Patents by Inventor Stephen Mark Iskander
Stephen Mark Iskander has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10645766Abstract: A high frequency energy generator system includes a plurality of high frequency energy generator heads. Each head includes a respective magnetron; a common drive unit for producing power for the plurality of magnetrons; and a connector arrangement connecting each of the plurality of heads to the common drive unit to supply power to the magnetrons. At least one of the heads is located remote from the common drive unit.Type: GrantFiled: July 29, 2013Date of Patent: May 5, 2020Assignee: TELEDYNE UK LIMITEDInventors: Paul Simon Burleigh, Stephen Mark Iskander
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Patent number: 9531353Abstract: A switching arrangement for applying voltage pulses across a load, comprising a plurality of capacitive elements (C1-C9) connected in series, and a first switch arrangement (S) connected to the series connection to apply voltage pulses to the load, and a second switch arrangement (S1, S2) connected to a capacitive element of the series connection, such that one of the capacitive elements (C1) can be switched out of or switched into the series connection, in order to produce voltage pulses of respectively lower or higher levels, without the need to dissipate energy into a resistive load.Type: GrantFiled: June 29, 2011Date of Patent: December 27, 2016Assignee: E2V TECHNOLOGIES (UK) LIMITEDInventors: Stephen Mark Iskander, Michael John Bland, Paul Ridgwell
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Publication number: 20150257209Abstract: A high frequency energy generator system (1) comprises: a plurality of high frequency energy generator heads (3) to (8), each head including a respective magnetron; a common drive unit (2) for producing power for the plurality of magnetrons; and a connector arrangement (9) connecting each of the plurality of heads (3) to (8) to the common drive unit (2) to supply power to the magnetrons, at least one of the heads being located remote from the common drive unit (2).Type: ApplicationFiled: July 29, 2013Publication date: September 10, 2015Inventors: Paul Simon Burleigh, Stephen Mark Iskander
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Publication number: 20130221876Abstract: A switching arrangement for applying voltage pulses across a load, comprising a plurality of capacitive elements (C1-C9) connected in series, and a first switch arrangement (S) connected to the series connection to apply voltage pulses to the load, and a second switch arrangement (S1, S2) connected to a capacitive element of the series connection, such that one of the capacitive elements (C1) can be switched out of or switched into the series connection, in order to produce voltage pulses of respectively lower or higher levels, without the need to dissipate energy into a resistive load.Type: ApplicationFiled: June 29, 2011Publication date: August 29, 2013Inventors: Stephen Mark Iskander, Michael John Bland, Paul Ridgwell
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Patent number: 7268991Abstract: A system to protect electrical circuits from rapid changes of voltage associated with a fault in an electrical load comprises an inductor placed in series between a drive circuit and load. The inductor is designed to be inefficient or lossy when the inductor core is magnetised. Magnetisation of the core only occurs when a rapid change in voltage is applied across the inductor coils. Because the inductor is inefficient, the induced impedance in the inductor increases rapidly during a fault event. The overall impedance of the circuit increases rapidly and the rapid change in voltage is dissipated at a rate associated with the CR constant of the circuit.Type: GrantFiled: June 14, 2002Date of Patent: September 11, 2007Assignee: E2V Technologies (UK) LimitedInventors: Emma Louise Innes, Stephen Mark Iskander
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Patent number: 7256637Abstract: A switching arrangement for a high voltage load provides high voltage pulses to the load. The switching arrangement includes switching modules, where n is typically (75). A load capacitance is Cd is required to avoid voltage overshoot at the load and is provided by a capacitance of nCd arranged in parallel with each switch.Type: GrantFiled: June 14, 2002Date of Patent: August 14, 2007Assignee: E2V Technologies (UK) LimitedInventors: Stephen Mark Iskander, Robert Richardson, Paul Andrew Gooch
