Measurement Transducer Feed Device Current Regulation
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Solution Overview
Problem
Measurement transducer feed devices experience significant power loss due to the need for low pass filters and current limitation, resulting in reduced electrical energy availability for measurement transducers, especially when using the HART communication system.
Innovation Solution
A measurement transducer feed device with a high-impedance current regulation module connected in series with the power tap and measurement transducer, minimizing the impact of large capacitances and eliminating the need for low pass filters, thereby optimizing energy delivery to the measurement transducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low pass filter is connected in series to the measurement transducer to provide high impedance for HART communication, then the HART communication function is enabled, but the filter consumes electrical energy and reduces power available to the measurement transducer
Solution Approach 1:
The patent extracts and removes the low pass filter from the circuit configuration. Instead of connecting the filter in series with the measurement transducer, the invention uses the inherent high impedance of the current regulation module to provide the necessary impedance for HART communication without requiring a separate filter component, thereby eliminating the energy consumption associated with the filter.
Solution Approach 2:
The current regulation module is designed to serve multiple functions: it regulates the current for the measurement transducer and simultaneously provides the high impedance necessary for HART communication. This multi-functionality eliminates the need for a separate low pass filter, resolving the contradiction between enabling HART communication and maintaining power availability.
2Reliability
If current limitation is applied to protect the measurement transducer, then the transducer is protected from overcurrent damage, but the available electrical power for the transducer is reduced
Solution Approach 1:
The patent employs a dynamic current regulation approach where the current limitation is not fixed but adapts based on the operational state. The control unit continuously monitors and adjusts the current limit, allowing the system to provide maximum power when safe and reduce current only when necessary for protection, thereby optimizing the balance between protection and power availability.
3Stability of the object's composition
If a linear regulator is used to supply power to the measurement transducer, then the transducer receives stable voltage, but the regulator consumes energy and acts as a low pass filter that reduces available power
Solution Approach 1:
The patent replaces the linear regulator (analog/mechanical voltage regulation system) with a switching power supply or efficient voltage regulation circuitry. This substitution maintains voltage stability for the measurement transducer while dramatically reducing energy consumption, as switching regulators are inherently more efficient than linear regulators that dissipate excess voltage as heat.
Data Source
AI summary
The invention relates to a measurement transducer feed device for process automation technology that is configured for the energy supply of a measurement transducer and for forwarding measurement signals of the measurement transducer to a control unit, wherein the measurement transducer feed device has at least two connecting contacts that are configured for coupling the measurement transducer feed device to the control unit, with a current loop being formed between the two connecting contacts, and with the current loop comprising a power tap that is configured to supply the measurement transducer with electrical energy. The measurement transducer feed device is characterized in that the current loop comprises a current regulation module that is connected or connectable in series to the power tap and to the measurement transducer.