一种应用于OLED显示驱动芯片的CMOS升压型PFM DC-DC转换器设计

由于DC-DC芯片工作模式的多样性,电源转换器的系统结构有多种不同选择。为了电源模块的安全可靠,往往需要多种保护电路模块。文中从系统的角度,阐述了适合于OLED显示驱动电路的PFM工作模式的升压DC-DC电源转换器的原理。在此基础上,设计了一种应用于OLED驱动电路芯片的升压DC-DC电路。当输入电压为2.4～4.2V时,输出电压可以达到15V,负载电流最大可以达到50mA,纹波电压小于200mV。这个设计可以与OLED驱动芯片集成在一起,实现OLED驱动芯片和电源管理芯片的集成。     

无机电致发光器件——冷光片测试电源的研制

无机电致发光是一项新兴的显示技术,由它所代表的冷光技术具有发光面积大,发光柔和均匀、重量轻、耗电量少、厚度薄且具有弯曲弹性等优点,因此应用非常广泛,但无机电致发光的微观世界难以直接观测.在此设计一款测试电源,通过测试冷光片的驱动电压、电流等参数指标,为分析发光机理提供一定的依据.方法是利用单片机控制和功率变换技术,设计出电压、频率、占空比均可调的测试电源.通过测量两种型号的发光片,证实该电源工作稳定,性能可靠,能够应用于无机电致发光材料的研究性测试和应用型测量.     

用实验室电源产生简单的高电流源

当电子测试需要可调电流源时,人们通常必须在实验室构建这种测试仪器。人们可以从标准的力觉实验室电源轻松制作这类电流源（图1）。该电路需要一个为IC供电的额外电源以及一个单独的控制电压。送往力觉电源的反馈信号来自Maxim公司的MAX4172高压侧电流监视器。在图1所示的构造中,     

陀螺电机数字可调式测试电源设计

详细研究了三相交流陀螺电机电源的工作原理,根据该测试源设计的主要技术指标的要求,利用多种集成电路模块,设计了一种陀螺电机数字可调式测试电源,实现了电源幅值、频率的精确数字可调,能够适应陀螺电机不同测试功能的需要.实验结果表明,该电源在陀螺电机的测试中具有较高的实用价值.     

大功率压电陶瓷驱动电源的研究与设计

设计了一种新型大功率压电陶瓷驱动电源。该电源由普通的低压运算放大器以及高压三极管搭建而成。采用负反馈以及相位补偿的原理,将输入的小电压的控制信号线性放大到大电压、高功率的驱动信号,用于驱动大容量的压电陶瓷。最后通过实验对驱动电源进行了测试,结果表明该电源输出精度高,响应快,稳定性好。该电源电路简单,成本低,因此具有很高的实用价值。     

宽输入电动汽车车载DC-DC电源研究

针对电动汽车车载DC-DC电源器件损耗高、稳定性差、效率低等问题,设计一种Boost变换器级联与半桥LLC变换器的车载DC-DC 电源。首先提出一种两级DC-DC变换器的主电路拓扑,结合输出功率与电压增益对其进行详细分析;其次采用基于数字信号处理器（DSP）的双环控制方式,引入母线电压可调,并给出参数设计过程,变换器最终能够满足宽输入范围要求,并使整个负载范围内的输出电压维持稳定;最后搭建实验样机,测试DC-DC电源在不同负载下的效率以及调压稳压性能。试验结果表明,该DC-DC电源能够满足宽范围输入电压,实现了宽范围的软开关,提高了整个负载范围内的传输效率。     

高性能便携式DC工作台电源

正任何电子实验室工具箱中都需要有工作台电源以及电烙铁和手持式万用表这些东西。有些项目仅需要一个恒定电压源,但是更常见的情况是,正确测试及调试一个项目时需要各种电压和电流。能够用一个高性能可调工作台电源随心所欲引入所需电压和电流可节省大量调试时间。可惜典型通用可调工作台     

基于TPS40055控制的新型同步BUCK电路设计

针对传统电源驱动电路启动慢,效率低,工作电流小,而目前光纤激光电源技术进入高集成化、高响应发展趋势的特点,提出了一种基于TPS40055控制的新型同步BUCK电路设计,可实现PWM及电流可调3路直流电源输出,各路电压分别为3.3V、5V、10 V,电流为0～11 A可调,能驱动不同型号大功率光纤激光器工作.从电路总体方案、工作原理、参数设计及优化等方面介绍此新型电源电路设计.结果证明,该设计能提供高效、可靠、稳定的激光器直流电源.     

