Boost Converter Control Method for Voltage Oscillation Suppression
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Solution Overview
Problem
Existing boost converter technologies experience output voltage oscillations during both power running and regenerative running due to negative resistance characteristics and response delays, which are not adequately addressed by setting target output voltages based solely on motor driving losses.
Innovation Solution
A control method for the boost converter that calculates a lower limit voltage to prevent oscillations by considering the required electric power and response characteristics, setting the target output voltage to a value equal to or higher than this lower limit, and adjusting the duty ratio to maintain stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the target output voltage is set to reduce motor driving loss, then the efficiency during power running is improved, but the output voltage oscillates during regenerative running due to response delay
Solution Approach 1:
The control method dynamically adjusts the target output voltage based on the motor's operating state (power running or regenerative running). By detecting the operating state and selecting different target voltages from a map, the system adapts to changing conditions, preventing voltage oscillations during regenerative running while maintaining efficiency during power running.
Solution Approach 2:
The invention changes the target output voltage parameter according to the motor's operating state. A voltage map is created that specifies different target voltages for power running and regenerative running conditions. This parameter change ensures stable voltage output by selecting appropriate voltage levels that prevent oscillations under different operating conditions.
2Loss of energy
If the target output voltage is set based on motor driving loss reduction, then the efficiency is improved, but voltage oscillation occurs during power running due to negative resistance characteristic
Solution Approach 1:
The control system dynamically selects the target output voltage based on the detected operating state. During power running, the system identifies this state and selects an appropriate target voltage from the map that accounts for the negative resistance characteristic, thereby preventing voltage oscillations while maintaining efficient motor operation.
Solution Approach 2:
The control method uses feedback from the motor's operating state detection to adjust the target output voltage. By continuously monitoring whether the motor is in power running or regenerative running state, the system selects the most appropriate target voltage, creating a closed-loop control that prevents oscillations and maintains stability.
3Device complexity
If a single target output voltage is used for both power running and regenerative running, then the control is simplified, but voltage oscillation occurs in one or both operating modes
Solution Approach 1:
The invention segments the operating region into distinct power running and regenerative running regions. By dividing the control space and creating separate target voltage settings for each region, the system achieves stable voltage output in both modes. This segmentation allows the control to address the specific characteristics of each operating mode without compromising overall simplicity.
Data Source
AI summary
A boost converter control method in one aspect of the present invention is the control method of the boost converter that boosts a voltage input from a power supply and supplies a boosted voltage to a load-side. The control method of the boost converter is securing an output electric power required according to an operation point of a motor connected to the load-side, calculating a lower limit voltage value at which the output voltage of the boost converter does not oscillate, setting a target output voltage of the boost converter to a value equal to or higher than the lower limit voltage, and controlling the boost converter so as to output a voltage according to the target output voltage.