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This paper proposes a new control approach for tracking the optimal operating frequency of a backlight inverter. First, a class E backlight module is introduced to simplify the backlight circuit and to raise the system efficiency. A piezoelectric transformer (PT) is used to drive the cold cathode fluorescent lamp (CCFL) to eliminate the drawbacks of a conventional transformer and to reduce the dimension...
According to the basic characteristics of arc welding and cutting, the multi-functional arc welding/cutting inverter based on phase shift-full bridge-zero voltage and zero current switches (PS-FB-ZVZCS) is designed. This paper analyzes design procedures and carefully selects components, which provide the theoretic foundation for the manufacture of PS-FB-ZVZCS inverter power sources. Then, this paper...
For the two-stage matrix converter (TSMC) having no energy storage elements, the nonsinusoidal supply voltages will disturb the output voltage and result in low order harmonics. To compensate the output voltages, two new space vector modulation strategies are presented. One works with the rectifier stage, and the other with the inverter stage. The maximum transfer ratio under nonsinusoidal input is...
A novel hybrid flying-capacitor-half-bridge cascade inverter is developed in this paper. The novel inverter is based on connection of multiple single-phase flying-capacitor-half-bridge (FCH) 5-level inverter modules per phase. With the dc bus voltage ratio V1:V2=1 :2, the phase voltage of the novel inverter with two modules per phase will output 13 voltage levels. A new hybrid FCH modulation control...
Cascade multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascade multilevel inverter requires separate dc voltage sources, available dc sources include batteries, photovoltaic arrays and fuel cells...etc. If variations or fluctuations occur at the input voltage, the harmonic distortion of the inverter output voltage...
For the using of permanent magnet material, permanent magnet synchronous motor (PMSM) can generate back EMF even rotating without load. Railway vehicle has the special working condition of costing. When PMSM is applied to railway traction system, the high back EMF during coasting and the difficult of re-closing must be resolved. Reducing synthesized air-gap flux linkage with adding negative d-axis...
Fault-tolerant motor drives are becoming more important in safety critical applications. Using a special motor design and an appropriate inverter topology, brushless permanent magnet AC motor drives can have a fault-tolerant capability. This paper considers a dual motor drive system on a common shaft to introduce redundancy. The paper provides a systematic classification for the potential electrical...
As a high-tech product, Inverter is used in plenty of industrial fields. We developed an experimental sample machine, with FPGA and high-voltage MOS gate driver adopted. This paper presented the main structure and functional modules of this variable frequency speed adjusting system based on FPGA. Furthermore, the method of implementing VWF strategy on a FPGA chip is introduced in detail, including...
The structure and design method of an electric drive system for high power applications are presented. A multiphase permanent magnet brushless dc motor (PMBDCM) fed by a current source inverter (CSI) with thyristors acts as the kernel of the proposed electric drive system. Therefore, the system takes on advantages of both those two devices. The PMBDCM is simulated by FEM. The performance of power...
This paper present a simple hysteresis rule-based strategy for matrix converters for wind energy systems, which performs well under normal and abnormal input supply. The proposed method is based on the indirect control method, which divide matrix converter into two stages: a front rectifier stage (VSR) and a subsequent inverter stage (VSI) connected by a fictitious DC-link. The method selects the...
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