Power Storage System Dynamic Charging Switching
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Solution Overview
Problem
Existing power storage systems face inefficiencies in charging storage batteries to higher voltages, particularly when the storage battery voltage is low, leading to increased conversion loss and prolonged charging times due to the use of boost converters.
Innovation Solution
A power storage system that includes a power generation element, a storage battery, a DC/DC converter, and a switch unit controlled by a changeover unit to directly supply power from the power generation element to the storage battery when its voltage is low, switching to the DC/DC converter when the voltage exceeds a threshold, optimizing charging efficiency and reducing conversion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a boost converter is used to charge the storage battery when its voltage is low, then the storage battery can be charged to the required voltage, but the conversion loss increases and charging time is prolonged
Solution Approach 1:
The patent applies dynamics by making the power supply path configurable between two modes: direct connection mode and boost converter mode. The system dynamically switches between these modes based on the storage battery voltage level. When the storage battery voltage is low (below threshold), the system uses direct connection to avoid high conversion loss. When the voltage exceeds the threshold, the boost converter is engaged to achieve the required voltage. This dynamic adaptation resolves the contradiction by optimizing the power supply method according to real-time voltage conditions.
Solution Approach 2:
The patent changes the operating parameters of the power supply system based on the storage battery voltage state. By monitoring the voltage parameter and switching between direct connection and boost conversion based on a threshold value, the system optimizes charging efficiency. This parameter-based control strategy allows the system to avoid excessive conversion loss at low voltages while still achieving the required voltage level when necessary.
2Power
If a boost converter is used to increase the storage battery voltage, then the required voltage level is achieved, but the charging process takes longer
Solution Approach 1:
The system dynamically selects the power supply mode based on the storage battery voltage. When voltage is low, direct connection is used for fast charging. When voltage exceeds the threshold, the boost converter is activated to achieve the required voltage level. This dynamic switching optimizes both voltage achievement and charging speed, resolving the contradiction between power level and productivity.
Solution Approach 2:
The patent applies preliminary action by first attempting direct connection charging when the storage battery voltage is low, which is faster and more efficient. Only when the voltage rises above the threshold does the system engage the boost converter. This preliminary use of the faster charging method maximizes charging speed while still achieving the required voltage level when necessary.
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 approach allows for rapid voltage increase of the storage battery without significant conversion loss, even with low power generation from low illuminance dye-sensitized power generation elements, thereby shortening charging time and enhancing system efficiency.
Implementation Method 1
a DC/DC converter that converts an output voltage from the power generation element into a predetermined voltage
Implementation Method 2
a power generation element performing environmental power generation
Data Source
AI summary
A power storage system includes: a power generation element that performs environmental power generation; a storage battery that is supplied with power generated by the power generation element; a DC/DC converter that converts an output voltage from the power generation element into a predetermined voltage; a first switch unit that switches whether directly supply the output voltage from the power generation element to the storage battery or to supply thereto via the DC/DC converter; and a first changeover unit that compares a voltage of the storage battery with a first threshold voltage, and controls the first switch unit according to a comparison result, in a case where a voltage of the voltage or higher of the storage battery bringing the DC/DC converter into a main boost mode is the first threshold voltage.