The converter not only keeps all the characteristics of the basic zvs pwm h - fb tl converter , but also eliminates the voltage oscillation and voltage spike across the rectifier diodes in both three - level mode and two - level mode , leading to a reduced voltage stress of the rectifier diodes 本文在基本zvspwmh - fbtl变换器中引入两只箝位二极管,无论是在三电平模式还是在两电平模式,都可以消除输出整流二极管反向恢复造成的电压尖峰和振荡,降低了输出整流管的电压应力。
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With the stringent requirement of low output voltage and high output current , semiconductor diode is necessarily replaced by synchronous rectifier to minimum voltage drop . because the existed driving schemes can not drive srs properly , two novel driving schemes for synchronous rectifiers in magnetic amplifier post regulating circuit are proposed in this paper 已有的同步整流管驱动电路主要面对多路输出的主输出电路，而应用磁放大器调节的辅助输出电路同步整流管的驱动，现有的方法存在磁放大器调节与同步整流管驱动的失配，降低了开关电源的效率。
Compare to the operation under the dcm mode , the power switches of the inverter under the ccm mode has lower peak current and rms current , so the efficiency can be improved . as the synchronous rectification strategy can reduce the conduction losses of the rectifier , and also due to the zvs realization of all synchronous rectifiers , the 采用非互补导通控制,在ccm模式下由于功率管电流峰值和有效值的减小,逆变器变换效率较dcm模式下有所提高;另外, ccm模式下,反激逆变器采用同步整流控制,减小了整流二极管的导通压降,并且电路中同步整流管可实现零电压开通。
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A new type high efficiency synchronous step - up dc / dc converter for hand - held device is designed in this thesis . it works in the pfm ( pulse frequency modulating ) mode , and its switching frequency can up to 500 khz . it offers a built - in synchronous rectifier that reduces size and cost by eliminating the need for an external schottky diode and improves overall efficiency by minimizing losses 本文设计了一种用于移动电子设备的高效同步整流的dc / dc升压芯片,该芯片采用pfm (脉冲周期调制)调制方式,工作频率最高可达500khz ,内部集成功率管作为同步整流管,代替传统的肖特基二极管,导通电阻仅有0 . 4
And power loss analysis of srs and the layout design related to srs are very important to the proper design . with a small signal mathematic model of half - bridge converter , the relationship between performance of power supply and frequency domain characteristics of the system is analyzed . based on the above study and some simulation the system design is completed 文中在给出了结合单绕组自驱动方案的对称半桥变换器稳态原理分析、同步整流管损耗分析暨选择原则、同步整流管相关电路的布局设计后，建立了对称半桥变换器的小信号数学模型，分析了电源系统时域性能指标与频域特性之间的联系，在此基础上完成了系统的设计。
The company mainly produces high - tension and low - tension electric equipment , thyristors electrical machinery soft starter , automatic regulating silicon piles etc . it developed the technology with own patent adopting sun shape heat tube radiators with steam and water separated , and developed the integrated power module unit including thyristors and rectifiers with the technology . the products organization is novel , and it conducts heat rapidly and has solved the difficult problems of heat dissipation in generator excitation and exchange power 公司主要生产高低压成套电器低压动态无功补偿装置晶闸管电机软启动自动调压硅堆等产品。研制开发出了“日”字形汽水分离式热管散热，并利用该技术开发了晶闸管整流管一体化功率组件，结构新颖，传热迅速，为发电机励磁交流调功等领域解决了器件散热难题，产品的各项性能均处于国内外领先水平。
