Battery Protective Element Validation via Handshake Signals
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Solution Overview
Problem
Cordless tools face reduced efficacy in cold temperatures due to high surge currents and voltage drops, which can cause shutdowns and damage from malfunctioning protective elements in the power source.
Innovation Solution
A method and system where a power source, such as a battery, communicates with a switch using handshake signals to adjust power distribution based on temperature, allowing for selective discharge of power at varying rates and validating protective elements to ensure proper functioning, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protective elements are used in the power source to prevent electrical damage, then reliability is improved, but false shutdowns occur in cold temperatures due to malfunctioning protective elements
Solution Approach 1:
The system performs preliminary validation of protective elements through handshake signals before allowing normal operation. This preliminary check ensures protective elements are functioning correctly, preventing false shutdowns while maintaining protection against electrical damage.
Solution Approach 2:
The system uses feedback from handshake signals between the power source and tool to monitor the status of protective elements. This feedback mechanism allows the system to adjust operation based on the functional state of protective elements, preventing false shutdowns while maintaining reliability.
2Productivity
If power is discharged at high rate to maintain tool performance, then productivity is improved, but temperature-related damage occurs in cold environments
Solution Approach 1:
The system dynamically adjusts power discharge rates based on temperature conditions and validation results. In cold temperatures, the system modifies the discharge rate to prevent damage while maintaining adequate tool performance, creating a dynamic balance between productivity and protection.
Solution Approach 2:
The system changes operational parameters such as discharge current and voltage based on temperature conditions. By adjusting these parameters dynamically, the system prevents temperature-related damage while maintaining sufficient power output for tool operation.
3Reliability
If handshake signal validation is implemented for protective elements, then reliability is improved, but device complexity increases
Solution Approach 1:
The handshake signal mechanism serves multiple functions: it validates protective elements, communicates temperature conditions, and controls power discharge rates. This multi-functionality reduces the need for separate validation circuits, thereby limiting the increase in device complexity while improving reliability.
Data Source
AI summary
A method, system and device for discharging power or validating protective elements of a power source to ensure proper functioning of a tool at various temperatures. The power source communicates with a switch using handshake signals to establish a scheme for power distribution depending on the temperature of the power source. The power source can discharge power at a normal start-up rate or a slower start-up rate depending on the temperature of the power source. Handshake signals can also be used to validate protective elements, where the protective elements respond to wake-up signals with respective handshake signals indicating that the protective elements are functioning property.