摘要：在采用PWM功放的控制系统中，进行PWM开关频率和死区设置时，不仅要参考功率晶体管的开关时间等参数，还要考虑控制系统的其他要求。如果PWM的频率和死区设置不当，将影响控制系统的稳定性，影响脉动电流的“动力润滑”效果，甚至导致电机过热损坏。文章依据理论分析和仿真，对工程实践中PWM功放的频率和死区设置给出了合理的指导建议，具有较强的参考价值。
关键词：脉宽调制（PWM）；开关频率；死区；饱和非线性；脉动电流
Abstract: When setting switching frequency and deadtime of PWM amplifier in a control system, the engineers should not only reference the switching time of transistors but also pay attention on to some other requirement of the control system. If the frequency and deadtime of PWM set improperly, will affect the stability of the control system, influence the “lubrication” effect of ripple current, and even lead to DC motor overheating damage. On the basis of theoretical analysis and simulation, this paper provided a few guidelines about how to set the PWM frequency and deadtime in engineering practice, it has strong reference value.
Key words: pulsewidth modulation；switching frequency；deadtime；saturation nonlinearity；ripple current