Wireless Power Transfer Feedback Control for Coil Coupling Variation
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Solution Overview
Problem
Wireless charging efficiency is affected by the coupling between transmitting and receiving coils, leading to reduced power transfer in devices due to positional tolerances, which existing control methods struggle to optimize effectively.
Innovation Solution
Implementing feedback control schemes in wireless power systems that include rectifier circuitry and control circuitry in receiving devices to dynamically regulate output voltage based on inverter input voltage status and measured characteristics, allowing for adaptive adjustment of target output voltage levels and fold-back modes to maintain efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless power transfer is implemented with fixed control parameters, then device complexity is reduced, but wireless charging efficiency deteriorates under varying coupling conditions
Solution Approach 1:
The patent implements feedback control by having the receiving device measure its output voltage and communicate this information back to the transmitting device. The transmitting device then adjusts its inverter output voltage based on this feedback to maintain optimal power transfer efficiency under varying coupling conditions, thereby resolving the contradiction between simple control and efficient power transfer.
Solution Approach 2:
The patent employs dynamic adjustment of control parameters (inverter output voltage) based on real-time operating conditions. The system transitions from fixed parameters to dynamically adjustable parameters, allowing the wireless power transfer system to adapt to changing coupling conditions and maintain high efficiency without requiring overly complex control architecture.
2Loss of energy
If dynamic feedback control is implemented to optimize power transfer, then wireless charging efficiency is improved, but device complexity increases
Solution Approach 1:
The patent uses feedback control where the receiving device measures output voltage and communicates status messages to the transmitting device, which adjusts inverter output accordingly. This feedback mechanism enables efficient power transfer while distributing control complexity across both transmitting and receiving devices rather than concentrating it in one location.
Solution Approach 2:
The receiving device autonomously measures its own output voltage characteristics and communicates this information to the transmitting device, which then self-adjusts its inverter output. This self-service approach allows dynamic optimization of power transfer efficiency without requiring a highly complex centralized control system.
3Power
If the transmitting device operates at maximum inverter input voltage, then power output is maximized, but the ability to regulate output voltage deteriorates when coupling conditions change
Solution Approach 1:
The patent implements dynamic adjustment of the inverter input voltage based on feedback about actual power transfer conditions. Instead of operating at fixed maximum voltage, the system dynamically modulates the voltage level to maintain both high power output and adaptability to changing coupling conditions, resolving the contradiction between maximum power and regulation capability.
Solution Approach 2:
The patent changes the operating parameter (inverter input voltage) dynamically based on measured power transfer efficiency and coupling conditions. By adjusting this key parameter in response to feedback, the system maintains both high power output and the ability to adapt to varying coupling conditions, overcoming the limitation of fixed maximum voltage operation.
4Stability of the object's composition
If rectifier output voltage is regulated at a fixed target level, then voltage stability is improved, but power transfer efficiency deteriorates under varying load and coupling conditions
Solution Approach 1:
The patent transitions from fixed target voltage regulation to dynamic target voltage adjustment. The receiving device determines an optimal target rectifier output voltage based on measured characteristics and communicates this to the transmitting device, which adjusts its inverter output accordingly. This dynamic approach maintains both voltage stability and power transfer efficiency under varying conditions.
Solution Approach 2:
The patent changes the target rectifier output voltage parameter dynamically based on measured system characteristics and operating conditions. By adjusting this parameter rather than maintaining a fixed value, the system achieves both voltage stability and high power transfer efficiency across varying load and coupling conditions.
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
Enhances wireless charging efficiency by optimizing power transfer across varying coupling conditions, ensuring reliable charging even in suboptimal alignments and load changes, thereby improving overall system performance.
Implementation Method 1
Coils in the power transmitting and receiving devices are used to transmit and receive wireless power signals
Implementation Method 2
rectifier circuitry coupled to the wireless power transfer coil and configured to rectify signals from the wireless power transfer coil into output voltage
Data Source
AI summary
Portable electronic devices such as cellular telephones, wristwatch devices, tablet computers, wireless earbuds, and other portable devices use batteries. The batteries in these devices may be charged using a wireless power system. For example, a user may place devices such as tablet computers and cellular telephones on a wireless charging puck or mat to wirelessly charge these devices. Wireless power systems include a power transmitting device and a power receiving device. Coils in the power transmitting and receiving devices are used to transmit and receive wireless power signals. The coupling between the transmitting and receiving coils may affect the wireless charging efficiency and the power produced in the receiving device. Disclosed herein are feedback control schemes to optimize efficiency of wireless power transfer systems.