Dual-Mode Constant Voltage Circuit for Fast Load Response
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Solution Overview
Problem
Conventional constant voltage circuits face challenges in efficiently managing current consumption and response speed, particularly in scenarios with varying load conditions, leading to suboptimal performance in maintaining stable output voltage.
Innovation Solution
The proposed constant voltage circuit incorporates a dual-mode operation system, utilizing a first gain stage and a second gain stage with transistors and current monitors to dynamically adjust the gate voltage of transistors based on threshold values, switching between low current consumption and high-speed response modes to maintain stable output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional linear regulator is used, then the output voltage is maintained stable, but the current consumption is high and response speed is slow under varying load conditions
Solution Approach 1:
The patent implements dynamic operation mode switching between first and second gain stages based on load conditions. The circuit automatically transitions between high-precision mode (first gain stage) and high-speed response mode (second gain stage), making the system characteristics variable rather than fixed, thereby resolving the contradiction between stable output voltage and low current consumption.
Solution Approach 2:
The patent changes the operating parameters (gain stage selection, current consumption level, response speed) based on detected load conditions. By adjusting which gain stage is active according to the operational state, the system optimizes the balance between output stability and energy consumption, addressing the technical contradiction.
2Reliability
If a conventional linear regulator is used, then the output voltage is maintained stable, but the response speed to voltage fluctuations is slow
Solution Approach 1:
The patent dynamically switches between gain stages with different response characteristics. The first gain stage provides high precision for stable conditions, while the second gain stage provides fast response during transients. This dynamic adaptation resolves the contradiction between stability and response speed.
Solution Approach 2:
The patent divides the regulation function into two separate gain stages with specialized functions. The first gain stage handles precision regulation, while the second gain stage handles fast response to fluctuations. This functional segmentation allows each stage to optimize for its specific purpose, resolving the stability-speed contradiction.
3Speed
If high current is used in the gain stage, then the response speed is fast, but the current consumption increases
Solution Approach 1:
The patent makes the current consumption and response speed characteristics variable by switching between gain stages based on operational needs. During transient conditions, the second gain stage provides fast response with higher current. During steady-state, the first gain stage provides lower current consumption. This dynamic adjustment resolves the contradiction between speed and energy use.
Solution Approach 2:
The patent employs periodic or conditional switching between operation modes based on detected voltage fluctuations. The circuit alternates between high-current fast-response mode and low-current steady-state mode, optimizing the trade-off between response speed and current consumption over time.
Data Source
AI summary
According to one embodiment, a constant voltage circuit includes: a first gain stage configured to output a first voltage amplified based on an output voltage and a reference voltage; a first transistor configured to control the output voltage based on the first voltage; a second transistor configured to control a current that flows through the first gain stage; a first circuit configured to convert an amount of fluctuation in the output voltage into a first current; and a second circuit configured to control a gate voltage of the second transistor based on the first current. A third current or a fourth current greater than the third current flows through the first gain stage based on the gate voltage of the second transistor.