Switching Converter Load Regulation Compensation Module
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Solution Overview
Problem
Switching converters experience deteriorated load regulation due to offset voltage affecting the reference signal, which is not effectively compensated by existing technologies, leading to instability in output voltage regulation.
Innovation Solution
A load regulation compensation module is introduced, comprising a current sense circuit, filtering circuit, gain circuit, and superposing circuit, which senses the switching current, filters and gains the signal, and compensates the reference signal with a bandgap reference voltage to cancel out the average offset voltage, thereby stabilizing the load regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the switch module and control module are integrated and referenced to an internal reference ground connected via a resistive component, then the switching converter achieves compact integration and simplified structure, but an offset voltage is generated due to switching current flowing through the resistive component, which deteriorates load regulation performance
Solution Approach 1:
The patent introduces a compensation module as an intermediary between the reference generation module and the control module. This compensation module includes a current sense circuit that detects the switching current, a filtering circuit that processes the sensed signal, and a superposing circuit that adds the compensated signal to the reference signal, thereby eliminating the harmful offset voltage effect while maintaining the integrated structure
Solution Approach 2:
The patent implements a feedback mechanism where the current sense circuit continuously monitors the switching current flowing through the resistive component, and the compensation module adjusts the reference signal based on this feedback to cancel out the offset voltage, thus maintaining stable load regulation performance
2Device complexity
If the reference generation module is integrated in the same package with the switch module and referenced to the internal reference ground, then the overall device structure is simplified, but the reference signal bears the offset voltage with respect to the ground pin, which adversely worsens load regulation
Solution Approach 1:
The compensation module acts as an intermediary that processes the reference signal after it is generated by the integrated reference generation module. The superposing circuit adds the compensated signal to the original reference signal, effectively removing the offset voltage component while preserving the benefits of integrated module structure
Solution Approach 2:
The patent extracts the harmful offset voltage component from the reference signal through the current sense circuit and filtering circuit, separating it from the useful reference voltage. This extracted offset signal is then used by the superposing circuit to compensate the reference signal, thereby improving measurement precision while maintaining integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compensation module effectively cancels out the offset voltage, improving the load regulation performance of switching converters by stabilizing the reference signal, thus enhancing the stability and accuracy of output voltage regulation.
Implementation Method 1
a current sense circuit, configured to sense the switching current flowing through the resistive component
Implementation Method 2
a first filtering circuit, configured to receive the sense signal, and filter the sense signal to provide a first average signal indicative of an average of the sense signal
Implementation Method 3
a gain circuit, configured to receive the first average signal, and to apply a first gain to the first average signal to provide a compensation signal
Implementation Method 4
a superposing circuit, configured to receive the compensation signal and a second reference signal having a bandgap reference voltage with respect to the internal reference ground and, and to compensate the second reference signal with the compensation signal to generate the first reference signal
Data Source
AI summary
A switching converter and a load regulation compensation module for improving load regulation accuracy of the switching converter. The switching converter regulates its output voltage through controlling a switch module to switch on and off based on a first reference signal and a feedback signal indicative of the output voltage. The on and off switching of the switch module generates a switching current, resulting in an average offset voltage between an internal reference ground and a package ground pin of the switching converter. The load regulation compensation module is configured to monitor the switching current, and to compensate a second reference signal having a bandgap reference voltage referenced to the internal reference ground based on the monitored switching current to generate the first reference signal, so that the average offset voltage is substantially cancelled out from the first reference signal with respect to the package ground pin.