Patents by Inventor Sai Chun Tang
Sai Chun Tang 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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Publication number: 20230030041Abstract: A conventional wireless power transfer (WPT) system based on resonant inductive coupling typically operates at a peak power efficiency at the expense of a energy transfer rate. Impedance matching circuits can increase the energy transfer rate, but tend to increase the complexity, form factor, and weight of the WPT system. To overcome these limitations, a WPT system is described herein that includes a resonant circuit with integrated impedance matching. The resonant circuit includes a first coil, a first capacitor in series with the first coil, a second coil in series with the first coil and the first capacitor, and a second capacitor in parallel with the first coil and the first capacitor. The inductor coils and capacitances are tailored to increase the voltage gain and, thus, the energy transfer rate. The inductor coils also transmit or receive power, thus increasing the energy transfer rate and the power efficiency.Type: ApplicationFiled: August 9, 2022Publication date: February 2, 2023Applicant: Indigo Technologies, Inc.Inventor: Sai Chun Tang
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Patent number: 11418062Abstract: A conventional wireless power transfer (WPT) system based on resonant inductive coupling typically operates at a peak power efficiency at the expense of a energy transfer rate. Impedance matching circuits can increase the energy transfer rate, but tend to increase the complexity, form factor, and weight of the WPT system. To overcome these limitations, a WPT system is described herein that includes a resonant circuit with integrated impedance matching. The resonant circuit includes a first coil, a first capacitor in series with the first coil, a second coil in series with the first coil and the first capacitor, and a second capacitor in parallel with the first coil and the first capacitor. The inductor coils and capacitances are tailored to increase the voltage gain and, thus, the energy transfer rate. The inductor coils also transmit or receive power, thus increasing the energy transfer rate and the power efficiency.Type: GrantFiled: January 28, 2019Date of Patent: August 16, 2022Assignee: Indigo Technologies, Inc.Inventor: Sai Chun Tang
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Patent number: 11006998Abstract: Systems, methods, and media for wireless radio frequency lesioning are provided. In some embodiments, a system for wireless radio frequency comprises: a wireless radiofrequency device, comprising: a receiving coil, a plurality of capacitors coupled in parallel to the receiving coil, a first electrode, and a second electrode, wherein a capacitor of the plurality of capacitors is connected between the first electrode and the second electrode, and wherein capacitances of the plurality of capacitors cause the receiving coil to pair with a transmitter at an operating frequency; a transmitter comprising at least one transmitting coil; and a radiofrequency generator configured to apply a radiofrequency signal at the operating signal to the transmitter.Type: GrantFiled: January 31, 2018Date of Patent: May 18, 2021Assignee: The Brigham and Women's Hospital, Inc.Inventors: Sai Chun Tang, Michael Vaninetti
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Publication number: 20210044150Abstract: A conventional wireless power transfer (WPT) system based on resonant inductive coupling typically operates at a peak power efficiency at the expense of a energy transfer rate. Impedance matching circuits can increase the energy transfer rate, but tend to increase the complexity, form factor, and weight of the WPT system. To overcome these limitations, a WPT system is described herein that includes a resonant circuit with integrated impedance matching. The resonant circuit includes a first coil, a first capacitor in series with the first coil, a second coil in series with the first coil and the first capacitor, and a second capacitor in parallel with the first coil and the first capacitor. The inductor coils and capacitances are tailored to increase the voltage gain and, thus, the energy transfer rate. The inductor coils also transmit or receive power, thus increasing the energy transfer rate and the power efficiency.Type: ApplicationFiled: January 28, 2019Publication date: February 11, 2021Inventor: Sai Chun Tang
