共查询到19条相似文献,搜索用时 109 毫秒
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Zbigniew Krzemnski Krzysztof Kowalewski 《电力电子》2005,3(3):48-52
本文介绍了零电压零电流开关全桥(ZVZCS)DC\DC变换器。通过添加辅助电路解决了软开关谐振变换器的开关损耗问题。本文叙述了用触发式电感和LC电路的实际应用来实现零电压和零电流开关全桥变换器。通过数学模型分析了在DC\DC变换操作中变换器的参数对其的影响,用仿真进行了整流参数和工作点的优化。实现了10kW的DC\DC变换器实验,并在文章中给出了结果。 相似文献
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提出一种新型的零电压零电流转换(ZCZVT)的正激拓扑。拓扑工作频率为300kHz,能实现主开关管的零电压开通(ZVS)和零电流关断(ZCS),同时辅助开关管也能实现零电流关断(ZCS),且变压器的磁通复位不需要辅助绕组。文章进行了拓扑的稳态分析,并且讨论了谐振电路的参数设计。最后,在研制一台48V输入、12V/100W输出样机的基础上,实验验证这种新型正激ZCZVT PWM DC-DC变换器的软开关特性。 相似文献
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介绍仅用一个主开关管及一个辅助开关提高设备的输入侧三相交流功率因数的零电流关断(ZCS)升压型变换器的基本电路,说明升压电感电流工作在不连续状态的必要性。采用三相整流电压的6次谐波前馈(注入),以减小三相电源的5次庇波电流。减小主开关管关断损耗采用了零电流关断电路。 相似文献
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本文所示的“TWitt”变换器具有一个正向变换器传递函数,并能有 效地工作在高开关频率,因为它的所有开关对所有的变换都可实现零电压开关(ZVS)(见图1)。由于它具有高开关频率能力、高效率和简单的结构,所以可以提供非常高的功率密度。另外的好处是它消除了二极管反向恢复效应,而这种效应在其他ZVS变换器中(如流行的ZVS相移调制全桥变换器)是一个问题。由于变换器具有消除反向恢复的能力,所以没有缓冲器时也可以工作。 本电路的一个缺点是它具有类似于连续方式回扫变换器的脉动输入和输出电流,但是没有回扫右半面零。增加第二个耦合电感器或回扫变压器,就可使输出电流在整个开关周期接近恒定(在短暂的开关转换期间除外)。适当地设计所加的变压器,其输出电流斜波斜率变为接近零。对于不同于额定输入电压的输入电压,其电流斜波很小,但不为零。 相似文献
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本论文介绍了一种改进型的ZVZCS全桥变换器,此变换器在变压器原边增加了一个隔直电容,通过Saber仿真软件分析,改进型的ZVZCS全桥变换器实现了超前桥臂的零电压开关和滞后桥臂的零电流开关,电力电子器件应力减小,该拓扑结构在煤矿蓄电池充电装置应用广泛,前景良好。 相似文献
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《Power Electronics, IEEE Transactions on》2006,21(5):1328-1335
A novel zero-voltage and zero-current switching (ZVZCS) full-bridge phase-shifted pulsewidth modulation (PWM) converter using insulated gate bipolar transistors (IGBTs) with auxiliary transformer is proposed to improve the properties of the previously presented converters. ZVZCS for all power switches is achieved for full load range from no-load to short circuit by adding active energy recovery snubber and auxiliary circuits. The principle of operation is explained and analyzed and experimental results are presented. The features and design considerations of the converter are verified on a 3-kW, 50-kHz IGBT based experimental circuit. 相似文献
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Novel zero-voltage and zero-current-switching (ZVZCS) full-bridge PWM converter using coupled output inductor 总被引:2,自引:0,他引:2
Hang-Seok Choi Jung-Won Kim Bo Hyung Cho 《Power Electronics, IEEE Transactions on》2002,17(5):641-648
A novel zero-voltage and zero-current-switching (ZVZCS) full-bridge pulse-width-modulated (PWM) converter is proposed to improve the previously proposed ZVZCS full-bridge PWM converters. By employing a simple auxiliary circuit with neither lossy components nor active switches, soft-switching of the primary switches is achieved. The proposed converter has many advantages such as simple auxiliary circuit, high efficiency, low voltage stress of the rectifier diode and self-adjustment of the circulating current, which make the proposed converter attractive for the high voltage and high power applications. The principles of operation and design considerations are presented and verified on the 4 kW experimental converter operating at 80 kHz. 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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Jung-Goo Cho Ju-Won Baek Chang-Yong Jeong Dong-Wook Yoo Kee-Yeon Joe 《Power Electronics, IEEE Transactions on》2000,15(2):250-257
A novel zero voltage and zero current switching (ZVZCS) full bridge (FB) pulse width modulation (PWM) converter is proposed to improve the demerits of the previously presented ZVZCS-FB-PWM converters, such as use of lossy components or additional active switches. A simple auxiliary circuit which includes neither lossy components nor active switches provides ZVZCS conditions to primary switches, ZVS for leading-leg switches and ZCS for lagging-leg switches. Many advantages including simple circuit topology, high efficiency, and low cost make the new converter attractive for high power (>2 kW) applications. The operation, analysis, features and design considerations are illustrated and verified on a 2.5 kW, 100 kHz insulated gate bipolar transistor (IGBT) based experimental circuit 相似文献
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针对传统ZVZCS-PWMDC/DC全桥变换器在实现滞后桥臂开关管零电流开关过程中,存在着辅助谐振电路附加损耗较大,软开关实现方式复杂,功率开关管电压应力和电流应力高等缺点,介绍了一种新型次级箝位移相控制的ZVZCSPWMDC/DC全桥变换器。文中分析了该变换器实现软开关的原理,同时设计了变换器数字控制系统,控制器采用LPC2214型ARM芯片,并通过一台实验样机验证了这种软开关变换器相关理论的正确性以及该数字控制系统的可行性。 相似文献
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TingTing Song Nianci Huang 《Power Electronics, IEEE Transactions on》2005,20(2):286-291
A novel zero-voltage and zero-current-switching (ZVZCS) full-bridge pulse-width modulation converter is proposed. The ZCS condition of the lagging-leg is obtained by a simple secondary auxiliary circuit resetting the primary current during the freewheeling stage. The auxiliary circuit's capacitor is charged by the center tape of the secondary through a diode, and the capacitor's voltage is clamped through another diode to output capacitor, thus, the voltage stress on the rectifier is clamped. There are neither additional active switches nor resistances in the auxiliary circuit, which makes the proposed converter efficient. 相似文献
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一种新型的零电压零电流三电平变换器的研究 总被引:1,自引:0,他引:1
针对采用IGBT的软开关三电平变换器中IGBT关断过程存在的电流拖尾现象,以及基本三电平拓扑变压器次级存在的电压过冲和电压振荡现象,提出了改进型ZVZCS三电平结构。该结构在基于拓扑的三电平桥臂侧和两电平桥臂侧分别加入了一个无源辅助网络,三电平桥臂侧的辅助变压器在续流阶段为主变压器初级电流回零提供了条件,两电平桥臂的谐振电感和箍位二极管有效地抑制了主变压器次级电压的过冲现象。详细分析了改进拓扑的工作原理、工作模态,以及辅助网络的工作特点,并研制了实验样机,验证了理论分析的正确性以及改进拓扑的可行性。 相似文献