A current - doubler - rectifier ( cdr ) zvs pwm h - fb tl converter is proposed in this paper , the proposed converter can achieve zvs for all the switches in a wide load range with the use of the energy stored in the output filter inductance , in the meanwhile , the voltage oscillation and voltage spike across the rectifier diodes resulted by the reverse recovery are eliminated 为了消除输出整流二极管反向恢复造成的的电压尖峰和振荡,同时使所有开关管在很宽的负载范围内实现zvs ,本文提出了倍流整流方式的zvspwmh - fbtl变换器。
1 ) the transformer leakage inductance will cause surge voltage across the switches . two clamp circuits are combined to solve this problem : lcd clamp circuit , in which the voltage across clamp capacitor is no reverse ; flyback clamp circuit , which consists of an additional flyback winding coupled with the boost inductor and a diode connected to the output terminal 本文综合了两种箝位电路: 1 ) lcd箝位电路,箝位电容上电压不反向; 2 )通过增加一个与升压电感耦合的反激线圈和一个连接到输出电容的整流二极管,构成反激箝位电路。
Firstly , the basic theory of full - bridge phase - shift zvs pwm converters are expatiated and another three kinds of circuits of full - bridge phase - shift zvs pwm converters are discussed . there are four kinds of problems which are emphasized : how to expand the zvs range ; how to reduce the circulation in the primary side of the transformer in order to minimize the on state losses ; how to decrease the loss of effective duty circle and how to eliminate the parasitic oscillation of the output rectifiers 本文首先分析了基本的全桥移相zvsdc dc变换器的工作原理，为解决滞后桥臂不易实现零电压开关( zvs )的情况，讨论了另外三种全桥移相zvsdc dc变换器的电路拓扑，重点分析并解决了四个方面的问题：如何扩大zvs的负载范围；减小变压器原边环流，降低变换器系统通态损耗；减少变压器次边有效占空比丢失；消除输出整流二极管的寄生振荡。
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。
Saturable inductance is introduced to eliminate the voltage swing and overshooting on the output rectifier diodes , then discusses its parameter design in detail ; find out the mechanism of the body diode ' s reverse recovery effect of the chopping switches , give out several relevant solutions and verified by experiments 为了消除输出整流二极管上的电压尖峰和振荡，同时为了使滞后桥臂的开关管能够在宽负载范围内实现软开关，给输出整流二极管串入了饱和电感，给出饱和电感的设计方法。
