Allegro MicroSystems, Inc. Releases New Family of User-Programmable, Two-Wire, Unipolar, Hall-Effect Switches
Allegro MicroSystems, Inc. has introduced a new line of user-programmable, two-wire, unipolar, Hall-effect switches to complement its existing family of devices used in seat belt buckle, seat position and shift selector (PRNDL) applications. These new devices are targeted to serve the automotive market, because they include improved high voltage transient protection; a critical feature for applications that do not allow for protection circuits to be located close to the sensor.
Allegro’s A1190/2/3 family consists of two-wire, unipolar, Hall-effect switches, which can be trimmed by the user at end-of-line to optimize magnetic switchpoint accuracy in the application. These devices are produced on the Allegro advanced BiCMOS wafer fabrication process, which implements a patented high frequency, 4-phase, chopper-stabilization technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments.
The A119x family has a number of automotive applications. These include: sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in cost-sensitive applications because they require one less wire for operation versus the more traditional open-collector output switches. Additionally, the system designer inherently gains diagnostics, because there is always output current flowing, which should be in either of two narrow ranges. Any current level not within these ranges indicates a fault condition.
An important upgrade to this family of two-wire switches is the on-chip transient protection and a zener clamp to protect against over-voltage conditions on the supply line. This improved high voltage transient protection allows these devices to survive ISO 7637-2 and 40 V load dump for <0.5 seconds with minimal, and sometime no, protection from discrete components. The ESD protection has been enhanced, such that these devices are capable of handling transients up to 8 kV Human Body Model (HBM).
The A1190, A1192 and A1193 are offered in a SOT-23W style, miniature low profile package (LH) for surface-mount applications. All devices are priced at $0.56 in quantities of 1,000.
New Hall Effect Current Sensor Up to 1,000 Amps for Renewable Energies
The continuous shortage on Hall Effect sensors in the market is generating big troubles on the industrial field and, of course, also in PV and wind inverters manufacturers.
In order to continue supporting our customers, Premo has successfully introduced a close loop 1,000 amp Hall Effect sensor mechanical and electrically equivalent to LEM LF-1005-S.
By means of close loop solution the high accuracy and linearity is guaranteed keeping values as low as 0.1 percent. The current sensor allows overload capabilities with a measuring range up to ± 2,000 amps.
The current sensor is designed in order to meet the highest safety requirements and is fully isolated with plastic housing, meeting isolation values higher than 6,000 VAC.
The product is completely sourced and produced in China and is currently available in 6 to 8 weeks. Samples and pilot orders from stock.
VPT Series Toroidal Power Transformers Offer Efficient Electronics Design Solution
Featuring up to 97.4 percent power efficiency and a highly efficient design using nearly 30 percent less material, the new VPT series toroidal power transformers from Triad Magnetics provide green power electronics solution.
Compared to conventional EI transformers, toroidal construction inherently helps reduce stray fields, increases efficiency and minimizes size. Triad's new transformers are constructed with a Class B, UL approved insulation system rated for 130°C that provides 4,000 V primary to secondary isolation.
The highly efficient VPT series is suitable for a wide range of applications in commercial and industrial equipment. The transformers operate over a broad power range from 25 VA to 2.5 KVA, depending on the specific model selected. With dual primary and secondary windings, it allows for maximum flexibility of input and output voltages. The VPT Series features an input voltage of 115/230 VAC, 50/60 Hz, and output voltage from 6.0 V through 230 V. Voltage regulation is up to 2.5 percent from full load to no load.
VPT series transformers are designed and manufactured under Triad’s ISO9001 quality assurance program. Thorough testing procedures assure that Triad products meet the most stringent global safety and environmental standards including UL, CE, RoHS and REACH. Agency files are available upon request.
The VPT series features a rugged, RoHS compliant toroidal construction in a package ranging in size from 71 to 208 mm diameter, a height range of 32 to 112 mm and weight range of 0.4 to 19.4 kg, depending on the specific model selected. The highest quality materials ensure improved performance and a long life.
VPT series transformers are simple to install out of the box, with mounting hardware included. Connections are 8 inch (200 mm) stranded UL 1015 lead wire with 0.25 inch (6 mm) stripped/tinned ends.
Depending on the model selected and the quantity ordered, the VPT series transformers are priced starting at $12.00 each in quantities of 100 units with delivery from stock to 8 weeks lead time.
TI Delivers Small Profibus RS-485 Transceiver with Integrated Driver for High Efficiency and Low EMI
Texas Instruments, Inc. (TI) has introduced an isolated half-duplex differential line transceiver with integrated transformer driver. The ISO1176T provides the primary voltage for an isolation transformer and, in conjunction with an external transformer, rectifier and regulator, provides the smallest isolated signal and power system design with high efficiency and low electromagnetic interference (EMI).
Applications include Profibus systems, factory and building automation, networked sensors, motor/motion control, HVAC and networked security stations. The ISO1176T is compatible with regulators like TI’s TPS76350, a low-dropout (LDO) voltage regulator that offers the benefits of low-power operation, and small package. These regulators feature low-dropout voltages and quiescent currents when compared to conventional LDO regulators, and is suitable for cost-sensitive designs and applications where board space is at a premium.
The ISO1176T is available now in a 16-pin SOIC package, with a suggested resale price of $3.30 in quantities of 1,000. Two other isolated full-duplex RS-485 transceivers with transformer drivers, one operating at 5 V and other operating at 3.3 V, will be available by end of 1Q11.
