Hybrid Power Supply with Constant Current Generator
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Solution Overview
Problem
Existing power supply systems face challenges in maintaining stable operation due to fluctuations in load current, which affect the generator section's output and lead to unstable charging of power storage devices, particularly in systems using fuel cells and solar cells, where current and voltage fluctuations are significant and often result in overcharging or inefficient charging.
Innovation Solution
A power supply system that includes a generator section, a current converter section to maintain constant current output, a charging and discharging control circuit for the power storage section, and a control section that manages the output from both the generator and storage sections, allowing switching between power supply from the generator alone or both sections based on load current demands, ensuring stable operation and preventing overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power storage device is charged using a constant voltage and constant current converter, then the charging efficiency is improved, but the charge voltage and charge current fluctuate by the amount of charge, leading to potential overcharging
Solution Approach 1:
The patent implements dynamic switching between constant voltage charging mode and constant current charging mode based on real-time detection of charge amount. The charging control circuit automatically transitions from CV mode to CC mode when the charge amount reaches a predetermined threshold, optimizing both charging efficiency and preventing overcharging through adaptive mode switching
Solution Approach 2:
The patent employs a feedback mechanism where the charging control circuit continuously monitors the charge amount and automatically switches between charging modes based on this feedback. When the charge amount reaches the predetermined value, the system transitions from constant voltage mode to constant current mode, ensuring stable charging operation and preventing overcharging
2Reliability
If the output current from the generator section is maintained as constant, then the stable operation of the generator section is secured, but the load current fluctuations cannot be fully compensated
Solution Approach 1:
The patent combines the generator section with a power storage device to form a hybrid power supply system. The power storage device compensates for load current fluctuations, while the generator maintains constant current operation, achieving both stability and adaptability through the synergistic combination of two power sources
Solution Approach 2:
The power storage device acts as an intermediary between the generator section and the load. It absorbs current fluctuations from the load and provides supplemental current when needed, allowing the generator to operate at constant current while still meeting varying load demands
3Power
If the charge current increases to meet higher load demands, then the power demand is satisfied, but the power storage device may be overcharged
Solution Approach 1:
The patent implements dynamic charging mode switching that transitions from constant voltage mode to constant current mode based on charge amount. This dynamic adjustment ensures high power output capability while preventing overcharging by automatically reducing charge current when the charge amount reaches the predetermined threshold
Data Source
AI summary
An output from a generator section is controlled by a current converter section to be a constant current. Charging and discharging of a power storage section is controlled by a charge/discharge control circuit. Thereby, even in a case where a current value required by a load is high, the case can be dealt with in the manner that, while an output current from the generator section is being maintained constant, the output from the generator section and an output from the power storage section can be caused to function in cooperation with each other. Further, charging and discharging of the power storage section can be performed by a simplified device.