Patents by Inventor Keng Chen
Keng Chen 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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Patent number: 11075577Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.Type: GrantFiled: December 3, 2018Date of Patent: July 27, 2021Assignee: Infineon Technologies Americas Corp.Inventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther
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Publication number: 20210119524Abstract: An apparatus such as a DC-DC power converter including a switch, an ON-time controller, and a compensator operates in a constant ON-time control mode. Over multiple control cycles, the ON-time controller controls an ON-time duration of activating the switch and generation of an output voltage to power a dynamic load. The compensator, in communication with the ON-time controller, adjusts the ON-time duration of activating the switch depending on a magnitude of output current delivered by the output voltage to the dynamic load. For example, during heavier load conditions when the dynamic load consumes a higher amount of current, and in which internal resistive losses of the power supply become more substantial, the compensator increases the ON-time duration of activating the switch, resulting in operation of the power supply and switch closer to a desired frequency setpoint.Type: ApplicationFiled: October 17, 2019Publication date: April 22, 2021Inventors: Keng Chen, Luca Petruzzi
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Patent number: 10917011Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: GrantFiled: September 24, 2019Date of Patent: February 9, 2021Assignee: Infineon Technologies Austria AGInventors: Anthony B. Candage, Keng Chen, Paul Sisson
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Patent number: 10775817Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage error. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: GrantFiled: March 1, 2018Date of Patent: September 15, 2020Assignee: Infineon Technologies Austria AGInventors: Paul Sisson, Keng Chen
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Publication number: 20200220448Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.Type: ApplicationFiled: March 17, 2020Publication date: July 9, 2020Inventors: Keng Chen, Luca Petruzzi
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Patent number: 10651797Abstract: An apparatus includes a first amplifier, a second amplifier, and a compensation-setting generator to generate a first amplifier compensation setting and second amplifier compensation setting. A controller is operable to: i) apply the first amplifier compensation setting to the first amplifier and apply the second amplifier compensation setting to the second amplifier. The controller is further operable to switch between generating updates to the first amplifier compensation setting and the second amplifier compensation setting.Type: GrantFiled: April 9, 2018Date of Patent: May 12, 2020Assignee: Infineon Technologies Austria AGInventors: Keng Chen, Luca Petruzzi
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Patent number: 10637342Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.Type: GrantFiled: June 29, 2018Date of Patent: April 28, 2020Assignee: Infineon Technologies Austria AGInventors: Keng Chen, Luca Petruzzi
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Publication number: 20200021193Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: ApplicationFiled: September 24, 2019Publication date: January 16, 2020Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
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Publication number: 20200007021Abstract: A power supply includes a reference voltage generator, a power supply phase, and an adjustor. During operation, the reference voltage generator produces a reference voltage. The power supply phase produces an output voltage to power a load as a function of an output voltage feedback signal derived from the output voltage and the reference voltage. The adjustor adjusts a magnitude of the reference voltage to maintain regulation of the output voltage with respect to a desired voltage setpoint.Type: ApplicationFiled: June 29, 2018Publication date: January 2, 2020Inventors: Keng Chen, Luca Petruzzi
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Patent number: 10461641Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: GrantFiled: March 1, 2018Date of Patent: October 29, 2019Assignee: Infineon Technologies Austria AGInventors: Anthony B. Candage, Keng Chen, Paul Sisson
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Publication number: 20190312551Abstract: An apparatus includes a first amplifier, a second amplifier, and a compensation-setting generator to generate a first amplifier compensation setting and second amplifier compensation setting. A controller is operable to: i) apply the first amplifier compensation setting to the first amplifier and apply the second amplifier compensation setting to the second amplifier. The controller is further operable to switch between generating updates to the first amplifier compensation setting and the second amplifier compensation setting.Type: ApplicationFiled: April 9, 2018Publication date: October 10, 2019Inventors: Keng Chen, Luca Petruzzi
