Digital Current Share Bus Interface for Power Module Load Balancing
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Solution Overview
Problem
In multi-module power systems, existing current share bus technologies face challenges in evenly distributing load current among parallel power modules, leading to uneven power dissipation and potential reliability issues due to temperature differences, which can cause inefficiencies and premature failure.
Innovation Solution
A digital current share bus interface is introduced, using a single wire for digital communication, where a digital controller processes current sense data into a digital word and adjusts the output current of each module to match the highest current provider, eliminating the need for voltage offsets and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external controller is used to sense and adjust each module's current output, then current distribution can be controlled, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling power modules to autonomously sense and adjust their own current output based on feedback from the current share bus, eliminating the need for external controllers. Each module independently monitors the bus voltage and modifies its output accordingly, achieving precise current distribution control while reducing system complexity.
Solution Approach 2:
The patent employs feedback mechanisms where each power module continuously monitors the voltage level on the current share bus, which reflects the output current of other modules. Based on this feedback, each module adjusts its own current output to achieve equal distribution, eliminating the need for complex external control systems.
2Adaptability or versatility
If analog voltage signals are used on the current share bus, then communication between modules is achieved, but susceptibility to noise and instability increases
Solution Approach 1:
The patent replaces the mechanical/analog voltage signal system with a digital communication protocol. Instead of using analog voltage levels to convey current information, the system uses digitally encoded messages transmitted over the current share bus, which significantly reduces noise susceptibility and improves reliability while maintaining full adaptability for inter-module communication.
3Stability of the object's composition
If voltage offsets are used to prevent hunting, then stability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent eliminates the need for voltage offsets by replacing the analog control mechanism with a digital communication protocol. The digital system directly compares current measurements and exchanges correction messages between modules, achieving both high measurement precision and system stability without the compromises inherent in analog offset-based approaches.
Solution Approach 2:
The patent implements precise feedback mechanisms where each module digitally communicates its current measurement and receives correction signals from other modules. This digital feedback loop maintains both high measurement precision and system stability by continuously adjusting outputs based on accurate real-time data without introducing offset errors.
Data Source
AI summary
A digital current share bus interface connects to a power module which provides a signal representative of its output current, and adjusts the module's output current in response to a control signal received from the interface. A data formatting module receives the output current signal and generates a digital word that varies with the current; the bits of the word are coupled to a current share bus. A comparator module receives digital words conveyed via the bus and generated by the data formatting module at respective inputs, and provides the control signal to the power module so as to adjust its output current to match the current value represented by the digital word on the bus. In a typical implementation, multiple power modules are coupled to the current share bus via respective interfaces, with the output currents of all the power modules connected in parallel.