Wireless Power-Feeding Apparatus Dead Time Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a lack of effective techniques for achieving high power conversion efficiency in wireless power-feeding apparatuses, particularly when using compound semiconductors, and for reducing conduction and switching losses in high-frequency power electronics, which are crucial for smaller and lighter electronic devices.
Innovation Solution
A wireless power-feeding apparatus is designed with an electromagnetic coupling circuit, a power-transmission-side alternating-current voltage generating circuit, and a switching control circuit that uses compound semiconductor transistors with optimized dead time management and resonance mechanisms to reduce losses and enhance efficiency, incorporating air-core coils for efficient electromagnetic resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional switching control techniques are used in high-frequency power electronics, then the switching power supply circuit can operate, but the power conversion efficiency is low and conduction loss and switching loss are high
Solution Approach 1:
The patent applies parameter changes by optimizing the dead time of switching elements based on their specific on/off characteristics. By adjusting the dead time parameter to match the actual switching behavior of each element, the circuit achieves minimal conduction loss and switching loss, thereby maximizing power conversion efficiency in high-frequency operation.
Solution Approach 2:
The patent implements feedback mechanisms to monitor and adjust switching element performance in real-time. By measuring actual switching characteristics and feeding this information back to the control system, the dead time can be dynamically optimized to reduce losses and improve efficiency under varying operating conditions.
2Weight of moving object
If the apparatus size is reduced for smaller electronic devices, then portability improves, but heat dissipation becomes more difficult and efficiency decreases
Solution Approach 1:
The patent uses parameter changes to optimize switching frequency and dead time, enabling the circuit to achieve high power conversion efficiency in a compact form factor. By precisely controlling switching parameters, the system minimizes energy loss and heat generation while maintaining small size and light weight.
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 significantly reduces conduction and switching losses, increases power transmission efficiency, and miniaturizes the apparatus by leveraging the characteristics of compound semiconductors and electromagnetic resonance, while also improving electromagnetic compatibility and reducing heat generation.
Implementation Method 1
a power transmission coil on the power-transmission-unit side and a power reception coil on the power-receiving-unit side
Implementation Method 2
magnetic field coupling occurring using a mutual inductance occurring between the power transmission coil and the power reception coil
Implementation Method 3
magnetic field coupling occurring using a mutual inductance occurring between the power transmission coil and the power reception coil
Implementation Method 4
electric field coupling occurring using mutual capacitances
Implementation Method 5
an electromagnetic resonance circuit in which magnetic field coupling or electric field coupling is mixed
Data Source
AI summary
A switching control circuit alternately turns on/off, at a switching frequency at which the impedance of a multi-resonant circuit becomes inductive, switching elements with a dead time therebetween. In an operation in the third quadrant of current-voltage characteristics of the switching elements, the switching elements are turned on by supplying a control signal to control terminals of the switching elements, and a dead time is determined so as to satisfy tc≦td<(tc+ta), tc representing a commutation period in which the voltages across both ends of the switching circuits change, ta representing a period corresponding to the operation in the third quadrant, and td representing the dead time.