Patents by Inventor Kent Wong
Kent Wong 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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Publication number: 20200121057Abstract: A cosmetic apparatus has an operating piece, a recess, and a holder. The operating piece has a seat and a cosmetic head. The cosmetic head is mounted on the seat. The recess is formed around an outer surface of the seat, and is adjacent to a junction of the seat and the cosmetic head. The holder is made of silicon, is detachably mounted around the operating piece, and is inserted into the recess. The holder has a loop and a tab. The loop is mounted around the operating piece, and is inserted into the recess. The tab is formed at the loop and protrudes from a bottom surface of the seat.Type: ApplicationFiled: October 18, 2018Publication date: April 23, 2020Inventor: Yee Keung Kent Wong
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Patent number: 10224820Abstract: A circuit for regulating an output level of a power converter includes an adjustment circuit to be coupled to a receive a feedback signal representative of an output level of the power converter. The adjustment circuit is coupled to generate a comparison result signal. A control circuit is coupled to receive the comparison result signal and an oscillating signal. A switch including a first terminal, a second terminal and a control terminal is coupled to the control circuit. The control circuit is coupled to generate a control signal to control switching of the switch. The switch is operable to couple or decouple the first terminal and the second terminal in response to the control signal received at the control terminal. The control signal is responsive to the oscillating signal and to a change in the comparison result signal.Type: GrantFiled: October 7, 2016Date of Patent: March 5, 2019Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Patent number: 10061302Abstract: A waste removal and transfer assembly for a 3D printing system comprises a waste material remover and a waste material collector. The waste material remover comprises a movable waste removing element selectively movable into contact with a planerizer roller to remove 3D printing waste material from the planerizer roller. The waste material remover is coupled to translate with the planerizer roller and comprises an opening leading to a waste material receptacle configured to receive waste material and at least one port selectively operable to transfer waste material from the waste receptacle. The waste material collector has a receiving position that is stationary relative to the waste material remover. The waste material collector comprises an opening and a waste material storage recess to receive waste material transferred from the waste material remover via the at least one port and to store the received waste material for subsequent disposal.Type: GrantFiled: April 29, 2016Date of Patent: August 28, 2018Assignee: 3D Systems, Inc.Inventors: Jos Wim Jacobs, Nathan Hult, Keith Newell, Keaton Jonathan Daniel Snyder, Jasper Kent Wong, Gustavo Fricke, Scott Summit
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Publication number: 20170025959Abstract: A circuit for regulating an output level of a power converter includes an adjustment circuit to be coupled to a receive a feedback signal representative of an output level of the power converter. The adjustment circuit is coupled to generate a comparison result signal. A control circuit is coupled to receive the comparison result signal and an oscillating signal. A switch including a first terminal, a second terminal and a control terminal is coupled to the control circuit. The control circuit is coupled to generate a control signal to control switching of the switch. The switch is operable to couple or decouple the first terminal and the second terminal in response to the control signal received at the control terminal. The control signal is responsive to the oscillating signal and to a change in the comparison result signal.Type: ApplicationFiled: October 7, 2016Publication date: January 26, 2017Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Patent number: 9484824Abstract: An on/off controller device includes a control circuit to generate a control signal to switch a power switch between an on state and an off state to transfer energy from a primary side to a secondary side of a switched mode power supply. A comparator is coupled to generate an enable signal that enables and disables the switching of the power switch by the control circuit. The comparator compares a feedback signal with a variable threshold and switches the enable signal between enabling and disabling the switching of the power switch. The variable threshold is modulated to increase a fundamental frequency of the switching of the power switch by the control circuit. The variable threshold is modulated with a fixed amplitude pulse that is combined with a second threshold to modulate the variable threshold between a first higher value and a second lower value.Type: GrantFiled: January 14, 2014Date of Patent: November 1, 2016Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Patent number: 8742771Abstract: An example integrated control circuit includes a regulator, a first comparator, a second comparator, and a counter. The regulator is to charge, during a time period, a capacitor. The first comparator is to provide an output indicating when a voltage on the capacitor reaches a first threshold voltage. The second comparator is coupled to provide an output indicating when the voltage on the capacitor reaches a second threshold voltage. The counter is coupled to begin counting in response to the first threshold voltage being reached and is coupled to stop counting in response to the second threshold voltage being reached. The counter is coupled to provide an output representative of the capacitance value of the capacitor during the time period and the integrated control circuit receives a bias current at the terminal from the capacitor to provide power to operate the integrated control circuit after the time period has ended.Type: GrantFiled: August 24, 2010Date of Patent: June 3, 2014Assignee: Power Integrations, Inc.Inventors: David Michael Hugh Matthews, Alex B. Djenguerian, Kent Wong, Balu Balakrishnan
