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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...
In this paper zero-vector intervals of eight-segment PWM scheme based on space vector modulation (SVM) is optimized for three-phase isolated buck matrix-type rectifier. With the proposed non-equally distributed zero-vector intervals of eight-segment PWM scheme, the output inductor current ripple of the converter is reduced comparing to that of the equally distributed zero-vector intervals. The steady...
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 stray magnetic field around inductive-power-transfer coils is influenced by the phases of the transmitter's and receiver's currents. This influence is analyzed with the diagrams of phasors for the currents and magnetic fields. The dual-side-controlled converter is applied for the circuit realization, in which the bridges with MOSFETs are used for the inverter on the transmitter side and rectifier...
A battery-free power management circuit (PMC) for an impact-type piezoelectric energy harvester for micro wind is presented in this paper. As the energy generated by micro wind is intermittent, sleep mode is adopted for the PMC to save power. A new energy sensing circuit is designed to detect the energy level generated by the piezoelectric cantilever and then to control the operation modes, sleep...
This paper introduces the unified equivalent circuit model for modular high voltage(HV) power generation architectures. The HV generation architectures are introduced considering the modularity of key HV components such as transformers or rectifier circuits firstly. An equivalent resister and capacitor circuit network is adopted to model the HV transformer and multi-stage voltage multiplier circuit...
The four-quadrant converters applied to the locomotive traction have higher requirements for the power density and reliability. Compared with conventional IGBTs, RC-IGBTs have the advantages of low thermal resistance and high current density. In this paper, RC-IGBT is applied to four-quadrant converter and the working characteristics and pulse distribution of four-quadrant converter under the desaturation...
This paper introduces a single-stage isolated 48V-to-1.8V point-of-load converter based on the impedance control network (ICN) resonant converter architecture. This point-of-load ICN converter achieves large step-down while maintaining high efficiency across a wide range of input voltage and output power. Large step-down is achieved through a combination of stacked inverters, a transformer and a resonant...
This paper presents dynamic analysis of a Modular Multi-Parallel Rectifier (MMR) based on state-space modelling. The proposed topology is suitable for high power motor drive or multi-parallel AC-DC applications, which can reduce line current harmonics emissions significantly. However, a proper controller is required to share and control current through each rectifier. Mathematical analysis and simulations...
Mobile power substations (MPSs) are optimally designed to be installed on a truck bed for ease of transportation in order to provide an interface between two medium-voltage distribution systems under emergency or maintenance conditions. Based on the solid-state transformer (SST), a topology of N-series modules concept is proposed for MPS. The average control methods are used to balance the voltage...
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...
To address the DC link voltage regeneration issue in parallel Uninterruptible Power Supply (UPS) system, a DC link voltage protection (DCVP) method through online virtual resistance regulation is proposed. The proposed control strategy is able to protect the DC link from overvoltage that may trigger the protection mechanism of the UPS system. Moreover, a current sharing control strategy by regulating...
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...
In this paper a design and simulation model of a brushless, self-excited field winding machine is presented. The rotor of this machine possesses two windings, a field winding and a “transformer” winding, that are connected through a diode rectifier circuit. Using field-oriented control techniques, an AC magnetic field is generated by the stator windings that is always aligned with the transformer...
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...
With the increasing use of medium voltage drive systems in power plant, it is interesting to develop a novel internal electrification scheme based on common DC bus concept. Despite obvious improvement on efficiency increasing, one of the most concerned issues is whether reliability performance would decrease to an unacceptable level led to by introduction of common DC bus layout. To mitigate the concern,...
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