Parallel Power Supply Synchronization via Mutual Communication
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Solution Overview
Problem
Existing power supply systems with multiple devices connected in parallel to a common load face instability in current output due to independent operation, requiring external control devices for synchronization, which increases costs and complexity, and may lead to safety issues during transient load changes like those in arc welding.
Innovation Solution
A power supply system where each device includes a control information calculation unit, control unit, and communication units to synchronize voltage or current output, allowing devices to communicate and adjust their outputs based on detected current and voltage information, ensuring stable and synchronized operation without an external control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power supply devices are connected in parallel to a common load, then large current can be supplied to the load, but the current output becomes unstable due to independent operation of each device
Solution Approach 1:
Multiple power supply devices are merged into a coordinated system through mutual communication and synchronization. Each device shares control information and current detection data with others, allowing them to operate as a unified system rather than independent units, thereby maintaining stable current output while providing large current capability.
Solution Approach 2:
A feedback mechanism is implemented where each power supply device detects its own current output and shares this information with other devices. The control information calculation unit uses received current information from other devices to adjust control signals, creating a closed-loop feedback system that stabilizes the total current output to the load.
2Reliability
If an external control device is introduced to monitor and correct the operation of power supply devices, then current output stability can be improved, but the equipment cost increases
Solution Approach 1:
The power supply devices perform self-control through mutual communication. Each device is equipped with control information calculation units and communication interfaces that enable them to autonomously adjust their operation based on information from other devices, eliminating the need for an external control device and reducing system cost while maintaining stability.
Solution Approach 2:
Each power supply device is designed with multi-functional capabilities, including current detection, communication, and control information calculation. This universal design allows each device to contribute to the overall control function, replacing the need for a separate external control device and reducing overall system complexity.
3Device complexity
If power supply devices operate independently to maintain simple device structure, then device complexity is reduced, but current output stability deteriorates during transient load changes
Solution Approach 1:
The control function is segmented and distributed across multiple power supply devices rather than centralized in one device. Each device has its own control information calculation unit that independently processes control information and generates control signals, maintaining device simplicity while achieving coordinated operation through segmentation of the control function.
Data Source
AI summary
A power supply system includes multiple power supply devices including a first power supply device and a second power supply device that are connected in common to a load. The first power supply device calculates control information for controlling voltage or current to be output to the load and source information for obtaining the control information, and controls the output to the load based on the calculated control information while transmitting the source information to the second power supply device. The second power supply device receives the source information transmitted from the first power supply device, calculates control information based on the received source information, and controls the output to the load while detecting current to be output from itself to the load and transmitting current information to the first power supply device.