ToPSwitch组成的单端反激式开关电源

本文简述了ToPSwitch组成的单端反激式开关电源。     

基于TOP243Y的多路输出开关电源高频变压器的优化设计

以TOP243Y为控制芯片构成的多路输出反激式开关电源,具有体积小、集成度高、功能强等优点,其中高频变压器的设计计算对多路输出开关电源的整体性能影响较大。在设计计算的基础上应用PI公司PIXls Designer 8软件对变压器参数进行优化可以达到提高电压准确度、减小纹波的效果。从实验数据和波形看出,该开关电源的稳压性、电磁兼容性均良好,达到了设计要求。     

基于TOP243Y的多路输出开关电源高频变压器的优化设计

以TOP243Y为控制芯片构成的多路输出反激式开关电源,具有体积小、集成度高、功能强等优点,其中高频变压器的设计计算对多路输出开关电源的整体性能影响较大。在设计计算的基础上应用PI公司PIXls Designer 8软件对变压器参数进行优化可以达到提高电压准确度、减小纹波的效果。从实验数据和波形看出,该开关电源的稳压性、电磁兼容性均良好,达到了设计要求。     

基于Saber反激式多路输出开关电源的仿真

通过使用Saber软件,搭建电路级模型,仿真研究反激式开关电源。分析反激式开关电源原理,并与试验样机对比,体现仿真对设计的指导性作用。     

装甲车车载设备绝缘电阻与开关导通状态测试仪的研发

为解决传统绝缘电阻与开关导通状态测试仪在装甲车车载电器设备检测时效率低、精度差等问题,设计基于单片机、CPLD和触摸屏的绝缘电阻与开关导通测试仪.系统具有准确迅速实现80路绝缘电阻巡回检测与80路开关导通状态判断的功能,利用TOP242构成反激式开关电源产生200 V/50 V直流测试电压,触摸屏作为人机界面,CPLD完成译码工作以控制继电器开关矩阵动作;加入低通滤波器的放大电路有效提高了系统的抗干扰性能.实验结果表明:该测试仪完全满足装甲车车载设备绝缘电阻和开关导通测试的精度要求,提高了测试效率.     

基于反激式微功率开关电源设计

本文设计并实现了一种微功率开关电源,该电源具有5V、12V双路输出,整体输出功率为5W,其拓扑结构采用反激式(Flyback)。与传统开关电源设计不同,本设计主要采用一个集成了700V的MOSFET、振荡器、频率抖动、简单的开/关控制、电流保护等功能的开关电源控制芯片LNK364,从而大大简化了开关电源的电路,并且提高了可靠性,降低产品成本。本文将结合该思路对开关电源的设计进行详细阐述,并对设计进行了实验、结果分析。     

单端反激电路在逆变电源中的应用分析

单端反激电路的结构形式多样,在其运行过程中具有稳定可靠、安全性高的特点,这使得其在一遍电源中具有广泛的应用,本文就主要对逆变电源中各种单端反激电路的结构形式及其应用进行简单分析。     

包装自动化中一种自适应可调直流电源的设计

介绍了在包装自动化中一种自适应可调制式电网的开关电源的设计.它主要是通过检测负载的电流变化,来改变PWM输出的占空比,用以驱动MOSFET管,实现恒压输出,采用改变UC3842内部集成运算放大器的基准电压来实现本电源可调的功能.另外,采用交流输入电路和整流滤波电路为反激式电路提供直流电源,在高频变压器的二次侧设置了由光电耦合器与TL431组成的保护电路,用以加强反激式自适应可调直流电源的稳定度和可靠性.     

基于Max1847的核仪器高压电源设计

根据核辐射测量设计需求,以Max1847芯片为核心,设计了一种用于核探测仪器的反激式开关高压电源.分析了反激式开关电源拓扑的工作原理,给出高压电源主电路设计及其中各个元器件的设计要点,对反激变压器关键参数进行了详细的设计,并对高压电源的主要参数进行测量,给出实验分析结果.高压电源的测试结果及实际应用表明Max1847适用于核仪器高压电源系统的设计.     

小功率通用开关电源的原理

该开关电源共选用3片主要的集成电路——TOP249Y型6端单片开关电源、线性光耦合器PC817A及可调式精密并联稳压器TL431。利用TOP249Y型6端单片开关电源的PWM技术控制开关的占空比来调整输出电压的，以达到稳定输出的目的。     

A simple accurate bridge-transducer interface with continuousautocalibration

This paper presents a one-chip simple and accurate transducer interface for resistive bridges. A key part of this interface is formed by a novel dynamic voltage divider. In this divider the bridge supply voltage is measured for reference purposes in small parts (piece-wise measurement) which are within the range of the bridge output voltage. The use of an autocalibration technique, the three-signal method, eliminates influeuce of linear parameters and errors. Moreover, the effects of the nonidealities of the applied switches are also eliminated. The circuit has been realized in a 3 μm BiCMOS process and shows an uncertainty of only 10 μV for a bridge supply voltage of 5 V     

压电陶瓷驱动电源及其在激光陀螺扫模中的应用

对压电陶瓷微位移器驱动电源与环形激光陀螺腔长调节原理进行了分析 ,在此基础上 ,设计了微机控制 0～ 30 0 V电压连续可调压电晶体驱动电源 ,并将其应用于自行设计的环形激光陀螺自动扫模系统。实验获得的扫模曲线表明 ,该驱动电源能够满足环形激光陀螺扫模系统的要求     

