Power Converter Shutdown via Combined Voltage Current Thresholds
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Solution Overview
Problem
Power converters often fail to effectively manage situations where the output voltage falls below a setpoint and the output current exceeds a threshold, leading to potential damage or unsafe conditions, as existing protection mechanisms are inadequate in addressing these combined conditions.
Innovation Solution
A power system with a control circuit that monitors output voltage and current, shutting down the power converter when the voltage is below a defined threshold and the current is above a defined threshold for a specified period, and includes mechanisms for restarting and alarm activation to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protection mechanisms are used, then simple voltage or current protection is provided, but combined voltage and current threshold protection is inadequate
Solution Approach 1:
The control circuit combines monitoring of both voltage and current thresholds into a single integrated protection mechanism. The system simultaneously evaluates voltage threshold violations and current threshold violations, and only shuts down when both conditions are met, merging multiple protection functions into one coordinated system that improves reliability without proportionally increasing complexity.
Solution Approach 2:
The control circuit is designed to perform multiple functions: monitoring voltage, monitoring current, comparing both against thresholds, timing the duration of violations, and coordinating shutdown decisions. This multi-functional approach allows a single control circuit to provide comprehensive protection against combined voltage-current fault conditions that simpler circuits cannot address.
2Reliability
If shutdown is triggered immediately when thresholds are exceeded, then rapid protection is achieved, but false shutdowns may occur due to transient conditions
Solution Approach 1:
The control circuit implements a timing mechanism that monitors how long voltage and current thresholds are violated before triggering shutdown. By requiring the threshold violations to persist for a predetermined time period, the system performs a preliminary verification that filters out transient or momentary anomalies, ensuring that shutdowns occur only for sustained fault conditions rather than temporary fluctuations.
3Measurement precision
If comprehensive monitoring of voltage and current is implemented, then accurate fault detection is achieved, but system complexity increases
Solution Approach 1:
The control circuit focuses monitoring efforts on specific critical thresholds rather than continuously analyzing the full range of voltage and current values. By defining specific voltage threshold and current threshold levels relevant to the particular application, the system achieves accurate fault detection for critical conditions while avoiding the complexity of comprehensive continuous analysis across all possible parameter values.
Data Source
AI summary
A power system for powering a load including a power converter and a control circuit coupled to the power converter. The power converter includes an input terminal for receiving an input voltage and an input current, and output terminal for outputting an output voltage and an output current to a load. The control circuit is configured to monitor the output voltage and the output current of the power converter and shut down the power converter in response to the output voltage being less than or equal to a defined voltage threshold and the output current being greater than or equal to a defined current threshold for a defined period of time. Other example power systems, control circuits, and methods of controlling power converters are also disclosed.