Wireless Charging Input Voltage Control for Receiver Voltage Drops
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless charging technologies fail to effectively detect and respond to voltage drops in power reception devices, leading to decreased charging efficiency due to lack of notification from the devices about voltage drops, resulting in unchanged input voltage from the power transmission device.
Innovation Solution
A power transmission device equipped with a control circuit that determines voltage drop events based on changes in frequency, duty ratio, or current and voltage applied to a coil, and adjusts the input voltage accordingly to maintain efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power transmission device maintains input voltage without change, then the device operation is simple, but wireless charging efficiency decreases when voltage drop events occur
Solution Approach 1:
The control circuit continuously monitors charging power and compares it with transmit power to detect voltage drop events. When a voltage drop is detected through power difference analysis, the control circuit automatically adjusts the input voltage to maintain optimal charging efficiency, creating a closed-loop feedback system that resolves the contradiction between simple operation and efficiency maintenance.
Solution Approach 2:
The power transmission device autonomously detects voltage drop events by analyzing the difference between transmit power and charging power feedback from the reception device. The system self-adjusts the input voltage without external intervention, enabling the device to maintain high charging efficiency while automatically adapting to voltage drop conditions without requiring complex external control systems.
2Loss of energy
If the power reception device does not notify the power transmission device of voltage drops, then communication protocol is simple, but charging efficiency cannot be maintained
Solution Approach 1:
The system uses charging power feedback from the reception device as an indirect indicator of voltage drop conditions. By continuously monitoring the difference between transmit power and received charging power, the transmission device can infer voltage drop events without requiring direct notification from the reception device, thus maintaining simple communication protocols while enabling efficient voltage adaptation.
Solution Approach 2:
Charging power information serves as an intermediary parameter that conveys voltage drop conditions from the reception device to the transmission device. Instead of requiring direct voltage drop notifications, the system uses charging power measurements as a mediator to transmit information about reception device status, allowing the transmission device to detect and respond to voltage drops through power analysis.
3Productivity
If the input voltage is adjusted based on voltage drop detection, then charging efficiency is improved, but control complexity increases
Solution Approach 1:
The control circuit implements a feedback-based voltage adjustment mechanism that monitors charging power and automatically modifies input voltage in response to detected voltage drop events. This feedback loop enables the system to maintain optimal charging speed by dynamically adapting voltage levels, resolving the contradiction between improved productivity and increased control complexity through automated decision-making algorithms.
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
The solution enables the power transmission device to detect voltage drops in power reception devices and adjust input voltage, thereby improving wireless charging efficiency by ensuring optimal power delivery and preventing communication errors.
Implementation Method 1
a coil configured to transmit a radio signal to the external electronic device based on a transmit power
Data Source
AI summary
Disclosed is a power transmission device for wirelessly supplying power to an external electronic device, the power transmission device comprising: a coil configured to transmit a wireless signal to the electronic device based on a transmission power; a power generation circuit configured to supply, to the coil, the transmission power generated based on an input voltage; and a control circuit electrically connected to the coil and the power generation circuit, wherein the control circuit is configured: to receive information about charging power from the electronic device; to determine whether a voltage drop event related to a drop of the internal voltage of the electronic device has occurred, based on the difference between the transmission power and the charging power; and to regulate the level of the input voltage based on results obtained from the determination.