Patents by Inventor Roland Sylvere Saint-Pierre

Roland Sylvere Saint-Pierre 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: 20150323949
    Abstract: A power factor correction (PFC) controller includes a driver circuit coupled to vary the switching frequency of the power switch of the PFC converter in response to an input current of a PFC converter and an input voltage of the PFC converter, and to output a third signal to switch the power switch of the PFC converter to control the input current to substantially follow the input voltage. A frequency adjust circuit is coupled to receive an error voltage signal representative of an output of the PFC converter. The frequency adjust circuit is further coupled to output an adjusted error signal to adjust the end of the off time of the power switch of the PFC converter in response to the error voltage signal.
    Type: Application
    Filed: July 21, 2015
    Publication date: November 12, 2015
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 9116538
    Abstract: A power factor correction (PFC) controller includes a capacitor, an error amplifier, a switching frequency adjuster, a comparator, and a drive signal generator. The current source generates a current that is representative of an instantaneous input voltage of a PFC converter to charge the capacitor when a power switch of the PFC converter is off. The switching frequency adjuster generates an adjusted error signal in response to an error signal generated by the error amplifier. The comparator compares a voltage on the capacitor with the adjusted error signal to generate a first signal to end an off time of the power switch. The drive signal generator controls switching of the power switch in response to the first signal. The switching frequency adjuster changes the adjusted error signal in response to changes in the error signal to adjust an average switching frequency of the power switch.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: August 25, 2015
    Assignee: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20140268922
    Abstract: A controller for use in a power converter includes a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output. The controller also includes an input for receiving an enable signal including enable events responsive to the power converter output. The drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold. A current limit threshold generator is coupled to receive the drive signal from the enable events of the enable signal. The current limit threshold may be a ramp signal and the ramp signal along with the time between enable events may be used to modulate the drive signal.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Balu Balakrishnan, Roland Sylvere Saint-Pierre, Giao Minh Pham, Lance M. Wong
  • Publication number: 20140268951
    Abstract: A power converter controller includes a switch driver circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from an input of the power converter to an output of the power converter. An input sense circuit is coupled to receive an input sense signal representative of the input of a power converter. A sense enable circuit is coupled to receive the drive signal to generate a sense enable signal to control the input sense circuit in response to the drive signal. The sense enable signal is coupled to control the input sense circuit to sense the input sense signal continuously in response to a first load condition, and sense the input sense signal only during a fraction of a switching period of the power switch in response to a second load condition.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: Power Integrations, Inc.
    Inventors: Zhao-Jun Wang, Giao Minh Pham, Roland Sylvere Saint-Pierre
  • Patent number: 8749212
    Abstract: An example on time control circuit for use in a power factor correction (PFC) controller includes an amplifier, an integrator, and a comparator. The amplifier generates an error signal that is representative of a difference between a feedback signal and a reference value. The integrator integrates a current sense signal that is representative of a current through the power switch to generate an integrator output signal. A gain of the integrator is varied in response to a voltage sense signal that is representative of a value of an input voltage of the PFC converter. The comparator generates a switch power off signal to terminate the on time of the power switch in response to comparing the integrator output signal with the error signal.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: June 10, 2014
    Assignee: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20140009086
    Abstract: An example power supply includes an energy transfer element, a switch, and a controller. The switch is coupled to the energy transfer element to control a transfer of energy from an input to a galvanically isolated output of the power supply. The controller includes a delayed ramp generator, an integrator, an arithmetic operator, and a drive signal generator. The integrator generates a first signal responsive to integrating an input current of the power supply. The arithmetic operator generates a second signal responsive to the first signal and responsive to a ratio of a rectified input voltage to a dc output voltage of the power supply. The drive signal generator generates a drive signal in response to a delayed ramp signal and the second signal to control switching of the switch to provide power factor correction of the power supply and to provide a regulated current at the output.
