Electronic Fuse Soft-Start Control for Load Reinsertion Surges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During the use of electronic fuses, the reinsertion of a load connected to the electronic fuse after being unplugged may result in abnormal operation due to high current generation.
Innovation Solution
A control method for an electronic fuse that includes a first power switch and a soft start circuit, where if the connection between the load and the power output terminal is disconnected, the first power switch is turned off, and upon reconnection, it is controlled to turn on in a soft-start manner through the soft start circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the first power switch is turned on immediately upon load reconnection, then the power supply responds quickly to restore power, but high current surges occur causing abnormal operation
Solution Approach 1:
The control circuit detects load disconnection in advance and turns off the power switch before reconnection occurs. When the load is reconnected, the soft-start circuit gradually increases the power switch conduction, preventing high current surges while ensuring stable operation.
Solution Approach 2:
The soft-start circuit acts as a cushioning mechanism that limits the inrush current when the load is reconnected. By controlling the power switch to conduct gradually through the soft-start circuit, it prevents the harmful high current surge that would otherwise occur during immediate reconnection.
2Duration of action of stationary object
If the power switch remains on continuously, then power supply is maintained, but high current occurs when load is reconnected causing abnormal operation
Solution Approach 1:
The control circuit detects load disconnection in advance and turns off the power switch. Upon detecting load reconnection, it enables the soft-start circuit to gradually increase conduction, preventing high current surges while restoring power supply.
Solution Approach 2:
The soft-start circuit provides beforehand cushioning by limiting the inrush current during load reconnection. It controls the power switch to conduct gradually, preventing the harmful high current surge that would occur with immediate full conduction.
3Reliability
If the power switch is turned off upon load disconnection and soft-start is applied upon reconnection, then operation stability is improved, but system complexity increases
Solution Approach 1:
The control circuit integrates multiple functions: detecting load disconnection, controlling power switch turn-off, detecting load reconnection, and enabling soft-start conduction. This multi-functional integration manages the complexity while achieving stable operation.
Solution Approach 2:
The control circuit uses feedback from load status detection to dynamically control the power switch. It detects when the load is disconnected or reconnected and adjusts the power switch conduction accordingly, including enabling soft-start mode when appropriate, thereby managing complexity through intelligent control.
Data Source
AI summary
The electronic fuse includes a first power switch having two non-control terminals. A first non-control terminal of the first power switch is connected to a power input terminal and a second non-control terminal of the first power switch is connected to a power output terminal. The control method for controlling the electronic fuse includes when the power input terminal is connected to an input power source, the power output terminal is connected to a load, and the first power switch is conducting, if it is determined that a connection between the load and the power output terminal is disconnected, controlling the first power switch to turn off, and after controlling the first power switch to turn off, if it is determined that the connection between the load and the power output terminal is established, controlling the first power switch to conduct in a soft start manner through a soft start circuit.