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Since the loss of input rectifying diode bridge in the conventional PFC converter reduces the efficiency, the bridgeless PFC converter has been proposed. The totem-pole bridgeless PFC converter is the most representative one. However the common mode noise current occurring around the input voltage zero-crossing brings severe EMI problem restricts its practical application. In order to improve noise...
In general, Boost circuit is widely used as PFC circuit to achieve high power factor (PF), but the power supply needs to add a Buck circuit in the case of low-voltage output applications. Two-stage circuit requires more components and two control circuits. On the other hand, as the power levels increase, the full-bridge diode rectifier reduces the converter efficiency due to the large conduction losses...
This paper presents a novel cell voltage equalization system, which employs cell management modules that can be attached with individual cells in a battery bank. A unique resonant bi-directional DC-DC converter topology is employed to facilitate bi-directional energy transfer between cells and the battery bank. A mathematical analysis of the bi-directional resonant DC-DC converter system is presented...
This paper addresses the optimal design of leakage inductance of the high-frequency transformer in dual active bidirectional converter stages of cascaded bidirectional converters. By the analyzing realization condition of zero-voltage-switching and the method to reduce reactive power under controlling of single phase shifting control strategy, the optimized circuit parameters are selected. An experimental...
As a new type of smart material, the Dielectric Electro Active Polymer (DEAP) is introduced in terms of configuration, working principle and potential applications. The design of an autonomous high voltage driving system for DEAP actuator is investigated. The system configuration and the design methodology of a high voltage converter are discussed in detail. Based on the heating valve application,...
In order to deal with frequency restoration and protect the energy storage units, this paper analyses the control method of microgrid based on hierarchical control, and proposes an innovative secondary frequency control method which optimize the output of energy storage units in island mode. The simulation results show that the algorithm can make microgrid provide high stability and power quality...
Topology and power sharing strategy are two important issues of hybrid energy storage research. In this paper, a novel hybrid power storage topology based on modular multilevel converter is proposed. And a specially designed PWM method is used to realize active voltage balance. Based on the topology, a novel power sharing strategy based on fuzzy logic controller is proposed. Compared to other two...
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