老练电压对铝电解电容器容量和漏电流的影响

老练电压对铝电解电容器的容量和漏电流有一定影响,对于低压（≤１６Ｖ）产品要确保老练电压的准确性;对高压（≤１００Ｖ）小容量产品,若容量偏差过大,可适当加高老练电压使其降低。老练后漏电流大的产品,加高老练电压也有良好效果。     

解决中高压铝电解电容器炸裂与开路的方法

中高压铝电解电容器老练工序出现炸裂较严重是人所共知的,并且中高压电容器常常出现开路的情况。本文通过炸裂开路统计分析,找到了电容器炸裂与开路的原因,并从理论上进行了分析,提出了解决的方法。     

中高压铝电解电容器老练工艺改进

中高压铝电解电容器由于老练电压高、时间长及内部压力大,特别是老练失效品的爆炸易引起其周围产品的损坏而成为老练工艺的难题。本文介绍采用恒压恒流老练电源一次性加压的老练方法及带有保护电阻的老练电路;改进后的老练工艺克服了旧工艺的不足之处,已成功地在大批生产上推广应用,值得借鉴。     

铝电解电容器的脉冲电压老练

本文介绍了利用脉冲电压对铝电解电容器进行老练的方法和试验结果。结果表明:一定的脉冲电压老练方法和程序可使老练时间缩短为1h,漏电流常数小于0.001s~(-1)。     

450V高压工作电解液的研究

用癸二酸铵作主溶质,通过多种添加剂的共同作用,成功地开发出可用于450 V高压铝电解电容器工作电解液,将此电解液用于450 V、1 000 mF电解电容器中,经过105℃1 000 h寿命试验,并取得良好的试验结果。     

节能灯电容器老练工艺的研究

研究了老练工艺对节能灯电容器漏电流的影响，通过不同条件（温度、电压、时间）下进行老练的试验，表明温度是影响漏电流及其稳定性的最主要因素。指出了保证节能灯长寿命、高可靠工作的三个因素：电容器在高温（１０５℃）下漏电流小；常规测试漏电流稳定；损耗小，阻抗频率特性好。     

新型高温高压长寿命铝电解电容器的研究

采用混合支链多元羧酸铵盐作为主电解质,乙二醇为主溶剂,配合辅助溶剂,添加多种功能防护剂,制作了新型高温、高压、长寿命铝电解电容器工作电解液,研究了以此电解液所制铝电解电容器的性能。结果表明,所制电容器具有耐高温、长寿命、耐大纹波、低漏电流等特点,用于节能灯、电子整流器时,通过了150℃2 000 h高温负荷寿命试验。     

Study on a new type aluminum electrolytic capacitor with high temperature, high voltage and long life

采用混合支链多元羧酸铵盐作为主电解质,乙二醇为主溶剂,配合辅助溶剂,添加多种功能防护剂,制作了新型高温、高压、长寿命铝电解电容器工作电解液,研究了以此电解液所制铝电解电容器的性能.结果表明,所制电容器具有耐高温、长寿命、耐大纹波、低漏电流等特点,用于节能灯、电子整流器时,通过了150℃2 000 h高温负荷寿命试验.     

新型高压工作电解液的研制

本文根据高压工作电解液的性能要求,确定了癸二酸为主溶质的新型工作电解液系统。成功地研制出了400V高压工作电解液,并制成了400V/100μF的电容器,其高温负荷寿命超过1000h。     

铝电解电容器老练工艺的改进

本文介绍了从日本引进的铝电解电容器用CS205K型全自动老练分选机的基本原理,以及对原有老练工艺的改进。由以前的恒压老练改为脉冲稳压老练后,提高工效四倍,老练后漏电流一次合格率提高14%。并且老练设备耗电大大下降,由原来的1000W降为150W。     

基于国产芯片的千兆皮秒脉冲激光器模块研制

皮秒脉冲光源是量子密钥分配系统核心器件。为了实现皮秒脉冲光源的国产化,基于国产芯片研制了一种千兆皮秒脉冲激光器模块。该模块采用比例-积分-微分算法控制温度,使光波长漂移在0.01nm以内,使用外部光电二极管探测光功率,反馈调整激光管驱动电流,进行了实验验证。结果表明,利用国产单片机精确控制恒流源和窄脉冲电路驱动激光管发光,输出光脉冲频率达到1.25GHz,脉冲宽度约为50ps,光功率为-3dB对应的谱宽小于0.2nm,输出光波长和功率稳定。此研制的国产化皮秒脉冲激光器模块可满足量子密钥分配系统对光源稳定性的要求。     

基于固体开关器件的新型高压脉冲驱动源

从MOSFET的开关基理,以仿真与电路实验相结合的方法,研究出了MOSFET栅极的"过"驱动技术,以此来提高MOSFET的开关速度。并结合多个MOSFET的串并联的级联技术,采用多管串联方法来提高脉冲源的输出脉冲幅度,采用多管并联方法来提高脉冲源的其输出脉冲功率,从而得到较大的脉冲宽度。在此研制出了输出脉冲幅度大于4kV、前沿小于10ns、脉冲宽度大于100ns的高压快脉冲源。     

