Contactless Power Driver Mode Switching for Heat Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing contactless power transmission systems face challenges in balancing the degree of positional freedom and heat generation, as switching between full-bridge and half-bridge drive modes based on the potential of the power receiving side's high potential power supply line is not effectively addressed, leading to either excessive power transmission or heat generation.
Innovation Solution
A control device that includes a power transmission driver and a power supply voltage control circuit, capable of switching between full-bridge and half-bridge drive modes based on rectified voltage information, to optimize power transmission and reduce heat generation by adjusting the power supply voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the primary coil is driven with a full-bridge configuration, then the degree of positional freedom increases, but when the secondary coil comes close to the primary coil, excessive power is transmitted and excessive heat is generated
Solution Approach 1:
The patent implements dynamic switching between full-bridge and half-bridge drive modes based on the detected distance between primary and secondary coils. When the coils are far apart, full-bridge mode provides high power transmission and positional freedom. When the coils come close, the system automatically switches to half-bridge mode to reduce power transmission and prevent excessive heat generation, thus dynamically adapting to changing conditions.
Solution Approach 2:
The patent changes the drive mode parameter (full-bridge vs. half-bridge) based on the distance between coils. This parameter change allows the system to optimize power transmission efficiency and prevent overheating by selecting the appropriate drive mode according to the actual coupling condition between the coils.
2Temperature
If the primary coil is driven with a half-bridge configuration, then excessive heat generation is suppressed, but the degree of positional freedom decreases
Solution Approach 1:
The system dynamically selects between half-bridge and full-bridge modes based on real-time distance detection. Half-bridge mode is activated when coils are close to suppress heat generation, while full-bridge mode is used when coils are far apart to maintain positional freedom, thus dynamically balancing thermal management and operational flexibility.
Solution Approach 2:
The drive mode parameter is changed based on the coupling condition between coils. When the coupling is strong (coils close), the system switches to half-bridge mode to limit power transmission and reduce heat. When coupling is weak (coils far), full-bridge mode is used to maximize power transmission capability, thus adapting the parameter to the actual operating condition.
3Power
If a method of switching drive modes based on the potential of the power receiving side high potential power supply line is used, then power transmission can be controlled, but improvement of the degree of positional freedom and suppression of excessive heat generation cannot be achieved at the same time
Solution Approach 1:
The patent uses feedback from the rectified voltage information to determine the distance between coils and switch between drive modes. The rectified voltage serves as a feedback signal that indicates the coupling condition, enabling the system to automatically adjust the drive mode to optimize both power transmission control and heat generation suppression while maintaining positional freedom.
Solution Approach 2:
The system changes the drive mode parameter based on the rectified voltage feedback. When the rectified voltage indicates strong coupling (coils close), the system switches to half-bridge mode to suppress heat generation. When the rectified voltage indicates weak coupling (coils far), full-bridge mode is used to maintain positional freedom, thus achieving both power control and thermal management simultaneously.
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 enables improved positional freedom and reduced heat generation by dynamically switching between drive modes based on rectified voltage, ensuring appropriate power transmission and stable operation in contactless power transmission systems.
Implementation Method 1
contactless power transmission in which electromagnetic induction is used to make power transmission possible without a metal contact
Implementation Method 2
a rectifier circuit that is connected to the secondary coil and generates a rectified voltage
Data Source
AI summary
A control device controls a power transmission driver that transmits power to a power receiving device including a rectifier circuit that is connected to a secondary coil and generates a rectified voltage, by outputting a drive signal to a primary coil. The control device switches the drive mode of the power transmission driver between a full-bridge drive mode and a half-bridge drive mode according to the rectified voltage.