Inductive Charging Device Battery Removal Detection
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Solution Overview
Problem
Existing inductive charging devices for portable power tool batteries lack efficient detection mechanisms for battery removal during charging, leading to potential stress on the charging unit and reduced lifespan.
Innovation Solution
Incorporating a detector unit with sensors to monitor resonance voltage and current, allowing for immediate interruption of energy transmission when deviations or steady increases are detected, thereby preventing excessive stress on the charging unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detector unit with sensors monitoring resonance voltage and current is incorporated, then the detection reliability and speed of battery removal is improved, but the device complexity increases
Solution Approach 1:
The sensor serves multiple functions: it monitors both resonance voltage and resonance current, and these measurements are used for both detection and interruption decisions. This multi-functionality improves reliability without proportionally increasing complexity.
Solution Approach 2:
The system uses its own operational parameters (resonance voltage and current) for self-monitoring and self-protection. The charging unit's inherent resonance characteristics are exploited for detection, eliminating the need for separate dedicated detection hardware.
2Duration of action of stationary object
If immediate interruption of energy transmission is implemented upon detecting deviations, then the charging unit lifespan is extended by reducing stress, but the response time requirement increases system complexity
Solution Approach 1:
The system establishes limit values for resonance voltage and current before operation begins. These pre-set thresholds enable immediate interruption decisions without complex real-time analysis, extending lifespan while maintaining simple control logic.
Solution Approach 2:
The sensor continuously monitors resonance parameters and feeds this information back to the detector unit, which immediately triggers interruption when limit values are exceeded. This closed-loop feedback system ensures rapid response with minimal complexity.
3Speed
If continuous monitoring of resonance voltage and current is performed, then the detection speed of battery removal is improved, but the energy consumption increases
Solution Approach 1:
The sensor continuously monitors resonance voltage and current during the charging process, enabling immediate detection of battery removal. The monitoring is integrated into the existing charging operation, so the energy consumed is part of the necessary charging process rather than additional overhead.
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 reliable, fast detection of battery removal and immediate interruption of energy transfer, extending the lifespan of the charging unit by minimizing stress during battery removal.
Implementation Method 1
the sensor (18) is provided for monitoring a resonance voltage and/or a resonance current of the charging unit (14)
Implementation Method 2
transforming an electrical energy provided by a power source, in particular by an energy supply network, and transferring the electrical energy wirelessly, preferably inductive, to at least one receiver
Implementation Method 3
the charging unit comprises at least one resonance circuit, which comprises at least one coil, which is in particular provided for generating an alternating magnetic field
Data Source
AI summary
The invention relates to an inductive charging device for charging at least one battery, in particular at least one portable power tool battery, with a charging unit provided for transferring electrical energy to the at least one battery, and with a detector unit provided for detecting a removal of the at least one battery during a charging process. It is proposed that the detector unit includes at least one sensor provided for monitoring at least a resonance voltage and/or at least a resonance current of the charging unit.