Power Transmission Apparatus Checking Signal Removal Detection
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Solution Overview
Problem
Existing wireless power transfer systems struggle to detect the removal of a power reception apparatus during a power transmission stop period, leading to delayed detection and potential inefficiencies.
Innovation Solution
A power transmission apparatus equipped with an antenna, a receiving unit, a detection unit, and a control unit that transmits a checking signal during the power transmission stop period to detect the presence or absence of the power reception apparatus based on voltage or current changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power transmission apparatus stops power transmission during the specified power transmission stop period, then energy consumption is reduced and heat generation is minimized, but the detection of power reception apparatus removal is delayed
Solution Approach 1:
The patent implements periodic transmission of checking signals during the power transmission stop period. The control unit transmits checking signals at predetermined intervals to detect removal of the power reception apparatus, while maintaining overall power transmission suspension. This periodic checking mechanism resolves the contradiction by enabling timely detection without requiring continuous full-power transmission, thus balancing energy savings with detection responsiveness.
2Reliability
If the power transmission apparatus continuously transmits power, then the power reception apparatus remains continuously detected, but energy consumption increases and heat generation rises
Solution Approach 1:
The patent maintains continuous detection capability during the power transmission stop period by periodically transmitting checking signals. This ensures that the power transmission apparatus can continuously monitor the presence of the power reception apparatus without requiring continuous full-power transmission, thus maintaining detection reliability while reducing energy consumption.
Solution Approach 2:
The control unit transmits checking signals at predetermined intervals during the power transmission stop period, enabling continuous monitoring of the power reception apparatus presence without sustained high energy consumption. This periodic checking maintains detection reliability while achieving energy efficiency.
3Measurement precision
If the power transmission apparatus transmits checking signals during the power transmission stop period, then removal detection is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the existing antenna and signal transmission capabilities for dual purposes: normal power transmission and removal detection via checking signals. The same hardware components are used for both functions, avoiding additional complex detection equipment. The control unit integrates both power transmission control and checking signal transmission logic, managing increased functional complexity through unified control.
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 transmission apparatus to quickly detect the removal of the power reception apparatus even during the power transmission stop period, allowing for timely adjustments and improving system efficiency.
Implementation Method 1
an antenna configured to wirelessly transmit power to a power reception apparatus
Implementation Method 2
a detection unit configured to detect at least one of a voltage or a current applied to the antenna
Data Source
AI summary
When a communication unit receives an end power transfer (EPT) packet including information about a power transmission stop period from a power reception apparatus, a power transmission apparatus controls a power transmission coil to transmit a checking signal for checking existence of the power reception apparatus during the power transmission stop period, detects at least one of a voltage or a current applied to the power transmission coil when the checking signal is transmitted, and determines whether the power reception apparatus that has transmitted the EPT packet exists, based on the detection result.