Fuel Cell Step-Up Converter Control for High Output
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Solution Overview
Problem
In fuel cell systems, when the secondary cell step-up converter breaks down, the output voltage from the fuel cell becomes lower than normal, making it difficult for users to obtain the desired output, especially when the requested output is higher than the secondary cell's output.
Innovation Solution
The fuel cell system employs a control device that executes interruption control, disconnecting the electrical connection between the fuel cell system and the secondary cell, allowing the fuel cell step-up converter to increase its output voltage beyond the secondary cell's output voltage during continuity control, ensuring a higher output voltage is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuity control is executed to output the input voltage from the secondary cell without stepping up, then the system maintains electrical connection and operates safely, but the output voltage is limited to the secondary cell's voltage level, making it impossible to obtain desired high output
Solution Approach 1:
The control device dynamically switches between continuity control and interruption control modes based on the requested output level. When high output is requested, the system transitions to interruption control, disconnecting the secondary cell and enabling the fuel cell step-up converter to operate independently and step up voltage beyond the secondary cell's voltage level.
Solution Approach 2:
The system changes the electrical connection state parameter between the fuel cell system and secondary cell. By switching from a connected state (continuity control) to a disconnected state (interruption control), the system enables different operating modes that allow the fuel cell step-up converter to achieve higher output voltages when needed.
2Productivity
If the fuel cell step-up converter operates with the secondary cell connected during continuity control, then the secondary cell can support the output, but when the requested output exceeds the secondary cell's capacity, the system cannot deliver the desired power
Solution Approach 1:
The system dynamically adjusts its configuration based on the requested output level. When the requested output exceeds the secondary cell's capacity, the control device switches to interruption control, dynamically reconfiguring the system to allow the fuel cell step-up converter to operate independently and deliver the higher required output.
Solution Approach 2:
The fuel cell step-up converter is designed to perform multiple functions: it can operate in conjunction with the secondary cell during continuity control for normal operation, and it can also operate independently during interruption control to provide high output when the secondary cell's capacity is insufficient, thus achieving multi-functionality and broader adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables users to obtain the desired output even when the requested power exceeds the secondary cell's capacity by stepping up the fuel cell's output voltage, while also prioritizing the secondary cell's remaining capacity to prevent breakdown.
Implementation Method 1
a fuel cell step-up converter that steps up the output voltage of a fuel cell
Implementation Method 2
a secondary cell step-up converter that steps up the output voltage of a secondary cell
Data Source
AI summary
A fuel cell system includes: a fuel cell; a fuel cell step-up converter having an input terminal, wherein the input terminal is connected to the fuel cell; a secondary cell; a secondary cell step-up converter having an input terminal an output terminal, wherein the input terminal is connected to the secondary cell. wherein the output terminal is connected to an output terminal of the fuel cell step-up converter; and a control device configured to control at least the fuel cell step-up converter and the secondary cell step-up converter to control the fuel cell system, wherein, the control device executes interruption control when the control device executes continuity control and an output of the fuel cell system is requested to be greater than an output of the secondary cell in the continuity control, wherein the continuity control is a control to control the secondary cell step-up converter to output an input voltage from the secondary cell without stepping up the input voltage, wherein the interruption control is a control to interrupt an electrical connection between the fuel cell system and the secondary cell.