Switching Regulator Output Error Compensation
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Solution Overview
Problem
Switching regulators face inaccuracies in output voltage due to errors between the root mean square value of the feedback voltage and the reference voltage, caused by variations in inductor current and equivalent series resistance, leading to imprecision in voltage accuracy.
Innovation Solution
Incorporating an error amplifier and an operator that generate a compensation signal to adjust the reference voltage, allowing the comparator to compare a more accurate compensation reference voltage with the feedback voltage, thereby correcting output errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional switching regulator uses a simple reference voltage generator and comparator without error compensation, then the device complexity is low and power efficiency is high, but the output voltage accuracy deteriorates due to errors between feedback voltage and reference voltage
Solution Approach 1:
An error amplifier is introduced as an intermediary component between the comparator and reference voltage generator. This error amplifier detects the voltage error between the feedback voltage and reference voltage, then generates a compensation signal to adjust the reference voltage accordingly, thereby improving output voltage accuracy without significantly increasing overall system complexity
Solution Approach 2:
The patent implements a feedback mechanism where the output voltage is continuously monitored through the feedback voltage, compared with the reference voltage, and the resulting error signal is used to dynamically adjust the reference voltage via the error amplifier. This closed-loop feedback system ensures high output voltage accuracy by continuously compensating for deviations
2Measurement precision
If the reference voltage is adjusted to compensate for errors, then the output voltage accuracy is improved, but the device complexity increases due to additional error amplifier and operator circuits
Solution Approach 1:
The error amplifier and operator circuits are merged into a unified error compensation module that works seamlessly with the existing comparator and reference voltage generator. By integrating these functions rather than adding completely separate systems, the patent achieves improved voltage accuracy while minimizing the increase in device complexity
Solution Approach 2:
The error amplifier dynamically changes the reference voltage parameter based on the detected error signal. By adjusting the reference voltage parameter in response to actual output deviations, the system achieves high accuracy without requiring complex hardware, as it leverages existing circuit components operating with modified parameters
Data Source
AI summary
A switching regulator includes a power stage, an output capacitor, a first reference voltage generator, a comparator, a constant-time trigger, an error amplifier, and an operator. The power stage includes a first switch, a second switch, and an output inductor. The comparator is coupled to the output inductor and the operator for receiving an output voltage and a compensation reference voltage. The error amplifier is coupled to the output inductor and the reference voltage generator. The constant-time trigger is coupled to the comparator and the power stage. The operator is coupled to the reference voltage generator and the error amplifier.