基于Saber的反激式开关电源的仿真研究

反激式开关电源因成本低、外围元器件少、可宽电压范围输入能耗小、支持多组输出而备受欢迎,但因输出电压纹波大而严重影响其工作性能。从反激式开关电源的工作原理出发,采用反激式开关电源输出端增加输出滤波电路的方法,解决反激式开关电源输出电压纹波大的问题。运用Saber仿真软件分别对普通反激式开关电源和增加 输出滤波电路的反激式开关电源进行建模和仿真。试验仿真对比表明,通过该方法可改善反激式开关电源的输出电压纹波,提高了反激式开关电源的工作性能。     

一种自激式高压开关电源的设计

开关电源是高效节能型电源,在多种电子电气类产品中得到广泛应用,并展现了其良好的工作特性。文中设计了一款小功率开关电源,采用了自激式工作方式,该电路结构简单,对输入电压的变化有较好的适应能力,输出纹波低,电源体积小。     

电源变换器原理及应用（续一）

电源变换器原理及应用（续一）西安通信学院王鸿麟陕西科技出版社张敏３、开关电源虽然线性电源有许多较好的特性，如线路简单、输出纹波和噪声较低、电源调整率和电压调整率较高、瞬变恢复时间短等，但是，线性电源的效率太低。３．１开关电源与线性电源比较由于开关电源...     

正激DC—DC开关电源环路补偿器的设计

负反馈环是所有线性电源和开关电源的核心部分,它使电源的输出电压保持恒定。为了实现这一功能,采用误差放大补偿器减小输出电压纹波。本文简单介绍了在不同类型电源情况下选用不同类型的补偿器,以及各种补偿器的优点比较,并针对正激DC-DC开关电源环路补偿的设计举例说明并计算。     

基于软开关的开关电路EMC研究

应用软开关技术对开关电源的功率电路进行了仿真分析,结果证明该技术可以抑制电路的电磁干扰,减小输出纹波电压,从而得到高精度、高稳定度的输出电压,为开关电源的电磁兼容设计提供了新的研究方向.     

开关电源纹波抑制研究

提出开关电源纹波的定义,分析开关电源纹波产生的原因,并提出几种抑制纹波的方法。最后针对一款特殊开关电源,论述了开关电源的输出稳定性问题。该电源输出电流为10A,输出电压为12V,主要用于驱动半导体激光器。为减小输出电流纹波,提高激光功率稳定性,研究分析了几种抑制纹波的方法,包括滤波法,多路叠加法等。该电源的设计采用主、副电源的思路,从主电源采集纹波信号反馈给副电源的控制端,从而使主副电源输出叠加后保持较小的输出纹波。通过实验验证该方法可以使纹波系数保持在1%,使得性能有所提高。     

基于TOP250Y的单片反激电源设计

TOPSwitch系列集成芯片的应用是新一代开关电源设计的重要特点和趋势.文中介绍了一种采用TOP250Y集成芯片实现的开关电源.根据T0P250Y的特性给出了单端反激式开关电源的工程设计方法,对外围电路的设计进行了分析.最后,给出了实验结果,实验表明,该电源具有效率高、纹波小、输出电压稳定等优点.     

某型无人机电源滤波系统的设计

针对无人机电源系统对输出电压纹波和噪声的特性要求,设计了以两级LC滤波器为核心的正激电源滤波系统。仿真和实验结果表明,系统输出电压稳定、噪声低、纹波小。该电源系统已投入无人机航磁探测野外实验中,运行可靠、效果良好。     

一种带纹波补偿的高精度PMT直流高压开关电源

采用一种纹波补偿电路使光电倍增管(PMT)直流高压开关电源的输出纹波幅度大大降低,同时对低频电压漂移也有很好的补偿效果.分析了基于信号交流分量反相叠加的纹波补偿工作原理,设计了纹波补偿电路.对不同频率、不同波形的纹波进行软件仿真,结果表明纹波衰减达40 dB以上,低频电压漂移降低了2个数量级.     

基于UC3843反激式开关电源的设计

单端反激开关电源具有输出纹波小、输出稳定、体积小、重量轻、效率高以及良好的动态响应性能等许多优点,被广泛应用在小功率开关电源的设计中。文中首先对UC3843芯片做了简单的介绍,描述了其在电路中的主要功能;设计了电路原理图,并对电路原理图进行了简单介绍;再根据反激式开关电源电路设计公式详细介绍了各部分参数,最后给出了电路的测试结果。实验表明,该开关电源输出电压平稳,性能稳定。     

直流微网母线电压纹波集中补偿自寻优策略

为抑制直流微网母线电压二次纹波,文中提出了一种直流有源滤波器集中补偿自寻优策略。在双向DC/DC变换器电压/电流双闭环控制的基础上,加入直流母线电压纹波控制,通过引入带通滤波器消除了传统控制方法中采用低通滤波器提取纹波时所产生的相位滞后问题。采用迭代自寻优方法获取重要控制参数阻抗系数K,实现直流有源滤波器对直流母线电压纹波变化的实时跟踪和集中补偿。在MATLAB/Simulink中搭建了含互联接口变流器、分布式电源、直流负荷、由DC/AC变流器接入的交流负荷以及直流有源滤波器的直流微网模型,建立了相应的实验平台。仿真和实验结果均验证了所提控制策略的有效性。     

Ultrafast Tracking Power Supply With Fourth-Order Output Filter and Fixed-Frequency Hysteretic Control

A practical solution is presented for the design of a non-isolated dc/dc power converter with very low output ripple voltage and very fast output voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W output prototype, capable of delivering any voltage in the range of 10–30 V within 10 $mu{hbox {s}}$ with 10 mVpp of output ripple and efficiencies in the 88%–95% range.      

