Two-way AC Power Conversion Device Disconnection Detection
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Solution Overview
Problem
Traditional two-way AC power conversion devices often trigger protection mechanisms when a device under test is randomly disconnected, leading to damage and delayed restarts, as they struggle to immediately determine disconnection and manage voltage spikes.
Innovation Solution
A two-way AC power conversion device equipped with a phase-locked loop circuit and digital control module that detects abnormal amplitude variations in real-time voltage signals to prevent power input/output and avoid protection mechanism triggers, using threshold values to determine disconnection and adjust duty ratios to prevent voltage spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DUT is randomly disconnected from the output terminal, then the AC power conversion device cannot immediately determine the disconnection, but the output terminal may be subjected to abnormally high voltage
Solution Approach 1:
The patent applies preliminary action by continuously monitoring the amplitude component of the voltage signal before disconnection occurs. The control unit detects abnormal amplitude variations in real-time, allowing the system to identify disconnection events immediately rather than waiting for protection mechanisms to trigger after damage occurs. This proactive detection prevents the time loss associated with protection mechanism activation and enables immediate restart capability.
2Reliability
If the traditional AC power conversion device triggers the protection mechanism, then internal components are protected, but the device cannot resume work quickly even after DUT reconnection
Solution Approach 1:
The patent implements feedback by continuously monitoring the amplitude component of the voltage signal and using this information to control power input/output. When the amplitude component indicates normal operation, the system allows power flow; when abnormal variations are detected indicating disconnection, the system immediately stops power input/output without triggering protection mechanisms. This feedback loop enables both component protection and rapid resumption of work, as the system can quickly transition between states based on real-time amplitude monitoring.
3Ease of operation
If the AC power conversion device draws current from a disconnected output terminal, then the device attempts to operate, but abnormally high voltage damages internal components
Solution Approach 1:
The patent applies preliminary action by detecting abnormal amplitude variations in the voltage signal before the system attempts to draw current from a disconnected terminal. The control unit monitors the amplitude component continuously and identifies disconnection events through abnormal amplitude patterns. By detecting the disconnection condition beforehand, the system prevents current drawing from disconnected terminals and stops power input/output immediately, thereby avoiding voltage spikes and protecting internal components while maintaining operational safety.
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 immediate detection of device disconnection, preventing damage and allowing quick resumption of operations without triggering protection mechanisms, thus enhancing flexibility and safety.
Implementation Method 1
The phase-locked loop circuit is electrically connected to the power conversion module, and is used to detect the first AC power to be input or output and generate a real-time voltage signal. The real-time voltage signal has an amplitude component and an angular velocity component.
Data Source
AI summary
The present invention provides a two-way power conversion device comprising a power conversion module and a digital control module. The power conversion module sets a first AC power to be input or output according to a control signal. The digital control module comprises a phase-locked loop circuit and a control unit. The phase-locked loop circuit detects the first AC power to be input or output and generate a real-time voltage signal having an amplitude component and an angular velocity component. The control unit sets the control signal according to the amplitude components and at least one amplitude variation obtained in different switching cycles. Wherein the control unit calculates said at least one amplitude variation according to the amplitude components obtained in different switching cycles, and the power conversion module to stop inputting or outputting the first AC power when said at least one amplitude variation is abnormal.