Patents by Inventor Robert J. Callanan

Robert J. Callanan 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).

  • Patent number: 11171229
    Abstract: The present disclosure relates to a power module that has a housing with an interior chamber and a plurality of switch modules interconnected to facilitate switching power to a load. Each of the plurality of switch modules comprises at least one transistor and at least one diode mounted within the interior chamber and both the at least one transistor and the at least one diode are majority carrier devices, are formed of a wide bandgap material system, or both. The switching modules may be arranged in virtually any fashion depending on the application. For example, the switching modules may be arranged in a six-pack, full H-bridge, half H-bridge, single switch or the like.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: November 9, 2021
    Assignee: Cree, Inc.
    Inventors: Mrinal K. Das, Robert J. Callanan, Henry Lin, John Williams Palmour
  • Publication number: 20170213811
    Abstract: The present disclosure relates to a power module that has a housing with an interior chamber and a plurality of switch modules interconnected to facilitate switching power to a load. Each of the plurality of switch modules comprises at least one transistor and at least one diode mounted within the interior chamber and both the at least one transistor and the at least one diode are majority carrier devices, are formed of a wide bandgap material system, or both. The switching modules may be arranged in virtually any fashion depending on the application. For example, the switching modules may be arranged in a six-pack, full H-bridge, half H-bridge, single switch or the like.
    Type: Application
    Filed: April 10, 2017
    Publication date: July 27, 2017
    Inventors: Mrinal K. Das, Robert J. Callanan, Henry Lin, John Williams Palmour
  • Patent number: 9640617
    Abstract: The present disclosure relates to a power module that has a housing with an interior chamber and a plurality of switch modules interconnected to facilitate switching power to a load. Each of the plurality of switch modules comprises at least one transistor and at least one diode mounted within the interior chamber and both the at least one transistor and the at least one diode are majority carrier devices, are formed of a wide bandgap material system, or both. The switching modules may be arranged in virtually any fashion depending on the application. For example, the switching modules may be arranged in a six-pack, full H-bridge, half H-bridge, single switch or the like.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: May 2, 2017
    Assignee: Cree, Inc.
    Inventors: Mrinal K. Das, Robert J. Callanan, Henry Lin, John Williams Palmour
  • Patent number: 9344077
    Abstract: A circuit, which includes a high voltage driver, is disclosed. The high voltage driver includes a P-type field effect transistor (PFET) and a source bias circuit. The source bias circuit receives a low voltage input signal and applies a direct current (DC) bias to the low voltage input signal to provide a DC biased signal. The PFET has a first source, a first gate, and a first drain. The first source receives the DC biased signal. The first gate receives a first low voltage DC supply signal. The first drain provides a high voltage output signal based on the DC biased signal and the first low voltage DC supply signal. In this regard, the high voltage driver receives and translates the low voltage input signal to provide the high voltage output signal.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: May 17, 2016
    Assignee: Cree, Inc.
    Inventor: Robert J. Callanan
  • Patent number: 8963576
    Abstract: A switching device driver, which includes switching circuitry and a first capacitive element, which is coupled to the switching circuitry, is disclosed. The switching circuitry receives a logic level input signal and provides a switching control output signal to a switching device based on the logic level input signal. When the logic level input signal has a first logic level, the switching circuitry charges the first capacitive element. When the logic level input signal transitions from the first logic level to a second logic level, the switching circuitry at least partially discharges the first capacitive element to rapidly transition the switching control output signal, thereby causing the switching device to quickly change states.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: February 24, 2015
    Assignee: Cree, Inc.
    Inventor: Robert J. Callanan
  • Patent number: 8817441
    Abstract: A circuit breaker is provided that includes primary and secondary paths that extend between first and second terminals. The primary path extends between the first and second terminals and through a first switch. The secondary path extends between the first and second terminals and through the second switch and a semiconductor switching element. During normal operation, a control system maintains the first and second switches in closed position and the semiconductor switching element in blocking state. When a fault condition occurs in the load current, the control system detects the fault condition and sets the semiconductor switching element to conducting state. The control system then sets the first switch to open position such that the load current flows between the first and second terminals through the secondary path. The control system then sets the second switch to open position and the semiconductor switching element to blocking state.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: August 26, 2014
    Assignee: Cree, Inc.
    Inventor: Robert J. Callanan
  • Publication number: 20140111246
    Abstract: A switching device driver, which includes switching circuitry and a first capacitive element, which is coupled to the switching circuitry, is disclosed. The switching circuitry receives a logic level input signal and provides a switching control output signal to a switching device based on the logic level input signal. When the logic level input signal has a first logic level, the switching circuitry charges the first capacitive element. When the logic level input signal transitions from the first logic level to a second logic level, the switching circuitry at least partially discharges the first capacitive element to rapidly transition the switching control output signal, thereby causing the switching device to quickly change states.
    Type: Application
    Filed: October 19, 2012
    Publication date: April 24, 2014
    Applicant: CREE, INC.
    Inventor: Robert J. Callanan
  • Publication number: 20130265084
    Abstract: A circuit, which includes a high voltage driver, is disclosed. The high voltage driver includes a P-type field effect transistor (PFET) and a source bias circuit. The source bias circuit receives a low voltage input signal and applies a direct current (DC) bias to the low voltage input signal to provide a DC biased signal. The PFET has a first source, a first gate, and a first drain. The first source receives the DC biased signal. The first gate receives a first low voltage DC supply signal. The first drain provides a high voltage output signal based on the DC biased signal and the first low voltage DC supply signal. In this regard, the high voltage driver receives and translates the low voltage input signal to provide the high voltage output signal.
