems will integrate tightly coupled networks, namely a power grid and a communication network, to provide distributed power monitoring and control. While distributing power monitoring and control away from a central site enhances the robustness of the power grid to multiple, dispersed failures and attacks, such communication-based distributed control schemes can introduce complex cascading failure scenarios in the face of large-scale weapons of mass destruction (WMD) attacks.

Posted in: Briefs, Physical Sciences, Telecommunications, Electric power grid, Hazards and emergency management
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Implementing Interconnected Generation in Future Civil Aircraft

In addition to providing thrust, the engines on conventional civil jet airliners generate power for onboard systems and ancillary loads in the form of pneumatic, hydraulic, and electrical power. There is a move to begin replacing mechanically, hydraulically, and pneumatically powered aircraft systems with electrical equivalents, towards the ultimate goal of achieving the All-Electric Aircraft (AEA).

Posted in: Briefs, Electronics & Computers, Electrical systems, Business and general aviation aircraft
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Electronics Take Charge

Electronic controls are slowly transforming aircraft engines of all types, bringing improved fuel consumption, improved efficiency, and more power. As the functionality of control units for jet engines increases, digital management is also adding more capabilities for helicopters and small piston engines.

Posted in: Articles, Aerospace, Defense, Electronics & Computers, Computer simulation, Computer software / hardware, Electronic control systems, Electronic control units, Jet engines
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Optically Transparent EMI Shielding for Defense and Aerospace Applications

Modern electronic devices and computing equipment are often integrated with wireless capabilities which utilize multi-bands for high speed communication, as well as high speed circuits and high definition graphical displays that operate at a wide range of frequencies. As such, hardware systems are becoming increasingly complex, resulting in products that are highly sensitive to electromagnetic interference (EMI). The vulnerability to EMI is further heightened when multiple components are packed close together within the device due to space, size and weight constraints. As such, traditional shielding methods that employ materials like thick metal Faraday cages are not always practical due to their heavy weight and bulkiness. Despite its complexity, managing this interference and increasing the resilience of components, interconnects and subsystems within the device is crucial to ensuring reliability and functionality.

Posted in: Articles, Aerospace, Defense, Materials, Avionics, Electromagnetic compatibility, Electronic equipment, Optics, Displays, Military aircraft
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Pumped Two-Phase Cooling for Thermal Management of High Heat Flux Electronics

Pumped two-phase cooling provides a compact, low pumping power option for thermal management in high heat flux applications (300-500W/cm2). Compared to single-phase convection, significantly higher heat transfer coefficients can be achieved at substantially lower flowrates. Two-phase cooling also provides a high degree of isothermality, which is important in many applications such as lasers whose emission wavelengths are temperature-dependent.

Posted in: Articles, Aerospace, Defense, Materials, Electronic equipment, Thermal management, Coatings Colorants and Finishes
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