Induction Coil Phase Sensing for External Device Detection
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Solution Overview
Problem
Induction devices lack the ability to efficiently identify and adapt to different external devices for wireless power transmission, requiring separate settings for various appliances like toasters, blenders, and kettles, which complicates the process of determining the required wireless reception power.
Innovation Solution
Incorporating a wireless power transmission circuit, a current sensor, and a processor that outputs a detection power to measure current phases and identify phase delay values to determine the proximity and type of external devices, allowing for tailored wireless power transmission based on the identified device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the induction device uses electromagnetic induction for heating, then thermal efficiency and heating speed are improved, but the device cannot efficiently identify and adapt to different external devices for wireless power transmission
Solution Approach 1:
The system automatically detects external devices and configures wireless power transmission parameters without user intervention. The processor identifies device types through electromagnetic interaction and autonomously adjusts transmission settings, making the system self-configuring rather than requiring manual setup.
Solution Approach 2:
The system dynamically changes electromagnetic parameters (frequency, power level, phase) based on detected external device characteristics. By adjusting these parameters in real-time, the system adapts to different device types and requirements without physical reconfiguration.
2Measurement precision
If the induction device outputs detection power to measure current phases, then external device identification accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs phase detection periodically rather than continuously, outputting detection power only when needed to identify or re-identify external devices. This intermittent operation significantly reduces energy consumption while maintaining accurate device identification capability.
Solution Approach 2:
The system applies detection power at elevated levels only momentarily during the detection phase to obtain precise phase measurements, then reduces power to minimal levels during normal operation. This partial application of excessive power during critical measurement moments achieves high precision without sustained high energy consumption.
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 easier identification of external devices and optimized wireless power transmission, ensuring that each device receives the appropriate power level, enhancing operational efficiency and convenience.
Implementation Method 1
The induction device may operate in electromagnetic induction in which a magnetic field is generated in a coil by applying high-frequency alternating current to the coil
Implementation Method 2
identifying a first phase of a first current by measuring the first current flowing through a transmission coil of the wireless power transmission circuitry using the current sensor
Data Source
AI summary
An induction device includes: a wireless power transmission circuit; a current sensor; and at least one processor connected to the wireless power transmission circuit and the current sensor, wherein the at least one processor is configured to output first power for detecting of an external device through the wireless power transmission circuit, identify a first phase of a first current by measuring the first current flowing through a transmission coil of the wireless power transmission circuit using the current sensor while outputting the first power, in a first state where the external device is not in proximity, identify a phase delay value between the first phase of the first current and a second phase of a second current, and identify a second state where the external device is in proximity when the identified phase delay value is equal to or greater than a designated threshold.