Bi-directional Converter for Direct DC Power Supply
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Solution Overview
Problem
Existing energy storage systems decrease efficiency when supplying power to DC loads due to the need for a separate adapter to invert AC power into DC power.
Innovation Solution
An energy storage system incorporating a bi-directional converter and integration controller that converts power from a first battery into DC power, allowing direct supply to a DC load without inversion, and also converts power from a second battery to the first battery during charge mode, eliminating the need for a separate adapter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If AC power is supplied to AC load and inverted into DC power for DC load through separate adapter, then DC load can receive power, but power supply efficiency decreases
Solution Approach 1:
The bi-directional converter is designed to perform multiple functions: it can supply DC power directly to DC loads, convert DC to AC for AC loads, and enable bidirectional power flow between the first battery and second battery. This multi-functionality eliminates the need for separate adapters and improves overall system efficiency.
Solution Approach 2:
The patent merges the functions of the separate adapter and the main power conversion system into a single bi-directional converter. By integrating DC-DC conversion and DC-AC conversion capabilities in one device, power loss is reduced and system complexity is minimized.
2Ease of operation
If separate adapter is used to invert AC power into DC power, then DC load can be powered, but system complexity increases
Solution Approach 1:
The bi-directional converter serves as a universal power management device that handles both AC and DC loads, as well as battery charging and discharging operations, through a single integrated system rather than requiring separate dedicated devices for each function.
Solution Approach 2:
Multiple power conversion functions (DC-DC, DC-AC, bidirectional battery power flow) are merged into the single bi-directional converter, simplifying the overall system architecture and reducing the number of components required.
3Loss of energy
If first battery supplies power to both AC and DC loads through bi-directional converter, then direct DC power supply is possible, but battery management complexity increases
Solution Approach 1:
The integration controller implements a universal control strategy that manages multiple operating modes (discharge mode for AC and DC loads, charge mode from AC grid or second battery) within a single control framework, handling complex battery management tasks through unified control logic.
Solution Approach 2:
The integration controller employs feedback mechanisms to monitor battery state of charge, power demand from AC and DC loads, and grid conditions, dynamically adjusting power flow distribution to optimize efficiency while maintaining safe and reliable operation.
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 increases system efficiency by eliminating the need for a separate adapter for inversion, ensuring efficient power supply to both AC and DC loads.
Implementation Method 1
a first battery, and a bi-directional converter connected to the first battery, where the bi-directional converter is configured to convert power from the first battery into DC power
Implementation Method 2
power of the second battery is converted into a DC power by the bi-directional converter and the converted DC power is supplied to the first battery
Data Source
AI summary
An energy storage system is disclosed. The system can supply DC power from a battery to a DC load or from the DC load to the battery without inverting an AC power to the DC power.