Fuel Cell Power Switching for Stable Auxiliary Device Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The voltage generated by a fuel cell can fluctuate significantly due to factors like sweep currents and power generation conditions, necessitating a power adjustment function on the auxiliary device side, which increases costs.
Innovation Solution
A power supply system that includes a fuel cell, a power storage device, a converter, and a controller. The controller acquires the states of the fuel cell and the power storage device, selects the appropriate power source for the auxiliary device, and controls the converter to switch between power supply from the fuel cell and the power storage device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power is directly supplied from fuel cell to auxiliary device, then power supply simplicity is improved, but voltage fluctuation causes auxiliary device cost increase
Solution Approach 1:
A DC-DC converter is introduced as an intermediary device between the fuel cell and the auxiliary device. The converter includes a controller that monitors fuel cell voltage and adjusts the duty ratio of the switching element to regulate output voltage, thereby isolating the auxiliary device from fuel cell voltage fluctuations and avoiding the need for expensive voltage adjustment circuits in the auxiliary device.
Solution Approach 2:
The controller dynamically changes the duty ratio parameter of the switching element in the DC-DC converter based on real-time fuel cell voltage measurements. By adjusting this parameter, the converter maintains a stable output voltage to the auxiliary device regardless of fuel cell voltage variations, solving the voltage fluctuation problem without increasing auxiliary device complexity.
2Stability of the object's composition
If voltage adjustment function is added to auxiliary device, then voltage stability is improved, but auxiliary device cost increases
Solution Approach 1:
The voltage adjustment function is transferred from the auxiliary device to the DC-DC converter, which acts as an intermediary. The converter's controller regulates the switching element's duty ratio to maintain stable output voltage, eliminating the need for expensive voltage adjustment circuits in the auxiliary device while still achieving voltage stability.
Solution Approach 2:
The DC-DC converter performs self-regulation by monitoring its own output voltage and adjusting the switching element's duty ratio accordingly. This self-service mechanism maintains voltage stability without requiring additional control circuits or components in the auxiliary device, thereby reducing overall system cost.
3Stability of the object's composition
If DC-DC converter is introduced, then voltage stability for auxiliary device is improved, but power supply system complexity increases
Solution Approach 1:
The DC-DC converter is designed to perform multiple functions: voltage regulation for the auxiliary device, power management for the load device, and fuel cell monitoring. By consolidating these functions into a single controller, the system avoids the need for multiple separate control circuits, thereby reducing overall system complexity while maintaining output voltage stability.
Solution Approach 2:
The controller of the DC-DC converter is integrated with the fuel cell system control, merging voltage regulation, power management, and fuel cell monitoring functions into a single control unit. This consolidation reduces the number of separate components and control circuits needed, offsetting the added complexity of the converter itself.
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 configuration allows for the appropriate supply of power to auxiliary devices while minimizing the increase in costs associated with the auxiliary device, thereby enhancing cost-effectiveness and versatility.
Implementation Method 1
a fuel cell capable of generating power
Implementation Method 2
a converter that converts power from the fuel cell or the power storage device and switches between supply of power from the fuel cell to the auxiliary device and supply of power from the power storage device to the auxiliary device
Data Source
AI summary
A power supply system of the embodiment includes a fuel cell which is able to generate power, a power storage device which stores the power generated by the fuel cell, a converter which converts power from the fuel cell or the power storage device and switches between supply of power from the fuel cell to an auxiliary device and supply of power from the power storage device to the auxiliary device, and a controller which controls at least the switching of the converter.