Refrigerant Radiator EMI Closed-Loop to Reduce Filter Component Cost
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Solution Overview
Problem
Household appliances face challenges in reducing electromagnetic interference (EMI) from refrigerant radiators, which complicates electromagnetic compatibility (EMC) testing and increases production costs due to the need for additional components like common mode inductors and magnetic rings.
Innovation Solution
A system comprising a filter unit with a capacitor and inductor connected in series, or a resistor, inductor, and capacitor in series or parallel, connected to a metal conductor and the drive circuit, forming a closed-loop to reduce EMI, utilizing existing refrigerant radiators and drive circuits with reduced need for common mode 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 electromagnetic interference is reduced, but production cost increases
Solution Approach 1:
The patent extracts and eliminates the need for common mode inductors and magnetic rings by using the refrigerant radiator's metal housing itself as the shielding structure. The metal housing is designed with specific structural features (grounding connections, shielding partitions) that provide EMI protection without requiring additional filtering components, thereby reducing production cost while maintaining EMI suppression effectiveness.
Solution Approach 2:
The patent makes the refrigerant radiator's metal housing serve multiple functions: it acts as both the heat dissipation structure and the electromagnetic shielding enclosure. By integrating the shielding function into the existing metal housing structure, the patent eliminates the need for separate EMI filtering components, reducing both cost and complexity while maintaining protective functionality.
2Object-affected harmful factors
If multiple magnetic rings are used to reduce electromagnetic interference, then electromagnetic interference is suppressed, but installation process becomes complicated and production efficiency decreases
Solution Approach 1:
The patent removes the requirement for multiple magnetic rings and their complex installation process. Instead, the metal housing's inherent shielding properties and grounding structure provide EMI protection, eliminating the need for additional filtering components and simplifying the assembly process to improve production efficiency.
Solution Approach 2:
The patent combines the EMI shielding function with the refrigerant radiator's metal housing structure. The housing itself is designed to provide electromagnetic protection through its grounding connections and shielding partitions, merging the shielding function into the existing structure rather than requiring separate components, thereby simplifying installation and improving productivity.
3Object-affected harmful factors
If filter components are added to suppress electromagnetic interference, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent makes the metal housing serve dual purposes: as the structural enclosure for the refrigerant radiator and as the electromagnetic shielding barrier. The housing's grounding connections and internal shielding partitions provide EMI protection without requiring additional filter components, thereby reducing device complexity while maintaining protective functionality.
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, simplifies installation, and lowers production costs by forming closed-loops of low impedance, enabling easier EMC testing and improving production efficiency.
Implementation Method 1
a closed-loop of electromagnetic interference is formed among the refrigerant radiator, the metal conductor, the filter unit, and the drive circuit
Implementation Method 2
the filter unit includes a capacitor and an inductor connected in series
Implementation Method 3
the filter unit includes a capacitor and an inductor connected in series
Implementation Method 4
the metal conductor is respectively connected to the filter unit and the refrigerant radiator
Data Source
Figure 1~2
Figure 3~7
Figure 8~10
AI summary
A system for inhibiting the electromagnetic interference of a refrigerant radiator and a household appliance, the system comprising: a refrigerant radiator (1), a drive circuit (2) corresponding to the refrigerant radiator (1), a metal conductor (3) and a filter unit (4); the metal conductor (3) is separately connected to the filter unit (4) and the refrigerant radiator (1), the filter unit (4) is connected to the drive circuit (2), and an electromagnetic interference closed-loop circuit is formed between the refrigerant radiator (1), the metal conductor (3), the filter unit (4) and the drive circuit (2) corresponding to the refrigerant radiator (1). The described system for inhibiting electromagnetic interference of a refrigerant radiator and the household appliance may reduce the amount of electromagnetic interference of the refrigerant radiator, and lower production costs of the household appliance.