基于CC2530的远程可调直流稳压电源设计

针对户外无线传感器网络中节点终端多样化供电需求的问题,文中以无线传感器网络芯片CC2530为控制核心,设计一种小功率可调直流稳压电源。该电源利用具备8051CPU内核的CC2530控制芯片,并结合ZigBee协议栈以及PWM电压反馈调节控制原理,实现输出稳压、远程调压、无线组网、监测、异常报警等功能。另外,电源节点端采用CC2530主控芯片端口输出PWM波,采用电压反馈调控占空比完成Buck电路输出工作的同时与协调器端通过无线传感器网络连接,使无线传感器网络芯片CC2530的片上资源得到充分应用。最后,通过搭建实验样机系统进行验证,室内测试采用直流电压源模拟户外光伏输入。测试结果表明,所设计的远程可调直流稳压电源输出电压误差小于0.5%,无线调压步进值为0.5 V,能够满足多种传感器终端设备的供电需求,具有较高的实用价值。     

一种96×64彩色OLED显示驱动电路的设计

OLED是一种新型平板显示器件,文章设计了一种应用于96×64彩色PM-OLED的显示驱动芯片。该芯片能实现256级对比度调节和65k色彩显示。芯片为高压、大电流的数模混合电路,内部包括数字控制电路,片内SRAM,片内振荡器,DC-DC升压电路,行驱动电路,高压基准电流源电路,以及电流精确可调的列驱动电路。该芯片是一种电流驱动型电路,列驱动电路采用PAM方式实现灰度调制,以及大电流预充的方式对PM-OLED屏幕像素进行预充。全芯片已通过Nanosim仿真,并进行了部分测试。仿真和测试结果验证了设计的正确性。     

一种高效率线性压电陶瓷驱动电源设计

为改善压电陶瓷驱动电源的静态功耗和动态性能,提出了可变静态工作点和工作电压的高压放大器。首先使用恒流源结构的放大器构成典型的高压放大器,然后通过比例微分电路动态调整放大器的工作电流,最后利用多组抽头电源给高压放大器分段供电,进一步降低系统功耗。实验结果表明,放大器在10 mA静态电流下,可以动态输出400 mA电流;放大器工作电压可以根据输出电压大小在50 V、100 V、150 V、210 V之间自动切换。放大器在很低的静态电流下可以获得很好的动态特性,满足设计要求。     

大功率LED的驱动电路设计

LED(Light Emitting Diode)作为新一代绿色光源,具有节能、环保和光转换效率高等特点,在照明应用方面已广泛展开.尤其是大功率LED光源更是备受喜爱,由于LED光源不能直接用市电220v电压直接供电,需特殊电压供电,因此,需要专门的驱动电路来点亮LED.本论文主要介绍一种LED恒流驱动电路,其采用恒流芯片PT4115来实现对大功率LED的高效恒流驱动.此电路具有效率高、成本低,可靠,安全等优点,适合当今大功率LED驱动电路的市场发展前景.     

实现64级灰度显示的无源OLED驱动芯片的设计

设计出了一种实现64级灰度显示的单片混合信号驱动芯片,它采用脉冲宽度调制方法和两级电压预充方式,适用于驱动132×64像素的无源OLED显示屏.芯片内部主要包括数字控制器,显示数据存取器,DC-DC电压转换器,参考电流产生器,电压预充电路产生器,64个行驱动电路和132个列驱动电路.它已经用Chartered0.35μm 18V高压CMOS工艺制作完成,芯片面积约为10mm×2mm.测试结果表明芯片性能良好,在电源低压为3V,高压为12V,显示电流为100mA并处于最高级灰度显示的条件下,芯片与面板的总功耗为294mW.     

