A Transient Response Enhancement Circuit for Step-Down Voltage Converter

Abstract

The utility model relates to a transient response enhancing circuit for a step-down voltage converter, which belongs to the field of electronic circuits. The present invention uses the transient jump detection module to detect the output voltage of the step-down voltage converter, and generates the first control signal when the output voltage is detected to increase, and generates the second control signal when the output voltage is detected to decrease, thereby automatically Adaptively detect the time when the step-down voltage converter responds to the load jump; the compensation voltage prediction operation module is used to predict the size of the adjusted compensation voltage and superimpose the adjusted compensation voltage to the step-down voltage converter through the internal active compensation module Adjusting the duty cycle of the step-down voltage converter, setting the drive control and inserting the logic module can further improve the response speed. The invention can dynamically improve the working bandwidth of the step-down voltage converter, accelerate the transient response and recovery of the step-down voltage converter, reduce the voltage fluctuation caused in the loop adjustment process, and have wide application range.

Description

technical field [0001] The invention belongs to the field of basic electronic circuits, and in particular relates to a transient response enhancing circuit for a step-down voltage converter. Background technique [0002] In the system design of a step-down transformer, in order to adjust the output voltage, except for the hysteretic mode voltage converter, the system generally adjusts the output voltage indirectly by adjusting the duty cycle. Generally, in order to maintain system stability, the duty cycle The rate of change of can't change too fast. However, the fluctuation of the output voltage caused by the load jump is essentially due to the fact that the output current of the system cannot follow the change of the load current rapidly and stably. [0003] In order to speed up the adjustment of the output current, the existing system usually introduces a zero point in the loop to speed up the loop response and increase the system cut-off frequency; however, in order to ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low cut-off frequency design of traditional step-down voltage converters and long recovery time during load switching or load jumping, the present invention proposes a transient response enhancement circuit for step-down voltage converters, which can be used in On the basis of not affecting the loop characteristics and stability of the original system, the moment when the load current jumps is detected by detecting the moment when the output voltage of the step-down voltage converter changes. According to the external input and output conditions and the response time of the transient jump The length adaptively predicts the appropriate level of the compensation voltage to be compensated in the step-down voltage converter, and finally speeds up the stability of the system, equivalently realizing the adjustable dynamic bandwidth of the system, and speeding up the transient state of the step-down voltage converter system Response and recovery, reducing the voltage fluctuation caused by the loop adjustment process, optimizing the bandwidth of the step-down converter during the transient jump, and improving the system's cut-off frequency

Images