Field Emission Power Supply Circuit for Constant Current Control
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Solution Overview
Problem
Field emission electron sources require a power supply circuit that maintains a stable current and responds instantaneously, as changes in current can degrade the performance of field emission electron source products.
Innovation Solution
A power supply circuit is designed with field effect transistors coupled in series, diodes, resistors, and a current feedback module to maintain a constant current through the load, utilizing a detection unit and control signal generation unit to adjust the internal resistance of the transistors, ensuring the transistors operate in a constant current region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power supply circuit is used, then the circuit structure is simple, but the current stability deteriorates and performance decreases
Solution Approach 1:
The patent implements a current feedback module that detects the output current and adjusts the gate voltage of the first field effect transistor accordingly. This feedback mechanism maintains constant current through the load by compensating for voltage fluctuations, directly resolving the current stability issue while accepting increased circuit complexity
Solution Approach 2:
The patent employs multiple field effect transistors with dynamically adjustable internal resistance rather than fixed resistance components. The transistors operate in constant current region with adjustable parameters, allowing the circuit to adapt to changing conditions and maintain stability despite the more complex dynamic structure
2Speed
If the field emission electron source responds quickly, then the response speed is fast, but the current stability may deteriorate
Solution Approach 1:
The patent positions the field effect transistors at the input stage of the power supply circuit, where they can preemptively regulate current before it reaches the field emission electron source. This preliminary current stabilization ensures that rapid response does not compromise stability, as the transistors prepare the current in advance
Solution Approach 2:
The current feedback module continuously monitors output current and provides real-time adjustment to the field effect transistor gate voltages. This closed-loop control ensures that even during rapid response transitions, the current remains stable by immediately compensating for any deviations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a constant output current with high voltage and fast response, enabling the field emission electron source to maintain performance and operate efficiently by adjusting internal resistances in real-time.
Implementation Method 1
a current feedback module configured to adjust an internal resistance of the field effect transistors Si, 1≤i≤n, coupled in series in sequence, so as to cause a current passing through the load to be constant; wherein the field effect transistors Si, 1≤i≤n, operate in a constant current region
Implementation Method 2
a detection unit coupled in series with the load and configured to detect the current passing through the load
Data Source
AI summary
A power supply circuit and a field emission electron source are provided. The power supply circuit includes: field effect transistors Si coupled in series via drains and sources in sequence, wherein 1≤i≤n, n≥2, and wherein a source of S1 is coupled to a negative electrode of a voltage source, and a drain of Sn is used as an output terminal of the power supply circuit to couple to a load; a first group of diodes D1i coupled in series; a first group of resistors R1j, 2≤j≤n; and a current feedback module configured to adjust an internal resistance of the field effect transistors Si, coupled in series in sequence, so as to cause a current passing through the load to be constant; wherein the field effect transistors Si, 1≤i≤n, operate in a constant current region.