Contactless Power Feeding Apparatus Rush Current Control
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Solution Overview
Problem
Existing power feeding systems face challenges in reducing rush currents during device startup or charging, which can lead to increased costs and apparatus size due to the need for additional protection circuits and components.
Innovation Solution
A contactless power feeding system using magnetic coupling, where a power feeding apparatus transmits high-frequency signals to a power receiving apparatus, with a controller adjusting the signal based on load information such as voltage and current to minimize rush currents without requiring additional circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection circuits and additional components are added to reduce rush current, then rush current damage is prevented, but apparatus size and manufacturing cost increase
Solution Approach 1:
The patent replaces physical protection circuits and components with a control system that uses feedback signals to regulate power transmission. The controller adjusts the power feeding based on load information, eliminating the need for additional hardware protection elements while maintaining reliability against rush current effects.
Solution Approach 2:
The system uses the load device itself to provide feedback information about its state (voltage, current, temperature). This self-diagnostic capability allows the power feeding apparatus to automatically adjust its output, making the load device contribute to its own protection without requiring external protection circuits.
2Reliability
If control based on load information is implemented, then rush current is reduced, but communication complexity increases
Solution Approach 1:
The communication system serves multiple functions: it transmits load information (voltage, current, temperature) from the power receiving apparatus to the power feeding apparatus, and also provides control signals back to the power supply. This multi-functionality reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent implements a feedback mechanism where the power receiving apparatus sends load information back to the power feeding apparatus. The controller uses this feedback to continuously adjust the power output, creating a closed-loop control system that automatically prevents rush current without requiring complex open-loop control circuits.
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
The system effectively reduces rush currents while maintaining a compact design and low costs by dynamically controlling the high-frequency signal based on load conditions, thereby extending device lifespan and reducing the need for protective circuitry.
Implementation Method 1
The power feeding system is configured to transmit, in a contactless fashion, electric power from the power feeding apparatus to a power receiving apparatus by magnetic coupling
Implementation Method 2
a power feeding resonator; a power supply configured to output a high-frequency signal to the power feeding resonator
Data Source
AI summary
Provided is a power feeding apparatus in a power feeding system that is configured to transmit, in a contactless fashion, electric power from the power feeding apparatus to a power receiving apparatus by magnetic coupling. The power feeding apparatus includes a power feeding resonator, a power supply, a communicator, and a controller. The power supply is configured to output a high-frequency signal to the power feeding resonator. The communicator is configured to receive load information from the power receiving apparatus. The load information includes information on at least a voltage between the voltage and a current of a load coupled to the power receiving apparatus. The controller is configured to perform, on the power supply, a control of the high-frequency signal on a basis of the load information received by the communicator, after starting of the output of the high-frequency signal by the power supply.