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针对传统PWM调制具有轻载下效率低的缺点 ,论文作者提出一种新的高效调制模式———脉冲跨周调制PSM模式 .本文对这种新的PSM开关变换器调制模式进行了包括大信号解析模型、离散模型和相平面模型的大信号建模工作 ,并借助变换器的解析解、离散模型和相平面分析法对PSM变换器开环 /闭环系统的瞬态响应特性进行了分析 .研究表明PSM变换器不仅较PWM调制模式轻载下效率高 ,而且具有响应速度更快 ,抗干扰性更好的特点
Aiming at the shortcomings of traditional PWM modulation, such as low efficiency under light load, the author of the paper proposes a new efficient modulation mode, pulse-span modulation PSM mode.In this paper, the new modulation mode of PSM switching converter including large signal Analytical model, discrete model and phase plane model of large signal modeling work, and with the help of the analytical solution of the converter, discrete model and phase plane analysis of open-loop / closed-loop system of PSM converter transient response characteristics are analyzed. It shows that the PSM converter is not only more efficient at light load than the PWM modulation mode, but also has the characteristics of faster response and better anti-interference