Harmonic Detection Circuit for Non-Contact Power Coil Alignment
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Solution Overview
Problem
Existing non-contact power transmission systems rely on continuous power transmission to detect coil misalignment, limiting the ability of the power transmitting device to voluntarily acquire coil alignment information and requiring user intervention for correct positioning.
Innovation Solution
A power transmission control device with a harmonic detection circuit that detects harmonic signals of the primary coil's drive signal, allowing the system to voluntarily and accurately determine the relative positional relationship between the primary and secondary coils, and a resonant circuit that resonates with these harmonics to facilitate automatic positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous power transmission is used to detect coil misalignment, then the power receiving device can detect misalignment, but the power transmitting device cannot voluntarily acquire coil alignment information and user intervention is required
Solution Approach 1:
Instead of having the power receiving device detect misalignment through continuous power transmission, the invention inverts the detection approach by having the power transmitting device detect harmonic signals generated by the coupled coils. This allows the transmitting device to voluntarily acquire alignment information without requiring user intervention or continuous power transmission.
Solution Approach 2:
The invention introduces a feedback mechanism where the power transmitting device detects harmonic signals from the coupled coils and uses this information to determine relative positional relationships. This feedback loop enables automatic positioning by continuously monitoring harmonic signal presence and adjusting coil positions accordingly.
2Loss of information
If continuous power transmission is maintained for misalignment detection, then alignment information can be obtained, but energy is continuously consumed
Solution Approach 1:
The invention employs periodic detection of harmonic signals instead of continuous power transmission. The power transmitting device periodically checks for harmonic signals at predetermined frequencies to determine coil alignment, thereby obtaining positional relationship information while significantly reducing energy consumption compared to continuous transmission.
3Reliability
If the power receiving device detects misalignment, then positioning information is available, but the power transmitting device lacks voluntary acquisition capability
Solution Approach 1:
The invention enables the power transmitting device to perform self-service by autonomously detecting harmonic signals and determining relative positional relationships between coils. This self-service capability eliminates the need for user intervention in positioning, improving both automatic positioning convenience and operational reliability.
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 the power transmitting device to automatically detect and adjust the positional relationship between the primary and secondary coils, improving the accuracy and convenience of non-contact power transmission without the need for continuous power transmission or user intervention.
Implementation Method 1
non-contact power transmission (contactless power transmission) that utilizes electromagnetic induction to enable power transmission without metal-to-metal contact
Implementation Method 2
a resonant circuit that resonates with a harmonic of the drive signal of the primary coil
Data Source
AI summary
A power transmission control device used for a non-contact power transmission system includes a power-transmitting-side control circuit that controls power transmission to a power receiving device, and a harmonic detection circuit that detects a harmonic signal of a drive frequency of a primary coil. A resonant circuit (leakage inductance and resonant capacitor) that resonates with the harmonic of the drive frequency of the primary coil L1 is formed in the power receiving device so that harmonic resonance occurs. The harmonic detection circuit detects the harmonic resonance peak of the drive frequency of the primary coil.