Battery Charge Difference Control with Diode Power Supply Lines
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Solution Overview
Problem
Existing power supply devices for aircraft and similar applications face complexity and increased costs due to the need for precise control of battery charge states and power distribution, leading to complications in the control system and potential battery deterioration.
Innovation Solution
A power supply device with a diode in each power supply line allowing electric power to flow only in one direction, a difference calculating unit to assess charge state differences, and an electric power summing unit to control the drive source, simplifying the control system and reducing costs by eliminating the need for individual battery management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distribution proportions of electric power to batteries are determined based on respective charge states with precise control, then battery performance is improved, but control system complexity increases and cost increases
Solution Approach 1:
The patent divides the power supply system into independent power supply lines, each with its own diode and battery. This segmentation allows each line to operate independently with simple individual control rather than requiring complex centralized control of power distribution proportions, thus improving reliability while reducing control system complexity.
Solution Approach 2:
The diode in each power supply line automatically prevents reverse current flow without requiring active control. The system uses passive components (diodes) to self-regulate power flow direction, eliminating the need for complex active control mechanisms and reducing both device complexity and cost while maintaining battery performance.
2Reliability
If precise control of charging and discharging is implemented to converge charge states, then battery performance is improved, but control device complexity and cost increase
Solution Approach 1:
The patent uses inexpensive passive diodes instead of expensive active control devices for each power supply line. The diodes provide sufficient protection and control functionality at minimal cost, eliminating the need for expensive precision control devices while still achieving the goal of controlled charging and discharging to maintain battery performance.
3Reliability
If individual battery management devices are used to control charging and discharging, then charge state convergence is achieved, but system complexity increases
Solution Approach 1:
The patent merges the control function into the power supply line structure itself by incorporating diodes directly in series with each battery. This integration eliminates the need for separate individual battery management devices, achieving charge state convergence through the unified power supply architecture rather than through multiple independent control devices, thus reducing overall system complexity.
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 stable and efficient charging and discharging of batteries, preventing over-charging and over-discharging, reducing system complexity, and improving charging/discharging efficiency while maintaining battery health.
Implementation Method 1
a diode that is provided upstream from the battery in the corresponding power supply line and allows electric power to flow in only one direction from upstream to downstream of the power supply line
Data Source
AI summary
A power supply device includes a power generator, a drive source, a plurality of power supply lines, a plurality of batteries, a difference calculating unit 11, a difference summing unit 12, and an electric power summing unit 13. The difference calculating unit 11 is configured to calculate differences D1, D2, D3, and D4 between a target charge state set for each battery and an estimated charge state. The difference summing unit 12 is configured to sum the differences D1, D2, D3, and D4 calculated by the difference calculating unit 11. The electric power summing unit 13 is configured to sum the charge state calculated by the difference summing unit 12 and electric power used for the electric loads. A control unit 9 controls the drive source such that electric power calculated by the electric power summing unit 13 is generated by the power generator.