Center Point Pre-Charging Circuit Topology
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems that connect multiple power networks using pre-charging resistors face inefficiencies, such as significant heat generation, cost and complexity increases, and ineffective current control due to exponential current determination, limiting their application to specific voltage levels and allowing variations in maximum pre-charging current.
Innovation Solution
The implementation of a common point pre-charging topology with passive or active pre-charging direction control using switched-mode power supplies or linear current sources, which limits current flow through switching elements like MOSFETs, reducing heat generation and component count by leveraging the current blocking characteristics of switching circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-charging resistors are used to limit inrush current between power networks, then current control is achieved, but significant heat generation occurs and system efficiency decreases
Solution Approach 1:
The patent introduces a pre-charging circuit with controllable switching elements (first and second switching elements) that act as intermediaries between the first and second power networks. These switching elements, controlled by control circuitry, regulate current flow during the pre-charging phase without the continuous resistive losses associated with traditional pre-charging resistors. The switching elements enable precise current limiting while minimizing energy dissipation as heat.
2Reliability
If traditional pre-charging circuits are used, then current limiting is achieved, but system complexity and cost increase
Solution Approach 1:
The patent designs the pre-charging circuit to be integrated within the existing power network connection architecture, where the switching elements and control circuitry serve multiple functions: pre-charging current limiting, normal operation switching, and potential reverse power flow management. This multi-functionality reduces the need for separate dedicated pre-charging components, thereby simplifying the overall system while maintaining effective current limiting capability.
3Stability of the object's composition
If pre-charging resistors are used to equalize voltage between networks, then voltage equalization is achieved, but resistive losses increase
Solution Approach 1:
The patent employs dynamically controllable switching elements that can adjust their state based on real-time voltage differential detection between the two power networks. The control circuitry monitors voltage levels and activates the pre-charging path only when voltage equalization is needed, then deactivates it once equalization is achieved. This dynamic operation eliminates continuous resistive losses while maintaining effective voltage equalization capability.
Data Source
AI summary
A device for connecting a first network comprising a first energy storage element and a second network comprising a second energy storage element includes switching circuitry and pre-charging circuitry. The switching circuitry is configured to electrically couple the first network and the second network. The switching circuitry comprises a first switching element configured to bi-directionally allow current between the first network and a center point node when operating in a closed state. The switching circuitry further comprises a second switching element configured to bi-directionally allow current between the second network and the center point node when operating in a closed state. The pre-charging circuitry is configured to limit current to the center point node when a first voltage at the first energy storage element equalizes with a second voltage at the second energy storage element.