双H桥双峰双向脉冲电镀电源设计与仿真

为了使脉冲电镀电源输出频率可调,电压可调,正向脉冲开启时间宽度和负向脉冲开启时间宽度可调的双峰双脉冲。特此提出了一种绿色可靠、节能高效的新设计方案,第一个H桥采用ZVZCS PWM DC/DC变换器对输入的直流电压进行降压,变成高频交流脉冲电压,然后经过高频变压器的隔离和耦合,再通过桥式整流滤波得到稳定的直流电压,最后经过第二个H桥进行切换,得到任意频率,任意占空比的双峰双向脉冲。实验证明应用该方案能降低开关管的开关损耗,降低元器件的要求,能将电源的效率提高到90%以上,同时由于此电源具有脉冲换向功能,在电镀时,大大增加了贵金属的利用效率。     

Self-oscillations and dynamic behavior of aged InGaAsP laser diodes

The pulse response of vapor-phase grown InGaAsP/InP 1.3 μm laser diodes was studied before and after accelerated aging. Dynamic behavior, including self-sustained oscillations, was found to be largely unaffected by the aging process. This indicates that these lasers can be preselected for specified modulation characteristics that will remain constant over the operating life of the diode.     

用于功率MOSFET的新型栅电荷测试电路

栅电荷是用于衡量功率MOSFET开关性能的重要参数,通常采用在栅极输入电流阶跃信号的方法来测量。一种新型的栅电荷测试电路被提出,该测试电路使控制信号从MOSFET的源极输入,从而消除了控制信号对栅极输入电流的影响。因为输入电流太小不能直接测量,测试时采用测量电压阶跃信号的方法来衡量电流阶跃信号的性能。与以往的测试电路对比结果表明,该电路可以使MOSFET栅极输入的电流更接近于理想的电流阶跃信号,该信号上升时间小于100 ns,并且上升后稳定,因此提高了栅电荷测量的准确度。     

Frequency analysis of the peripheral pulse wave detected in thefinger with a photoplethysmograph

A photoelectric plethysmograph is described that performs a frequency analysis of the peripheral volume pulse wave using a portable computer. It was used to determine how the pulse shape varied with age using 54 subjects in three age groups, 10-29, 30-59, and 60-89 years. The youngest group had a larger power in the second harmonic, (normalized to the fundamental), with p less than 0.05 than the older two groups. The decrease of power in the harmonics of the peripheral pulse wave with age may be a useful noninvasive measure of aging and vascular disease.     

Efficient SSHI circuit for piezoelectric energy harvester uses one shot pulse boost converter

In this paper, a one shot pulse inductor boost converter is presented which provides 4 V output at 60 ms of delay using 0.15 V vibration source. Energy harvesting plays an important role in biomedical implants sensors where the extended life time is the most prominent factor. Synchronized switch harvesters on inductor (SSHI) comes into existence due to its highly efficient interface with energy harvesters. The main aim of this paper is to obtain high efficiency and maximum power extraction from piezoelectric energy harvester using SSHI and one shot pulse boost converter. This circuit does not require any external voltage and provides the controlled output with reduced power dissipation of approximately 10 nW and power consumption achieves between 1 and 10 mW. The start-up problem due to variable vibrational energy source is avoided by using one shot pulse inductor boost converter. This converter uses only one shot period for maximum charge transfer during first switching cycle. In 180 nm CMOS process, result shows that pulse boost converter can be directly powered from low voltage of 0.15 V with efficiency of?≈?90% across the load of 6 µA current having switching frequency of 206 kHz. It also eliminates the problem of switching losses and reduces leakage current by saving board space and external components cost.     

Power and life extension of battery-ultracapacitor hybrids

The performance of a battery-ultracapacitor hybrid power source under pulsed load conditions is analytically described using simplified models. We show that peak power can be greatly enhanced, internal losses can be considerably reduced, and that discharge life of the battery is extended. Greatest benefits are seen when the load pulse rate is higher than the system eigenfrequency and when the pulse duty is small. Actual benefits are substantial; adding a 23 F ultracapacitor bank (3 × 7 PC10 ultracapacitors) in parallel with a typical Li-ion battery of 7.2 V and 1.35 A hr capacity can boost the peak power capacity by 5 times and reduce the power loss by 74%, while minimally impacting system volume and weight, for pulsed loads of 5 A, 1 Hz repetition rate, and 10% duty     

面向车载激光雷达光源应用的窄脉冲驱动技术

随着目前车载激光雷达技术发展日渐成熟,为了提高探测精度及探测距离,对激光光源的窄脉冲、高峰值光功率指标要求也随之提高。提出了一种针对激光光源的窄脉冲驱动技术,包括理论分析、参数仿真、试验验证。具体从电路原理进行参数分析,并通过理论建模进行不同参数下的仿真,从仿真结果确定各元器件参数及选型,经过多轮试验验证并优化电路布线及布局,最终实现了窄脉冲驱动。经过装机验证,该窄脉冲驱动技术可以驱动激光光源实现窄脉冲(3ns)、高峰值光功率(80W)光电指标,整机装机应用后,可以提高整机的探测精度及探测距离。     

光纤中超连续脉冲的频谱展宽

为了产生高重复频率的多波长短光脉冲,利用锁模掺铒光纤激光器作为抽运光源,对色散位移光纤中的超连续脉冲进行了实验研究,成功实现了输出脉冲的频谱展宽.实验也发现,制约这个实验结果的主要因素是光纤激光器的输出脉冲的稳定性不够和功率不高.