Wireless Charging Control for Over-Discharged Battery Packs
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Solution Overview
Problem
Wireless power transmission systems face challenges when the battery pack is over-discharged, as the receiver cannot establish an auxiliary power supply, preventing normal wireless power transmission and communication between the transmitter and receiver.
Innovation Solution
A control method for a wireless charging system that wirelessly transmits a first preset power to the receiver to establish communication, followed by a first charge signal to initiate charging at a low current, and transitions to a second charge signal at a higher current once the battery pack recovers to a normal state, ensuring continuous charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack is over-discharged and cannot provide auxiliary power, then the receiver control module and wireless communication module cannot work, but the system still needs to establish wireless communication and start power transmission
Solution Approach 1:
The transmitter provides preliminary auxiliary power transmission before normal communication-based charging can occur. When the battery is over-discharged and cannot support receiver operation, the transmitter preemptively supplies power through the power transmitting module to enable the receiver control module and wireless communication module to become operational, thereby resolving the contradiction between system reliability and operation availability.
2Power
If the battery pack is over-discharged, then the receiver loses the capacity to provide auxiliary power supply, but wireless power transmission still needs to be initiated
Solution Approach 1:
The transmitter acts as an intermediary by providing auxiliary power through the power transmitting module when the battery pack cannot provide auxiliary power itself. This intermediary power supply enables the receiver to regain operational capacity, allowing normal wireless power transmission to proceed, thus resolving the contradiction between power transmission capability and auxiliary power supply capacity.
3Power
If the wireless communication module cannot establish communication due to over-discharged battery, then power transmission cannot start, but the system needs to deliver energy to the receiver
Solution Approach 1:
The system performs preliminary power transmission through the power transmitting module before communication can be established. By preemptively delivering auxiliary power when the battery is over-discharged, the receiver control module and wireless communication module become operational, enabling subsequent communication-based power transmission and resolving the contradiction between energy delivery capability and communication capability.
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 the establishment of an auxiliary power supply for the receiver, facilitating normal wireless power transmission and charging even when the battery pack is over-discharged, ensuring continuous energy delivery to the battery pack.
Implementation Method 1
the power transmitting module to wirelessly transmit a first preset power to the power receiving module
Implementation Method 2
the power receiving module to charge the battery pack
Data Source
AI summary
The present disclosure provides a wireless charging system and a control method thereof. The control method includes: when the battery pack is in over-discharged state, controlling the power transmitting module to wirelessly transmit first preset power, i.e., auxiliary electrical energy, to the power receiving module; when the power receiving module receives auxiliary electrical energy, controlling the transmitter wireless communication module to establish wireless communication with the receiver wireless communication module; after wireless communication is established, controlling the power transmitting module to wirelessly transmit first charge signal to the power receiving module enabling the power receiving module charges the battery pack at a first preset current; and after the battery pack recovers to normal charging state, controlling the power transmitting module to wirelessly transmit second charge signal to the power receiving module enabling the power receiving module charges the battery pack at a second preset current.