Electric valve, heat management assembly and air conditioning system
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Solution Overview
Problem
In refrigeration systems, electric valves face challenges with static electricity generation, which affects the performance and operation of electronic components, leading to electromagnetic compatibility issues.
Innovation Solution
The electric valve design includes a circuit board with a reference ground electrically connected to a metal portion, either directly or indirectly, to absorb low-frequency radiation, thereby reducing electromagnetic noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic components are installed on the circuit board for flow control, then flow control accuracy is improved, but electromagnetic compatibility deteriorates due to static electricity affecting the electronic components
Solution Approach 1:
The patent introduces a metal portion as an intermediary element between the circuit board and ground. This metal portion serves as a mediator that provides a dedicated low-impedance path for static electricity and electromagnetic interference to reach ground, protecting the electronic components without affecting the flow control accuracy
Solution Approach 2:
The patent applies local quality by creating a specific electromagnetic shielding structure around the circuit board area. The metal portion is strategically positioned and configured to provide localized electromagnetic compatibility protection exactly where the electronic components are vulnerable, without compromising the overall flow control function
2Reliability
If additional electromagnetic compatibility protection components are added to the circuit board, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the electromagnetic compatibility protection function with the existing structural components. The metal portion is integrated into the housing or mounting structure rather than being a separate added component, combining structural support with electromagnetic shielding functionality to avoid increasing device complexity
Solution Approach 2:
The metal portion utilizes the natural conductivity of metal and its inherent connection to ground through the housing structure to provide electromagnetic compatibility protection. The structure itself serves the dual purpose of mechanical support and electromagnetic shielding, eliminating the need for additional protection 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 enhances the electromagnetic compatibility of the electric valve by suppressing low-frequency radiation and reducing interference, improving overall system performance without the need for additional electromagnetic compatibility protection components.
Implementation Method 1
the reference ground of the circuit board is electrically connected directly or indirectly to the metal portion, which is equivalent to the reference ground being electrically connected to the ground. In this way, it is beneficial to releasing low-frequency radiation on the circuit board, thereby facilitating suppressing electromagnetic noise
Data Source
AI summary
Provided are an electric valve, a thermal management assembly, and an air conditioning system. The electric valve includes a valve body, a circuit board, and a sensor. The valve body has a passage, and the sensor is connected to the circuit board in at least one of an electric connection mode and a signal connection mode. The sensor is configured to detect at least one of a pressure or a temperature of a working medium in the passage. At least one of the valve body or a housing of the sensor includes a metal portion, and a reference ground of the circuit board is electrically connected directly or indirectly to the metal portion.