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Publication number: 20140126246Abstract: An on/off controller device includes a control circuit to generate a control signal to switch a power switch between an on state and an off state to transfer energy from a primary side to a secondary side of a switched mode power supply. A comparator is coupled to generate an enable signal that enables and disables the switching of the power switch by the control circuit. The comparator compares a feedback signal with a variable threshold and switches the enable signal between enabling and disabling the switching of the power switch. The variable threshold is modulated to increase a fundamental frequency of the switching of the power switch by the control circuit. The variable threshold is modulated with a fixed amplitude pulse that is combined with a second threshold to modulate the variable threshold between a first higher value and a second lower value.Type: ApplicationFiled: January 14, 2014Publication date: May 8, 2014Applicant: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Patent number: 8665615Abstract: One controller for a power supply includes an oscillator, a first circuit, a counter, and a pause circuit. The first circuit generates a drive signal to control switching of a switch to regulate an output of the power supply. The first circuit initiates an on time period of the switch in response to both a clock signal of the oscillator and an enable signal that is generated in response to a feedback signal of the power supply. The counter receives the enable signal and generates an output signal when the counter reaches a count value indicating that the enable signal has been idle for an amount of time. The pause circuit generates a pause signal in response to the output signal of the counter. The oscillator is paused in response to the pause signal and a maximum on time period of the switch is extended while the oscillator is paused.Type: GrantFiled: April 19, 2013Date of Patent: March 4, 2014Assignee: Power Integrations, Inc.Inventors: Chan Woong Park, Alex B. Djenguerian, Kent Wong
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Patent number: 8654547Abstract: In one aspect, a power supply includes an energy transfer element, a switch, a feedback circuit, a comparator, a state machine, and a control circuit. The feedback circuit generates a feedback signal representative of an output level of the power supply. The comparator provides a feedback state signal having a first feedback state that represents the output level of the power supply being above a threshold level and a second feedback state that represents the output level being below the threshold level. The state machine selectively modulates a first signal in response to the feedback state signal, where the first signal is the feedback signal or the threshold value signal. The control circuit is coupled to control switching of the switch to regulate the output level of the power supply in response to the feedback state signal.Type: GrantFiled: May 8, 2012Date of Patent: February 18, 2014Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Publication number: 20140022825Abstract: 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: ApplicationFiled: August 20, 2013Publication date: January 23, 2014Applicant: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
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Patent number: 8587284Abstract: A power supply includes an energy transfer element, a switch, and a controller. The controller includes a modulator, a drive signal generator, a comparator, and a variable current limit generator. The modulator generates an enable signal having logic states responsive to a feedback signal. The drive signal generator either enables or skips enabling a switch of the power supply during a switching period in response to the logic state of the enable signal. The comparator asserts an over current signal to disable the switch if the switch current exceeds a variable current limit. The variable current limit generator sets the variable current limit to a first current limit in response to one logic state of the enable signal and sets the variable current limit to a second current limit if the enable signal transitions logic states and the over current signal is asserted during the switching period.Type: GrantFiled: February 28, 2012Date of Patent: November 19, 2013Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Stefan Bäurle, Kent Wong
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Patent number: 8537577Abstract: 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: GrantFiled: August 31, 2012Date of Patent: September 17, 2013Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
