Universal Automation Controller Input for Direct Thermistor Sensing
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Solution Overview
Problem
Traditional automation controllers are not compatible with thermistor signals, as they require a power source, necessitating an additional device for signal input, which is inefficient.
Innovation Solution
An automation controller system capable of receiving analog, digital, and thermistor inputs, using a processor to analyze thermistor resistance values through a look-up table or Steinhart-Hart equation, with a +10V regulated power terminal to provide a constant DC power source for thermistors, allowing direct input without additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional automation controllers are used with standard analog and digital inputs, then the controller structure remains simple and compatible with conventional devices, but thermistor signals cannot be directly input requiring additional intermediate devices
Solution Approach 1:
The automation controller is designed with a universal input interface that can accept multiple types of inputs (analog, digital, and thermistor) through the same physical terminal. The input module is configured to recognize and process different input types based on signal characteristics, eliminating the need for separate input paths for thermistors while maintaining backward compatibility with traditional analog and digital inputs.
Solution Approach 2:
An input module serves as an intermediary component between the thermistor and the controller's processing unit. This module provides the necessary power source for the thermistor and conditions the thermistor signal into a form suitable for the controller's analog-to-digital converter, thereby enabling direct thermistor input without external intermediate devices.
2Device complexity
If thermistor signals are input through additional intermediate devices, then the controller maintains its traditional simple structure, but the system requires more components and increases complexity
Solution Approach 1:
The functionality previously requiring separate intermediate devices (power supply for thermistor, signal conditioning, and input processing) is merged into a single integrated input module within the controller. This consolidation reduces the total component count and simplifies the system architecture while improving signal input efficiency through direct integration.
3Device complexity
If thermistor power is provided by external sources, then the controller input circuit remains simple, but the system requires additional devices and reduces operational efficiency
Solution Approach 1:
The input module incorporates an integrated power source that automatically provides the necessary power to thermistor inputs. The system self-configures to supply power through the same input terminal used for signal reception, eliminating the need for external power sources and enabling truly direct thermistor input operation.
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
Enables efficient and direct integration of thermistor signals into automation controllers, providing accurate temperature control and measurement without the need for intermediate devices, enhancing compatibility and operational efficiency.
Implementation Method 1
using a processor to analyze thermistor resistance values through a look-up table or Steinhart-Hart equation
Implementation Method 2
with a +10V regulated power terminal to provide a constant DC power source for thermistors
Data Source
Figure 1~2
Figure 3
AI summary
Components and devices are provided for controlling and monitoring a machine or process using an automation controller that may be capable of receiving inputs from a digital source, an analog source, or a thermistor source. In one embodiment, an automation controller may include first, second, and third input terminals. The first and second input terminals may receive input signals from analog and digital sensors, and the second and third terminals may receive input signals from a thermistor.