Patents by Inventor Trevor W. Barcelo
Trevor W. Barcelo 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: 11557981Abstract: An ideal diode circuit is described which uses an NMOS transistor as a low-loss ideal diode. The control circuit for the transistor is referenced to the anode voltage and not to ground, so the control circuitry may be low voltage circuitry, even if the input voltage is very high, referenced to earth ground. A capacitor is clamped to about 10-20 V, referenced to the anode voltage. The clamped voltage powers a differential amplifier for the detecting if the anode voltage is greater than the cathode voltage. The capacitor is charged to the clamped voltage during normal operation of the ideal diode by controlling the conductivity of a second transistor coupled between the cathode and the capacitor, enabling the circuit to be used with a wide range of frequencies and voltages. All voltages applied to the differential amplifier are equal to or less than the clamped voltage.Type: GrantFiled: November 2, 2020Date of Patent: January 17, 2023Assignee: Analog Devices International Unlimited CompanyInventors: Jeffrey Lynn Heath, Trevor W. Barcelo
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Patent number: 11469223Abstract: A current monitor circuit comprises a sense transistor disposed in a first voltage domain; a reference transistor disposed in a second voltage domain isolated from the first voltage domain; and sensing circuitry configured to determine if a current in the sense transistor is greater than or less than a specified current using a current in the reference transistor.Type: GrantFiled: April 28, 2020Date of Patent: October 11, 2022Assignee: Analog Devices International Unlimited CompanyInventors: David F. Schneider, Trevor W. Barcelo
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Publication number: 20210111640Abstract: An ideal diode circuit is described which uses an NMOS transistor as a low-loss ideal diode. The control circuit for the transistor is referenced to the anode voltage and not to ground, so the control circuitry may be low voltage circuitry, even if the input voltage is very high, referenced to earth ground. A capacitor is clamped to about 10-20V, referenced to the anode voltage. The clamped voltage powers a differential amplifier for the detecting if the anode voltage is greater than the cathode voltage. The capacitor is charged to the clamped voltage during normal operation of the ideal diode by controlling the conductivity of a second transistor coupled between the cathode and the capacitor, enabling the circuit to be used with a wide range of frequencies and voltages. All voltages applied to the differential amplifier are equal to or less than the clamped voltage.Type: ApplicationFiled: November 2, 2020Publication date: April 15, 2021Inventors: Jeffrey Lynn Heath, Trevor W. Barcelo
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Publication number: 20200381418Abstract: A current monitor circuit comprises a sense transistor disposed in a first voltage domain; a reference transistor disposed in a second voltage domain isolated from the first voltage domain; and sensing circuitry configured to determine if a current in the sense transistor is greater than or less than a specified current using a current in the reference transistor.Type: ApplicationFiled: April 28, 2020Publication date: December 3, 2020Inventors: David F. Schneider, Trevor W. Barcelo
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Patent number: 8664920Abstract: An apparatus and method for charging a battery includes a battery to be charged, a power delivery path configured for delivering power to the battery, and an integrated switching battery charger configured for charging a battery by delivering output power to the battery via the power delivery path based on input power from an input power source. The integrated switching battery charger includes an output voltage regulation loop and an input voltage regulation loop, both of which are configured to control the output current flowing out of the integrated switching battery charger to the battery. The input or output voltage regulation loops are further enhanced by adding a current source which is proportional to absolute temperature from the regulated voltage to the control voltage for the purpose of either regulating peak power from the source or to maximize energy storage in the battery as a function of temperature.Type: GrantFiled: August 24, 2012Date of Patent: March 4, 2014Assignee: Linear Technology CorporationInventors: Jonathan Wayde Celani, Brian James Shaffer, Trevor W. Barcelo
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Publication number: 20130057225Abstract: An apparatus and method for charging a battery includes a battery to be charged, a power delivery path configured for delivering power to the battery, and an integrated switching battery charger configured for charging a battery by delivering output power to the battery via the power delivery path based on input power from an input power source. The integrated switching battery charger includes an output voltage regulation loop and an input voltage regulation loop, both of which are configured to control the output current flowing out of the integrated switching battery charger to the battery. The input or output voltage regulation loops are further enhanced by adding a current source which is proportional to absolute temperature from the regulated voltage to the control voltage for the purpose of either regulating peak power from the source or to maximize energy storage in the battery as a function of temperature.Type: ApplicationFiled: August 24, 2012Publication date: March 7, 2013Inventors: Jonathan Wayde CELANI, Brian James SHAFFER, Trevor W. BARCELO
