Adaptive Gain Linear Regulator for Stable Transient Response
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Solution Overview
Problem
Existing linear regulators face challenges in maintaining high loop stability and transient response across varying load currents without altering the position of the dominant pole.
Innovation Solution
Incorporation of a compensation circuit, adaptive gain control circuit, buffer circuit, and feedback circuit that dynamically adjust loop gain based on load current, allowing for increased loop gain during heavy loads and decreased loop gain during light loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the loop gain is increased to improve transient response, then the transient response is improved, but the loop stability deteriorates
Solution Approach 1:
The patent implements dynamic loop gain adjustment by detecting load current levels and selectively enabling different gain paths. The loop gain is increased during heavy load conditions to improve transient response, and decreased during light load conditions to maintain loop stability. This dynamic adaptation resolves the contradiction by making the loop gain variable rather than fixed.
Solution Approach 2:
The patent changes the loop gain parameter based on operating conditions. By using load current detection and conditional circuit activation, the loop gain parameter is adjusted between different values to optimize both transient response and loop stability under different load conditions.
2Stability of the object's composition
If the loop gain is decreased to improve loop stability, then the loop stability is improved, but the transient response deteriorates
Solution Approach 1:
The patent implements dynamic loop gain adjustment by detecting load current levels and selectively enabling different gain paths. The loop gain is increased during heavy load conditions to improve transient response, and decreased during light load conditions to maintain loop stability. This dynamic adaptation resolves the contradiction by making the loop gain variable rather than fixed.
Solution Approach 2:
The patent changes the loop gain parameter based on operating conditions. By using load current detection and conditional circuit activation, the loop gain parameter is adjusted between different values to optimize both transient response and loop stability under different load conditions.
3Device complexity
If a fixed loop gain is used to simplify circuit design, then the device complexity is reduced, but the performance across varying load currents deteriorates
Solution Approach 1:
The patent applies different loop gain characteristics to different operating conditions by implementing condition-based circuit paths. The adaptive gain control circuit uses load current detection to selectively activate appropriate gain paths, providing locally optimized performance for each operating regime without requiring a completely complex redesign.
Solution Approach 2:
The patent implements dynamic loop gain adjustment by detecting load current levels and selectively enabling different gain paths. The loop gain is increased during heavy load conditions to improve transient response, and decreased during light load conditions to maintain loop stability. This dynamic adaptation resolves the contradiction by making the loop gain variable rather than fixed.
Data Source
AI summary
A linear regulator includes a compensation circuit, an adaptive gain control circuit, a buffer circuit, a driver circuit and a feedback circuit. The compensation circuit generates a compensation voltage based on a feedback voltage. A voltage level of the compensation voltage is changed based on a load current that is generated by an output voltage and flows through an output terminal. The adaptive gain control circuit tracks the load current based on the compensation voltage, and generates a first driving voltage by adjusting a loop gain based on an amount of the load current. The buffer circuit generates a second driving voltage by buffering the first driving voltage. The driver circuit is connected to the output terminal, and generates the output voltage based on the second driving voltage. The feedback circuit is connected to the output terminal, and generates the feedback voltage based on the output voltage.