共查询到20条相似文献,搜索用时 46 毫秒
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Salahddine Krit Hassan Qjidaa Imad El Affar Yafrah Khadija Ziani Messghati Yassir El-Ghzizal 《半导体学报》2010,31(4)
This paper presents a novel organization of switch capacitor charge pump circuits based on voltage doubler structures. Each voltage doubler takes a DC input and outputs a doubled DC voltage. By cascading voltage doublers the output voltage increases up to 2 times. A two-phase voltage doubler and a multiphase voltage doubler structures are discussed and design considerations are presented. A simulator working in the Q-V realm was used for simplified circuit level simulation. In order to evaluate the power delivered by a charge pump, a resistive load is attached to the output of the charge pump and an equivalent capacitance is evaluated. To avoid the short circuit during switching, a clock pair generator is used to achieve multi-phase non-overlapping clock pairs.
This paper also identifies optimum loading conditions for different configurations of the charge pumps. The proposed charge-pump circuit is designed and simulated by SPICE with TSMC 0.35-μm CMOS technology and operates with a 2.7 to 3.6 V supply voltage. It has an area of 0.4 mm2; it was designed with a frequency regulation of 1 MHz and internal current mode to reduce power consumption. 相似文献
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Kwok-Wai Ma Yim-Shu Lee 《Power Electronics, IEEE Transactions on》1996,11(2):318-327
An integrated flyback power converter performing the combined functions of uninterruptible power supply (UPS) and switch-mode power supply (SMPS) is presented. This power converter has a high voltage main power input and a low voltage backup battery input. DC output is obtained from the main input via a flyback power converter during normal operation and from the backup battery via another flyback power converter when input power fails. High conversion efficiency is achieved in normal, backup, and charging modes as there is only a single DC-DC conversion in each mode. The power converter circuit is very simple, with two switching transistors, a relay for mode switching, and a single magnetic structure only. This new design offers substantial improvement in efficiency, size, and cost over the conventional cascade of UPS and SMPS due to single voltage conversion, high frequency switching, and removal of design redundancy. The operation, design, analysis, and experimental results of the power converter are presented 相似文献
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为提高开关电源控制芯片使用灵活性,优化对开关电源效率、纹波等性能的控制,并方便噪声滤除,提出一种带锁相环的多模式时钟发生电路芯片的设计。该电路可提供选择1.7MHz或2.6MHz的固定频率模式或锁相范围500kHz~3MHz的外部输入模式,应用于开关电源控制芯片时,可根据开关电源的应用情况设置工作频率,达到性能最佳化。该芯片已在1.5μmBCD(Bipolar-CMOS-DMOS)工艺下设计完成。测试结果表明芯片工作正常,预期的功能均已实现,可作为模拟电路IP使用。 相似文献
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针对脉冲频率调制(PFM)开关电源(SMPS)集成电路,提出了抗电磁干扰(EMI)设计的两种方法.通过采用零电流检测电路,控制开关电源集成电路中的开关金属氧化物半导体场效应晶体管(MOSFET)在第一个谷底导通,从而降低导通电流的尖峰值.通过采用恒压和恒流设计技术,使开关电源集成电路中的电压和电流得到限制,有助于降低电流纹波.采用CSMC lμm 40 V高压工艺设计了PFM开关电源集成电路SX1618,将以上两种抗电磁干扰设计方法应用在该电路的设计中,并设计了针对性的保护结构.完成SX1618整体仿真和版图设计后进行了流片和封装,并将其应用在实际的开关电源中,经测试,开关电源的抗电磁干扰能力符合标准. 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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分析了Sepic和Flyback拓扑结构,根据DC/DC模块电源对辅助电源的需求,提出了Sepic和Flyback混合拓扑的辅助电源,能够输出多路不同幅值电压,并且可以实现各路输出电压之间的隔离。利用状态空间平均法建立了Sepic拓扑的小信号模型,设计了电压和电流双环控制的补偿器,并用Matlab仿真软件进行了分析。该辅助电源应用于一款非隔离的宽范围输入且输出可调的DC/DC模块电源,实现了三路互相隔离的12 V输出电压,一路非隔离的6 V输出电压,输出电压波形稳定,能够满足隔离悬浮供电,也能满足不同芯片对电压范围的要求。 相似文献
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In order to comply with the standards, the input current of the switch mode power supplies (SMPS) must be almost sinusoidal, i.e. the SMPS must achieve power factor correction. This requirement is normally reached with the use of an additional input converter, typically a boost, resulting in a two-stage SMPS with the inherent drawbacks: high cost and the necessity of high efficiency in each stageto obtain a reasonable global efficiency. This article introduces two simple techniques together with the control strategies that can be used to obtain single-stage SMPS, that allow the control of the output voltage and the sinusoidal input current wave shaping, without any additional stage. Another objective of this article is to investigate and to evaluate the performance of each topology that emerged from the chosen technique. Considering high-power applications, experimental results of two single-stage full-bridge topologies are also presented, in order to verify the concepts introduced in the article. 相似文献