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Publication number: 20130232358Abstract: One controller for a power supply includes an oscillator, a first circuit, a counter, and a pause circuit. The first circuit generates a drive signal to control switching of a switch to regulate an output of the power supply. The first circuit initiates an on time period of the switch in response to both a clock signal of the oscillator and an enable signal that is generated in response to a feedback signal of the power supply. The counter receives the enable signal and generates an output signal when the counter reaches a count value indicating that the enable signal has been idle for an amount of time. The pause circuit generates a pause signal in response to the output signal of the counter. The oscillator is paused in response to the pause signal and a maximum on time period of the switch is extended while the oscillator is paused.Type: ApplicationFiled: April 19, 2013Publication date: September 5, 2013Applicant: Power Integrations, Inc.Inventors: Chan Woong Park, Alex B. Djenguerian, Kent Wong
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Patent number: 8456871Abstract: One example controller for a power supply includes an oscillator, a drive signal generator, and a restart circuit. The oscillator generates a clock signal and the drive signal generator controls switching of a switch to regulate an output of the power supply in response to the clock signal. The restart circuit generates a restart signal in response to a current through the switch and in response to an absolute maximum on time period. The oscillator generates the clock signal to have a fixed maximum frequency in response to the restart signal indicating that the current through the switch reaches a current limit threshold within the absolute maximum on time period. The oscillator also generates the clock signal to have a variable minimum frequency in response to the restart signal indicating that the current through the switch has not reached the current limit threshold within the maximum on time period.Type: GrantFiled: February 10, 2012Date of Patent: June 4, 2013Assignee: Power Integrations, Inc.Inventors: Chan Woong Park, Alex B. Djenguerian, Kent Wong
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Patent number: 8427124Abstract: A method and apparatus of reducing peak current variation with changing input line voltage in a switch mode power supply is disclosed. An example method includes sensing a current through a switching device of the switch mode power supply. A variable current limit threshold is generated, which increases from a first level to a second level during an on time of the switching device. The current is compared to the variable current limit threshold. A feedback signal representative of an output voltage of the switch mode power supply is sensed. The switching device is controlled in response to the feedback signal and said comparing the current to the variable current limit threshold.Type: GrantFiled: July 28, 2011Date of Patent: April 23, 2013Assignee: Power Integrations, Inc.Inventors: Balu Balakrishnan, Alex B. Djenguerian, Kent Wong, David Michael Hugh Matthews
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Publication number: 20120320639Abstract: 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: ApplicationFiled: August 31, 2012Publication date: December 20, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
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Patent number: 8279643Abstract: 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: GrantFiled: January 4, 2012Date of Patent: October 2, 2012Assignee: Power Integrations, Inc.Inventors: Alex B. Djenguerian, Robert J. Mayell, Kent Wong
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Publication number: 20120218788Abstract: In one aspect, a power supply includes an energy transfer element, a switch, a feedback circuit, a comparator, a state machine, and a control circuit. The feedback circuit generates a feedback signal representative of an output level of the power supply. The comparator provides a feedback state signal having a first feedback state that represents the output level of the power supply being above a threshold level and a second feedback state that represents the output level being below the threshold level. The state machine selectively modulates a first signal in response to the feedback state signal, where the first signal is the feedback signal or the threshold value signal. The control circuit is coupled to control switching of the switch to regulate the output level of the power supply in response to the feedback state signal.Type: ApplicationFiled: May 8, 2012Publication date: August 30, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: Alex B. Djenguerian, Andrew J. Morrish, Arthur B. Odell, Kent Wong
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Publication number: 20120188799Abstract: One example controller for a power supply includes an oscillator, a drive signal generator, and a restart circuit. The oscillator generates a clock signal and the drive signal generator controls switching of a switch to regulate an output of the power supply in response to the clock signal. The restart circuit generates a restart signal in response to a current through the switch and in response to an absolute maximum on time period. The oscillator generates the clock signal to have a fixed maximum frequency in response to the restart signal indicating that the current through the switch reaches a current limit threshold within the absolute maximum on time period. The oscillator also generates the clock signal to have a variable minimum frequency in response to the restart signal indicating that the current through the switch has not reached the current limit threshold within the maximum on time period.Type: ApplicationFiled: February 10, 2012Publication date: July 26, 2012Applicant: POWER INTEGRATIONS, INC.Inventors: Chan Woong Park, Alex B. Djenguerian, Kent Wong
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Patent number: D838911Type: GrantFiled: June 8, 2017Date of Patent: January 22, 2019Assignee: ADC MEDICAL LIMITEDInventor: Yee Keung Kent Wong