EPE Association: EPE 2011 - LS6f: Topic 08: Sensors and Transducers, Measurements Methods and Techniques

EPE 2011 - LS6f: Topic 08: Sensors and Transducers, Measurements Methods and Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 08: Measurements and Sensors > EPE 2011 - LS6f: Topic 08: Sensors and Transducers, Measurements Methods and Techniques

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   Analog-to-Digital Converter for Input Voltage Measurement in Low-Power Digitally Controlled Switch-Mode Power Supply Converters
By Aleksandar RADIC, S M AHSANUZZAMAN, Amir PARAYANDEH, Aleksandar PRODIC [View]
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Abstract: This paper introduces a practical analog-to-digital (ADC) converter architecture for the input voltage measurements in low-power digitally controlled switch-mode power supplies (SMPS). The ADC utilizes known reference voltage and a duty ratio of a simple circuit mimicking operation of the converter to obtain the information about the input voltage value. The functionality of the ADC is verified through a discrete implementation, with a 1.5 V/3 W buck converter based experimental prototype. A better than 1.5\% accuracy is observed over the entire 1.8 V to 3.3 V input voltage range. A small silicon size of about 0.025mm2 is also estimated, based on the synthesized digital logic and already existing on-chip integrated system functional blocks.

   New evaluation of low frequency capture for a wide bandwidth clamping current probe for +/- 800 A using GMR sensors
By Boris HUDOFFSKY, Jörg ROTH-STIELOW [View]
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Abstract: Magnetic field sensitive semiconductors used for current measurement work well, but do have restrictions. Offset, sensitivity, linearity, temperature drift and measuring range are often critical properties of a current probe, especially if it is realised with magnetic field sensors like Hall effect and any kind of ferromagnetic flux concentrator. This paper is focused on the working principle of a new evaluation method for a DC to low frequency current measurement device, utilizing magnetic field sensitive semiconductors, which is designed to be part of a wide bandwidth clamping current probe. Distinctive to this new method is, that an external compensation coil surrounds the sensing semiconductor and no ferromagnetic core is needed. The presented measurement method is extendable to a very wide range of current amplitudes. A clamping sensor head for a current probe has been built, assembling an array of GMR (giant magneto resistance) sensors driven and evaluated with this method. The performance of this prototype for ±800 A is presented.

   Numerical Simulation and Experimental Validation of a Transmission Line Fault Location and Identification Method in the presence of Noise
By Caroline HEALY, Richard GUINEE [View]
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Abstract: This paper exhibits a novel pulse tester correlation strategy through numerical simulation and key experimental findings undertaken in a laboratory controlled environment for test concept validation. This test strategy incorporates the deployment of a Pseudorandom Binary Sequence (PRBS) also known as a pseudo noise (pN) excitation as a viable competitive alternative to traditional Time Domain Reflectometry (TDR) in transmission line fault identification and location. The system identification technique resides in the unique characteristic signature produced as a consequence of the Cross Correlation (CCR) of both the induced fault echo response and PRBS test input stimulus. The distinctive manifestation of the delayed CCR profile signature also facilitates the attainment of an accurate fault location once prior knowledge of the velocity of propagation of the signal over the transmission link has been established. The PRBS possesses a wideband power spectrum which in essence is considered to be white noise like in nature which allows system identification of the transmission link. This feature allows the Cross Correlation process to be undertaken over numerous cycles at low amplitudes in the presence of normal online signal traffic and indigenous noise present. Significant results are presented in this paper to demonstrate the effectiveness of the multiple PRBS cycle correlation in transmission link noise rejection. Results clearly show noise reduction as the correlation cycle number increases which ensures that fault resolution and identification is achieved. An approximate theoretical model of the PRBS fault identification extraction process for a mismatched cable termination is also presented to verify the PRBS test technique.

EPE 2011 - LS6f: Topic 08: Sensors and Transducers, Measurements Methods and Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 08: Measurements and Sensors > EPE 2011 - LS6f: Topic 08: Sensors and Transducers, Measurements Methods and Techniques
	[return to parent folder]

	Analog-to-Digital Converter for Input Voltage Measurement in Low-Power Digitally Controlled Switch-Mode Power Supply Converters By Aleksandar RADIC, S M AHSANUZZAMAN, Amir PARAYANDEH, Aleksandar PRODIC	[View] [Download]
Abstract: This paper introduces a practical analog-to-digital (ADC) converter architecture for the input voltage measurements in low-power digitally controlled switch-mode power supplies (SMPS). The ADC utilizes known reference voltage and a duty ratio of a simple circuit mimicking operation of the converter to obtain the information about the input voltage value. The functionality of the ADC is verified through a discrete implementation, with a 1.5 V/3 W buck converter based experimental prototype. A better than 1.5\% accuracy is observed over the entire 1.8 V to 3.3 V input voltage range. A small silicon size of about 0.025mm2 is also estimated, based on the synthesized digital logic and already existing on-chip integrated system functional blocks.

	New evaluation of low frequency capture for a wide bandwidth clamping current probe for +/- 800 A using GMR sensors By Boris HUDOFFSKY, Jörg ROTH-STIELOW	[View] [Download]
Abstract: Magnetic field sensitive semiconductors used for current measurement work well, but do have restrictions. Offset, sensitivity, linearity, temperature drift and measuring range are often critical properties of a current probe, especially if it is realised with magnetic field sensors like Hall effect and any kind of ferromagnetic flux concentrator. This paper is focused on the working principle of a new evaluation method for a DC to low frequency current measurement device, utilizing magnetic field sensitive semiconductors, which is designed to be part of a wide bandwidth clamping current probe. Distinctive to this new method is, that an external compensation coil surrounds the sensing semiconductor and no ferromagnetic core is needed. The presented measurement method is extendable to a very wide range of current amplitudes. A clamping sensor head for a current probe has been built, assembling an array of GMR (giant magneto resistance) sensors driven and evaluated with this method. The performance of this prototype for ±800 A is presented.

	Numerical Simulation and Experimental Validation of a Transmission Line Fault Location and Identification Method in the presence of Noise By Caroline HEALY, Richard GUINEE	[View] [Download]
Abstract: This paper exhibits a novel pulse tester correlation strategy through numerical simulation and key experimental findings undertaken in a laboratory controlled environment for test concept validation. This test strategy incorporates the deployment of a Pseudorandom Binary Sequence (PRBS) also known as a pseudo noise (pN) excitation as a viable competitive alternative to traditional Time Domain Reflectometry (TDR) in transmission line fault identification and location. The system identification technique resides in the unique characteristic signature produced as a consequence of the Cross Correlation (CCR) of both the induced fault echo response and PRBS test input stimulus. The distinctive manifestation of the delayed CCR profile signature also facilitates the attainment of an accurate fault location once prior knowledge of the velocity of propagation of the signal over the transmission link has been established. The PRBS possesses a wideband power spectrum which in essence is considered to be white noise like in nature which allows system identification of the transmission link. This feature allows the Cross Correlation process to be undertaken over numerous cycles at low amplitudes in the presence of normal online signal traffic and indigenous noise present. Significant results are presented in this paper to demonstrate the effectiveness of the multiple PRBS cycle correlation in transmission link noise rejection. Results clearly show noise reduction as the correlation cycle number increases which ensures that fault resolution and identification is achieved. An approximate theoretical model of the PRBS fault identification extraction process for a mismatched cable termination is also presented to verify the PRBS test technique.