Patents by Inventor Marcelo de Paula Campos
Marcelo de Paula Campos 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: 10061339Abstract: A circuit includes first, second, and third power supply terminals. The circuit includes an input node coupled to receive a negative voltage and an output node coupled to provide a positive voltage proportional to the negative voltage. The circuit includes a voltage-to-current converter coupled to the first power supply terminal and the input node and configured to generate an intermediate current proportional to the negative voltage at the input node. The circuit also includes a current mirror coupled to the second power supply terminal and third power supply terminal and configured to mirror the intermediate current through a first resistor to provide the positive proportional voltage.Type: GrantFiled: November 3, 2017Date of Patent: August 28, 2018Assignee: NXP USA, Inc.Inventors: Andre Luis Vilas Boas, Richard Titov Lara Saez, Ivan Carlos Ribeiro Do Nascimento, Marcelo de Paula Campos, Pedro Barbosa Zanetta
-
Patent number: 9774258Abstract: Systems and methods for zero-current crossing detection circuits. In some embodiments, a circuit may include a buck converter comprising a high-side switch, a low-side switch, and an inductor; a zero-current crossing detection circuit comprising a reference switch coupled to a current source, where the reference switch is controllable conjointly with the low-side switch; an amplifier coupled to: (a) a first node between the current source and reference switch, where in operation the first node has a positive voltage value during an interval of interest, and a (b) second node between the low-side switch and the inductor, where in operation the second node has a negative voltage value during the interval of interest; and a comparator coupled to the amplifier, the comparator configured to output a flag in response to a detection that a decreasing current through the inductor has reached a predetermined value.Type: GrantFiled: August 10, 2015Date of Patent: September 26, 2017Assignee: NXP USA, Inc.Inventor: Marcelo de Paula Campos
-
Publication number: 20170047840Abstract: Systems and methods for zero-current crossing detection circuits. In some embodiments, a circuit may include a buck converter comprising a high-side switch, a low-side switch, and an inductor; a zero-current crossing detection circuit comprising a reference switch coupled to a current source, where the reference switch is controllable conjointly with the low-side switch; an amplifier coupled to: (a) a first node between the current source and reference switch, where in operation the first node has a positive voltage value during an interval of interest, and a (b) second node between the low-side switch and the inductor, where in operation the second node has a negative voltage value during the interval of interest; and a comparator coupled to the amplifier, the comparator configured to output a flag in response to a detection that a decreasing current through the inductor has reached a predetermined value.Type: ApplicationFiled: August 10, 2015Publication date: February 16, 2017Inventor: Marcelo de Paula Campos
-
Publication number: 20160173076Abstract: Systems and methods for production test trimming acceleration. In an illustrative, non-limiting embodiment, a method may include providing a first trim code to a reference circuit, where the reference circuit is configured to output a first signal in response to the first trim code; integrating a difference between the first signal and a target voltage value into a first integrated value; providing a second trim code to the reference circuit, where the reference circuit is configured to output a second signal in response to the second trim code; integrating a difference between the second signal and the target voltage value into a second integrated value; and adjusting at least one of the first or second trim codes in response to a comparison between the first and second integrated values.Type: ApplicationFiled: December 16, 2014Publication date: June 16, 2016Inventors: Edevaldo Pereira da Silva, JR., Joe Chayachinda, Ricardo P. Coimbra, Marcelo de Paula Campos
-
Patent number: 9356590Abstract: Systems and methods for production test trimming acceleration. In an illustrative, non-limiting embodiment, a method may include providing a first trim code to a reference circuit, where the reference circuit is configured to output a first signal in response to the first trim code; integrating a difference between the first signal and a target voltage value into a first integrated value; providing a second trim code to the reference circuit, where the reference circuit is configured to output a second signal in response to the second trim code; integrating a difference between the second signal and the target voltage value into a second integrated value; and adjusting at least one of the first or second trim codes in response to a comparison between the first and second integrated values.Type: GrantFiled: December 16, 2014Date of Patent: May 31, 2016Assignee: Freescale Semiconductor, Inc.Inventors: Edevaldo Pereira da Silva, Jr., Joe Chayachinda, Ricardo P. Coimbra, Marcelo de Paula Campos
-
Patent number: 8928231Abstract: A fault-tolerant controller for a lighting system comprising: a plurality of light emitting diode (LED) circuits and a controllable power source to power the plurality of LED circuits. The controller comprising a minimum voltage selector to determine a minimum voltage from a plurality of feedback voltages, one feedback voltage for each of the plurality of LED circuits. A control logic to regulate the drive voltage for the LEDs; and an overvoltage warning mechanism to determine an overvoltage of the drive voltage. The controller identifies one or more open-circuit conditions, one for each LED circuit, for which the respective feedback voltage is below an open-circuit threshold, and which causes the minimum voltage selector to exclude one or more respective feedback voltages associated with the LED circuits which have an open-circuit condition.Type: GrantFiled: August 6, 2012Date of Patent: January 6, 2015Assignee: Dialog Semiconductor GmbhInventors: Marcelo De Paula Campos, Stefano Scaldaferri
