EPE Association: EPE 2003 - Topic 08f: EMI & Over-Voltage Protection

EPE 2003 - Topic 08f: EMI & Over-Voltage Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08f: EMI & Over-Voltage Protection

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   AM compatible switch mode power supply for compact audio sets
By G. Sauerlaender, T. Duerbaum [View]
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Abstract: Until today, switch mode power supplies (SMPS) have failed to replace inefficient line transformers in compact audio sets incorporating AM tuners due to unacceptable interference especially in the AM band. This paper presents a new approach based on frequency hopping that for the first time allows to fully exploit the advantages of SMPS in these applications.

   Analysis and design of EMI filters for DC-DC converters using chain parameters
By K. Kostov; J. Kyyrä; T. Suntio [View]
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Abstract: Switch-mode power converters (SMPCs) are known as one of the greatest sources of electromagnetic interference (EMI) in electronic equipments. In order to comply with the strict electromagnetic compatibility (EMC) requirements, an EMI filter is needed at the input of a SMPC. The design of EMI filters aims at achieving required insertion loss (IL), i.e. attenuation of the power of the unwanted electromagnetic emissions (EME) from a switch-mode dc-dc converter. However, the EMI filter affects converter’s dynamics. This paper discusses how chain parameters can be used to calculate the IL provided by converter’s input filter and also in the input system stability analysis. The stability analysis shows that relatively small resistances in series with the capacitor and inductor, which are closest to SMPC’s input, can compensate the effect of converter’s negative input impedance. Chain parameters are very useful in IL calculations as well. Comparison between LC- and p-filter shows that if dc power line’s impedance is know to be very low, LC-filter will perform as p-filter. With unknown or high dc source impedance p-configuration should be used.

   Advanced IGBT control strategies - Improvement of the switching characteristics via active gate control
By H.P. Rothwangl; H. Schamböck [View]
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Abstract: This paper presents a new developed control circuit for the switching behaviour of IGBT modules. The control circuit includes boosted active du/dt - control to reduce the voltage gradient and boosted active clamp-control to limit the over voltage at turn-off. Unlike common methods, the circuit design allows to set the breakdown voltage of the zenerdiodes below the maximum possible voltage of the intermediate d.c. link of the electronic power converter. Tests with various Eupec modules (1700V, 3300V) have been carried out with satisfying results.

   Comparison of conducted RF-emissions between PID and sliding mode controlled DC-DC converter
By M. Kuisma; M. Ahmed; P. Silventoinen [View]
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Abstract: Traditional pulse width modulated (PWM) power converter operates on a constant switching frequency. This frequency is also presented in the electromagnetic interference (EMI) -spectrum of the converter. During the last decade, intensive study of EMI-reduction techniques, including spread spectrum technology, in the field of power electronics has been made. Selected control strategy also effects on the generated EMI spectrum. In this paper, a comparison between EMI-noise effects of fixed frequency, PID-controlled PWM and sliding mode –controlled (SMC) converter has been done. Both simulation and experimental results are presented.

EPE 2003 - Topic 08f: EMI & Over-Voltage Protection
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08f: EMI & Over-Voltage Protection
	[return to parent folder]

	AM compatible switch mode power supply for compact audio sets By G. Sauerlaender, T. Duerbaum	[View] [Download]
Abstract: Until today, switch mode power supplies (SMPS) have failed to replace inefficient line transformers in compact audio sets incorporating AM tuners due to unacceptable interference especially in the AM band. This paper presents a new approach based on frequency hopping that for the first time allows to fully exploit the advantages of SMPS in these applications.

	Analysis and design of EMI filters for DC-DC converters using chain parameters By K. Kostov; J. Kyyrä; T. Suntio	[View] [Download]
Abstract: Switch-mode power converters (SMPCs) are known as one of the greatest sources of electromagnetic interference (EMI) in electronic equipments. In order to comply with the strict electromagnetic compatibility (EMC) requirements, an EMI filter is needed at the input of a SMPC. The design of EMI filters aims at achieving required insertion loss (IL), i.e. attenuation of the power of the unwanted electromagnetic emissions (EME) from a switch-mode dc-dc converter. However, the EMI filter affects converter’s dynamics. This paper discusses how chain parameters can be used to calculate the IL provided by converter’s input filter and also in the input system stability analysis. The stability analysis shows that relatively small resistances in series with the capacitor and inductor, which are closest to SMPC’s input, can compensate the effect of converter’s negative input impedance. Chain parameters are very useful in IL calculations as well. Comparison between LC- and p-filter shows that if dc power line’s impedance is know to be very low, LC-filter will perform as p-filter. With unknown or high dc source impedance p-configuration should be used.

	Advanced IGBT control strategies - Improvement of the switching characteristics via active gate control By H.P. Rothwangl; H. Schamböck	[View] [Download]
Abstract: This paper presents a new developed control circuit for the switching behaviour of IGBT modules. The control circuit includes boosted active du/dt - control to reduce the voltage gradient and boosted active clamp-control to limit the over voltage at turn-off. Unlike common methods, the circuit design allows to set the breakdown voltage of the zenerdiodes below the maximum possible voltage of the intermediate d.c. link of the electronic power converter. Tests with various Eupec modules (1700V, 3300V) have been carried out with satisfying results.

	Comparison of conducted RF-emissions between PID and sliding mode controlled DC-DC converter By M. Kuisma; M. Ahmed; P. Silventoinen	[View] [Download]
Abstract: Traditional pulse width modulated (PWM) power converter operates on a constant switching frequency. This frequency is also presented in the electromagnetic interference (EMI) -spectrum of the converter. During the last decade, intensive study of EMI-reduction techniques, including spread spectrum technology, in the field of power electronics has been made. Selected control strategy also effects on the generated EMI spectrum. In this paper, a comparison between EMI-noise effects of fixed frequency, PID-controlled PWM and sliding mode –controlled (SMC) converter has been done. Both simulation and experimental results are presented.