EPE Association: EPE 2015 - LS5d: Measurements Techniques and Sensors

EPE 2015 - LS5d: Measurements Techniques and Sensors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS5d: Measurements Techniques and Sensors

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   Comparison of UCE- and RGi-based Junction Temperature Measurement of Multichip IGBT Power Modules
By Marco DENK [View]
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Abstract: The internal gate resistor RGi of an IGBT power module is the most promising temperature sensitive electrical parameter for real-time junction temperature measurement in a working voltage source inverter. This paper investigates RGi-based junction temperature measurement and compares it with the widespread UCE-method that is used for device characterization in laboratory setups. It is found that both methods have similar averaging properties when measuring the junction temperature of paralleled IGBT single chips. However, in case of a centered internal gate resistor the RGi-method measures a higher temperature than the area-averaging UCE-method. Especially at steep lateral temperature profiles the RGi-measured temperature is closer to the chip peak temperature than the UCE-measured one. This deviation is investigated in thermal equilibrium and during the cooling down process using thermal impedance measurement, an IR-camera and a finite element simulation.

   High precision optical Current Measurement System based on the Faraday-Effect with a large Bandwidth
By Dominic GERBER [View]
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Abstract: In this paper, a high dynamic, high precision optical current measurement system based on the Faraday-effectis presented. First, the sensor concept is explained and different sensor constructions are analyzed. Then, animplementation of the concept based on a rare-earth iron garnet film is investigated. This measurement system usesmultiple signal processing channels to increase the signal-to-noise ratio. Furthermore, the range of the rotation ofthe polarization plane exceeds 90° and therefore requires a counting mechanism to count the number of rotations.Finally, the precision of the presented system is analyzed. The precision is determined to be 4.9 ppm for a rotationrange of 3300°.

   On-state voltage drop based power limit detection of IGBT inverters
By Ionut TRINTIS [View]
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Abstract: Power density is a key performance factor in order to reduce the cost and size of a power converter.Because of the unknown junction temperature, today's design margins are relatively high to ensure safeand a reliable operation. In this paper, the on-state voltage drop is measured online for all insulated gatebipolar transistors (IGBTs) in the inverter, using advanced gate driver. The die temperature is estimatedand monitored on each device during power converter operation. Based on the monitored temperaturein real time, the maximum power capability is detected. The output power is increased until a safe operatingtemperature of power modules. This enable a power density is increased by 11.16 kW/litre to19.13 kW/litre in a low voltage power stack which is typically used in wind power converters. Experimentresults are shown for safe operation of converter at around 1.2 MW, which is built in a standardsize for the 600 - 700 kW. Furthermore, the 1700 V, 1000 A power module is replaced with a 1400 Amodule to increase the load current.

   Pulse Generator for Dynamic Performance Verification of Current Transducers
By Jan GOTTSCHLICH [View]
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Abstract: In this paper a compact low-cost current-pulse generator circuit is presented. This circuit is used to provide a reference current for the evaluation of the dynamic performance of current transducers. It is able to generate short current pulses with fast rise times of up to 1 kA/µs and variable amplitudes of up to 100 A. The functionality is demonstrated by example measurements of different current transducers.

EPE 2015 - LS5d: Measurements Techniques and Sensors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS5d: Measurements Techniques and Sensors
	[return to parent folder]

	Comparison of UCE- and RGi-based Junction Temperature Measurement of Multichip IGBT Power Modules By Marco DENK	[View] [Download]
Abstract: The internal gate resistor RGi of an IGBT power module is the most promising temperature sensitive electrical parameter for real-time junction temperature measurement in a working voltage source inverter. This paper investigates RGi-based junction temperature measurement and compares it with the widespread UCE-method that is used for device characterization in laboratory setups. It is found that both methods have similar averaging properties when measuring the junction temperature of paralleled IGBT single chips. However, in case of a centered internal gate resistor the RGi-method measures a higher temperature than the area-averaging UCE-method. Especially at steep lateral temperature profiles the RGi-measured temperature is closer to the chip peak temperature than the UCE-measured one. This deviation is investigated in thermal equilibrium and during the cooling down process using thermal impedance measurement, an IR-camera and a finite element simulation.

	High precision optical Current Measurement System based on the Faraday-Effect with a large Bandwidth By Dominic GERBER	[View] [Download]
Abstract: In this paper, a high dynamic, high precision optical current measurement system based on the Faraday-effectis presented. First, the sensor concept is explained and different sensor constructions are analyzed. Then, animplementation of the concept based on a rare-earth iron garnet film is investigated. This measurement system usesmultiple signal processing channels to increase the signal-to-noise ratio. Furthermore, the range of the rotation ofthe polarization plane exceeds 90° and therefore requires a counting mechanism to count the number of rotations.Finally, the precision of the presented system is analyzed. The precision is determined to be 4.9 ppm for a rotationrange of 3300°.

	On-state voltage drop based power limit detection of IGBT inverters By Ionut TRINTIS	[View] [Download]
Abstract: Power density is a key performance factor in order to reduce the cost and size of a power converter.Because of the unknown junction temperature, today's design margins are relatively high to ensure safeand a reliable operation. In this paper, the on-state voltage drop is measured online for all insulated gatebipolar transistors (IGBTs) in the inverter, using advanced gate driver. The die temperature is estimatedand monitored on each device during power converter operation. Based on the monitored temperaturein real time, the maximum power capability is detected. The output power is increased until a safe operatingtemperature of power modules. This enable a power density is increased by 11.16 kW/litre to19.13 kW/litre in a low voltage power stack which is typically used in wind power converters. Experimentresults are shown for safe operation of converter at around 1.2 MW, which is built in a standardsize for the 600 - 700 kW. Furthermore, the 1700 V, 1000 A power module is replaced with a 1400 Amodule to increase the load current.

	Pulse Generator for Dynamic Performance Verification of Current Transducers By Jan GOTTSCHLICH	[View] [Download]
Abstract: In this paper a compact low-cost current-pulse generator circuit is presented. This circuit is used to provide a reference current for the evaluation of the dynamic performance of current transducers. It is able to generate short current pulses with fast rise times of up to 1 kA/µs and variable amplitudes of up to 100 A. The functionality is demonstrated by example measurements of different current transducers.