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Due to the loose coupling characteristic of the wireless power transfer system, design of the compensation topology is important. In SS resonant compensation condition, using Buck circuit in secondary side, the output load current and the duty cycle showing approximate inverse relationship in a wide range, making traditional Buck circuit control method cannot be used. To solve this problem, this paper...
In order to improve the charging speed, the Supercapacitor is used as the energy storage device in wireless power transfer (WPT) systems applied to electic vehicles. The analysis of WPT with Supercapacitor as load was carried out and charging strategy of Supercapacitor was studied on in this paper. In order to improve the transmission efficiency of the system , the reference value of the primary coil...
The significant constraint for the applications of wireless power transfer is the low efficiency, compared to the traditional electric wired connection. In order to improve the transfer efficiency, a variety of compensation networks are proposed to reduce the reactive power transfer but parameter selection is only based on coupling coils and ignores the inverter loss. In this paper, compensation capacitor...
A novel direct ac-ac converter based on the switched-capacitor and series resonant principle, featuring with soft switching characteristic and bidirectional power flow, is proposed in this paper. The converter consists of a LC resonant tank, switched-capacitors and reverse blocking IGBTs (RB-IGBT), resulting in small size and light weight; high efficiency is achieved by adopting soft switching technology...
An insulated gate bipolar transistor (IGBT) physical model with field stop cell structure is presented in this paper. The extraction method for all parameters is also given here. The parameters are extracted for Fuji Electric 1.7kV/300A IGBT (2MBI300VN-170-50). The accuracy of the model is verified by experiments.
In a hybrid IGBT module with SiC diodes as free-wheeling diodes, high frequency oscillation occurs during turn-on, which will cause higher EMI noise due to the larger capacitance of SiC diode. To evaluate the influence of gate drive parameters on turn-on oscillation, different gate voltages and gate charge currents are used. It is found that by changing gate drive parameters alone cannot reduce the...
Multi-MW wind power converters are widely applied in wind power field. Converters are paralleled to expand converter's capacity. Due to the wind power fluctuation, IGBT's power handling ability together with its drive power is fluctuating largely and rapidly, which will cause a large temperature variation, affecting the reliability and lifetime of power semiconductors. In this paper, the thermal smooth...
The 1700V/400A hybrid module is consisted of Si-IGBTs and SiC-SBDs mounted in a general 2in1 package. Because the reverse recovery current of SiC-SBD is very small to be an unipolar device, reverse recovery and turn-on losses at 400A on the hybrid module are 83% and 38% lower than that of the conventional all Si module, respectively. Therefore there is a further advantage of hybrid module at high...
Offshore wind power converter is usually packed in a closed cabinet equipped with water cooling to meet the moisture and salt spray prevention requirements. When a sudden dip of wind speed happens, the generated power will reduce significantly, making power semiconductor device and cooling water's temperature reduced quickly. While the air temperature inside cabinet decreases slowly. Thus, the water-cooling...
Although SiC MOSFET has significant improvements on switching performance compared with traditional Si power devices, the dynamic loss of the converter rises with the increase of the switching frequency of the converter. To further improve the efficiency of SiC inverter and power density, Zero-Voltage-Switching (ZVS) is investigated. A SiC full-bridge inverter with ZVS-switching is presented. The...
A T-type three-level inverter topology with RB-IGBT is researched. The operation modes and modulation strategy is analyzed. The power loss of T-type inverter with RB-IGBT and normal IGBT is calculated and compared. Experimental results show that T-type inverter with RB-IGBT has better efficiency than that of normal IGBT.
Uses the Energy Saving System Based on Bidirectional 3-Level DC-DC Converter with Super Capacitor as a platform to research different topology of Bidirectional 3-Level DC-DC Converter, analyze their structural features, deduce the relationship between input parameters and output parameters, and then select a circuit topology according to comparison result in this paper. The control strategy of 3-Level...
To satisfy the need of high performance, a grid-connected hybrid cascaded H-bridge single-phase inverter is proposed. The topology of the inverter has different DC voltages, and a modulation method minimizing the switching loss is applied. In order to improve the control performance, the phase lock loop (PLL) based on generalized second-order integrator is adopted. A current controller based on Proportional-Resonant...
Compared with conventional direct matrix converter, two-stage matrix converter has similar input/output characteristic. Furthermore, two-stage matrix converter can be implemented and controlled much easier since it has a practical DC-link. RB-IGBT is employed to construct bi-directional switches in two-stage matrix converter, which reduces on-state voltage drop and power loss of the converter. In...
Compared with conventional direct matrix converter, two-stage matrix converter has similar input/output characteristic. Furthermore, two-stage matrix converter can be implemented and controlled much easier since it has a practical dc-link. RB-IGBT is employed to construct bi-directional switches in two-stage matrix converter, which reduces on-state voltage drop and power loss of the converter. In...
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