多路输出的PEMFC控制系统电源的研制

探讨一种用于PEMFC控制系统的多路输出DC/DC变换器,通过计算和仿真设计了主电路和控制电路的参数。根据所设计的电路参数,选择合适的主电路器件,控制电路采用基于DSP的全数字控制系统,研制出多路输出的PEMFC控制系统电源,并对研制的开关电源进行了性能测试,能够适应PEMFC发电机变化范围大的动态输出特性,满足控制系统的需求。     

彻底改变电源的数字控制技术

数字控制电源电路开始受到人们关注。这种电源电路是在开关电源中,采用DSP或者专用逻辑电路等以数字处理方式进行控制,从而得到稳定的输出电压和输出电流。在电源中引入数字控制技术以后,很容易设计出可以根据经常变化的系统状态,比以前更加精准地改变输出特性的电源,于是,电源     

一种适用于开关电源的内部供电电路设计

本文提出了一种适用于开关电源的内部供电电路。该电路采用齐纳二极管的稳压原理,将开关电源的高输入电压稳压输出5V,供模拟模块和数字模块使用,简化了以往采用基准和低压差线性稳压器(LDO,Low Dropout Regulator)供电的设计方法。本电路基于0.35 um BCD工艺,对所设计电路进行了仿真验证。仿真结果表明,该电路在-40℃~125℃应用环境温度范围内都能够实现高精度的输出电压,具有较强的稳定性。     

基于PWM集成控制器开关电源的设计与仿真

针对电源发展的集成化与小型化趋势,提出了一种基于TOPSwitch-GX单片开关电源的设计方法。详细分析该电源电路的外围控制电路、抗干扰电路、输出滤波电路和反馈控制电路的设计,实现了一个240 W的开关电源,这种单片开关电源电路具有结构和控制方法简单、体积小、噪音小、转换效率高等优点。     

全电动注塑机交流伺服驱动器的设计

结合全电动注塑机的特点,介绍了一种基于DSP的全电动注塑机交流伺服驱动器的控制原理、硬件组成和软件设计。控制电路采用DSP+FPGA,功率电路采用智能功率模块(IPM)+开关电源的设计方案,同时采用独立的主电源模块,实现多个功率电路共用母线电压,具有紧凑的系统结构。实验结果表明该伺服驱动器设计的有效性和可靠性,能够较好地满足对全电动注塑机控制精度和稳定性的要求。     

基于MCU控制的高压开关电源

针对压电陶瓷驱动电源的应用设计了一种基于单片机(MCU)控制的高压开关电源,实现了低压(9～18 V)输入下的高压(150 V)输出。电路主回路采用准谐振反激变换拓扑结构,MCU芯片控制脉宽调制(PWM)电源管理芯片完成变换器升压,并驱动H桥逆变电路输出频率可调的方波电压。数字控制的高压开关电源工作波形稳定,尖峰噪声小,输出电压精度高。实验结果验证了高压开关电源的性能。     

基于BUCK电路宽范围可调DC/DC电源的研究与设计

文章通过对BUCK主电路进行改进,以SG3525为主控芯片设计一种闭环控制的宽范围电压可调输出的DC/DC开关电源,使电压能够宽范围(0-98%)可调出,解决了市场上开关电源固定输出、小范围控制输出、输出效率较低等问题。     

一种DC-DC开关电源片上软启动电路

提出了一种基于DAC(digital-to-analog converter)控制的数字软启动电路,利用DAC控制和软启动电压检测技术,有效抑制了DC-DC开关电源启动过程中产生的浪涌电流和输出电压过冲,实现了输出电压从零到调整值的平坦上升.在启动完成后启动电路的偏置电流被彻底关断,实现了低功耗没计.该软启动电路采用CMOS器件设计,无需任何外围元件,便于被DC-DC开关电源集成.该电路已成功集成到一款Buck型PWM(pulse width modulation)控制器当中,测试结果表明:在整个负载范围内,DC-DC在启动过程中电感电流平稳变化,输出电压平滑上升、无过冲,启动时间控制在1.2ms.     

一种DC-DC开关电源片上软启动电路

提出了一种基于DAC(digital-to-analog converter)控制的数字软启动电路,利用DAC控制和软启动电压检测技术,有效抑制了DC-DC开关电源启动过程中产生的浪涌电流和输出电压过冲,实现了输出电压从零到调整值的平坦上升.在启动完成后启动电路的偏置电流被彻底关断,实现了低功耗没计.该软启动电路采用CMOS器件设计,无需任何外围元件,便于被DC-DC开关电源集成.该电路已成功集成到一款Buck型PWM(pulse width modulation)控制器当中,测试结果表明:在整个负载范围内,DC-DC在启动过程中电感电流平稳变化,输出电压平滑上升、无过冲,启动时间控制在1.2ms.     