强电磁干扰环境下的爆炸容器动态应变测试系统

根据爆炸容器的具体物理及力学结构特点．建立了一套基于ISA总线和Top View 2000软件的爆炸容器动态应变虚拟仪器测试系统,运用应变计的双片重叠安装、密封屏蔽接线和隔离电源等综合技术实现了强电磁干扰环境下的动态应变精密测量．     

Low-sensitivity, low-bounce, high-linearity current-controlled oscillator suitable for single-supply mixed-mode instrumentation system

A low-sensitivity, low-bounce, high-linearity current-controlled oscillator (CCO) suitable for a single-supply mixed-mode instrumentation system is designed and proposed in this paper. The designed CCO can be operated at low voltage (2 V). The power bounce and ground bounce generated by this CCO is less than 7 mV_pp when the power-line parasitic inductance is increased to 100 nH to demonstrate the effect of power bounce and ground bounce. The power supply noise caused by the proposed CCO is less than 0.35% in reference to the 2 V supply voltage. The average conversion ratio K_CCO is equal to 123.5 GHz/A. The linearity of conversion ratio is high and its tolerance is within plusmn1.2%. The sensitivity of the proposed CCO is nearly independent of the power supply voltage, which is less than a conventional current-starved oscillator. The performance of the proposed CCO has been compared with the current-starved oscillator. It is shown that the proposed CCO is suitable for single-supply mixed-mode instrumentation systems.     

三相电能表检定装置的扩展应用

近来来以16位单片为中央处理器的电参数测试仪的应用越来越广泛，其特点是数字化、测试功能多、量程范围宽、具有和计算机通讯的功能。但是计量部门原有的电三表检定装置不能满足其测试要求，我们在资金较为紧张的情况下，在三相电能表检定装置的基础上开发了一套控制程序，在它的控制下，用三相电能表检定装置来对电参数测试仪进行测试，较好地解决了这个问题。     

便携式原子力显微镜扫描驱动器的设计与实现

设计了一种便携式原子力显微镜压电陶瓷管驱动器,该驱动器使用5～12V宽幅直流电源,产生+215V和±15V的电源供给高压放大模块和信号调理模块,可将输入的-10V～+10V控制信号,放大为-200V～+200V的电压驱动压电陶瓷扫描管,功耗仅为2W左右,体积为150mm×60mm,可以使用电池供电并连续工作7～8h。该驱动器是便携式原子力显微镜的一个重要模块,该模块功能的实现使原子力显微镜在工业现场和野外环境进行测量成为可能。     

Bridge-output-to-frequency converter for smart thermal air-flowsensors

A fully integrated bridge-output-to-frequency converter has been realized as signal-conditioning circuitry for a one-chip smart thermal mass-flow sensor. The frequency converter reads out four separate resistor bridges of the air-flow sensor in order to realize high sensitivity and directional flow measurement over the full angle range of 360°. The converter selects the sensor bridges individually by means of a microprocessor-controlled analog multiplexer. The flow velocity and direction are also calculated by the microprocessor. The relative measurement cancels all first-order errors. The center frequency is 10 kHz and the sensitivity 1 Hz/(μV/V). A bridge-offset of 10 mV/V is allowed, and the linearity error is 0.1%     

Low power design of CMOS 5-GHz voltage-controlled oscillator from narrowband to wideband with switching capacitor module

In this study, we demonstrated low power and low phase noise of the complementary cross-coupled voltage-controlled oscillators (VCOs). Two chips are implemented by TSMC standard 0.18-mum complementary metal-oxide semiconductor (CMOS) process. The first one that employed a memory reduction tail transistor technique is operated from 5.17 to 5.85 GHz at a supply voltage of 1.2 V whereas its tuning range is 12.3%. The power consumption is 1.8 mW whereas the measured phase noise is -126.6 dBc/Hz at 1-MHz frequency offset from 5.17 GHz. The other employed switching capacitor modules to achieve wide tuning range and minimise phase noise, it operated from 3.64 to 5.37 GHz with 38% tuning range. The power consumption is 13.7 mW by a 1.8 V supply voltage and the measured phase noise in all tuning ranges is less than -122 dBc/Hz at 1-MHz frequency offset.     

空间离子电推进系统电源处理单元设计

空间电推进电源处理单元是组成电推进系统的关键设备之一,它是多电源组合、输出功率大、电压高及时序控制的复杂电源变换产品。以离子电推进系统配置的电源处理单元为例,叙述了输出功率为1 kW,屏栅电源输出电压达到1 000 V的各功能电源的电路设计,并给出了实验电路的测试结果。     

Portable high-voltage power supply and electrochemical detection circuits for microchip capillary electrophoresis

Miniaturized, battery-powered, high-voltage power supply, electrochemical (EC) detection, and interface circuits designed for microchip capillary electrophoresis (CE) are described. The dual source CE power supply provides +/- 1 kVDC at 380 microA and can operate continuously for 15 h without recharging. The amperometric EC detection circuit provides electrode potentials of +/-2 VDC and gains of 1, 10, and 100 nA/V. The CE power supply power is connected to the microchip through an interface circuit consisting of two miniature relays, diodes, and resistors. The microchip has equal length buffer and separation channels. This geometry allows the microchip to be controlled from only two reservoirs using fixed dc sources while providing a consistent and stable sample injection volume. The interface circuit also maintains the detection reservoir at ground potential and allows channel currents to be measured likewise. Data are recorded, and the circuits are controlled by a National Instruments signal interface card and software installed in a notebook computer. The combined size (4 in. x 6 in. x 1 in.) and weight (0.35 kg) of the circuits make them ideal for lab-on-a-chip applications. The circuits were tested electrically, by performing separations of dopamine and catechol EC and by laser-induced fluorescence visualization.