基于单片机控制的开关电源模块

传统的开关电源一般以恒流或恒压工作,不能根据负载调节输出电压或电流,本文中,我们设计了一种数字控制的开关电源模块。该电源模块是以TI公司的MSP430为控制核心,通过数字PID调节器控制反馈输出来实现的。首先介绍了该电源模块的工作原理及整体设计方案,其次介绍了部分关键电路的硬件设计,给出了主程序及部分子程序的流程图。与传统的开关电源相比,该电源模块具有体积小、精度高、电路简单、输出电压连续可调等优点。     

MnZn功率软磁铁氧体磁芯在开关电源中的应用

以天通公司生产的EC49型和ET35型磁芯在彩色电视机电源部分的应用为例，分析开关电源的工作原理及功率软磁铁氧体磁芯的主要性能对开关电源的影响。     

高斯贝尔GSR-VVD33数字卫星接收机开关电源原理与检修

在卫星数字接收机的开关电源电路中,应用较多的是电源控制集成电路,由分立元件构成的开关电源并不多见。近年来,部分数字机生产厂家为了降低成本,采用以C5027为主要元件组成的分立元件式通用型开关电源,而高斯贝尔GSR-VD33数字卫星接收机则应用了另一类由分立元件组成的开关电源,如图为高斯贝尔GSR-VD33数字卫星接收机开关电源的电原理图,现就其工作原理及常见故障做一简要分析,供参考。     

基于TOP—switch Ⅱ单端反激开关电源的建模及动态分析

分析了单端反激式开关电源的工作原理，运用动态小信号平均模型分析法，对开关电源的主电路及控制电路组成的一个闭环控制系统进行数学模型的建立，并进行动态分析，以求达到最佳的控制效果。     

基于UG3842的双折射测试仪可调直流电压源改进设计

从开关电源的思路出发,对双折射测试仪的可调直流电压电路部分进行了改进。用开关电源PWM控制芯片UC3842设计取代了原来的单管自激式直流变换器,并对差动输出电路进行了重新设计。阐述了电路工作原理,并对改进后的电压源进行了连机调试,结果性能良好。     

基于TOP249Y芯片的开关电源设计

介绍了一种采用TOP249Y智能控制集成芯片设计的开关电源的方法，同时介绍了TOE249Y芯片的内部结构及工作原理，给出了基于TOP249Y的单端反激式开关电源的设计电路，并对外围电路的设计进行了分析说明。     

P350S卫星电视接收机开关电源原理及维修

介绍了Ｐ３５０Ｓ卫星电视接收机开关电源原理，开关电源电流控制芯片ＩＰ３８４４Ｎ，着重对Ｐ３５０Ｓ开关电源的故障现象进行分析，辅以相应的维修程序及对策。     

控制电路在多路输出开关电源中的应用

介绍一种采用TOP249Y智能控制集成电路设计的开关电源。介绍TOP249Y的内部结构及工作原理，根据TOP249Y的性能特点给出单端反激式开关电源的设计方法，并对外围电路的设计进行了分析。     

广播电视全固态发射机高频开关电源原理与维修维护

本文从多年的维护实践出发,分析广播电视发射设备高频开关电源的工作原理,以及对主流PWM控制芯片的介绍,简明的概括了开关电源的分类和广播电视发射设备常用开关电源,对广播电视发射机高频开关电源维修与维护进行了总结并举例说明。     

P350S卫星电视接收机开关电源·电路介绍·原理及维修

介绍了Ｐ３５０Ｓ卫星电视接收机开关电源原理，开关电源电流控制芯片ＩＰ３８４４Ｎ，着重对Ｐ３５０Ｓ开关电源的故障现象进行分析，辅以相应的维修程序及对策。     

KR-200T型高频开关电源的研制

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。     

彩色电视机开关电源电磁干扰与抑制研究

开关电源因体积小、效率高、功率因数大等优点,被广泛使用在各种类型的电视机中,但由于本身的工作特性使得电磁干扰问题相当突出,限制了其使用。从彩色电视机开关电源电磁干扰的模型入手分析开关电源电磁干扰的干扰源、干扰途径和敏感器件的干扰问题,提出抑制彩色电视机开关电源电磁干扰的方法。     

基于TOP247Y多路隔离输出开关电源的设计

介绍了一种采用TOP247Y芯片设计的多路隔离输出开关电源。在阐述其工作原理的基础上给出了利用PI Transformer Designer软件设计变压器的方法,完成了多路隔离输出开关电源的设计,并完成了样机制作,其结构简单,操作方便。实验结果表明：该电源动态性能良好,稳定性高,可用作IPM模块的专用驱动电源以及其他外围电路工作电源。文中提供了一种高效、快捷、灵活的电源设计方案。     

A low power multiple output switch-mode power supply with wide input range

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.     

变频器电源电路维修

开关电源体积小、重量轻、效率高、动态稳压效果好。在变频器电源电路中使用UC3844为主控芯片的较多,本文简单介绍UC3844开关电源的基本原理、维修步骤和维修实例,供大家在维修时参考。     

一种带锁相环的多模式时钟发生电路设计

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。     

Accurate Extraction of Noise Source Impedance of an SMPS Under Operating Conditions

An accurate measurement method to extract the common mode (CM) and the differential mode (DM) noise source impedances of a switched-mode power supply (SMPS) under its operating condition is developed and validated. With a proper premeasurement calibration process, the proposed method allows extraction of both the CM and the DM noise source impedances with very good accuracy. These noise source impedances come in handy to design an electromagnetic interference filter for an SMPS systematically with minimum hassle.      

The application of the duality principle to nonplanar circuits

It is shown how the duality principle can be applied to nonplanar circuits such as three-phase bridge converters and their loads. While the direct duals have restricted utility, they provide some insight into the formation of three-phase conversion circuits that ultimately allow several new converters to be developed. These include new frequency converters, a three phase sinusoidal input current, switched-mode power supply (SMPS), and an SMPS with a three-phase high-frequency link. Some current techniques and supporting simulation results are presented     

A simple control technique for single-SEPIC converter based multiple output SMPS with fully regulated and isolated outputs

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.     

Techniques to obtain single-stage power supplies with power factor correction (PFC)

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.