Adaptive logic board for variable speed drive
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Solution Overview
Problem
The complexity and cost of manufacturing multiple logic boards for various sizes of variable speed drives (VSDs) in HVAC&R systems, due to differing power output ranges, complicate production and increase assembly costs.
Innovation Solution
An adaptive logic board that determines the size of the VSD based on a power output range, using a signal sensing circuit with resistors and switches to adjust electrical signals, allowing a single board to monitor and control multiple VSD sizes by selecting appropriate internal components based on an identification code or harness structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple logic boards are manufactured for different VSD sizes, then each board can be optimized for its specific power output range, but manufacturing complexity and assembly costs increase
Solution Approach 1:
The logic board is designed with multiple resistors (R1-R4) and switches (S1-S4) that can be configured through different resistance combinations to accommodate multiple VSD sizes (25HP, 50HP, 100HP, 200HP). This universal design allows a single logic board to replace multiple specialized boards, reducing manufacturing complexity while maintaining optimized performance for each power output range.
Solution Approach 2:
The logic board uses different resistor values (e.g., 100Ω, 200Ω, 500Ω, 1kΩ) and switch configurations to change the electrical parameters of the signal sensing circuit. By adjusting the resistance combinations through switches S1-S4, the same logic board can adapt to different current ranges corresponding to different VSD power outputs, eliminating the need for multiple specialized boards.
2Reliability
If multiple logic boards are manufactured for different VSD sizes, then each board can be optimized for its specific power output range, but assembly costs increase
Solution Approach 1:
The logic board is designed with multiple resistors (R1-R4) and switches (S1-S4) that can be configured through different resistance combinations to accommodate multiple VSD sizes (25HP, 50HP, 100HP, 200HP). This universal design allows a single logic board to replace multiple specialized boards, reducing manufacturing complexity while maintaining optimized performance for each power output range.
3Device complexity
If a single adaptive logic board is used for multiple VSD sizes, then production is simplified and assembly costs are reduced, but the board must handle varying power output ranges
Solution Approach 1:
The logic board uses different resistor values (e.g., 100Ω, 200Ω, 500Ω, 1kΩ) and switch configurations to change the electrical parameters of the signal sensing circuit. By adjusting the resistance combinations through switches S1-S4, the same logic board can adapt to different current ranges corresponding to different VSD power outputs, eliminating the need for multiple specialized boards.
Solution Approach 2:
The logic board incorporates switches (S1-S4) that can dynamically reconfigure the resistance network based on the VSD size. This dynamic configuration allows the board to adapt its signal sensing characteristics to match the specific power output range of the connected VSD, enabling a single board design to handle varying power requirements effectively.
4Ease of manufacture
If a single adaptive logic board is used for multiple VSD sizes, then assembly costs are reduced, but the board requires multiple resistors and switches for configuration
Solution Approach 1:
The logic board divides the signal sensing circuit into multiple segments, each with its own resistor (R1-R4) and switch (S1-S4). This segmentation allows independent configuration of each resistance element, enabling flexible adaptation to different VSD sizes while maintaining a modular structure that simplifies manufacturing and assembly.
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 simplifies production and reduces assembly costs by enabling a single adaptive logic board to monitor and control multiple VSD sizes, facilitating efficient operation across a wide range of power outputs.
Implementation Method 1
a sensing unit configured to measure a voltage drop of the input signal across an active resistor of the plurality of resistors
Data Source
AI summary
The present disclosure relates to an adaptive logic board that includes a signal sensing circuit configured to receive an input signal as an electrical current. The signal sensing circuit includes a plurality of resistors and a plurality of switches configured to electrically couple or electrically decouple the plurality of resistors from the signal sensing circuit, in which each switch of the plurality of switches corresponds to a corresponding resistor of the plurality of resistors. The adaptive logic board also includes a sensing unit that is configured to measure a voltage drop of the input signal across an active resistor of the plurality of resistors.