Voltage Conversion Device Control Mode Switching
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Solution Overview
Problem
Conventional voltage conversion devices do not consider the relationship between power source output characteristics and the switching of control modes, leading to instability in voltage or current control.
Innovation Solution
A voltage conversion device with a control unit that selectively switches between voltage control and current control modes based on the current-voltage characteristics of the power source, using threshold values to determine the appropriate control mode and adjust gains for feedback control, thereby stabilizing the operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control mode is selectively switched based on output current threshold without considering power source characteristics, then the control can be simplified, but the stability of voltage or current control deteriorates
Solution Approach 1:
The patent applies parameter changes by using multiple threshold values (first threshold and second threshold) that define different operating regions based on output current. The control mode switching depends on the relationship between actual output current and these threshold values, allowing the system to adapt control parameters according to the power source's current-voltage characteristics in different operating regions.
Solution Approach 2:
The patent implements feedback by continuously monitoring the output current of the power source and comparing it with preset threshold values. Based on this feedback, the control unit dynamically switches between voltage control mode and current control mode, ensuring that the control strategy adapts to the actual operating conditions and maintains stability.
2Ease of operation
If conventional constant voltage control is used until output current reaches predetermined value, then the control process is simple, but the controllability deteriorates when output current becomes excessive
Solution Approach 1:
The patent segments the control process into distinct regions based on output current thresholds. The first region (output current ≤ first threshold) uses voltage control mode, the second region (first threshold < output current ≤ second threshold) uses current control mode, and the third region (output current > second threshold) uses voltage control mode again. This segmentation allows each control mode to be optimized for its specific operating range.
Solution Approach 2:
The patent makes the control mode dynamic by allowing switching between voltage control and current control based on real-time output current measurements. The system can transition from voltage control to current control and back to voltage control as operating conditions change, providing adaptive controllability rather than a fixed control strategy.
Data Source
AI summary
A voltage conversion device can selectively switch between and perform voltage control and current control of a voltage conversion unit in a suitable manner in which output characteristics of a power source are reflected. A control unit (10) of the voltage conversion device (1) selectively switches the control mode of the voltage conversion unit (3) to a current control mode or a voltage control mode on the basis of current-voltage characteristics of the power source (2) and performs a control process of each control mode. The power source (2) has current-voltage characteristics such that the output voltage changes according to the output current and such that a rate of change of the output voltage with respect to a change of the output current changes according to the output current.