Wireless Power Feeder Resonance Control Circuit
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Solution Overview
Problem
Current wireless power feeding technologies, particularly the magnetic field resonance type, lack a mechanism for effectively controlling the magnitude of transmission power, leading to inefficiencies and increased costs due to the use of DC/DC converters which incur power loss.
Innovation Solution
A wireless power feeder system that utilizes a power transmission control circuit, a control signal generation circuit, and a comparison circuit to generate an enable signal based on a predetermined magnitude relationship between control and reference signals, allowing for adjustable power transmission by controlling the time ratio of power feeding and dormant periods, thereby minimizing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DC/DC converter is used to control transmission power magnitude, then power transmission control is achieved, but power loss of 10 to 20% occurs and cost increases
Solution Approach 1:
The patent extracts and removes the DC/DC converter from the power transmission system, replacing it with a direct AC power control approach using the existing magnetic field resonance mechanism. This eliminates the source of 10-20% power loss while maintaining power transmission control capability through the resonance coupling between transmitting and receiving coils.
Solution Approach 2:
The patent replaces the mechanical/electronic DC/DC conversion system with a magnetic field-based resonance system. By utilizing electromagnetic resonance between coils at the same frequency, power transmission is achieved without mechanical conversion losses, substituting a lossy electronic conversion system with a loss-free magnetic coupling system.
2Ease of operation
If DC/DC converter is used to control transmission power magnitude, then power transmission control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent removes the DC/DC converter and associated control circuitry from the system, simplifying the device architecture. Power transmission control is achieved through the inherent characteristics of the magnetic resonance system rather than complex electronic conversion equipment, reducing both device complexity and cost.
Solution Approach 2:
The patent makes the magnetic resonance system perform multiple functions: power transmission, power control, and voltage regulation. By tuning the resonance frequency and coupling strength, the same magnetic field system achieves what previously required separate DC/DC conversion and control circuits, reducing overall system complexity.
3Loss of energy
If magnetic field resonance type is used for wireless power feeding, then high power transmission efficiency is achieved in intermediate range, but mechanism for controlling transmission power magnitude is lacking
Solution Approach 1:
The patent introduces dynamic control capability to the magnetic resonance system by enabling adjustment of transmission power magnitude. Through controllable coupling between transmitting and receiving coils, the system can dynamically regulate power transfer while maintaining high efficiency, transforming a static resonance system into a controllable dynamic system.
Solution Approach 2:
The patent controls transmission power by changing system parameters such as coupling coefficient, resonant frequency, or coil impedance. By adjusting these parameters, the magnetic resonance system achieves power magnitude control without sacrificing transmission efficiency, as the resonance mechanism adapts to the desired power level rather than relying on lossy electronic conversion.
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 precise control of transmission power in wireless power feeding, reducing power loss and costs, while maintaining high transmission efficiency and flexibility in power adjustment.
Implementation Method 1
utilizes a magnetic field resonance phenomenon between the feeding coil and receiving coil
Implementation Method 2
When AC power is fed to the exciting coil, current also flows in the feeding coil according to the principle of electromagnetic induction
Implementation Method 3
a comparison circuit that generates an enable signal when a predetermined magnitude relationship is established between the level of the control signal and that of a predetermined reference signal
Implementation Method 4
The power transmission control circuit feeds the AC power to the feeding coil under only while the enable signal is being generated
Data Source
AI summary
Power is fed from a feeding coil to a receiving coil by magnetic resonance. A drive circuit outputs an IN signal generated by an oscillator as a DR signal to alternately turn ON/OFF switching transistors at a resonance frequency, whereby AC current is fed to the feeding coil, and then the AC current is fed from the feeding coil to the receiving coil. An enable signal generation circuit generates an EN signal at a frequency lower than the resonance frequency. The drive circuit outputs the DR signal only while the EN signal assumes a high level. Transmission power from a wireless feeder to a wireless receiver is controlled by adjusting the duty ratio of the EN signal.