Adjustable Current Limiting Circuit for Fast Boot and Short Protection
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Solution Overview
Problem
Conventional current limiting circuits in power management integrated chips have a fixed current limiting value, which can lead to failed boot-ups under heavy loads or damage due to short-circuited back-end loads during booting.
Innovation Solution
A current limiting circuit with an adjustable current limiting value, achieved through a current limiting module that controls the voltage difference between the control terminal and the input terminal of a transistor, allowing for dynamic adjustment of the current limiting value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small current limiting value is used, then components are protected from damage under short-circuit conditions, but the power management integrated chip cannot establish voltage within specified time under heavy-load
Solution Approach 1:
The patent implements dynamic current limiting by switching between different current limiting modules (first module with lower current limit for normal operation, second module with higher current limit for heavy-load conditions) based on system state, resolving the contradiction between component protection and booting speed
Solution Approach 2:
The patent changes the current limiting parameter dynamically by selecting different current limiting modules with different current limiting values based on operating conditions, allowing the system to adapt between protection mode and performance mode
2Productivity
If a large current limiting value is used, then booting-up speed improves under heavy-load, but components are damaged by long-term high current when back-end load is short-circuited
Solution Approach 1:
The system dynamically switches between current limiting modules based on operational needs, using high current limit during booting for speed and low current limit during normal operation for protection, thus resolving the contradiction
Solution Approach 2:
The patent segments the current limiting function into multiple independent modules (first current limiting module and second current limiting module) with different current limiting characteristics, allowing selective activation based on system state
Data Source
AI summary
A current limiting circuit includes a first voltage terminal, a second voltage terminal, a first transistor and a current limiting module. An input terminal of the first transistor is electrically connected to the first voltage terminal, and an output terminal of the first transistor is electrically connected to the second voltage terminal. The current limiting module is electrically connected to the input terminal of the first transistor and a control terminal of the first transistor. The current limiting module is configured to control voltage difference between the control terminal of the first transistor and the input terminal of the first transistor for controlling a state of the first transistor so that a current limiting value of the current limiting circuit is adjustable.