Wireless Power Tuning Circuitry for Light-Load Continuous Conduction
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Solution Overview
Problem
Conventional wireless power transfer systems face challenges in maintaining efficient operation at light load conditions due to the LCC compensation circuit's inability to ensure continuous conduction, leading to reduced current levels and inefficiencies.
Innovation Solution
The implementation of a resonant tuning network with a supplemental compensation circuit, including a series-series configuration of inductors and capacitors, which establishes inductive operation and mitigates current harmonics, ensuring efficient power transfer at varying load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If LCC compensation circuit is used to compensate for large inductive reactance of coupling coils, then coil size is reduced and higher currents can be injected into the transmitter coil, but continuous conduction operation cannot be ensured at light load conditions
Solution Approach 1:
The patent introduces a switching mechanism that dynamically changes the compensation circuit configuration based on load conditions. At light loads, the circuit switches between LCC and LLC modes to maintain continuous conduction, while at full power it operates in LCC mode for high current injection capability.
Solution Approach 2:
The patent changes the operating parameters of the compensation circuit by introducing a switching element that alters the circuit topology between LCC and LLC configurations. This parameter change enables the system to adapt to different load conditions and maintain reliable operation across the full power range.
2Power
If LCC compensation circuit operates at rated power levels, then high power transfer is achieved, but efficiency deteriorates at light load conditions
Solution Approach 1:
The switching mechanism dynamically adapts the compensation circuit configuration based on load demands. At light loads, the circuit transitions to LLC mode which maintains higher efficiency, while at rated power it switches to LCC mode for optimal power transfer capability.
Solution Approach 2:
The patent employs partial action by using only the necessary compensation mode for each operating condition. Instead of continuously operating in LCC mode for high power capability, the system uses LLC mode for light loads where full power capability is not needed, reducing energy losses.
3Device complexity
If conventional WPT system uses single charging point configuration, then system complexity is reduced, but power transfer reliability is insufficient for high-power EV charging
Solution Approach 1:
The patent segments the compensation circuit into multiple controllable sections with switching elements that can independently adjust each segment's configuration. This segmentation allows the system to maintain relatively simple overall structure while achieving reliable high-power transfer through coordinated segment control.
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 configuration enhances power factor and enables zero voltage switching, improving efficiency and maintaining continuous conduction at light loads, thus ensuring reliable high-power transfer for electric vehicle charging.
Implementation Method 1
a resonant tuning network including first circuitry coupled to the transmitter coil and second circuitry coupled between an output of the inverter and the first circuitry
Implementation Method 2
an inverter having an output, a transmitter coil configured to wirelessly transmit the high-frequency AC power
Data Source
AI summary
A wireless power supply power supply including first tuning circuitry coupled directly to a transmitter, the first tuning circuitry including an LCC configuration. The wireless power supply may include second tuning circuitry coupled directly to switching circuitry (e.g., an inverter) of the power supply, where the second tuning circuitry may be operable to direct power from the switching circuitry to the first tuning circuitry for supply to the transmitter, and where the second tuning circuitry includes a reactance operable to establish inductive operation of the switching circuitry at the switching frequency of the switching circuitry.