用降压型单电感多输出DC-DC变换器输出高电压

本文发现并证明了降压型单电感多输出DC-DC变换器当电感工作于连续导通模式下能够产生高于电源电压的输出。这个发现将降低需要同时输出高压和低压的DC-DC变换器的结构复杂性。本文实现了一个降压型结构的单电感双输出的直流变换器,供电电压3.3V,输出为1V和4V。实验结果很好的证明了本文的结论。     

一种低功耗PFM升压型DC-DC开关变换器设计

基于EPISIL 1．5μm 25V双极工艺，完成了一种低功耗电流控制型PFM DC-DC升压开关变换器芯片的设计，采用Hpsice电路模拟软件对设计进行了验证，达到了相应的设计指标。     

单电感双输出降压型DC-DC变换器的设计

设计了一种利用单个电感实现双路输出的低电压降压型(Btlck)DG-DC变换器,提供200mA(1.8V)和400mA(1.2V)的带负载能力.引入平均电流控制模式,并采用了一种无损电流检测的方法.轻负载时电路工作在非连续电流模式(DCM)下.实现了片上补偿和片上软启动.采用TSMC 0.25grn CMOS混合信号工艺,版图面积2.2mm×2.2mm.     

一种高性能DC-DC升压变换器的设计

设计了一种内部集成控制电路和DMOS功率开关管的单片集成电流型PWM升压变换器。该芯片的开关频率为1.6 MHz,采用1.5μm BCD工艺实现,具有很宽的输入电压范围(2.7~14 V)、高转换效率(负载电流1~500 mA)。给出了芯片设计方法、思路及主要单元电路模块,如振荡器、输入比较、PWM比较及过温保护电路,的设计方案,总结了该芯片设计中应注意的次谐波振荡和开关噪声问题。仿真及实验测试结果充分验证了芯片的各项性能。     

一种用于升压型DC-DC变换器的过温保护电路

设计了一种用于升压型DC-DC变换器的过温保护电路。采用具有正负温度系数的电流相减,得到随温度变化更加明显的电流,经过电阻分压控制三极管的通断,并采用推挽反相器整形滤波后得到输出信号,实现了芯片过温关断和迟滞开启的功能。采用HHNEC BCD 0.35μm工艺,使用Cadence软件进行仿真验证。仿真结果显示,在各个工艺角及电源电压波动情况下,电路均能在芯片温度上升到170℃时关断、在芯片温度下降到140℃时开启,迟滞值为30℃(±2℃)。     

一种恒压输出的DC-DC升压电路设计

针对DC-DC升压器存在效率低,纹波电压较大,输出电压不稳定等问题,文中开发和设计了一种具有恒定输出电压的DC-DC升压转换器的方法。通过升压电路和电压反馈技术,将波动的输入电压变成恒定的直流电压输出。该设计通过将转换器的输出电压与参考电压相比较,两者的差值会产生一个PWM信号控制升压器的通断时间,从而达到恒定电压输出。仿真结果显示,该实验电路能在频率为20 kHz的连续导通模式中工作,产生24 V的恒定输出电压,输出功率为100 W。     

单电感多路输出DC-DC转换器的建模与设计

建立了单电感多路输出(SIMO) DC-DC转换器的数学模型,通过Matlab验证了SIMO模型的可行性.为解决SIMO控制电路复杂以及静态工作电流大的问题,提出在电流域设计SIMO控制器的方法.该方法将SIMO多路输出电压反馈信号转换为电流信号,与基准电流信号和电感电流信号一并输入多环路PWM控制器,PWM控制器在电流域完成需要的运算及环路频率补偿.仿真结果表明,该算法可行,电路设计方法简洁,在0.13 μm CMOS工艺下,三通道SIMO的面积为0.76 mm2,静态电流为110 μA,驱动能力为200 mA.     

一种多模式四开关降压-升压型DC-DC转换器

为了提高电池能量利用率,延长便携式电子设备的电池使用时间,提出一种级联4开关降压-升压型DC-DC转换器.该电路采用多模式工作方式,能根据输入和输出电压的具体关系和不同的负载条件采取相应的控制策略,以提高转换器的效率;在电池电压的整个波动范围内,提供稳定的电压输出.整个系统使用1.5μm BCD(Bipolar-CMOS-DMOS)工艺设计实现.     

