RF Wireless Power Distribution for Cordless Tools
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Solution Overview
Problem
Corded power tools have limited portability and range due to the need for a direct physical and electrical connection to a power source, while cordless tools are limited by battery power storage capacity and the requirement for discrete chargers.
Innovation Solution
A wireless power distribution system using RF signals transmitted by a power transmitter that can be received by power harvesters in battery packs or tools, allowing for charging or direct power supply without physical connections, with features like threshold detection and ambient light-powered devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corded power tools are used, then power supply reliability is improved, but portability deteriorates
Solution Approach 1:
The patent replaces the mechanical electrical connection system (physical cord connection) with a wireless electromagnetic field-based power transmission system. The power transmitter generates RF electromagnetic signals that are received by the power harvester in the tool, eliminating the need for physical cord connection while maintaining reliable power supply.
Solution Approach 2:
The patent introduces RF electromagnetic signals as an intermediary medium to transfer power between the power source and the tool. The power transmitter converts electrical power to RF signals, which are then received and converted back to electrical power by the power harvester, enabling wireless power transmission.
2Ease of operation
If cordless power tools with battery packs are used, then portability is improved, but power storage capacity deteriorates
Solution Approach 1:
The patent enables preliminary charging of battery packs by placing them in the charging case, which contains a power harvester that wirelessly receives power from the transmitter and charges the battery pack before it is needed. This allows the battery to be recharged in advance without requiring physical connection to a wall outlet.
Solution Approach 2:
The charging case serves multiple functions: it stores the battery pack when not in use, provides wireless charging capability through its integrated power harvester, and can also directly power tools when the battery is depleted. This multi-functional design eliminates the need for separate chargers.
3Adaptability or versatility
If replaceable battery packs are used, then adaptability is improved, but device complexity deteriorates
Solution Approach 1:
The patent merges the charging case with the power transmitter by integrating a power harvester into the case. This allows the case to wirelessly charge battery packs without requiring external chargers or complex wiring, simplifying the overall system while maintaining battery replaceability across different tools.
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
Enhances the portability and range of power tools by enabling wireless charging and power supply, reducing the need for discrete chargers and improving battery management through efficient energy transfer.
Implementation Method 1
The power transmitter transmits radio frequency ('RF') power signals to the power tools that are within transmission range of the power transmitter
Implementation Method 2
The receivers receive the RF power signals and convert the RF power signals into direct current
Data Source
AI summary
A wireless power distribution system and method for power tools and other battery-powered devices. The system includes a power transmitter and a plurality of power harvesters or receivers. The receivers are located in power tools, battery packs that are attachable to and detachable from the power tools, a device or case that is interfaceable with the power tool or battery pack, conventionally-sized batteries, or other battery-powered devices. The power transmitter transmits radio frequency (“RF”) power signals to the receivers that are within transmission range of the power transmitter. The receivers receive the RF power signals and convert the RF power signals into direct current. The direct current is used to charge a battery, directly power a tool, etc.