Phase Ethernet Communication for Parallel AC Power Supplies
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Solution Overview
Problem
Conventional master-slave communication systems for AC power supplies connected in parallel suffer from slow signal transmission speeds, complex wiring, and reduced reliability due to the use of serial data communication interfaces like RS-232 or RS-485, which impede immediate response and synchronous action between the master and slaves, affecting the output quality of AC power supplies.
Innovation Solution
A master-slave communication system utilizing network connection ports on phase communication control boards connected via network transmission cables, enabling faster signal transmission at speeds up to 10/100/1000 Mbps and forming a local area network, allowing immediate response and synchronous action between the master and slaves, thereby enhancing the output quality of AC power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If serial data communication interfaces (RS-232 or RS-485) or CANbus are used for master-slave communication, then the communication system can be established, but the signal transmission speed is slow (less than 1 Mbit)
Solution Approach 1:
The patent changes the communication interface from serial interfaces (RS-232/RS-485) or CANbus to Ethernet network interfaces, fundamentally altering the transmission speed parameter from sub-1 Mbit to 10/100/1000 Mbps, thereby resolving the speed limitation while maintaining communication reliability through standardized network protocols
2Ease of operation
If serial data communication interfaces are provided for master-slave communication, then communication control can be performed, but the wiring is complicated with many connection structures
Solution Approach 1:
The patent employs universal Ethernet network interfaces that can be used for both communication control and data transmission, replacing multiple specialized serial interfaces with a single standardized protocol, thereby simplifying wiring structures while improving transmission reliability through error correction and retransmission mechanisms inherent in Ethernet
3Productivity
If slaves are connected directly to the master in parallel, then the power system can be expanded, but the total length of communication transmission cable becomes too long
Solution Approach 1:
The patent transitions from a hierarchical master-slave connection structure to a distributed network topology where all units connect through Ethernet switches, changing the dimensional arrangement of communication paths. This allows power expansion while keeping communication cable lengths short and manageable, improving signal transmission reliability
Data Source
AI summary
A master-slave communication system for a single-phase to multi-phase AC power supply includes a master and a plurality of slaves that are connected in parallel and configured to supply single-phase to multi-phase AC power. The master includes a main communication control board and at least one phase communication control board. The main communication control board is in communication with the phase communication control board. The slaves each include at least one phase communication control board. The master and an adjacent one of the slaves as well as every adjacent two of the slaves are in communication with each other through a network transmission cable connected between the network connection ports of the same phase, thereby improving the communication transmission speed and reliability between the master and the slaves and further improving the output quality of the AC power supply.