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一种小型化卫星脉冲行波管电源
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作者 王刚 《舰船电子对抗》 2001年第3期17-20,共4页
介绍了一种高效率、小体积、宽脉冲行波管电源 。
关键词 星载行波管 开关电源 宽脉冲调制器 TWTA 电磁兼容
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A new complete model of switch-mode plasma cutting power supply 被引量:2
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作者 Abdolreza Esmaeli 孙力 聂剑红 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第3期250-256,共7页
A complete model of switch-mode plasma cutting power supply and its simulation are developed. The full bridge isolated pulse width modulation (PWM) buck converter in continuous conduction mode (CCM) for high watt plas... A complete model of switch-mode plasma cutting power supply and its simulation are developed. The full bridge isolated pulse width modulation (PWM) buck converter in continuous conduction mode (CCM) for high watt plasma power supply is approached. Reduced ripple current and improved power factor are achieved in the plasma power supply. With a PID control strategy, circuit responses become more stable and faster with low overshoot during load and current changing. The converter achieved high efficiency under 3 to 15kW load conditions. 展开更多
关键词 plasma cutting power supply PWM buck converter PID compensator MATLAB simulation
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Modular High-Power Electronics for a High-Speed MLC Flywheel Energy Storage System 被引量:5
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作者 Veselin Vracar 《Journal of Energy and Power Engineering》 2012年第11期1856-1861,共6页
The operation of a motor drive for high-power, high-speed applications, especially for the permanent-magnet synchronous AC motors with regeneration capability is presented. Power system utilizes a SVHPWM (space-vecto... The operation of a motor drive for high-power, high-speed applications, especially for the permanent-magnet synchronous AC motors with regeneration capability is presented. Power system utilizes a SVHPWM (space-vector-based hybrid pulse width modulation) for a reduced harmonic distortion and switching loss. Associated electromagnetic interference mitigation and cooling requirements are significantly reduced. Voltage source inverter drives a three-phase MLC200 flywheel. The modularity of the proposed topology also simplifies overall system design and manufacturability. The system topology and control strategy are discussed. Simulation results are presented to illustrate the harmonic distortion and switching loss reduction and reduced line current ripple. 展开更多
关键词 Motor drive FLYWHEEL space vector hybrid PWM simulation model.
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Switchable Optical Ultra-Wideband Pulse Generator Based on Polarization Modulator
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作者 魏志虎 王荣 +2 位作者 蒲涛 孙帼丹 方涛 《China Communications》 SCIE CSCD 2013年第7期113-117,共5页
In order to generate optical Ultra- Wideband (UWB) pulse train with a switchable shape, a novel method based on a Polarization Modulator (PolM), a Polarization Controller (PC) and a delay line, is proposed and e... In order to generate optical Ultra- Wideband (UWB) pulse train with a switchable shape, a novel method based on a Polarization Modulator (PolM), a Polarization Controller (PC) and a delay line, is proposed and experimentally demonstrated. Experimental results show that when a Gaussian pulse is applied to the PolM, under different phase shifts introduced by the PC, a gauss or gauss doublet pulse will be generated at the output of the Polarization Beam Splitter (PBS). If the two- path signals after PBS are properly delayed, Gaussian monocycles or third-order gauss pulses will be generated at the output of the Polarization Beam Combiner (PBC). 展开更多
关键词 optical communication UWB polarization modulation
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Research and Making of a High-Power Switching Supply Using Pulse Width Modulation
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作者 焦斌 《Journal of Donghua University(English Edition)》 EI CAS 2005年第2期87-89,共3页
Compared with the traditional SCR phase-shift regulated power supply, a new type of power semiconductor , noncrystalline state magnetic material and pulse width modulation technology, high-power switching supply has m... Compared with the traditional SCR phase-shift regulated power supply, a new type of power semiconductor , noncrystalline state magnetic material and pulse width modulation technology, high-power switching supply has many advantages: small volume, high converting efficiency, good dynamic performance, small harmonic componont and small pollution to AC supply. 展开更多
关键词 IGBT pulse width modulation SWITCHING supply
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The Bi-directional Three-Phase PWM Rectifier Inverter for Electric Vehicle Charging Station
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作者 Lei Shi Haiping Xu Dongxu Li Zuzhi Zhang Yuchen Han Zengquan Yuan 《Journal of Energy and Power Engineering》 2013年第7期1370-1376,共7页
Applications of electric vehicles need to build a large number of charging stations. The electric vehicle charging stations communicate with the grid. In V2G (vehicle to grid) mode, electric vehicles can be used as ... Applications of electric vehicles need to build a large number of charging stations. The electric vehicle charging stations communicate with the grid. In V2G (vehicle to grid) mode, electric vehicles can be used as energy storage units and transfer power to the grid. The electric vehicles charge at night to reduce the cost and the grid load, simultaneously to fill the valley. When grid load increases, electric vehicles' batteries discharge to the grid to improve the stability of the grid. As distributed storage units, electric vehicles are important components of the smart grid. In this paper, the three-phase PWM (pulse width modulation) rectifier used for smart charging and discharging system of electric vehicles are analyzed and designed. This paper includes the principle of PWM rectifier-inverter and direct current control strategy. Also, the SVPWM (space vector pulse width modulation) and system design of three-phase PWM rectifiers are analyzed. A 10 kW prototype is developed. Simulation and experiment results show that the three-phase PWM rectifiers reach the unit power factor. From the experimental results, PWM rectifier implements the sinusoidal grid current and achieves the unit power factor. 展开更多
关键词 PWM rectifier electric vehicle charging stations smart grid.
