Patents by Inventor Robert J. Mayell

Robert J. Mayell 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: 10135357
    Abstract: A controller for use in a power converter includes a power switch including a drain, a source, a control input, and a tap. The power switch includes a first transistor coupled to a second transistor, a drain of the first transistor is coupled to the drain of the power switch and the source of the first transistor is coupled to the tap. A tap sense circuit is coupled to the tap. A drive circuit is coupled to receive an indicator signal from the tap sense circuit. The indicator signal is indicative of a voltage at the tap or the current through the first transistor. The drive circuit is coupled to receive a feedback signal representative of an output quantity of the power converter. The drive circuit is coupled to generate a drive signal to control switching of the power switch in response to the indicator signal and the feedback signal.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: November 20, 2018
    Assignee: Power Integrations, Inc.
    Inventors: Balu Balakrishnan, David G. R. LeBlanc, David Michael Hugh Matthews, Robert J. Mayell
  • Patent number: 9866108
    Abstract: A power converter includes a front end stage having a power factor correction controller, an output stage with a DC/DC controller, and light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage. In response to the detection, the power factor correction controller in the front end stage is turned off.
    Type: Grant
    Filed: October 6, 2015
    Date of Patent: January 9, 2018
    Assignee: Power Intergrations, Inc.
    Inventors: Robert J. Mayell, Bala Sudhakar Singamaneni
  • Patent number: 9401634
    Abstract: A controller for use in a power converter includes logic circuits to turn on and off a switch to regulate an output quantity. A first integrating capacitor is charged with a combination of a first current and a second current while the switch is turned on. The first current is proportional to a reset voltage and the second current is proportional to an input voltage. A reference generation circuit including a second integrating capacitor is charged with the first current during a previous switching cycle of the switch. The reference generation circuit generates a reference voltage in response to the second integrating capacitor. A comparator provides a stop signal to the logic circuits to turn off the switch in response to a comparison of a voltage across the first integrating capacitor with the reference voltage.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: July 26, 2016
    Assignee: Power Integrations, Inc.
    Inventors: Yury Gaknoki, Mingming Mao, Robert J. Mayell
  • Publication number: 20160105095
    Abstract: A power converter includes a front end stage having a power factor correction controller, an output stage with a DC/DC controller, and light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage. In response to the detection, the power factor correction controller in the front end stage is turned off.
    Type: Application
    Filed: October 6, 2015
    Publication date: April 14, 2016
    Inventors: Robert J. Mayell, Bala Sudhakar Singamaneni
  • Patent number: 8780589
    Abstract: An example power supply includes a first power converter, a second power converter, and a shared clamp reset circuit. The first power converter is adapted to convert an input to a first voltage output and includes a first diode and a first transformer having a first primary winding. The second power converter is adapted to convert the input to a second voltage output and includes a second diode and a second transformer having a second primary winding. The shared clamp reset circuit is included in the first power converter and is coupled to the cathode of the first diode. The shared clamp reset circuit also includes a clamp connection that is coupled to the cathode of the second diode. The shared clamp reset circuit is adapted to manage leakage inductance energy within the first transformer and within the second transformer.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: July 15, 2014
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Publication number: 20140098571
    Abstract: A controller for use in a power converter includes logic circuits to turn on and off a switch to regulate an output quantity. A first integrating capacitor is charged with a combination of a first current and a second current while the switch is turned on. The first current is proportional to a reset voltage and the second current is proportional to an input voltage. A reference generation circuit including a second integrating capacitor is charged with the first current during a previous switching cycle of the switch. The reference generation circuit generates a reference voltage in response to the second integrating capacitor. A comparator provides a stop signal to the logic circuits to turn off the switch in response to a comparison of a voltage across the first integrating capacitor with the reference voltage.
    Type: Application
    Filed: October 4, 2012
    Publication date: April 10, 2014
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Yury Gaknoki, Mingming Mao, Robert J. Mayell
  • Publication number: 20140022825
    Abstract: A power supply control circuit includes a threshold detection circuit coupled to a first terminal to measure a signal at the first terminal during a duration of an initialization period after a fourth terminal has been charged to a supply threshold value. A regulator circuit is coupled between a second terminal and the fourth terminal to charge the fourth terminal to the supply threshold value during the initialization period of the power supply control circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode in response to the signal measured at the first terminal. The first terminal is further coupled to receive one or more additional signals during normal operation at times other than the initialization period to provide at least one additional function for the power supply control circuit after the initialization period is complete.
