A fast adjustment method of output response of dc-dc converter

Abstract

The invention relates to a method for quickly adjusting the output response of a DC-DC converter, which specifically includes the following steps: when the DC-DC converter specifies the output current I 0 ≤90% full scale current I m , the adaptive pulse selection module adopts the plane algorithm adjustment model to calculate the output pulse, and directly controls the output current of the DC-DC converter through the output pulse; when 90% of the full-scale current I m <DC-DC converter specified output current I 0 ≤100% full scale current I m , the adaptive pulse selection module adopts PI to control the output pulse, and controls the output current of the DC-DC converter through the output pulse feedback. In this application, at different output current stages of the DC-DC converter, the self-adaptive pulse selection module selects whether to use the plane algorithm to adjust the model adjustment, or to use the PI control to adjust the pulse, and then achieve the purpose of adjusting the current, with fast output current response, bidirectional The switching response of the power supply application is fast, the system steady-state error is small, and the system dynamic performance is good, which can be widely used in occasions that require relatively high output response.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for quickly adjusting the output response of a DC-DC converter. Background technique [0002] DC / DC converters are often used in DC power applications. Closed-loop PI controllers are often used to adjust the output current. The system collects real-time output current and compares it with the given current. The error value is used as the input of PI control and adjusted by PI. Finally, the output of the controller is the modulated wave, and then PWM chopping is performed to obtain the drive signal of the power switch in the DC / DC main circuit to control the output current of the DC / DC. Due to the adjustment characteristics of the PI controller, the existing control scheme has the problem of overshoot and fast response that are difficult to balance, and the rapidity of the current system cannot meet some occasions that require the response time of the output cur...

AI Technical Summary

Problems solved by technology

Due to the adjustment characteristics of the PI controller, the existing control scheme has the problem of overshoot and fast response that are difficult to balance, and the rapidity of the current system cannot meet some occasions that require the response time of the output current, such as the charge and discharge detection of lithium batteries. process, current pulse output, etc.

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