Cordless Power Tool USB Charging Interface
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Solution Overview
Problem
Cordless power tools face challenges in recharging batteries due to the need for access to conventional AC power outlets, which are often inconveniently located, necessitating the carrying of a battery charger and limiting portability.
Innovation Solution
Integration of a USB charging system that allows cordless power tools to be charged using standard USB power sources, such as from computers or USB power supplies, utilizing a charging circuit configured to receive and utilize USB power to recharge batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional AC power outlet charger is used, then the battery can be recharged, but the user must carry the charger and have access to AC outlets which are often inconveniently located
Solution Approach 1:
The power tool is designed with a universal USB charging interface that can accept power from multiple sources including USB wall adapters, computer USB ports, and power banks. This multi-functionality eliminates the need for a dedicated AC outlet charger, allowing users to recharge the battery using commonly available USB power sources anywhere in the world.
Solution Approach 2:
The charging function is extracted from the traditional AC-powered battery charger and integrated directly into the power tool itself through a USB charging circuit. This extraction eliminates the need for a separate external charger device, reducing what the user must carry while maintaining the ability to recharge the battery.
2Reliability
If AC power outlets are used for charging, then batteries can be recharged, but outlets are often in distant, inconvenient, and inaccessible locations relative to the work area
Solution Approach 1:
The USB charging interface provides universal compatibility with numerous power sources including portable power banks, USB wall adapters, and computer USB ports. This universality ensures that a reliable power source is accessible in virtually any location, not just places with AC outlets, maintaining battery recharging capability while dramatically improving accessibility.
Solution Approach 2:
The USB charging circuit acts as an intermediary between the battery and various power sources. Instead of requiring direct connection to AC outlets through a specialized charger, the USB interface mediates the power transfer using a standardized connection that works with multiple power source types, making power accessible in remote or mobile work areas.
3Duration of action of moving object
If a dedicated battery charger is provided, then continuous power tool usage can be ensured, but the charger must be carried along with the tool
Solution Approach 1:
The charging capability is extracted from the separate charger unit and integrated into the power tool's own structure. The USB charging circuit board and related components are built into the tool housing, eliminating the need to carry a separate charger while ensuring continuous usage capability through portable USB power sources.
Solution Approach 2:
The power tool becomes self-sufficient regarding charging by incorporating its own USB charging interface and circuitry. Instead of requiring an external charger to service the battery, the tool can service itself using any USB power source, eliminating the weight of a dedicated charger while maintaining continuous operation capability.
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
Enables cordless power tools to be charged from any location with a USB power source, enhancing portability and convenience by utilizing abundant and readily available USB adapters and cords.
Implementation Method 1
an electric motor (110) adapted to drive a work element (112); a rechargeable battery (108) configured to produce an output voltage capable of powering the electric motor (110)
Implementation Method 2
A USB charging system is provided that enables the cordless power tool (10) to be adapted to utilize USB power for charging the rechargeable battery (108)
Data Source
Figure 1~2
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Figure 4
AI summary
A power tool an electric motor retained within a housing. A rechargeable battery is retained within the housing that is operatively connected to the electric motor. A power input port is supported within the housing that is operatively connected to the rechargeable battery. The power input port is configured to supply power to the rechargeable battery from an external power source. The rechargeable battery comprises a lithium based battery, and the power input port comprises a universal serial bus (USB) port configured to receive a USB connector.