Abstract-Burst mode control is applied to improve light load efficiency of LLC converter in this paper. Detailed analysis on characteristic and operation processes of LLC burst mode control with SR is presented. Based on the analysis, some important rules of LLC burst mode control are proposed, which is the key to achieve high light load efficiency. The rules include: the suitable primary and secondary driving timing, design guild line of output filter, reasonable control strategy etc. To verify the analysis, a prototype with 12V/100A output has been built. Thanks to the proposed control strategy and optimum design, light load efficiency of LLC converter can be improved significantly, such as efficiency at 10% load can be improved from 92.5% to 94.8%.

Absnact -To achieve high efficiency PFC front stage in switching mode power supply (SWS), Dual Boost PFC (DBPFC) topology shows superior characteristics compared with traditional Boost PFC, but it by nature brings higher EMI noise, especially common mode (CM) noise. This paper deals with the modeling and analysis of DBPFC CM noise based on and compared with Boost PFC, noise propagation equivalent circuits of both topologies are deduced, and theoretical analysis illustrates the difference. Experiments are performed to validate the E M model and analysis.I. (b) Smcture 575 0-7803-8458-X/04/$20.00 02004 IEEE

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Distributed generation (DG) based on oilfield associated gas has the characteristics of dispersive and small capacity. According to load control type, DG is treated as PQ point in power flow calculation. A distribution network reconfiguration algorithm based on simulated annealing and immune is proposed in this paper. Boltzmann simulated annealing operator is used in selection operation, and method of immune vaccine is adopted also, both the diversity and convergence performance of population are improved. Based on the traits of infeasible solutions in evolution, a method of public switches matrix of loops is used to avoid the infeasible solutions and searching space is compressed effectively. The tested system shows the advantages of given method, and great benefits can be obtained in oilfield application.

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