Patents by Inventor Talbott M. Houk
Talbott M. Houk 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: 20240077932Abstract: The present disclosure describes a system with a power management device, a wakeup circuit, a battery management device, and a connector. During a powered down mode of operation, the battery management device can provide, via the connector, a bias voltage to the wakeup circuit. In response to a wakeup switch being activated, the battery management device can provide a power supply (e.g., from a battery) to the power management device. Benefits of the wakeup circuit include (1) a reduction of battery consumption—and thus improving battery lifetime—when the electronic system is in a powered down mode of operation because the wakeup circuit has lower number of active components compared to other designs and (2) a non-complex wakeup circuit design because one or more existing connector interconnects between the power management device and the battery management device can be re-used during electronic system's powered down mode of operation.Type: ApplicationFiled: March 16, 2023Publication date: March 7, 2024Applicant: Apple Inc.Inventors: Talbott M. Houk, Wenxun Huang, Nikola Jovanovic, Floyd L. Dankert, Sanjay Pant, Alessandro Molari, Siarhei Meliukh, Nicola Florio, Ludmil N. Nikolov, Nathan F. Hanagami, Hartmut Sturm, Di Zhao, Chad L. Olson, John J. Sullivan, Seyedeh Maryam Mortazavi Zanjani, Tristan R. Hudson, Jay B. Fletcher, Jonathan A. Dutra
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Patent number: 10581330Abstract: A power conversion circuit providing a regulated output voltage to a load can include a switching regulator with an input configured to be coupled to an input voltage source and an output configured to be coupled to the load. The power conversion circuit can further include a metered charge transfer converter, such as a charge pump or a switched or pulsed current source, having an input configured to be coupled to an input voltage source and having an output configured to be coupled to the load. A controller coupled to the metered charge transfer converter can be configured to operate the metered charge transfer converter to deliver energy to the load responsive to a dip of the regulated output voltage below a threshold caused by an increase in current drawn by the load. The metered charge transfer converter may be located closer to the load than the switching regulator.Type: GrantFiled: June 7, 2018Date of Patent: March 3, 2020Assignee: Apple Inc.Inventors: Damon Lee, Jamie L. Langlinais, Jonathan M. Audy, Mark A. Yoshimoto, Rajarshi Paul, Talbott M. Houk
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Publication number: 20190280590Abstract: A power conversion circuit providing a regulated output voltage to a load can include a switching regulator with an input configured to be coupled to an input voltage source and an output configured to be coupled to the load. The power conversion circuit can further include a metered charge transfer converter, such as a charge pump or a switched or pulsed current source, having an input configured to be coupled to an input voltage source and having an output configured to be coupled to the load. A controller coupled to the metered charge transfer converter can be configured to operate the metered charge transfer converter to deliver energy to the load responsive to a dip of the regulated output voltage below a threshold caused by an increase in current drawn by the load. The metered charge transfer converter may be located closer to the load than the switching regulator.Type: ApplicationFiled: June 7, 2018Publication date: September 12, 2019Inventors: Damon Lee, Jamie L. Langlinais, Jonathan M. Audy, Mark A. Yoshimoto, Rajarshi Paul, Talbott M. Houk
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Patent number: 10305305Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for providing a charger capable of adaptively handling a range of power inputs. The charger can selectively activate different control switches within the charger in order to more efficiently use current supplied to the charger. When a low power input is provided to the charger, the charger can reduce the number of active control switches being used to provide a voltage output from the charger. In this way, the capacitance required to toggle the control switches can be reduced. When a high power input is provided to the charger, the number of active control switches can be increased in order to increase a total amount of charge that can be provided from the charger, thereby reducing charge times for batteries.Type: GrantFiled: September 9, 2016Date of Patent: May 28, 2019Assignee: Apple Inc.Inventors: Mark A. Yoshimoto, Talbott M. Houk, Jamie L. Langlinais
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Patent number: 9923468Abstract: A power conversion circuit has multiple phases wherein each of the phases has an inductor coupled to a power switch circuit and is coupled to an output node. A power conversion controller controls the switching of one or more of the phases to yield a regulated voltage on the output node. The controller uses a variable inductor current limit for one or more designated phases, and temporarily increases the variable inductor current limit during a transient condition. Other embodiments are also described and claimed.Type: GrantFiled: March 31, 2015Date of Patent: March 20, 2018Assignee: Apple Inc.Inventors: Rajarshi Paul, Parin Patel, Talbott M. Houk
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Publication number: 20170063122Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for providing a charger capable of adaptively handling a range of power inputs. The charger can selectively activate different control switches within the charger in order to more efficiently use current supplied to the charger. When a low power input is provided to the charger, the charger can reduce the number of active control switches being used to provide a voltage output from the charger. In this way, the capacitance required to toggle the control switches can be reduced. When a high power input is provided to the charger, the number of active control switches can be increased in order to increase a total amount of charge that can be provided from the charger, thereby reducing charge times for batteries.Type: ApplicationFiled: September 9, 2016Publication date: March 2, 2017Inventors: Mark A. YOSHIMOTO, Talbott M. HOUK, Jamie L. LANGLINAIS
