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单片同步整流芯片中功率MOSFET分析及电路仿真 总被引:1,自引:1,他引:0
同步整流技术是目前开关电源中一种新型的转换效率提升技术。遵循转换效率最高原则.使用器件结构仿真软件Medici对同步整流DC-DC变换器中的功率MOSFET进行结构分析,并得出选择建议。同时在Cadence中对同步整流技术相关电路进行仿真分析,得到了同步整流技术中的功率器件优化结果和外围线路结构。 相似文献
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同步整流降压式DC/DC转换器部采用控制器和外接功率MOSFET的结构。控制器生产商会在数据资料中给出参数齐全的应用电路,但用户的使用条件经常与典型应用电路不同,要根据实际情况改变功率MOSFET的参数。 相似文献
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<正> 同步整流技术是采用通态电阻极低的功率 MOSFET来取代整流二极管,因此大大降低整流电路的功率损耗,提高 DC-DC 变换器的效率,满足低压、大电流整流的需要。LM5025是 NS 公司推出的一款应用同步整流技术的正激式变换器 IC。利用它可直接构成高效率、低功耗、高可靠性、低压输入的 DC-DC 变换器,供通信、汽车和工业等设备使用。 相似文献
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一种新型降压式同步整流开关电源设计 总被引:1,自引:0,他引:1
设计了一种同时应用同步整流和ZVT软开关技术的新型开关电源变换电路。在整流部分应用阻抗更小的MOSFET代替传统二极管实现了同步整流。采用软开关技术实现了开关管的导通或关断时,在零电压或零电流条件下完成。同时,利用PSIM软件对所设计的拓扑结构进行了模拟仿真,仿真结果表明,所设计的电路有效提高了变换器的整体效率,并减少了物理器件损耗。 相似文献
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Kohama T. Ninomiya T. Shoyama M. Tymerski R. 《Power Electronics, IEEE Transactions on》2000,15(4):670-680
Problems of synchronous rectification in a parallel-module DC-DC power converter system are described. These include excessive power dissipation due to the bidirectional current flow capability of MOSFETs and abnormal oscillation due to the cross coupling of the MOSFETs used as synchronous rectifiers. The abnormal oscillation, which causes excessive voltage stress, is analyzed; the results of which are subsequently confirmed by experiment. Methods for solving the abnormal oscillation problem are discussed 相似文献
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Fernandez A. Sebastian J. Alou P. Cobos J.A. Rascon M. 《Power Electronics, IEEE Transactions on》2003,18(4):966-974
The aim of this paper is to study the performance of an AC/DC converter with low output voltage and low input current harmonic content. In order to obtain low output voltages with a high efficiency, synchronous rectification is mandatory. When the output voltage is low, it is very difficult to use self-driven synchronous rectification and additional windings are used to properly drive the metal oxide semiconductor field effect transmitters (MOSFETs). Besides this, IEC 1000-3-2 regulations impose low input current harmonic contents for power levels higher than 75 W. In this paper, a recently proposed synchronous rectification scheme is combined with a modified input current shaper to design a 100 W, 3.3 V AC/DC converter that complies with IEC 1000-3-2 regulations. The efficiency obtained in the prototype was very high for this application (86%) and both the size increase and the cost increase were quite low in comparison with the original topology with no synchronous rectification and no IEC 1000-3-2 compliance. 相似文献
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采用球栅阵列芯片尺寸封装技术和倒装芯片(Flip Chip,FC)技术构建了半桥集成电力电子模块(Integrated Power Electronics Module,IPEM),半桥FC-IPEM实现三维封装结构。采用阻抗测量法提取模块寄生电感和寄生电容,建立模块的寄生参数模型,对模块进行电气性能测试。结果表明:半桥FC-IPEM构成的同步整流Buck变换器输出滤波电感中的电流波动幅度小于0.6A。 相似文献
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Shen Z.J. Okada D.N. Lin F. Anderson S. Xu Cheng 《Power Electronics, IEEE Transactions on》2006,21(1):11-17
DC/DC converters to power future CPU cores mandate low-voltage power metal-oxide semiconductor field-effect transistors (MOSFETs) with ultra low on-resistance and gate charge. Conventional vertical trench MOSFETs cannot meet the challenge. In this paper, we introduce an alternative device solution, the large-area lateral power MOSFET with a unique metal interconnect scheme and a chip-scale package. We have designed and fabricated a family of lateral power MOSFETs including a sub-10 V class power MOSFET with a record-low R/sub DS(ON)/ of 1m/spl Omega/ at a gate voltage of 6V, approximately 50% of the lowest R/sub DS(ON)/ previously reported. The new device has a total gate charge Q/sub g/ of 22nC at 4.5V and a performance figures of merit of less than 30m/spl Omega/-nC, a 3/spl times/ improvement over the state of the art trench MOSFETs. This new MOSFET was used in a 100-W dc/dc converter as the synchronous rectifiers to achieve a 3.5-MHz pulse-width modulation switching frequency, 97%-99% efficiency, and a power density of 970W/in/sup 3/. The new lateral MOSEFT technology offers a viable solution for the next-generation, multimegahertz, high-density dc/dc converters for future CPU cores and many other high-performance power management applications. 相似文献