Refrigerant Radiator EMI Suppression Using Closed-Loop Filter Circuit
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Solution Overview
Problem
Current methods for suppressing electromagnetic interference (EMI) in household appliances using refrigerant radiators are inefficient, leading to high production costs and complex installation processes, as they require numerous common mode inductors and magnetic rings to pass EMC tests.
Innovation Solution
A system comprising a refrigerant radiator, a metal conductor, and a filter unit connected to a drive circuit forms a closed-loop to reduce EMI, utilizing components like capacitors, inductors, and resistors in series or parallel configurations to effectively suppress electromagnetic interference, thereby reducing the need for additional inductors and magnetic rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If common mode inductors and magnetic rings are added to suppress electromagnetic interference, then the electromagnetic interference is reduced, but the production cost increases
Solution Approach 1:
The patent introduces a refrigerant radiator as an intermediary component that serves dual functions: heat dissipation for power components and electromagnetic interference suppression. The refrigerant radiator acts as a mediator between power components and the electromagnetic environment, providing EMI suppression without requiring additional dedicated EMI components like common mode inductors or magnetic rings, thereby reducing production cost while maintaining EMI reduction effectiveness.
2Object-affected harmful factors
If multiple magnetic rings are used to reduce electromagnetic interference, then the electromagnetic interference is suppressed, but the installation process becomes complicated
Solution Approach 1:
The patent merges the heat dissipation function and electromagnetic interference suppression function into a single integrated refrigerant radiator system. By combining these two functions that were previously handled by separate components (heat dissipation via cooling systems and EMI suppression via multiple magnetic rings), the installation process is simplified while achieving both heat dissipation and EMI suppression objectives simultaneously.
3Object-affected harmful factors
If numerous magnetic rings and filter components are added, then electromagnetic interference is reduced, but production efficiency decreases
Solution Approach 1:
The refrigerant radiator is designed to perform multiple functions simultaneously: it serves as a heat dissipation device for power components and as an electromagnetic interference suppression component. This multi-functionality eliminates the need for separate EMI suppression components, reducing the total number of parts that need to be installed and assembled, thereby improving production efficiency while maintaining effective EMI suppression.
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 system effectively reduces electromagnetic interference in refrigerant radiators, simplifies the installation process, and lowers production costs by creating a closed-loop of low impedance EMI suppression, allowing household appliances to pass EMC tests more easily.
Implementation Method 1
The electromagnetic interference generated by the power components during operations will be coupled to the refrigerant radiator
Data Source
AI summary
A system for suppressing the electromagnetic interference of a refrigerant radiator and a household appliance, the system including: a refrigerant radiator, a drive circuit corresponding to the refrigerant radiator, a metal conductor and a filter unit; the metal conductor is separately connected to the filter unit and the refrigerant radiator, the filter unit is connected to the drive circuit, and an electromagnetic interference closed-loop circuit is formed between the refrigerant radiator, the metal conductor, the filter unit and the drive circuit corresponding to the refrigerant radiator.