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Patent number: 9444281Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for providing a charger capable of adaptively handling a range of power inputs. The charger can selectively activate different control switches within the charger in order to more efficiently use current supplied to the charger. When a low power input is provided to the charger, the charger can reduce the number of active control switches being used to provide a voltage output from the charger. In this way, the capacitance required to toggle the control switches can be reduced. When a high power input is provided to the charger, the number of active control switches can be increased in order to increase a total amount of charge that can be provided from the charger, thereby reducing charge times for batteries.Type: GrantFiled: November 11, 2014Date of Patent: September 13, 2016Assignee: Apple Inc.Inventors: Mark A. Yoshimoto, Talbott M. Houk, Jamie L. Langlinais
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Publication number: 20150288285Abstract: A power conversion circuit has multiple phases wherein each of the phases has an inductor coupled to a power switch circuit and is coupled to an output node. A power conversion controller controls the switching of one or more of the phases to yield a regulated voltage on the output node. The controller uses a variable inductor current limit for one or more designated phases, and temporarily increases the variable inductor current limit during a transient condition. Other embodiments are also described and claimed.Type: ApplicationFiled: March 31, 2015Publication date: October 8, 2015Inventors: Rajarshi Paul, Parin Patel, Talbott M. Houk
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Publication number: 20150194821Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for providing a charger capable of adaptively handling a range of power inputs. The charger can selectively activate different control switches within the charger in order to more efficiently use current supplied to the charger. When a low power input is provided to the charger, the charger can reduce the number of active control switches being used to provide a voltage output from the charger. In this way, the capacitance required to toggle the control switches can be reduced. When a high power input is provided to the charger, the number of active control switches can be increased in order to increase a total amount of charge that can be provided from the charger, thereby reducing charge times for batteries.Type: ApplicationFiled: November 11, 2014Publication date: July 9, 2015Inventors: Mark A. YOSHIMOTO, Talbott M. HOUK, Jamie L. LANGLINAIS
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Patent number: 7714550Abstract: An analog control circuit is coupled to an apparatus having a variable characteristic over an operating range. A sensing circuit is coupled to the apparatus and the control circuit during the range of operation of the apparatus and is operative to sense the variable characteristic. The operating parameter of the apparatus is controlled to be set at a level corresponding to a prescribed criterion, which may be a maximum or minimum, of the characteristic sensed over the range of operation.Type: GrantFiled: October 20, 2005Date of Patent: May 11, 2010Assignee: Linear Technology CorporationInventors: Talbott M. Houk, Joseph Duncan, Eugene L. Cheung
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Patent number: 7019507Abstract: The present invention provides methods and circuits for protecting power converters from over-current conditions that, in one embodiment, (1) reduce average inductor current to a steady-state threshold during a transient phase and regulate average inductor current in steady-state regulation approximately at the steady-state threshold; and (2) reduce instantaneous inductor current after the instantaneous inductor current exceeds a maximum instantaneous threshold during the transient phase.Type: GrantFiled: November 26, 2003Date of Patent: March 28, 2006Assignee: Linear Technology CorporationInventors: Gregory P. Dittmer, Talbott M. Houk
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Patent number: 6331755Abstract: A circuit which detects near or below resonance operation of a fluorescent lamp being driven with a half-bridge circuit and which deactivates the half-bridge circuit before any damage to the circuit can result. In the circuit of the present invention, the voltage across a sense resistor disposed either the lower transistor switch and ground, or between the lower lamp filament and ground, is compared against a predetermined reference voltage to generate an output comparison signal. The output comparison signal is gated to the turn-off edge of the lower MOSFET (in the case of the sense resistor disposed between the lower MOSFET and ground) or to the turn-off edge of the upper MOSFET (in the case of the sense resistor between the lower lamp filament and ground) to generate a signal for shutting down the half-bridge circuit in the event of near or below resonance operation of the lamp resonant circuit.Type: GrantFiled: June 10, 1998Date of Patent: December 18, 2001Assignee: International Rectifier CorporationInventors: Thomas J. Ribarich, Talbott M. Houk
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Patent number: 6211623Abstract: A ballast controller integrated circuit which executes a specific set of instructions via an integrated state diagram architecture to control the fluorescent lamp and protect the ballast. The state diagram architecture controls powering up and down of the IC and the half-bridge circuit driven by the IC, preheating and striking of the lamp, running of the lamp, sensing for numerous possible fault conditions, and recovering from these fault conditions based on the normal maintenance of a lamp.Type: GrantFiled: January 5, 1999Date of Patent: April 3, 2001Assignee: International Rectifier CorporationInventors: Dana S. Wilhelm, Talbott M. Houk, Thomas J. Ribarich
