Arun K Kadavelugu

20200251927, Aug 6, 2020

Jan 31, 2019

16/263424

- Baden, CH
James Stoupis - Raleigh NC, US
Arun K. Kadavelugu - Raleigh NC, US
Bandeep Singh - Knightdale NC, US

H02J 13/00
G01R 15/14
G01R 19/15

Devices, systems, and methods for measurement of parameters of electric power transmission lines can improve electric power usage, while wireless circuitry can provide communication from field-located devices. Connection to draw electrical power from the transmission line can be distinct from connection to sense line parameters.

20200052608, Feb 13, 2020

Oct 21, 2019

16/658911

- Baden, CH
Arun Kumar Kadavelugu - Raleigh NC, US

H02M 7/219
H02M 1/088

A converter system includes a DC bus for each phase of an input AC power signal; a first switching cell for each phase, including first two active switches coupled in series across the DC bus and forming a first switching cell AC pole therebetween, the first switching cell AC pole being coupled to a respective phase; and a second switching cell for each phase, including second two active switches coupled in series across the DC bus and forming a second switching cell AC pole therebetween. The second switching cell AC poles are coupled to each other to form a flying neutral. One of the first switching cell and the second switching cell switches at a frequency at least an order of magnitude greater than the line frequency. The other of the first switching cell and the second switching cell switches at a frequency approximately equal to the line frequency.

20190033362, Jan 31, 2019

Jul 25, 2017

15/659096

- Baden, CH
Arun Kadavelugu - Raleigh NC, US
Joonas Puukko - Helsinki, FI
Liming Liu - Cary NC, US
Jukka-Pekka Sjoroos - Espoo, FI

G01R 31/26
H01L 29/16
H01L 29/78
H03K 17/687

Unique systems, methods, techniques and apparatuses of semiconductor failure prognostication. One exemplary embodiment is a power converter comprising a semiconductor switch and a converter control system. The converter control system is configured to turn on the semiconductor switch, measure a first voltage and a current during reverse conduction, estimate junction temperature of the semiconductor device, turn off the semiconductor device, measure a second voltage after turning off the semiconductor device, determine a resistance value using the second voltage measurement, determine an expected resistance value, predict a failure of the semiconductor device using the resistance value and the expected resistance value, and transmit a semiconductor device failure warning.

20180041127, Feb 8, 2018

Aug 2, 2016

15/226664

- Baden, CH
Eddy Aeloiza - Apex NC, US
Arun Kadavelugu - Raleigh NC, US

H02M 3/24

Unique systems, methods, techniques and apparatuses of a gate drive system are disclosed. One exemplary embodiment is a drive circuit electrically coupled to a main switching device comprising a first inverter, a first inverter controller, an air core transformer, at least one rectifier, at least two smoothing capacitors, a current buffer stage, and a detection circuit. The first inverter controller is structured to operate the first inverter in a first mode and a second mode. The air core transformer is structured to receive the converted AC power from the first inverter. The detection circuit is structured to detect a first mode of the first inverter and a second mode of the first inverter, and operate the current buffer stage based on a detected first mode of the inverter and a detected second mode of the first inverter.