一系列新的基于电流模式的二阶滤波器

本文提出了一种新的基于电流模式的二阶滤波器综合电路，适当选择电路元件，可综合出一系列电流模式二阶低通、高通和带通滤波电路，对其中部分电路进行了理论设计和灵敏度分析，结果表明本文提出的电路灵敏度低、增益可独立调节。计算机仿真结果证实了理论分析的正确性。     

基于MCCⅡ的三输入单输出二阶电流滤波器

提出了三输入单源通用电流滤波电路。该电路能实现二阶低通，高通带通，全通，陷波滤波功能，具有高输出阻抗，低无源灵敏度特性，电路中所有电阻，电容接地，适于集成。     

基于MOCCII多功能滤波器的设计

简要介绍了Multiple-output CCII(简称MOCCII）器件的电路特性，提出了一个新颖的基于MOCCII多功能滤波器的电路，该电路同时实现一阶低通以及二阶低通，高通，带阻、全通和带通等滤波器功能，该电路具有很低的灵敏度，并且，电路还具有固有频率f0与品质因数Q独立可调，所有RC元件均接地，便于集成等优点。     

基于OTRA的电压模式全集成连续时间滤波器

用MOS电阻电路，给出了适于全集成的OTRA-MOSFET比例运算电路和OTRA-MOSFET-C无损和有损积分器。这些电路能减小寄生电容的影响，且其带宽与闭环增益无关。由此构造了两种新型全集成连续时间二阶滤波电路，可获得低通、带通或低通、带通和高通输出。该电路结构简单，便于电控调谐。     

基于MOCCⅡ多功能滤波器的设计

本文简要介绍了Mulitple-output CCⅡ（简称MOCCⅡ）器件的电路特性，提出了一个新颖的基于MOCCⅡ多功能滤波器的电路。该电路可同时实现一阶低通以及二阶低通、高通、带阻、全通和带通等输出。经分析，该电路具有很低的灵敏度。电路中所有RC元件均接地，便于集成等优点。     

跳耦结构差分式连续时间电流模式电流镜滤波器

在差分式电流模式电流镜积分器的基础上，提出了一个跳耦结构差分式连续时间电流模式五阶切比雪夫低通滤皮器的电流镜电路和设计方案。讨论了电流模式跳耦结构滤波器的设计方法，给出了所提出的滤波器电路的设计机仿真结果。该滤波器电路继承了电流镜电路、差分式电路、跳耦结构滤波器的优点，具有适于低电太供电、消除偶次谐波、元件灵敏度低、传递函数失真小等特点。     

单OTA二阶滤波器设计

本文提出了采用OTA实现二阶滤波器的新电路，采用单OTA和若干无源元件实现了二阶低通、带和高通滤波器，所有电路都具有低灵敏度。     

低功率电路的确定

文章探讨了确定低功率电路的三种方法(可变电阻器法、计算法、EDA法)及每种方法的优缺点，并运用计算法对两种基本电路进行分析，给出了可变电阻消耗功率最大的条件和简化分析低功率电路的方法。     

电流模式多功能二阶滤波器

提出了用改进的电流传送器实现电流模式二阶滤波器的通用电路，该通用电路在不同的输出端上获得了二阶带通、低通、高通、隐波滤波等多滤波功能。电路的品质因素ＱＰ和截止频率ωＰ独立可调，理论分析和计算机信真表明电路是可行的、正确的，且具有低的无源灵敏度。     

用单CCI的电流型滤波器实现

文中提出了实现高输出阻抗的电流模式单ＣＣＩ滤波器的新电路，它能实现二阶低通、高通、带通、全通、陷波和一阶低通、高通、全通滤波功能。给出了部分电路的ＳＰＩＣＥ仿真结果，进一步证实了理论分析的正确性。电路的品质因素Ｑ和中心频率ω０对ＣＣＩ的电流和电压偏差不敏感同时电路具有低的无源灵敏度。     

A zero-voltage-switched PWM boost converter with an energyfeedforward auxiliary circuit

A zero-voltage-switched (ZVS) pulsewidth-modulated (PWM) boost converter with an energy feedforward auxiliary circuit is proposed in this paper. The auxiliary circuit, which is a resonant circuit consisting of a switch and passive components, ensures that the converter's main switch and boost diode operate with soft switching. This converter can function with PWM control because the auxiliary resonant circuit operates for a small fraction of the switching cycle. Since the auxiliary circuit is a resonant circuit, the auxiliary switch itself has both a soft turn on and turn off, resulting in reduced switching losses and electromagnetic interference (EMI). This is unlike other proposed ZVS boost converters with auxiliary circuits where the auxiliary switch has a hard turn off. Peak switch stresses are only slightly higher than those found in a conventional PWM boost converter because part of the energy that would otherwise circulate in the auxiliary circuit and drastically increase peak switch stresses is fed to the load. In this paper, the operation of the converter is explained and analyzed, design guidelines are given, and experimental results obtained from a prototype are presented. The proposed converter is found to be about 2%-3% more efficient than the conventional PWM boost converter     

