智能型低浓度瓦斯报警器

智能低浓度瓦斯报警器采用单片机和高集成数字化电路，结构简单，性能可靠。新型热催化元件提高了电路稳定性和精确度；实现了红外遥控调校电路零点、灵敏度、报警点和增加了传感器断电控制功能。采用新型开关电源，降低了整机功耗，增加了仪器传输距离。     

基于TOPSwitch-II的单片开关电源设计

TOPSwich-II器件为三端单片开关电源,是一种将PWM和MOSFET合二为一的新型集成芯片。与普通线性稳压电源相比其优点为体积小、重量轻,并且密度高、价格低;采用它制作高频开关电源,不仅简化了电路,同时可以改善电源的电磁兼容性能,且降低了制作成本。文章介绍了基于TOPSwitch-II单片开关电源的设计方法,实现了用于某温控仪表的四路输出开关电源。     

单片集成精密开关电源模块的设计

单片开关电源是一种新型高集成度、高性价比的开关电源集成的电路。文中介绍其性能特点,以及由它构成的精密开关电源模块的电路设计。     

基于TOPSwitch-Ⅱ的单片开关电源设计

TOPSwich-Ⅱ器件为三端单片开关电源,是一种将PWM和MOSFET合二为一的新型集成芯片.与普通线性稳压电源相比其优点为体积小、重量轻,并且密度高、价格低;采用它制作高频开关电源,不仅简化了电路,同时可以改善电源的电磁兼容性能,且降低了制作成本.文章介绍了基于TOPSwiteh-Ⅱ单片开关电源的设计方法,实现了用于某温控仪袁的四路输出开关电源.     

新型开关电源电路在大屏幕彩电中的应用

当前在大屏幕彩色电视机中,均采用一种新型开关电源电路,这种开关电源电路设计独特、性能良好。本文以赣新牌KG-2502和     

一种基于MSP430单片机的开关电源设计

开关电源因其具有体积小、高效节能等优点而逐渐取代线性电源,成为稳压电源的发展方向。文中介绍了现有的直流开关电源的工作原理,分析了其不足之处,提出了新型的电压可调的开关电源的软硬件实现方式。在不改变电源转换电路反馈的动态性能的前提下,实现了对输出电压的可调。该电源还具有对输出的过流保护、较低的因电源温漂、时漂、元器件参数容差而造成的输出误差、较低成本、较高的输出分辨力等优点。     

新型单片开关电源的设计

介绍了反激式变换器的基本设计规则，同时以西门子TDA1683x系列电流型单片开关电源为例，介绍一种新型单片开关电源的原理和设计，该电源具有外围电路简单、温度范围宽的特点。实验结果表明该电源工作可靠、性能优良、可广泛应用于可靠性要求较高的电力电子系统中。     

FA5310/FA5311开关电源控制IC及其应用

ＦＡ５３１０／ＦＡ５３１１是日本富士电机公司推出的新型开关电源控制ＩＣ，它具有多种保护功能，且外接电路简单、应用方便。文中介绍了ＦＡ５３１０／ＦＡ５３１１开关电源控制ＩＣ的性能、特点及工作原理，并给出了它的一种具体应用电路．     

VCD机新型开关电源电路分析与检修

<正> 由美国研制生产的新型三端TOP系列开关电源专用集成块与四端光电耦合器等组成的VCD机新型开关电源,效率高、性能稳定且电路简洁,所以在VCD机(松飞98B、东鹏LHG-970A等机型)中被广泛采用。本文介绍这类新型开关电源的原理及故障检修思路。 一、TOP系列IC内部结构与性能特点 TOP系列IC外形如同三端稳压集成电路,只有三个引出脚:①脚为控制脚,②脚接地,③脚为电源输入脚,除了稳压取     

并联均流高频开关电源的研究

随着分布式电源系统的发展，开关电源并联技术的重要性日益增加。文中介绍了一种新型高频开关电源及220V／10A整流模块的实现方案。其中整流模块采用高可靠性电流型PWM整流器及全桥变换电路来分别实现三相功率因数校正和DC／DC变换，并在模块间采用最大电流自动均流法实现自主均流。     

宽输入电压降压型DC-DC转换器发展综述北大核心

电源管理芯片在电子设备系统中担负起对电能的变换、分配、检测及其他电能管理的职责，最常见的结构是线性电源和开关电源。开关电源通过控制开关管开通和关断的时间，维持稳定的输出电压，以其高效率、小型化的特点而广泛应用于几乎所有的电子设备。工业控制系统、汽车电子等领域往往存在多个电压轨，在不同工作阶段还存在输入电压瞬间大范围变换的情况，这要求其具有高输入电压的同时，还需要在一个较宽的输入范围内能够高效地给负载供电。文章围绕宽输入电压DC-DC的转换效率提升、快速响应技术及低EMI设计进行了综合阐述，并分析了学术界和业界的一些最新进展。     

开关电源技术发展综述

随着电力电子技术的迅速发展,高频开关电源已被广泛应用于计算机、通信、工业自动化和航天航空等领域。从硬开关技术、软开关技术、同步整流技术、数字控制技术、复合结构技术等开关电源的五个技术发展阶段,对高频开关电源技术的发展路径进行了阐述,总结了各种技术的特点,并展望了开关电源技术的发展方向。     

