Digital control method of boost AC-DC constant voltage power supply

Abstract

The invention discloses a digital control method of a Boost AC-DC constant voltage power supply, relates to a digital control method of a PFC converter based on a Boost topology, and belongs to the technical field of power generation, transformation or distribution. The digital control method is realized by FPGA including prediction module, PI module, current control module, triangular wave PWM module and soft start module. The prediction algorithm can completely eliminate the influence of ADC sampling delay and calculation duty cycle delay, thereby improving the dynamic response performance of the entire system; the current control module algorithm is simple and easy to implement, and can realize the input current to follow the input voltage, thereby improving The power factor of the system; the triangular wave PWM control method is conducive to obtaining the average value of the inductor current in the switching cycle, reducing the prediction error, improving the sampling accuracy of the ADC, thereby reducing the system output voltage ripple; soft start enables the system to start smoothly and prevents the system from Overshoot occurs at start-up.

Description

technical field [0001] The invention discloses a digital control method of a Boost AC-DC constant voltage power supply, relates to a digital control method of a PFC converter based on a Boost topology, and belongs to the technical field of power generation, power transformation or power distribution. Background technique [0002] In today's society, with the promulgation of specifications related to PF indicators, more and more power supplies adopt power factor correction (Power Factor Correction, PFC) technology. I believe that with the development of the times, people have higher and higher requirements for the purity of the power grid, and will also have higher and higher requirements for power factor. Require. [0003] PFC can be divided into active PFC and passive PFC. Passive PFC uses inductors and capacitors to form a filter network for power factor correction. Active PFC uses a special power factor correction circuit to control the on-off of the power switch tube ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention of the present invention is to provide the digital control method of Boost AC-DC constant voltage power supply for the deficiency of above-mentioned background technology, realize the rapid dynamic response of the system and low cost while improving power factor with simple structure and lower cost. Ripple output solves the technical problem that existing active PFC control schemes need to improve dynamic response performance and reduce output ripple through complex structures and algorithms

Images