The temperature range is - 30 ~ 80 . the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis . then based on the conventional pfm control scheme , a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established 然后在传统的脉冲频率调制方式的基础上,分析了一种离散脉冲频率调制方式,并建立了这种调制方式下升压型dc / dc变换器在电流连续( ccm )工作模式和电流断续( dcm )工作模式的状态空间平均模型。
The twelve kinds of modes and equivalent circuits of voltage mode ac - ac mode ac / ac converters with high frequency link within one high frequency switching period are carefully analyses . by using the state - space averaging approach , the converter ' s averaging model is presented , and the design criterion of key circuit parameters and the output characteristic curve are given 以全桥桥式拓扑为例，论述了单极性移相控制的原理、单极性移相控制电压源交?交型高频环节ac ac变换器在一个高频开关周期内的十二个工作模式及其等效电路。采用状态空间平均法建立了变换器平均模型，获得了关键电路参数的设计准则和变换器的外特性曲线。