软开关隔离型升压DC-DC变换器设计与实现

为了满足升压型变换器低成本和大功率密度的需求,本文提出了一种软开关单极隔离型DC-DC变换器。该变换器电路包含一个无损耗缓冲器,通过漏电感固定住开关的电压峰值,从而实现开关的ZVS关断。在失谐状态下,使用Lr-Cr串联谐振电路来实现二极管的ZCS关断。由于磁化电流低,相较于传统的基于反激的变换器,变压器的容量更少。在输出功率250W和开关频率100kHz的条件下进行了实际测试,提出的变换器的最大测量效率为97.0%。     

A feedback loop regulated bootstrap driver circuit with improved drive capability for high voltage buck DC–DC converter

A novel bootstrap driver circuit applied to high voltage buck DC–DC converter is proposed. The gate driver voltage of the high side switch is regulated by a feedback loop to obtain accurate and stable bootstrapped voltage. The charging current of bootstrap capacitor is provided by the input power of the DC–DC converter directly instead of internal low voltage power source, so larger driver capability of the proposed circuit can be achieved. The bootstrap driver circuit starts to charge the bootstrap capacitor before the switch node SW drop to zero voltage at high-side switch off-time. Thus inadequate bootstrap voltage is avoided. The proposed circuit has been implemented in a high voltage buck DC–DC converter with 0.6 µm 40 V CDMOS process. The experimental results show that the bootstrap driver circuit provides 5 V stable bootstrap voltage with higher drive capability to drive high side switch. The proposed circuit is suitable for high voltage, large current buck DC–DC converter.     

On-chip CMOS current-sensing circuit for DC-DC buck converter

An on-chip CMOS current-sensing circuit for a DC-DC buck converter is presented. The circuit can measure the inductor current through sensing the voltage of the switch node during the converter on-state. By matching the MOSFETs, the achieved sense ratio is almost independent of temperature, model and supply voltage. The proposed circuit is suitable for low power DC-DC applications with high load current.     

Current-source parallel-resonant DC/DC converter

This paper introduces, analyzes, and experimentally verifies a novel DC/DC converter called the current-source parallel-resonant converter. The converter consists of a large choke inductor, two switches, and a parallel-resonant circuit. Each switch consists of a MOSFET in series with a diode. It has a nonpulsating input current with a very low AC ripple. The MOSFETs are driven with respect to ground and, therefore, have a simple gate-drive circuit. The analysis of the converter is carried out in the frequency domain using Fourier series techniques. Analytical expressions are derived for performance parameters of the converter. A prototype of the converter circuit was designed, built, and tested. The theoretical results were in good agreement with the experimental results     

负载并联LLC变换器的研究

随着电子产品越来越趋于高频化、模块化和集成化,小体积和高效性及低电磁干扰（EMI）成为研究的主要课题。因此,LLC变换器在高频开关电源领域得到快速的发展应用。为了提高电路的功率转换效率,文中设计了负载并联变换器。单一的输出负载浪费了电路的转换功率,而负载并联LLC变换器通过负载输出模块的并联,大大提高了电路的功率效率。通过Saber和Simplorer仿真软件进行仿真,得出该LLC变换器在不同负载和输入电压变化的情况下,能保持稳定的输出特性和良好的调节功能,而且开关管和二极管可以实现相应的ZVS和ZCS,验证了理论的正确和可行性。     

分段式电流舵 D/A转换器抗di/dt噪声设计

设计了一个8位50MHzD/A转换器(DAC),采用5+3分段式电流舵差分输出结构,其中高5位采用温度计码方式译码,低3位采用二进制译码方式;从各电路模块设计结构上提高DAC抗di/dt噪声的能力;设计了一个低交叉点开关驱动电路,有效地降低了输出毛刺,减小了数字电路di/dt噪声的影响。采用VIS0.35μmCMOS工艺进行仿真,结果表明,微分非线性(DNL)和积分非线性(INL)均小于0.15LSB。     

一种新型阴极防腐特种电源

提出一种适用于油气集输管线阴极防腐保护特种电源的新型功率变换器,对其工作原理做了详细讨论,结合具体应用实例阐述一种简单实用的脉冲频率控制方法,给出了该恒电位仪的有关实验波形和输出外特性曲线.研制结果表明,采用零电流功率开关有利于降低开关损耗和提高变换器的容量与效率.     

High-power-factor soft-switched boost converter

A novel implementation of the high-power-factor (HPF) boost converter with active snubber is described. The snubber circuit reduces the reverse-recovery-related losses of the rectifier and also provides zero-voltage switching for the boost switch and zero-current switching for the auxiliary switch. The performance of the proposed approach was evaluated on an 80-kHz, 1.5-kW, universal-line range, HPF boost converter. The proposed technique improves the efficiency by approximately 2% at full load and low line.     

一种新型单管软开关Boost变换器及其EMI研究

分析了一种用于传统Boost变换器的软开关方案。电路中只使用了一个开关管以及最少的元件，但却获得了开关器件零电流开通和零电压关断的效果。文中通过仿真描述了这一电路的运行特点，同时还分析了其与传统硬开关Boost电路的EMI状况差异以及门控电路对该变换器EMI状况的改善效果。