Power Converter Loop Coupling for Surge and Ringing Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power converters experience electromagnetic noise due to surges and ringing, which existing shielding methods fail to effectively suppress, especially when shield placement is inadequate, leading to increased costs and reduced miniaturization.
Innovation Solution
An electronic device with a primary loop circuit and a secondary loop circuit disposed at a predetermined distance, where the secondary loop circuit induces currents from the magnetic field of the primary loop circuit, reducing equivalent inductance and suppressing surges and ringing through magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield plate is provided around the power converter, then electromagnetic noise is suppressed, but device complexity and cost increase
Solution Approach 1:
The invention extracts the harmful electromagnetic noise generated by the primary loop circuit and directs it into a dedicated secondary loop circuit (shielding structure) that is electrically isolated from the main circuit. This separates the harmful electromagnetic energy from the functional circuit, allowing it to be contained and dissipated without affecting other components, thereby suppressing electromagnetic noise without adding complex shielding plates.
Solution Approach 2:
The secondary loop circuit acts as an intermediary structure that receives electromagnetic energy from the primary loop circuit through magnetic coupling. This intermediary loop provides a controlled path for electromagnetic energy, transforming it into a manageable form that can be dissipated through resistance, thus suppressing electromagnetic noise while maintaining simple device structure.
2Object-affected harmful factors
If the shield plate is disposed at an inappropriate location, then electromagnetic noise cannot be effectively suppressed, but if the entire power converter is covered, then cost increases and miniaturization becomes difficult
Solution Approach 1:
The invention applies electromagnetic shielding locally rather than globally by creating a secondary loop circuit that is specifically positioned to capture electromagnetic energy from the primary loop circuit. The shielding structure is implemented only where electromagnetic noise is generated and needs to be contained, using magnetic coupling between loops to provide targeted suppression without covering the entire power converter, thus enabling miniaturization while maintaining effectiveness.
3Productivity
If semiconductor element operations are switched periodically, then current direction changes are achieved, but surge and ringing occur causing electromagnetic noise
Solution Approach 1:
The invention converts the harmful surge and ringing electromagnetic energy generated during semiconductor element switching into a useful form by directing it into the secondary loop circuit. The magnetic coupling between primary and secondary loops transforms the harmful electromagnetic noise into controlled electromagnetic energy in the secondary loop, which can then be dissipated through resistance, thereby converting harm into a manageable energy pathway that suppresses electromagnetic noise while maintaining switching productivity.
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 electromagnetic noise by minimizing equivalent inductance and controlling impedance, thereby suppressing surges and ringing in power converters, while allowing for miniaturization and cost-effective design.
Implementation Method 1
a secondary loop circuit that is disposed to face the primary loop circuit at a predetermined distance, and causes an induced current generated by a magnetic field generated in the primary loop circuit to flow in a loop shape
Data Source
AI summary
An electronic device has a primary loop circuit that includes a main circuit causing a current to flow in a loop shape; and a secondary loop circuit that is disposed to face the primary loop circuit at a predetermined distance, and causes an induced current generated by a magnetic field generated in the primary loop circuit to flow in a loop shape.