    Type: Application
    Filed: September 4, 2013
    Publication date: January 9, 2014
    Applicant: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20130307495
    Abstract: A power factor correction (PFC) controller includes a capacitor, an error amplifier, a switching frequency adjuster, a comparator, and a drive signal generator. The current source generates a current that is representative of an instantaneous input voltage of a PFC converter to charge the capacitor when a power switch of the PFC converter is off. The switching frequency adjuster generates an adjusted error signal in response to an error signal generated by the error amplifier. The comparator compares a voltage on the capacitor with the adjusted error signal to generate a first signal to end an off time of the power switch. The drive signal generator controls switching of the power switch in response to the first signal. The switching frequency adjuster changes the adjusted error signal in response to changes in the error signal to adjust an average switching frequency of the power switch.
    Type: Application
    Filed: July 26, 2013
    Publication date: November 21, 2013
    Applicant: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20130278237
    Abstract: An example on time control circuit for use in a power factor correction (PFC) controller includes an amplifier, an integrator, and a comparator. The amplifier generates an error signal that is representative of a difference between a feedback signal and a reference value. The integrator integrates a current sense signal that is representative of a current through the power switch to generate an integrator output signal. A gain of the integrator is varied in response to a voltage sense signal that is representative of a value of an input voltage of the PFC converter. The comparator generates a switch power off signal to terminate the on time of the power switch in response to comparing the integrator output signal with the error signal.
    Type: Application
    Filed: June 14, 2013
    Publication date: October 24, 2013
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 8525493
    Abstract: A power factor correction (PFC) controller includes a first integrator coupled to integrate an input current of a PFC converter. A first signal is generated in response to the first integrator to end an on time of a power switch of the PFC converter. A second integrator is coupled to integrate a difference between a constant voltage and an input voltage of the PFC converter. A second signal is generated in response to the second integrator to end an off time of the power switch of the PFC converter. A driver circuit is coupled to vary the switching frequency of the power switch of the PFC converter in response to the first and the second signals and to output a third signal to switch the power switch of the PFC converter to control the input current to be substantially proportional to the input voltage.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: September 3, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 8487601
    Abstract: An example power factor correction (PFC) converter includes an energy transfer element, a power switch, and a controller. The controller includes an integrator and on/off logic. The integrator generates an integrator output signal in response to a voltage sense signal and a current sense signal. The on/off logic drives the power switch on and off to control a transfer of energy through the energy transfer element to an output of the PFC converter and terminates an on time of the power switch when the integrator output signal reaches a threshold value. A gain of the integrator is adjusted in response to the voltage sense signal such that the threshold value is substantially constant independent of the magnitude of the ac voltage source when a load condition at the output of the PFC converter is constant.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: July 16, 2013
    Assignee: Power Intergrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20110316491
    Abstract: A power factor correction (PFC) controller includes a first integrator coupled to integrate an input current of a PFC converter. A first signal is generated in response to the first integrator to end an on time of a power switch of the PFC converter. A second integrator is coupled to integrate a difference between a constant voltage and an input voltage of the PFC converter. A second signal is generated in response to the second integrator to end an off time of the power switch of the PFC converter. A driver circuit is coupled to vary the switching frequency of the power switch of the PFC converter in response to the first and the second signals and to output a third signal to switch the power switch of the PFC converter to control the input current to be substantially proportional to the input voltage.
    Type: Application
    Filed: September 2, 2011
    Publication date: December 29, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20110305052
    Abstract: An example power factor correction (PFC) converter includes an energy transfer element, a power switch, and a controller. The controller includes an integrator and on/off logic. The integrator generates an integrator output signal in response to a voltage sense signal and a current sense signal. The on/off logic drives the power switch on and off to control a transfer of energy through the energy transfer element to an output of the PFC converter and terminates an on time of the power switch when the integrator output signal reaches a threshold value. A gain of the integrator is adjusted in response to the voltage sense signal such that the threshold value is substantially constant independent of the magnitude of the ac voltage source when a load condition at the output of the PFC converter is constant.
    Type: Application
    Filed: August 18, 2011
    Publication date: December 15, 2011
    Applicant: POWER INTEGRATIONS, INC.
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 8040114
    Abstract: A controller for use in a power factor correction (PFC) converter includes a power factor correction controller circuit coupled to output a drive signal to switch a power switch between an on state and an off state to transfer energy to an output of the PFC converter. The controller also includes an switching frequency adjuster coupled to output a frequency adjust signal to the power factor correction controller circuit to adjust an average switching frequency of the power switch in response to a load signal representative of a load coupled to the output of the PFC converter, wherein the frequency adjust signal is responsive to a range of load conditions.
