Wireless Power Receiver Control for Low-Complexity Command Detection
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Solution Overview
Problem
Existing contactless power transmission systems require complex circuits in power receiving devices to analyze received signals, leading to increased manufacturing costs and circuit scale.
Innovation Solution
A control device in the power receiving device specifies issued commands based on the length of reception periods of signals with different frequencies or duties, allowing accurate command identification without increasing circuit complexity, using a control portion that measures reception periods and adjusts power transmission frequencies or duties to notify the power receiving device of various commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data is transmitted using packets or bits that require signal analysis, then data communication capability is improved, but circuit scale and manufacturing cost increase
Solution Approach 1:
The patent transmits command information by changing physical parameters of the power transmission signal itself (frequency, duty cycle) rather than modulating separate data packets. Different commands are represented by different frequency shifts or duty cycle ratios, allowing the power receiving device to identify commands through simple parameter detection rather than complex signal analysis, thus reducing circuit scale while maintaining communication capability
Solution Approach 2:
The power transmission signal serves dual functions: both power transfer and command communication. By encoding command information directly into the power signal's physical characteristics (frequency, duty cycle), the system eliminates the need for separate communication circuits, reducing overall device complexity while maintaining versatile communication capability
2Measurement precision
If signal analysis circuits are added to specify command content, then command identification accuracy is improved, but manufacturing cost increases
Solution Approach 1:
Command information is encoded as distinct physical parameters (frequency values, duty cycle ratios) that can be detected using simple comparison circuits. The control portion measures the frequency shift or duty cycle ratio and compares it against predetermined thresholds to identify commands, achieving accurate command specification without requiring complex analysis circuits, thereby keeping manufacturing costs low
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 accurate specification of commands, such as normal or quick charging, while maintaining a reduced circuit scale and manufacturing cost, and allows for secure power supply operations, including turning off power supply effectively.
Implementation Method 1
contactless power transmission (wireless power transfer) in which electromagnetic induction is used to make power transmission possible without a metal contact
Data Source
AI summary
A control device includes a control portion that controls a power supply portion that supplies power to a load based on received power received by a power receiving portion from a power transmitting device. In the case where the power receiving portion, after receiving a signal having a first frequency and a first duty from the power transmitting device, receives a signal having a second frequency that is different from the first frequency or a signal having a second duty that is different from the first duty, the control portion specifies an issued command based on a length of a reception period of the signal having the second frequency or the signal having the second duty.