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Crewson
Walter Crewson, Ridgefield, CT US
| Patent application number | Description | Published |
|---|---|---|
| 20080253052 | Electrical Power Switching With Efficient Switch Protection - A basic idea of the invention is to introduce a transmission delay line between the switch and the power output side of a power switching system so that any sparking of the load is hidden from the switch by the time delay of the transmission line. This makes it possible to detect the load spark and actively protect the switch, typically by turning the switch off, before it actually knows that there has been a load fault spark. Alternatively, the delay of the transmission line is long enough so that the switch has already been turned off in normal pulse operation before the load fault current reaches the switch. Either way, the switch will be turned off under normal current flow and will not be subject to destructive over-current or over-voltage conditions. | 10-16-2008 |
| 20110075310 | Electrical power switching with efficient switch protection - A transmission delay line is introduced between the switch and the power output side of a power switching system so that sparking of the load is hidden from the switch by the time delay of the transmission line. This makes it possible to detect the load spark and actively protect the switch, typically by turning the switch off, before it actually knows that there has been a load fault spark. Alternatively, the delay of the transmission line is long enough so that the switch has already been turned off in normal pulse operation before the load fault current reaches the switch. Either way, the switch will be turned off under normal current flow and will not be subject to destructive over-current or over-voltage conditions. | 03-31-2011 |
Walter F.j. Crewson, Munsonville, NH US
| Patent application number | Description | Published |
|---|---|---|
| 20090229982 | SYSTEM AND METHOD OF GENERATING A RINGING MAGNETIC PULSE FOR THE TREATMENT OF FLOWING LIQUIDS - A method and system of generating a ringing magnetic pulse for the treatment of flowing liquids includes a coil and an SCR coupled in series with the coil to form a first loop. An electronic switch is coupled in series with the coil to form a second loop. An AC voltage signal is applied to the coil having first and second half-cycles. Current is conducted through the first loop during the first half-cycle when the SCR is forward biased while preventing current from conducting through the second loop. Current is conducted through the second loop during a portion of the second half-cycle while current is prevented from conducting through the first loop. Current is interrupted through the second loop during another portion of the second half-cycle upon the coil current reaching a predetermined value to interrupt current flowing through the coil, thereby generating a ringing magnetic pulse. | 09-17-2009 |
| 20090236294 | METHOD AND APPARATUS FOR TREATING FLUIDS - A method and apparatus for treating a fluid to destroy, remove, or reduce undesirable agents, such as microorganisms, particles or ions, contained in the fluid and/or to inhibit the formation of scale are disclosed. | 09-24-2009 |
Walter Frederick John Crewson, Munsonville, NH US
| Patent application number | Description | Published |
|---|---|---|
| 20100327785 | PARTICLE ACCELERATOR AND MAGNETIC CORE ARRANGEMENT FOR A PARTICLE ACCELERATOR - A particle accelerator includes a power supply arrangement, multiple solid-state switched drive sections, a plurality of magnetic core sections and a switch control module. The drive sections are connected to the power supply arrangement for receiving electrical power therefrom, and each drive section includes a solid-state switch, electronically controllable at turn-on and turn-off, for selectively providing a drive pulse at an output of the drive section. The magnetic core sections are symmetrically arranged along a central beam axis, and each magnetic core of the sections is coupled to a respective drive section through an electrical winding connected to the output of the drive section. The switch control module is connected to the drive sections for providing control signals to control turn-on and turn-off of the solid state switches to selectively drive magnetic cores to induce an electric field for accelerating the beam of charged particles along the beam axis. | 12-30-2010 |
Walter Frederick John Crewson, Ridgefield, CT US
| Patent application number | Description | Published |
|---|---|---|
| 20090316438 | POWER SWITCH GROUPING - A power modulator comprises a plurality of switched pulse generator sections ( | 12-24-2009 |