Wireless Power Receiver Self-Powering via Magnetic Field Harvesting
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Solution Overview
Problem
In wireless power transfer systems, the receiver controller must remain in a powered or low power state to establish communication with the transmitter controller, requiring external power from vehicle batteries, which is inefficient and limits initiation of power transfer to when the vehicle is parked near the source resonator.
Innovation Solution
A wireless power receiver with a capture resonator that generates an alternating electrical current from the magnetic field, a current conversion circuit to produce direct current, and a voltage regulator circuit to power the controller, allowing activation without external power, enabling communication and power transfer initiation even in low power or no power states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver controller remains in a powered or low power state to establish communication with the transmitter controller, then communication capability is improved, but energy consumption from vehicle batteries increases
Solution Approach 1:
The receiver controller powers itself by harvesting energy from the alternating magnetic field generated by the source resonator. The capture resonator converts the magnetic field energy into electrical current, which is then rectified and regulated to supply power to the controller, eliminating the need for external battery power during standby mode.
Solution Approach 2:
The capture resonator acts as an intermediary that converts the alternating magnetic field from the source resonator into electrical current. This intermediate conversion enables the receiver controller to obtain power wirelessly from the magnetic field without direct electrical connection to the vehicle battery.
2Reliability
If the receiver controller is maintained in a powered state, then communication with transmitter controller is ensured, but power transfer initiation is limited to when vehicle is parked near source resonator
Solution Approach 1:
The receiver controller is pre-powered by the alternating magnetic field before communication and power transfer initiation. This preliminary power supply enables the controller to be in an active state ready for communication as soon as the vehicle is in proximity to the source resonator, without waiting for battery power availability.
3Reliability
If external power from vehicle batteries is used to power the receiver controller, then controller operation is ensured, but efficiency is reduced and charging initiation is limited
Solution Approach 1:
The receiver controller powers itself by harvesting energy from the alternating magnetic field generated by the source resonator. The capture resonator converts the magnetic field energy into electrical current, which is then rectified and regulated to supply power to the controller, eliminating the need for external battery power during standby mode.
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
Enables automatic powering of the receiver and initiation of charging without external power, allowing for efficient power transfer and charging even when the vehicle battery is low or 'dead', reducing reliance on vehicle batteries for standby power.
Implementation Method 1
a capture resonator that is configured to produce an alternating electrical current when excited by the alternating magnetic field
Data Source
AI summary
A wireless power receiver configured to control an electrical connection between a capture resonator of a wireless power transfer system and an electrical load, such as a battery pack or electric motor. The circuitry of the wireless power receiver is powered directly by the power output from the capture resonator, automatically powering up the wireless power receiver as soon as the capture resonator begins producing power. The wireless power receiver 16 does not require stand-by power provided by an external source, such as a vehicle battery. Since the wireless power receiver does not require power from an external source, it can initiate charging of a vehicle battery even if the state of charge of the battery in the vehicle is too low to operate the controller.