Noncontact Power Supply Voltage Control via Dynamic Resonance Suppression
Solution Overview
Problem
Existing noncontact power supply systems face inefficiencies due to intermittent power transmission and reduced power factor caused by repeated resonance suppression and reactivation, leading to excessive output voltage and increased energy loss.
Innovation Solution
A noncontact power supply apparatus with a power transmitter device that adjusts switching frequency and voltage of the transmitter coil based on output voltage abnormalities, and a power receiver device with a resonance suppressing coil that short-circuits to control output voltage, communicating with the transmitter to maintain constant voltage output and prevent energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resonance suppressing coil is used to suppress excessive output voltage, then output voltage can be controlled, but power transmission efficiency decreases and energy loss increases
Solution Approach 1:
The patent applies dynamics by making the resonance suppressing coil's connection state changeable through a switching element. The coil can be dynamically connected or disconnected from the resonance circuit based on detected output voltage levels, allowing the system to adapt between voltage suppression mode and efficient power transmission mode, thus resolving the contradiction between voltage control reliability and energy loss.
Solution Approach 2:
The patent implements self-service through a control circuit that automatically detects output voltage abnormalities and autonomously controls the switching element to connect or disconnect the resonance suppressing coil. This self-regulating mechanism eliminates the need for external intervention, maintaining voltage control while minimizing energy loss by only activating the suppressing coil when necessary.
2Reliability
If resonance suppression is repeatedly activated and deactivated, then output voltage can be maintained within limits, but power transmission becomes intermittent and power factor decreases
Solution Approach 1:
The patent applies feedback by using a detection circuit to continuously monitor output voltage and feed this information to the control circuit. The control circuit uses this feedback to intelligently determine when to activate or deactivate the resonance suppressing coil, maintaining voltage stability while minimizing interruptions to power transmission. The feedback mechanism ensures the coil is only activated when voltage abnormalities occur, preserving transmission continuity.
3Reliability
If the resonance suppressing coil is kept connected to prevent voltage increase, then output voltage remains stable, but power factor is reduced and energy loss increases
Solution Approach 1:
The patent applies dynamics by making the resonance suppressing coil's connection state changeable through a switching element. The coil can be dynamically connected or disconnected from the resonance circuit based on detected output voltage levels, allowing the system to adapt between voltage suppression mode and efficient power transmission mode, thus resolving the contradiction between voltage control reliability and energy loss.
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 suppresses excessive output voltage and maintains continuous power transmission while reducing energy loss by dynamically adjusting the power transmission parameters in response to output voltage abnormalities.
Implementation Method 1
a power transmitter device 2 and a power receiver device 3 to which the power transmitter device 2 transmits power across space in a noncontact manner
Implementation Method 2
a resonance circuit including a receiver coil 21 configured to receive the power from the power transmitter device 2
Implementation Method 3
a resonance suppressing coil 31 disposed so as to be electromagnetically coupled to the receiver coil 21
Data Source
AI summary
A power receiver device a noncontact power supply apparatus short-circuits a resonance suppressing coil provided so as to be electromagnetically coupled to a receiver coil and notifies a power transmitter device of an output voltage abnormality when a measured value of output voltage becomes equal to or greater than an upper limit threshold, the measured value of output voltage being obtained by rectifying power received via a resonance circuit including a receiver coil configured to receive power from a transmitter coil of the power transmitter device and a resonance capacitor connected in parallel with the receiver coil. Upon receipt of the notification of the output voltage abnormality, the power transmitter device changes at least one of a voltage and switching frequency of AC power applied to the transmitter coil.