Wireless Power Reception Clock Signal Extraction Circuit
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Solution Overview
Problem
In contactless power transmission systems, achieving synchronization between the power transmission and reception sides is challenging due to the use of different clock signals, leading to difficulties in data communication and detection accuracy.
Innovation Solution
A power reception device with a clock-signal extraction circuit to extract the clock signal from the induced voltage and a demodulation circuit to generate pulses synchronized with the clock signal, eliminating the need for an oscillation circuit and improving data detection accuracy by providing synchronization between the power transmission and reception sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an oscillation circuit is used to generate a clock signal at the power reception side that is different from the clock signal at the power transmission side, then the power reception device can operate independently, but synchronization between the power transmission and reception sides cannot be established, leading to poor data detection accuracy
Solution Approach 1:
The invention extracts the clock signal directly from the induced voltage at the power reception side, removing the need for a separate oscillation circuit. This extracted clock signal is then used to drive the counter, ensuring that the counting operation is synchronized with the power transmission side's clock signal, thereby resolving the contradiction between independent operation and synchronization accuracy
Solution Approach 2:
The induced voltage serves multiple functions: it provides power to the rectification circuit and simultaneously contains the clock signal information needed for data detection. By utilizing the clock signal within the induced voltage for both power timing and data counting, the system achieves synchronization without requiring a separate clock generation mechanism, thus maintaining independence while improving detection accuracy
2Ease of operation
If the counter is driven by a clock signal different from the power transmission side clock signal, then the power reception device can function autonomously, but the timing at the power transmission side and reception side do not conform, making data communication difficult
Solution Approach 1:
The power reception device generates its own clock signal by extracting it from the induced voltage itself, rather than relying on an external or separate oscillation circuit. This self-generated clock signal ensures that the counter operation is inherently synchronized with the power transmission side, maintaining autonomous operation while ensuring reliable data communication through timing conformity
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
The solution enhances data detection accuracy and synchronization, allowing proper demodulation of binary data signals based on the extracted clock signal, ensuring timely data communication between the power transmission and reception sides.
Implementation Method 1
a contactless power transmission method (also referred to as wireless power transmission method) which enables power transmission without a contact of a metal portion by utilizing electromagnetic induction
Data Source
AI summary
A power reception device in a power transmission system including a power transmission device including a primary coil and the power reception device including a secondary coil, the power transmission device being configured to drive the primary coil and transmit AC power corresponding to a clock signal which is frequency-modulated according to a binary data signal, the primary coil and the secondary coil being electromagnetically coupled together to receive by the secondary coil in the power reception device, the AC power transmitted from the power transmission device, comprises a clock-signal extraction circuit configured to extract the clock signal from an induced voltage induced at one end of the secondary coil in receiving the AC power; and a demodulation circuit configured to generate a pulse synchronously with the clock signal extracted by the clock-signal extraction circuit, and demodulate the pulse to obtain the binary data signal.