During the circuit design , the author analyzed the basic principle of the direct current motor , pwm control , h - bridge power driver , and two control techniques of h - bridge power drive circuit , designed its general structure , so the feasibility of the design is confirmed . then , reference , oscillator , power dmos gate drive circuit ( charge pump , bootstrap ) , and dead time generation circuit are designed and analyzed in the sub - circuits . a current - controlled oscillator is presented in this thesis 在电路设计中,作者介绍了直流电机的工作原理和数学模型、脉宽调制( pwm )控制原理、 h桥电路基本原理和h桥功率驱动电路的两种控制模式,设计了驱动电路的总体结构,给出了电路的功能模块,确定了设计的可行性,然后在子电路模块中,重点分析设计了基准源电路、振荡器电路、高端功率管栅驱动电路(电荷泵及自举电路) 、低端功率管栅驱动电路和死区时间产生电路。
Unlike the traditional single mode of charge pump structure , the paper adopted 1x / 1 . 5x fractional adaptive charge pump , which can automatically convert working mode with the change of input voltage , and utilized ultra - low - dropout current regulators to make 0 . 15v led _ minimum regulation voltage in order to remain the charge pump working mostly in higher - efficiency 1x mode 与传统的单一转换模式的电荷泵结构不同,本文采用了1倍/ 1 . 5倍分数型自适应电荷泵技术,可随输入电压的变化自行转换工作模式;采用低压差电流调节器使led阴极最小调节电压仅为0 . 15v ,使电荷泵更多地工作在效率更高的1倍模式。
The charge pump automatically switches between 1x / 1 . 5x modes based on the input voltage , to maintain correct output levels at a high power efficiency . the led driver regulates the current of leds to a value configured by the outside control signal . the four led output channels are current matched for consistent led brightness 电荷泵电路的功能是根据输入电压自动选择1 . 5x或者1x电荷泵工作模式并输出相应电压信号,有较高的功率转换效率;电流控制电路的功能是实现几个并联led通道的电流匹配并根据外加输入信号控制led电流的大小。
But its performance is as same as common pll at a 5v voltage . so the pll performance is better than other plls at a 5v voltage , especially in power consumption and frequency . finally , the improved pll circuit used in the frequency synthesizer is composed of the improved vco , phase / frequency detector and charge pump . hspice simulation results show that the pll performance is better than other plls implemented by other vco in the same cmos technology 综合以上的研究与设计,本文用所改进的压控振荡器、无死区鉴相器及电荷泵电路组成了用于频率合成的锁相环电路,并对此电路进行整体设计及仿真,结果表明其在锁定时间、频率范围、输出相位抖动及功耗方面具有较好的性能,且对提高锁相环频率合成器的整体性能有一定的作用。
To ensure the charging pump working reliably , the following measures should be adopted : ( 1 ) adopting modified circular casing to reduce the radial force of the impeller and decrease the seal clearance ; ( 2 ) using radical ribs on impeller and helical sealing on shaft to realize minor pressure differential ; ( 3 ) using back pressure stuffing box to ensure sealing under small packing force ; ( 4 ) adopting self - lubricant flexible graphite stuffing for absorption of solids entering in the graphite in case of leaking 为确保灌注泵可靠工作，提出改进措施： ( 1 )采用改型环形泵体降低叶轮的径向力，减小轴封间隙，抑制泄漏； ( 2 )采用背叶片降低叶片根部压头，获得微压，使轴封两端承受较小压差； ( 3 )采用螺旋密封降低轴封两端压差，在保持微压的同时避免出现负压，密封效果更好； ( 4 )采用反压式填料密封结构，在很小的压紧力下，即可保证密封； ( 5 )采用具有润滑功效的柔性石墨填料，即使发生轴封泄漏，进入石墨内部的固相颗粒也将随着石墨的消耗而被钻井液吸收。
In the charge pump principle section , the principle of linear mode and skip mode are analyzed in detail . the principle of step - up / step - down and the main parameters are also given in there . in sub - block circuit section , the typical circuits including reference , operational amplifier , thermal protection and current limit are introduced 在电荷泵基本理论中,详细分析了线性( linear )模式、跳周期( skipcycles )模式和具有迟滞控制的跳周期模式;同时也介绍了电荷泵的升压/降压工作原理以及主要性能参数及其意义。
The carrier wave is modulated directly by the baseband signal at several frequency point in l band and s band . firstly , this paper clarifies the theory of i / q modulation , elaborates evm and acpl , and analyzes the effect of amplitude and phase unbalance and dc offset on evm . secondly we review the basic principle of phase locked loop and it ’ s composing parts , including the basic conception and design method of pll frequency synthesizer , especially introduce the charge pump pll frequency synthesizer in detail 首先,在阐述i / q正交调制基本原理的基础上,通过对误差矢量和邻近信道功率泄漏的详细分析,定性、定量地讨论了各种非理想电路因素(如相位不平衡、幅度不平衡、直流偏差等)对调制器性能的影响;其次,介绍了锁相环的工作原理和基本组成部分,包括锁相环的设计和环路滤波器的设计,特别详述了电荷泵锁相频率源;第三,介绍了采用直接调制技术模拟卫星信号的射频前端的设计;最后,对整个直接射频调制系统进行测试,结果基本上达到了课题要求。
This work puts forward different kinds of testing methods for different models of the charge pump phase - locked loop and strongly describes how to combine the various tests into a unified strategy - all - digital dft ( design - for - test ) testing analysis for charge pump phase - locked loop 摘要以电荷泵锁相环为对象，提出了针对电荷泵锁相环各个模块的不同测试方法，著重论述了如何在一个完整的测试方案中把不同的测试方法结合起来即采用电荷泵锁相环的全数字可测试性设计( dft )法。
This converter is thermally protected and current limited , protecting the load and regulator during fault conditions . in the circuit design chapter , the basic charge pump operation principle and equivalent circuit model are given first . then two control modes , pulse skip mode and linear mode , are analyzed 在电路设计中,首先分析了跨周期调制的电荷泵dc / dc转换电路的基本原理,然后推导出电荷泵等效模型,以此为理论依据分析了电荷泵的两种控制模式:线性调制模式和跳周期调制模式。