-
Publication number: 20130140990Abstract: A fault-tolerant controller for a lighting system comprising: a plurality of light emitting diode (LED) circuits and a controllable power source to power the plurality of LED circuits. The controller comprising a minimum voltage selector to determine a minimum voltage from a plurality of feedback voltages, one feedback voltage for each of the plurality of LED circuits. A control logic to regulate the drive voltage for the LEDs; and an overvoltage warning mechanism to determine an overvoltage of the drive voltage. The controller identifies one or more open-circuit conditions, one for each LED circuit, for which the respective feedback voltage is below an open-circuit threshold, and which causes the minimum voltage selector to exclude one or more respective feedback voltages associated with the LED circuits which have an open-circuit condition.Type: ApplicationFiled: August 6, 2012Publication date: June 6, 2013Applicant: DIALOG SEMICONDUCTOR GMBHInventors: Marcelo De Paula Campos, Stefano Scaldaferri
-
Patent number: 8398304Abstract: A device includes a current source circuit to separately provide a first current and a second current and a thermal detection device coupleable to the output of the current source circuit. The device further includes a voltage detection circuit to provide a first indicator of a first voltage representative of a voltage at the thermal detection device in response to the second current and a second indicator of a second voltage representative of a voltage difference between the voltage at the thermal detection device in response to the second current and a voltage at the voltage detection device in response to the first current. The device further includes a temperature detection circuit to provide an over-temperature indicator based on the first indicator and the second indicator, wherein an operation of a circuit component of the device can be adjusted based on the over-temperature indicator.Type: GrantFiled: January 5, 2011Date of Patent: March 19, 2013Assignee: Freescale Semiconductor, Inc.Inventors: Marcelo de Paula Campos, Edevaldo Pereira da Silva, Jr., Ivan Carlos Ribeiro do Nascimento
-
Publication number: 20110096809Abstract: A device includes a current source circuit to separately provide a first current and a second current and a thermal detection device coupleable to the output of the current source circuit. The device further includes a voltage detection circuit to provide a first indicator of a first voltage representative of a voltage at the thermal detection device in response to the second current and a second indicator of a second voltage representative of a voltage difference between the voltage at the thermal detection device in response to the second current and a voltage at the voltage detection device in response to the first current. The device further includes a temperature detection circuit to provide an over-temperature indicator based on the first indicator and the second indicator, wherein an operation of a circuit component of the device can be adjusted based on the over-temperature indicator.Type: ApplicationFiled: January 5, 2011Publication date: April 28, 2011Applicant: FREESCALE SEMICONDUCTOR, INC.Inventors: Marcelo de Paula Campos, Edevaldo Pereira da Silva Junior, Ivan Carlos Ribeiro do Nascimento
-
Patent number: 7887235Abstract: A device includes a current source circuit to separately provide a first current and a second current and a thermal detection device coupleable to the output of the current source circuit. The device further includes a voltage detection circuit to provide a first indicator of a first voltage representative of a voltage at the thermal detection device in response to the second current and a second indicator of a second voltage representative of a voltage difference between the voltage at the thermal detection device in response to the second current and a voltage at the voltage detection device in response to the first current. The device further includes a temperature detection circuit to provide an over-temperature indicator based on the first indicator and the second indicator, wherein an operation of a circuit component of the device can be adjusted based on the over-temperature indicator.Type: GrantFiled: August 30, 2006Date of Patent: February 15, 2011Assignee: Freescale Semiconductor, Inc.Inventors: Marcelo de Paula Campos, Edevaldo Pereira da Silva Junior, Ivan Carlos Ruberio do Nascimento
-
Publication number: 20080123238Abstract: A device includes a current source circuit to separately provide a first current and a second current and a thermal detection device coupleable to the output of the current source circuit. The device further includes a voltage detection circuit to provide a first indicator of a first voltage representative of a voltage at the thermal detection device in response to the second current and a second indicator of a second voltage representative of a voltage difference between the voltage at the thermal detection device in response to the second current and a voltage at the voltage detection device in response to the first current. The device further includes a temperature detection circuit to provide an over-temperature indicator based on the first indicator and the second indicator, wherein an operation of a circuit component of the device can be adjusted based on the over-temperature indicator.Type: ApplicationFiled: August 30, 2006Publication date: May 29, 2008Applicant: Freescale Semiconductor, Inc.Inventors: Marcelo de Paula Campos, Edevaldo Pereira da Silva Junior, Ivan Carlos Ribeiro do Nascimento