Patents by Inventor Osvaldo Enrico Zambetti

Osvaldo Enrico Zambetti 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).

  • Publication number: 20200244155
    Abstract: An electronic converter includes first and second inputs, first and second outputs, and a switching cell configured to supply current. The switching cell includes a half-bridge including first and second switches connected in series between the two inputs. The half-bridge includes a intermediate point between the first and second switch, a first inductor directly connected to the first output, a second inductor connected to the intermediate point, a first capacitor connected in series with the first and second inductors, a second capacitor connected between the intermediate point and the second input, and a circuit connected between a terminal of the first inductor and the second output. A circuit path of the converter is configured to couple the second inductor with the first output through the first capacitor and the first inductor, and another circuit path is configured to couple the second capacitor with the first output through the first inductor.
    Type: Application
    Filed: April 17, 2020
    Publication date: July 30, 2020
    Inventor: Osvaldo Enrico Zambetti
  • Publication number: 20200177083
    Abstract: A converter includes two switching stages coupled in series between positive and negative input terminals. A control circuit is configured for driving the switching stages based on an output voltage of the converter. A first switching stage includes two switches coupled in series between a positive input terminal and a first node. A capacitor and an inductor are coupled in series between the two switches and a positive output terminal. A third switch is coupled between a node between the capacitor and the inductor and the negative input terminal. A second capacitor is coupled between the first node and the negative input terminal. A second switching stage includes a second node coupled to the first node. Two additional electronic switches are coupled in series between the second node and the negative input terminal. A second inductor is coupled between the two additional switches and the positive output terminal.
    Type: Application
    Filed: November 11, 2019
    Publication date: June 4, 2020
    Inventor: Osvaldo Enrico Zambetti
  • Patent number: 10658918
    Abstract: A switching cell includes: a half-bridge circuit including a first electronic switch and a second electronic switch connected in series between a first input terminal and a second input terminal of an electronic converter, wherein a first capacitor is connected in parallel to the first electronic switch and a second capacitor is connected in parallel to the second electronic switch; a first inductor connected between a first output terminal of the electronic converter and an intermediate point between the first electronic switch and the second electronic switch; a second inductor and a first capacitor connected in series between a first terminal of the first inductor and the intermediate point; a switching circuit connected between the first terminal of the first inductor and a second output terminal of the electronic converter; and a third capacitance connected between the first terminal of the first inductor and the second input terminal.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: May 19, 2020
    Assignee: STMICROELECTRONICS S.R.L.
    Inventor: Osvaldo Enrico Zambetti
  • Publication number: 20190052165
    Abstract: A switching cell includes: a half-bridge circuit including a first electronic switch and a second electronic switch connected in series between a first input terminal and a second input terminal of an electronic converter, wherein a first capacitor is connected in parallel to the first electronic switch and a second capacitor is connected in parallel to the second electronic switch; a first inductor connected between a first output terminal of the electronic converter and an intermediate point between the first electronic switch and the second electronic switch; a second inductor and a first capacitor connected in series between a first terminal of the first inductor and the intermediate point; a switching circuit connected between the first terminal of the first inductor and a second output terminal of the electronic converter; and a third capacitance connected between the first terminal of the first inductor and the second input terminal.
    Type: Application
    Filed: July 27, 2018
    Publication date: February 14, 2019
    Inventor: Osvaldo Enrico Zambetti
  • Patent number: 10164542
    Abstract: A converter includes first and second input terminals and first and second output terminals. The converter also includes an output capacitor coupled between the first output terminal and the second output terminal, and a magnetic component having two input terminals and three output terminals. A first output terminal of the magnetic component is coupled through a first electronic switch to the second output terminal of the converter, a second output terminal of the magnetic component is coupled to the first output terminal of the converter, and a third output terminal of the magnetic component is coupled through a second electronic switch to the second output terminal of the electronic converter. In addition, the converter includes a switching stage configured to transfer current pulses from the first input terminal and the second input terminal of the converter to the two input terminals of the magnetic component.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: December 25, 2018
    Assignee: STMicroelectronics S.r.l.
    Inventors: Stefano Saggini, Osvaldo Enrico Zambetti, Alessandro Zafarana
  • Patent number: 9780649
    Abstract: A method is provided for controlling a converter of the multiphase interleaving type. According to the method, there is detected when a change of the load applied to an output terminal of the converter occurs. All the phases of the converter are simultaneously turned off, and a driving interleaving phase shift is recovered so as to restart a normal operation of the converter. A controller for carrying out such a method is also provided.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: October 3, 2017
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Alessandro Zafarana, Osvaldo Enrico Zambetti
  • Publication number: 20170019032
    Abstract: A converter includes first and second input terminals and first and second output terminals. The converter also includes an output capacitor coupled between the first output terminal and the second output terminal, and a magnetic component having two input terminals and three output terminals. A first output terminal of the magnetic component is coupled through a first electronic switch to the second output terminal of the converter, a second output terminal of the magnetic component is coupled to the first output terminal of the converter, and a third output terminal of the magnetic component is coupled through a second electronic switch to the second output terminal of the electronic converter. In addition, the converter includes a switching stage configured to transfer current pulses from the first input terminal and the second input terminal of the converter to the two input terminals of the magnetic component.
