LDO Regulator Feedback Control for Output Overshoot Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional low-dropout (LDO) regulator circuits face issues with output voltage overshoot during loading transitions, which can cause damage to connected loads due to the use of pre-defined delays in injection circuits.
Innovation Solution
An LDO regulator circuit with a dynamically monitoring LDO control circuit that selectively inactivates the injection current by comparing the output voltage to a reference voltage, avoiding unnecessary injection and thus preventing overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pre-defined delays are used in injection circuits to maintain output voltage during loading transitions, then the output voltage stability is improved, but output voltage overshoot occurs which can damage connected loads
Solution Approach 1:
The patent implements a feedback mechanism where the injection circuit continuously monitors the output voltage level and dynamically adjusts the injection current accordingly. When the output voltage approaches or exceeds the reference voltage, the feedback signal automatically reduces or stops the injection current, preventing overshoot while maintaining stability during loading transitions.
Solution Approach 2:
The injection circuit transitions from using fixed pre-defined delays to a dynamic control mechanism that adapts to real-time output voltage conditions. The circuit dynamically modulates the injection current based on the actual voltage state, enabling responsive adjustment that prevents overshoot while maintaining stability during load transitions.
2Stability of the object's composition
If pre-defined delays are used in injection circuits, then voltage stability during transitions is improved, but flexibility in applications is reduced due to fixed timing
Solution Approach 1:
The injection circuit employs dynamic control that adapts to different application requirements by responding to real-time voltage conditions rather than following fixed timing sequences. This enables the same circuit to effectively handle various loading scenarios and application conditions without requiring reconfiguration or adjustment of predetermined delay parameters.
Solution Approach 2:
The circuit changes the control parameter from fixed time delay to dynamic voltage-based control. By using the output voltage level as the controlling parameter instead of predetermined time intervals, the circuit gains adaptability to different applications while maintaining voltage stability during transitions.
3Stability of the object's composition
If injection current is continuously provided during loading transitions, then output voltage stability is improved, but unnecessary injection occurs causing energy waste
Solution Approach 1:
The feedback mechanism monitors the output voltage and dynamically controls the injection current based on actual voltage needs. When the output voltage is already stable or approaching the reference level, the feedback signal automatically reduces or stops the injection current, preventing energy waste from unnecessary injection while maintaining voltage stability when needed.
Solution Approach 2:
Instead of continuously providing full injection current during entire loading transitions, the circuit applies partial or zero injection current when voltage stability is already achieved. This optimized action reduces energy consumption by providing injection current only to the extent necessary for maintaining voltage stability.
Data Source
AI summary
A voltage regulation circuit includes a voltage regulator that is configured to provide a stable output voltage based on an input voltage; and a control circuit, coupled to the voltage regulator, and configured to provide an injection current to maintain the stable output voltage in response to an enable signal provided at an input of the control circuit transitioning to a predetermined state and cease providing the injection current when the control circuit detects that a voltage level of the output voltage is higher than a pre-defined voltage level.