Power Receiving Control Circuit Bypass for Wireless Charging
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Solution Overview
Problem
Contactless power transmission systems experience power loss and heat generation issues due to the regulator, leading to overshoot and undershoot during temporary power stops and restarts, which can damage circuits and hinder efficient charging of secondary batteries.
Innovation Solution
A power receiving control device that includes a rectifying circuit, a regulator, and a switch circuit, where a bypass path is formed to reduce power loss and heat generation by controlling the power supply through a power receiving side control circuit, which monitors voltage levels and switches the bypass path on and off to stabilize the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a bypass path bypassing the regulator is formed to reduce power loss and heat generation, then power loss and heat generation are reduced, but overshoot and undershoot occur when power feeding is temporarily stopped or restarted
Solution Approach 1:
The bypass switch is dynamically controlled based on the operational state. It is turned off during temporary power stop periods and turned on after stabilization, allowing the system to adapt between bypass mode (low loss) and regulator mode (stable control) according to real-time requirements
Solution Approach 2:
The bypass switch operates periodically - turned off during load modulation when power feeding is temporarily stopped, and turned on during normal power transmission. This periodic switching prevents overshoot/undershoot during critical periods while maintaining energy efficiency during stable operation
2Temperature
If a bypass path bypassing the regulator is formed to reduce heat generation, then heat generation is reduced, but circuit damage may occur due to overshoot and undershoot
Solution Approach 1:
The bypass switch is proactively turned off before temporary power stop occurs (during load modulation detection), preventing the conditions that would lead to overshoot and subsequent circuit damage. This preliminary action eliminates the harmful effect before it can manifest
3Manufacturing precision
If the regulator is used for highly accurate output control, then charging control precision is improved, but power loss and charging time increase
Solution Approach 1:
The system dynamically switches between regulator-based precise control mode and bypass-based high-speed charging mode. During stable power transmission, the bypass path enables fast charging with minimal loss. When precise control is needed or during temporary stops, the regulator takes over, optimizing both speed and precision at different times
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 effectively reduces power loss and heat generation, prevents overshoot and undershoot, and improves the power feeding capability to secondary batteries, enhancing charging efficiency and reliability.
Implementation Method 1
a contactless power transmission technique, which utilizes electromagnetic induction so as to enable power transmission even without a metallic contact point
Data Source
AI summary
A power receiving control device provided to a power receiving device in a contactless power transmission system that transmits power from a power transmission device by electromagnetically coupling primary and secondary coils to feed electric power to a load. The power receiving control device includes a power receiving side control circuit. The power receiving side control circuit turns on a switch circuit provided between input and output nodes of a regulator in the power receiving device based on detecting lowering power feeding capability. The power receiving side control circuit turns off the switch circuit when power feeding is temporarily stopped in a period when the regulator is bypassed when voltage of a power supply control signal output terminal switches levels or before the power feeding is temporarily stopped. The power receiving side control circuit turns on the switch circuit after releasing the temporary stop of power feeding.