Resistive Voltage Divider Phase Accuracy via Screening Terminal
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Solution Overview
Problem
Resistive voltage dividers with high voltage ratios suffer from phase errors due to mismatched resistance and capacitance ratios, which cannot be adequately corrected by compensation capacitors over varying temperature, humidity, and lifetime, leading to insufficient phase accuracy.
Innovation Solution
The placement of a screening part of the second contacting terminal between the first and third contacting terminals reduces parasitic capacitance, allowing for improved matching of resistance and capacitance ratios without additional compensation capacitors, and using the same resistive film material for all resistors ensures consistent accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If compensation capacitors are added to correct phase errors, then phase accuracy is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts and eliminates the parasitic capacitance C3 by removing the problematic third contacting terminal and its associated trace, thereby correcting phase errors without adding compensation capacitors. This approach simplifies the device structure while improving phase accuracy.
Solution Approach 2:
The patent introduces a shielding structure (grounded trace or contacting terminal) as an intermediary element between the first and third contacting terminals to reduce parasitic capacitance. This intermediary structure acts as a shield that mitigates the harmful capacitive coupling without requiring active compensation components.
2Measurement precision
If compensation capacitors are added to correct phase errors, then phase accuracy is improved, but manufacturing costs increase
Solution Approach 1:
The patent extracts and eliminates the parasitic capacitance C3 by removing the problematic third contacting terminal and its associated trace, thereby correcting phase errors without adding compensation capacitors. This approach simplifies the device structure while improving phase accuracy.
Solution Approach 2:
The patent uses a simple shielding structure (grounded trace) instead of expensive compensation capacitors. The shielding is implemented as a passive, inexpensive conductive element that provides phase error correction without the cost and complexity of active compensation components.
3Area of stationary object
If the third contacting terminal is placed close to the first contacting terminal, then device size is reduced, but parasitic capacitance increases and phase accuracy deteriorates
Solution Approach 1:
The patent extracts and eliminates the parasitic capacitance C3 by removing the problematic third contacting terminal and its associated trace, thereby correcting phase errors without adding compensation capacitors. This approach simplifies the device structure while improving phase accuracy.
Solution Approach 2:
The patent introduces a shielding structure (grounded trace or contacting terminal) as an intermediary element between the first and third contacting terminals to reduce parasitic capacitance. This intermediary structure acts as a shield that mitigates the harmful capacitive coupling without requiring active compensation components.
4Adaptability or versatility
If different resistive film materials are used for high and low ohmic resistors, then manufacturing flexibility is improved, but accuracy and stability deteriorate
Solution Approach 1:
The patent applies the same resistive film material for both the high ohmic resistor and the low ohmic resistor, ensuring homogeneous material properties throughout the device. This approach improves accuracy and stability by eliminating material-to-material variations, while still allowing manufacturing flexibility through consistent material deposition processes.
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 phase accuracy and maintains voltage ratio stability across temperature and lifetime changes, reducing manufacturing complexity and costs while ensuring consistent performance.
Implementation Method 1
a first parasitic capacitance occurs in parallel with the high ohmic resistor, i.e. between the first and the third contacting terminals
Data Source
AI summary
A resistive voltage divider includes a first resistor and a second resistor electrically connected in series. Each of the resistors is made of an electrically resistive film material and applied in the form of a trace onto an insulating substrate. The divider's voltage ratio has a value between one hundred and one million, where two ends of the trace of the second resistor overlap at least in part with a first and a second) contacting terminal, respectively, and two ends of the trace of the first resistor overlap at least in part with the first and third contacting terminal, respectively. In order to decrease the parasitic capacitance between the first contacting terminal and the third contacting terminal, the second contacting terminal is placed with at least a screening part between the first and the third contacting terminals.