Feedback Constant Voltage Circuit for Adjustable Output Levels
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Solution Overview
Problem
Conventional constant voltage circuits are limited by the breakdown voltage of the Zener diode, restricting the ability to supply arbitrary constant voltages.
Innovation Solution
A constant voltage circuit incorporating a depletion transistor, a voltage division circuit, and enhancement transistors with a pull-down element, utilizing a negative feedback loop to adjust the voltage division ratio and supply arbitrary constant voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Zener diode is used to generate constant voltage, then the circuit structure is simple, but the output voltage is limited to the breakdown voltage of the Zener diode and cannot be adjusted arbitrarily
Solution Approach 1:
The patent applies the dynamics principle by making the constant voltage output adjustable through a control signal. The constant voltage value can be dynamically changed by adjusting the control signal applied to the gate of the first depletion type transistor, transforming a static Zener diode-based circuit into a dynamic,可调 constant voltage circuit that adapts to different voltage requirements.
Solution Approach 2:
The patent implements parameter changes by controlling the constant voltage output through parameter adjustment of the control signal. By varying the control signal voltage applied to the gate of the depletion type transistor, the output constant voltage can be precisely controlled to different values, enabling arbitrary voltage adjustment without changing the physical circuit structure.
2Adaptability or versatility
If a Zener diode breakdown phenomenon is used, then the constant voltage is generated, but the voltage is determined by the semiconductor process and cannot be freely selected
Solution Approach 1:
The patent overcomes the semiconductor process limitation by using parameter changes through electrical control. The constant voltage value is no longer fixed by the Zener breakdown voltage determined during manufacturing, but can be continuously adjusted by changing the control signal parameter applied to the gate, allowing precise selection of any constant voltage value within the operating range.
Solution Approach 2:
The patent replaces the physical Zener diode breakdown mechanism with a field-effect transistor-based voltage control mechanism. Instead of relying on the fixed breakdown phenomenon of the Zener diode, the invention uses the electric field control characteristics of the depletion type transistor to generate and control the constant voltage, substituting a flexible electronic control system for a rigid physical breakdown mechanism.
Data Source
AI summary
A constant voltage circuit includes a depletion transistor having a drain, a gate, and a source, the drain connected to a first power supply terminal, and the gate connected to the source, a voltage division circuit connected between the first power supply terminal and an output terminal, a first enhancement transistor having a drain connected to the source of the depletion transistor, a source connected to the output terminal, and a gate connected to an output terminal of the voltage division circuit, a second enhancement transistor having a source connected to the first power supply terminal, a drain connected to the output terminal, and a gate connected to the drain of the first enhancement transistor, and a pull-down element having one end connected to the output terminal and the other end connected to a second power supply terminal.