DC-DC Converter Feedforward Control for Output Ripple Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
DC-DC converters face significant electrical interference and current ripple on the output side, particularly due to consumers connected to the low-voltage power supply system, which can cause operational faults and damage to connected assemblies.
Innovation Solution
A control device comprising a voltage regulator and a feedforward control device that generates two controlled variables, where the dynamic response of the feedforward control system is adapted based on the electrical current, effectively counteracting current ripple by adjusting the dependency of the second controlled variable on input voltage and setpoint voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a DC-DC converter transmits electrical energy from high-voltage to low-voltage power supply systems, then electrical energy transmission is achieved, but electrical interference and current ripple occur on the output side
Solution Approach 1:
The control device is divided into two independent control paths: a voltage regulator for voltage control and a feedforward control device for current control. This segmentation allows each controller to independently address its specific function, with the feedforward controller specifically targeting current ripple reduction while the voltage regulator maintains output voltage stability.
Solution Approach 2:
The feedforward control device determines the control variable for the DC-DC converter based on the electrical current in advance, before the current ripple affects the output. By calculating the required control action ahead of time based on predicted current conditions, the system can counteract current ripple proactively rather than reactively.
2Ease of operation
If consumers are connected to the low-voltage power supply system on the output side, then power supply functionality is provided, but operational faults and damage to connected assemblies can occur
Solution Approach 1:
The control device continuously monitors the electrical current in the DC-DC converter and uses this feedback to dynamically adjust the control variable through the feedforward control device. This closed-loop feedback mechanism ensures that current ripple is continuously detected and corrected, protecting connected consumers from harmful current fluctuations while maintaining continuous power supply functionality.
3Stability of the object's composition
If a voltage regulator is used for closed-loop control of the DC-DC converter, then output voltage stability is achieved, but current ripple on the output side is not sufficiently reduced
Solution Approach 1:
The control device merges two separate control mechanisms: the voltage regulator for maintaining output voltage stability and the feedforward control device for reducing current ripple. By combining these two control functions into a unified control system that processes both voltage and current information, the system achieves both voltage stability and current ripple reduction simultaneously.
Data Source
AI summary
The present invention relates to advanced control for a DC-to-DC converter. For this purpose, in the determination of a controlled variable for the control of the DC-to-DC converter, the control dynamics are adjusted according to an electric current through the DC-to-DC converter. In particular, it is possible to determine the controlled variable from a combination of a first controlled variable of a voltage controller and a second controlled variable of a feedforward control. In particular, the control dynamics of the feedforward control can be adjusted according to the electric current through the DC-to-DC converter. By adjusting the control dynamics according to current, it is possible to minimize possible current ripple on the output side.