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Publication number: 20190271998Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage error. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: ApplicationFiled: March 1, 2018Publication date: September 5, 2019Inventors: Paul Sisson, Keng Chen
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Publication number: 20190273435Abstract: A power supply includes a power converter, a reference voltage generator, and a controller. During operation, the power converter produces an output voltage to power a load. The reference voltage generator (such as a voltage mode amplifier circuit) generates a floor reference voltage, a magnitude of which varies as a function of the output voltage. The controller compares an output voltage feedback signal (derived from the output voltage) to the floor reference voltage to produce control output to control timing of activating switches in the power converter to maintain the output voltage within a desired voltage range.Type: ApplicationFiled: March 1, 2018Publication date: September 5, 2019Inventors: Anthony B. Candage, Keng Chen, Paul Sisson
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Patent number: 10327295Abstract: A multi string controller with independent current setting for each string is designed for solid state lighting applications. This controller can regulate multiple channels of LEDs. Each string may have a different forward voltage and current setting. A constant buck regulator is also integrated inside this controller to regulate the total current, which is fed into the LED output channels. The circuit also contains a feedback loop in order to precisely control the current passing through each string and is immune to transient conditions.Type: GrantFiled: December 12, 2016Date of Patent: June 18, 2019Assignee: OSRAM SYLVANIA Inc.Inventors: Andrew Johnsen, Keng Chen, Ming Li, Peng Xiao
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Patent number: 10298123Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.Type: GrantFiled: June 6, 2017Date of Patent: May 21, 2019Assignee: Infineon Technologies Austria AGInventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther
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Publication number: 20190117826Abstract: A preparation at least useful as a bone implant, which contains a solid component including a lithium compound and a calcium compound. The preparation shows an anti-bacterial ability in comparison with a preparation contains the calcium compound but free of the lithium compound.Type: ApplicationFiled: December 18, 2018Publication date: April 25, 2019Applicant: NATIONAL CHENG KUNG UNIVERSITYInventors: Jiin-Huey Chern Lin, Chien-Ping Ju, Chang-Keng Chen, Bing-Chen Yang
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Publication number: 20190103811Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.Type: ApplicationFiled: December 3, 2018Publication date: April 4, 2019Inventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther
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Patent number: 10207023Abstract: A preparation at least useful as a bone implant is provided, which contains a solid component including a lithium compound and a calcium compound. The preparation shows an anti-bacterial ability in comparison with a preparation contains the calcium compound but free of the lithium compound.Type: GrantFiled: May 6, 2013Date of Patent: February 19, 2019Assignee: NATIONAL CHENG KUNG UNIVERSITYInventors: Jiin-Huey Chern-Lin, Chien-Ping Ju, Chang-Keng Chen, Bing-Chen Yang
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Publication number: 20190045595Abstract: A multi string controller with independent current setting for each string is designed for solid state lighting applications. This controller can regulate multiple channels of LEDs. Each string may have a different forward voltage and current setting. A constant buck regulator is also integrated inside this controller to regulate the total current, which is fed into the LED output channels. The circuit also contains a feedback loop in order to precisely control the current passing through each string and is immune to transient conditions.Type: ApplicationFiled: December 12, 2016Publication date: February 7, 2019Applicant: OSRAM SYLVANIA Inc.Inventors: Andrew Johnsen, Keng Chen, Ming Li, Peng Xiao
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Publication number: 20180351452Abstract: A power supply includes a reference voltage generator circuit, a ramp generator circuit, and control circuitry. During operation, the reference voltage generator circuit compares a magnitude of a received output voltage feedback signal to a received reference voltage. Based on the comparison, the reference voltage generator circuit produces a varying reference voltage and outputs it to the ramp generator circuit. As its name suggests, a magnitude of the varying reference voltage varies over time. The ramp generator circuit produces a ramp voltage signal, a magnitude of which is offset by the varying reference voltage. To maintain an output voltage of the power supply within regulation, the control circuitry receives the varying reference voltage and controls activation of a power converter circuit to power a load based on a comparison of the ramp voltage signal and the output voltage feedback signal of the power supply.Type: ApplicationFiled: June 6, 2017Publication date: December 6, 2018Inventors: Danny Clavette, Kang Peng, Keng Chen, Mark A. Crowther