Wireless Power Negotiation with Loss-Aware Power Reservation
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Solution Overview
Problem
Existing wireless power systems face challenges in efficiently negotiating the amount of power that can be transmitted between a Power Transmitter and a Power Receiver, particularly when multiple transmitters share a limited power supply, leading to potential overloading and circuit breaker tripping.
Innovation Solution
The implementation of a power negotiation method where the Power Transmitter receives a power negotiation value from the Power Receiver, estimates power transmission losses, and negotiates a Negotiated Power based on this value, allowing for efficient power reservation and transfer while accounting for both the Power Receiver's load and transmission losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple Power Transmitters share a limited power supply to operate simultaneously, then power delivery capability is improved, but risk of overloading and circuit breaker tripping increases
Solution Approach 1:
The system performs preliminary power negotiation before actual power transfer. The Power Receiver sends a power negotiation value indicating its power requirement, and the Power Transmitter estimates transmission losses to determine the total power needed from the shared power supply. This advance planning allows multiple transmitters to coordinate their power requests and avoid exceeding the power supply capacity.
Solution Approach 2:
The power negotiation mechanism establishes a feedback loop where the Power Receiver communicates its power needs to the Power Transmitter, which then calculates the required power reservation considering transmission losses. This feedback enables the system to dynamically adjust power allocation among multiple transmitters sharing a common power supply, preventing overloading while maximizing power delivery capability.
2Reliability
If Power Transmitter reserves more power to account for transmission losses, then reliability of power delivery is improved, but power supply capacity for other devices is reduced
Solution Approach 1:
The system dynamically calculates the power reservation parameter based on the specific transmission losses estimated for each negotiation. Instead of using a fixed conservative margin, the Power Transmitter adjusts the reserved power amount according to the actual transmission conditions and receiver requirements. This allows optimal power allocation that ensures reliable delivery while maximizing the remaining capacity available for other devices on the shared power supply.
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 enables efficient and effective power negotiation between Power Transmitters and Receivers, preventing overloading and ensuring reliable operation of cordless appliances by accurately determining the required power reserves, thus avoiding circuit breaker tripping.
Implementation Method 1
The Power Transmitter may include a primary coil that uses magnetic induction to charge the Power Receiver. For example, the primary coil may produce an electromagnetic field.
Implementation Method 2
The Power Receiver may capture the electromagnetic field using a secondary coil and may convert it to electric power or use it for direct induction heating.
Implementation Method 3
The method may include estimating, at the Power Transmitter, power transmission losses (PTx-loss) associated with components of the Power Transmitter.
Implementation Method 4
The Power Receiver may capture the electromagnetic field using a secondary coil and may convert it to electric power or use it for direct induction heating.
Data Source
AI summary
This disclosure provides systems, methods and apparatuses for power negotiation in a wireless power system. The power negotiation enables a Power Transmitter and a Power Receiver to reserve an amount of power that the Power Transmitter can provide to the Power Receiver. The power negotiation technique can account for power transmission losses (PTx-loss) and power reception losses (PRx-loss). During a power negotiation (in a connected phase), a power negotiation value from the Power Receiver to the Power Transmitter accounts for PRx-loss and omits the PTx-loss. The Power Transmitter itself can determine the PTx-loss and adjust the power negotiation value to account for such losses and determine a Negotiated Power level. Thereafter, during the power transfer phase, the Power Receiver can communicate changes to the requested power and the Power Transmitter can account for PTx-loss during control of the wireless power transmission.