Multi-Stage Power Adapter Safety and Power Delivery
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Solution Overview
Problem
Developers of mobile computing devices face challenges in ensuring that adapters designed for small form power connections are safe and supply the proper amount of power, as traditional adapters may be dangerous due to constant power levels and susceptibility to shorting out from unintended contacts.
Innovation Solution
A multi-stage power adapter that selectively switches between a low power supply and a high power supply, using a low power mode initially to ensure safety and switch to high power only when the host device is ready, enabling normal operation while preventing damage from unintended contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional adapter supplies constant power levels, then the device can operate normally, but the adapter becomes dangerous due to susceptibility to shorting out from unintended contacts
Solution Approach 1:
The power adapter dynamically adjusts its output power level based on operational stage and host device readiness. It transitions from a low power level during initial connection to a high power level after host confirmation, making the power supply adaptive rather than static. This resolves the contradiction by maintaining safety during vulnerable connection phases while enabling full functionality when safe.
Solution Approach 2:
The adapter performs a preliminary low power supply phase before transitioning to high power. During this initial stage, the adapter supplies only enough power for basic detection and communication, establishing a safe operational baseline before full power is applied. This preliminary action prevents short circuit risks while preparing the system for normal operation.
2Reliability
If the adapter supplies low power initially, then safety is ensured, but the device cannot receive full power until ready
Solution Approach 1:
The system implements a feedback mechanism where the host device communicates its readiness status to the power adapter. The adapter monitors for a confirmation signal from the host before transitioning from low to high power mode. This feedback loop ensures that full power is only delivered when the host device is prepared, resolving the contradiction between safety and productivity.
Solution Approach 2:
The power adapter operates in distinct periodic stages: an initial low power phase for safety and detection, followed by a transition phase upon receiving host confirmation, and finally a high power phase for full operation. This periodic structure allows the system to balance safety requirements with productivity needs at different operational moments.
3Weight of moving object
If the adapter uses small form factor power connections, then portability is improved, but the adapter becomes more susceptible to unintended contacts and shorting
Solution Approach 1:
The adapter's power output dynamically responds to connection status and host readiness. During the vulnerable initial connection phase with small form factor connectors, the adapter maintains low power output, automatically reducing risk when physical contacts are more exposed. This dynamic adjustment compensates for the increased vulnerability of compact connectors.
Solution Approach 2:
The adapter implements a protective low power mode that acts as a cushion against potential short circuit damage. Before full power is applied, this preliminary low power state provides a safety buffer that minimizes harm from unintended contacts, which are more likely with small form factor connections that are easier to accidentally touch or short.
Data Source
AI summary
Multi-stage power adapter techniques are described in which a power adapter for a device is configured to selectively switch between a relatively low power supply and a relatively high power supply. The low power supply may be employed upon initial connection of the adapter to a host device to ensure that the adapter is safe when disconnected and does not supply full power before the device is ready to receive the high power supply. The low power supply may supply enough power for the host device to detect the connection of the adapter and establish initial communication with the adapter. A switch to the high power supply by the adapter may then occur in response to a notification from the host device that indicates the host device is ready for the high power supply. The switch to high power supply enables normal operation of the host device.