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This paper describes two basic approaches to calculate the small signal behavior of the resonant LLC-converter. There are no limitations to the underlying time domain model, simulations based on Spice are possible. The theory behind the ‘Virtual Network Analyzer’ and ‘Sampled-Data Modeling’ approach is described in detail. An analysis of the performance and effort to implement these methods is presented...
In this paper, a modified carrier sense multiple access-collision avoidance (CSMA-CA) mechanism, termed as quiet period-CSMA-CA (QP-CSMA-CA) is proposed, for the purposes of coexistence in a cognitive networking set-up with secondary clients that seek access using 802.11. In work to date, dedicated quiet periods have been defined for this purpose, as a synchronized duration wherein all clients are...
Often data sheets provide only poor information about the recovery behavior of ultra-fast diodes. On the other hand, existing diode models do not predict the real characteristic for all diodes. Nevertheless, due to its importance, this behavior needs to be known and therefore measured. For this purpose, a fully automated measurement set-up for determining the reverse recovery characteristic of ultra-fast...
Often data sheets provide only poor information about the recovery behavior of ultra-fast diodes. On the other hand, existing diode models do not predict the real characteristic for all diodes. Nevertheless, due to its importance, this behavior needs to be known and therefore measured. For this purpose, a fully automated measurement set-up for determining the reverse recovery characteristic of ultra-fast...
In case of resonant converters, the corresponding steady-state analysis is in general more cumbersome than in case of PWM converters, as often a multitude of modes has to be regarded and resonant oscillations with durations impossible to calculate directly are encountered. Therefore, approximations are required in order to facilitate the design process. An extension to the well-known first harmonic...
The compliance with standards calls for proper designed EMI filters. EMI typically comprises common mode (cm) and differential mode (dm) noise. A systematic optimization of EMI filters requires the knowledge of the contribution and distribution of these two noise sources. The paper discusses different methods that allow the independent measurement of cm and dm noise. One suitable method described...
The investigation of the stability of larger power systems requires knowledge about output impedances of switch mode power supplies (SMPSs). Methods for the prediction of this quantity of a SMPS comprise state-space averaging and sampled-data modeling. However, results obtained from both methods exhibit large differences. Furthermore, sampled-data modeling itself yields completely different results...
Faced with ever shorter product cycles, SMPS designers require fast and reliable modeling tools. In case of resonant converters the derivation of the exact solution is complex and time-consuming. Thus, simplified calculation methods are attractive. However, the reduced accuracy of these approximation methods has to be taken into account carefully. In this paper, the concepts of the First Harmonic...
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