Wireless Power Receiver Battery Switching for Low Load Efficiency
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Solution Overview
Problem
Existing wireless power transmission systems experience low efficiency during low load conditions, leading to decreased power efficiency per time unit due to the design prioritizing high efficiency at heavy loads, resulting in prolonged low efficiency periods when loads are frequently in low power states.
Innovation Solution
A power receiving device with a power receiving antenna, rectifier circuit, detection circuit, load, battery, and control circuit that switches between power supply from the rectifier circuit and battery based on detected power levels, disconnecting the rectifier from the load and connecting the load to the battery when power is low to maintain efficient power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If wireless power transmission is performed during low load conditions, then the load can be powered continuously, but the transmitting efficiency becomes low
Solution Approach 1:
The battery is charged in advance during high load periods when transmitting efficiency is high. This stored energy is then used during low load periods to avoid inefficient wireless transmission, thus resolving the contradiction between continuous power supply and energy loss
Solution Approach 2:
The battery acts as an intermediary energy storage device between the wireless power transmission system and the load. It buffers the mismatch between transmission efficiency variations and load requirements, enabling continuous operation while minimizing energy loss
2Power
If the system is designed for high efficiency at heavy loads, then heavy load performance is optimized, but low load efficiency decreases
Solution Approach 1:
The system dynamically switches between wireless power transmission and battery power supply based on load conditions. During heavy loads, wireless transmission is used for high efficiency; during low loads, battery power is used to maintain productivity, thus resolving the contradiction between optimized heavy load performance and overall time-unit efficiency
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 solution increases power efficiency per time unit by ensuring power is supplied only under load conditions with higher efficiency, reducing energy loss during low power states and maintaining stable power delivery.
Implementation Method 1
a power receiving antenna that receives AC power from a power transmitting device including a power transmitting antenna that wirelessly transmits the AC power
Data Source
AI summary
A power receiving device includes a power receiving antenna that receives AC power from a power transmitting antenna, a rectifier circuit that converts the AC power into DC power, a detection circuit that detects the DC power, a load driven by the DC power, a battery that charges the DC power, a switching circuit that provides i) connection and disconnection between the rectifier circuit and the load and ii) connection and disconnection between the load and the battery, and a control circuit that controls the power receiving device. The control circuit controls the switching circuit to disconnect the rectifier circuit from the load and connect the load to the battery if the DC power is less than or equal to a power threshold value, and drive the load by the DC power charged in the battery.