Bypass Switch Circuit for Non-Contact Power Reception
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Solution Overview
Problem
Non-contact power transmission systems experience higher power loss and heat generation when charging secondary batteries, such as lithium-ion batteries, due to inefficiencies in the charging process, leading to longer charging times and potential safety issues.
Innovation Solution
A power reception control device with a switch circuit that bypasses the regulator when voltage levels decrease, forming a low-loss path to supply power directly to the load, thereby reducing power loss and heat generation, and incorporating a bypass control circuit to manage the regulator's operation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regulator is used to charge a secondary battery with non-contact power transmission, then the charging process can be controlled, but power loss and heat generation increase
Solution Approach 1:
The patent dynamically switches between two charging paths: using the regulator for precise charge control when needed, and bypassing the regulator through a switch circuit when high current is required. This dynamic adaptation allows the system to optimize between control accuracy and power efficiency based on real-time charging conditions.
Solution Approach 2:
The charging path is segmented into two parallel routes: one through the regulator for controlled charging, and another bypass path for efficient high-power charging. This segmentation allows the system to select the optimal path for different charging stages, reducing overall power loss.
2Reliability
If a regulator is used to charge a secondary battery, then charge management can be achieved, but heat generation increases
Solution Approach 1:
The system dynamically adjusts the charging path based on temperature and power conditions. When the regulator would generate excessive heat, the control circuit activates the bypass switch to route power through the lower-heat path, thereby managing thermal output while maintaining charge control capability.
Solution Approach 2:
The patent converts the potential harm of regulator heat generation into a benefit by providing an alternative bypass path that becomes active when heat would be problematic. This transforms the regulator's thermal limitation from a system weakness into an opportunity for optimized thermal management.
3Ease of operation
If non-contact power transmission is used for charging, then convenience is improved, but charging efficiency decreases
Solution Approach 1:
The system dynamically optimizes the power transmission path by switching between regulator-based charging and bypass charging modes. This dynamic adjustment compensates for the inherent inefficiencies of non-contact power transmission by selecting the most efficient path available at each moment, thereby improving overall charging efficiency while maintaining convenience.
Solution Approach 2:
The patent changes operational parameters by adjusting the switching state of the bypass circuit based on real-time monitoring of power transmission efficiency. When non-contact transmission efficiency drops below a threshold, the system transitions to the bypass mode, effectively adapting the charging parameters to maintain optimal 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 configuration significantly reduces charging time and heat generation, enhancing the efficiency and safety of non-contact power transmission by minimizing power loss and regulator heat, while maintaining a simple and compact device design.
Implementation Method 1
a power reception device of a non-contact power transmission system transmitting power from a power transmission device to the power reception device by electromagnetically coupling a primary coil and a secondary coil
Data Source
AI summary
A power reception device utilizing non-contact power transmission causes a PMOS transistor as a switch circuit to be turned ON when a secondary battery is in a heavy-load state to form a path which bypasses a series regulator (LDO) as a power supply circuit, and supplies a charging current to the secondary battery through the bypass path. An offset may be provided between ON/OFF control threshold values of the PMOS transistor. The series regulator (LDO) may be entirely or partially set in a non-operating state when forming the bypass path.