Constant current-controlled power supply circuit and field emission electron source
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United States of America Patent
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Nov 28, 2023
Grant Date -
Nov 24, 2022
app pub date -
Apr 17, 2020
filing date -
Oct 30, 2019
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Abstract
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, 1≤i≤n, i and n are natural numbers, n≥2, and 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 i and j are natural numbers; and a voltage control module configured to adjust an output voltage of the voltage source to cause a current passing through the load to be constant; the field effect transistors Si, 1≤i≤n, operate in a resistive region.
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