Asynchronously switching control method for Boost converter considering computational delay

To deal with the computational delay of control laws and high frequency switching in the circuit of Boost converter, a finite-time asynchronous control method based on time switching was proposed to realize a stable control of the converter. First, the asynchronous control model for the Boost converter with time delay between the switching action and the circuit topology switching was established by a switched system method. Then, the duty ratio was used to realize the hybrid switching control of the converter by combining the average dwell time method with the multiple Lyapunov function. Finally, based on the principle of finite-time control, the quantitative relationships among the calculation time of the control law, the dwell time of the switching signal and the stable operation time of the system were derived. Results show that the total switching times (5 times) of the asynchronous switching control are less than that (11 times) of the synchronous switching control, and there is no high-frequency vibration phenomenon when there is a time delay of 0.05 ms between the switching signal of the circuit system and that of the actual control law within 0.9 ms running time. The asynchronously switching control method can effectively suppress the high-frequency vibration of the circuit output response near the equilibrium point. Thus, the method has better control performance. © 2021, Editorial Department of Journal of Southeast University. All right reserved.