    Type: Application
    Filed: April 21, 2016
    Publication date: January 19, 2017
    Inventors: Stefano SAGGINI, Osvaldo Enrico Zambetti, Alessandro Zafarana
  • Patent number: 9537409
    Abstract: A resonant converter includes a primary switching circuit having a primary winding and a primary switching stage configured to drive the primary winding; a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, a resonance capacitor connected in parallel to the secondary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the resonance capacitor; a rectification stage connected in parallel with the resonance capacitor, and having first and second switches coupled to form a half-bridge; and a feedback command circuit. The command circuit is configured to receive feedback signals representing an output voltage and an output current at the output terminal of the resonant converter, receive voltages at the terminals of the resonance capacitor, and turn on/off, independently with respect to each other, the switches of the rectification stage and the primary switching stage.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: January 3, 2017
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Stefano Saggini
  • Publication number: 20160276942
    Abstract: A resonant converter includes a primary switching circuit having a primary winding and a primary switching stage configured to drive the primary winding; a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, a resonance capacitor connected in parallel to the secondary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the resonance capacitor; a rectification stage connected in parallel with the resonance capacitor, and having first and second switches coupled to form a half-bridge; and a feedback command circuit. The command circuit is configured to receive feedback signals representing an output voltage and an output current at the output terminal of the resonant converter, receive voltages at the terminals of the resonance capacitor, and turn on/off, independently with respect to each other, the switches of the rectification stage and the primary switching stage.
    Type: Application
    Filed: May 27, 2016
    Publication date: September 22, 2016
    Inventors: Osvaldo Enrico Zambetti, Stefano Saggini
  • Patent number: 9379628
    Abstract: A resonant converter includes a primary switching circuit having a primary winding and a primary switching stage configured to drive the primary winding; a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, a resonance capacitor connected in parallel to the secondary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the resonance capacitor; a rectification stage connected in parallel with the resonance capacitor, and having first and second switches coupled to form a half-bridge; and a feedback command circuit. The command circuit is configured to receive feedback signals representing an output voltage and an output current at the output terminal of the resonant converter, receive voltages at the terminals of the resonance capacitor, and turn on/off, independently with respect to each other, the switches of the rectification stage and the primary switching stage.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: June 28, 2016
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Stefano Saggini
  • Patent number: 9317047
    Abstract: In a multi-phase power supply voltage regulator functioning at a nominal switching frequency, one or more phases are kept off for optimizing energy efficiency at relatively low load conditions. Reactivation of stand-by phases in response to a load increase transient is made more efficiently by exploiting information already present in the output voltage control loop. The technique comprises a) deriving from the control loop information on the equivalent nominal switching frequency given by the product of the nominal switching frequency by the number of active phases; b) updating at every beat of a clock signal the instantaneous value of the equivalent switching frequency; c) determining the band of equivalent switching frequency values to which the instantaneous value belongs; d) logically combining the equivalent switching frequency information with a determined band of output current level, for switching on one or more stand-by phases in response to a load increase transient.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: April 19, 2016
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Osvaldo Enrico Zambetti, Daniele Giorgetti, Alessandro Zafarana
  • Publication number: 20160087527
    Abstract: A method is provided for controlling a converter of the multiphase interleaving type. According to the method, there is detected when a change of the load applied to an output terminal of the converter occurs. All the phases of the converter are simultaneously turned off, and a driving interleaving phase shift is recovered so as to restart a normal operation of the converter. A controller for carrying out such a method is also provided.
    Type: Application
    Filed: November 30, 2015
    Publication date: March 24, 2016
    Inventors: Alessandro Zafarana, Osvaldo Enrico Zambetti
  • Publication number: 20150222193
    Abstract: A resonant converter includes a primary switching circuit having a primary winding and a primary switching stage configured to drive the primary winding; a secondary resonant circuit having a secondary winding magnetically coupled to the primary winding, a resonance capacitor connected in parallel to the secondary winding, and first and second secondary inductors respectively coupled between an output terminal of the converter and respective terminals of the resonance capacitor; a rectification stage connected in parallel with the resonance capacitor, and having first and second switches coupled to form a half-bridge; and a feedback command circuit. The command circuit is configured to receive feedback signals representing an output voltage and an output current at the output terminal of the resonant converter, receive voltages at the terminals of the resonance capacitor, and turn on/off, independently with respect to each other, the switches of the rectification stage and the primary switching stage.
