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DC/DC变换器主要向着高效率、高功率密度、高质量输出和高可靠性方向发展.移相全桥软开关变换器的研究在这方面也显得较为突出.本文主要针对变换器的性能进行研究,设计一种能够实现升压的高效隔离DC-DC变换器,并使之广泛应用. 相似文献
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ZVZCS移相全桥PWM变换器实现了超前桥臂的零电压开关(ZVS)与滞后桥臂的零电流开关(ZCS),其软开关的实现条件比ZVS移相全桥与ZCS移相全桥要好。文章全面分析了这种变换器的工作原理,讨论了实现软开关的条件,设计关键参数并利用SIMetrix软件进行了仿真研究。 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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采用移相全桥ZVS变换器作为高压开关电源的主变换拓扑。首先介绍了移相全桥ZVS变换电路以及如何处理高频高压变压器分布参数,然后基于BUCK电路的小信号,给出了移相全桥ZVS电路的小信号模型和PID补偿器的设计方法。然后分析了数字控制系统的工作原理并基于数字重设计法,给出了数字补偿器控制参数的设计方法。最后通过仿真对电路设计进行了验证。 相似文献
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对移相全桥零电压零电流开关(Zero-Voltage and Zero-Current Switch,ZVZCS)变换器数学模型进行深入分析,提出用专家系统PID控制器实现对变换器开关管导通相序和占空比的改变。详细介绍了移相全桥ZVZCS变换器的拓扑结构、工作模态、小信号模型推导以及专家系统PID的设计规则,最后用Simulink仿真验证了算法的正确性和可行性,并对结果进行了分析讨论。 相似文献
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光伏发电系统中DC-DC变换器的作用是使太阳能光伏电池电压达到光伏系统逆变环节的直流母线电压的要求。其中,全桥结构具有功率开关管电压应力小、变压器利用率高、容易实现软开关的特点,现将标准的全桥DC-DC变换器重新设计成串联形式,用计算机仿真来评估其工作状况,结果表明,开关的工作峰值电流被显著地减小了,减少了损耗并提高了... 相似文献
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A 1.6-kW, 110-kHz DC-DC converter optimized for IGBT's 总被引:7,自引:0,他引:7
A full bridge DC-DC power converter using a zero current and zero-voltage switching technique is described. This circuit utilizes the characteristics of the IGBT to achieve power and frequency combinations that are much higher than previously reported for this device. Experimental results are included for a 1.6 kW, 110 kHz converter with 95% efficiency 相似文献
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移相全桥变换器具有开关器件电压应力小、功率变压器利用率高等特点,目前常被应用在中大功率的开关电源中.本文主要针对基本移相控制ZVS全桥变换器拓扑结构优缺点,介绍四种典型的改进方案,并对这四种典型电路的拓扑结构的优缺点进行了对比. 相似文献
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A novel prototype is presented of a two-switch forward soft-switching PWM DC-DC power converter with reduced switching and conduction power losses, which can operate under two soft commutations of zero voltage and zero current of full bridge circuit topology 相似文献
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主要介绍48kw大功率高频开关电源的研制。阐述国内外开关电源的现状.分析全桥移相变换器的工作原理和软开关技术的实现。软开关能降低开关损耗,提高电路效率。给出电源系统的整体设计及主要器件的选择。试验结果表明,该装置完全满足设计要求,并成功应用于电镀生产线。 相似文献
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Seong-Jeub Jeon Gyu-Hyeong Cho 《Electronics letters》1999,35(13):1043-1044
A new zero voltage and zero current switching (ZVZCS) full bridge DC-DC converter with transformer isolation is proposed for arc welding machines. The proposed DC-DC converter uses an auxiliary transformer to obtain ZCS for the leading leg, which provides load current control capability even under short circuit conditions. The power rating of the auxiliary transformer is ~10% or more of the main transformer. The operation is verified by experiments 相似文献
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为使电源输出纹波小、效率高,设计了以DC-DC变换电路串联LDO电路构成数字式直流稳压电源,将开关电源和线性电源结合起来,兼顾两者的优点。采用模糊自适应PID控制算法对DC-DC变换电路和LDO电路进行控制,得到了满意效果。实验表明,该系统具有输出稳定性好、精度高、效率高等特点,具有较好的实用价值。 相似文献
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Boost电路和半桥、全桥电路相结合的电流馈电DC-DC变换器被广泛地使用在UPS、燃料电池等低输入电压、高输出电压的系统中。文中介绍了一种新型的有源钳位电路,在实现有源钳位的同时对所有的开关管实现了ZVS开通,提高了变换器的效率。 相似文献
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The hot carrier effects on the 0.25 μm high voltage LDMOS has been examined by the accelerated stress experiment. Although the model parameters changed slightly, the switching performances degraded significantly, which have been simulated with the compact models extracted from the test devices by ICCAP. A full bridge DC-DC converter with the compact models was proposed in Cadence SpectreRF. The simulated results show that the efficiency of the full bridge DC-DC converter degraded significantly due to the hot carrier effects. 相似文献
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Seong-Jeub Jeon Gyu-Hyeong Cho 《Power Electronics, IEEE Transactions on》2001,16(5):573-580
A new primary-side-assisted zero-voltage and zero-current switching full bridge DC-DC converter with transformer isolation is proposed. The proposed DC-DC converter uses only one auxiliary transformer and two diodes to obtain ZCS for the leading leg. It has a simple and robust structure, and load current control capability even in short circuit conditions, The possibility of magnetic saturation due to asymmetricity of circuits or transient phenomena is greatly reduced, which is a very attractive feature in DC-DC converters with transformer isolation. The power rating of the auxiliary transformer is about 10% of that of the main transformer. Operation of a 12 kW prototype designed for welding application was verified by experiments 相似文献