Resonant Frequency Control in Wireless Power for Load-Change Stability
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Solution Overview
Problem
Existing wireless electric energy transmission systems face power failures due to slow loop control responses when the load dynamically changes, leading to unstable output voltages.
Innovation Solution
A wireless electric energy transmission system that detects and maintains a constant-voltage operating frequency through calculation, using a series resonant circuit with a DC/AC inverter circuit, a first inductor, and a first capacitor, and a series AC/DC rectifier circuit with a second inductor and capacitor, to ensure the output voltage remains steady despite load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If loop control is used to maintain steady output voltage, then output voltage stability is improved, but response speed deteriorates causing power failures when load dynamically changes
Solution Approach 1:
The system performs preliminary detection of constant-voltage operating frequency before load changes occur. By detecting this frequency in advance and using it to control the transmitter, the system prepares the optimal operating point beforehand, enabling immediate response to load changes without waiting for loop control feedback, thus resolving the contradiction between stability and response speed
Solution Approach 2:
The constant-voltage operating frequency serves as an intermediary parameter that bridges the transmitter and receiver. Instead of directly controlling output voltage through slow loop feedback, the system uses this frequency intermediary to achieve rapid voltage stabilization. The frequency detection and control mechanism acts as a mediator that translates load requirements into appropriate transmitter operating parameters instantaneously
2Stability of the object's composition
If operating frequency is constantly modulated to adapt to load changes, then output voltage stability is improved, but system complexity increases
Solution Approach 1:
The invention extracts the constant-voltage operating frequency as a separate, detectable parameter from the complex control process. By isolating this specific frequency characteristic and using it as the primary control variable, the system simplifies the control architecture while maintaining voltage stability. Instead of managing multiple interdependent control parameters, the system focuses on detecting and maintaining this single critical frequency parameter
Solution Approach 2:
The system enables the transmitter to self-adjust by detecting its own constant-voltage operating frequency and using this information to maintain optimal performance. The frequency detection mechanism provides self-service feedback that automatically guides frequency modulation without requiring complex external control systems, thereby achieving voltage stability with reduced system complexity
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 improves output voltage stability by dynamically adjusting the operating frequency, reducing power failures and ensuring steady power supply even with changing loads.
Implementation Method 1
Electric energy of the transmitter is transmitted to the receiver through electromagnetic induction between the first inductor and the second inductor
Implementation Method 2
A value of a resonant frequency of the transmitter is detected. A series resonant circuit has a frequency selection characteristic
Data Source
AI summary
A wireless electric energy transmission system is provided, including a transmitter and a receiver. The transmitter includes a DC/AC inverter circuit, a first inductor, and a first capacitor that are connected in series. The transmitter is configured to: detect a value of a resonant frequency of the transmitter; detect a value of a coupling coefficient between the transmitter and the receiver; obtain a value of a constant-voltage operating frequency of the transmitter through calculation based on the resonant frequency and the coupling coefficient; and control an operating frequency of the DC/AC inverter circuit based on the constant-voltage operating frequency obtained through calculation.