DC-DC Converter Dual-Loop Control for Robust Low-Ripple Output
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Solution Overview
Problem
Existing DC-to-DC converters face issues with poor robustness and significant system ripple due to inadequate control algorithms, particularly in dual-loop controllers based on proportional-integral algorithms.
Innovation Solution
Implement a DC-to-DC converter control method using a backstepping super-twisting algorithm, which involves constructing a state-space model, employing a backstepping control algorithm in the inner current loop, and a super-twisting sliding mode control algorithm in the outer voltage loop to regulate the converter's operation state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-loop controller based on proportional-integral algorithm is used, then the converter can regulate operation state, but the system exhibits poor robustness and significant ripple
Solution Approach 1:
The control system is segmented into two distinct loops: an inner current loop using backstepping control and an outer voltage loop using super-twisting sliding mode control. Each loop handles specific control objectives independently, allowing the current loop to manage ripple reduction while the voltage loop ensures robust voltage regulation, thereby resolving the contradiction between robustness and ripple suppression.
Solution Approach 2:
The patent combines two different control methodologies (backstepping control and super-twisting sliding mode control) into a composite control system. This composite approach leverages the strengths of both algorithms: backstepping provides systematic stability and ripple reduction, while sliding mode control delivers enhanced robustness against disturbances and parameter variations.
2Manufacturing precision
If proportional-integral control algorithm is used, then the converter can maintain operation, but the control precision and stability are insufficient
Solution Approach 1:
The patent transforms the control approach by changing the mathematical parameters and control laws used. Instead of traditional proportional-integral parameters, it employs backstepping control laws that systematically design virtual control variables and Lyapunov functions, enabling precise current control and improved stability margins through parameter optimization at each control stage.
Solution Approach 2:
The control system implements comprehensive feedback mechanisms where the inner current loop continuously monitors and adjusts inductor currents based on reference values, and the outer voltage loop adjusts duty cycles based on output voltage feedback. This multi-level feedback structure ensures both high control precision and system stability by constantly correcting deviations from desired operating points.
Data Source
AI summary
A DC-to-DC converter control method and system based on backstepping super-twisting, a device, and a storage medium are disclosed, the method including: constructing a state-space model of a DC-to-DC converter according to Kirchhoff's laws and a topological structure of the DC-to-DC converter; acquiring initial PWM wave control information by using a backstepping control algorithm in an inner current loop of the DC-to-DC converter according to the state-space model; processing the initial PWM wave control information by using a super-twisting sliding mode control algorithm in an outer voltage loop of the DC-to-DC converter based on the state-space model to obtain final PWM wave control information; and regulating an operation state of the DC-to-DC converter with the final PWM wave control information.