A High-Voltage Terminal for a Field-Emission Gun

1972 ◽  
Vol 30 ◽  
pp. 428-429
Author(s):  
N. F. Ziegler
Keyword(s):  
Field Emission ◽  
High Voltage ◽  
Atmospheric Pressure ◽  
Power Supplies ◽  
High Coherence

A high-voltage terminal has been constructed for housing the various power supplies and metering circuits required by the field-emission gun (described elsewhere in these Proceedings) for the high-coherence microscope. The terminal is cylindrical in shape having a diameter of 14 inches and a length of 24 inches. It is completely enclosed by an aluminum housing filled with Freon-12 gas at essentially atmospheric pressure. The potential of the terminal relative to ground is, of course, equal to the accelerating potential of the microscope, which in the present case, is 150 kilovolts maximum.

scholarly journals High Power Density, High-Voltage Parallel Resonant Converter Using Parasitic Capacitance on the Secondary Side of a Transformer

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1736
Author(s):  
Jaean Kwon ◽  
Rae-Young Kim
Keyword(s):  
Power Density ◽  
High Voltage ◽  
Electrostatic Precipitator ◽  
Power Supplies ◽  
Equivalent Model ◽  
Resonant Converter ◽  
High Voltage Power Supply ◽  
Resonant Capacitor ◽  
Parasitic Components ◽  
Secondary Side

High-voltage DC power supplies are used in several applications, including X-ray, plasma, electrostatic precipitator, and capacitor charging. However, such a high-voltage power supply has problems, such as a decrease in reliability, owing to an increase in output ripple voltage, and a decrease in power density, owing to an increase in volume. Therefore, this study proposes a method for improving the power density of a parallel resonant converter using the parasitic capacitor of the secondary side of the transformer. Due to the fact that high-voltage power supplies have many turns on the secondary side, a significant number of parasitic capacitors are generated. In addition, in the case of a parallel resonant converter, because the transformer and the primary resonant capacitor are connected in parallel, the parasitic capacitor component generated on the secondary side of the transformer can be equalized and used. A parallel cap-less resonant converter structure developed using the parasitic components of such transformers is proposed. Primary side and secondary side equivalent model analyses are conducted in order to derive new equations and gain waveforms. Finally, the validity of the proposed structure is verified experimentally.

Cathode-sheath model for field emission sustained atmospheric pressure discharges

2021 ◽  
Vol 28 (3) ◽  
pp. 033506
Author(s):  
E. Cejas ◽  
L. Prevosto ◽  
F. O. Minotti ◽  
M. Ferreyra ◽  
J. C. Chamorro ◽  
...  
Keyword(s):  
Field Emission ◽  
Atmospheric Pressure ◽  
Cathode Sheath

High voltage, high current stabilized power supplies

1962 ◽  
Vol 39 (2) ◽  
pp. 99-99
Author(s):  
Electronic Machine Co Ltd.
Keyword(s):  
High Voltage ◽  
Power Supplies ◽  
High Current

Review of Research on High-voltage Power Supplies Based on Pulse Step Modulation

2021 ◽  
Author(s):  
Bangyou Zhu ◽  
Shaoxiang Ma ◽  
Shengyuan Guan ◽  
Ming Zhang ◽  
Kexun Yu ◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supplies

scholarly journals Analysis of Capacitance to Ground Formulas for Different High-Voltage Electrodes

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1090 ◽  
Author(s):  
Jordi-Roger Riba ◽  
Francesca Capelli
Keyword(s):  
High Voltage ◽  
Fem Simulation ◽  
Operating Conditions ◽  
Power Supplies ◽  
Measuring Instruments ◽  
Stray Capacitance ◽  
Analytical Formulas ◽  
Circular Rings ◽  
Available Information ◽  
Limited Scope

Stray capacitance can seriously affect the behavior of high-voltage devices, including voltage dividers, insulator strings, modular power supplies, or measuring instruments, among others. Therefore its effects must be considered when designing high-voltage projects and tests. Due to the difficulty in measuring the effects of stray capacitance, there is a lack of available experimental data. Therefore, for engineers and researchers there is a need to revise and update the available information, as well as to have useful and reliable data to estimate the stray capacitance in the initial designs. Although there are some analytical formulas to calculate the capacitance of some simple geometries, they have a limited scope. However, since such formulas can deal with different geometries and operating conditions, it is necessary to assess their consistency and applicability. This work calculates the stray capacitance to ground for geometries commonly found in high-voltage laboratories and facilities, including wires or rods of different lengths, spheres and circular rings, the latter ones being commonly applied as corona protections. This is carried out by comparing the results provided by the available analytical formulas with those obtained from finite element method (FEM) simulation, since field simulation methods allow solving such problem. The results of this work prove the suitability and flexibility of the FEM approach, because FEM models can deal with wider range of electrodes, configurations and operating conditions.

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