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Spectral Calculation of the Output Voltage of an Inverter with Bipolar Pulse Width Modulation
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作者 Mreela V. Sunde Z. Beneie 《Journal of Energy and Power Engineering》 2010年第8期48-56,共9页
Converters with pulse width modulation are used for connections between the direct current (DC) and alternating current (AC) networks, e.g., in uninterrupted power supply systems, AC electromotor drives, for power... Converters with pulse width modulation are used for connections between the direct current (DC) and alternating current (AC) networks, e.g., in uninterrupted power supply systems, AC electromotor drives, for powering induction furnaces, in audio technique. Spectrum of signals sampled by pulse amplitude modulation and output voltage spectrum of the converter with pulse width modulation have similar properties. Spectrum of signals sampled by pulse amplitude modulation contains a harmonic of frequency equal to the frequency of the modulating signal and the harmonics of frequencies equal to the sum of frequency of the modulating signal and multiples of the sampling frequency. The output voltage spectrum of the converter with bipolar pulse width modulation contains harmonic of frequency equal to the frequency of the modulating signal and harmonics of frequencies equal to sum of the frequency of the modulating signal and multiples of the frequency of the carrier signal. It also contains harmonics of frequencies equal to the sum of the multiples of the frequency of the modulating signal and the multiples of the carrier signal. The comparison analysis was carried out for the harmonics of the output voltage of the converter with bipolar pulse width modulation in time domain. The dependency of the amplitudes and frequency spectrum on the wave forms of the carrier signal and modulating signal was shown. Similarity of the output voltage spectrum of the converter and signal spectrum sampled by the pulse width modulation was also shown. Key words: Output voltage converter with bipolar pulse width modulation, spectral analysis, Fourier series, carrier signal, reference signal. 展开更多
关键词 Output voltage converter with bipolar pulse width modulation spectral analysis Fourier series carrier signal referencesignal.
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Sensorless Control of Switched Reluctance Motor Drive Systems
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作者 Ali Oshieba Hassan Bflzzi +1 位作者 Hady Abdel-Maksoud Mahmoud Khater 《Journal of Energy and Power Engineering》 2013年第1期118-125,共8页
This paper presents a sliding mode observer for sensorless operation of SRM (switched reluctance motor) drive. Design of such an observer depends mainly on the nonlinear model of SRM. In this technique, neither extr... This paper presents a sliding mode observer for sensorless operation of SRM (switched reluctance motor) drive. Design of such an observer depends mainly on the nonlinear model of SRM. In this technique, neither extra hardware nor huge memory space are not required but it only requires active phase measurements. Furthermore, PI (proportional integral) and adaptive FLPI (fuzzy logic PI) controllers are suggested to operate individually along with the SMO (sliding mode observer) to cover a full speed range of sensorless controller. Both controller schemes operate in PWM (pulse width modulation) control mode. The proposed observer is implemented and tested using a digital signal processor. All results obtained with both simulation and experimental investigations corroborate the superior performance of the adaptive fuzzy logic controller (FLPI) when compared with those of PI controller. 展开更多
关键词 Switched reluctance motor sliding mode observer adaptive fuzzy logic control PI controller.
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