Digital monocyclic control method of PFC converter

Abstract

The invention discloses a digital monocyclic control method of a PFC converter. The method comprises the following steps: firstly, sampling an output voltage and an inductor current, adopting a digital signal processor so that an output voltage sampling value passes by a voltage PI adjusting ring while utilizing the synchronous sampling function of the digital signal processor to finish the peak value sampling of the inductor current so as to ensure the monocyclic control requirements; and then obtaining a PWM control signal of a power device by a digital monocyclic core control algorithm. The digital monocyclic control method can be adopted to effectively simplify the digital control structure of PFC, improves the real-time computational capability and the control effect of a system and overcomes the adverse influence of discrete parameters of devices, such as operational amplifiers, capacitors, and the like in a traditional monocyclic control resettable integrator. In addition, the system fully keeps the accordance between a sampling interface and traditional PFC while fully keeping the advantages such as precisely controlled precision, perfect communication capability, and the like of traditional digital control.

Description

technical field [0001] The invention relates to a digital single-cycle control method of a PFC converter, which belongs to the technical field of power factor correction application and related digital control technology of electric energy conversion devices. Background technique [0002] The single-cycle control technology is a new type of large-signal and nonlinear control method proposed by American scholars Keyue M.Smedley and Slobodan Cuk. It uses the pulse modulation and nonlinear characteristics of the switching converter to achieve real-time voltage and current average value Instantaneous control can suppress input disturbance within one switching cycle, so that the output can effectively track the reference signal, and has the characteristics of fast response, good robustness and adaptability. Currently, the application of single-cycle control has involved various fields, such as DC / DC conversion, power factor correction, active power filter, uninterruptible power s...

AI Technical Summary

Problems solved by technology

[0003] In recent years, people have conducted in-depth research on the theory, application feasibility, modeling analysis, and steady-state and dynamic performance research of single-cycle control. However, the current research on single-cycle controllers is realized by means of analog circuits. , which has very high requirements for the selection of the operational amplifier in the resettable integrator and the control of the capacitor discharge time

It is difficult to realize the control, and the control accuracy is difficult to guarantee

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