Non-contact Power Supply System Using Single Coil for Data and Energy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-contact power supply systems require separate coils for communication and power transmission, which increases complexity and costs.
Innovation Solution
A non-contact power supply system that encodes information in the current value or output time of the power transmission coil, allowing information to be transmitted between the power transmission and reception sides without a dedicated communication coil, using the power transmission coil for power transfer and the power reception coil for receiving power and decoding the information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate coils are provided for communication and power transmission, then reliable communication can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the communication function and power transmission function into a single coil system. The power transmission coil serves dual purposes: transmitting power via electromagnetic induction and communicating information by modulating the current (either current value or output timing). This eliminates the need for separate communication coils while maintaining both functions.
Solution Approach 2:
The power transmission coil is designed to perform multiple functions simultaneously. It acts as both the power transmission medium through electromagnetic induction and the communication medium by encoding information in the current characteristics. This multi-functionality reduces the overall number of components needed in the system.
2Loss of information
If separate coils are provided for communication and power transmission, then dedicated communication channels are available, but manufacturing cost increases
Solution Approach 1:
The patent merges the communication coil and power transmission coil into a single integrated system. By encoding communication information in the current characteristics of the power transmission coil, the system eliminates redundant components, thereby reducing manufacturing costs while preserving information transmission capability.
Solution Approach 2:
The power transmission coil is designed with universal functionality to handle both power delivery and data communication. This reduces the total component count and simplifies the manufacturing process, leading to lower production costs without sacrificing communication effectiveness.
3Device complexity
If power transmission coil current is used for communication encoding, then component quantity is reduced, but power transmission efficiency may be affected
Solution Approach 1:
The patent applies partial modulation to the power transmission coil current. Instead of fully modulating the current for communication, only specific parameters (current value or output timing) are partially adjusted to encode information. This minimal modulation approach preserves most of the power transmission efficiency while still achieving reliable communication.
Solution Approach 2:
The patent changes specific parameters of the power transmission coil current (either current magnitude or output timing) to encode communication information. By selectively modifying only the necessary parameters rather than the entire current waveform, the system maintains high power transmission efficiency while enabling effective data transmission.
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 information transmission between the power transmission and reception sides without the need for a separate communication coil, simplifying the system and reducing costs while maintaining efficient power transfer.
Implementation Method 1
A power transmission side coil is disposed in the vicinity of a power reception side coil and a power reception side coil is disposed in the vicinity of the power supply side coil, which are opposedly positioned with an air gap of about only a few cm, upon the power supply. The transmission side coil is made of a two-phase winding coil with axes that are 90 degrees offset; a two-phase carrier AC with phases that are shifted 90 degrees is applied thereto, generating a rotating magnetic field
Implementation Method 2
The reception side coil is made of a single phase coil or a two-phase winding coil; an electromagnetic wave enters therein based on the mutual induction effect of electromagnetic induction to induce a modulation signal
Data Source
AI summary
A non-contact power supply system has a conversion circuit that converts power of a power transmission-side power supply, and outputs power to a power transmission coil. A power transmission-side controller controls the conversion circuit. A power reception coil receives power from the power transmission coil in a non-contact manner. The power reception coil supplies power to a load electrically connected to the power reception coil. A smoothing circuit smooths power received by the power reception coil. A sensor detects current or voltage in the smoothing circuit. A power reception-side controller acquires an encoded value from a detection value of the sensor. The power transmission-side controller measures an elapsed time between a previous rise and a current rise in a detection voltage that is detected by the sensor, and compares the elapsed time and an elapsed time threshold that is set in advance to acquire the encoded value.