共查询到19条相似文献,搜索用时 140 毫秒
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多电平变换器——功率变换器新品种 总被引:4,自引:0,他引:4
多电平变换器是大功率应用优选功率变换器新品种时才引人注目的,本文阐述最新发展的三种多电平变换:(1)二极管箝位;(2)浮动电容器;(3)有各自直流源的级联逆变器,经计算机仿真,并用IGBT作功率开关器件和DSP作全数字控制器的样机验证,给出了工作原理、特点,优缺点和应用范围。 相似文献
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针对当前使用NMOS固态功率电子开关的载人航天器智能配电系统存在NOMS隔离驱动控制电路占用大量硬件资源,且不能满足能源系统自主健康管理遥测信息采集需求的问题,文中提出了一种基于PMOS固态功率电子开关构建的智能配电系统设计方案。相对于NMOS,PMOS用于正线开关的非隔离驱动特性避免了配置隔离控制电路带来的系统资源代价问题,在简化硬件电路设计的同时获得了更多的遥测信息,解决了有限硬件资源与更多遥测参数需求的矛盾。针对SSPC负载短路保护特性带来的固态配电系统母线电压跳变问题,文中给出了提高固态配电器可靠性的辅助电路方案,可使负载短路保护故障不影响母线稳定。 相似文献
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电流模式电源的工作原理是基于对流经电感的峰值电流的监视.通过调整功率开关关断时的峰值电流设置点,使反馈环路能够稳定流向给定负载的功率.但是在某些情况下环路要求获得最大的输出功率,这种情况发生在启动期间或转换器过载或短路时.然而,脉冲宽度调制(PWM)控制器的内部电路中含有几个影响反应时间的级联逻辑门.图1a显示了安森美半导体(www.onsemi.com.cn)固定频率控制器NCP1200的简化电路: 相似文献
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基于SSPC的负载自动管理技术 总被引:1,自引:0,他引:1
《现代电子技术》2015,(8)
随着飞机上用电设备的增多以及多电飞机概念的引入,常规配电方式及电网保护技术已经不能满足大规模用电负载的需要。电力电子技术的发展为自动配电技术提供了可能。基于固态功率控制器SSPC进行负载管理和电路保护,可根据负载控制方程自动管理负载。通过分布式配电技术实现负载就近取电,采用分层式总线布局代替传统控制线路,从而减轻了电网的重量。 相似文献
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基于SG3525A的半桥式开关电源 总被引:1,自引:1,他引:0
开关电源以其轻小高效的特点在很多方面得到了广泛应用,市场广阔。文中介绍了DC/DC变换器主电路的分类,分析了半桥型DC/DC变换器的构成,并深入分析了其工作原理、工作过程,分析总结了其相对于其他类型DC/DC变换器拓扑的优点。对开关电源的控制方式进行了比较,给出了集成控制器的优点,同时给出了电压型集成控制器SG3525A的内部结构、管脚功能,详细分析其工作原理、应用和优点。设计了一款基于SG3525A的半桥式开关电源,给出其工作原理、过程,尤其深入分析了由SG3525A构成的控制电路;实验结果表明,该电源具有效率高、电压调整率和负载调整率高、稳定可靠等优点。 相似文献
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Hamid Helalian Ghasem Pasandi Shahin Jafarabadi Ashtiani 《International Journal of Electronics》2013,100(5):761-774
In this paper, a robust low quiescent current complementary metal-oxide semiconductor (CMOS) power receiver for wireless power transmission is presented. This power receiver consists of three main parts including rectifier, switch capacitor DC–DC converter and low-dropout regulator (LDO) without output capacitor. The switch capacitor DC–DC converter has variable conversion ratios and synchronous controller that lets the DC–DC converter to switch among five different conversion ratios to prevent output voltage drop and LDO regulator efficiency reduction. For all ranges of output current (0–10 mA), the voltage regulator is compensated and is stable. Voltage regulator stabilisation does not need the off-chip capacitor. In addition, a novel adaptive biasing frequency compensation method for low dropout voltage regulator is proposed in this paper. This method provides essential minimum current for compensation and reduces the quiescent current more effectively. The power receiver was designed in a 180-nm industrial CMOS technology, and the voltage range of the input is from 0.8 to 2 V, while the voltage range of the output is from 1.2 to 1.75 V, with a maximum load current of 10 mA, the unregulated efficiency of 79.2%, and the regulated efficiency of 64.4%. 相似文献
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Nagi Reddy B O. Chandra Sekhar M. Ramamoorty 《International Journal of Electronics》2019,106(8):1164-1183
A single-stage single-switch AC–DC integrated converter is proposed in this paper, as a tight DC voltage regulator with unity input power factor for the fundamental component of the input current. Proposed converter is formed by the integration of buck-boost configuration with a buck converter operated by a single switch. The buck-boost section of the proposed configuration is operated in current discontinuous conduction mode (DCM) to get unity input power factor at the supply terminals and the buck section is operated up to boundary current conduction mode (BCM). The features acquired by the converter operating in complete discontinuous conduction mode (DCM) are unity input power factor, zero-current turn-ON for the Switch, fast and good DC output voltage regulation with extensive conversion range and low voltage stress on the switch. Additionally, the intermediate capacitor voltage stress is independent of converter load variations and so the switch also is subjected to constant peak voltage stress. A comprehensive study is carried out to obtain the necessary design equations. A design model is implemented using simulation and hardware. The results confirm the performance of the proposed configuration. 相似文献
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为给被测试的光伏逆变器提供一个测试其最大功率点性能的环境,设计了一种光伏模拟电源。其主要由整流滤波电路和DC/DC电源组成。整流滤波电路将交流电变成直流,开关电源部分完成降压功能,通过将输出电压采样送入误差比较器中与控制器RAM中的电压进行比较,来控制输出电流和电压,使其工作在对应的I-V曲线上。文中设计的光伏模拟电源可人为地输入温度和日照来模拟太阳能光伏曲线。 相似文献
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The analysis and design of a high-frequency forward DC/DC power converter topology with transformer flux balancing capability is presented. The converter utilizes a main switch for load current commutation and an auxiliary switch for transformer flux balancing. Moreover, the converter topology provides the means to recover the energy associated with the parasitic inductances of the circuit components, thus yielding high efficiency and allowing for high operating frequencies. Experimental results for a 1 kW, 20 kHz prototype unit are presented 相似文献