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A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
With the popularity of the concept of green energy, reducing the harmonic pollution of power equipment to power grid has become an important research topic in the field of power electronics. This paper takes three-phase current-source PWM rectifier system as the research object, and it presents a current-source PWM pulse signal tri-logic control method, and puts forward a pre-modulation method. Then...
This paper presents Indirect Matrix Converter(IMC) with improved control supplying power to different loads at different frequencies. An improved switching technique is used at the input stage of this proposed IMC so that a higher dc voltage is obtained compared to the IMC with conventional control. The fundamental input current is at unity power factor for all operating conditions. In this IMC, the...
In this paper, constrained model predictive control (MPC) based on parallel neural network optimization is proposed to apply to pulse width modulation (PWM) rectifier and improve power quality. An decoupled model of three-phase rectifier in abc coordinates is built. Then, the constrained MPC method is proposed. This method breaks the limits of predictive control with finite set and without constraints...
A three-phase three-port rectifier (TPTPR), which is capable of handling an AC port, a low voltage DC port and a high voltage DC port simultaneously, is presented in this paper. To directly transfer power from the AC port to the low voltage DC port within single-stage power conversion, a modified SVPWM strategy based on asymmetric three-level vector space is analyzed and evaluated in this paper. With...
This paper introduces a single-phase matrix converter (SPMC) excited rotary transformer system to replace the slip rings of traditional wound field synchronous machine (WFSM). Compared to an inverter excited rotary transformer system, the matrix converter is compact due to the absence of a bulky DC Link capacitor. In this paper, the proposed SPMC uses a new constant volts per Hz modulation method...
This paper proposes half-wave Class DE low dv/dt rectifier using thinned-out method with delta-sigma (Δ-Σ) modulation. The thinned-out method, which eliminates some switch voltage pulses by maintaining the switch in on-state for one switching period, is applied to the half-wave Class DE low dv/dt rectifier. The thinned-out pulses which are generally given as predetermined pulse patterns are continuously...
An analytical approach for accurate calculation of the conduction and switching power losses associated with the switching devices in the 5-Level 3-Phase Back to Back E-Type Converter (5L3ϕ BTB E-Type Converter) has been proposed in this paper. The 5L3ϕ BTB E-Type Converter is composed by two different multilevel topologies: the 5-Level E-Type Inverter and the 5-Level E-Type Rectifier. The power losses...
The paper presents a new bridgeless buck-boost PFC with the use of the Active Virtual Ground (AVG) technique which is called Manitoba Rectifier. The proposed topology can convert the grid AC voltage to a wide range of voltage output within a single stage circuit. By using the simple structure and the bridgeless technique, an efficient system is able to be guaranteed. In addition, the proposed topology...
This paper proposes a transformer based self-starting boost converter for thermoelectric energy harvesting, which operates even when polarity inversion of thermoelectric generator (TEG) occurs. TEG is used to convert thermal energy into electrical energy. Due to the Seebeck effect, an open circuit voltage of the TEG is proportional to the number of thermocouples in series and to the temperature difference...
In this paper, a novel LLC resonant converter with parallel input and parallel output circuit topology is proposed to achieve the good performance of reduced switch count and medium power compared with conventional parallel half-bridge resonant converter. The proposed LLC resonant converter has two resonant circuits, two resonant circuits use the same power switches to transmit power so that the switch...
Current source converter (CSC) is mainly applied in high medium voltage drives. To increase the system power region and reduce the output harmonics, parallel connection is an easy-implement and practical method. There are mainly two types of parallel based topologies. The direct parallel connect of two back-to-back CSCs is the first type, the two DC links can be controlled from the rectifier side...
The paper deals with a high efficiency boost rectifier for high rotational speed Gen-Set applications. It is tailored around a permanent magnet synchronous generator (PMSG) featuring an open end winding configuration. According to such a configuration the generator stator windings are connected on one side to a three level T-type unidirectional rectifier, and on the other side, to an auxiliary two-level...
This paper presents an Integrated switched-coupled-inductor boost-flyback converter (abbreviated as SCIBFC), which has benefits of both Integrated boost-flyback converter (IBFC) and switched coupled-inductor boost converter. The principle of the proposed converter, analysis of operation (including the effects of parasitic parameters), and design guideline are included. SCIBFC achieves soft-switching...
This paper investigates an economic and highly efficient power converter topology and its modulation scheme for 60kW buck-type rectifier system. The target system consists of three-phase three-switch buck-type rectifier topology. A new Carrier Based PWM scheme along with its simple implementation using logic gates is introduced. This PWM scheme replaces the diode rectifier equivalent switching state...
The Z-Source networks are recently being employed in the matrix converters (MCs) to overcome their main drawback, which is the low voltage transfer ratio (VTR). In spite of several Z-Source topologies introduced for the direct and indirect matrix converters, some important issues such as their modulation, operational modes, existing challenges in practical implementation, the design of an optimal...
This paper presents the analytical design procedure to select the inductance and the capacitance values of both the input and output filters for the 5-Level three-phase Back to Back E-Type Converter (5L3Φ BTB E-Type Converter). The 5L3Φ BTB E-Type Converter is used to accomplish the double conversion AC-DC/DC-AC in applications which include variable speed industrial electric drives and the interfacing...
This paper proposes a novel field excitation scheme employing 4-leg converter in Machine-side Converter (MSC) of Wound Rotor Synchronous Generator (WRSG) wind turbines. The conventional thyristor rectifier and brush/slip-ring contact for supplying the field excitation is replaced by the rotating transformer and diode rectifier in the field winding side. 4th-leg power converter of MSC provides ac voltage...
This paper proposes the improved topology and control strategy of three-phase cascaded bridgeless rectifier (CBR) suitable to serve as the rectifier stage for a medium/high voltage multilevel converter. Compared with traditional H-bridge based multilevel rectifiers, the proposed topology adopts much fewer fully-controlled devices, which greatly reduces the control complexity, thus increasing the system...
In this paper, a soft switching technique for a LED driver based on an Integrated Double Buck-Boost (IDBB) converter is presented. The converter is a two-stage cascaded Buck-Boost topology featuring a single main switch and positive voltage output. The first stage is connected to the grid and it is operated in discontinuous conduction mode (DCM); working this way, a high power factor is naturally...
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