EPE Association: EPE 1987 - 01 - Lecture Session 1.01: SNUBBERS

EPE 1987 - 01 - Lecture Session 1.01: SNUBBERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 01 - Lecture Session 1.01: SNUBBERS

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   IMPROVED SNUBBER FOR GTO INVERTERS WITH ENERGY RECOVERY BY SIMPLE PASSIVE NETWORK
By Matthias Jung [View]
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Abstract: A new snubber configuration for application in choppers and inverters with GTO thyristors or power transistors has been developed. Each phase-leg of a voltage source PWM inverter is equipped with a snubber netwerk consisting of a single snubber capacitor, one storage capacitor, two auxiliary diodes and a single resistor. A substantial part of the snubber energy can be recovered by a secondary winding on the turn-on snubber inductance, reducing the total snubber losses to less than one third compared with a conventional RCD snubber.

   EXPERIMENTAL RESULTS ON THE INFLUENCE OF THE CAPACITY OF THE SNUBBER CAPACITOR ON THE SHAPE OF THE TAIL CURRENT OF A GTO-THYRISTOR
By Jürgen K. Steinke [View]
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Abstract: The design of turn-off snubber circuit is depending on circuit conditions. For a proper choice of the capacity of the snubber capacitor Cs two aspects are to be taken into account. The dv/dt limit during turn-off given in the data sheet determines the minimal capacity allowed. The maximal allowed average turn-off power loss may determine a higher value of Cs. This research shows, that the characteristlc values Itqt and Ttq of tall current curve are strongly lnfluenced by the capacity of Cs. The results are described in detail. A final view on turn-off power loss shall help the designer to choose a suitable capacity for the snubber capacitor in his application. By means of an example the dependence of turn-off loss energy on the capacity of Cs is pointed out.

   COMPUTER AIDED DESIGN OF PROTECTION NETWORKS FOR POWER SCR CHOPPERS
By A. Barili; A. Brambilla; E. Dallago; U. Mauri; R. Romano [View]
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Abstract: The work presents a design approach for SCR chopper protection networks based on circuit simulation techniques. The approach yields a design which takes into account mutual interactions between protection networks on different devices and effects due to saturable reactors and reverse-recovery charge mismatches in device arrays. The approach has found a satisfactory application on an industrial chopper.

   IMPROVED VOLTAGE SOURCE GTO INVERTER WITH NEW SNUBBER DESIGN
By B. Sneyers; Ph. Lataire; G. Maggetto; B. Detemmerman; J. M. Bodson [View]
[Download]

Abstract: Voltage source GTO inverter need snubber circuits for di/dt and dv/dt limitations. Snubber circuits are lossy and can be bulky. To improve the overall performances of the inverter it is important to control this aspect of the design. This paper presents a new lossless inverter branch design and compares it to other high efficiency voltage source inverter branch designs. Design considerations as well as experimental results are discussed in the case of an urban traction application.

EPE 1987 - 01 - Lecture Session 1.01: SNUBBERS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 01 - Lecture Session 1.01: SNUBBERS
	[return to parent folder]

	IMPROVED SNUBBER FOR GTO INVERTERS WITH ENERGY RECOVERY BY SIMPLE PASSIVE NETWORK By Matthias Jung	[View] [Download]
Abstract: A new snubber configuration for application in choppers and inverters with GTO thyristors or power transistors has been developed. Each phase-leg of a voltage source PWM inverter is equipped with a snubber netwerk consisting of a single snubber capacitor, one storage capacitor, two auxiliary diodes and a single resistor. A substantial part of the snubber energy can be recovered by a secondary winding on the turn-on snubber inductance, reducing the total snubber losses to less than one third compared with a conventional RCD snubber.

	EXPERIMENTAL RESULTS ON THE INFLUENCE OF THE CAPACITY OF THE SNUBBER CAPACITOR ON THE SHAPE OF THE TAIL CURRENT OF A GTO-THYRISTOR By Jürgen K. Steinke	[View] [Download]
Abstract: The design of turn-off snubber circuit is depending on circuit conditions. For a proper choice of the capacity of the snubber capacitor Cs two aspects are to be taken into account. The dv/dt limit during turn-off given in the data sheet determines the minimal capacity allowed. The maximal allowed average turn-off power loss may determine a higher value of Cs. This research shows, that the characteristlc values Itqt and Ttq of tall current curve are strongly lnfluenced by the capacity of Cs. The results are described in detail. A final view on turn-off power loss shall help the designer to choose a suitable capacity for the snubber capacitor in his application. By means of an example the dependence of turn-off loss energy on the capacity of Cs is pointed out.

	COMPUTER AIDED DESIGN OF PROTECTION NETWORKS FOR POWER SCR CHOPPERS By A. Barili; A. Brambilla; E. Dallago; U. Mauri; R. Romano	[View] [Download]
Abstract: The work presents a design approach for SCR chopper protection networks based on circuit simulation techniques. The approach yields a design which takes into account mutual interactions between protection networks on different devices and effects due to saturable reactors and reverse-recovery charge mismatches in device arrays. The approach has found a satisfactory application on an industrial chopper.

	IMPROVED VOLTAGE SOURCE GTO INVERTER WITH NEW SNUBBER DESIGN By B. Sneyers; Ph. Lataire; G. Maggetto; B. Detemmerman; J. M. Bodson	[View] [Download]
Abstract: Voltage source GTO inverter need snubber circuits for di/dt and dv/dt limitations. Snubber circuits are lossy and can be bulky. To improve the overall performances of the inverter it is important to control this aspect of the design. This paper presents a new lossless inverter branch design and compares it to other high efficiency voltage source inverter branch designs. Design considerations as well as experimental results are discussed in the case of an urban traction application.