Two-Conductor Field Device Power Budgeting for Supplemental Modules
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Solution Overview
Problem
Existing two-conductor field devices face challenges in efficiently activating supplemental functionalities due to power limitations, where available power is dependent on terminal voltage and electrical current, and rapid changes in current values affect power availability.
Innovation Solution
A method for operating a two-conductor field device that involves setting a minimum electrical current value, measuring the maximum voltage value, and determining the minimum supplemental power available. This power is then used to activate supplemental modules when sufficient power is available, ensuring that basic and supplemental functionalities can be maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circuit for rapid monitoring of input power is provided to ensure basic and supplemental functionalities, then supplemental functionalities can be activated when sufficient power is available, but the system load and hardware requirements increase
Solution Approach 1:
The patent applies preliminary action by determining the minimum supplemental power available during an initializing phase before measurement operation begins. The processing unit calculates the available power budget based on terminal voltage and current measurements taken during initialization, storing this power information for later use. This allows supplemental functionalities to be activated or deactivated based on pre-calculated power availability without requiring continuous rapid monitoring during operation, thereby reducing system load and hardware requirements while maintaining the ability to adapt functionality based on power conditions
2Speed
If the electrical current value changes rapidly as a function of measured process variable, then the field device can respond to process changes, but the available power becomes difficult to monitor and manage
Solution Approach 1:
The patent resolves this contradiction by performing power determination in advance during the initializing phase, before measurement operation begins. The processing unit calculates the minimum supplemental power available based on terminal voltage and current measurements taken during initialization. This pre-calculated power information remains valid throughout measurement operation even as current values change rapidly in response to process variables, allowing the system to maintain both rapid response capability and reliable power monitoring without requiring continuous power recalculation
Solution Approach 2:
The patent applies dynamics by distinguishing between the static power budget determined during initialization and the dynamic current changes that occur during measurement operation. The system accepts that the power budget is established at initialization and remains relatively stable, while allowing current to vary dynamically in response to process variables. This separation allows the system to handle both static power management and dynamic process response effectively
Data Source
AI summary
A method for operating an automation field device comprises connecting a two-conductor line with an input terminal of the field device; setting a minimum electrical current value at the input terminal of the field device in an initializing phase; measuring a maximum voltage value at the input terminal in the initializing phase; ascertaining a minimum supplemental power supplied to the field device at the input terminal and which is available to the field device for performing at least one supplemental functionality; and activating/switching on a supplemental module by the processing unit when the ascertained minimum supplemental power is greater than or equal to an operating power needed for operating the supplemental module, wherein by the activating/switching on of the supplemental module a corresponding supplemental functionality is performed by the field device in measurement operation.