Voltage Regulator Dynamic Compensation Circuit
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Solution Overview
Problem
Conventional voltage regulators experience delayed response times due to droop or negative droop issues when adjusting output voltage in response to dynamic voltage identification (DVID) signals, failing to meet the required slew rate specifications.
Innovation Solution
A compensation signal generator is integrated into the voltage regulator's control circuit, which adjusts the feedback control loop to accelerate the slew rate of the output voltage, allowing it to reach target voltages more quickly by adding the compensation signal to various inputs within the error amplifier or PWM comparator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the voltage regulator increases the inductor current to charge the capacitor quickly, then the output voltage can be raised faster, but the detected load current appears to increase incorrectly causing unexpected voltage droop
Solution Approach 1:
The patent applies preliminary action by generating a compensation signal in advance based on the DVID signal before the actual voltage adjustment occurs. This compensation signal pre-adjusts the feedback control loop to anticipate the upcoming voltage change, thereby preventing the droop phenomenon from occurring in the first place. The compensation signal is calculated based on expected current changes and added to the feedback voltage, ensuring the voltage regulator responds accurately without unexpected droop when the output voltage needs to change rapidly.
2Stability of the object's composition
If the feedback control loop responds to inductor current changes, then it can maintain voltage stability, but it mistakes load current changes causing delayed response to reach target voltage
Solution Approach 1:
The patent introduces a compensation signal as an intermediary element between the DVID signal and the feedback control loop. This compensation signal acts as a mediator that translates the desired voltage change into a pre-adjusted feedback signal, allowing the feedback control loop to distinguish between actual load current changes and commanded voltage changes. By adding this intermediary compensation signal to the feedback voltage, the system maintains voltage stability while eliminating the time delay caused by the feedback loop misinterpreting current changes.
3Measurement precision
If a power consuming device is added to detect actual load current, then accurate load current detection is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies self-service by using the existing inductor current detection capability of the voltage regulator to infer load current information, combined with the DVID signal that already contains the commanded current change information. Instead of adding a separate power-consuming load current sensor, the system cleverly combines available signals (inductor current feedback and DVID signal) to generate the compensation signal. This approach allows accurate load current detection without adding extra power-consuming devices or increasing circuit complexity.
Data Source
AI summary
The present invention discloses a voltage regulator, and a control circuit and a control method therefor. The method for controlling a voltage regulator comprises: receiving a dynamic voltage identification signal which instructs the voltage regulator to change its output voltage to a target voltage, and generating a compensation signal to shorten an interval for the output voltage of the voltage regulator to reach the target voltage.