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Patent number: 7710079Abstract: A power manager is configured to manage power for a battery-powered application. A power source, a load and a battery are interconnected through a circuit path. Power from the power source is provided to the load and battery by a switching regulator. Various implementations are presented.Type: GrantFiled: July 19, 2005Date of Patent: May 4, 2010Assignee: Linear Technology CorporationInventors: Steven L. Martin, Trevor W. Barcelo, Samuel H. Nork, Roger A. Zemke, David J. Simmons
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Patent number: 6819094Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: GrantFiled: November 17, 2003Date of Patent: November 16, 2004Assignee: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Publication number: 20040100243Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: ApplicationFiled: November 17, 2003Publication date: May 27, 2004Applicant: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Patent number: 6700364Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: GrantFiled: May 21, 2003Date of Patent: March 2, 2004Assignee: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Publication number: 20030197497Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: ApplicationFiled: May 21, 2003Publication date: October 23, 2003Applicant: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Patent number: 6570372Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: GrantFiled: March 27, 2002Date of Patent: May 27, 2003Assignee: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Patent number: 6522118Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: GrantFiled: April 18, 2001Date of Patent: February 18, 2003Assignee: Linear Technology CorporationInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Publication number: 20020153871Abstract: Methods and circuits implementing a constant-current/constant-voltage circuit architecture are provided. The methods and circuits preferably provide a charging system that provides current to a load using a fixed current until the load is charged. When the load is charged, the methods and circuits preferably provide a variable current to the load in order to maintain the voltage level across the load. This variable current varies according to the voltage across the load. In one embodiment of the invention, a constant power current may also be used as one of the load charging currents. The constant power current may act as a limit on the charging circuit's power output.Type: ApplicationFiled: March 27, 2002Publication date: October 24, 2002Applicant: Linear TechnologyInventors: Trevor W. Barcelo, Robert L. Reay, David M. Dwelley
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Patent number: 6404251Abstract: A linear pulse-width modulator system is provided. The pulse-width modulation system of the present invention provides a pulse-width modulated (PWM) signal from a control voltage. The PWM signal varies linearly with the control voltage over a full range of duty cycles. The pulse width modulation system of the present invention has as plurality of comparators, each having one input coupled to a control voltage and a second input coupled to a periodic waveform signal provide by a waveform generator. The periodic waveform signals are identical except that each waveform is time delayed with respect to the other waveform signals. The outputs the comparators are coupled to a multiplexer which selects the output of each comparator as the PWM signal for a time interval corresponding to when the output signal of the comparator has substantially constant propagation delays.Type: GrantFiled: March 27, 2000Date of Patent: June 11, 2002Assignee: Linear Technology CorporationInventors: David M. Dwelley, Trevor W. Barcelo
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Patent number: 6166527Abstract: A high efficiency control circuit for operating a buck-boost switching regulator is provided. The switching regulator can regulate an output voltage higher, lower, or the same as the input voltage. The switching regulator may be synchronous or non-synchronous. The control circuit can operate the switching regulator in buck mode, boost mode, or buck-boost mode. In buck mode, the switching regulator regulates an output voltage that is less than the input voltage. In boost mode, the switching regulator regulates an output voltage that is greater than the input voltage. In buck and boost modes, less than all of the switches are switched ON and OFF to regulate the output voltage to conserve power. In buck-boost mode, all of the switches switch ON and OFF to regulate the output voltage to a value that is greater than, less than, or equal to the input voltage.Type: GrantFiled: March 27, 2000Date of Patent: December 26, 2000Assignee: Linear Technology CorporationInventors: David M. Dwelley, Trevor W. Barcelo