Controllable Current Source Circuit for Diagnostic Compatibility
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Solution Overview
Problem
Conventional diagnostic systems often fail to establish compatibility with complex field devices or interface devices, leading to the deactivation of safety measures in control systems, as existing voltage influencing systems are limited in their ability to adjust voltage responses within the expected ranges for various tests, resulting in erroneous error signals and limited compatibility with different diagnostic systems.
Innovation Solution
A circuit arrangement featuring a controllable current source and electronic analyzing and controlling means that identifies test signals and adjusts the output voltage to be within the expected range, using a microcontroller to configure criteria for controlling the current source based on measured voltage and current changes, allowing for variable influence on the output voltage and current to distinguish between different test signals and avoid error signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage influencing system with a low-impedance load is used to establish compatibility with diagnostic systems, then compatibility is achieved for specific static tests, but energy losses increase significantly when the field device is switched on
Solution Approach 1:
The patent applies the dynamics principle by replacing the static low-impedance load with a controllable current source that can dynamically adjust its output based on the operational state. The current source is controlled to provide low impedance during diagnostic testing (switched-off state of field device) and high impedance during normal operation (switched-on state of field device), thus resolving the contradiction between compatibility and energy loss.
Solution Approach 2:
The patent implements parameter changes by varying the impedance characteristic of the voltage influencing system based on operational conditions. The controllable current source changes its output parameters (current magnitude and impedance) depending on whether the field device is in test mode or operational mode, allowing the system to optimize for either compatibility or energy efficiency as needed.
2Adaptability or versatility
If the impedance of the load in the voltage influencing system is reduced to establish compatibility, then compatibility with diagnostic systems improving, but the resistance value cannot be arbitrarily low due to energy losses
Solution Approach 1:
The patent applies the dynamics principle by replacing the static low-impedance load with a controllable current source that can dynamically adjust its output based on the operational state. The current source is controlled to provide low impedance during diagnostic testing (switched-off state of field device) and high impedance during normal operation (switched-on state of field device), thus resolving the contradiction between compatibility and energy loss.
Solution Approach 2:
The patent implements parameter changes by varying the impedance characteristic of the voltage influencing system based on operational conditions. The controllable current source changes its output parameters (current magnitude and impedance) depending on whether the field device is in test mode or operational mode, allowing the system to optimize for either compatibility or energy efficiency as needed.
3Reliability
If conventional diagnostic systems are used with complex field devices, then safety measures can be maintained, but compatibility is limited and erroneous error signals are generated
Solution Approach 1:
The patent applies the intermediary principle by introducing a controllable current source as a mediator between the diagnostic system and the complex field device. This intermediary component translates the test signals from the diagnostic system into appropriate voltage responses that mimic the behavior of simple field devices, enabling the diagnostic system to correctly identify compatible devices while maintaining safety measures.
Solution Approach 2:
The patent implements parameter changes by varying the impedance characteristic of the voltage influencing system based on operational conditions. The controllable current source changes its output parameters (current magnitude and impedance) depending on whether the field device is in test mode or operational mode, allowing the system to optimize for either compatibility or energy efficiency as needed.
4Device complexity
If a fixed voltage influencing system is used, then circuit simplicity is maintained, but the ability to adjust voltage responses for different test signals is limited
Solution Approach 1:
The patent applies the self-service principle by enabling the voltage influencing system to automatically adapt its output based on the detected test signal characteristics. The electronic analyzing and controlling means identify the type of test signal being applied and automatically adjust the controllable current source parameters accordingly, eliminating the need for manual configuration and reducing overall system complexity.
Solution Approach 2:
The patent implements feedback by using electronic analyzing and controlling means to monitor the test signal characteristics and automatically adjust the controllable current source output. This closed-loop control system detects the test signal type and adjusts the voltage response parameters accordingly, providing adaptability without requiring complex manual configuration.
Data Source
AI summary
The invention relates to a circuit arrangement for establishing compatibility between a field device or an interface device for a field device and a diagnostic system pertaining to a control system, to the output of which the interface device or field device can be connected. The diagnostic system is adapted to send, via the output of the control system, a test signal to the interface device or field device and to emit an error signal when an electrical response at the output of the control system lies outside an expectancy range. The circuit arrangement comprises voltage influencing means for influencing a voltage at the output of the control system. The circuit arrangement is characterized in that the voltage influencing means comprises a controllable power source with which power source a current can be produced for influencing a voltage at the output of the control system, that electronic analyzing and controlling means are present to identify a test signal at the output of the control system, that the analyzing and controlling means are adapted, on identification of a test signal, to instruct the controllable power source to adjust a target voltage at the output of the control system, which target voltage is to be within the expectancy range. Additionally, the invention relates to a corresponding method for establishing compatibility.