Fourier Systems Launches a New Axial and Radial Magnetic Field Sensor, Combining Dual Axis with Triple Range Data Collection
Fourier Systems, a pioneer in the science education technology industry, has announced the launch of its Dual Axis Magnetic sensor (DT036), which facilitates the easy measurement of magnetic field components, thus allowing students to directly experience and understand an otherwise intangible principle.
Because a magnetic field is a vector, it is extremely challenging to demonstrate this invisible and complex physical concept to students. Fourier's new magnetic sensor makes the unseen tangible and exemplifies Fourier's commitment to developing innovative science education technology tools.
The sensor's unique combination of dual axis measurement, together with three different ranges (±0.2 mT, ±40 mT, ±100 mT) opens the door to a world of fascinating magnetic field experiments, enhanced by superior resolution and unbeatable accuracy. The sensor is sensitive enough to capture the vertical and horizontal components of Earth's magnetic field, provides the accuracy required for the measurements of coils and features significant resolution to measure the magnetic field of solenoids.
“Fourier's new Dual Axis Magnetic sensor addresses the call from science teachers to deliver more advanced education technology sensors and this is our answer,” said Ken Zwiebel, CEO of Fourier Systems. “We are excited to introduce this sensor as one of several new products that will be introduced in 2011, including data loggers & sensors, as well as new versions of our MultiLab(TM) data analysis software.”
Murata Power Solutions Introduces Small Footprint Surface-Mount Inductors
The new 2200RM series of bobbin wound inductors from Murata Power Solutions provides a surface mount alternative to the company’s through-hole 2200R series. Suitable for use in a wide range of low to medium current applications, compact 2200RM inductors have a small footprint making them well suited for use in high density designs where a chip inductor is unable to cope with the power requirement.
The 2200RM series provides engineers with a wide choice of inductance values ranging from 10 µH to 68 mH and DC current ratings up to 2.52 A. Low DC resistance ratings enable a low voltage drop that helps reduce overall power consumption in customer designs. Custom value parts are also available if required.
The RoHS compliant 2200RM series is backward compatible with Sn/Pb soldering systems and have an operating temperature range of -40°C to 85°C With overall dimensions of 7.8 mm diameter by 7.5 mm high, parts are supplied in tape and reel packaging with 500 pieces per reel.
Wide-Band Current Monitor with High Output
A wide band current monitor with a high sensitivity of 1V/A, and improved high and low frequency response is being introduced by Ion Physics Corp.
The IPC Current Transformer model CM-100-6L measures AC and pulsed currents. By placing the monitor around the current carrying conductor it senses the magnetic field associated with the current and accurately measures the current. No physical contact to the current carrying conductor is required, eliminating ground loops and interference noise. The 3 dB bandwidth extends from 10 Hz to 30 MHz and the maximum allowable saturation value (Ipeak/frequency) is 0.15 As. The monitor has a maximum droop of 7%/ms and a usable risetime of 10 ns.
Electrostatically shielded, the IPC Current Monitor model CM-100-6L provides output voltage equal to the current times monitor sensitivity, which can be read on a voltmeter or oscilloscope. This device is doughnut shaped with an inner diameter of 1.6", an outer diameter of 4" and a thickness of 4.25". The selling price is $725.
McQuay Previews 700-Ton Daikin McQuay Magnitude
McQuay International previewed the new 700 ton Magnitude. Already known for its oil-free, magnetic bearing design, the new model is an extension to the company’s line of energy efficient chillers branded Magnitude. The chiller is well suited for use in universities, hospitals, manufacturing facilities and data centers.
With improved efficiency, sustainable performance and low sound levels, thousands of Magnitude chillers are installed around the world. They help owners reduce energy and operating costs, create a comfortable environment and meet requirements for sustainable design, such as Leadership in Energy and Environmental Design (LEED) certification criteria.
“The larger 700-ton units are a natural evolution of magnetic bearing compressor technology and makes the benefits of this technology available to a larger range of applications,” said Ray Good, director of chiller product management for McQuay. “This oil-free technology increases reliability and reduces maintenance because there are no conventional bearings and hence no oil management system and associated maintenance costs. In a typical chiller, oil builds up in the evaporator, reducing energy efficiency up to 15 percent. As a result of its higher sustainable operating efficiency and reduced maintenance, the Magnitude chiller delivers a lower cost of ownership compared to conventional centrifugal chillers.”
With its positive pressure, oil-free design, the ultra-efficient performance of the Magnitude chiller is sustainable through its operating life because there’s no oil to contaminate the refrigerant and degrade system efficiency.
By eliminating the high friction losses of conventional centrifugal compressors, the Magnitude chiller achieves exceptional full and part-load performance. Part-load IPLV for the 700-ton unit is as low as 0.306kW/ton, while maintaining world-class full load efficiency 0.532kW/ton.
For building owners who want to pursue LEED Green Building Certification, the Magnitude chiller can be part of practical and measureable green building design, construction, operation and maintenance solutions. Using R-134a refrigerant, the Magnitude chiller has no ozone depletion potential or phase-out schedule. The 400 to 700-ton Magnitude chiller earns two LEED points for Energy and Atmosphere Credit 4, Enhanced Refrigerant Management. In addition, its energy efficient performance may contribute to LEED Energy and Atmosphere Credit 1, Optimize Energy Efficiency, in which one to 19 points are possible.
The Magnitude chiller line has been tested and International Building Code (IBC) certified for seismic installations to remain online and functional after an event. For critical health facility buildings in California, Magnitude chillers have also received the more rigorous Office of Statewide Health Planning and Development (OSHPD) Special Seismic Certification Pre-approval. IBC and OSHPD certification pre-approvals save time and money on projects by reducing design time and speeding the commissioning process.