Portable Power Supply With Dual-Voltage Output for Quiet Power Tools
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Solution Overview
Problem
Traditional power tools used in areas with inconvenient access to electricity often rely on noisy gasoline engines for power generation, and high-voltage battery packs increase tool size and reduce convenience.
Innovation Solution
A portable power supply device with a built-in power battery, multiple output terminals, and an electrical energy conversion unit that allows for charging and power distribution to both battery packs and power tools, featuring a lithium iron phosphate battery and noise reduction capabilities, enabling quiet operation and extended battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-voltage and high-power battery pack is used to supply power to the power tool, then the power supply capability is improved, but the overall volume of the power tool body and battery pack becomes larger
Solution Approach 1:
The system divides the power supply function into two separate components: a portable power supply device (external power source) and a battery pack (integrated power source). The battery pack maintains its compact size for portability, while the portable power supply device provides high-voltage and high-power output when needed, eliminating the need to increase battery pack volume for higher power capability.
Solution Approach 2:
The battery pack is designed with dual functionality: it can operate independently as a portable power supply for tools, and it can also be connected to the portable power supply device to receive power from external sources (AC or solar). This multi-functionality allows the same compact battery pack to serve both portable operation and high-power operation needs.
2Power
If a gasoline engine is used to generate power for the power tool, then the power supply capability is improved, but the operating noise becomes very loud
Solution Approach 1:
The invention replaces the mechanical combustion system (gasoline engine) with an electrical power conversion system. The portable power supply device uses an inverter to convert DC electrical energy from the battery pack into AC electrical energy, eliminating the loud mechanical combustion process while maintaining high power output capability.
Solution Approach 2:
The system changes the energy conversion parameters from chemical-to-mechanical energy conversion (gasoline engine) to electrical-to-mechanical or electrical-to-electrical conversion (inverter). This parameter change fundamentally reduces noise levels while preserving the ability to deliver high power to the tool.
3Productivity
If the first output terminal voltage is increased to charge battery packs efficiently, then the charging speed is improved, but the compatibility with standard battery packs may be reduced
Solution Approach 1:
The portable power supply device incorporates a controllable voltage output system that can dynamically adjust between different voltage levels. The first output terminal can switch between a first voltage level (greater than 20V) for fast charging and a second voltage level (less than or equal to 20V) for compatibility with standard battery packs, allowing the system to adapt to different charging needs.
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
The portable power supply device significantly reduces noise levels and enhances battery life, providing a convenient and efficient power solution for power tools in various environments while minimizing tool weight and size.
Implementation Method 1
a power battery; the first output voltage of the first output terminal is less than the second output voltage of the second output terminal; and the first output voltage is greater than 20 V
Implementation Method 2
an electrical energy conversion unit configured to convert the electrical energy inputted from the electrical energy input terminal into electrical energy for charging the battery pack
Implementation Method 3
the inverter module is connected between the power battery and the third output terminal and used for outputting AC electrical energy
Data Source
AI summary
A portable power supply device includes a housing; a power battery; an electrical energy input terminal into which at least electrical energy for charging the power battery is inputted; a first output terminal configured to be capable of being connected to at least a battery pack; and a second output terminal configured to be capable of being connected to at least a direct current (DC) power tool. The power battery is built into the housing, the first output voltage of the first output terminal is less than the second output voltage of the second output terminal, and the first output voltage is greater than 20 V.