Hybrid Active Droop Current Sharing Power Supply
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Solution Overview
Problem
Existing power systems with parallel-connected power supplies face challenges in achieving flexible current sharing between active and droop current sharing techniques, leading to increased power loss due to the need for redundant power supplies to ensure backup operation, which complicates system reliability and efficiency.
Innovation Solution
A power system design that incorporates both active and droop current sharing circuits, allowing for dynamic configuration based on load current set points, enabling flexible employment of either technique or their combination to achieve power redundancy without requiring additional redundant power supplies, thereby reducing power loss and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active current sharing technique is employed, then precise current balancing is achieved, but circuit complexity increases and response speed decreases
Solution Approach 1:
The patent implements a dynamic current sharing mechanism where the control mode switches between active current sharing and droop current sharing based on system conditions. The system dynamically adjusts the current sharing strategy to optimize performance while managing circuit complexity, allowing precise current balancing when needed while avoiding excessive complexity in normal operation.
2Device complexity
If droop current sharing technique is employed, then circuit simplicity and fast response are achieved, but current balancing precision deteriorates
Solution Approach 1:
The system dynamically selects between droop current sharing and active current sharing modes based on operational requirements. When fast response and circuit simplicity are prioritized, droop current sharing is used. When precise current balancing is critical, the system switches to active current sharing mode, thus dynamically optimizing the trade-off between simplicity and precision.
3Reliability
If redundant power supply is added for backup, then system reliability is improved, but power loss increases due to continuous operation
Solution Approach 1:
The patent prepares multiple power supplies in advance with the capability to provide backup support. Instead of keeping redundant supplies continuously operating, the system pre-configures them to能够快速接管负载 when needed. The current sharing circuits are pre-established so that when a power supply fails, the remaining units can immediately redistribute the load without requiring continuous operation of backup units, thus reducing power loss while maintaining reliability.
4Power
If multiple power supplies operate in parallel, then power capacity is increased, but current distribution control becomes complex
Solution Approach 1:
The patent implements a dynamic current distribution control system that automatically adjusts the operating mode based on the number of active power supplies and system conditions. When multiple supplies operate in parallel, the system dynamically selects between active current sharing and droop current sharing modes, and can further switch to unbalanced current sharing modes, optimizing the control complexity while maintaining high power capacity.
Data Source
AI summary
A power system with a combination of active current sharing and droop current sharing is disclosed. The power system includes a system load and plural power supplies connected with each other and connected to the system load. The power supplies are configured to respectively output a load current to the system load, and each power supply includes an active current sharing circuit and a droop current sharing circuit. The active current sharing circuit is configured to enter an operation or shutdown mode depending on whether the load current is higher than a first current set point. The droop current sharing circuit is configured to enter an operation or shutdown mode depending on whether the load current is higher than a second current set point. Hence, each power supply can respectively output an equal share of the load current by an active current sharing technique and/or a droop current sharing technique.