Model-free control overview for switching power supplies
With the rapid development of power electronics technology, the relationship between power electronic devices and people's work and life is becoming increasingly close, and electronic devices cannot do without reliable power sources. Switching power supply is a type of power supply that utilizes modern power electronics technology to control the time ratio of switching transistors on and off, and maintain a stable output voltage. Switching power supply is generally composed of pulse width modulation (pWM) control IC and MOSFET. The control part of switch mode power supply is mostly designed and operated based on analog signals, but the disadvantage is poor anti-interference ability. Due to the rapid development of computer control technology, the processing and control of digital signals have shown obvious advantages: easy computer processing and control, greatly improved design flexibility, and convenient software debugging, resulting in the emergence of pID control.
Mathematical Model of Model free Control for Switching Power Supply
In control law design, it is generally necessary to establish a mathematical model of the dynamic system. The classical method requires that this mathematical model must be established in advance, and at least its structure must be determined in advance. And the more accurate the model, the better. In the design of model free control laws, the limitation of establishing mathematical models as accurately as possible in advance is overcome.
Our modeling process is carried out along with feedback control. The initial mathematical model can be imprecise, but it is necessary to ensure that the designed control law has a certain degree of convergence. The model free control law we designed is to model and control at the same time, obtain new observation data, then model and control. This continues to make the obtained mathematical model gradually more accurate, thereby improving the performance of the control law. We refer to this procedure as the integration of real-time modeling and feedback control.