    Type: Application
    Filed: August 20, 2013
    Publication date: January 23, 2014
    Applicant: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8625312
    Abstract: A switching circuit for use in a power converter includes a first active switch coupled between a first terminal of an input of the power converter and a first terminal of a primary winding of a transformer. A second active switch is coupled between a second terminal of the input and a second terminal of the primary winding. An output capacitance of the first active switch is greater than an output capacitance of the second active switch. A first passive switch is coupled between the second terminal of the primary winding and the first terminal of the input. A second passive switch is coupled between the second terminal of the input and the first terminal of the primary winding. A reverse recovery time of the first passive switch is greater than a reverse recovery time of the second passive switch.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: January 7, 2014
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Patent number: 8582325
    Abstract: A power supply includes a forward converter having a first transformer coupled to an input of the power supply and to a first voltage output. The power supply also includes a separate flyback converter having a second transformer that is coupled to the input and to a second voltage output. A clamp reset circuit is coupled to the first transformer and to the second transformer. The clamp reset circuit includes a capacitor and a voltage limiting element. The voltage limiting element is coupled to prevent energy received at the capacitor from both the power converters from exceeding a threshold. The voltage limiting element limits a voltage on the capacitor.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: November 12, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Patent number: 8542508
    Abstract: A saturation prevention circuit includes a first controlled current source, a second controlled current source, an integrating capacitor, and a comparator. The first controlled current source generates a first current that is proportional to an input voltage that is to be applied to a winding of a transformer. The second controlled current source generates a second current that is proportional to a reset voltage that is to be applied to the winding. The capacitor is charged with the first current while the input voltage is applied to the winding of the transformer and discharged with the second current while the reset voltage is applied to the winding. The comparator compares a voltage on the integrating capacitor with a first threshold and generates a first signal to immediately turn off the switch when the voltage on the integrating capacitor reaches the first threshold to limit a magnetic flux in the transformer.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: September 24, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Patent number: 8537577
    Abstract: A power supply includes an energy transfer element coupled between an input and an output. A switch is coupled to an input of the energy transfer element. A threshold detection circuit includes in an integrated circuit coupled to measure a signal from a resistive external circuit coupled between fourth and first external terminals of the integrated circuit during an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled between second and fourth external terminals of the integrated circuit. The regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the measured signal.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: September 17, 2013
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8441815
    Abstract: A switching circuit for use in a power supply includes a first active switch coupled to a first terminal of a primary winding of a transformer. A second active switch is coupled to a second terminal of the primary winding of the transformer. An output capacitance of the first active switch is greater than an output capacitance of the second active switch. A first passive switch is coupled to the second active switch and to the second terminal of the primary winding. A second passive switch is coupled to the first active switch and to the first terminal of the primary winding. A reverse recovery time of the first passive switch is greater than a reverse recovery time of the second passive switch. A recovery circuit is coupled to receive a current from the first passive switch.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: May 14, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Patent number: 8416585
    Abstract: An example power supply includes a first power converter, a second power converter, and a shared clamp reset circuit. The first power converter is adapted to convert an input to a first output and includes a first transformer having a first primary winding. The second power converter is also adapted to convert the input to a second output and includes a second transformer having a second primary winding. The second primary winding of the second transformer is not the first primary winding of the first transformer. The shared clamp reset circuit is coupled to the first primary winding of the first transformer and is coupled to the second primary winding of the second transformer to manage leakage inductance energy within the first transformer and within the second transformer.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: April 9, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Patent number: 8416586
    Abstract: A power supply includes a first power converter having a first transformer coupled to an input of the power supply and to a first output of the power supply. A clamp reset circuit is coupled to the first transformer. The clamp reset circuit includes a capacitor coupled to the first power converter and a Zener diode coupled to the capacitor. A second power converter is coupled to the clamp reset circuit. The second power converter includes a second transformer coupled to the clamp circuit and to a second output of the power supply. The capacitor is coupled to store energy received from the first power converter and the second power converter. The Zener diode is coupled to prevent the energy received from the first power converter and the second power converter from exceeding a threshold. The Zener diode limits voltage on the capacitor.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: April 9, 2013
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Publication number: 20130058136
    Abstract: A saturation prevention circuit includes a first controlled current source, a second controlled current source, an integrating capacitor, and a comparator. The first controlled current source generates a first current that is proportional to an input voltage that is to be applied to a winding of a transformer. The second controlled current source generates a second current that is proportional to a reset voltage that is to be applied to the winding. The capacitor is charged with the first current while the input voltage is applied to the winding of the transformer and discharged with the second current while the reset voltage is applied to the winding. The comparator compares a voltage on the integrating capacitor with a first threshold and generates a first signal to immediately turn off the switch when the voltage on the integrating capacitor reaches the first threshold to limit a magnetic flux in the transformer.
