Regulator Circuit Dual Feedback for Load Transients
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Solution Overview
Problem
Existing regulator circuits struggle to respond effectively to steep fluctuations in input voltage and load without complicating the circuit configuration, particularly due to limitations in feedback paths and response speed.
Innovation Solution
Incorporating a current feedback path with a current source and transistor, in addition to a voltage feedback path, to control the output transistor, allowing for stable voltage supply during steep fluctuations without increasing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional voltage feedback path is used to stabilize output voltage, then the circuit configuration remains simple, but the response speed to steep load fluctuations is insufficient
Solution Approach 1:
The patent introduces a current feedback path that directly feeds back the load current to the differential amplifying unit, complementing the existing voltage feedback path. This dual feedback mechanism enables the circuit to respond rapidly to load current changes while maintaining stable output voltage, resolving the contradiction between response speed and circuit complexity
Solution Approach 2:
The feedback mechanism is segmented into two independent paths: a voltage feedback path for maintaining output voltage stability and a current feedback path for rapid response to load fluctuations. This segmentation allows each path to specialize in its function without interfering with the other, achieving high-speed response while keeping the overall circuit configuration manageable
2Reliability
If multiple transistors are added to create a feedback path as suggested in Patent Document 3, then the feedback signal can be received properly, but the circuit configuration becomes complicated
Solution Approach 1:
The differential amplifying unit serves multiple functions: it processes both voltage feedback signals and current feedback signals, and directly controls the output transistor without requiring additional intermediate transistors. This multi-functionality ensures reliable feedback signal reception while avoiding circuit complexity
Solution Approach 2:
The patent merges the voltage feedback path and current feedback path at the differential amplifying unit, which processes both signals simultaneously. This merging eliminates the need for separate feedback paths with multiple transistors, achieving reliable feedback while maintaining circuit simplicity
Data Source
AI summary
The present technology relates to a regulator circuit and a control method capable of coping with steep change in load. An output transistor provided between an input terminal and an output terminal, a differential amplifying unit that amplifies a difference between reference voltage and voltage fed back from the output transistor, a voltage feedback path, and a current feedback path are provided, in which the current feedback path includes a current source and a transistor. The transistor included in the current feedback path is formed of an NMOS, a gate is connected to an output terminal of the differential amplifying unit, a drain is connected to the current source, and a source is connected to an input terminal of the differential amplifying unit. The present technology is applicable to a regulator circuit.