Parallel Power Supply Overcurrent Recovery via Load-Share Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power supplies in parallel configurations experience synchronization issues during hiccup mode recovery from overcurrent protection events, leading to prolonged startup times due to unsynchronized power supply states, causing repetitive overcurrent conditions.
Innovation Solution
Incorporating voltage regulation circuitry, a load-share controller, and overcurrent protection circuitry that adjusts regulated voltage based on a load-share voltage signal, selectively decoupling and recoupling power to the load when the current exceeds a threshold, and synchronizing power supply states by immediately recoupling when the LSV signal indicates another supply is driving the load current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supplies enter hiccup mode to protect against overcurrent conditions, then overcurrent protection is achieved, but power supply synchronization is lost and startup time is prolonged
Solution Approach 1:
The system uses load-share voltage signals as feedback to monitor the operational state of parallel power supplies. When one supply enters hiccup mode and decouples, the feedback signal indicates the load is being carried by other supplies, triggering immediate recoupling of the protected supply without waiting for predetermined time delays, thus maintaining synchronization and reducing startup time while preserving overcurrent protection capability
Solution Approach 2:
The power supply system dynamically adjusts its coupling state based on real-time load conditions. Instead of fixed time delays in hiccup mode, the system transitions between coupled and decoupled states dynamically responsive to load-share signals, allowing rapid adaptation to changing operational conditions and maintaining overall system stability without prolonged startup delays
2Reliability
If power supplies use predetermined debounce time before recoupling in hiccup mode, then overcurrent protection is maintained, but repetitive overcurrent conditions occur due to unsynchronized recoupling
Solution Approach 1:
The system continuously monitors load-share voltage signals to detect when other parallel power supplies are carrying the load current. This feedback mechanism enables synchronized recoupling of protected supplies with the rest of the system, preventing the repetitive overcurrent conditions that arise from unsynchronized operation while maintaining overcurrent protection through selective, coordinated recoupling
Solution Approach 2:
Before recoupling power supplies after hiccup mode, the system performs preliminary detection of load conditions through load-share signals. This preliminary action ensures that recoupling occurs only when appropriate and in synchronization with other supplies, preventing repetitive overcurrent events while maintaining protection functionality
Data Source
AI summary
A power supply comprises voltage regulation circuitry, a load-share controller, and overcurrent protection circuitry. The voltage regulation circuitry is configured to output a regulated voltage. The load-share controller is configured to control the voltage regulation circuitry to adjust the regulated voltage responsive to a load-share voltage signal (LSV) that indicates an amount of load current being delivered to a load. The overcurrent protection circuitry is configured to selectively couple the regulated voltage to the load. When the load current exceeds a threshold current, the overcurrent protection circuitry is configured to decouple the regulated voltage from the load. While the regulated voltage is decoupled from the load, and when the LSV signal indicates that load current is being delivered to the load by a different power supply, the overcurrent protection circuitry is configured to recouple the regulated voltage to the load.