Wireless Power Receiving Device Sleep State Resumption
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Solution Overview
Problem
In wireless power transfer systems, the power receiving device experiences wasteful power consumption when waiting in an operating state during power transmission stoppages due to abnormalities in the power transmitting device, risking auxiliary battery rundown.
Innovation Solution
The power receiving device transitions to a sleep state upon power transmission stoppage and sends a request to resume power transmission after a predetermined time, allowing the power transmitting device to resume power transfer without waiting for abnormality resolution, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power receiving device waits in an operating state for power transmission resumption, then power transmission can be quickly resumed, but power consumption of the power receiving device increases
Solution Approach 1:
The power receiving device performs preliminary actions by transitioning to sleep state during power transmission stoppage, and automatically sends a resumption request after a predetermined time elapses. This preliminary preparation allows quick resumption without continuous monitoring, resolving the contradiction between fast resumption and low power consumption.
Solution Approach 2:
Instead of continuous monitoring in operating state, the power receiving device uses periodic action by transitioning to sleep state and automatically waking up after a predetermined time to send resumption request. This periodic check reduces power consumption while ensuring timely resumption.
2Reliability
If the power receiving device waits in an operating state during power transmission stoppage, then power transmission can be quickly resumed, but the auxiliary battery may run down
Solution Approach 1:
The power receiving device performs preliminary action by automatically transitioning to sleep state and setting a timer for predetermined time. When the timer expires, it automatically sends resumption request without needing to continuously monitor, thus preserving battery charge while ensuring reliable resumption.
Solution Approach 2:
The power receiving device serves itself by automatically managing the transition to sleep state, timing the wait period, and sending the resumption request without continuous human intervention or high-power monitoring, thus conserving battery charge while maintaining system reliability.
Data Source
AI summary
A wireless power transfer system includes a power transmitting device and a power receiving device. When an abnormality occurs in the power transmitting device during power transmission to the power receiving device, the power transmitting devise stops power transmission. When power transmission is stopped, the power receiving device transitions to a sleep state which requires less power consumption than an operating state. When a first sleep time has elapsed since the transition to the sleep state, the power receiving device automatically starts up and sends the power transmitting device a request for resuming power transmission. When power transmission is stopped due to an abnormality in the power transmitting device, the power transmitting device resumes power transmission in response to receiving from the power receiving device a request for resuming power transmission as a trigger.