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设计了一种基于UC3844的反激式多路输出开关电源,采用工业上常用的DC12~18 V输入,输出2路24 V/300 mA。此开关电源充分利用高频变压器原边绕组特性,把反馈绕组与供电绕组合二为一,简化了外围硬件电路,同时充分考虑了其成本和体积大小,除消除高频杂波用的共模电感、功率电阻、输出整流二极管及滤波电解电容外,其余元器件均采用贴片,最后经实验进一步测试并验证了此开关电源稳定且可靠。 相似文献
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针对太阳能光伏及燃料电池等领域电源需要较宽输入电压范围的需求,提出一种通用的具有较宽输入电压范围的软开关电流型DC/DC转换器。该转换器采用了固定频率混合调制设计,可以在所有工作条件下实现半导体器件的软开关工作,并采用电流馈电技术以便适用于低电压高电流的电源。相较于传统转换器,该转换器更为通用,能够实现零电压开关和零电流开关,并且能够在输入电压和负载变化出现较大变化时控制输出电压。实验结果显示,在20-60V输入电压范围内且负载出现变化时,该转换器均表现出良好的性能。 相似文献
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为了解决航天器DC/DC变换器高压输入多路输出时,开关管电压应力以及多路输出稳定度问题,设计了一种基于UC1845的多路输出双管反激开关电源。主电路采用双管反激式变换器,使主开关管上的电压应力仅为输入电压Vin,满足航天器高可靠性的应用需求;同时电路采用磁隔离反馈稳压控制,通过一个反馈控制量实现多路输出,输出端配合应用低压差三端稳压器,各路输出负载稳定度优于±1%。控制电路采用电流型控制器UC1845,其具有电压调整率高、负载调整率高和瞬态响应快等优点。实验结果表明,该电源安全可靠、稳定性好、纹波小、效率高,达到了设计要求。 相似文献
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In this paper, a wide input range multiple output flyback switch-mode power supply (SMPS) with its design aspects is presented. The implemented SMPS is intended to be used in various applications in industry requiring low power and operating under wide input voltage fluctuations. The SMPS is designed using TOPSwitch off-line switched integrated circuit and includes line protection, input filter, rectifier, switching control, output rectification and feedback circuitries. A 5 Watt prototype has been manufactured and is validated through measurements. Experimental results obtained from evaluation tests demonstrate distinct features like wide input range, multiple regulated output voltages, isolation and high efficiency. Technology challenges for the full integration of the presented SMPS are briefly discussed. 相似文献
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传统二极管不控整流或晶闸管相控整流,对电网注入大量谐波及无功功率,造成电源污染.PWM整流器采用全控型开关器件取代二极管或半控型器件,并将PWM控制技术引入整流器,在稳定直流电压输出同时,使交流侧电源电流接近正弦波,实现能量的双向流动.通过介绍单相PWM整流器的控制方法,利用Matlab/Simulink搭建仿真模型,比较分析不同控制方式下PWM整流器运行时电压波形及输入电流的谐波频谱. 相似文献
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KR-200T型高频开关电源的研制 总被引:1,自引:0,他引:1
为了满足通信系统对于200W三输出特殊规格开关电源的需要,研制成功了一款基于正激变换的KR-200T型高性能开关电源。文中对该研究成果作了基本总结,内容包括:该电源的技术规格、工作原理、元件选择、控制电路设计和测试结果等。 相似文献
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设计了一种在供电电源电压稍高于MOS管阀值的超低压条件下就能正常工作的宽输入电压范围的DC/DC变换器。电荷泵的启动模块和Boost升压模块集成于同一芯片中,在电压低于2.2V(typical)时,芯片包括两部分的工作过程,首先由电荷泵的启动模块使电压升高至2.2V,然后由输出电压为Boost转换器模块供电,使芯片正常工作。输入电压高于2.2V时,只有Boost模块工作。为使芯片实现高效率的转换,在轻载情况下,采用PFM调制模式;在重载情况下,采用PWM调制模式;通过逻辑控制两种模式自动切换,实现了良好的负载调整率。芯片采用SMIC 0.5um CMOS工艺设计并流片测试,在0.83V的电源电压时,芯片能正常启动工作。在电压VIN=1.2V,VOUT=3.3V时,最大效率达到87%,所有电压和负载范围内效率不低于50%。该芯片可用于单电池供电的系统中。 相似文献
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Many architectures have been proposed for rank order and stack filtering. To achieve additional speedup in these structures requires the use of parallel processing techniques such as pipelining and block processing. Pipelining is well understood but few block architectures have been developed for rank order and stack filtering. Block processing is essential for additional speedup when the original architecture has reached the throughput limits caused by the underlying technology. A trivial block structure simply repeats a single input, single output structure to generate a multiple input, multiple output structure. Therefore the architecture can achieve speedups equal to the number of multiple outputs or the block size. However, unlike linear filters, the rank order and stack filter outputs are calculated using comparisons. It is possible to share these comparisons within the block structure and thus substantially reduce the size of the block structure. The authors introduce a systematic method for applying block processing to rank order filters and stack filters. This method takes advantage of shared comparisons within the block structure to generate a block filter with shared substructures whose complexity is reduced by up to one-third compared to the original filter structure times the block size. Furthermore, block processing is important for the generation of low power designs. A block structure can trade its increased speedup for a throughput equal to the original single output architecture but with a significantly lower power requirement. The power reduction in the trivial block structures is limited by the power supply voltage. They demonstrate how block structures with shared substructures allow them to continue decreasing the power consumption beyond the limit imposed by the supply voltage 相似文献
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介绍一种利用低电压普通集成稳压器LM317精密稳压的150V直流稳压电路,电路采用两个NPN晶体管实现了LM317输入、输出端之间的限压、稳压和输入端的限流,电路结构简单,工作可靠,并且具有较高的稳压精度。 相似文献