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分析了ZCS PWM DC/DC变换器电路的工作原理,探讨了主要参数的设定,并建立了基于Matlab的仿真模型,通过选择参数对仿真模型和程序进行校核和调试,证明了零电流关断电路可以有效地减小关断损耗,提高工作效率。 相似文献
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DC/DC变换器稳态建模的教学方法 总被引:2,自引:0,他引:2
本文介绍了一种为DC/DC变换器建立稳态模型,并利用稳态模型分析变换器的稳态工作特性的教学方法和研究思路。本方法所建模型既可以体现变换器的DC/DC变换功能,又可以包含变换器在稳态工作时的主要损耗。模型结构简单,运用简单的电路分析方法,就能够较为简便地得出直流变换器稳态工作时的主要电气特性。本文所介绍的建模方法是研究直流变换器稳态工作特性的有力工具,在教学研究中都具有较高的推广价值。 相似文献
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文章提出了一种采用电流矢量PWM控制的非线性控制策略,该方案通过电流矢量PWM控制来跟踪电流指令,从而简化了电流型PWM AC/DC变换器波形发生。在建立电流型PWM AC/DC变换器d-q模型基础上,采用输入输出线性化方法实现了解耦控制,给出了理论分析和调节器参数整定算法,并利用Mallab对控制策略进行了仿真,获得了预期效果。 相似文献
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PWM DC/DC变换器的应用 总被引:1,自引:0,他引:1
在数字电路的设计中,电源是一个关键部分。数字电路大多需要直流稳压电源,且由于芯片种类繁多,所需电压也多不一样,于是DC/DC直流变换器得到了大量应用。目前使用较多的DC/DC变换器是PWM(Pulse Width Modulation,脉冲宽度调制)开关变换器,通过控制电压振荡波形占空因数来得到 相似文献
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本文介绍了世界开关电源市场中DC/DC变换器向高功率密度化发展的主要趋势及世界市场对高功率密度DC/DC产品的需求现况。软开关DC/DC产品的问世标志着第一代PWM高功率密度DC/DC变换器将完成其历史使命;被称为第二代高功率密度DC/DC变换器的软开关DC/DC将成为未来的主流产品。本文还介绍了软开关DC/DC的代表性产品,美国Vicor开关电源公司的VI-300系列DC/DC变换器的主要特点。 相似文献
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为了提高复合电源双向DC/DC变换器工作过程中的动态特性,提出一种用于三通道交错并联双向Buck/Boost变换器的R-S-T控制策略.分析该变换器在Buck模态下工作过程,建立了交流小信号模型,得出控制变量到状态变量的传递函数,在此基础上设计了R-S-T控制器并对其进行参数整定.相较于传统的PI控制,R-S-T控制策略具有更好的动态和稳态响应特性,最后通过仿真和实验验证了此方案的正确性和可行性. 相似文献
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摘要:由于双向DC/DC变换器在储能逆变系统中承担能量双向流动任务,因此,系统能量管理关键是对变换器控制策略进行有效选择。针对双闭环控制策略在双向DC/DC变换器动态性能、谐波抑制和抗干扰能力等方面的不足,提出了一种鲁棒反演滑模控制策略,建立了锂离子电池PNGV等效电路模型,搭建双重化双向DC/DC变换器主电路,最终利用实验平台对锂离子电池组在两种控制策略下的充放电情况进行对比分析,同时对鲁棒反演滑模控制策略下输入电压大幅扰动进行了研究。实验和仿真验证了所提出方法的有效性,在锂离子电池组充放电控制上鲁棒反演滑模控制策略相对于双闭环控制策略更具有优势,且该控制策略对于提高蓄电池的充放电效率具有普遍性。 相似文献
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针对现代工业对DC/DC变换器响应性能所提出的要求,在现有控制和建模方法的基础之上,对改善DC/DC变换器的动态响应性能的几种控制策略进行了归纳和总结。简要讨论了其控制原理,并比较了各种现代控制策略的优缺点。最后对DC/DC变换器控制方法的发展作了一定的展望。 相似文献
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移相控制ZVSPWM DC/DC全桥变换器是变换器的一个研究热点,诸如高性能、高效率、低噪声、低污染等理论问题急待研究。副边占空比丢失是移相全桥PWM DC/DC变换器中的一个重要现象,文章以移相全桥ZVSPWM DC/IX;变换器电路模型为基础,结合变换器谐振电路的工作特点,对变换器副边占空比丢失的原因进行了详尽的分析,阐述了全桥变换器滞后臂比超前臂更难实现ZVS的原因,最终得到了移相全桥ZVSPWM DC/DC变换器死区时间和工作频率的设置条件与解决副边占空比丢失的措施。 相似文献
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A new iterative technique for the steady-state analysis of pulsewidth modulated (PWM) DC/DC switching regulators is presented. The methodology is based on transforming the closed-loop regulator into an open-loop configuration. The steady-state solution is solved by two iteration loops. The first loop is to find the steady-state state variables when the power converter is at a fixed duty cycle. The circuit waveforms are obtained by a stepwise time-domain simulation method, which is based on using stepwise quadratic formulation of the circuit state variables with progressive analysis of the switches' states. The second iteration loop is to determine the steady-state duty cycle of the PWM modulator output, using an explicit “fictitious” ramp offset value as the error index. This two-loop iteration approach lessens the occurrence of the nonconvergence problem that is sometimes found in the single-loop iteration method. Furthermore, the advantages of this method include the following: (1) substantial improvement in speeding up the convergence to steady-state solution; (2) simplicity in requiring simple algebraic manipulations; (3) generality in determining valid topology without prior knowledge of the regulator operation; and (4) directness in determining the switching instants. Several examples illustrating the computational efficiency and the accuracy are presented and are verified with the available literature 相似文献
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Y. Ren L. Fan L. Chen S.-J. Wen R. Wong N. W. van Vonno A. F. Witulski B. L. Bhuva 《Journal of Electronic Testing》2012,28(6):877-883
Alpha particles, neutrons and laser-beam test results on an integrated pulse width modulation (PWM) controller operating in a DC/DC converter are presented in this paper. The PWM is fabricated on a 600-nm Bi-CMOS technology. Single-Event Transient (SET) derived from a bandgap circuit was amplified by a filter capacitor in the propagation path. Finally, a constant 6-??s SET pulse was observed on PGOOD pin which is a supervisory signal. This glitch caused system resets. Pulsed laser technology was adopted to locate the origin of the SET. 3D TCAD and circuit simulation tools were used to analyze the root cause. System and circuit level hardening approaches to mitigate the SET are also presented. 相似文献
