Contactless Power Control via Load Modulation Sequences
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Solution Overview
Problem
Existing contactless power transmission systems require complex authentication processing and sequence management, leading to complicated operation sequences and inadequate power control, particularly during normal power transmission and communication.
Innovation Solution
A control device on the power transmitting side that initiates and maintains normal power transmission based on load modulation from the power receiving device, allowing for simple operation sequences and effective power control through intermittent power transmission for landing detection, full charge detection, abnormality handling, and temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ID authentication processing is performed before normal power transmission, then power transmission safety is improved, but operation sequence complexity increases
Solution Approach 1:
The patent extracts the authentication function from a separate pre-transmission process and integrates it into the load modulation communication framework. The foreign object detection and authentication are performed through load modulation signal analysis during the power transmission setup phase, eliminating the need for separate authentication sequences while maintaining safety.
Solution Approach 2:
The patent combines foreign object detection, authentication, and power transmission control into a unified load modulation-based communication system. By merging these functions into a single integrated process that uses load modulation signals for both communication and detection, the operation sequence is simplified while maintaining comprehensive safety checks.
2Measurement precision
If regular load modulation is performed after normal power transmission, then power control accuracy is improved, but operation sequence complexity increases
Solution Approach 1:
The patent maintains continuous load modulation communication throughout the power transmission process, from initialization to normal operation. This continuous communication enables real-time power control and monitoring without interrupting the power flow, achieving accurate power control while maintaining a simple, uninterrupted operation sequence.
Solution Approach 2:
The patent establishes load modulation communication channels and detection mechanisms before initiating normal power transmission. By preliminarily setting up the communication framework and detection systems, the patent enables accurate real-time power control during transmission without adding complex sequential steps, as the control infrastructure is already in place.
3Measurement precision
If intermittent power transmission is performed for landing detection, then detection accuracy is improved, but power transmission efficiency decreases
Solution Approach 1:
The patent employs periodic intermittent power transmission specifically for landing detection phases, where brief power pulses are used to detect the presence and proper placement of the power receiving device. After successful landing detection, the system transitions to continuous power transmission for efficient charging, thus maintaining high detection accuracy while minimizing efficiency loss to only the brief detection intervals.
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 contactless power transmission and communication with a simplified operation sequence, efficient power control, and power saving by starting and stopping power transmission based on load modulation conditions, ensuring appropriate charging and safety.
Implementation Method 1
contactless power transmission (wireless power transfer) in which electromagnetic induction is used to make power transmission possible without a metal contact
Implementation Method 2
data is communicated from a power receiving side (secondary side) to a power transmitting side (primary side) using load modulation
Data Source
AI summary
A control device, an electronic apparatus, a contactless power transmission system, and the like that can realize contactless power transmission and communication by load modulation with a simple operation sequence. A control device, on a power transmitting side in a contactless power transmission system including a power transmitting device and a power receiving device, includes: a driver control circuit that controls a power transmission driver of a power transmission unit that transmits power to the power receiving device; a control unit that controls the driver control circuit; and a communication unit that preforms communication processing with the power receiving device that transmits communication data by load modulation. The control unit causes the power transmission unit to start normal power transmission on a condition that the power receiving device has started the load modulation, and causes the power transmission unit to continue the normal power transmission while the load modulation continues.