一种基于升压DC-DC变换器的白光LED驱动芯片

设计了一种升压型恒流LED驱动芯片,驱动电流可由外接电阻从15～300 mA任意调整,输入电压为2.8～5.5 V,输出电压最高可达38 V.设计固定开关频率为1 MHz,应用时只需很小的外接电感即可.相对于其他驱动器电路,该驱动器增加了过压保护电路,无需外接稳压二极管,降低了应用成本.采用上华0.5μm BCD工艺完成芯片的设计,传输效率高达94％.     

一种平均电流模式控制的单电感双输出型开关电源转换器

An integrated single-inductor dual-output （SIDO） switching DC-DC converter is presented. The outputs are specified with 1.2 V/400 mA and 1.8 V/200 mA. A decoupling small signal model is proposed to analyze the multi-loop system and to design the on-chip compensators. An average current control mode is introduced with lossless, continuous current detection. The converter has been fabricated in a 0.25μm 2P4M CMOS process. The power efficiency is 86% at a total output power of 840 mW while the output ripples are about 40 mV at an oscillator frequency of 600 kHz.     

A single-inductor dual-output switching converter with average current mode control

are about 40 mV at an oscillator frequency of 600 kHz.     

用于神经刺激器的单电感双极性直流电压转换器

提出了一种应用于神经电刺激器的单电感双极性输出(SIBO)的直流电压转换器,具有良好的轻载效率和较低的设计复杂度.提出的SIBO系统只使用一个电感,通过两相控制同时输出正负电压,降低了控制复杂度,减少了开关通断次数,提高了效率.同时使用数模混合电路、固定导通时间调制方式实现逻辑控制,提高了系统效率,降低了设计复杂度.S...     

适用于具有自适应续流电流的单电感双输出降压变换器的准滑模控制器设计

An analog implementation of a novel fixed-frequency quasi-sliding-mode controller for single-inductor dual-output(SIDO) buck converter in pseudo-continuous conduction mode(PCCM) with a self-adaptive freewheeling current level(SFCL) is presented.Both small and large signal variations around the operation point are considered to achieve better transient response so as to reduce the cross-regulation of this SIDO buck converter.Moreover,an internal integral loop is added to suppress the steady-state regulation error introduced by conventional PWM-based sliding mode controllers.Instead of keeping it as a constant value,the free-wheeling current level varies according to the load condition to maintain high power efficiency and less cross-regulation at the same time.To verify the feasibility of the proposed controller,an SIDO buck converter with two regulated output voltages,1.8 V and 3.3 V,is designed and fabricated in HEJIAN 0.35 m CMOS process.Simulation and experiment results show that the transient time of this SIDO buck converter drops to 10 s while the cross-regulation is reduced to 0.057 mV/mA,when its first load changes from 50 to 100 mA.     

一种新的用于电流模式DC-DC Boost变换器SPICE模型

提出了一种高精度的电流控制模式DC-DC Boost(升压)变换器SPICE模型.适用于CCM(连续电感电流模式).考虑了功率开关管的导通电阻、二极管的正向压降和电阻等重要参数,可以在HSPICE或Spectre仿真器上进行小信号分析,解决了在仿真器上开关电感的存在而无法进行交流和稳定性分析的问题.通过仿真波特图可以对系统的稳定性做出定量和定性判断,为开关电源的设计提供了一种快速准确的方法.     

Fuzzy PI-type controller design for boost converter

We consider the fuzzy controller design problem for a boost DC-DC converter. We design a fuzzy PI-type controller based on the common control engineering knowledge that the transient control performance can be improved if we increase the P and I gains as the error grows. Using Kharitonov’s theorem, we derive a closed-loop control system stability condition which can be used to tune the fuzzy PI control parameters. Finally, we give simulation and experimental results to show the effectiveness and practicality of the proposed method.     

Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver

This article presents a control strategy based on simple digital pulse-width modulation (DPWM) and pulse-skip modulation (PSM) for a DC-DC boost converter, to drive a luminance-regulated white light emitting diodes (WLEDs). The presented control strategy not only retains most of the advantages and flexibilities of traditional digital PWM, but also reduces complexity and cost. Based on analyzing the principle of the presented control strategy, the white light emitting diode (WLED) driver is designed and simulated using the 0.6 (m CMOS process. Simulation results of the boost converter show that the power efficiency is above 76% for a full load, with a peak efficiency of 88% when supply voltage varies from 2.7 V to 5.5 V. The control strategy overcomes low efficiency for PWM mode with light load.