共查询到19条相似文献,搜索用时 156 毫秒
1.
2.
3.
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
4.
5.
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
6.
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
7.
ZVZCS移相全桥PWM变换器实现了超前桥臂零电压开关(ZVS)和滞后桥臂零电流开关(ZCS),具有结构简单、占空比丢失较小、软开关较容易实现等特点。文章全面分析了该变换器的工作原理、讨论实现软开关的条件,设计了主要参数,然后利用SIMetrix仿真软件对电路进行仿真,通过波形验证了参数设计合理、变换器实现ZVZCS。 相似文献
8.
本文介绍了一种新的高功率双向隔离式DC/DC变换器。DC/DC转换器使用基于氮化镓(GaN)的功率开关器件。本文对10 kW GaN大功率DC/DC变换器的拓扑结构进行了优化,参数化和分析,并通过仿真和验证了其有效性。它由两个单相全桥电路、两个输入输出电感和一个高频变压器组成。高频变压器在实现两个全桥变换器之间的电流隔离方面起着至关重要的作用。使用MATLAB仿真软件对10 kW的变换器进行了建模。MATLAB仿真结果验证了变换器的性能适合于高功率应用并能实现轻负载条件下的零电压开通(ZVS)和零电流关断(ZCS)。然后,设计了一个7 kW的实验原型,以验证所设计拓扑的有效性。 相似文献
9.
电流模式控制移相全桥零电压软开关(ZVS)DC/DC功率变换器 总被引:1,自引:0,他引:1
本文介绍一种新型的高频DC/DC开关功率变换器,它采用电流模式移相PWM控制,在较大的负载范围内实现了开关器件的零电压软开关(ZVS),并给出了仿真主电路和主要波形。 相似文献
10.
对于移相全桥零电压开关PWM变换器,在全负载范围内实现所有开关器件零电压开关和减少占空比丢失之间是矛盾的。如果在电路中增加一个辅助电路,根据负载情况在续流期间为滞后桥臂的零电压开关提供能量,能在全负载范围内实现所有开关器件的零电压开关和减少占空比丢失,但电路中存在严重的环流问题。文中提出新的拓扑结构通过增加一个双向开关和相应的驱动电路,有效地减少了环流带来的损耗。实例分析和仿真验证了这种拓扑的优点。 相似文献
11.
介绍了基于控制芯片UC3875的全桥电路设计,阐述了UC3875在全桥变换器电路中的应用,说明了控制电路和功率变压器的设计。 相似文献
12.
Eun-Soo Kim Yoon-Ho Kim 《Industrial Electronics, IEEE Transactions on》2002,49(5):1120-1127
The conventional high-frequency phase-shifted zero-voltage-switching (ZVS) full-bridge DC/DC converter has a disadvantage, in that a circulating current flows through transformer and switching devices during the freewheeling interval. Due to this circulating current, RMS current stress, conduction losses of the transformer and switching devices are increased. To alleviate this problem, this paper proposes an improved zero-voltage zero-current switching (ZVZCS) phase-shifted full-bridge (FB) DC/DC converter with a modified energy-recovery snubber (ERS) attached at the secondary side of transformer. Also, the small signal model of the proposed ZVZCS FB DC/DC converter is derived by incorporating the effects introduced by a transformer leakage inductance and an ERS to achieve ZVZCS. Both analysis and experiment are performed to verify the proposed topology by implementing a 7-kW (120 VDC, 58 A) 30-kHz insulated-gate-bipolar-transistor-based experimental circuit. 相似文献
13.
14.
《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
15.
用PWM芯片实现全桥移相ZVS隔离DC/DC变换器的研究 总被引:1,自引:1,他引:0
简述了市场上现有移相控制器的简单情况,分析了全桥移相的工作原理,进而介绍了采用常规PWM控制芯片及全桥驱动器HIP4081A实现50w/500kHz全桥移相ZVS隔离DC/DC变换器,通过有效的利用变压器漏感、MOSFET的输出电感以及MOSFET的体二极管实现ZVS,大幅度降低了开关损耗、热损耗、EMI和RFI。通过深入细致的实验观察,验证了理论设计的正确性、合理性,并给出了相关的实验波形和实验结果分析。 相似文献
16.
This paper describes a bidirectional isolated dc-dc converter considered as a core circuit of 3.3-kV/6.6-kV high-power-density power conversion systems in the next generation. The dc-dc converter is intended to use power switching devices based on silicon carbide (SiC) and/or gallium nitride, which will be available on the market in the near future. A 350-V, 10-kW and 20 kHz dc-dc converter is designed, constructed and tested. It consists of two single-phase full-bridge converters with the latest trench-gate insulated gate bipolar transistors and a 20-kHz transformer with a nano-crystalline soft-magnetic material core and litz wires. The transformer plays an essential role in achieving galvanic isolation between the two full-bridge converters. The overall efficiency from the dc-input to dc-output terminals is accurately measured to be as high as 97%, excluding gate drive and control circuit losses from the whole loss. Moreover, loss analysis is carried out to estimate effectiveness in using SiC-based power switching devices. Loss analysis clarifies that the use of SiC-based power devices may bring a significant reduction in conducting and switching losses to the dc-dc converter. As a result, the overall efficiency may reach 99% or higher 相似文献
17.
《Power Electronics, IEEE Transactions on》2008,23(6):2828-2837
18.
Current-Fed Resonant Full-Bridge Boost DC/AC/DC Converter 总被引:1,自引:0,他引:1