Voltage Regulator Overshoot Suppression Circuit Control
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Solution Overview
Problem
Existing voltage regulators tend to excessively detect overshoot in steady states, leading to reduced output voltage and increased noise, and consume unnecessary power.
Innovation Solution
A voltage regulator is designed with an overshoot detection circuit, an overshoot suppression circuit, and a driver state discrimination circuit that operates the overshoot suppression only in non-regulated states, preventing its operation in steady states to maintain output voltage and reduce noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overshoot suppression circuit operates continuously to suppress output voltage overshoot, then overshoot is suppressed, but output voltage is reduced and noise increases in steady state
Solution Approach 1:
The overshoot suppression circuit is designed to dynamically change its operation state based on the regulator's working condition. The control circuit activates the suppression circuit only during transient states (power-on, load change, input voltage change) and deactivates it during steady state, making the system adaptable to different operational phases and avoiding continuous suppression that causes noise and voltage reduction.
Solution Approach 2:
The control circuit continuously monitors the regulator's operation state and provides feedback to the overshoot suppression circuit. By detecting whether the system is in transient or steady state, the feedback mechanism enables intelligent activation and deactivation of the suppression circuit, ensuring it operates only when necessary and preventing harmful effects during stable operation.
2Reliability
If the overshoot suppression circuit operates continuously, then overshoot is suppressed, but power consumption increases
Solution Approach 1:
The overshoot suppression circuit operates periodically rather than continuously, being activated only during specific transient events (power-on, load changes, input voltage changes) and deactivated during steady state. This periodic operation pattern reduces unnecessary power consumption while maintaining effective overshoot suppression when actually needed.
Solution Approach 2:
The system dynamically adjusts the operational state of the overshoot suppression circuit based on real-time detection of transient versus steady state conditions. This dynamic control ensures the circuit consumes power only when overshoot suppression is necessary, optimizing the balance between reliability and energy efficiency.
3Measurement precision
If the capacitor is connected to detect overshoot in steady state, then overshoot detection is maintained, but output voltage reduces and noise increases
Solution Approach 1:
The capacitor connection for overshoot detection is dynamically controlled based on the operational state. The control circuit enables the capacitor connection during transient states for accurate overshoot detection and disables it during steady state, preventing the detection mechanism itself from causing noise and voltage reduction when overshoot is not present.
Solution Approach 2:
The control circuit uses feedback to determine whether the regulator is in transient or steady state, and accordingly controls the capacitor connection. This feedback mechanism ensures the overshoot detection function is activated only when necessary, maintaining measurement precision during transients while avoiding harmful effects during stable operation.
Data Source
AI summary
To provide a voltage regulator capable of preventing a reduction in output voltage and an increase in output noise in a steady state without performing suppression of an overshoot. A voltage regulator is equipped with an overshoot detection circuit which detects an overshoot on the basis of an output voltage, an overshoot suppression circuit which controls an output terminal of an error amplifier circuit, based on the output of the overshoot detection circuit, and a driver state discrimination circuit which discriminates the state of an output transistor, based on an output voltage of the error amplifier circuit. The driver state discrimination circuit is configured to control the operation of the overshoot suppression circuit.