Field Device Power Supply Prioritization for Stable Startup
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Solution Overview
Problem
Conventional positioners face issues with unstable operation due to inadequate primary power supply during slow changes in electric current from the higher-level system, leading to potential malfunctions such as unintended valve openings.
Innovation Solution
A field device with a primary power supply generating circuit that prioritizes the supply of operating power to the calculation processing portion, ensuring it starts up first and then sequentially directs power to other functional circuits, maintaining stability during startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the primary power supply generating circuit produces constant voltage from the supplied electric current, then the positioner can operate with the supplied current, but if the supplied electric current changes slowly during startup, the main circuit may start up with inadequate voltage causing erratic operation and malfunctions
Solution Approach 1:
The patent applies preliminary action by introducing a startup control circuit that detects startup conditions and sequentially controls the activation of circuit blocks. Before the main circuit operates, the startup control circuit first activates the A/D conversion circuit and other functional circuits in a predetermined sequence, ensuring they are fully initialized before normal operation begins. This prevents erratic operation during startup by ensuring proper sequencing of circuit activation.
2Productivity
If all functional circuits are activated simultaneously during startup, then the system can quickly become operational, but the calculation processing portion and other circuits may operate in an unstable state causing faults
Solution Approach 1:
The patent applies segmentation by dividing the startup process into distinct sequential stages. The startup control circuit separates the activation of different circuit blocks (A/D conversion circuit, calculation processing portion, other functional circuits) into a predetermined sequence rather than simultaneous activation. This segmentation allows each circuit to stabilize before the next is activated, ensuring startup stability while maintaining reasonable startup speed.
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
Prevents faults by ensuring the calculation processing and functional circuits start up correctly and stably, preventing erratic operations and malfunctions.
Implementation Method 1
a primary power supply generating circuit portion 4 that includes a zener diode D1. In this positioner 100, the primary power supply generating circuit portion 4 produces a constant voltage Vs from the supply electric current I from the higher-level system 200
Data Source
AI summary
A field device has a primary power supply generating circuit that generates a primary power supply from an electric current that is supplied through a pair of electric wires from a higher-level system, and a calculation processing portion and various functional circuit portions, which operate based on a supply of an operating power supply electric current produced from the primary power supply. The field device also has an operating power supply electric current supplying unit that supplies the operating power supply electric current to a calculation processing portion with maximum priority. The calculation processing portion receives the operating power supply electric current supplied with maximum priority, clears a self-reset operation after starting up itself, and then directs sequentially, following a predetermined sequence, supply of the operating power supply electric current to each of the various functional circuit portions.