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Patent number: 6005354Abstract: A MOS gate drive (MGD) integrated circuit drives a pair of MOS gated power semiconductor devices such as are used in a half bridge circuit to drive a load in a resonant power supply circuit or to drive a gas discharge lamp in a ballast circuit. The gate drive circuit includes a protection circuit which protects against damage to the components of the driver circuit when a lamp fails or is removed by disabling both of the driver outputs. When the lamp is replaced, the gate drive circuit restarts the lamp driver circuit without cycling the lamp power switch. The protection circuit disables the driver outputs when a low logic level signal falls below a threshold voltage. The lamp driver circuit is restarted when the low logic level signal exceeds the threshold voltage.Type: GrantFiled: August 6, 1997Date of Patent: December 21, 1999Assignee: International Rectifier CorporationInventor: Talbott M. Houk
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Patent number: 5973943Abstract: A protection circuit for preventing non zero-voltage switching of a lamp resonant output circuit driven by upper and lower half-bridge switches. The protection circuit includes a sense resistor disposed between the lower half bridge switch and ground for developing a voltage corresponding to the current flowing through the lower switch. A comparator compares the voltage developed across the sense resistor against a fixed reference voltage and generates an output indicative of a non zero-voltage switching condition when the voltage across the sense resistor exceeds the fixed reference voltage. A latch is connected to the output of the comparator and generates a latch output signal which disables the generation of drive signals to the upper and lower switches in the event of a non zero-voltage switch condition.Type: GrantFiled: July 27, 1998Date of Patent: October 26, 1999Assignee: International Rectifier CorporationInventors: Thomas J. Ribarich, Talbott M. Houk
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Patent number: 5812010Abstract: A circuit for and a method of driving first and second power transistors arranged in series in a half-bridge configuration provides for soft turn-on of the power transistors when there is a change of state in the input voltage. When the input voltage initially changes state, the gate drive voltage of one of the power transistors is raised to a voltage barely above its threshold value for a predetermined interval. The gate drive voltage of this power transistor is then raised to the supply voltage value. When the input voltage again changes state, the transistor is turned off, and the other transistor is turned on in a similar manner. As a result, when one of the transistors is turned on, current transients in the other transistor is reduced.Type: GrantFiled: September 9, 1996Date of Patent: September 22, 1998Assignee: International Rectifier CorporationInventor: Talbott M. Houk
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Patent number: 5747943Abstract: A monolithic MOS gate driver chip is described for driving high side and low side power MOSFETs in a gas discharge lamp ballast circuit. The chip includes a timer circuit for generating a square output at the natural frequency of resonance of the lamp ballast. Dead time circuits are provided in the chip to prevent the simultaneous conduction of both high side and low side MOSFETs. The chip may be housed in an eight pin DIP package.Type: GrantFiled: August 26, 1996Date of Patent: May 5, 1998Assignee: International Rectifier CorporationInventors: Talbott M. Houk, Peter N. Wood
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Patent number: 5550436Abstract: A monolithic MOS gate driver chip is described for driving high side and low side power MOSFETs in a gas discharge lamp ballast circuit. The chip includes a timer circuit for generating a square output at the natural frequency of resonance of the lamp ballast. Dead time circuits are provided in the chip to prevent the simultaneous conduction of both high side and low side MOSFETs. The chip may be housed in an eight pin DIP package.Type: GrantFiled: September 1, 1994Date of Patent: August 27, 1996Assignee: International Rectifier CorporationInventor: Talbott M. Houk
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Patent number: 5550701Abstract: An NPN transistor is added to the chip of a power integrated circuit which contains a power MOSFET and a control circuit in a common chip. The NPN transistor is coupled between the P well containing the integrated circuit components and the N type substrate of the chip and is turned on in response to the forward biasing of the body diode Of the power MOSFET. A depletion mode control MOSFET transistor is coupled, through a fault latch circuit, to the power MOSFET gate and is in series with a capacitor. The node between the power MOSFET gate and capacitor is decoupled from the N type substrate when the bipolar transistor turns on, to turn off the power MOSFET.Type: GrantFiled: August 30, 1994Date of Patent: August 27, 1996Assignee: International Rectifier CorporationInventors: Bruno C. Nadd, Talbott M. Houk
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Patent number: 5543994Abstract: The fault latch and filter circuit used in a MOSgated driver for a high side power MOSgated device to turn off the MOSgated device high side output in response to a given fault condition is located in the high side of the circuit and in a floating well of a semiconductor chip containing the driver circuit. The fault latch and filter are connected to the output driver circuit through a gate which also receives the high side filter and latch which are operated by the input control logic circuits through a level-shift up circuit. The fault latch circuit has an output which is level-shifted down by a single PMOS device to a fault reporting latch circuit on the low side of the device.Type: GrantFiled: February 27, 1995Date of Patent: August 6, 1996Assignee: International Rectifier CorporationInventors: Dana Wilhelm, Talbott M. Houk