    Type: Application
    Filed: November 1, 2012
    Publication date: March 7, 2013
    Inventor: Robert J. Mayell
  • Publication number: 20120320639
    Abstract: A power supply includes an energy transfer element coupled between an input and an output. A switch is coupled to an input of the energy transfer element. A threshold detection circuit includes in an integrated circuit coupled to measure a signal from a resistive external circuit coupled between fourth and first external terminals of the integrated circuit during an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled between second and fourth external terminals of the integrated circuit. The regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the measured signal.
    Type: Application
    Filed: August 31, 2012
    Publication date: December 20, 2012
    Applicant: POWER INTEGRATIONS, INC.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8331116
    Abstract: A power converter in one aspect limits the magnetic flux in a transformer. A control circuit included in the power converter includes a pulse width modulator, a logic circuit and a saturation prevention circuit. The saturation prevention circuit asserts a first signal when a first integral value of the input voltage reaches a first threshold value and asserts a second signal after a delay time that begins when a difference between the first integral value and a second integral value of a reset voltage of the transformer falls to a second threshold value. The logic circuit turns off the switch when the first signal is asserted, and allows the switch to turn on and off in accordance with the pulse width modulator when the second signal is asserted.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: December 11, 2012
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell
  • Publication number: 20120250364
    Abstract: A power supply includes a first power converter having a first transformer coupled to an input of the power supply and to a first output of the power supply. A clamp reset circuit is coupled to the first transformer. The clamp reset circuit includes a capacitor coupled to the first power converter and a Zener diode coupled to the capacitor. A second power converter is coupled to the clamp reset circuit. The second power converter includes a second transformer coupled to the clamp circuit and to a second output of the power supply. The capacitor is coupled to store energy received from the first power converter and the second power converter. The Zener diode is coupled to prevent the energy received from the first power converter and the second power converter from exceeding a threshold. The Zener diode limits voltage on the capacitor.
    Type: Application
    Filed: June 18, 2012
    Publication date: October 4, 2012
    Applicant: POWER INTEGRATIONS, INC.
    Inventor: Robert J. Mayell
  • Patent number: 8279643
    Abstract: An integrated circuit includes a threshold detection circuit that is coupled to measure a signal from a first resistive external circuit coupled between a fourth external terminal of the integrated circuit and a first external terminal of the integrated circuit during a duration of an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period of the integrated circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the signal measured from the first resistive external circuit during the duration of the initialization period after the fourth external terminal has been charged to the supply threshold value.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: October 2, 2012
    Assignee: Power Integrations, Inc.
    Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
  • Patent number: 8279636
    Abstract: A power supply includes a first power converter, a second power converter, and a clamp reset circuit. The clamp reset circuit is electrically coupled to other components within the first power converter and the second power converter. A clamp standby connection can be provided to electrically couple the clamp reset circuit to components comprising the second power converter. The clamp reset circuit is coupled to reduce magnetizing energy of a transformer of the first power converter and limit voltage in a component of the second power converter. The clamp reset circuit may include a Zener diode and a resistor that are adapted to reduce magnetizing energy of the first power converter and voltage through the second power converter. The clamp reset circuit normally includes a capacitor that is adapted to store energy from the first power converter and the second power converter.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: October 2, 2012
    Assignee: Power Integrations, Inc.
    Inventor: Robert J. Mayell