Load Control Valve Short Circuit Detection via Voltage Sampling
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Solution Overview
Problem
Existing load control systems face challenges in accurately diagnosing short circuits in current control valves, which can lead to latent malfunctions and prevent emergency shutdowns, especially when combined with other malfunctions, compromising safety.
Innovation Solution
A control device with a processor and sampling device that gradually opens the first current control valve to determine if the input voltage increases, using a comparator to detect short circuits and generate a warning signal, allowing for early detection and potential shutdown of the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first current control valve is kept closed for safety, then the load can be shut off in case of malfunction, but the short circuit in the first current control valve can only be detected in special operating states
Solution Approach 1:
The system performs preliminary diagnostic actions by gradually opening the first current control valve during operation to check for short circuits. The processor controls the first current control valve to open to a first degree and measures the input voltage to detect potential short circuits before they become critical failures.
Solution Approach 2:
The system implements feedback by continuously monitoring the input voltage through the sampling device while the first current control valve is gradually opened. The processor uses this feedback signal to determine whether a short circuit is present, enabling real-time detection without compromising the safety function.
2Difficulty of detecting and measuring
If the first current control valve is gradually opened to detect short circuits, then detection capability is improved, but the load may be affected by voltage changes
Solution Approach 1:
The first current control valve is opened only to a first degree (partially) rather than fully opened, which is sufficient to detect short circuits through voltage measurement while minimizing the impact on load operation. The second current control valve compensates to maintain stable load operation.
Solution Approach 2:
The second current control valve acts as an intermediary to compensate for the partial opening of the first current control valve. By adjusting the second current control valve, the system maintains stable current flow through the load while the first valve performs diagnostic functions.
3Difficulty of detecting and measuring
If the short circuit detection is performed during normal operation, then diagnostic capability is improved, but the system complexity increases
Solution Approach 1:
The first current control valve serves multiple functions: it acts as a safety shutdown valve when closed and as a diagnostic element when gradually opened to detect short circuits. The sampling device and processor are used for both normal control operations and diagnostic measurements, reducing the need for separate dedicated components.
Solution Approach 2:
The diagnostic function is merged with the normal control operation by using the existing current control valves and processing unit. The gradual opening and voltage measurement are integrated into the existing control logic, combining safety, control, and diagnostics in a unified system.
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
Enables reliable detection of short circuits during operation, ensuring the load can be safely shut off and preventing critical states by identifying potential issues before they become critical.
Implementation Method 1
a sampling device for determining an input voltage through the first current control valve
Implementation Method 2
The processor is configured to determine the presence of a short circuit between the first port and the first potential if the input voltage does not increase when the first current control valve is gradually opened
Data Source
AI summary
The disclosure relates to a control device for controlling a load, wherein the control device comprises the following elements: a first current control valve between a first port of the load and a first potential of an operating voltage; a second current control valve between a second port of the load and a second potential of the operating voltage; a processor configured to actuate the second current control valve when the first current control valve is closed, in order to control a current through the load; and a sampling device for determining an input voltage through the first current control valve, wherein the processor is configured to determine the presence of a short circuit between the first port and the first potential if the input voltage does not increase when the first current control valve is opened gradually.