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In this paper, a 500 W, 400 V to 48 wireless power transfer system for vehicle battery charging is analyzed, designed and implemented. Series-series resonant topology is used due to ease of analyze and control. The secondary bridge rectifier is replaced by a sync rectifier consists of four MOSFET in a full bridge configuration in order to reduce conduction losses on rectifier. An efficiency of 92...
In this paper, an analytical expression for the DC bus harmonics on the input capacitor, caused by a three phase pulse width modulation (PWM) inverter of a high speed motor drive system, is derived. As the result, we found that the parasitic line inductance between the battery and the input capacitor, and the input capacitor are indirectly proportional. We can achieve the calculation method of the...
Resonant power conversion is an effective technology for various applications. This paper presents a resonant magnetizing approach, aimed at improving the low power density and cost issues of traditional capacitor-discharged impulse magnetizer. In the method, a resonant tank is established by a series capacitor and inductor. Then, by periodically switching power transistors inside the circuit, the...
This paper presents the analysis and design of an inductively-coupled wireless power transfer system implemented using a three-coil arrangement and the Class E2 resonant DC-DC converter. The three-coil structure is modeled using FastHenry simulation software. The theory of reflected impedance is used to determine the optimum operating conditions. A practical application having an output voltage of...
This paper proposes a control method to extend the range of ZVS in the phase-shifted full-bridge(PSFB) converter without any additional auxiliary components. During the dead-time, ZVS is achieved by using the energy stored in the inductors to discharge and charge the output capacitance of switches. By analyzing the equivalent circuit of the converter during dead-time, the relationship between the...
This paper presents the analysis of problem as to when the GaN HEMT (Gallium nitride high electron mobility transistor) is applied to power conversion system. Compared to state-of-the-art super junction Si (Silicon) MOSFET (Metal oxide semiconductor field effect transistor), the FOM (Figure of merit) is much better because of heterojunction structure and wide band gap characteristics. However, designing...
A surge protective device (SPD) is used in low-voltage power systems to protect electrical equipment from surges induced by lightning. An SPD has a drawback that its impedance becomes low in case of SPD failure. This failure can cause not only the SPD, or other devices near it, to catch fire or make an upstream over current protection device (OCPD) operate unnecessary, and also can cause serious damage...
Recently, a world is the point of need with new energy of high efficiency measures according to global climate change issues and energy shortages. [1] One of the various measures an energy control is to design and development at a precise circuit that can be used conservation and efficiency as the center with the power in industrial apparatus. High-frequency induction heat treatment industrial facilities...
A small modular unit for a power converter system with long lifetime DC-link capacitors is proposed. To reduce the ripple current stress of DC-link capacitors and to improve their lifetime by limiting temperature rises, low phase-to-phase-impedance busbars are selected. Consequently, in a power converter system whose size is 101 L, operating at a rated power of 100 kVA, DC-link capacitors achieve...
Active damping of grid-connected LCL filter resonance by means of an observer loop to estimate the capacitor current is a well-known method. However, with variation of the grid side inductance due to grid conditions, the system robustness has to be checked. This work discusses the effect of the observer design on the system robustness against grid side inductance variation. Different values of resonant...
The main theme of this paper is to propose a switching control method for LLC converter with larger magnetizing inductance to improve the light load efficiency. The proposed switching technique is to replace conventional frequency modulation method which is with constant duty while regulating the output voltage by varying the switching frequency, with pulse-width modulation while retaining the special...
A primary-side regulation AC-DC converter operating in PFM (Pulse frequency modulation) mode with highly accurate output current is designed, which employs a novel inductance compensation technique to improve the precision of output current, diminishing the bad impact of the big tolerance of the transformer primary inductance in the same batch. An improved method to detect the demagnetization time...
This paper focuses on Voltage Fed Dual Active Bridge (VF-DAB) bidirectional DC-DC converter modules connected Input Parallel and Output Parallel (IPOP) configuration. Modularity or parallel operation of the bidirectional DC-DC converters for energy storage application is not just an economic solution for increasing the power transfer capability, but also provides several advantages such as redundancy,...
For development of inductive coupled wireless power transfer (WPT) systems, it is important to consider the overall efficiency of the WPT systems, where the overall efficiency is expressed as the product of the transmission efficiency of coupling coils and the power-conversion efficiency of power converters. Additionally, there are mutual dependencies between coupling coil parameters and power-converter...
This paper proposes a method to improve the power efficiency in the half-bridge LLC resonant DC-DC converter. The optimum design of a transformer is discussed to improve power efficiency. The interlinkage magnetic flux in the primary and secondary wires causes eddy currents, which results in a power loss. This study demonstrates that power loss can be reduced through optimum design of the strand diameter...
This paper proposes a power-loss reduction technique for a kW-scale isolated dc-dc converter, which installs a novel PWM control to achieve the soft-switching of primary side MOS-FETs. As a result, the efficiency is achieved over 90% in a wide load range. Moreover, the temperature of the primary side MOS-FETs can be reduced by 30 degrees when compared with the conventional method, and the power-density...
A family of four quadrant DC/DC converters is presented in this paper. Compare with existing four quadrant DC/DC converters that have been introduced in literature, the proposed converters have lower number of components. There are two bidirectional switches, two coupled inductors and one capacitor in proposed converters that can lead to lower cost and also smaller occupied space. The proposed converters...
This paper proposes an isolated DC-DC converter for Power-Supply on chip (SoC) realized by the couple of air-core coils. The pro-posed isolated DC-DC converter is evaluated by numerical simulations and experimental results. The fabricated prototype DC-DC converter works well and the simulation results are good agreement with experimental results. This paper also discusses the potential of proposed...
A new hybrid zero voltage switching (ZVS) three-level and half-bridge DC/DC converter is presented to achieve the functions of low voltage stress of switches, low circulating current during the freewheeling interval, wide ZVS range of lagging-leg switches, low output inductor and energy transfer within the whole switching period. The proposed converter includes a three-level phase-shifted pulse-width...
In this paper, a novel high step-up converter with coupled inductor boost converter is proposed. The circuit topology of the proposed converter is derived from conventional boost converter with coupled inductor connection such that high step-up voltage gain with proper duty ratio is achieved. Besides, the coupled-inductor technique concept also can be adopted to construct other step-up converters...
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