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In order to meet the requirements of the magnetron sputtering, an asymmetric bipolar pulsed power supply based on DSP is presented in this paper. It can freely adjust the pulse parameters including pulse amplitude, frequency, duty cycle, and even the number and transition time of the positive and negative pulse according to the sputtering demands. Finally, a 5kW/ 100kHz prototype is designed. It adopts...
Economical and ecological motives are pushing shoreside power supply by power electronics systems for merchant ships as well as for cruise ships. Also, final tests of on-ship power systems and generation are simplified considerably. Fault scenarios on-ship and within the harbour grid and the variability of the parameters of on-ship distribution - each ship is special, and large consumers or generators...
Lightweight power supply systems using soft-switched high frequency dc-dc converter for rolling stock is proposed in this paper. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequency transformer and rectifier. This system features a boost chopper to control the input current and to set up a controlled DC link. And A soft switched full bridge inverter...
Design an electrical locomotive 110 V D.C. source with PFC based on the structure of two-stage switching converter. Discuss the design scheme of main circuit and control circuit. Expound the calculation method of the key parameters. The experiments indicate that the device gets good performance on output and reliability. The electric source is appropriate for electrical locomotive and the other similar...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
AC-AC converters have wide applications in AC motor drives and marine power supplies. Modern direct AC-AC converters are based on the new topology of matrix converters. Despite excellent features, matrix converters suffer from the problems associated with bidirectional switch implementation. In this paper, a new direct AC-AC converter is presented. The proposed system has most advantages of modern...
The conventional methods used in the isolation of the UPQC are add a isolation transformer in the point, in which series unit or parallel connection unit access the system, but owing to the non-linear of the transformer, this isolation method shall bring many baleful ingredients. In order to avoid the baleful influence of the conventional isolation transformer, the text introduces a sort of new-style...
A novel arbitrary waveform power amplifier based on switch-linear hybrid (SLH) technology is proposed in this paper. The proposed amplifier utilizes a source follower to achieve excellent output waveforms quality while a switch-mode tracking power supply is employed to obtain high system efficiency. The steady and dynamic performances of the proposed amplifier optimized by the low system output impedance...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
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