共查询到18条相似文献,搜索用时 125 毫秒
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采用基于NCP1200的电流型控制,设计并研制了应用于高速磁悬浮电动机变频器的开关电源,该电源自适应输入电压波动,并自动调节PWM占空比以保证输出电压恒定.实验结果表明,该电源具有输出纹波小、效率高、EMI小、电压调整率和稳压性能好等优点,可用作变频器控制电路的电源. 相似文献
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研究电源系统故障模式是发现和解决设备故障的重要环节。为了更直观地展现飞机交流电源系统故障类型与故障表现的关系,根据其工作原理以及常见故障,利用Simulink设计并搭建了系统故障分析模型,具体对电压频率异常、三相负载不平衡、相间短路、相断路等5种故障类型进行仿真。该故障分析模型可便捷设置不同故障状态,模拟交流电源系统的工作过程,并输出馈线电压电流波形和故障类型编码,为发现并解决故障提供了模型基础,能够针对性地给出故障的视情维修方案。实例仿真表明,该模型能用于仿真多种故障,有助于故障解决方案的给出,验证了系统故障分析模型的可行性与通用性。 相似文献
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某型装备控制组合倾斜通道积分电路是控制组合倾斜通道的重要组成部分,能够延缓跳变电压,使装备保持倾斜稳定。为了提高对控制组合的测试广度和修理深度,需要在该型装备控制组合原测试设备上增加积分电路自动化测试功能,本文介绍了该功能的实现。 相似文献
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针对应用于交直交VSCF飞机电源系统的SPWM逆变器,提出了包含交流电流内环和交流电压外环的双闭环控制系统方案,利用交流瞬时值反馈的波形校正作用使逆变器输出电压波形得以改善。通过对单相1 kVA SPWM逆变器双闭环控制系统的设计分析和实验研究,结果表明:采用交流瞬时值反馈控制的SPWM逆变器具有较好的输出电压波形、动态响应特性和稳态调压精度,对逆变器输入直流电压的变化影响有很好的抑制作用,适合任由永磁无刷直流发电机供电的VSCF电源系统中应用。 相似文献
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The Auto-Transformer Rectifier Unit (ATRU) is one preferred solution for high-power AC/DC power conversion in aircraft. This is mainly due to its simple structure, high reliability and reduced kVA ratings. Indeed, the ATRU has become a preferred AC/DC solution to supply power to the electric environment control system on-board future aircraft. In this paper, a general modelling method for ATRUs is introduced. The developed model is based on the fact that the DC voltage and current are strongly related to the voltage and current vectors at the AC terminals of ATRUs. In this paper, we carry on our research in modelling symmetric 18-pulse ATRUs and develop a generic modelling technique. The developed generic model can study not only symmetric but also asymmetric ATRUs. An 18-pulse asymmetric ATRU is used to demonstrate the accuracy and efficiency of the developed model by comparing with corresponding detailed switching SABER models provided by our industrial partner. The functional models also allow accelerated and accurate simulations and thus enable whole-scale more-electric aircraft electrical power system studies in the future. 相似文献
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Guan-Chyun Hsieh Jung-Chien Li 《IEEE transactions on aerospace and electronic systems》1993,29(1):157-165
An AC active load simulator circuit which can simulate a desired load impedance with a power factor from zero to unity (leading or lagging) for the tested AC source is realized and tested. An interface circuit is designed to compute the simulated current waveform for the load-driver circuit according to the specified program of the system control unit and the measured source frequency and voltage amplitude. Both inductive and capacitive loads can be simulated by adjusting the phase difference between the voltage and current waveforms. A software feedback control approach is employed to adjust the current amplitude and the power factor for the purpose of maintaining the impedance value constant regardless of the variation of the source voltage amplitude 相似文献
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介绍了五轴联动磁流变抛光系统中的关键部件———公自转电磁抛光轮的结构设计进行了详细阐述,创造性的将电刷供电方式应用于该新型抛光轮的结构中。设计并开发了直流供电及交流供电两种驱动电源,并开展了抛光去除特性试验研究,对磁流变抛光过程中的主要控制参量直流线圈电压大小对被抛光工件表面材料去除特性的影响进行了研究。 相似文献
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针对GJB152A-97交流供电CS101试验中存在的问题,提出了一种新的干扰电压的注入和监测方法。该方法不仅提高了试验的合理性,而且降低了试验中可能出现的风险。 相似文献
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A single-phase ac/ac converter based on neutral-point-clamped scheme is proposed to perform unity input power factor and to provide a stable ac voltage to the critical loads. The ac/dc rectifier part is controlled to generate a unipolar pulsewidth modulation (PWM) waveform on the ac terminal by using four power switches with voltage stress of half the dc-link voltage. The carrier-based current control scheme is employed in the inner control loop to track the line current command. To regulate the dc bus voltage, a proportional-integral (PI) control is adopted in the outer control loop. The dc/ac inverter part of the system with four power switches is employed to generate a stable and clean sinusoidal output voltage to the critical load. The instantaneous current control scheme is used to track the output voltage command. To verify the effectiveness of the proposed control algorithm, the simulation and experimental results based on a laboratory prototype were implemented and discussed. 相似文献
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唐小贝 《海军航空工程学院学报》2016,31(4):480-484
电源系统是为某型训练指挥台内部各设备提供能源支持的基础单元。通过对电源系统的组成结构和功能的系统分析,针对电源系统存在的 3个方面不足,包括:启动冲击电流过大、电源开关存安全隐患以及风扇组交流负载消耗不合理,提出相应的优化措施,即:应用软启动电源降低启动冲击电流、利用低压控制高压提高安全性、使用直流风扇替换交流风扇降低交流负载消耗。实际应用表明,在采用上述优化措施后系统的可靠性和安全性均得 到了明显提高,达到了优化的目的。 相似文献
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为了获得一种性价比较高的电子束表面处理技术,采用定频调压电路,研制出一种新型偏压脉冲电源。这种电源由偏压主电路拓扑、偏压变压器和偏压整流滤波电路组成,其中偏压主电路由偏压基值发生电路和偏压脉冲发生电路组成。偏压基值发生电路控制偏压脉冲基值,偏压脉冲发生电路控制偏压脉冲频率和占空比。脉冲偏压电源的脉冲基值、脉冲频率、占空比均连续可调,相应实现脉冲束流的幅值、束流频率和占空比的调节。检测分析了脉冲偏压电源的输出电压波形,带载时的输出束流波形,并观察分析了电子束轰击后钨合金组织变化规律。结果表明所研制的脉冲偏压电源输出电压稳定、可调性好,能满足小束斑脉冲电子束轰击工艺的要求。 相似文献