新型大功率蓝光LED光源驱动电路设计

为了采集水下目标的图像信息,降低水下成像系统的成本,通过采用大功率蓝光LED代替传统的激光器做光源,结合CCD成像技术,调节光束的发散角来照射水下目标场景,将目标全部或目标的关键特征部位照亮,实现对水下目标的成像。设计了基于IRIS4011构成的大功率蓝光LED的恒压恒流驱动电路。本驱动电路稳定可靠地控制LED在额定功率下工作,通过水下成像实验,采集到了水下目标的信息,实验结果表明窄小的视场范围内跟踪和接收目标信息,很大程度上减小了后向散射光对成像质量的影响,并提高了系统的信噪比和作用距离。     

A new UPS topology employing a PFC boost rectifier cascadedhigh-frequency tri-port converter

A new uninterruptible power supply (UPS) topology using the high-frequency tri-port UPS technique is proposed which presents the advantages of no-break power, low cost, input unity power factor, high power density, and high power conversion efficiency. Through the proposed circuit configuration, charging concept, and control strategy, the battery management is easily obtained by controlling the output voltage of the power-factor-correction (PFC) converter, which results in no additional power device being required for charging. The implementing circuit of the charging method is submitted to perform the two-stage charging, constant current charging, and constant voltage charging. The proposed technologies can be applied to the switching power supply with built-in UPS function featuring a low-cost solution for computer equipment, Finally, an experimental AC online UPS is built to verify the proposed concept, analysis, and control strategy     

Application of source biasing technique for energy efficient DECODER circuit design: memory array application

Researchers have proposed many circuit techniques to reduce leakage power dissipation in memory cells.If we want to reduce the overall power in the memory system,we have to work on the input circuitry of memory architecture i.e.row and column decoder.In this research work,low leakage power with a high speed row and column decoder for memory array application is designed and four new techniques are proposed.In this work,the comparison of cluster DECODER,body bias DECODER,source bias DECODER,and source coupling DECODER are designed and analyzed for memory array application.Simulation is performed for the comparative analysis of different DECODER design parameters at 180 nm GPDK technology file using the CADENCE tool.Simulation results show that the proposed source bias DECODER circuit technique decreases the leakage current by 99.92％ and static energy by 99.92％ at a supply voltage of 1.2 V.The proposed circuit also improves dynamic power dissipation by 5.69％,dynamic PDP/EDP 65.03％ and delay 57.25％ at 1.2 V supply voltage.     

Improved current drivability with back-gate bias for elevated source and drain structured FD-SOI SiGe MOSFET

Fully depleted (FD) silicon-on-insulator (SOI) MOSFET structure with back-gate bias is suggested for high speed and low power consumption for portable communication application. Ni silicide is demonstrated for improving current drivability for low power consumption by reducing series resistance in the source and drain region. Threshold voltage adjustment is also achieved through applied back-gate bias. For the formation of the buried back-gate, the selection of impurity type as well as its doping concentration is controlled. Employing back-gate bias for FD-SOI NMOSFET, improved current drivability with variable threshold voltage is achieved. Short channel devices are fabricated and its electrical characteristics are obtained under various conditions.     

Novel Tracking Power Supply for Linear Power Amplifiers

Conventional linear power amplifiers (LPAs) show a high output voltage quality but are characterized by high power losses and/or low power density. Therefore, there is a growing interest in increasing the efficiency of LPAs, e.g., for the realization of high power testing voltage sources. In this paper, a high-frequency isolated boost-type tracking power supply (TPS) system is proposed for the conditioning of the input voltage of an LPA. The output voltage of the TPS is varied according to the voltage to be formed by the LPA so that the voltage drop across the power amplifier output transistors is reduced to low values. This results in a significant increase of the total system efficiency. The operating principle of the proposed system is described. A design method for the output filter using the power supply rejection ratio of the LPA is proposed. This method ensures that the amplifier output voltage has minimal switching frequency components. Furthermore, a control system design method is presented that ensures good performance in the control of the constant inductor current of the switch-mode tracking stage. Finally, the theoretical considerations are verified by measurements on a 1-kW laboratory prototype.     

A novel high voltage start up circuit for an integrated switched mode power supply

A novel high voltage start up circuit for providing an initial bias voltage to an integrated switched mode power supply(SMPS) is presented.An enhanced mode VDMOS transistor,the gate of which is biased by a floating pisland, is used to provide start up current and sustain high voltage.An NMOS transistor having a high source to ground breakdown voltage is included to extend the bias voltage range to the SMPS.Simulation results indicate that the high voltage start up circuit can start and restart as designe...     

一种新型的用于开关电源的高压启动电路

文章提出了一种给集成开关电源提供初始电压的高压启动电路。一个增强型的VDMOS晶体管被用来提供启动电流和承受高压。VDMOS的栅被一个浮空P岛偏置。启动电路用了一个具有高的源对地击穿电压的NMOS来获得大的偏置电压范围。仿真结果表明高压启动电路能够按照设计正常的启动和重启动。本文提出的结构比起其它方案来更节能,成本更低。