Wireless Power Resonance Current Stabilization
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Solution Overview
Problem
Existing wireless power transmission systems face issues with insufficient resonance current in the power receiving resonant circuit due to low magnetic coupling between coils, leading to unstable power transfer, especially when load resistance varies.
Innovation Solution
A wireless power transmission system with a power transmitting coil and a power receiving coil, where a resonant circuit composed of a resonance capacitance and a power receiving coil current control circuit adjusts the resonance current to a target value by applying a pulse-like voltage waveform in series, stabilizing the resonance current and enhancing power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power transmitting coil and power receiving coil are separated to enable wireless power transmission, then wireless power transmission is achieved, but the magnetic coupling coefficient becomes small and the resonance current in the power receiving resonant circuit becomes insufficient
Solution Approach 1:
The patent introduces a current control circuit as an intermediary component between the power receiving coil and the load. This control circuit actively regulates the resonance current in the power receiving resonant circuit, compensating for the insufficient magnetic coupling caused by coil separation. The control circuit serves as a mediator that enhances the effective power transfer despite the physical distance between transmitting and receiving coils.
2Power
If a DC voltage conversion circuit (chopper circuit) is used to convert impedance and increase resonance current, then the Q factor of the power receiving resonant circuit becomes high and power received increases, but the output voltage becomes abnormal when load resistance is large and resonance current becomes unstable
Solution Approach 1:
The patent implements a feedback control mechanism where the current control circuit continuously monitors the resonance current in the power receiving resonant circuit and adjusts its operation accordingly. This feedback system detects changes in load conditions and automatically regulates the current to maintain stability, preventing the abnormal voltage outputs and current instability that occur with fixed-ratio chopper circuits when load resistance varies.
Solution Approach 2:
The patent transitions from a static impedance conversion approach (fixed duty ratio chopper circuit) to a dynamic control approach. The current control circuit continuously adapts its operation based on real-time conditions in the resonant circuit and load, allowing the system to maintain optimal performance across varying load resistances. This dynamic adjustment prevents the stability issues that arise with fixed conversion ratios.
3Ease of operation
If the magnetic coupling between coils is reduced due to separation, then wireless power transmission is enabled, but the current in the power receiving resonant circuit becomes insufficient leading to insufficient wireless power supply
Solution Approach 1:
The current control circuit acts as an intermediary that compensates for the power loss due to reduced magnetic coupling. By actively regulating the resonance current, the control circuit ensures that sufficient power is delivered to the load even when the transmitting and receiving coils are separated, thereby maintaining power transmission efficiency despite the reduced coupling coefficient.
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 stably increases resonance current in the power receiving coil, thereby increasing the power received by the power receiving coil, ensuring stable and efficient wireless power transmission.
Implementation Method 1
a power transmitting coil (1) that generates a magnetic field with an alternating current; a power receiving coil (2) that causes voltage induced by the current in the power transmitting coil (1)
Implementation Method 2
a resonant circuit composed of a resonance capacitance and a power receiving coil (2)
Data Source
AI summary
The present invention increases received electrical power received by a power receiving coil by stably increasing a resonance current in the power receiving coil of a wireless power transmission system. The present invention makes use of the wireless power transmission system comprising: a power transmitting coil for generating a magnetic field via an alternating current and a power receiving coil for generating an induced voltage via electromagnetic induction of the power transmitting coil; a power receiving resonant circuit formed by connecting a resonance capacitance to the power receiving coil; a control means for controlling in which the resonance current in the power receiving resonant circuit is matched to a target value; a power receiving coil current control circuit that is controlled by the control means and applies electrical power to the power receiving resonant circuit to increase the resonance current; and a load circuit for receiving power from the power receiving resonant circuit, wherein the power receiving coil current control circuit operates by being supplied with electrical power applied to the power receiving resonant circuit from the load circuit.