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DC/DC变换器是电力电子领域重要组成部分,在能源紧张的今天,提高DC/DC变换器的效率及功率密度,具有重要的意义.功率器件的发展和软开关技术的提出使变换器高效高功率密度成为可能.本文介绍了DC/DC变换器的产生背景及发展方向. 相似文献
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本文讨论应用SPICE通用集成电路计算机分析程序仿真DC-DC变换器的方法。着重论述脉冲变压器的回旋器组等效模型、脉宽调制器的等效模型以及双稳态触发器和常用逻辑电路的数学模型。恰当运用上述模型,可仿真所有类型的DC-DC变换器,包括谐振变换器、PWM变换器、软开关变换器以及开关电容变换器。文中给出了一些实例。 相似文献
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随着电力电子技术的不断成熟,为了开关电源朝着重量轻、体积小、高频化、高效率的方向发展,文章采用软开关技术来使开关管实现零电压开通或零电流关断,从而提高了效率,减小了电磁干扰。同时发现,带饱和电感的移相全桥DC/DC变换器不仅可以更好的实现零电压开关,而且可以减小占空比的丢失。 相似文献
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We consider a switched-capacitor DC/DC power converter with variable switching instants. The determination of optimal switching instants giving low output ripple and strong load regulation is posed as a non-smooth dynamic optimization problem. By introducing a set of auxiliary differential equations and applying a time-scaling transformation, we formulate an equivalent optimization problem with semi-infinite constraints. Existing algorithms can be applied to solve this smooth semi-infinite optimization problem. The existence of an optimal solution is also established. For illustration, the optimal switching instants for a practical switched-capacitor DC/DC power converter are determined using this approach. 相似文献
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This paper proposes a switching control strategy (SCS) for a bidirectional DC/DC converter. The aim of this strategy is managing the power that an ultra-capacitor (UC) has to deliver or absorb following a power reference required by the driving cycle ECE-15 of an electric vehicle (EV). For that purpose, the converter is modelled as a switched linear system. Based on hysteresis and logic switching, a switching rule is designed. Necessary and sufficient conditions for the existence of the switching rule are established. Simulation and experimental results of a 1 kW converter are shown to demonstrate the feasibility of this strategy. 相似文献
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介绍了航空电源系统中谐波污染问题、谐波抑制技术的研究现状及发展趋势,分析了三相整流电路中的谐波和无功功率,完成了滤波模式对三相整流电路PF和THD影响的仿真研究,完成了正激DC/DC变换器拓扑对整流系统PF值及THD影响的仿真研究。仿真结果表明,合理设置输入输出滤波器可有效抑制三相整流电路的谐波,提高功率因数;双路并联双管正激DC/DC变换器可消除开关频率附近的谐波,同时减小功率管的应力。 相似文献
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