    Type: Grant
    Filed: November 7, 2008
    Date of Patent: October 18, 2011
    Assignee: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 8004262
    Abstract: A controller for use in a power factor correction (PFC) converter is disclosed. An example controller includes an integrator coupled to receive a voltage sense signal responsive to a magnitude of an ac voltage source. The ac voltage source is coupled to an input of the PFC converter, which is coupled to an energy transfer element, which is coupled to a power switch. The integrator is further coupled to receive a current sense signal responsive to a current flowing in the power switch when the power switch is on. The integrator is to generate an integrator output signal in response to the voltage sense signal and the current sense signal. On/off logic is to be coupled to drive the power switch on and off to control a transfer of energy through the energy transfer element to a load coupled to an output of the PFC converter. The on/off logic is coupled to terminate an on time of the power switch when the integrator output signal reaches a threshold value.
    Type: Grant
    Filed: November 7, 2008
    Date of Patent: August 23, 2011
    Assignee: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20100118573
    Abstract: A controller for use in a power factor correction (PFC) converter includes a power factor correction controller circuit coupled to output a drive signal to switch a power switch between an on state and an off state to transfer energy to an output of the PFC converter. The controller also includes an switching frequency adjuster coupled to output a frequency adjust signal to the power factor correction controller circuit to adjust an average switching frequency of the power switch in response to a load signal representative of a load coupled to the output of the PFC converter, wherein the frequency adjust signal is responsive to a range of load conditions.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 13, 2010
    Applicant: POWER INTEGRATIONS, INC.
    Inventor: Roland Sylvere Saint-Pierre
  • Publication number: 20100118571
    Abstract: A controller for use in a power factor correction (PFC) converter is disclosed. An example controller includes an integrator coupled to receive a voltage sense signal responsive to a magnitude of an ac voltage source. The ac voltage source is coupled to an input of the PFC converter, which is coupled to an energy transfer element, which is coupled to a power switch. The integrator is further coupled to receive a current sense signal responsive to a current flowing in the power switch when the power switch is on. The integrator is to generate an integrator output signal in response to the voltage sense signal and the current sense signal. On/off logic is to be coupled to drive the power switch on and off to control a transfer of energy through the energy transfer element to a load coupled to an output of the PFC converter. The on/off logic is coupled to terminate an on time of the power switch when the integrator output signal reaches a threshold value.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 13, 2010
    Applicant: Power Integrations, Inc.
    Inventor: Roland Sylvere Saint-Pierre
  • Patent number: 6151231
    Abstract: A series-resonant power converter (10) featuring a tap winding (106) on a transformer (100) that is coupled to a resonant capacitor (124) in a resonant tank circuit (122). An output voltage is taken at a secondary (104) of the transformer (100) via a rectifier (110). A control circuit (140) is coupled to the output voltage to monitor the output voltage with respect to a reference to determine load conditions and to generate a control signal representative thereof. An energy recirculation circuit (180) is coupled to the control circuit (140) and to the voltage source (12) and comprises a switch (186) coupled to the tap winding (106) of the transformer (100).
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: November 21, 2000
    Assignee: Motorola, Inc.
    Inventors: Roland Sylvere Saint-Pierre, Ashok R. Patil, John Wendell Oglesbee
  • Patent number: 6081438
    Abstract: A series-resonant power converter (10) comprising a transformer (100), a resonant tank circuit (120) having a piezo-electric crystal (122) as the resonant element and a series-connected resonant capacitor (124). First and second switches (132 and 134) are connected to the transformer (100) and are driven by voltages at windings of the transformer so as to alternately turn on. The piezo-electric crystal (122) self-oscillates to store and release energy and thereby charge and discharge the capacitor (124). Moreover, as a result of the self-oscillation of the resonant circuit (120), the switches (132 and 134) are alternately driven in synchronism with the charging and discharging cycle of the capacitor (122) through windings of the transformer (100). No additional switching circuitry is needed to achieve proper oscillation of the resonant tank circuit (120).
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: June 27, 2000
    Assignee: Motorola, Inc.
    Inventors: Roland Sylvere Saint-Pierre, Ashok R. Patil