Non-contact Power Receiving Device Positional Deviation Detection

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Solution Overview

Problem

Non-contact power receiving devices face challenges in detecting positional deviations during precharging, leading to inefficiencies and potential overcurrent issues, which can result in prolonged power transmission stoppages.

Innovation Solution

The non-contact power receiving device temporarily increases its load by connecting a confirmation resistor or other configurations to the power receiving circuit, mimicking the load of normal charging, allowing the power transmission device to detect positional deviations and prevent overcurrent through the overcurrent protection function.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the non-contact power receiving device performs precharging with a small current to suppress damage to the secondary battery, then the transmission power remains below the rated output threshold, but the positional deviation cannot be detected and the overcurrent protection function is not activated

Engineering Contradiction:

Improvesecondary battery protectionVSAvoidpositional deviation detection

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system performs a preliminary detection action by temporarily increasing the load during precharging to generate sufficient transmission power for positional deviation detection. This preliminary action allows the overcurrent protection function to detect positional deviations before switching to normal charging, preventing the harmful effect of undetected positional deviations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system periodically increases the load connected to the power receiving circuit during precharging to enable positional deviation detection. This periodic action alternates between normal precharging operation and detection mode, allowing the system to maintain battery protection while periodically checking for positional deviations.

Inventive Principle:

Principle #19Periodic action

2Productivity

If the non-contact power receiving device switches from precharging to normal charging when the secondary battery reaches a predetermined voltage, then charging efficiency improves, but transmission power may exceed the rated output causing unnecessary power transmission stoppages

Engineering Contradiction:

Improvecharging speedVSAvoidpower transmission stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system uses feedback from the overcurrent protection function to detect positional deviations during precharging. When a positional deviation is detected, the system prevents switching to normal charging, providing feedback control that maintains power transmission stability while still allowing efficient charging when conditions are appropriate.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary positional deviation detection during precharging before switching to normal charging. This preliminary check ensures that the system only transitions to high-power normal charging when properly aligned, preventing unnecessary power transmission stoppages while maintaining charging efficiency.

Inventive Principle:

Principle #10Preliminary action

3Power

If the non-contact power transmission device increases transmission power to compensate for positional deviation, then the reception power remains sufficient, but the transmission power exceeds the rated output and triggers the overcurrent protection function

Engineering Contradiction:

Improvereception powerVSAvoidpower control complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The system performs preliminary detection of positional deviations during precharging by temporarily increasing the load. This preliminary detection allows the system to identify alignment issues before they cause problems during normal charging, simplifying power control by preventing the need for complex real-time power adjustment during charging operations.

Inventive Principle:

Principle #10Preliminary action

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 approach enables the power transmission device to quickly detect positional deviations during precharging, preventing overcurrent and ensuring timely power transmission stoppages, thus improving the accuracy of overcurrent protection and maintaining efficient charging operations.

Implementation Method 1

The non-contact power transmission device supplies power to the non-contact power receiving device in a state of being electromagnetically coupled with the non-contact power receiving device by an electromagnetic induction, a magnetic field resonance

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

Methodology Applied

Scientific EffectMagnetic field resonance: Resonance

Data Source

PatentUS10848000B2Non-contact power receiving device and non-contact power receiving method

Publication Date: 2020.11.24 TOSHIBA TEC KK

AI summary

A non-contact power receiving device is described which receives power from a non-contact power transmission device that transmits power using a power transmission coil, includes a power receiving coil, a power receiving circuit, and a power receiving control circuit. The power receiving coil is electromagnetically coupled to the power transmission coil. The power receiving circuit rectifies power that is generated in the power receiving coil. The power receiving control circuit temporarily increases a load that is connected to the power receiving circuit.