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Modeling PWM DC/DC converters out of basic converter units 总被引:4,自引:0,他引:4
Tasi-Fu Wu Yu-Kai Chen 《Power Electronics, IEEE Transactions on》1998,13(5):870-881
An alternative approach to modeling pulsewidth-modulated (PWM) DC/DC converters out of basic converter units (BCUs) is presented in this paper. Typical PWM DC/DC converters include the well-known buck, boost, buck-boost, Cuk, Zeta, and Sepic. With proper reconfiguration, these converters can be represented in terms of either buck or boost converter and linear devices, thus, the buck and boost converters are named BCUs. The PWM converters are, consequently, categorized into buck and boost families. With this categorization, the small-signal models of these converters are readily derived in terms of h parameter (for buck family) and g parameter (for boost family). Using the proposed approach, not only can one find a general configuration for converters in a family, but one can yield the same small-signal models as those derived from the direct state-space averaging method. Additionally, modeling of quasi-resonant converters and multiresonant converters can be simplified when adopting the proposed approach 相似文献
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A steady-state analysis and experimental results for a dual sepic pulse-width-modulated (PWM) DC/DC power converter for both continuous and discontinuous modes of operation are presented. The converter is dual to a sepic converter, but it can also be derived from a forward converter by replacing one of its rectifier diodes with a coupling capacitor. The circuit acts as a step-down or step-up converter, depending on the value of the ON switch duty cycle. The transformerless version of the converter has a positive DC/DC voltage transfer function. Therefore, the circuit is suitable for distributed power systems. Design equations for all circuit components are derived. Experimental results measured at 100 kHz were in good agreement with theoretical predictions 相似文献
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A parallel resonant DC link (PRDCL) circuit topology is proposed as an approach to realizing zero switching loss DC-AC high switching frequency power conversion. The proposed circuit is used as an interface between the DC voltage supply and a voltage source pulse width modulated (PWM) inverter to provide a short zero voltage period in the DC link of the inverter to allow zero voltage switchings to take place in the PWM inverter. The peak voltage stress on the PWM inverter switches is limited to the DC supply voltage. Another significant advantage of the circuit is that the inverter can be controlled by the conventional PWM strategy. The proposed circuit is systematically analyzed and its operation principle is explained. Design considerations and design formulas are presented. A complete zero voltage switching DC-AC system consisting of the proposed circuit and a PWM inverter was simulated on a computer 相似文献
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Kwok-Wai Ma Yim-Shu Lee 《Power Electronics, IEEE Transactions on》1994,9(3):346-354
The design, analysis and trade-offs of a novel method to sense the inductor and DC output currents of PWM converters are presented. By sensing and adding appropriately the currents in the transistor, rectifier and capacitors of a converter using current transformers, the waveforms of inductor and DC output currents can be reconstructed accurately while maintaining isolation. This method offers high bandwidth, clean waveform, practically zero power dissipation and simple circuit. The technique is applicable to all PWM converters in both continuous and discontinuous modes, and is most suitable for the implementation of current mode control schemes like hysteretic, PWM conductance control, and output current feedforward. This approach has been experimentally verified at a wide range of current levels, duty cycles, and switching frequencies up to 1.4 MHz 相似文献