Non-Contact Power Transmission Current Detection Authentication
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Solution Overview
Problem
Existing non-contact power transmitting devices face challenges in detecting induced voltage at high frequencies, making authentication and demodulation difficult, especially when the power transmitting device is separated by several centimeters from the power receiving device.
Innovation Solution
A non-contact power transmitting device with a power transmitting device that includes a detection unit to detect current supplied to the power transmitting circuit and a determination circuit to compare the detected current with a threshold, allowing for efficient power transmission and authentication using a simple circuit configuration, even at high frequencies such as several megahertz, through magnetic field resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic induction method is used at approximately 100 kHz for power transmission, then power transmission efficiency is maintained when devices are in close contact, but it becomes difficult to detect induced voltage and perform demodulation at high frequencies of several megahertz when devices are separated by several centimeters
Solution Approach 1:
The patent changes the detection parameter from induced voltage to current supplied to the power transmitting circuit. By detecting current instead of voltage, the system can operate at high frequencies of several megahertz while maintaining reliable detection capability even when devices are separated by several centimeters, resolving the contradiction between transmission efficiency and detection difficulty.
2Length of moving object
If power transmission frequency is increased to several megahertz for magnetic field resonance, then power can be transmitted over several centimeters separation distance, but induced voltage detection and authentication become difficult
Solution Approach 1:
The patent changes the detection parameter from induced voltage to current supplied to the power transmitting circuit. This parameter substitution enables reliable detection at high frequencies of several megahertz, allowing power transmission over separation distances of several centimeters while maintaining authentication capability.
Solution Approach 2:
The patent substitutes the electrical measurement method (voltage detection) with a different physical measurement approach (current detection). This substitution allows the system to overcome the limitations of voltage detection at high frequencies and achieve reliable operation at several megahertz with centimeter-level separation.
3Device complexity
If simple circuit configuration is used for authentication, then device complexity is reduced, but ability to perform authentication and demodulation at high frequencies is compromised
Solution Approach 1:
The patent changes the detection parameter from induced voltage to current supplied to the power transmitting circuit. This simple parameter substitution maintains circuit configuration simplicity while enabling reliable authentication and demodulation at high frequencies of several megahertz, resolving the contradiction between simplicity and 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 easy authentication between power transmitting and receiving devices at high power transmission frequencies, preventing incorrect power transmission to unspecified apparatus and reducing power wastage, while maintaining efficient power transfer.
Implementation Method 1
The power transmitting device transmits power to the power receiving device in a non-contact manner through electromagnetic coupling, such as electromagnetic induction or magnetic resonance
Implementation Method 2
efficient power transmission and authentication using a simple circuit configuration, even at high frequencies such as several megahertz, through magnetic field resonance
Implementation Method 3
a detection unit to detect current supplied to the power transmitting circuit
Data Source
AI summary
A non-contact power transmitting device includes a power receiving device that includes a rectification circuit, a voltage converting circuit, and a switching circuit for connecting or disconnecting the voltage converting circuit to or from a load circuit, and a power transmitting device that includes a power transmitting circuit, a detection circuit that detects a current that is supplied to the power transmitting circuit, and a determination circuit that compares the detected current value with a threshold current set in advance, and determines whether the load circuit of the power receiving device is in contact with the power transmitting device, where the power transmitting device transmits power to the power receiving device in a non-contact manner.