Adaptive logic board for variable speed drive
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Solution Overview
Problem
The complexity and cost of manufacturing multiple logic boards for variable speed drives (VSDs) in HVAC&R systems, each with different power output ranges, complicate production and increase costs due to the need for distinct internal components to handle varying current and voltage loads.
Innovation Solution
An adaptive logic board with a signal sensing circuit and a sensing unit that can determine the size of the VSD based on a power output range, using a harness to transmit identification codes and select appropriate internal components, allowing a single board to monitor and control multiple VSD sizes by adjusting resistor configurations and current transducers.
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 specific current and voltage loads, but manufacturing complexity and costs increase
Solution Approach 1:
The logic board is designed with multiple sets of internal components (resistors, current transducers, sensing circuits) that can be selectively activated based on the VSD size. A single logic board can serve multiple VSD power output ranges (e.g., 100-500 HP, 500-1000 HP, 1000-5000 HP) by dynamically configuring which components are active, eliminating the need for multiple dedicated logic boards for different VSD sizes.
Solution Approach 2:
The logic board incorporates dynamic component selection capability through switches or configurable circuitry that can activate or deactivate specific internal components based on detected VSD size. This dynamic reconfiguration allows the same hardware to adapt its characteristics to match different load requirements, resolving the contradiction between optimization and manufacturing complexity.
2Reliability
If multiple logic boards are manufactured for different VSD sizes, then each board can handle varying current and voltage loads, but manufacturing costs increase
Solution Approach 1:
By designing a universal logic board that can accommodate multiple VSD sizes through selective component activation, the system reduces the total number of unique logic board designs required. This consolidation decreases manufacturing setup costs, inventory complexity, and production line variations, directly addressing the cost increase issue while maintaining the ability to handle varying current and voltage loads.
Solution Approach 2:
Multiple sets of internal components (resistors, current transducers, sensing circuits) are integrated into a single logic board design rather than distributing them across multiple dedicated boards. This merging approach consolidates manufacturing processes and reduces the overall bill of materials complexity, thereby reducing manufacturing costs while preserving the capability to handle different load conditions.
3Ease of manufacture
If a single adaptive logic board is used for multiple VSD sizes, then production is simplified and costs are reduced, but the board must dynamically configure internal components
Solution Approach 1:
The logic board is pre-configured with multiple sets of internal components (resistors, current transducers, sensing circuits) during manufacturing, but their activation state is determined dynamically based on VSD size detection. This preliminary preparation of multiple component sets allows the board to adapt to different VSD sizes without requiring physical reconfiguration or manual intervention, simplifying production while enabling dynamic adaptation.
Solution Approach 2:
The logic board includes detection circuitry that identifies the VSD size (through harness-transmitted identification codes or electrical characteristics) and uses this feedback information to automatically configure the appropriate internal components. This feedback mechanism resolves the complexity of dynamic configuration by making it an automated response to detected conditions rather than a manual or complex control process.
4Reliability
If multiple logic boards are manufactured for different VSD sizes, then each board can be optimized for specific power output ranges, but production time and variety increase
Solution Approach 1:
A single logic board design can serve multiple VSD power output ranges by selectively activating appropriate internal components. This universality eliminates the need to produce multiple variants of logic boards for different power ranges (e.g., 100-500 HP, 500-1000 HP, 1000-5000 HP), thereby streamlining production processes and improving manufacturing productivity while maintaining optimized performance for each power range.
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, reduces costs, and enables a single adaptive logic board to effectively monitor and control various VSD sizes, improving operational efficiency and flexibility in HVAC&R systems.
Implementation Method 1
a sensing unit that is configured to measure a voltage drop of the input signal across an active resistor of the plurality of resistors
Data Source
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AI summary
The present disclosure relates to an adaptive logic board 100 that includes a signal sensing circuit 153 configured to receive an input signal as an electrical current. The signal sensing circuit 153 includes a plurality of resistors 154 and a plurality of switches 156 configured to electrically couple or electrically decouple the plurality of resistors 154 from the signal sensing circuit 153, in which each switch of the plurality of switches 156 corresponds to a corresponding resistor of the plurality of resistors 154. The adaptive logic board 100 also includes a sensing unit 180 that is configured to measure a voltage drop of the input signal across an active resistor of the plurality of resistors 154.