    Type: Application
    Filed: April 4, 2012
    Publication date: October 10, 2013
    Applicant: CREE, INC.
    Inventor: Robert J. Callanan
  • Publication number: 20130248883
    Abstract: The present disclosure relates to a power module that has a housing with an interior chamber and a plurality of switch modules interconnected to facilitate switching power to a load. Each of the plurality of switch modules comprises at least one transistor and at least one diode mounted within the interior chamber and both the at least one transistor and the at least one diode are majority carrier devices, are formed of a wide bandgap material system, or both. The switching modules may be arranged in virtually any fashion depending on the application. For example, the switching modules may be arranged in a six-pack, full H-bridge, half H-bridge, single switch or the like.
    Type: Application
    Filed: May 14, 2013
    Publication date: September 26, 2013
    Applicant: Cree, Inc.
    Inventors: Mrinal K. Das, Robert J. Callanan, Henry Lin
  • Patent number: 8354690
    Abstract: Provided is a semiconductor bistable switching device that includes a thyristor portion including an anode layer, a drift layer, a gate layer and a cathode layer, the gate layer operable to receive a gate trigger current that, when the anode layer is positively biased relative to the cathode layer, causes the thyristor portion to latch into a conducting mode between the anode and the cathode. The device also includes a transistor portion formed on the thyristor portion, the transistor portion including a source, a drain and a transistor gate, the drain coupled to the cathode of the thyristor portion.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: January 15, 2013
    Assignee: Cree, Inc.
    Inventors: Robert J. Callanan, Sei-Hyung Ryu, Qingchun Zhang
  • Patent number: 8294507
    Abstract: An electronic device includes a wide bandgap thyristor having an anode, a cathode, and a gate terminal, and a wide bandgap bipolar transistor having a base, a collector, and an emitter terminal. The emitter terminal of the bipolar transistor is directly coupled to the anode terminal of the thyristor such that the bipolar transistor and the thyristor are connected in series. The bipolar transistor and the thyristor define a wide bandgap bipolar power switching device that is configured to switch between a nonconducting state and a conducting state that allows current flow between a first main terminal corresponding to the collector terminal of the bipolar transistor and a second main terminal corresponding to the cathode terminal of the thyristor responsive to application of a first control signal to the base terminal of the bipolar transistor and responsive to application of a second control signal to the gate terminal of the thyristor. Related control circuits are also discussed.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: October 23, 2012
    Assignee: Cree, Inc.
    Inventors: Qingchun Zhang, James Theodore Richmond, Robert J. Callanan
  • Publication number: 20120032727
    Abstract: A circuit breaker is provided that includes primary and secondary paths that extend between first and second terminals. The primary path extends between the first and second terminals and through a first switch. The secondary path extends between the first and second terminals and through the second switch and a semiconductor switching element. During normal operation, a control system maintains the first and second switches in closed position and the semiconductor switching element in blocking state. When a fault condition occurs in the load current, the control system detects the fault condition and sets the semiconductor switching element to conducting state. The control system then sets the first switch to open position such that the load current flows between the first and second terminals through the secondary path. The control system then sets the second switch to open position and the semiconductor switching element to blocking state.
    Type: Application
    Filed: August 4, 2010
    Publication date: February 9, 2012
    Applicant: Cree Inc.
    Inventor: Robert J. Callanan
  • Publication number: 20110049561
    Abstract: Provided is a semiconductor bistable switching device that includes a thyristor portion including an anode layer, a drift layer, a gate layer and a cathode layer, the gate layer operable to receive a gate trigger current that, when the anode layer is positively biased relative to the cathode layer, causes the thyristor portion to latch into a conducting mode between the anode and the cathode. The device also includes a transistor portion formed on the thyristor portion, the transistor portion including a source, a drain and a transistor gate, the drain coupled to the cathode of the thyristor portion.
    Type: Application
    Filed: August 31, 2009
    Publication date: March 3, 2011
    Inventors: Robert J. Callanan, Sei-Hyung Ryu, Qingchun Zhang
  • Publication number: 20100283529
    Abstract: An electronic device includes a wide bandgap thyristor having an anode, a cathode, and a gate terminal, and a wide bandgap bipolar transistor having a base, a collector, and an emitter terminal. The emitter terminal of the bipolar transistor is directly coupled to the anode terminal of the thyristor such that the bipolar transistor and the thyristor are connected in series. The bipolar transistor and the thyristor define a wide bandgap bipolar power switching device that is configured to switch between a nonconducting state and a conducting state that allows current flow between a first main terminal corresponding to the collector terminal of the bipolar transistor and a second main terminal corresponding to the cathode terminal of the thyristor responsive to application of a first control signal to the base terminal of the bipolar transistor and responsive to application of a second control signal to the gate terminal of the thyristor. Related control circuits are also discussed.
    Type: Application
    Filed: May 8, 2009
    Publication date: November 11, 2010
    Inventors: Qingchun Zhang, James Theodore Richmond, Robert J. Callanan
  • Patent number: 5747981
    Abstract: In one embodiment of the present invention, an inductor comprises a core defining a first electromagnetic path, a second electromagnetic path and a third electromagnetic path, the third electromagnetic path substantially closing the first and second electromagnetic paths. The inductor also includes a first electrical coil wound about at least a portion of the first electromagnetic path and a second electrical coil wound about at least a portion of the second electromagnetic path. Another embodiment of the present invention uses the inductor in an electrical system such as a DC-to-DC converter. Inductors constructed according to the present invention can be used to provide "common mode" inductance and "differential mode" inductance in a single inductor.
    Type: Grant
    Filed: December 2, 1996
    Date of Patent: May 5, 1998
    Assignee: Ford Motor Company
    Inventor: Robert J. Callanan