Abstract
The standard solution for powering the electronics of particle physics detectors is to supply direct current. In thisreport, we investigate several advantages of using a Pulsed Poweringscheme. Pulsed Powering could achieve 2-wire, point-of-load voltageregulation over typical low voltage power cables. This could be areliable and serviceable solution for point of load voltage regulationin the high radiation environment of the High Luminosity Large HadronCollider. Pulsed Powering might also be exploited to provide aninexpensive solution for the elimination of voltage offsets amongATLAS Pixel Detector subsystems and offer new low mass techniques fordistributing power to particle detectors.
Highlights
Amplitude (V) Cable voltage out / Cable voltage in Measured voltages for the test cable and a 2 Ohm load at 6Khz
The final subsection 2.3 describes a specific application of Pulsed Powering, which is to achieve electrical isolation between ATLAS Pixel Detector module frontend electronics power supply channels without the need to rewrite any of the existing power supply control or monitoring code
The design of regulation systems must protect against a short circuit from the input to the output of the regulator in order to avoid the application of damaging voltages across the front-end electronics
Summary
Pulsed Powering is defined as a train of voltage pulses delivered over a power distribution system that allows dc current to flow, as well. The dc value into the input of the power distribution system, is the average value of a pulse train This allows the system designer to exploit the ac characteristics of the system, including the cable. The pulse integration takes place at the load at the end of the cable, i.e., at a module’s front-end electronics without need of a rectifier. The signal at both ends of a typical power cable is shown, which demonstrates one type of Pulsed Powering signal, a half-wave rectified sine wave. The capability to read the integrated dc value across the load from the input, between pulses, gives rise to the idea described in subsection 2.1, remote point of load regulation and power delivery over two wires. One can determine that a break in the sense circuit would cause the regulator output voltage to rise to the value at its input, possibly damaging sensitive front-end electronics at the load. (b) The test setup for a 100 m sample of ATLAS Pixel digital power, including the time response of the sample
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