共查询到20条相似文献,搜索用时 125 毫秒
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《电子技术与软件工程》2015,(16)
基于小功率直流传动系统要求驱动电源输出稳定、抗干扰强的特点,设计了一种多路输出型的单端反激式开关电源。主电路采用多路输出单端反激式变换器结构,并采用软启动回路,防止负载电流或电源输入电流的大电流损坏开关电源,同时设计了过压、欠压等保护等辅助电路,完整地构建了开关电源的电路系统。 相似文献
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大功率LED恒流驱动电源设计 总被引:1,自引:3,他引:1
为了驱动高功率LED,设计了一种基于隔离反激式原理的恒流驱动开关电源。该设计主要包括反激式开关电源电路的设计、开关电源变压器的选择和设计、功率因数校正电路的设计以及相关的各种保护电路的设计。综合考虑EMI和散热问题,对该电源进行了恰当的PCB设计并完成了实物制作,对该电源进行了输出测试和功率因数测试实验,实验结果表明该电源功率输出稳定,输出电压为41.8V,电流为338mA功率因数为0.86,并成功点亮了12个1 W的大功率LED。该设计对大功率LED的应用具有一定的参考价值。 相似文献
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频率计算法设计RCC开关电源 总被引:1,自引:1,他引:0
RCC称为自激式反激变换器,是中小功率开关电源最常用的设计方式之一。但设计RCC开关电源时,因各参数的互相影响,使计算、调试复杂。而传统的预选频率,后进行AP校验法需多次计算,所设计的系统难于工作在最佳状态。在开关电源设计中变压器设计是重点,变压器设计最重要的参考量是工作频率。若能预先计算出电源工作频率,或至少确定影响频率的因素,将大大减少计算和调试的时间。首先推导出频率计算公式,确定频率主要与初、次级电感量和输入电压的关系,并进一步确定变压器参数,最终确定电源的其他参数。最后通过对电源硬件的简单调试,验证设计的合理性。 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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Switched mode power supplies (SMPS) with multiple outputs are commonly used for powering up personal computers and many other consumer electronic appliances. Multiple output SMPS circuits normally employ several DC/DC converters for regulating the voltage in each of the outputs. In this paper, a single single ended primary inductance converter (SEPIC) is used to obtain multiple isolated and regulated DC outputs from a single unregulated DC input, so that the reliability and cost effectiveness of the system can be enhanced. Considering that a large number of SMPS are being used in various applications, it is essential to maintain good power quality at the AC mains side of the SMPS circuit adhering to the international standards. Average current control mode has been used in this paper to achieve unity power factor and sinusoidal current at the input side. A novel weighted error approach has been proposed to achieve excellent voltage regulation at all the outputs of the SMPS irrespective of the load variations and input supply fluctuations. The proposed system has been designed and simulated in a PSIM environment and implemented in hardware. The results obtained show an enhanced performance of the power supply in terms of its output voltage regulation and input power quality. 相似文献
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文中在简单介绍高频开关电源的工作原理基础上,以通信用-48V开关电源为功率转换部分,89C51单片机为控制核心,对开关电源的控制部分进行优化设计,详细阐述了其工作原理,并通过软件编程实现了对开关电源的智能控制? 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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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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Fault localization of a switched mode power supply based on extended integer-coded dictionary method
Switched mode power supply (SMPS) is widely used in various industrial fields. Due to the complex operational condition, various faults may occur in the SMPS. Localizing the faults efficiently is necessary for the SMPS. Based on the classical integer-coded dictionary (ICD) method, which has been widely used in board-level analog circuits fault localization, this paper presents an extended ICD method to solve the fault localization problem in SMPS. An optimal boundary determination method is adopted in the extended ICD, which can improve the separating ability of each feature. In the paper, faults in SMPS, the available test points as well as the experimental setup are introduced first. Then, the extended ICD method is presented. Finally, the developed method is applied in the SMPS, and the test result shows eight fault states can be isolated only using six features with an accuracy of 92.5%. 相似文献