Abstract
A novel powering scheme based on the DC-DC conversion technique will be exploited to power the CMS Phase-1 pixel detector. DC-DC buck converters for the CMS pixel project have been developed, based on the AMIS5 ASIC designed by CERN. The powering system of the Phase-1 pixel detector is described and the performance of the converter prototypes is detailed, including power efficiency, stability of the output voltage, shielding, and thermal management. Results from a test of the magnetic field tolerance of the DC-DC converters are reported. System tests with pixel modules using many components of the future pixel barrel system are summarized. Finally first impressions from a pre-series of 200 DC-DC converters are presented.
Highlights
DC-DC buck convertersStep-down DC-DC converters allow the power, P = V · I, to be delivered at a higher voltage, V , but with lower current, I: P = (rV ) · (I/r)
Layers, and from the current two disks per side to three disks per side
DC-DC buck converters for the CMS pixel project have been developed, based on the AMIS5 ASIC designed by CERN
Summary
Step-down DC-DC converters allow the power, P = V · I, to be delivered at a higher voltage, V , but with lower current, I: P = (rV ) · (I/r). Cable losses on the input side of the DC-DC converter are thereby reduced by a factor r2. The overall period, T , is linked to the switching frequency, fs, as T = 1/ fs. In this way the load is periodically connected to and disconnected from the power supply. An inductor with inductance L acts as energy buffer, allowing a direct current to be supplied to the load. Lossless DC-DC converter, the conversion ratio is linked to the duty cycle, D = ton/T , as r = 1/D
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