Analysis and Design of a Novel Three-Phase AC–DC Buck-Boost Converter

This paper proposes a novel three-phase ac-dc buck-boost converter. The proposed converter uses four active switches, which are driven by only one control signal. This converter is operated in discontinuous conduction mode (DCM) by using the pulsewidth modulation (PWM) technique, and the control scheme very easily and simply achieves purely sinusoidal input current, high power factor, low total harmonic distortion of the input current and step-up/down output voltage. Also, the proposed converter provides a constant average current to the output capacitor and load in each switching period. Thus, the ripple component of sixth times line frequency will not appear in the output voltage. Therefore, a smaller output capacitor can be used in the proposed converter. Moreover, the steady-state analysis of voltage gain and boundary operating condition are presented. Also, the selections of inductor, output capacitor and input filter are depicted. Finally, a prototype circuit with simple control logic is implemented to illustrate the theoretical analysis.     

采用有源电容倍增器改善开关电容DC-DC变换器的性能

研究了开关电容DC-DC变换器输出电压与电容的关系,分析了变换器输出电压波纹产生的原因.针对变换器中大电容难集成的问题,提出了一种基于跨导放大器和第二代电流传输器的有源电容倍增器的新型拓扑结构.该电路只用较少的元件就可以实现开关电容变换器中的浮地和接地电容.以二阶开关电容DC-DC变换器为例,用PSPICE软件分别对采用了有源电容倍增器的新型结构和传统结构进行了仿真.结果显示,基于有源电容倍增器的开关电容变换器仅用100pF电容就等效了200nF电容的输出性能,而且具有更低的输出电压波纹.     

Unity power factor ZVS AC-to-DC converters with an active filter

Unity power factor zero-voltage-switched (ZVS) AC-to-DC power converters with an active filter are proposed. The line voltage is supplied to AC-to-DC power converters through a rectifier circuit with an input filter, to reduce high-frequency ripple components. The line current is almost synchronized to the line voltage, due to the low impedance of the input filter. Forward ZVS multiresonant power converters (ZVS-MRCs) are utilized for high-frequency operation and lossless switching. An active filter is introduced to minimize the twice line-frequency ripple component of the output voltage without large-size passive filters. Experimental results show that the proposed scheme gives good steady-state performances of the AC-to-DC power converters     

Design and evaluation of Feedforward Active ripple filters

An active ripple filter is an electronic circuit that cancels or suppresses the ripple current and electromagnetic interference generated by the power stage of a power converter, thus reducing the passive filtration requirements. This paper explores the design of feedforward active ripple filters for current ripple cancellation, including the design tradeoffs, advantages, and limitations of different implementation methods. The design and performance of an active filter using a novel Rogowski-coil current sensor is discussed in detail. Experimental results from a prototype converter system using this approach are presented, and quantitative comparisons are made between a hybrid passive/active filter and a purely passive filter. It is demonstrated that substantial improvements in filter mass and converter transient performance are achievable using this active ripple filtering method.     

Zero-voltage-ripple rectifiers and DC/DC resonant converters

Class E zero-voltage-ripple (ZVR) rectifiers are introduced. The proposed circuits offer a new means of a significant improvement in suppressing the output voltage ripple compared with their predecessors. Therefore, the size of the output filter can be considerably reduced, the rI_rms² conduction power loss in the equivalent series resistance of the filter capacitor can be lowered, aluminum or tantalum electrolytic capacitors may be entirely eliminated, filter capacitors with low capacitances and thereby high self-resonant frequencies can be used, and a faster dynamic response becomes achievable. ZVR is accomplished by reducing the AC component of the current at the input of the output filter. Class E² and Class D-E ZVR resonant DC/DC power converters are derived using the Class E ZVR rectifiers. An experimental prototype of a Class E² 30 W/500 kHz DC/DC converter was built and tested. Its output voltage ripple was as much as 20 times lower than that of the corresponding conventional converter. The new converters are suitable for noise-sensitive high-output-current applications     

Analysis,design and implementation of an interleaved three-level PWM DC/DC ZVS converter

This paper presents a new parallel three-level soft switching pulse-width modulation (PWM) converter. The proposed converter has two circuit cells operated by the interleaved PWM modulation. Thus, the ripple currents at input and output sides are reduced. Each circuit cell has two three-level zero voltage switching circuits sharing the same power switches. Therefore, the current and power rating of the secondary side components are reduced. Current double rectifier topology is selected on the secondary side to decrease output ripple current. The main advantages of the proposed converter are soft switching of power switches, low ripple current on the output side and low-voltage rating of power switches for medium-power applications. Finally, the performance of the proposed converter is verified by experiments with 1 kW prototype circuit.     

Effects of continuous noise in randomised switching DC-DCconverters

A randomly switched DC-DC converter reduces the magnitude of discrete harmonics but creates continuous noise in the output voltage. Continuous noise within the passband of the output filter is found to induce low-frequency voltage ripple in the converter output. This adverse effect is inherent in all randomised switching schemes and is confirmed by both theory and experiment     

A novel one-stage forward-type power-factor-correction circuit

A novel power-factor-correction (PFC) circuit is proposed which is constructed with one stage by using a single forward converter. This PFC circuit has functions of high power factor and suppression of the output voltage ripple. The high power factor is accomplished by making the PFC circuit operate in the discontinuous conduction mode and the suppression of the output voltage ripple by using the exciting energy of the transformer in the forward converter