Fragmentation of printed circuit boards by sub-microsecond and microsecond high-voltage pulses

2022 ◽  
Vol 176 ◽  
pp. 107340
Author(s):  
A.A. Zherlitsyn ◽  
V.M. Alexeenko ◽  
E.V. Kumpyak ◽  
S.S. Kondratiev
Keyword(s):  
High Voltage ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Voltage Pulses

Arcing and Spacing Requirements for High Voltage Printed Circuit Boards

2015 ◽  
Author(s):  
Prabjit Singh
Keyword(s):  
High Voltage ◽  
Printed Circuit Boards ◽  
Power Supplies ◽  
Circuit Boards ◽  
High Voltage Power Supply ◽  
Conformal Coating ◽  
Printed Circuit ◽  
Electronic Hardware ◽  
Vacuum Test ◽  
Partial Vacuum

The electronic hardware miniaturization trend continues unabated. The reduced feature spacing expose the high voltage power supply circuits to arcing. The power MOSFET gate to drain and the drain to source lead gaps are narrow enough for zinc whiskers emanating from under the raised floor zinc plated tiles to arc across the MOSFET leads. Arcing can also occur because of paper cellulose fibers and dust in high relative humidity environments. The physics of arcing will be presented. Paschen’s law of arcing will be described; it will be shown how the law led to a novel way of testing power supplies for propensity to arcing. Examples of application of the test, called the partial vacuum test, to power supplies will be described. Testing the integrity of conformal coating is one useful application of the partial vacuum test. A novel zinc whisker spray test, developed to determine the spacing required to avoid arcing between features at high electric potential between them, will be described and its results will be presented that verify the UL feature spacing guidelines.

scholarly journals Electric Discharge Destruction of Wasted Printed Electronic Boards for Extraction of Metals

2020 ◽  
Author(s):  
V.M. Alexeenko ◽  
L.G. Ananieva ◽  
A.A. Zherlitsyn ◽  
S.S. Kondratiev ◽  
M.V. Korovkin ◽  
...  
Keyword(s):  
Electric Discharge ◽  
High Voltage ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Fractional Composition ◽  
Optical Microscope ◽  
Circuit Board ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Board

The results of the electric discharge crushing of PCB (printed circuit boards) to millimeter-sized fractions suitable for separation of the metal from the dielectric are presented. The crushing was performed on a high-voltage repetitively pulsed generator with varying the number of pulses. It was determined the dependences of the fractional composition of crushing products on the number of pulses in the cycle. Crushing products were studied for definition separation of metal from the dielectric with optical microscope. The results of the work confirm the possibility of electric discharge crushing various types of PCB, including fiberglass PCB with four layers. Keywords: high voltage fragmentation, waste printed circuit board, recycling

The stripping effect of using high voltage electrical pulses breakage for waste printed circuit boards

2018 ◽  
Vol 77 ◽  
pp. 603-610 ◽  
Author(s):  
Chenlong Duan ◽  
Jun Han ◽  
Shen Zhao ◽  
Zhonglin Gao ◽  
Jinpeng Qiao ◽  
...  
Keyword(s):  
High Voltage ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Electrical Pulses
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