EPE Association: EPE 2020 - LS6c: Measurements Techniques, Drives, Sensors and State Observers

EPE 2020 - LS6c: Measurements Techniques, Drives, Sensors and State Observers
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 03: Measurement and Control > EPE 2020 - LS6c: Measurements Techniques, Drives, Sensors and State Observers

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   Compensation of Temperature Dependence in a Module Parasitic Based Current Measurement System
By Frank LAUTNER [View]
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Abstract: This paper presents a current sensing method, which evaluates the voltage across the parasitic resistance and inductance in power modules. Such a sensing method requires an appropriate low pass filter to achieve a signal that is proportional to the current to be measured. In inverter operation, however, the parasitic resistance in the measurement section is variable due to its temperature dependence. This requires firstly a temperature estimation for the measurement section in the semiconductor module and a correction of the deviations arising from that circumstance. At a first glance, three different possible temperature estimation methods seem possible. The first approach by using an additional temperature sensor is only considered as a trivial solution and not examined further. Its disadvantage is the additional component, which is then necessary for current measurement. The second and third method are investigated in detail, which is on the one hand the use of mostly present negative-temperature-coefficient (NTC) thermistors in the module and on the other hand, a completely new approach that exploits the temperature dependence of the sensed signal waveform. Both approaches were tested in inverter operation. They improve current sensing errors by means of module parasitics from ± 25 \% to ±2…5 \%.

   High Sensitivity Current Transformer with low Settling Time, for Magnified AC Current Measurements in Pulsed Current Applications
By Georgios TSOLARIDIS [View]
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Abstract: In solid-state pulsed power systems based on switching converters often a low amplitude, high frequency ripple current is superimposed on the high flat-top pulse current. Despite its low amplitude (usually measured in ppm) the ripple current could have a major impact on the performance of the system and therefore needs to be quantified/reduced. However, measuring such currents is challenging, due to the limited resolution of the current probe, especially when the DC offset current of the pulse is in the kA range. Therefore a suitable AC current probe able to perform magnified ripple current measurements with high fidelity is proposed in this paper. The probe is based on the principle of current transformers and filters the DC offset of the pulsed current, enabling to measure the ripple with a very high resolution. The design trade-offs of the conventional CT for such an application are explained, and an adaptive burden resistance topology is proposed in order to achieve simultaneously a low settling time, which is essential for measuring short pulses, and the needed high sensitivity, while maintaining a relatively high bandwidth.

   Stray Voltage Capture for Robust and Ultra-Fast Short Circuit Detection in Power Electronics with Half-Bridge Structure: the Limitation and Implementation
By Darian RETIANZA [View]
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Abstract: This paper proposes a robust and ultra-fast short circuit detection method based on the voltage dip on the half-bridge due to the presence of stray inductance. Results show that the short circuit is detected in less than 200ns, which is a promising solution against the Single-Event Burnout failure type occurrence.

   Wide Bandwidth Current Sensor for Commutation Current Measurement in Fast Switching Power Electronics
By Philipp ZIEGLER [View]
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Abstract: This paper presents a current sensor for commutation current measurement with a bandwidth from DCup to 315 MHz. The sensor is inserted in the commutation loop by a coaxial housing with a low insertioninductance of about 1.2 nH. The sensor is based on the HOKA principle using tunnel magnetoresistancesensors and a Rogowski-coil for low and high frequency current measurement respectively. The currentsensor is tested in a half-bridge configuration equipped with gallium nitride transistors and compared totwo state-of-the-art current sensors.

EPE 2020 - LS6c: Measurements Techniques, Drives, Sensors and State Observers
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 03: Measurement and Control > EPE 2020 - LS6c: Measurements Techniques, Drives, Sensors and State Observers
	[return to parent folder]

	Compensation of Temperature Dependence in a Module Parasitic Based Current Measurement System By Frank LAUTNER	[View] [Download]
Abstract: This paper presents a current sensing method, which evaluates the voltage across the parasitic resistance and inductance in power modules. Such a sensing method requires an appropriate low pass filter to achieve a signal that is proportional to the current to be measured. In inverter operation, however, the parasitic resistance in the measurement section is variable due to its temperature dependence. This requires firstly a temperature estimation for the measurement section in the semiconductor module and a correction of the deviations arising from that circumstance. At a first glance, three different possible temperature estimation methods seem possible. The first approach by using an additional temperature sensor is only considered as a trivial solution and not examined further. Its disadvantage is the additional component, which is then necessary for current measurement. The second and third method are investigated in detail, which is on the one hand the use of mostly present negative-temperature-coefficient (NTC) thermistors in the module and on the other hand, a completely new approach that exploits the temperature dependence of the sensed signal waveform. Both approaches were tested in inverter operation. They improve current sensing errors by means of module parasitics from ± 25 \% to ±2…5 \%.

	High Sensitivity Current Transformer with low Settling Time, for Magnified AC Current Measurements in Pulsed Current Applications By Georgios TSOLARIDIS	[View] [Download]
Abstract: In solid-state pulsed power systems based on switching converters often a low amplitude, high frequency ripple current is superimposed on the high flat-top pulse current. Despite its low amplitude (usually measured in ppm) the ripple current could have a major impact on the performance of the system and therefore needs to be quantified/reduced. However, measuring such currents is challenging, due to the limited resolution of the current probe, especially when the DC offset current of the pulse is in the kA range. Therefore a suitable AC current probe able to perform magnified ripple current measurements with high fidelity is proposed in this paper. The probe is based on the principle of current transformers and filters the DC offset of the pulsed current, enabling to measure the ripple with a very high resolution. The design trade-offs of the conventional CT for such an application are explained, and an adaptive burden resistance topology is proposed in order to achieve simultaneously a low settling time, which is essential for measuring short pulses, and the needed high sensitivity, while maintaining a relatively high bandwidth.

	Stray Voltage Capture for Robust and Ultra-Fast Short Circuit Detection in Power Electronics with Half-Bridge Structure: the Limitation and Implementation By Darian RETIANZA	[View] [Download]
Abstract: This paper proposes a robust and ultra-fast short circuit detection method based on the voltage dip on the half-bridge due to the presence of stray inductance. Results show that the short circuit is detected in less than 200ns, which is a promising solution against the Single-Event Burnout failure type occurrence.

	Wide Bandwidth Current Sensor for Commutation Current Measurement in Fast Switching Power Electronics By Philipp ZIEGLER	[View] [Download]
Abstract: This paper presents a current sensor for commutation current measurement with a bandwidth from DCup to 315 MHz. The sensor is inserted in the commutation loop by a coaxial housing with a low insertioninductance of about 1.2 nH. The sensor is based on the HOKA principle using tunnel magnetoresistancesensors and a Rogowski-coil for low and high frequency current measurement respectively. The currentsensor is tested in a half-bridge configuration equipped with gallium nitride transistors and compared totwo state-of-the-art current sensors.