Serial Bus PSU Addressing Using Stepped Voltage Levels
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Solution Overview
Problem
In power distribution networks, assigning unique addresses to multiple power supply units (PSUs) without manual configuration or software updates is challenging, especially when PSUs are identical and require efficient communication over serial buses.
Innovation Solution
An automatic addressing process using a controller that sends a signal through a serial bus, where each PSU determines its address based on the voltage level, incrementing it for downstream units, and stores addresses in memory to persist across power losses, eliminating the need for manual dip switches or software updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual dip switches or software updates are used to assign addresses to PSUs, then unique addressing is achieved, but installation complexity and time increase
Solution Approach 1:
The PSU automatically assigns its own address by detecting the voltage level on the serial bus and incrementing it, eliminating the need for manual dip switch configuration or software updates. The system serves itself by using the voltage signal both for communication and for address assignment.
Solution Approach 2:
The address assignment is achieved by changing the voltage parameter of the signal on the serial bus. Each PSU detects the voltage level and uses it to determine its address, with the voltage being incremented for downstream devices. This transforms a manual configuration process into an automatic electrical parameter-based assignment.
2Measurement precision
If manual configuration methods are used for address assignment, then addressing accuracy is maintained, but installation time increases
Solution Approach 1:
The address assignment is performed automatically during the power-up sequence before normal operation begins. The controller sends a voltage signal that propagates through the serial bus, and each PSU captures its address from the voltage level at its position, completing the configuration before the system becomes operational.
Solution Approach 2:
The manual mechanical process of flipping dip switches is replaced by an electrical voltage-based automatic detection and assignment system. The controller uses voltage signals to automatically program each PSU's address, eliminating the need for physical manual configuration and significantly reducing installation time.
3Extent of automation
If voltage level detection is used for address assignment, then automation is achieved, but signal interference may occur
Solution Approach 1:
The serial bus serves multiple functions simultaneously: it provides both power/communication signals and carries the address assignment information through voltage levels. The same physical medium is used for both operational signals and configuration data, eliminating the need for separate address configuration hardware or software.
Solution Approach 2:
The voltage level on the serial bus acts as an intermediary that carries address information without requiring direct communication between the controller and each individual PSU. The voltage signal propagates through the bus and each PSU independently detects and captures its address from the voltage level at its position, avoiding direct signal interference issues.
Data Source
AI summary
An automatic addressing process for devices on a serial bus is disclosed. In one aspect, a controller is communicatively coupled to multiple power supply units (PSUs) over a serial bus. At installation (and may be at start up or reset), the controller sends a signal through the serial bus to a first PSU, which adopts a first address based on a voltage level of the signal and increases the voltage level before passing the signal to a second PSU. The second PSU adopts an address based on the increased voltage level, increments the voltage level of the signal and passes the signal down the bus. Adopted addresses are written to memory and stored in such a manner that power loss will not erase the address. This stepped voltage signal allows multiple identical PSUs to be addressed without reliance on manually-changed dip switches, separate address negotiation software, or the like.