Dual-Feedback Switching Power Supply for Accurate Fast Voltage Regulation

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Solution Overview

Problem

Existing switching power supply systems face issues with low sampling accuracy and complex feedback networks, leading to control errors, slow response speeds, and increased complexity, which are unsuitable for high-demand applications.

Innovation Solution

A switching power supply system with both analog and digital feedback, incorporating primary and secondary feedback loops to indirectly and directly sample output voltage and current, respectively, allowing for precise regulation and error correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If primary feedback is used to indirectly sense load demand voltage through primary auxiliary winding voltage, then the structure is simple and cost is low, but sampling accuracy is low and control errors are large

Engineering Contradiction:

Improvefeedback circuit structureVSAvoidsampling accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The feedback system is segmented into two independent paths: primary feedback (auxiliary winding) and secondary feedback (output terminal direct detection). Each path handles different aspects of voltage regulation, with the secondary path providing high-precision direct measurement and the primary path providing fast response indirect regulation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism (primary feedback through auxiliary winding) that works alongside the direct secondary feedback. The primary feedback acts as a mediator that provides fast transient response by sensing voltage changes on the primary side, while the secondary feedback ensures accuracy by directly measuring output voltage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If secondary feedback is used to directly detect output voltage and current, then accuracy is high and dynamic response is good, but feedback network structure is complex and reliability issues increase

Engineering Contradiction:

Improveoutput voltage detection accuracyVSAvoidfeedback network structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges primary and secondary feedback networks into a unified dual-feedback system. The secondary feedback provides direct high-accuracy voltage detection at the output terminal, while the primary feedback handles current regulation and transient response, combining their advantages to achieve both accuracy and simplicity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The secondary feedback network is designed to serve multiple functions: direct voltage detection, accuracy correction, and coordination with primary feedback. This multi-functionality reduces the need for separate complex circuits while maintaining high precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If digital feedback is used, then control accuracy is high and circuit structure is simple, but feedback speed is slow

Engineering Contradiction:

Improvecontrol accuracyVSAvoidfeedback speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent replaces traditional analog feedback mechanisms with a hybrid system that uses digital processing for accuracy while maintaining analog-like speed through direct voltage sensing. The secondary feedback uses direct voltage detection with minimal processing delay, substituting complex digital conversion with a streamlined sensing approach.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Speed

If analog feedback is used, then feedback speed is fast, but system structure is complex and anti-interference ability is poor

Engineering Contradiction:

Improvefeedback speedVSAvoidsystem structure

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent employs a simplified secondary feedback approach that uses direct voltage sensing with minimal processing, effectively using a 'disposable' fast-response path for transient correction while relying on the more robust primary feedback for steady-state accuracy. This separates the fast-response function from the high-accuracy function.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS12407267B2Switching power supply system with both analog and digital feedback

Publication Date: 2025.09.02 MIX DESIGN SEMICON TECH LTD

AI summary

The present application discloses a switching power supply system with both analog and digital feedback, the steps for regulating an output voltage of the switching power supply system are as follows: indirectly obtaining the system output voltage on a primary side of the switch power supply, and regulating the output voltage for a first time by controlling a primary switch tuber; directly obtaining an actual output voltage of the system on a secondary side of the switching power supply, obtaining a voltage difference between the actual output voltage of the system and a load demand voltage, and regulating the output voltage secondary according to the voltage difference.