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EDNE DEC 2014

pulse Vicor extends “component power” concepts with VIA package Vicor has said it will formally introduce its first product in its VIA – Vicor Integrated Adaptor – package by the end of 2014, for availability in early 2015. The package extends Vicor’s component power concepts and will initially be used for front-end modules. The VIA package is superficially not unlike a traditional “brick” format, a module for direct mounting to a heatsink or cold wall. Vicor intends to use it to house input modules for its component-power architecture; the first product is likely to be a 400W, AC/DC input block. VIA modules will be a standard width and profile of 35.3 mm and 9.3 mm respectively, and will vary in length from 72 to 141 mm. The machined metal housing encloses and provides distribution for one of Vicor’s ChiP units, plus other circuitry. The ChiP is a recent introduction that hosts a variety of power conversion functions built in an almost totally-automated process. Multiple instances of converters are assembled together on a single large panel, with structural features such as in-board magnetic components that, in the final form, present thermallyconducting faces to both top and bottom of the package. ChiP panels are over-moulded and then sawn – in a similar fashion to a scaled-up silicon wafer – into individual blocks. When used discretely, Vicor adds pins or terminations to the device’s connections – that are exposed on the sawn edges – to allow conventional connections to be made. With appropriate heatsinking to top and bottom of a ChiP package, Vicor quotes over 1 kW 16-bit, high-resolution oscilloscopes from Rohde & Schwarz A 16-bit, high definition (HD) mode increases the vertical resolution of the R&S RTO and RTE oscilloscopes to up to 16 bits, for waveforms that are sharper and show signal details that would otherwise be masked by noise. Users benefit from even more precise analysis results. The increased resolution is achieved by signal processing, using the same A/D converter already in use, with the trade-off of reduced bandwidth while the HD mode is engaged. To be able to analyse waveforms in detail, the input sensitivity of the oscilloscopes has been increased to 500 μV/div. To achieve the higher resolution, the signal is low-pass filtered directly after the A/D converter. The filter reduces the noise, thereby increasing the signal-to-noise ratio. Users can adjust the bandwidth of the lowpass filter from 10 kHz to 500 MHz as needed to match the per cubic inch power density for a bus-converter (fixed-ratio DC/DC) module. The company acknowledges that “ultimate” (top and bottom contact, low thermal resistance) heatsinking is not always easy to achieve, which is partly the rationale behind the VIA package. The VIA houses a ChiP module with sufficient space at either end for additional PCB-mounted functions such as EMI filtering, transient protection, or digital bus control/reporting. In the VIA package, the ChiP modules are used without their added pins/ surface-mount terminals, direct connections being made to the edge contacts exposed when they are “sawn”. A machined metal housing surrounds the ChiP block, and provides a good thermal path from its top, as well as bottom, surface, to the Complete article, here base plate. characteristics of the applied signal. Typical applications include examining in detail low-voltage components on a signal that also exhibits high-voltage components; one example is the characterisation of switch mode power supplies. The voltages across the switching device must be determined during the off and on times within the same acquisition. Because the voltage variations during these switching cycles can be several hundred volts, a high resolution is essential for the precise measurement of small voltage components. Switching on the high definition mode does not compromise measurement speed or functions. Since the digital filtering, which improves resolution and noise suppression, is implemented in realtime in the oscilloscope’s ASIC, the acquisition and processing rates remain high. Complete article, here 8 EDN Europe | DECEMBER 2014 www.edn-europe.com


EDNE DEC 2014
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