LDO Regulator Adaptive Current Control for Transient Response
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Solution Overview
Problem
Conventional low-dropout voltage regulators exhibit poor transient response times and dramatic voltage changes when switching between loads, requiring large external capacitors that increase production costs and reduce regulator performance.
Innovation Solution
A low-dropout voltage regulator apparatus comprising a voltage source circuit, error amplifier, output transistor, resistor-capacitor circuit, detection circuit, and current adjusting circuit, which generates threshold voltage signals to adaptively adjust the current through the output transistor, reducing transient response time and stabilizing output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a very large external regulating capacitor is used to reduce dramatic voltage change, then the voltage stability is improved, but the production cost increases and the loop bandwidth is reduced
Solution Approach 1:
The patent applies preliminary action by detecting voltage changes before they become dramatic and preemptively adjusting the output transistor's conduction degree. The detection circuit monitors the output voltage and triggers the current adjusting circuit to modify the transistor current in advance, preventing voltage dips or jumps before they occur, thus maintaining voltage stability without requiring large external capacitors.
Solution Approach 2:
The patent implements feedback through the detection circuit that continuously monitors the output voltage and feeds this information back to the current adjusting circuit. When the detection circuit detects a voltage change exceeding a threshold, it triggers the current adjusting circuit to modify the output transistor's current, creating a closed-loop control system that maintains voltage stability dynamically.
2Stability of the object's composition
If a very large external regulating capacitor is used to reduce dramatic voltage change, then the voltage stability is improved, but the loop bandwidth is reduced and regulator performance deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting voltage changes before they become dramatic and preemptively adjusting the output transistor's conduction degree. The detection circuit monitors the output voltage and triggers the current adjusting circuit to modify the transistor current in advance, preventing voltage dips or jumps before they occur, thus maintaining voltage stability without requiring large external capacitors that would limit bandwidth.
Solution Approach 2:
The patent implements feedback through the detection circuit that continuously monitors the output voltage and feeds this information back to the current adjusting circuit. When the detection circuit detects a voltage change exceeding a threshold, it triggers the current adjusting circuit to modify the output transistor's current, creating a closed-loop control system that maintains voltage stability dynamically without compromising loop bandwidth.
3Device complexity
If the conventional low-dropout voltage regulator is used, then the circuit structure is simple, but the transient response time is long and dramatic voltage changes occur
Solution Approach 1:
The patent applies preliminary action by detecting voltage changes before they become dramatic and preemptively adjusting the output transistor's conduction degree. The detection circuit monitors the output voltage and triggers the current adjusting circuit to modify the transistor current in advance, preventing voltage dips or jumps before they occur, thus maintaining voltage stability without requiring large external capacitors.
Solution Approach 2:
The patent implements feedback through the detection circuit that continuously monitors the output voltage and feeds this information back to the current adjusting circuit. When the detection circuit detects a voltage change exceeding a threshold, it triggers the current adjusting circuit to modify the output transistor's current, creating a closed-loop control system that maintains voltage stability dynamically.
Data Source
AI summary
A low-dropout voltage regulator apparatus includes a voltage source circuit, an error amplifier, an output transistor, a resistor-capacitor circuit, a detection circuit, and a current adjusting circuit. The voltage source circuit generates a reference voltage signal and at least one threshold voltage signal. The error amplifier receives the reference voltage signal and a feedback voltage signal to generate an output control signal. The output transistor provides an output current for the output terminal according to the output control signal. The resistor-capacitor circuit generates the feedback voltage signal using voltage dividing according to a voltage corresponding to the output current. The detection circuit compares at least one threshold voltage signal with the output voltage to generate at least one control voltage signal. The current adjusting circuit adaptively adjusts the current passing though the output transistor to decrease the transient response time according to the at least one control voltage signal.