Programmable Discrete Input Module for Multi-Voltage Isolation
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Solution Overview
Problem
Industrial control systems require multiple dedicated input/output modules to interface with instruments operating at different voltage levels, leading to increased complexity and cost due to the need for specific modules for each voltage type.
Innovation Solution
A programmable discrete input/output module that includes a pulse width modulation and demodulation module, isolators, comparators, and a digital filter, allowing for programmable references and hysteresis, which can interface with components operating at various voltage levels (24V, 48V, 120V, 240V) and provide AC/DC responses, reducing the need for multiple modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dedicated input/output modules are used to interface with instruments at different voltage levels, then the system can handle various voltage types (24V, 48V, 120V, 240V), but the device complexity and cost increase
Solution Approach 1:
The patent implements a universal input module that can interface with instruments operating at multiple voltage levels (24V, 48V, 120V, 240V AC/DC) through a single device. The module contains voltage detection circuitry that automatically identifies the input voltage type and configures internal parameters accordingly, eliminating the need for multiple dedicated modules for different voltage types while maintaining full compatibility with various voltage standards
Solution Approach 2:
The module dynamically changes its internal operating parameters based on the detected voltage level. The voltage detection circuit measures the input voltage and automatically adjusts configuration parameters such as reference voltages, scaling factors, and protection thresholds to match the detected voltage type, enabling the same hardware to adapt to different voltage conditions without manual reconfiguration
2Reliability
If multiple dedicated input/output modules are used for different voltage levels, then each voltage type can be handled specifically, but the system cost increases
Solution Approach 1:
The patent implements a universal input module that can interface with instruments operating at multiple voltage levels (24V, 48V, 120V, 240V AC/DC) through a single device. The module contains voltage detection circuitry that automatically identifies the input voltage type and configures internal parameters accordingly, eliminating the need for multiple dedicated modules for different voltage types while maintaining full compatibility with various voltage standards
Solution Approach 2:
The patent combines the functionality of multiple dedicated input modules (designed for different voltage levels) into a single integrated module. By merging voltage detection, automatic parameter configuration, and multi-voltage interface capabilities into one device, the system reduces component count and overall cost while maintaining the reliability benefits of voltage-specific handling through software-based adaptation
3Device complexity
If a programmable module is used to interface with various voltage levels, then the number of modules is reduced, but the programming and configuration complexity increases
Solution Approach 1:
The module performs preliminary automatic voltage detection and parameter configuration upon power-up or when a new instrument is connected. The voltage detection circuit automatically measures the input voltage level and pre-configures internal parameters before the user needs to use the module, eliminating the need for manual programming of voltage-specific settings and reducing the operational burden on users
Solution Approach 2:
The module provides self-service by automatically detecting the voltage level and configuring its own operating parameters without requiring external programming. The system includes built-in voltage measurement circuitry and automatic parameter adjustment logic that enables the module to adapt to different voltage conditions autonomously, significantly reducing the programming complexity for end users
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
The programmable module provides functionality equivalent to multiple independent modules with a single card, offering flexibility and cost reduction by allowing AC/DC responses without significant time compromise, thus simplifying industrial control system operations.
Implementation Method 1
a pulse width modulation module configured to generate a pulse width modulated signal based upon an input signal
Implementation Method 2
An isolator is configured to isolate the pulse width modulation module and the pulse width demodulation module. The isolator generates an isolated modulated pulse width signal based upon the pulse width modulated signal
Implementation Method 3
a pulse width demodulation module configured to generate a demodulated pulse width signal based upon the isolated modulated pulse width signal
Implementation Method 4
A first comparator and a second comparator compare the demodulated pulse width signal with a respective programmable reference
Implementation Method 5
A digital filter filters a comparison signal output by the first comparator or the second comparator to generate a discrete input signal
Data Source
AI summary
A programmable discrete input module is described. In one or more implementations, the programmable discrete input module comprises a pulse width modulation module configured to generate a pulse width modulated signal based upon an input signal and a pulse width demodulation module configured to generate a demodulated pulse width signal. An isolator is configured to isolate the pulse width modulation module and the pulse width demodulation module and to generate isolated modulated pulse width signal based upon the pulse width modulated signal for the pulse width demodulation module to generate the demodulated pulse width signal. The programmable discrete input module also includes a first comparator and a second comparator for comparing the demodulated pulse width signal with a respective programmable reference and a digital filter configured to filter a comparison signal output by the first comparator or the second comparator to generate a discrete input signal.