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Publication number: 20180214194Abstract: Systems, methods, and media for wireless radio frequency lesioning are provided. In some embodiments, a system for wireless radio frequency comprises: a wireless radiofrequency device, comprising: a receiving coil, a plurality of capacitors coupled in parallel to the receiving coil, a first electrode, and a second electrode, wherein a capacitor of the plurality of capacitors is connected between the first electrode and the second electrode, and wherein capacitances of the plurality of capacitors cause the receiving coil to pair with a transmitter at an operating frequency; a transmitter comprising at least one transmitting coil; and a radiofrequency generator configured to apply a radiofrequency signal at the operating signal to the transmitter.Type: ApplicationFiled: January 31, 2018Publication date: August 2, 2018Inventors: Sai Chun Tang, Michael Vaninetti
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Patent number: 9806536Abstract: Systems for wirelessly transmitting power to an implanted medical device. The wireless transmission system including a first and second transmitting coil both the first and second coil having substantially equal diameters and at least one conductor winding. A gap between the first transmitting second transmitting coil extending along a common axis by a distance equal to the radius of the first transmitting coil. A plurality of capacitors connected in series along the at least one conductor of the transmitting coils to divide the transmitting coils into a plurality of coil segments. An input connection is electronically coupled to the transmitting coils to deliver an excitation voltage to the transmitting coils to produce a substantially uniform magnetic field between the first transmitting coil and the second transmitting coil.Type: GrantFiled: October 11, 2013Date of Patent: October 31, 2017Assignee: THE BRIGHAM AND WOMEN'S HOSPITAL, INC.Inventor: Sai Chun Tang
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Publication number: 20150244178Abstract: Systems for wirelessly transmitting power to an implanted medical device. The wireless transmission system including a first and second transmitting coil both the first and second coil having substantially equal diameters and at least one conductor winding. A gap between the first transmitting second transmitting coil extending along a common axis by a distance equal to the radius of the first transmitting coil. A plurality of capacitors connected in series along the at least one conductor of the transmitting coils to divide the transmitting coils into a plurality of coil segments. An input connection is electronically coupled to the transmitting coils to deliver an excitation voltage to the transmitting coils to produce a substantially uniform magnetic field between the first transmitting coil and the second transmitting coil.Type: ApplicationFiled: October 11, 2013Publication date: August 27, 2015Inventor: Sai Chun TANG
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Patent number: 8102235Abstract: Optimal operating techniques are disclosed for using coreless printed-circuit-board (PCB) transformers under (1) minimum input power conditions and (2) maximum energy efficiency conditions. The coreless PCB transformers should be operated at or near the ‘maximum impedance frequency’ (MIF) in order to reduce input power requirement. For maximum energy efficiency, the transformers should be at or near the “maximum efficiency frequency” (MEF) which is below the MIF. The operating principle has been confirmed by measurement and simulation. The proposed operating techniques can be applied to coreless PCB transformers in many circuits that have to meet stringent height requirements, for example to isolate the gates of power MOSFET and IGBT devices from the input power supply.Type: GrantFiled: July 30, 2010Date of Patent: January 24, 2012Assignee: City University of Hong KongInventors: Shu Yuen Ron Hui, Sai Chun Tang
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Publication number: 20110050292Abstract: Optimal operating techniques are disclosed for using coreless printed-circuit-board (PCB) transformers under (1) minimum input power conditions and (2) maximum energy efficiency conditions. The coreless PCB transformers should be operated at or near the ‘maximum impedance frequency’ (MIF) in order to reduce input power requirement. For maximum energy efficiency, the transformers should be at or near the “maximum efficiency frequency” (MEF) which is below the MIF. The operating principle has been confirmed by measurement and simulation. The proposed operating techniques can be applied to coreless PCB transformers in many circuits that have to meet stringent height requirements, for example to isolate the gates of power MOSFET and IGBT devices from the input power supply.Type: ApplicationFiled: July 30, 2010Publication date: March 3, 2011Applicant: CITY UNIVERSITY OF HONG KONGInventors: Shu Yuen Ron HUI, Sai Chun TANG
