Resonance Circuit Frequency Switching for Safe Wireless Charging
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Solution Overview
Problem
Information processing apparatuses equipped with non-contact communication and charging functions face the risk of electrical circuit damage due to high induced voltages during non-contact charging, as existing methods do not effectively isolate the communication and charging frequencies, leading to prolonged exposure that can destroy the communication circuit.
Innovation Solution
The apparatus employs a resonance circuit that changes its frequency from the communication frequency (e.g., 13.56 MHz) to a sub-harmonic frequency (e.g., 6.78 MHz) during charging, using a filter to block the charging frequency and prevent excessive load on the communication circuit, allowing safe non-contact charging while maintaining communication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same antenna is used for both non-contact communication and non-contact charging, then device complexity is reduced, but the communication circuit is damaged due to high induced voltages during charging
Solution Approach 1:
The patent applies frequency switching to dynamically change the operating characteristics of the resonance circuit. During communication mode, the circuit operates at the communication frequency (e.g., 13.56 MHz), and during charging mode, it switches to a sub-harmonic frequency (e.g., 6.78 MHz). This dynamic frequency change allows the same physical antenna to serve both functions while preventing damage to the communication circuit, as the sub-harmonic frequency does not resonate with the communication circuit components.
Solution Approach 2:
The patent changes the operating frequency parameter of the resonance circuit based on the operational mode. By switching between communication frequency and sub-harmonic frequency, the system optimizes performance for each function while avoiding the harmful effects of using the same frequency for both purposes. This parameter change ensures that the communication circuit is not exposed to damaging induced voltages during charging.
2Loss of energy
If non-contact charging is performed using the communication frequency, then power transfer efficiency is improved, but the communication circuit is exposed to excessive load and potential damage
Solution Approach 1:
The patent introduces a sub-harmonic frequency as an intermediary for power transfer during charging operations. Instead of directly using the communication frequency for power transfer, the system uses the sub-harmonic frequency (e.g., 6.78 MHz, which is half of 13.56 MHz) as a mediator. This intermediary frequency enables efficient power transfer to the power receiving unit while avoiding the harmful induced voltages that would occur if the communication frequency were used directly for charging.
3Device complexity
If the resonance circuit operates at a fixed frequency, then circuit design is simplified, but the apparatus cannot perform both communication and charging functions safely
Solution Approach 1:
The patent implements a frequency switching mechanism that allows the resonance circuit to dynamically adapt between communication and charging modes. The system includes frequency switching circuitry that changes the resonant frequency of the circuit based on the operational requirements. This dynamic frequency adjustment enables the apparatus to safely perform both communication and charging functions using a single antenna, rather than requiring separate antennas for each function.
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 solution enables safe non-contact charging by suppressing the load on the communication circuit, preventing damage even during extended charging periods, and allows reliable communication after charging by reverting to the original communication frequency.
Implementation Method 1
changing the resonant frequency of the resonance circuit from the first frequency to the second frequency
Implementation Method 2
a carrier wave with a specific frequency such as 13.56 MHz. Communication is carried out between the reader/writer and the information processing apparatus by having the reader/writer transmit a carrier wave
Implementation Method 3
a power receiving unit to wirelessly receive power from the external apparatus using a second carrier wave of a second frequency
Implementation Method 4
using a filter to block the charging frequency and prevent excessive load on the communication circuit
Data Source
AI summary
A power charging system is provided. The power charging system may have an information processing apparatus having a first communication unit and a power receiving unit, and an external apparatus having a second communication unit and a power transmission unit. The second communication unit may be configured to wirelessly communicate with the first communication unit using a first carrier wave having a first frequency and the power transmission unit may be configured to wirelessly transmit power to the power receiving unit using a second carrier wave having a second frequency, the second frequency being different from the first frequency.