Programmable Discrete I/O 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, as existing modules are often specific to particular voltage ranges and types, such as 24V, 240V, AC, or DC.
Innovation Solution
A programmable discrete input/output module that includes pulse width modulation and demodulation modules, isolators, comparators, and digital filters, allowing for programmable references and hysteresis, enabling operation across various voltage levels and types, thereby replacing multiple modules with a single versatile unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dedicated input/output modules are used for different voltage levels, then interface compatibility with various instruments is improved, but device complexity and system cost increase
Solution Approach 1:
The patent implements a universal input/output module that can operate across multiple voltage levels (24V, 48V, 120V, 240V AC/DC) through programmable configuration. The module uses pulse width modulation (PWM) with configurable duty cycles to adapt to different voltage requirements, and includes programmable references and hysteresis to accommodate various instrument interfaces. This single multi-functional module replaces what would traditionally require multiple dedicated modules for each voltage level, thereby reducing device complexity while maintaining broad interface compatibility.
2Adaptability or versatility
If multiple dedicated input/output modules are used for different voltage levels, then interface compatibility with various instruments is improved, but operational cost increases
Solution Approach 1:
The patent merges the functionality of multiple dedicated input/output modules into a single integrated module. By combining voltage adaptation capabilities, programmable reference generation, hysteresis control, and isolation features into one unit, the system reduces the total number of modules required. The module can be programmed to handle different voltage levels and instrument interfaces, eliminating the need to deploy separate modules for each voltage level and thereby reducing operational costs associated with having multiple discrete components.
3Adaptability or versatility
If a programmable module operates across various voltage levels, then versatility is improved, but response time may be compromised
Solution Approach 1:
The patent implements preliminary configuration of PWM parameters, programmable references, and hysteresis values during system initialization or setup phases. By pre-configuring these parameters for different voltage levels and operating conditions, the module can switch between voltage modes rapidly without requiring complex real-time calculations. The isolation amplifier and PWM circuitry are pre-designed to handle various voltage ranges, enabling fast transitions between operating modes while maintaining versatility across different voltage levels.
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, reducing operational costs and complexity by allowing AC/DC response without significant time compromise, interfacing with components across 24V, 48V, 120V, or 240V, and both AC and DC voltages.
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
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.