Abstract: Some embodiments of the invention include a thruster system comprising a thruster and a pulsing power supply. The thruster may include a gas inlet port; a plasma jet outlet; and a first electrode. In some embodiments, the pulsing power supply may provide an electrical potential to the first electrode with a pulse repetition frequency greater than 10 kHz, a voltage greater than 5 kilovolts. In some embodiments, the pressure downstream from the thruster can be less than 10 Torr. In some embodiments, when a plasma is produced within the thruster by energizing a gas flowing into the thruster through the gas inlet port, the plasma is expelled from the thruster through the plasma jet outlet.
Type:
Grant
Filed:
December 22, 2022
Date of Patent:
May 7, 2024
Assignee:
EHT Ventures LLC
Inventors:
Timothy M. Ziemba, James R. Prager, John G. Carscadden, Kenneth E. Miller, Ilia Slobodov, Julian F. Picard, Akel Hashim
Abstract: Embodiments of the invention provide IGBT circuit modules with increased efficiencies. These efficiencies can be realized in a number of ways. In some embodiments, the gate resistance and/or voltage can be minimized. In some embodiments, the IGBT circuit module can be switched using an isolated receiver such as a fiber optic receiver. In some embodiments, a single driver can drive a single IGBT. And in some embodiments, a current bypass circuit can be included. Various other embodiments of the invention are disclosed.
Type:
Grant
Filed:
August 17, 2021
Date of Patent:
May 7, 2024
Assignee:
EHT Ventures LLC
Inventors:
Timothy Ziemba, Kenneth E. Miller, John G. Carscadden, James Prager
Abstract: Some embodiments of the invention include a pre-pulse switching system. The pre-pulsing switching system may include: a power source configured to provide a voltage greater than 100 V; a pre-pulse switch coupled with the power source and configured to provide a pre-pulse having a pulse width of Tpp; and a main switch coupled with the power source and configured to provide a main pulse such that an output pulse comprises a single pulse with negligible ringing. The pre-pulse may be provided to a load by closing the pre-pulse switch while the main switch is open. The main pulse may be provided to the load by closing the main switch after a delay Tdelay after the pre-pulse switch has been opened.
Type:
Grant
Filed:
March 29, 2022
Date of Patent:
April 16, 2024
Assignee:
EHT VENTURES LLC
Inventors:
Kenneth E. Miller, James R. Prager, Ilia Slobodov, Julian F. Picard
Abstract: Some embodiments of the invention may include an eddy current nondestructive evaluation device. The eddy current nondestructive evaluation device may include a rotating body; a motor coupled with the rotating body such that the motor rotates the rotating body; a permanent magnet coupled with the rotating body; a pickup coil coupled with the rotating body; and an integrator circuit electrically coupled with the pickup coil that integrates a voltage from the pickup coil to produce integrated voltage data.
Type:
Grant
Filed:
October 4, 2021
Date of Patent:
January 2, 2024
Assignee:
EHT Ventures LLC
Inventors:
James R. Prager, Timothy M. Ziemba, Kenneth E. Miller, Ilia Slobodov, Paul Melnik, Connor Liston, Kevin Muggli, TaiSheng Yeager, John G. Carscadden