Potentiometer Segmented Resistance Paths for Dual Range Control
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Solution Overview
Problem
Conventional potentiometers used as voltage dividers lack the necessary accuracy and reproducibility for defining both a main control range and a special function range, often requiring additional connections and increased costs, while also missing clear logic levels for optimal evaluation.
Innovation Solution
A potentiometer with two locally separate resistance paths connected in series, where one path forms the main adjustment area and the other forms the special function area, utilizing a wiper contact to differentiate between the two ranges through a control unit and electronic evaluation, allowing for accurate and unambiguous assignment of special functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a potentiometer is used as a voltage divider with a single resistance track, then clear logic levels are available for evaluation, but accuracy and reproducibility are insufficient when defining both main control range and special function range
Solution Approach 1:
The resistance track is divided into two locally separate resistance paths (first resistance path and second resistance path) that are internally connected in series. The first resistance path forms the main adjustment area for specifying a main function, while the second resistance path forms the special function area for specifying at least one special function. This segmentation allows accurate differentiation between main control range and special function range without requiring additional external connections or complex circuitry.
2Measurement precision
If a potentiometer with two separate resistance paths is used to achieve greater accuracy, then accuracy and reproducibility improve, but the number of connections increases to four
Solution Approach 1:
The two resistance paths are internally connected in series within the potentiometer body, merging the functionality of what would traditionally require four separate connections into a three-connection device. The internal series connection eliminates the need for an additional external connection while maintaining the ability to accurately define both main control range and special function range.
3Reliability
If the wiper position is set far from the end position to allow clear differentiation, then clear logic levels are maintained, but the resulting voltage is subject to tolerances and aging influences
Solution Approach 1:
By segmenting the resistance track into two separate paths, the patent enables accurate voltage measurement at the transition point between ranges without requiring the wiper to be positioned far from the end. The segmented structure provides clear differentiation between main control range and special function range while maintaining voltage accuracy through the controlled transition at the resistance track connection point.
4Device complexity
If a single resistance track is used for both main control and special function, then device simplicity is maintained, but unambiguous assignment of special functions is lost
Solution Approach 1:
The resistance track is segmented into two distinct paths that are internally connected in series, creating clearly defined main adjustment area and special function area. This segmentation ensures unambiguous assignment of special functions to specific resistance path transitions while maintaining device simplicity through internal integration rather than external additions.
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 design achieves greater accuracy and expanded functionality with minimized circuitry and costs, enabling absolute position setting and time/memory settings in a single device, suitable for applications like blind or roller shutter control, with clear differentiation between main and special function ranges.
Implementation Method 1
potentiometers or trimmers are often used as voltage dividers for this purpose, which requires the presence of three connections on the potentiometer
Data Source
Figure 1~4
Figure 2~3
Figure 5~6
AI summary
The potentiometer (1) has resistor paths (RA-E1, RA-E2) with a common connection point forming a resistor-starting position (A) and a connection of the potentiometer. An end of one resistor path forms a resistor-end position (E1) and another connection of the potentiometer. An end of another resistor path forms an open, resistor-end position (E2). A main adjusting area and a special function area contact by a slider contact (S) forming a third connection of the potentiometer. The resistor paths are divided into resistor branches (Ra-Rd) in a sliding position.