数控开关电源的研究

文章研究一款实验室用小功率数控开关电源,选用半桥型电路作为其主电路,采用DSP作为数控开关电源的控制核心和一种新型数字PID算法,给出了主电路及控制电路的设计方法,利用MATLAB建立了PWM子系统和数字PID控制模型,对所取主电路及控制回路参数进行了仿真。仿真结果表明该系统具有良好的调节功能,既满足一定控制精度要求,又满足实时性要求。     

DSP控制移相全桥DC-DC变换器的研究与设计

随着电力电子技术的日渐成熟,开关电源越来越朝着小型化,高效化的方向发展。DC-DC变换器是以移相全桥为主电路,其核心的数字化控制是DSP来实现的。移相全桥DC-DC变换器具有开关损耗小,效率高和输出电流纹波小等优点。本文内容包括硬件电路设计、软件的实现及通信协议等。     

二象限DC-DC变换器光伏发电系统设计

对光伏发电问题进行了研究,提出了二象限DC-DC变换器的设计,变换器主电路采用半桥式双向直流变换的结构拓扑,实现了能量的双向流动和升降压功能;控制电路采用TMS320LF2407DSP为中心控制芯片,由专门的电压、电流采样调理电路以及驱动电路完成脉冲宽度调制（PWM,Pulse WidthModulation）信号的产生和输出,并对PWM信号的产生、输出进行电力电子仿真（PSIM,Power Simulation）,结果表明,该变换器能够实现蓄电池的充放电和升降压电路功能,提高光伏组件的利用率。     

数字控制LLC谐振全桥变换器的应用设计

针对模拟电源效率较低的现状,提出一种基于DSP的数字电源方案。在对LLC谐振全桥变换器工作原理简单分析的基础上,采用DSP TMS320F28335设计了一款输入为DC300-400V,输出为DC48V/12A的原理样机,利用Saber仿真软件对其进行仿真与调试,仿真结果与实验数据表明,本文设计的LLC全桥谐振变换器能够在全负载范围内实现初级零电压开通（ZCS）以及次级零电流关断（ZVS）,输出电压纹波小于±0.5%,效率达到95%以上,满足设计要求。结论表明,LLC谐振变换器符合电源高功率密度、高效率的发展要求。     

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     

Long-Lifetime Power Inverter for Photovoltaic AC Modules

This paper presents a power inverter tailored for low-power photovoltaic (PV) systems. The inverter features high reliability, thanks to a circuit topology that obviates aluminum electrolytic capacitors from the circuit. Moreover, all components, including logic and control, have been designed to exhibit high reliability at high temperatures. Three conversion stages form the power topology. First, a full bridge connected to a high-frequency transformer and a full-bridge rectifier amplifies the voltage of the PV panel to approximately 475 V. This stage is controlled by using a phase-shift pulsewidth-modulation controller that permits zero-voltage switching, thereby minimizing losses. Second, a buck converter is connected in series with the rectifier and is controlled by using current mode in order to shape the current injection into a rectified sine wave. Last, a full bridge is operated at line frequency to unfold the current injection. The amplification stage has a proportional compensator that maintains the voltage at the PV terminals constant. The current injection stage has a proportional-derivative compensator that controls the amplitude of the grid current so that the dc-link average voltage is maintained constant. Experimental results show that the peak efficiency of the system is 89%, and the total current harmonic distortion is below 5%. Finally, analyses show a designed lifetime of approximately ten years.     

基于LM5117P的降压型直流开关稳压电源设计

降压型直流开关稳压电源是一种单向DC-DC变换器,实现稳定直流降压功能.本系统采用同步降压控制器LM5117P作为电路控制核心,以同步Buck电路作为降压主电路,通过闭环回路反馈设计以及芯片本身的精准采样,将输入电压16V降为5V恒压输出.     

48kW大功率高频开关电源的研制

主要介绍48kw大功率高频开关电源的研制。阐述国内外开关电源的现状．分析全桥移相变换器的工作原理和软开关技术的实现。软开关能降低开关损耗,提高电路效率。给出电源系统的整体设计及主要器件的选择。试验结果表明,该装置完全满足设计要求,并成功应用于电镀生产线。     

一种移相全桥DC/DC变换器的设计

设计了一种DSP控制移相全桥ZVS软开关式DC/DC升压变换器。主变换电路使用了移相全桥设计,能较好地实现零电压通断,且转换效率明显提高。控制电路采用DSP处理器控制,能有效地进行实时校正,获得稳定输出,同时由于软件控制调整移相角α,可实现直流输出的宽范围调整,具有较高的工程应用价值。     

A Novel Soft-Commutating Isolated Boost Full-Bridge ZVS-PWM DC–DC Converter for Bidirectional High Power Applications

A soft-commutating method and control scheme for an isolated boost full bridge converter is proposed in this paper to implement dual operation of the well-known soft-switching full bridge dc/dc buck converter for bidirectional high power applications. It provides a unique commutation logic to minimize a mismatch between current in the current-fed inductor and current in the leakage inductance of the transformer when commutation takes place, significantly reducing the power rating for a voltage clamping snubber and enabling use of a simple passive clamped snubber. To minimize the mismatch, the method and control scheme utilizes the resonant tank and freewheeling path in the existing full bridge inverter at the voltage-fed side to preset the current in the leakage inductance of the transformer in a resonant manner. Zero-voltage-switching is also achieved for all the switches at the voltage-fed side inverter in boost mode operation. The proposed soft-commutating method is verified through boost mode operation of a 3-kW bidirectional isolated full bridge dc/dc converter developed for fuel cell electric vehicle applications. The tested result verified the isolated boost converter can operate at an input voltage of 8.5–15V and an output voltage of 250–420V with a peak efficiency of 93% and an average efficiency of 88% at 55-kHz switching frequency with 72$^circ$C automotive coolant.