Mobile Robot Charging Interface With Arc-Safe Contact Verification
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Solution Overview
Problem
Existing mobile robot charging systems face safety hazards due to electrical arcing and premature electrical flow, and lack effective safety features to prevent damage from improper connections or foreign objects, which can lead to fires and other safety issues.
Innovation Solution
The proposed solution involves a charging interface with a shroud that moves from a closed to an open position to expose electrical contacts, a momentary switch, and magnetic reed switches, which are activated only when the mobile robot is properly connected, ensuring safe electrical contact and preventing charging unless all safety checks are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical contacts are exposed for charging, then charging efficiency is improved, but safety hazards such as electrical arcing and fires increase
Solution Approach 1:
The system performs preliminary safety verification through multiple checks (reed switches detecting magnetic field, momentary switch detecting mechanical engagement, electrical handshake verifying electrical connection) before enabling charging current. This ensures that all safety conditions are met before electrical contacts become active, preventing electrical arcing and fires while maintaining charging efficiency.
Solution Approach 2:
The patent introduces intermediary safety mechanisms between the electrical contacts and the charging current. These include reed switches that detect magnetic fields from magnets on the robot, momentary switches that detect mechanical engagement, and electrical handshake protocols. These intermediaries verify proper connection and orientation before allowing charging, thereby preventing harmful electrical arcing while maintaining efficient charging when conditions are met.
2Reliability
If safety verification mechanisms are added, then safety is improved, but device complexity increases
Solution Approach 1:
The charging interface integrates multiple safety verification functions into a single unified mechanism. The reed switches, momentary switch, and electrical handshake protocol work together as a coordinated safety system rather than separate independent mechanisms. This multi-functional approach enhances safety while minimizing the increase in device complexity by having components serve multiple purposes (e.g., the reed switches both detect magnetic field and verify robot presence and orientation).
Solution Approach 2:
The patent combines multiple safety verification steps into an integrated charging interface. The mechanical engagement (momentary switch), magnetic field detection (reed switches), and electrical connection verification (handshake protocol) are merged into a single coordinated safety verification process. This integration ensures that all safety checks must pass before charging begins, improving reliability while managing device complexity through consolidation rather than multiplication of separate systems.
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
This solution enables safe charging of mobile robots by verifying proper connection and orientation, preventing electrical arcing and fires, and ensuring that charging only occurs when the robot is correctly engaged with the charger, thereby enhancing safety and reducing hazards.
Implementation Method 1
a magnetic field produced by a magnet on the mobile robot turns on one or more reed switches on the charger
Implementation Method 2
The shroud is biased toward the closed position
Implementation Method 3
the momentary switch is biased toward the off position
Data Source
AI summary
A power station can have a power supply and a connector that has at least one power contact for outputting power from the power supply to charge a battery pack, a first auxiliary contact for delivering current to a load, and a second auxiliary contact for receiving a voltage signal. A current sensor can measure the current delivered via the first auxiliary contact, A controller can be configured to determine, based at least in part on the measured current and the received voltage signal, whether the load is a) a battery pack inside a mobile robot that is electrically coupled to a charger, which is coupled to the power station via the connector; or b) a battery pack coupled directly to the power station via the connector.