大功率半导体激光器恒流源设计

为了满足K98SA3F-30.00W-R型号(工作电流12A,纹波系数要求小于0.05%)半导体激光器对高功率、高稳定度的需求,设计了恒流源驱动电路,主要采用电流模式同步降压开关控制芯片LTC1625、电流检测放大芯片LT1620、功率场效应管IRF7811、数字电位器AD5231和π型滤波器使电路实现高效率、高精度、高稳定度的电流输出.通过LTspiceⅣ软件进行了模拟仿真,当电路工作在恒流模式时,输出电流在0～20A之间连续可调,最小可调步进电流值0.061A,电流纹波系数可达0.001%以下.结果表明,该恒流源完全满足K98SA3F-30.00W-R型号半导体激光器的应用要求.     

半导体激光管驱动电源设计与实现

为提高半导体激光器光功率输出稳定性,并保证激光器安全、可靠工作,设计了半导体激光器的驱动电源。驱动电源主电路采用同步DC／DC方式,输出效率高;驱动电路可以产生200kHz触发脉冲,降低了输出电流的纹波,保证激光器输出功率稳．定;驱动电路带有过压比较器及过流比较器,保证激光器安全工作。经过仿真和实验表明：该驱动电源在20A工作时效率达到85％以上．纹波小于5％。     

光纤放大器抽运模块LD驱动电流源设计

为了实现光纤放大器的抽运模块驱动电源精度高、纹波系数小、转换效率高并具有一定保护功能,设计了半导体激光器的驱动电流源。该电流源由驱动、串口控制等模块组成。采用基于LM2676的开关转换方式,构建了转换效率较高的恒流源系统,并应用于LD驱动。经测试,通过LD的电流最大为2.5A,输出电流精度达到0.1%,转换效率可达85%以上,LC滤波电路使输出电流纹波减少至0.5mA;具有串口通信电流源控制系统,能够实现对驱动电流值的远程读取与设置。结果表明,该电流源达到理论设计要求,可应用于光纤放大器抽运模块。     

交错式单管正激变换的半导体激光器电源研究

为了简化半导体激光器电源的电路结构、提升其电能转换效率、实现输出电流的快速动态响应,采用单管正激变换的并联交错技术,设计出一种2kW单级变换的开关型直流驱动电源。测试并分析了电源的静态特性、动态特性及电能转换效率。结果表明,电源的效率高达85%;输出电流0A～100A的上升、下降时间仅为1ms;满载100A工作时,输出电流的纹波系数仅为0.04%。与两级串联结构的半导体激光器电源相比,电源的效率得以提升,输出电流的动态响应速度迅速,满足激光加工的要求。     

Interleaved soft switching resonant converter with a small input ripple current

ABSTRACT

An interleaved frequency control soft switching converter is studied for solar power or fuel cell power applications. The proposed circuit topology contains two parallel current-fed circuit cells with interleaved pulse-width modulation operation. Thus, the ripple currents at input and output terminals are decreased. In each circuit cell, the proposed current-fed dc-dc converter includes boost circuit and resonant circuit to achieve current ripple-free on low voltage side and less switching losses on active devices. The boost circuit and the resonant circuit have same active devices to decrease power switches. Due to the resonant behaviour, the reverse recovery current loss on secondary diodes is removed. The voltage doubler circuit topology is accomplished on secondary-side to reduce diode counts and conduction loss. The performance and effectiveness of the developed interleaved PWM current-fed converter are verified and confirmed by experiments.     

两相两重斩波变换的半导体激光器电源研究

为了提高传统线性半导体激光器电源的电能转换效率、输出电流的动态响应以及对负载电压的自适应能力,采用两相两重斩波变换技术,设计了一种半导体激光器用2kW直流驱动电源。测试并分析了该电源在激光系统中的静态特性、动态特性以及两相两重斩波变换电流源的效率。结果表明,电源对负载电压自适应能力强,具有较好的矩形输出特性;直接驱动激光二极管模块时,该电流源的电能转换效率高达93%,输出电流0A~100A的上升、下降时间仅为0.5ms,电流纹波系数小于0.03%。     

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。     

一种高性能的新型脉冲激光电源

介绍了一种高性能、用于中小功率脉冲激光器的新型开关电源,它采用Cuk变换器作为主电路的拓扑.文章分析了主电路和控制电路的工作原理,给出了测试结果.与传统电路相比,电源具有结构简单,性能优异,使用元器件少,价格低廉等优点.     

高重频可调小型高功率半导体激光电源研究

为了获得高功率、高重频半导体激光脉冲,设计了一种体积小、重量轻、造价低的纳米级大功率半导体激光器驱动电源。采用改进的单稳态触发器产生窄脉冲,经放大后驱动快速开关MOSFET获得大电流窄脉冲;电源脉冲电流驱动能力0A～80A,脉冲上升时间2.8ns,下降时间3.8ns,脉冲宽度5ns～500ns范围内可调,最小5.2ns,重复频率可达200kHz。用该电源实验测试了激光波长为905nm的半导体激光器,在重复频率为10kHz时,激光脉冲峰值功率达到70W以上。结果表明,采用窄脉冲驱动MOSFET可以得到高重复频率10ns以内的大电流窄脉冲,可以驱动大功率半导体激光器,若驱动100A以上的激光器需进一步研究。     

双环功率控制的突发模式激光驱动器

设计了一款应用于无源光网络（PON）的突发模式激光驱动器及其双环功率控制电路。提出一种电荷补偿和动态偏置电路,减小了激光驱动器电流上升和下降时间,提高了输出电流能力;提出一种双环功率控制的反馈电路,解决了平均功率和消光比随温度变化的问题。基于0.18m RF CMOS工艺完成流片,激光驱动器芯片面积为1 600m800m。测试结果表明,激光驱动器的输出偏置电流和调制电流分别可达90 mA。激光驱动器突发响应开启时间小于2 ns,关断时间小于1 ns,发送数据速率高达2.5 Gbit/s,抖动大小为41 ps。激光驱动器输出平均光功率稳定性为0.26 dB,消光比稳定性为1 dB。该激光驱动器满足了PON系统对激光器的输出功率和稳定性要求。     

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.     

