Quick starting method for multi-module LCC high-voltage power supply

Abstract

The invention discloses a multi-module LCC high-voltage power supply rapid starting method, and the method comprises the steps: obtaining the initial starting current value of an LCC resonant converter of each module, and calculating the initial starting period of each module; sampling an input voltage value, an output voltage value and a total output voltage of the LCC resonant converter of each module after the initial starting period is ended, and calculating a track starting current value of each module; according to the input voltage value, the output voltage value and the track starting current value of each module, calculating the switching period of each module, quickly starting each module until the output voltage value of each module reaches a set threshold value, and uniformly setting the switching frequency of each module; the output voltage and the total output voltage of each module and the phase difference of the resonance current between two adjacent modules are sampled, and after PI voltage sharing, PI frequency modulation and PI phase control are carried out on the output voltage and the total output voltage of each module and the phase difference of the resonance current between two adjacent modules, voltage stabilization, voltage sharing and ripple offset are carried out on each module.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for quickly starting a multi-module LCC high-voltage power supply. Background technique [0002] The multi-module LCC high-voltage power supply is a topology different from the traditional single-module LCC high-voltage power supply. Through the combination of multiple single-module high-voltage power supplies, the input is connected in parallel and the output is connected in series, so as to achieve the purpose of outputting higher voltage and higher power. [0003] As the core component of X-ray equipment, high-voltage power supply directly determines the actual working effect of X-ray equipment. Lower output voltage ripple means more stable X-ray energy, which can significantly improve the actual working effect of X-rays; faster start-up speed means fewer harmful and useless soft rays, and can achieve more complex working model. Multi-module LCC high-volt...

AI Technical Summary

Problems solved by technology

[0004] However, due to the uneven parameters among the modules, it is difficult to only consider the quick start of the multi-module LCC high-voltage power supply like a single module, and it is necessary to take into account the voltage equalization capability during the start-up process.

Traditional PI control is limited by its own low loop bandwidth and cannot achieve fast startup

For example, the fuzzy control method proposed by the Chinese patent CN201410447446.9 can improve the stability and response speed of a single-module high-voltage power supply, but cannot achieve rapid start-up and voltage equalization of multiple modules.

Another example is the multi-stage PI control method proposed by the Chinese patent CN201911141805.7, which cannot simultaneously realize voltage equalization under the condition of fast start.

Traditional methods are limited by the bandwidth impact of closed-loop control, and it is difficult to achieve fast startup

Images