Inductive Charging Coil Load Modulation for Full Charge Detection
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Solution Overview
Problem
Existing non-contact battery charging methods using magnetic induction face inefficiencies due to the complexity and cost of circuitry required to detect full charge and stop power transmission, leading to wasteful power consumption and heat generation.
Innovation Solution
A method of data transmission embedded in electric power transmission, where the receiving coil load is varied to transmit data to the transmitting coil, allowing for simple circuitry and asynchronous data transfer, enabling efficient detection of full charge and optimal power conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuitry is added to detect full-charge on the receiving coil-side and cut-off charging current, then battery overcharging is prevented, but power transmission cannot be stopped and wasteful power consumption occurs
Solution Approach 1:
The patent implements feedback by detecting changes in transmitting coil current that correspond to receiving coil load variations. When the battery reaches full charge, the receiving coil side changes its load, which causes a detectable change in the transmitting coil current. This feedback mechanism allows the transmitting side to detect full-charge condition and stop power transmission, preventing both overcharging and wasteful power consumption.
Solution Approach 2:
The patent makes the transmitting coil current serve multiple functions: it is used both for power transmission and for data communication. By detecting load changes on the receiving side through current variations in the transmitting coil, the system uses the same electromagnetic field for both energy transfer and information exchange, eliminating the need for separate communication circuitry.
2Reliability
If a transmitter and receiver are added to send full-charge data from receiving coil-side to transmitting coil-side, then power transmission can be stopped at full-charge, but circuit structure becomes complex and part cost increases
Solution Approach 1:
The patent merges the power transmission function and data communication function into a single mechanism. The load changes on the receiving coil side, which are necessary for battery charging control, simultaneously serve as data signals that can be detected through transmitting coil current variations. This combining of functions eliminates the need for separate transmitters and receivers.
Solution Approach 2:
The system uses the existing electromagnetic coupling between transmitting and receiving coils to perform dual functions. The load modulation on the receiving side, which is inherent to the charging process, automatically serves as the communication signal. No additional active communication components are needed because the charging process itself generates the data transmission signal.
3Ease of operation
If non-contact power transmission is used to charge batteries continuously, then electrical contacts are eliminated, but power cannot be stopped when batteries are fully charged leading to heat generation
Solution Approach 1:
The patent implements feedback control by continuously monitoring transmitting coil current for load changes indicating full-charge condition. When the battery reaches full charge, the receiving side's load change is detected through current variation in the transmitting coil, triggering automatic shutdown of power transmission. This prevents continuous power transmission and associated heat generation while maintaining contactless charging convenience.
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 approach allows for accurate and efficient data transmission between coils, preventing wasteful power consumption and heat generation by detecting full charge and ensuring ideal power transmission conditions, while maintaining a simple circuit structure.
Implementation Method 1
a non-contact method of transmitting electric power from a transmitting coil to a receiving coil via magnetic induction
Implementation Method 2
a battery pack that houses a receiving coil magnetically coupled with the transmitting coil
Data Source
AI summary
The method of data transmission embedded in electric power transmission disposes a transmitting coil 11 and a receiving coil 31 in close proximity, transmits electric power in a non-contact fashion from the transmitting coil 11 to the receiving coil 31 by magnetic induction, and transmits data from the receiving coil 31 side to the transmitting coil 11 side. The method of data transmission changes the load on the receiving coil 31 and detects transmitting coil 11 current change corresponding to that load variation to send data from the receiving coil 31 side to the transmitting coil 11 side.