Split E-Fuse System for High-Power Path Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-power electronic systems with multiple paths, placing a single electronic fuse results in increased impedance and power losses due to longer path lengths, while using separate fuses for each path leads to design complexity and expense, and coordination issues between fuses can cause improper current distribution.
Innovation Solution
A split electronic fuse system where two high-power paths are controlled by a single controller, with current sense resistors placed remotely and coupled to a summing resistor to provide a scaled sense voltage, allowing for simultaneous control of switching elements and reducing path lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electronic fuse is used to control multiple high-power paths, then device complexity is reduced, but path length increases leading to higher impedance and power losses
Solution Approach 1:
The single electronic fuse is segmented into multiple independent fuse units, with each unit controlling a specific high-power path. This segmentation allows each fuse to be placed close to its controlled path, minimizing path length and reducing power losses, while maintaining simplified control architecture through modular design
Solution Approach 2:
The fuse control architecture transitions from a centralized single-point control to a distributed multi-point control arrangement. By placing fuse units at different spatial locations along different power paths, the system achieves both reduced path lengths and coordinated control through a hierarchical structure
2Loss of energy
If separate electronic fuses are used for each high-power path, then power losses are reduced due to shorter path lengths, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple fuse units are merged under a single controller that coordinates their operation. The controller integrates the control functions for all fuse units, providing unified overcurrent protection and coordinated current distribution across multiple paths, thereby reducing control complexity while maintaining the benefits of distributed fuse placement
Solution Approach 2:
The single controller is designed to universally manage multiple fuse units through standardized interfaces and control algorithms. It performs multiple functions including individual fuse control, coordinated current balancing, and system-wide overcurrent protection, reducing the need for separate control circuits for each fuse
3Length of moving object
If separate electronic fuses are used for each high-power path, then path length is reduced, but coordination issues arise causing improper current distribution
Solution Approach 1:
The controller implements feedback mechanisms that monitor current distribution across multiple paths and dynamically adjust fuse unit operations. This feedback control ensures proper current sharing, prevents improper current distribution, and maintains reliable operation even as load conditions change
Solution Approach 2:
The fuse control system transitions from static independent control to dynamic coordinated control. The controller continuously adjusts the operation of multiple fuse units based on real-time system conditions, enabling adaptive current distribution that maintains reliability while benefiting from reduced path lengths
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces power losses by shortening high-power paths and eliminates the need for dual power planes, providing coordinated control of current while maintaining system safety and reducing manufacturing complexity and cost.
Implementation Method 1
current sense resistors placed remotely and coupled to a summing resistor to provide a scaled sense voltage
Data Source
AI summary
An electronic fuse system includes plural current paths, each operable to be coupled between a power source and a load, and each including a switching element and a current sensing resistor in series with the path such that the path passes current when the switching element is turned on and does not pass current when the switching element is turned off. A controller has two sense inputs and a control output. The control output is coupled to the switching elements in each of the plural current paths and is operable to turn them all on or off simultaneously responsive at least in part to the sense inputs. A summing resistor is connected across the two sense inputs, and coupling circuitry is operable to couple voltages appearing across the current sensing resistors to the summing resistor.