EPE Association: EPE 2007 - Subtopic 08-1 - LS: Measurements and Sensors

EPE 2007 - Subtopic 08-1 - LS: Measurements and Sensors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 08: 'Measurements and sensors (except speed and position sensors)' > EPE 2007 - Subtopic 08-1 - LS: Measurements and Sensors

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   Analysis and Calibration of a High Precision AD Converter
By Martin Emmenegger; Felix Jenni; RenÃ© KÃ¼nzi; Hans Jaeckle; Steffen Schnabel [View]
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Abstract: The accuracy of AD converters can be improved by error correction. The presented ADC analyzer and calibrator, based on a histogram test with small triangular input signals, determines the static errors like gain, offset and linearity. The advantages of the principle are fast results with a high level of confidence and small experimental burden.

   Evaluation of the Iron Loss of an Inductor Based on Dynamic Minor Characteristics
By Kazuhito Terashima; Keiji Wada; Toshihisa Shimizu; Tomoyuki Nakazawa, Kenichiro Ishii; Yusuke Hayashi [View]
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Abstract: This paper discusses the iron loss characteristics of magnetic materials used in the chopper circuits of pulse width modulation (PWM) inverter circuits. A distinctive feature of this method, previously reported by the authors, is that the iron loss map is created by measuring the dynamic minor loop traced on the B-H plane, and it can be a useful method for calculation of the inductor iron loss in a dc chopper circuit as well as a PWM inverter circuit. In order to encourage the wide use of this method in the design of the power converters, this paper provides the characterization of loss map data in several magnetic materials, such as an iron-powder core, an amorphous core and a silicon-steel core. In addition to the loss caused by the hysteresis phenomenon, the loss caused by eddy current phenomena is discussed. Influenced by the eddy current loss, the shape of the dynamic minor loop tends to be rhombic when the inductors are magnetized using a pulse voltage, whereas the shape is oval when they are magnetized using a sinusoidal voltage. The increase in the amount of loss caused by the eddy current in each of these magnetic materials is also discussed.

   Parameter Estimation of a DC/DC Buck Converter Using a Continuous Time Model
By Gustavo Malagoni Buiatti; Acacio Manuel Raposo Amaral; Antonio JoÃ£o Marques Cardoso [View]
[Download]

Abstract: In this paper, a novel online technique for estimating the parameters of a DC/DC Buck converter through a continuous time model is proposed. Standard least mean squares algorithm is applied among other formulations, taking into account only the non conduction state during a single switching cycle. The problem of derivative calculation of the needed voltage and current signals is solved by polynomial interpolation.

EPE 2007 - Subtopic 08-1 - LS: Measurements and Sensors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 08: 'Measurements and sensors (except speed and position sensors)' > EPE 2007 - Subtopic 08-1 - LS: Measurements and Sensors
	[return to parent folder]

	Analysis and Calibration of a High Precision AD Converter By Martin Emmenegger; Felix Jenni; RenÃ© KÃ¼nzi; Hans Jaeckle; Steffen Schnabel	[View] [Download]
Abstract: The accuracy of AD converters can be improved by error correction. The presented ADC analyzer and calibrator, based on a histogram test with small triangular input signals, determines the static errors like gain, offset and linearity. The advantages of the principle are fast results with a high level of confidence and small experimental burden.

	Evaluation of the Iron Loss of an Inductor Based on Dynamic Minor Characteristics By Kazuhito Terashima; Keiji Wada; Toshihisa Shimizu; Tomoyuki Nakazawa, Kenichiro Ishii; Yusuke Hayashi	[View] [Download]
Abstract: This paper discusses the iron loss characteristics of magnetic materials used in the chopper circuits of pulse width modulation (PWM) inverter circuits. A distinctive feature of this method, previously reported by the authors, is that the iron loss map is created by measuring the dynamic minor loop traced on the B-H plane, and it can be a useful method for calculation of the inductor iron loss in a dc chopper circuit as well as a PWM inverter circuit. In order to encourage the wide use of this method in the design of the power converters, this paper provides the characterization of loss map data in several magnetic materials, such as an iron-powder core, an amorphous core and a silicon-steel core. In addition to the loss caused by the hysteresis phenomenon, the loss caused by eddy current phenomena is discussed. Influenced by the eddy current loss, the shape of the dynamic minor loop tends to be rhombic when the inductors are magnetized using a pulse voltage, whereas the shape is oval when they are magnetized using a sinusoidal voltage. The increase in the amount of loss caused by the eddy current in each of these magnetic materials is also discussed.

	Parameter Estimation of a DC/DC Buck Converter Using a Continuous Time Model By Gustavo Malagoni Buiatti; Acacio Manuel Raposo Amaral; Antonio JoÃ£o Marques Cardoso	[View] [Download]
Abstract: In this paper, a novel online technique for estimating the parameters of a DC/DC Buck converter through a continuous time model is proposed. Standard least mean squares algorithm is applied among other formulations, taking into account only the non conduction state during a single switching cycle. The problem of derivative calculation of the needed voltage and current signals is solved by polynomial interpolation.