Stability in high-output-voltage push-pull current-fed converters

The relationship between the magnetizing inductances of a transformer and of a choke coil in high-voltage power supplies is studied. The analysis defines the conditions for high switching frequency and stable operation of high-voltage power supplies without power loss increases. This approach is confirmed by the implementation of a high-voltage power supply operating at 200 kHz with an efficiency of 86%     

线型调制器的充电技术

介绍了两种线型调制器中人工线充电的新技术 ,并简要分析了这两种充电电源的工作原理以及各自的性能优缺点。新型充电电源内置完善的保护电路 ,能通过反馈网络对充电电压进行精确的调节。高频开关变换器可以减小设备的体积 ,提高可靠性     

Adaptive Neuro-Wavelet Control for Switching Power Supplies

The switching power supplies can convert one level of electrical voltage into another level by switching action. They are very popular because of their high efficiency and small size. This paper proposes an adaptive neuro-wavelet (ANW) control system for the switching power supplies. In the ANW control system, a neural controller is the main controller used to mimic an ideal controller and a compensated controller is designed to recover the residual of the approximation error. In this study, an online adaptive law with a variable optimal learning-rate is derived based on the Lyapunov stability theorem, so that not only the stability of the system can be guaranteed but also the convergence of controller parameters can be speeded up. Then, the proposed ANW control system is applied to control a forward switching power supply. Experimental results show that the proposed ANW controller can achieve favorable regulation performance for the switching power supply even under input voltage and load resistance variations     

高功率激光器新型谐振变换型开关电源

采用新型谐振技术,成功地研制出激励高功率激光器的零电流开关谐振式开关电源,其工作频率为５０ｋＨｚ,功率转换效率为８２％以上,输出电流为０～８０ｍＡ连续可调,放电电流波动小于±１ｍＡ。实现了功率管的低损耗工作,无需镇流电阻实现稳定放电,使起辉电流及电流的稳定度与放电管气体浓度和气压等无关。     

An Accurate, Low-Voltage, CMOS Switching Power Supply With Adaptive On-Time Pulse-Frequency Modulation (PFM) Control

Integrated switching power supplies with multimode control are gaining popularity in state-of-the-art portable applications like cellular phones, personal digital assistants (PDAs), etc., because of their ability to adapt to various loading conditions and therefore achieve high efficiency over a wide load-current range, which is critical for extended battery life. Constant-frequency, pulsewidth modulated (PWM) switching converters, for instance, have poor light-load efficiencies because of higher switching losses while pulse-frequency modulation (PFM) control in discontinuous-conduction mode (DCM) is more efficient at light loads because the switching frequency and associated switching losses are scaled down with load current. This paper presents the design and integrated circuit prototype results of an 83% power efficient 0.5-V 50-mA CMOS PFM buck (step-down) dc-dc converter with a novel adaptive on-time scheme that generates a 27-mV output ripple voltage from a 1.4- to 4.2-V input supply (battery-compatible range). The output ripple voltage variation and steady-state accuracy of the proposed supply was 5 mV (22-27 mV) and 0.6% whereas its constant on-time counterpart was 45 mV (10-55 mV) and 3.6%, respectively. The proposed control scheme provides an accurate power supply while achieving 2%-10% higher power efficiency than conventional fixed on-time schemes with little circuit complexity added, which is critical during light-loading conditions, where quiescent current plays a pivotal role in determining efficiency and battery-life performance     

Application of harmonic balance-finite element method (HBFEM) inthe design of switching power supplies

Numerical modeling and analysis are effective techniques to assist in the design of high-frequency switching power supplies. Striving for high power densities and higher efficiencies has pushed the operating frequencies up, resulting in new circuit configurations and different component architecture. This paper presents a numerical method that is used to analyze magnetic systems for switching power supplies, in particular the switching resonant DC-DC converters. The method uses the harmonic balance technique combined with finite element methods and is referred to as the harmonic balance-finite element method (HBFEM). The HBFEM is used to solve various harmonic, eddy-current, hysteresis, and nonlinear problems applied to magnetic circuits used in switching power supplies. To evaluate the numerical results, comparisons are made with experimental results     

无Y电容开关电源的EMI抑制方法研究

在要求低漏电流的电子设备中使用的开关电源不能采用Y电容,但无Y电容的开关电源往往难以通过EMC测试。文中通过分析开关电源中造成电磁干扰问题的原因和解决方法,提出利用吸收电路来抑制无Y电容情况下开关电源的电磁干扰。测试表明,这种方法可以有效解决无Y电容的开关电源中EMI问题。     

An efficient digital sliding controller for adaptive power-supplyregulation

Proposes a digital controller for adaptive power-supply regulation that uses sliding control, which is a widely used technique in switching power supplies for its fast transient response and robust stability. A novel reformulation of the sliding control law enables a simple and power-efficient digital implementation. The reference circuit can be either a delay line or a ring oscillator, and the sensor circuits for both cases are discussed. The prototype chip fabricated in 0.25-μm CMOS technology demonstrates a power efficiency of 89% - 95 % over the regulated voltage range of 1.1 - 2.3 V