Fill Level Radar Potential Separation for Signal Integrity
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Solution Overview
Problem
Existing fill level radar systems face challenges in achieving effective electrical isolation between the two-wire loop and the output circuit, particularly with high microwave frequencies, leading to signal attenuation and interference, and requiring high effort due to the unsuitability of simple optocouplers for analog DC voltage signals.
Innovation Solution
The implementation of potential isolation within the electronics unit, utilizing digital or AC voltage signal connections for separation, and incorporating inductive or capacitive isolation within the power supply to separate different functional areas, including the power supply, thereby reducing the complexity of signal separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If potential separation is arranged outside the electronics unit between the two-wire loop and the output circuit, then electrical isolation is achieved, but the effort for signal transmission through the isolation barrier becomes relatively high
Solution Approach 1:
The electronics unit is divided into two separate areas by the potential separation: a first area containing the input and output circuit, and a second area containing the transmission signal generation. This segmentation allows each area to operate independently with its own potential reference, achieving electrical isolation while simplifying signal transmission within each area.
Solution Approach 2:
The potential separation acts as an intermediary barrier between the two-wire loop and the output circuit, enabling electrical isolation while allowing controlled signal transmission. The separation point serves as a mediator that blocks harmful potentials while permitting necessary signal passage through appropriate coupling methods.
2Device complexity
If simple optocouplers are used for potential separation, then device complexity is reduced, but they are unsuitable for transmitting analog DC voltage signals with exact amplitude values
Solution Approach 1:
The invention changes the parameter domain of signal transmission by using digital signals or AC voltage signals instead of analog DC voltage signals across the isolation barrier. This parameter change allows the use of simpler isolation components like optocouplers while maintaining the required signal transmission fidelity through modulation and demodulation processes.
3Reliability
If potential separation is implemented in the microwave path, then electrical isolation is achieved, but signal attenuation and reflections occur due to mismatching
Solution Approach 1:
The potential separation is extracted from the microwave path and relocated to the electronics unit, specifically positioned to separate the input and output circuit from the transmission signal generation area. This extraction removes the source of microwave signal mismatching and attenuation while preserving the essential electrical isolation function at the lower frequency electronics level.
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 approach enables reliable and efficient separation of digital or AC signals, reducing the effort required for signal isolation and ensuring continuous electrical isolation within the electronics unit, thus improving the accuracy and safety of fill level measurements while minimizing signal interference.
Implementation Method 1
incorporating inductive or capacitive isolation within the power supply to separate different functional areas
Implementation Method 2
incorporating inductive or capacitive isolation within the power supply to separate different functional areas
Implementation Method 3
In addition to an antenna for transmitting or receiving radar or microwaves
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
Signal transmission quality can be adversely affected both on potential separation in the microwave path and direct potential separation between the two-core loop and the output circuit. In one embodiment of the present invention, a fill level radar with potential separation within the electronic unit is disclosed, wherein the potential separation does not separate analogue signals but rather digital signals or DC-free alternating signals. The separating line runs, for example, through digital signal connections or AC signal connections. The complexity of signal separation can thus be reduced and the transmission quality increased.