一种高精度大功率电镀电源设计

针对传统电镀电源体积大、实现方式复杂以及输出纹波大的特点,提出了一种新型的DC/DC变换器,采用双闭环PWM实时控制方式,具有恒电流和恒电压两种工作方式。用该方法设计了一组9.6 kW电源模块,实验表明,电源输出纹波系数小于1%,效率达到90%。     

A laser control chip combining a power regulator and a 622-Mbit/smodulator

This paper presents a circuit combining a 622-Mbit/s laser diode modulator and a power regulator with a closed loop bandwidth of less than 100 Hz. The power regulator's closed loop bandwidth is implemented using an integrator configuration employing a current division technique to implement a large integration resistor, and an electronic time-constant enhancement technique to achieve the desired closed loop bandwidth. Impacts of the electronic time-constant enhancement technique on noise performance are discussed. The power regulator includes an output stage capable of delivering the needed bias current for the laser diode. The output stage is implemented as a high-ratio bipolar current mirror using an area-efficient topology. The modulator has ECL-compatible inputs including 50-Ω input termination resistors, and it can modulate the laser diode with a current of up to 45 mA_pp      

905nm InGaAs脉冲激光二极管驱动电流特性分析与测试

为了实现高功率905nm InGaAs脉冲激光二极管激光脉冲宽度和峰值功率可调,采用现场可编辑门阵列产生触发脉冲、集成模块EL7104C作为金属氧化物半导体场效应晶体管（MOSFET）驱动、以MOSFET为核心开关器件控制高压模块和储能电容之间充放电的方法,设计了脉冲激光二极管驱动电路,对驱动电流特性进行了理论分析和实验验证,取得了不同电容和高压条件下的电流脉宽和峰值数据,分析了具体变化关系,并以此进行了光谱和功率-电流特性测试。结果表明,影响驱动电流脉宽和峰值电流的关键因素是电容大小和充电高压,脉冲激光二极管驱动电流峰值在0A~40A、脉宽20ns~100ns时可控调节,脉冲激光二极管最大峰值功率输出可达40W,实现了脉冲式半导体激光器输出功率和脉冲宽度的可控调节。该设计与分析对近红外高功率脉冲激光器的可控驱动设计具有一定的实用参考意义。     

高速纳秒脉冲激光器驱动电源的设计

介绍了一种可靠的脉冲激光器驱动电源的设计方法。采用直接调制技术,通过高速场效应管作为开关器件,辅以稳定的外围电路,调制出脉冲宽度小于2ns纳秒的窄脉冲光。     

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     

小型风力发电系统正弦波逆变器设计

为了提高小型风力发电系统输出电能质量,设计了高效、可靠、低成本的正弦波逆变器。主电路由推挽升压变换器和单相逆变桥组成,采用高频变压器实现电压比调整和电气隔离,降低了噪声,提高了效率、减小了输出电压纹波。逆变器功率开关管采用了RCVD缓冲电路,确保逆变桥安全工作。控制部分采用集成脉宽调制芯片SG3524和正弦函数发生芯片ICL8038实现正弦波脉宽调制(SPWM),简单可靠、易于调试。实验样机体积减小到传统逆变器的1/4,效率达到86%。实验结果表明输出电压波形失真度小于5%,在复杂的工况下实现了220 V/50 Hz的市电输出。     

轻便恒流充电脉冲固体激光器电源

介绍了一种轻便恒流充电脉冲因体激光器电源,采用把恒流充电电路与开关电路结合起来设计的方法,通过丢笨重的工频变压器和利用较高的开关频率降低电感－电容变换器中的电感量,从而使电源的体积和重量减小,效率提高。     

开关电源全波整流输出结果的对比研究

采用脉宽调制方波作为输入信号,对全桥和半桥驱动型开关电源的输出电压、效率和纹波系数都做了对比分析和研究。并研究了不同频率、占空比以及不同范围的负载电阻对两种工作电路的影响,分析了两种电路各自的优缺点。实验结果表明,半桥驱动型开关电源,在一定程度上限制了驱动电路的最大输出功率,因此在要求大功率输出时还要采用全桥驱动电路。而且全桥工作的效果也要比半桥好,稳定性更强,可为电路的设计提供一个参考。     

大电流长脉宽LD激光器驱动电源的研制

本文主要介绍了一种大电流长脉宽半导体激光器骄动电源的设计方法。根据大功率脉冲型LD的工作特性,作者设计了一套采用L—C串联谐振的恒流充电电路与大功率金属氧化层半导体场效应管（MOSFET）线性控制脉冲放电电路相结合的驱动电源。此电源满足了输出脉冲电流幅值、脉宽、重频、调Q精确延时均方便可调的要求;并且辅助以片上系统（soc）单片机和CPLD为核心的控制电路,使电源电路具有结构简单,控制灵活,精度高等特点;同时结合多路在线实时保护电路,有效保证了LD的安全工作。该电源已经成功应用于“XX装置”预放大器项目。