    Type: Application
    Filed: February 2, 2015
    Publication date: August 6, 2015
    Inventors: Osvaldo Enrico Zambetti, Stefano Saggini
  • Patent number: 9097592
    Abstract: A sensing device includes a first current mirror configured to mirror a current flowing through a thermistor, a second current mirror configured to mirror a current flowing through a reference resistor a comparator configured to compare voltages on the thermistor and the resistor, and a counter configured to generate a control signal representative of a temperature difference based on the comparison. The control signal controls a mirroring ratio of the second current mirror. The sensing device may be employed to generate a droop current of a voltage regulator.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: August 4, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Dario Zambotti
  • Patent number: 9018930
    Abstract: A current generator includes a thermistor configured to receive an input current, a reference resistor having a resistance substantially corresponding to a resistance of said thermistor at a reference temperature, a current mirror configured to generate a mirrored current proportional to said input current, a feedback circuit configured to generate an output compensation current proportional to a difference between voltages on said reference resistor and on said thermistor, and a first adder configured to force through said reference resistor a difference current between said mirrored replica current and said output compensation current.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: April 28, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventor: Osvaldo Enrico Zambetti
  • Patent number: 8981743
    Abstract: A switching voltage regulator including a comparison module configured to receive a reference voltage and a feedback voltage and to generate a comparison signal corresponding to a difference between the reference voltage and the feedback voltage, an offset module configured to generate an offset signal based on a number of active phases of the voltage regulator, an adder configured to generate a control signal based on the comparison signal and the offset signal, a plurality of pulse-width-modulated (PWM) power stages, and a control module configured to control the plurality of PWM power stages based at least in part on the control signal generated by the adder.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: March 17, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Daniele Giorgetti
  • Patent number: 8970195
    Abstract: A method is provided for controlling turn-on of phases of a multiphase regulator. According to the method, there are tested the conditions necessary for the turn-on of a phase to be turned-on indicated by a first cell of the phase register, and in response to a positive result a corresponding ramp signal is reset. There is then tested the conditions necessary for the turn-on of a phase successive to the phase to be turned on according to the list of priorities of the phase register, and corresponding ramp signals are reset if there is a positive result. In response to no positive results of testing conditions necessary for the turn-on of all phases successive to the phase to be turned on, there is reset a ramp signal corresponding to a phase successive to a last turned on phase indicated by a last cell of the phase register.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: March 3, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Alessandro Zafarana
  • Patent number: 8963519
    Abstract: A switching voltage regulator includes a comparison module configured to receive a reference voltage and a feedback voltage and to generate a comparison signal based on a difference between the reference voltage and the feedback voltage, and a control module configured to generate a gain control threshold signal based on at least one of the reference voltage and the feedback voltage. The control module may be configured to control a duration of a PWM pulse based on the at least one of the reference voltage and the feedback voltage. The feedback voltage may a regulated output voltage of the switching voltage regulator. The switching voltage regulator may be implemented in an analog or a digital manner.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: February 24, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Osvaldo Enrico Zambetti, Daniele Giorgetti
  • Patent number: 8878503
    Abstract: The voltage regulators are capable of limiting undershoots of the output voltage without having a similar effect on overshoots because of the presence of a current cancellation network, input with the reference voltage and coupled to the second input of the error amplifier. This current cancellation network is adapted to inject into the second input a unidirectional compensation current of the first and second currents injected by the first and second feedback networks, respectively, the compensation current being determined by time variations of the difference between a replica of the output regulated voltage and the reference voltage and/or by time variations of the reference voltage.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: November 4, 2014
    Assignee: STMicroelectronics S.R.L.
    Inventors: Alessandro Zafarana, Osvaldo Enrico Zambetti
  • Publication number: 20140062430
    Abstract: In a multi-phase power supply voltage regulator functioning at a nominal switching frequency, one or more phases are kept off for optimizing energy efficiency at relatively low load conditions. Reactivation of stand-by phases in response to a load increase transient is made more efficiently by exploiting information already present in the output voltage control loop. The technique comprises a) deriving from the control loop information on the equivalent nominal switching frequency given by the product of the nominal switching frequency by the number of active phases; b) updating at every beat of a clock signal the instantaneous value of the equivalent switching frequency; c) determining the band of equivalent switching frequency values to which the instantaneous value belongs; d) logically combining the equivalent switching frequency information with a determined band of output current level, for switching on one or more stand-by phases in response to a load increase transient.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 6, 2014
    Applicant: STMicroelectronics S.r.I.
    Inventors: Osvaldo Enrico Zambetti, Daniele Giorgetti, Alessandro Zafarana