Resonant Wireless Power Circuit for Stable Output Voltage
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Solution Overview
Problem
Existing wireless power transmission systems for customer premise equipment (CPE) face challenges in maintaining stable output voltage due to dynamic changes in load, leading to untimely power system shutdowns due to slow response times in loop control adjustments.
Innovation Solution
The implementation of a wireless power transmission system using series resonant circuits with a transmitter and receiver, where the transmitter includes a DC/AC inverter circuit, a resonant inductor, and a compensation inductor, and the receiver includes an AC/DC rectifier circuit, a resonant inductor, and a compensation inductor, allowing for electromagnetic induction and maintaining a constant voltage output by adjusting the operating frequency based on resonant frequency and coupling coefficient calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If loop control is used to maintain stable output voltage, then output voltage stability is improved, but response time becomes slow causing power system shutdowns
Solution Approach 1:
The patent changes the operating frequency parameter of the transmitter to match the resonant frequency of the series resonant circuit. By operating at resonant frequency, the system achieves both fast response to load changes and stable output voltage without the delays associated with loop control. The frequency is calculated based on the coupling coefficient and resonant frequency parameters.
Solution Approach 2:
The patent utilizes electromagnetic resonance in the series resonant circuit, which operates at a specific resonant frequency. This resonance phenomenon enables the system to respond rapidly to load changes while maintaining stable voltage output, eliminating the slow response problem of conventional loop control methods.
2Device complexity
If wireless power transmission is implemented, then installation complexity is reduced, but maintaining stable output voltage under dynamic load becomes difficult
Solution Approach 1:
The patent calculates and adjusts the operating frequency based on the coupling coefficient between transmitter and receiver coils, and the resonant frequency of the series resonant circuit. This parameter adjustment enables stable output voltage under dynamic load conditions while maintaining the wireless transmission advantage of reduced installation complexity.
Solution Approach 2:
The system incorporates feedback mechanisms where the calculated operating frequency is continuously adjusted based on coupling coefficient measurements and resonant frequency detection. This feedback loop ensures stable output voltage is maintained even as load conditions change, without requiring complex wired installations.
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
This approach ensures a stable output voltage that is independent of the receiver's load, enabling dynamic response and preventing power system shutdowns by maintaining a constant voltage operating frequency, even with changes in load conditions.
Implementation Method 1
power at the transmitter is transmitted to the receiver through electromagnetic induction between the first resonant inductor and the second resonant inductor
Implementation Method 2
series resonant circuits with a transmitter and receiver, where the transmitter includes a DC/AC inverter circuit, a resonant inductor, and a compensation inductor
Data Source
Figure 1~2A-1
Figure 2A-2
Figure 2A-3~2A-4
AI summary
This application provides a wireless power transmission system. The system includes a transmitter and a receiver, where the transmitter includes a DC/AC inverter circuit, a first resonant inductor, a first capacitor, and a first compensation inductor that are connected in series; and the receiver includes an AC/DC rectifier circuit, a second resonant inductor, a second capacitor, and a second compensation inductor that are connected in series; and power at the transmitter is transmitted to the receiver through electromagnetic induction between the first resonant inductor and the second resonant inductor, and the AC/DC rectifier circuit is configured to provide the rectified power to a load of the receiver. This solution is applicable to a wireless power supply scenario or a wireless charging scenario.