Fuel Cell Power Supply Interrupting Charge via Current Threshold
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Solution Overview
Problem
Conventional fuel cell power supply systems are inefficient when charging electronic devices as they continue to supply power beyond the fully charged state, leading to wastage of fuel and reduced efficiency due to decreased current draw during the charging process.
Innovation Solution
A controller is integrated into the power supply apparatus to monitor and interrupt the power supply when the current drawn by the electronic device falls below a predetermined threshold, categorizing devices based on initial current draw and using user-selectable charge levels to optimize fuel cell operation and conserve fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel cell continues to supply power beyond the fully charged state, then the battery reaches full charge, but fuel wastage increases and efficiency decreases
Solution Approach 1:
The controller continuously monitors the charging current drawn by the battery and uses this feedback to determine when to interrupt power supply. When the current falls below a threshold indicating the battery is nearly full, the controller shuts down the fuel cell, preventing further fuel consumption while ensuring the battery is adequately charged.
Solution Approach 2:
Instead of allowing the battery to reach 100% charge, the system intentionally stops charging at a slightly lower level (partial action). This approach accepts that the battery may not be completely full in exchange for significant fuel savings, as the marginal gain from the final portion of charging is minimal compared to the fuel consumed.
2Reliability
If the fuel cell operates when the battery draws reduced current, then the battery reaches full charge, but the fuel cell operates inefficiently
Solution Approach 1:
The controller is pre-programmed with knowledge of the typical charging curve and current thresholds that indicate near-full charge. This allows the system to take preliminary action by shutting down the fuel cell before the battery actually reaches full charge, avoiding the inefficient operation phase where the fuel cell would consume excessive fuel for minimal charging benefit.
3Loss of energy
If the controller interrupts power supply early, then fuel efficiency improves, but the battery may not reach full charge
Solution Approach 1:
The system uses the battery's own electrical characteristics (current draw) to determine when to stop charging. The battery effectively signals its own charge status through the declining current it draws, and the controller responds by interrupting power supply at the appropriate moment, achieving a balance between fuel efficiency and adequate charging without requiring complex external monitoring.
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 enhances the efficiency of the fuel cell by shutting down power supply before the battery reaches full charge, reducing fuel wastage and maintaining optimal operation, while allowing user control over charge levels for convenience.
Implementation Method 1
Conventional electrochemical fuel cells convert fuel and oxidant, generally both in the form of gaseous streams, into electrical energy and a reaction product
Implementation Method 2
Protons (that is, hydrogen ions) are conducted through the membrane
Data Source
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AI summary
A power supply apparatus for providing electrical power, the power supply apparatus configured to be coupled to an electronic device to supply power thereto to charge a battery of the electronic device, the apparatus comprising a fuel cell configured to receive a supply of a fuel for generating said electrical power, the apparatus further including a controller configured to determine the power flow to the electronic device to interrupt the supply of power to the electronic device prior to the battery of the electronic device reaching a fully charged state.