Power Control Device Current Sharing Bus Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In switched-mode power converters with multiple paralleled power trains, accurately sharing current and determining the number of active power trains is challenging, leading to instability and undesired control responses due to asymmetries and differing parameter updates.
Innovation Solution
A power control device employs a synchronization signal on a synchronization node to initiate a time frame with time slots, allowing for digital current-sharing signals to be transmitted on a current-sharing bus node, synchronizing switching activity and enabling precise load current determination and control among power trains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple paralleled power trains are used to increase output power, then the output power capability is improved, but current sharing accuracy deteriorates due to asymmetries and difficulty in determining the number of active power trains
Solution Approach 1:
The patent introduces a current sharing bus that acts as an intermediary communication channel between paralleled power trains. Each power train communicates its operating status and current information through this bus, enabling accurate determination of the number of active power trains and precise current sharing without requiring complex direct sensing arrangements between all power train pairs.
Solution Approach 2:
The patent implements a feedback mechanism where each power train monitors the current sharing bus to detect signals from other power trains. This feedback allows each power train to determine how many other power trains are active and adjust its own current contribution accordingly, maintaining accurate current sharing despite variations in the number of active power trains.
2Adaptability or versatility
If the number of active power trains varies between full load and low load conditions, then adaptability is improved, but control stability deteriorates due to difficulty in handling information about active power train count
Solution Approach 1:
The patent enables each power train to autonomously determine the number of active power trains by monitoring signals on the current sharing bus. Each power train independently processes the information from the bus to update its control parameters, eliminating the need for complex centralized control logic and maintaining stability during transitions between different numbers of active power trains.
Solution Approach 2:
The patent establishes a predefined communication protocol on the current sharing bus that allows power trains to signal their active status before full load sharing begins. This preliminary signaling ensures that each power train has accurate information about the number of active counterparts before making control adjustments, preventing instability during load transitions.
3Measurement precision
If data exchange mechanisms are added to signal total load current to individual power trains, then current sharing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the current sharing communication function with the existing power train control architecture. The current sharing bus is integrated into the control circuitry of each power train, allowing data exchange to occur through existing control pathways rather than requiring completely separate communication infrastructure, thus minimizing the increase in device complexity.
Solution Approach 2:
The current sharing bus serves multiple functions: it signals the active status of power trains, communicates load current information, and enables coordination of current sharing. This multi-functionality reduces the need for separate dedicated circuits for each communication task, thereby limiting the increase in device complexity while achieving accurate current sharing.
Data Source
AI summary
An embodiment of the invention relates to a power control device configured to provide current-sharing control in a power converter including a plurality of power trains. The power control device transmits or receives a synchronization signal on a synchronization node to initiate a time frame that includes a plurality of time slots, and to control a switching activity of a power switch in a respective power train. The power control device further includes a current sharing bus node on which a digital current-sharing signal is transmitted in a designated time slot. The power control device determines a load current of the power converter and controls a power train current employing current data received on the current-sharing bus node from another power control device. The power control device may be a master power control device that transmits the synchronization signal on the synchronization node.