Nonvolatile Memory for Contactless Power Control
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Solution Overview
Problem
Existing contactless power transmission systems lack a configuration for storing and utilizing status information, such as battery status and temperature abnormality detection, for appropriate charging control, and do not include nonvolatile memory on the power receiving device side for storing this information.
Innovation Solution
A control device on the power receiving device side in a contactless power transmission system includes a nonvolatile memory to store status information like battery status and temperature abnormality detection, allowing for appropriate charging control based on this information, and a load modulation portion to transmit this information to the power transmitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If status information is stored in volatile memory only, then the system structure remains simple, but the charging control reliability deteriorates due to potential data loss during power interruptions
Solution Approach 1:
The nonvolatile memory stores status information in advance before any potential power interruption occurs. This preliminary storage ensures that critical charging data such as battery status, temperature abnormality detection, and charging cycle information are preserved even when power is lost, preventing data loss and ensuring reliable charging control resumption
Solution Approach 2:
The nonvolatile memory acts as an intermediary between the volatile memory and the charging control system. It serves as a backup storage layer that mediates data preservation, allowing the system to maintain reliability by transferring critical status information from volatile to nonvolatile storage when needed, thus resolving the contradiction between simplicity and reliability
2Adaptability or versatility
If no nonvolatile memory is included on the power receiving device side, then the device complexity remains low, but the ability to perform appropriate charging control based on historical status information is lost
Solution Approach 1:
The nonvolatile memory pre-stores status information including battery status, temperature abnormality detection, and charging cycle data before charging operations begin or are interrupted. This advance storage enables the charging control system to adapt to different charging scenarios by retrieving historical data, thereby improving charging control adaptability without requiring complex real-time sensing systems
Solution Approach 2:
The system creates a copy of critical status information in the nonvolatile memory. This copying mechanism allows the charging control to access historical data for decision-making without adding complex real-time monitoring hardware, thus enhancing adaptability while keeping the device structure relatively simple
3Reliability
If temperature abnormality detection information is not stored, then the memory storage requirement remains minimal, but the safety control capability during abnormal conditions deteriorates
Solution Approach 1:
The system extracts and isolates the critical temperature abnormality detection information from other status data and stores it specifically in the nonvolatile memory. This extraction of key safety-related data ensures that temperature monitoring capability is maintained even with minimal storage capacity, thereby improving safety control capability without requiring large memory quantities
Solution Approach 2:
The nonvolatile memory is allocated specifically for storing temperature abnormality detection information and other critical safety data. This localized storage approach concentrates memory resources on safety-critical parameters, enabling reliable safety control while keeping overall memory requirements minimal by not storing unnecessary data
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 effective charging control and power transmission management by storing and utilizing status information, ensuring safe and efficient charging operations, especially during abnormal temperature conditions.
Implementation Method 1
contactless power transmission (wireless power transfer) in which electromagnetic induction is used to make power transmission possible without metal contact
Implementation Method 2
a load modulation portion that transmits communication data to the power transmitting device by load modulation
Data Source
AI summary
A control device on a power receiving side includes a charging portion that charges a battery based on power that is received by a power receiving portion that receives power from a power transmitting device, a control portion 54 that performs charging control, and a nonvolatile memory. The nonvolatile memory stores status information of the battery, and the control portion performs charging control based on the status information stored in the nonvolatile memory.