Wireless Power Supply Impedance Mismatch Control
Solution Overview
Problem
Existing non-contact power transmission systems face inefficiencies due to impedance matching issues between the power transmitting and receiving units, leading to unnecessary energy consumption and potential malfunctions when the impedance of the power transmitting unit matches that of a device other than the power receiving unit or space.
Innovation Solution
A power supply system that includes a power source, a power transmitting unit, a detection device, a communication device, and a control device, which detects reflected power and adjusts impedance to optimize power transmission efficiency by stopping transmission if efficiency thresholds are not met, preventing impedance mismatch and ensuring high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If voltage applied to the power transmitting unit is changed to stabilize output, then power transmission stability is improved, but impedance may match with devices other than the power receiving unit causing energy waste
Solution Approach 1:
The patent implements a feedback mechanism where the control device receives information about the power receiving situation and detected reflected power, then adjusts the voltage applied to the power transmitting unit accordingly. This closed-loop control ensures stable power transmission while preventing impedance mismatch with non-target devices by continuously monitoring and adjusting based on actual power transfer conditions.
Solution Approach 2:
The control device dynamically changes the voltage parameter applied to the power transmitting unit based on detected reflected power and power receiving situation. By adjusting this electrical parameter in real-time, the system maintains optimal power transmission efficiency and prevents harmful impedance matching with other devices while preserving output stability.
2Productivity
If power transmission is continuously performed, then productivity is improved, but impedance mismatch with other devices causes harmful effects
Solution Approach 1:
The system continuously monitors reflected power and power receiving situation, using this feedback to determine when to continue or stop power transmission. This enables high productivity through continuous operation while preventing harmful effects by stopping transmission when impedance mismatch with non-target devices is detected.
Solution Approach 2:
The control device takes preliminary action by detecting reflected power before significant energy waste or harmful effects occur. By monitoring the power receiving situation and reflected power levels, the system can preemptively adjust or stop transmission to prevent impedance mismatch harm while maintaining high productivity during normal operation.
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 prevents impedance mismatch, ensuring high power transmission efficiency and preventing potential malfunctions by dynamically controlling power transmission based on detected efficiency and reflected power levels.
Implementation Method 1
a power transmitting unit in the power supply device resonates with a power receiving unit in the power receiving device through an electromagnetic field to supply electric power from the power supply device to the power receiving device in a non-contact manner
Implementation Method 2
The non-contact power transmitting device includes a primary coil, a secondary coil... In the secondary coil, a voltage is induced by the primary coil
Implementation Method 3
The detection device detects reflected electric power to the power source device
Data Source
AI summary
A power supply device supplies electric power to a power receiving device including a power receiving unit in a non-contact manner. The power supply device includes a power source device that generates electric power with a predetermined frequency; a power transmitting unit that receives the electric power from the power source device, and that resonates with the power receiving unit through an electromagnetic field, thereby transmitting the electric power to the power receiving unit in the non-contact manner; a detection device that detects reflected electric power to the power source device; a communication device that receives information regarding a power receiving situation in the power receiving device; and a control device that controls electric power transmission from the power transmitting unit based on the information regarding the power receiving situation and the reflected electric power.