Selective Protection Circuit for HVDC Power Supply Short Circuit Current
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Solution Overview
Problem
High short circuit currents in HVDC power supply systems can cause power outages in important communications devices due to increasing power supply voltages in data centers and communications equipment rooms.
Innovation Solution
A selective protection circuit with a current-limiting module and control module is implemented, which includes a switch unit and a unidirectional conduction unit, to detect and control excessive currents, switching off the switch unit when the current exceeds a preset threshold, thereby preventing power outages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power supply voltage is increased to meet higher power requirements, then power supply capability is improved, but short circuit current increases causing power outages
Solution Approach 1:
The patent implements preliminary protective action by detecting current abnormalities and issuing warnings before actual power outages occur. The control module monitors current in real-time and triggers protective measures proactively, preventing the worsening of reliability issues before they manifest as complete power failures.
Solution Approach 2:
The patent introduces a current detector and control module as intermediary components between the power supply and load. This intermediary system monitors current flow and mediates protective actions, allowing the system to maintain high voltage for power capability while preventing catastrophic failures through intermediate detection and control stages.
2Reliability
If current detection and protection mechanisms are added, then power supply reliability is improved, but device complexity increases
Solution Approach 1:
The control module serves multiple functions: it detects current abnormalities, issues warnings, and executes protective actions. By making the control module universal and multi-functional, the patent reduces the need for separate dedicated components for each function, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The patent merges the current detection, warning issuance, and protection execution functions into an integrated control system. By combining these functions that work together in the protection process, the system achieves improved reliability without proportionally increasing complexity, as shared components serve multiple purposes in the protection chain.
Data Source
AI summary
A selective protection circuit includes a current-limiting module and a control module, where the current-limiting module includes a switch unit, and the switch unit includes a first end, a second end, and a control end; the first end is connected to a positive electrode of a bus voltage of an HVDC power supply, and the second end is connected to a positive electrode of a power supply of a voltage pre-regulator circuit in a load branch connected to the current-limiting module; the control end is connected to the control module; and the control module is configured to output a control signal to the control end when a value of a total current flowing through the switch unit is greater than or equal to a preset threshold, so as to switch off the switch unit.