Power Converter Current Compensation Across Switching Modes
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Solution Overview
Problem
The existing power conversion devices face challenges in mitigating changes in the current control system characteristics due to changes in operation modes or circuit switching, leading to inefficiencies in current adjustment on the input or output sides.
Innovation Solution
A power conversion device is designed with a switching circuit, a signal generator, a current controller, an operation mode detector, and a compensator that adjusts the instruction values to compensate for changes in the current control system gain based on detected operation modes, thereby stabilizing the current control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switching circuit is used to switch between step-up chopper and step-down chopper for wide DC voltage range, then the adaptability is improved, but the change in current control system characteristics cannot be mitigated
Solution Approach 1:
The patent applies dynamics by making the current control system adaptable to different operation modes through real-time detection and dynamic adjustment of control parameters. The operation mode detector dynamically identifies whether the system is in step-up or step-down mode, and the controller dynamically adjusts instruction values based on detected operation modes, allowing the system to maintain stable current control characteristics across different voltage conversion modes without requiring fixed circuit configurations.
2Adaptability or versatility
If different operation instruction generation methods are used for multi-functionality, then the adaptability is improved, but the change in current control system characteristics cannot be mitigated
Solution Approach 1:
The patent applies parameter changes by modifying control parameters (instruction values) based on the detected operation mode. The controller changes the instruction values for the switching elements differently depending on whether the system is operating in step-up or step-down mode, thereby adapting the control characteristics to match the current operation mode while maintaining overall system stability.
Solution Approach 2:
The patent implements feedback through the operation mode detector that continuously monitors the operation mode and provides this information back to the controller. This feedback loop enables the controller to adjust the instruction values appropriately based on the current operation mode, ensuring that the current control system characteristics remain stable despite changes in operation mode.
Data Source
AI summary
A power conversion device includes: a switching circuit; a signal generator to generate a switching signal of a switching element based on a first instruction value; a current controller to generate a second instruction value based on a deviation between a current target value and the current flowing through the switching circuit such that the current flowing through the switching circuit approaches the current target value; an operation mode detector to detect an operation mode based on the first instruction value; and a compensator to adjust the second instruction value so as to compensate a gain between the deviation and an amount of a change in the current of the switching circuit. The compensator adjusts the second instruction value so as to suppress a change in the gain based on the operation mode, and outputs the first instruction value.