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Patent number: 7221558Abstract: A high voltage switching apparatus delivers kV pulses to a load such as a magnetron. The switching apparatus comprises a switching stack surrounded by capacitors and both arranged within a housing. Lt power is supplied to the stack, e.g. for control electronics, by magnetic coupling across a non-conducting wall of the housing. Annular inserts are arranged on either side of the wall. Each insert receives a transformer core and winding. The bottom surfaces of the inserts carry a conductive coating to minimise electric stresses. Ht power is also supplied through the wall.Type: GrantFiled: June 14, 2002Date of Patent: May 22, 2007Assignee: E2V Technologies (UK) LimitedInventors: Stephen Mark Iskander, David Bernard Fox, Robert Richardson
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Patent number: 7061360Abstract: A rectifier transformer comprises two secondary windings, preferably with a single turn on each winding. The rectifier diodes form an integral part of each of the secondary windings. Thus, a compact arrangement is realised. In a high voltage application, the rectifier diodes comprise a plurality of relatively low voltage diodes in parallel to one another. The overall capacitance of the rectifier circuit is reduced by this arrangement.Type: GrantFiled: December 15, 2003Date of Patent: June 13, 2006Assignee: E2V Technologies (UK) LimitedInventors: Robert Richardson, Stephen Mark Iskander, Matthew Kevin Hicks
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Publication number: 20040218333Abstract: A system to protect electrical circuits from rapid changes of voltage associated with a fault in an electrical load comprises an inductor placed in series between a drive circuit and load. The inductor is designed to be inefficient or lossy when the inductor core is magnetised. Magnetisation of the core only occurs when a rapid change in voltage is applied across the inductor coils. Because the inductor is inefficient, the induced impedance in the inductor increases rapidly during a fault event. The overall impedance of the circuit increases rapidly and the rapid change in voltage is dissipated at a rate associated with the CR constant of the circuit.Type: ApplicationFiled: June 14, 2004Publication date: November 4, 2004Inventors: Emma Louise Innes, Stephen Mark Iskander
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Publication number: 20040190231Abstract: A high voltage switching apparatus delivers kV pulses to a load such as a magnetron. The switching apparatus comprises a switching stack surrounded by capacitors and both arranged within a housing. Lt power is supplied to the stack, e.g. for control electronics, by magnetic coupling across a non-conducting wall of the housing. Annular inserts are arranged on either side of the wall. Each insert receives a transformer core and winding. The bottom surfaces of the inserts carry a conductive coating to minimise electric stresses. Ht power is also supplied through the wall.Type: ApplicationFiled: December 12, 2003Publication date: September 30, 2004Inventors: Stephen Mark Iskander, David Bernard Fox, Robert Richardson
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Publication number: 20040183506Abstract: A switching arrangement for a high voltage load provides high voltage pulses to the load. The switching arrangement includes switching modules, where n is typically (75). A load capacitance is Cd is required to avoid voltage overshoot at the load and is provided by a capacitance of nCd arranged in parallel with each switch.Type: ApplicationFiled: December 12, 2003Publication date: September 23, 2004Inventors: Stephen Mark Iskander, Robert Richardson, Paul Andrew Gooch
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Publication number: 20040174145Abstract: A rectifier transformer comprises two secondary windings, preferably with a single turn on each winding. The rectifier diodes form an integral part of each of the secondary windings. Thus, a compact arrangement is realised. In a high voltage application, the rectifier diodes comprise a plurality of relatively low voltage diodes in parallel to one another. The overall capacitance of the rectifier circuit is reduced by this arrangement.Type: ApplicationFiled: December 15, 2003Publication date: September 9, 2004Applicant: E2V Technologies LimitedInventors: Robert Richardson, Stephen Mark Iskander, Matthew Kevin Hicks
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Patent number: 6496047Abstract: In a switching arrangement, a plurality of modules are connected such that the main switching elements, FETs, are in series. Control of and power to the FETs is supplied via a single turn primary passing through a plurality of toroidal secondary transformers. A train of control pulses is applied to the single turn primary and their polarity determines whether the main FET is switched on or off, the length of the pulse train determining the pulse width and PRF of the output of the switching arrangement. The control pulses are also used to supply power to the main driver of the main FET.Type: GrantFiled: June 23, 1999Date of Patent: December 17, 2002Assignee: EEV LiimitedInventors: Stephen Mark Iskander, Robert Richardson