Booster Circuit Feedback Using an External Precision Reference
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Solution Overview
Problem
Existing booster circuits face challenges in maintaining output voltage accuracy due to large errors in feedback reference voltages, leading to significant deviations from set values, especially when temperature drift occurs, complicating control processing.
Innovation Solution
A booster circuit design that includes a power supply unit generating a reference voltage with lower error than the feedback reference voltage and a control unit comparing the output voltage with this reference voltage to output a control signal, ensuring the output voltage coincides with the set value regardless of feedback reference voltage errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is performed using an internal feedback reference voltage of a control IC, then the output voltage can be controlled to a set value, but the output voltage deviates greatly from the set value when the feedback reference voltage has large errors
Solution Approach 1:
The patent introduces an external reference voltage as an intermediary element to mediate between the control IC and the feedback control mechanism. This external reference voltage serves as a more stable mediator that replaces the unreliable internal feedback reference voltage, thereby improving output voltage accuracy without compromising control functionality
Solution Approach 2:
The patent changes the key parameter of reference voltage by sourcing it from an external stable voltage reference rather than using the internal feedback reference voltage of the control IC. This parameter change directly addresses the accuracy issue by substituting a more stable voltage reference while maintaining the feedback control architecture
2Measurement precision
If a stable reference voltage is used to improve output voltage accuracy, then additional voltage reference components are required, increasing circuit complexity
Solution Approach 1:
The external reference voltage serves multiple functions simultaneously: it provides the reference for feedback control, stabilizes the output voltage, and compensates for temperature drift effects. This multi-functionality reduces the need for separate compensation circuits and other additional components that would increase complexity
Solution Approach 2:
The external reference voltage inherently provides its own stability and temperature compensation characteristics without requiring additional active compensation circuits. The component itself possesses the necessary stability properties, eliminating the need for separate temperature compensation mechanisms and reducing overall circuit complexity
Data Source
AI summary
A booster circuit includes a boost converter configured to boost an input voltage and performs feedback control such that an output voltage becomes a set value on the basis of a voltage applied to a feedback terminal and an internal feedback reference voltage, a power supply unit configured to generate a reference voltage with a smaller error than the feedback reference voltage, and a control unit configured to compare a voltage corresponding to the output voltage of the boost converter with the reference voltage, and configured to output a control signal indicating a comparison result to the feedback terminal of the boost converter.