Power Tool Light Unit with Timer-Based Brightness Control
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Solution Overview
Problem
Handheld power tools often operate in varying light conditions, and existing solutions do not effectively provide a reliable lighting system that remains functional even when the tool is not in use, making it difficult for users to see the work area or locate the tool in dark environments.
Innovation Solution
A power tool design incorporating a light unit with a control circuit that allows for adjustable brightness levels and a timer function, enabling the light to remain illuminated at a lower brightness when the tool is not in use, and resetting if the tool is reactivated before the timer expires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light unit is kept illuminated continuously to improve visibility and tool location, then the illumination availability is improved, but the energy consumption increases
Solution Approach 1:
The light unit operates in multiple dynamic states: high brightness when the trigger is pulled (work mode), low brightness when the trigger is released but timer is active (standby mode), and off when timer expires. This dynamic operation allows the light to adapt to different usage scenarios, providing full illumination when needed while conserving energy during transitions and storage.
Solution Approach 2:
The timer creates periodic illumination cycles where the light remains on for a predetermined period after trigger release. This periodic action ensures the light is available during brief interruptions or when the tool is set down temporarily, while automatically turning off after the timer expires to conserve energy during extended idle periods.
2Illumination intensity
If the light unit illuminates at high brightness always to ensure work area visibility, then the illumination quality is improved, but the battery life decreases
Solution Approach 1:
The light unit dynamically adjusts brightness based on operational state: high brightness during active use when the trigger is pulled, and low brightness during idle periods when the trigger is released. This dynamic brightness adjustment maintains optimal visibility during work while significantly extending battery life during non-productive periods.
Solution Approach 2:
The system changes the illumination parameter (brightness level) based on operational context. The light unit control circuit receives signals from the switch unit to transition between high and low brightness states, optimizing the balance between visibility requirements and energy conservation throughout the tool's operational cycle.
3Loss of energy
If the light turns off immediately when the switch is released to save energy, then the energy conservation is improved, but the user convenience deteriorates
Solution Approach 1:
The timer initiates a preliminary action by keeping the light on for a predetermined period after the trigger is released. This preliminary illumination period anticipates that the user may need to move the tool or reposition it, providing convenient visibility during the transition period before energy conservation takes over and the light turns off.
Solution Approach 2:
The timer acts as an intermediary between the switch unit and the light unit control circuit. It receives the trigger release signal and mediates the light's response by maintaining illumination for a predetermined period rather than turning off immediately, thus bridging the gap between user convenience and energy conservation requirements.
Data Source
AI summary
A power tool including a motor, light unit, and switch unit for selectively connecting the motor and light unit to a power source. A control module includes a controller coupled to a first electronic switch to control power delivery to the motor based on a position of the switch unit, and to a second electronic switch to control power delivery to the light source based on a position of the switch unit. A timer is configured to keep the light unit illuminated for a predetermined amount of time after the switch unit has been activated or deactivated. The control module also includes a boot circuit with a semiconductor switch that continues to deliver power to the controller and to the light unit when the switch unit is deactivated subsequent to being activated, to enable the light unit to remain illuminated after the switch unit has been deactivated.