Charging Cradle Switch Mechanism Prevents Short-Circuit
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Solution Overview
Problem
Current charging cradles often short-circuit due to conductive device housings coming into contact with charging contacts, leading to improper charging and potential damage.
Innovation Solution
Incorporation of a switch mechanism, such as a pivotally mounted actuator or electro-mechanical switch, that positions the charging contact in a non-charging state unless the rechargeable medium is fully inserted, preventing short-circuiting by decoupling the charging contact when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging contact is always in contact with the housing, then the device can be charged at any time, but the charging circuit may be short-circuited
Solution Approach 1:
The charging contact is made movable rather than fixed, allowing it to dynamically adjust its position between extended (charging mode) and retracted (safe mode) states based on whether a device is properly inserted, thus preventing short-circuits while maintaining charging availability
Solution Approach 2:
The charging contact is extended in advance before device insertion, and the system proactively retracts it when device removal is detected, preventing potential short-circuits before they can occur
2Reliability
If the charging contact is retracted to prevent short-circuiting, then safety is improved, but charging cannot begin until proper insertion is detected
Solution Approach 1:
The charging contact is extended in advance before the device is inserted into the cradle. When the device is properly inserted, the charging contact is already in position to make immediate electrical connection, eliminating any charging delay while still maintaining safety by retracting when the device is removed
3Reliability
If a switch mechanism is added to control charging contact position, then short-circuit prevention is improved, but device complexity increases
Solution Approach 1:
The charging contact's movement is automatically controlled by the presence or absence of the device itself. The device's insertion and removal actions directly trigger the charging contact to extend or retract, eliminating the need for separate switches or complex control mechanisms while still achieving reliable short-circuit prevention
Data Source
Figure 1A~1B
Figure 2
Figure 3A
AI summary
A charging cradle for a rechargeable medium having a charging contact. The charging cradle including a cradling-body, which includes a receiving area shaped to receive the rechargeable medium; a charging circuit having a charging and a non-charging state; a charging contact electrically coupled to the charging circuit and positioned to be alignable with the charging contact of the rechargeable medium; and a switch coupled to the cradling-body for interacting with the rechargeable medium to place the charging circuit in the charging state or the non-charging state. When the rechargeable medium is fully inserted into the receiving area such that the charging contact of the rechargeable medium is aligned with the charging contact of the cradling-body, the rechargeable medium, via the switch, places the charging circuit in the charging state, and when the rechargeable medium is not fully inserted, the switch places the charging circuit in the non-charging state to prevent short-circuiting of the charging circuit.