Power Converter Noise Reduction via Capacitor-Housing Loop
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Solution Overview
Problem
Existing power converters face challenges in reducing radiated noise from transformers without increasing the number of components, as traditional solutions require additional components like shield plates.
Innovation Solution
A power converter design that incorporates a transformer serving as a choke coil with exposed windings and at least two capacitors connected to the housing, forming a loop circuit that absorbs radiated noise, thereby reducing noise emission without the need for additional shielding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield plate is used to reduce radiated noise from the transformer, then the radiated noise is effectively blocked, but the number of components increases
Solution Approach 1:
The patent merges the noise reduction function with existing components (capacitors and housing) to form a loop circuit. Instead of adding a separate shield plate, the capacitors and housing are electrically connected to create a functional integration that achieves noise filtering without increasing component count
Solution Approach 2:
The housing is given multiple functions: it serves as both the structural enclosure and as part of the noise filtering loop circuit through its conductive portion. The capacitors also serve dual purposes in the circuit while contributing to noise reduction, making existing components multi-functional
2Object-affected harmful factors
If additional shielding components are added to reduce radiated noise, then noise protection is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines noise reduction functionality with existing structural and electrical components. The conductive housing and capacitors are integrated into a loop circuit that provides shielding, eliminating the need for separate manufacturing steps and assembly operations for additional shielding components
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 effectively absorbs radiated noise emitted from the transformer, preventing it from affecting internal components and external devices, while minimizing the number of components required, thus reducing noise interference without increasing the component count.
Implementation Method 1
Passage of the radiated noise emitted from the transformer through the internal region of the loop circuit will induce a current flowing through the loop circuit, which can cause the radiated noise to be absorbed by the loop circuit
Implementation Method 2
at least two capacitors accommodated in the housing and electrically connected to the conductive portion of the housing
Data Source
AI summary
A power converter for converting an input voltage into a predetermined voltage. The power converter includes a housing including a conductive portion. At least two capacitors are electrically connected to the conductive portion. A transformer, which is configured to serve as a choke coil, includes a winding and a core surrounding the winding with a portion of the winding being exposed from the core. The winding includes a lead that is led out from the exposed portion of the winding to the exterior of the transformer. The at least two capacitors, the lead, and the conductive portion of the housing form a loop circuit together. At least part of the exposed portion of the winding overlaps an internal region of the loop circuit, in a front view of the transformer as seen from a direction in which the lead is led out from the exposed portion of the winding.