Motorised Drive Device Electromagnetic Filtering for RF Antenna Interference
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Solution Overview
Problem
Motorized drive devices for screening devices face issues with reduced radiofrequency performance due to electromagnetic compatibility defects, specifically caused by unshielded electrical supply wires interfering with radiofrequency antennas, leading to decreased signal intensity and increased electromagnetic radiation.
Innovation Solution
Incorporation of an electromagnetic filter module with common mode inductors and a decoupling module with differential mode inductors to reduce electromagnetic coupling between radiofrequency antennas and electrical supply wires, maintaining radiofrequency performance while minimizing physical bulk and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unshielded power supply wires are used, then device complexity is reduced, but radiofrequency signal intensity decreases due to electromagnetic interference
Solution Approach 1:
The patent introduces an electromagnetic filter as an intermediary component between the unshielded power supply wires and the radiofrequency antenna. This filter acts as a mediator that allows the simplicity of unshielded wires to be maintained while blocking the harmful electromagnetic interference from reaching the antenna, thus preserving radiofrequency performance without adding shielding complexity to the wire assembly itself.
Solution Approach 2:
The patent extracts the electromagnetic filtering function from the wire shielding structure and places it in a separate dedicated filter component. This separation allows the power supply wires to remain unshielded and simple, while the filter handles the electromagnetic compatibility issue independently, resolving the contradiction between wire simplicity and signal integrity.
2Area of stationary object
If wired radiofrequency antenna is placed close to power supply wires, then space utilization is improved, but electromagnetic radiation increases
Solution Approach 1:
The patent converts the harmful electromagnetic radiation into a manageable filtering task. By placing the antenna close to the power wires (maintaining compact space) and introducing an electromagnetic filter, the harmful interference is captured and filtered rather than allowing it to radiate outward. The filter transforms the potential harm of close proximity into a localized filtering problem that can be solved without increasing overall electromagnetic radiation.
3Object-affected harmful factors
If common mode inductances are added to electronic control unit, then electromagnetic compatibility is improved, but radiofrequency signal intensity decreases due to coupling effects
Solution Approach 1:
The patent introduces a differential mode inductor as an intermediary component that specifically targets the coupling between common mode inductances and the radiofrequency antenna. This differential mode inductor acts as a mediator that blocks the harmful coupled signals while allowing the beneficial common mode filtering to function, thus resolving the contradiction between electromagnetic compatibility and signal intensity.
4Object-affected harmful factors
If shielded radiofrequency antenna is used, then electromagnetic interference is reduced, but physical bulk of torque support increases
Solution Approach 1:
The patent extracts the electromagnetic shielding function from the antenna structure itself and places it in a separate electromagnetic filter component. This allows the use of simple unshielded wire antennas without increasing the volume of the torque support, while the dedicated filter handles the electromagnetic interference protection independently.
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 solution effectively preserves radiofrequency performance by presenting high impedance to interfering currents, allowing unshielded radiofrequency antennas to operate effectively near electrical supply wires without degrading performance, and reduces electromagnetic radiation, thus enhancing the motorized drive device's efficiency and compatibility.
Implementation Method 1
an electromagnetic filtering module comprising common mode inductors, coupled together, each common mode inductor being electrically connected to one of the second electrical supply traces
Implementation Method 2
an electromagnetic decoupling module comprising differential mode inductors, each differential mode inductor being electrically connected to one of the second electrical supply traces
Data Source
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AI summary
A motorized drive device includes an electromechanical actuator (11), an electrical power supply device, a power supply cable (18), and an unshielded wire radio frequency antenna (58). The electronic control unit (15) includes a printed circuit board (46), a communication module (27), an electromagnetic filtering module, and an electromagnetic decoupling module. The antenna (58) extends through a torque support (21) of the actuator (11) and is electrically connected to a first electrical trace of the printed circuit board (46). Each of the power supply wires (Bat+, Bat-, SP1, SP2) of the cable (18) extends through the torque support (21) and is electrically connected to a second power supply trace of the printed circuit board (46).The filtering module comprises common-mode inductors coupled together, each electrically connected to one of the second electrical tracks. In addition, the decoupling module comprises differential-mode inductors, each electrically connected to one of the second electrical tracks.