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Patent number: 7768371Abstract: Optimal operating techniques are disclosed for using coreless printed-circuit-board (PCB) transformers under (1) minimum input power conditions and (2) maximum energy efficiency conditions. The coreless PCB transformers should be operated at or near the ‘maximum impedance frequency’ (MIF) in order to reduce input power requirement. For maximum energy efficiency, the transformers should be at or near the “maximum efficiency frequency” (MEF) which is below the MIF. The operating principle has been confirmed by measurement and simulation. The proposed operating techniques can be applied to coreless PCB transformers in many circuits that have to meet stringent height requirements, for example to isolate the gates of power MOSFET and IGBT devices from the input power supply.Type: GrantFiled: February 25, 2005Date of Patent: August 3, 2010Assignee: City University of Hong KongInventors: Shu Yuen Ron Hui, Sai Chun Tang
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Patent number: 6888438Abstract: Novel designs for printed circuit board transformers, and in particular for coreless printed circuit board transformers designed for operation in power transfer applications, in which shielding is provided by a combination of ferrite plates and thin conductive sheets.Type: GrantFiled: October 28, 2002Date of Patent: May 3, 2005Assignee: City University of Hong KongInventors: Ron Shu Yuen Hui, Sai Chun Tang
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Patent number: 6867587Abstract: A fluxgate excitation circuit comprises an excitation inductor having a resistance Rsat and an inductance Lsat. Vin is provided by a half bridge converter of MOSFET switches (S1, S2). The excitation inductor is driven so that it enters saturation at the transition as the excitation cycle passes from positive to negative. Thus, a high input rms current value of the excitation circuit can be achieved. Because the excitation inductor is saturated for part of the cycle it may be much smaller than heretofore and have a smaller power supply. Thus, the circuit finds application in small devices.Type: GrantFiled: February 21, 2003Date of Patent: March 15, 2005Assignee: National University of Ireland, GalwayInventors: Sai Chun Tang, Maeve Duffy, Pavol Ripka, William Gerard Hurley
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Publication number: 20030178993Abstract: A fluxgate excitation circuit comprises an excitation inductor having a resistance Rsat and an inductance Lsat. Vin is provided by a half bridge converter of MOSFET switches (S1, S2). The excitation inductor is driven so that it enters saturation at the transition as the excitation cycle passes from positive to negative. Thus, a high input rms current value of the excitation circuit can be achieved. Because the excitation inductor is saturated for part of the cycle it may be much smaller than heretofore and have a smaller power supply. Thus, the circuit finds application in small devices.Type: ApplicationFiled: February 21, 2003Publication date: September 25, 2003Inventors: Sai Chun Tang, Maeve Duffy, Pavel Ripka, William Gerard Hurley
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Publication number: 20030095027Abstract: Novel designs for printed circuit board transformers, and in particular for coreless printed circuit board transformers designed for operation in power transfer applications, are disclosed in which shielding is provided by a combination of ferrite plates and thin conductive sheets.Type: ApplicationFiled: October 28, 2002Publication date: May 22, 2003Applicant: City University of Hong KongInventors: Ron Shu Yuen Hui, Sai Chun Tang
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Publication number: 20030020583Abstract: Novel designs for printed circuit board transformers, and in particular for coreless printed circuit board transformers designed for operation in power transfer applications, are disclosed in which shielding is provided by a combination of ferrite plates and thin copper sheets.Type: ApplicationFiled: June 15, 2001Publication date: January 30, 2003Inventors: Ron Shu Yuen Hui, Sai Chun Tang
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Patent number: 6501364Abstract: Novel designs for printed circuit board transformers, and in particular for coreless printed circuit board transformers designed for operation in power transfer applications, are disclosed in which shielding is provided by a combination of ferrite plates and thin copper sheets.Type: GrantFiled: June 15, 2001Date of Patent: December 31, 2002Assignee: City University of Hong KongInventors: Ron Shu Yuen Hui, Sai Chun Tang