排序方式: 共有128条查询结果,搜索用时 15 毫秒
101.
PIC单片机在激光电源中的应用 总被引:1,自引:0,他引:1
设计了一种由电池供电的手持激光测距仪的APD偏置高压电源.该电源采用PIC16C782单片机作为主控芯片,从低压源产生高压电,通过脉宽调制改变输出电压提供给探测器和激光器,实现闭环控制.阐述了该电源Boest型直流升压的基本工作原理、硬件组成和软件设计.通过实验验证,该设计结构简单,功耗低,体积小,输出电压恒定可靠. 相似文献
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Wan-Rone Liou Ping-Hsing Chen Marynelle L. Z. Rosales Yeh Chun-Ting Kuo Mei-Ling Yeh 《中国电子科技》2008,6(3):279-283
This paper presents a novel dual-mode step-up (boost) DC/DC converter. Pulse-frequency modulation (PFM) is used to improve the efficiency at light load. This converter can operate between pulse-width modulation (PWM) and pulse-frequency modulation. The converter will operate in PFM mode at light load and in PWM mode at heavy load. The maximum conversion efficiency of this converter is 96%. The conversion efficiency is greatly improved when load current is below 100 mA. Additionally, a soft-start circuit and a variable-sawtooth frequency circuit are proposed in this paper. The former is used to avoid the large switching current at the start up of the converter and the latter is utilized to reduce the EMI of the converter. 相似文献
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基于MATLAB的Boost电路仿真方法 总被引:5,自引:1,他引:5
对Boost电路的开关过程进行了分析,并且应用Matlab的三种方法分别进行了仿真。最后通过波形进行比较,其结果是一致的,且与理论相符。 相似文献
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该文提出了一种前馈电流控制的斜坡补偿方法,将该方法引入到临界导通Boost 功率因数校正(PFC)转换器的设计中,以减小零交越失真问题,改善谐波电流和频率对系统的限制。基于临界导通Boost PFC转换器的拓扑结构,理论分析了前馈电流控制斜坡补偿技术对脉冲宽度调制(PWM)信号占空比的调制作用,推导出补偿斜率与输入线电压的关系式,迫使线电压零交越点附近的电流跟随电压变化。仿真和测试结果表明,该方法可有效抑制零交越失真现象,提高系统的动态性能,尤其在高频及轻负载情况下。测得Boost PFC转换器的总谐波失真(THD)仅为3.8%,功率因数0.988,负载调整率3%,线性调整率小于1%,效率达到97.3%。有效芯片面积为1.611.52 mm2。 相似文献
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The stability and bifurcation in a voltage controlled negative-output KY Boost converter is studied in this Letter. A glimpse at the stability and bifurcation from the power electronics simulator (PSIM) software are given. And then, its mathematical model and corresponding discrete model are derived. The stability and bifurcation of the converter are determined with the help of the loci of eigenvalues of the Jacobian matrix. It is found that the Hopf bifurcation is easy to come in this converter when the value of its energy-transferring capacitor increases. Finally, the analytical results are confirmed by the circuit experiment. 相似文献