基于无模型自适应控制的数字电源研究

Digital Power Supply Based on Model-Free Adaptive Control

近年来,开关电源正朝着智能化、数字化方向发展,数字电源需要精准可靠的控制算法。针对不易建立数学模型的非线性电源系统较难选择合适的控制算法的问题,对无模型自适应控制(Model-Free Adaptive Control,MFAC)算法进行了研究,并基于该算法设计实现了一款180 V输入、2000 V输出的数字电源。该电源以STM32F103为主控芯片、LLC拓扑为主电路,通过MFAC算法改变PWM占空比,并实现对电源系统的监测、控制、通信、显示等功能。实验表明,将MFAC算法应用在LLC拓扑中能够对电源系统实现较好地控制,并能够稳定可靠工作、达到指标要求。实验验证了MFAC算法在LLC拓扑中应用的可行性。

Switching power supply is developing towards intelligence and digitalization,with digital power supply calling for accurate and reliable control algorithm.To solve the problem of choosing an appropriate control algorithm for nonlinear power supply system difficult to establish mathematical model,a model-free adaptive control(MFAC)algorithm is studied,and a digital power supply with 180 V input and 2000 V output is designed and implemented based on this algorithm.The power supply takes STM32F103 as the main control chip and LLC topology as the main circuit,and chan-ges the PWM duty cycle through model-free adaptive algorithm,and realizes the functions of monito-ring,controlling,communicating and displaying the power supply system.The experiment shows that the application of MFAC algorithm in LLC topology can control the power system well,and it can work stably and reliably and meet specific requirements.The experiment also verifies the feasi-bility of the application of model-free adaptive control algorithm in LLC topology.