Patents by Inventor Rengang Chen
Rengang 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: 11949320Abstract: A device includes a current mirror, a switch, first and second current paths, first and second buffers, a variable resistor, a temperature-sensing circuit, and a controller. The first current path is coupled between the current mirror's input and the switch. The switch switches between ground and a transistor based on a control signal. The second current path is coupled between a first current mirror output and ground. The first buffer is coupled to a second current mirror output. The second buffer is coupled to the variable resistor, which is coupled to the first buffer. The temperature-sensing circuit provides a device temperature to the controller, which is coupled to a first buffer output and determines a first adjustment to the first and second current paths and a second adjustment to the variable resistor based on the device temperature.Type: GrantFiled: February 23, 2022Date of Patent: April 2, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Vishnuvardhan Reddy Jaladanki, Preetam Charan Anand Tadeparthy, Scott Ragona, Rengang Chen, Evan Michael Reutzel, Bhaskar Ramachandran
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Publication number: 20240039406Abstract: A DC-DC converter includes a current sense circuit. The current sense circuit includes a sense current output, an inductor current measurement circuit, an inductor current emulation circuit, a first switch, and a second switch. The inductor current measurement circuit has an output. The inductor current emulation circuit has an output. The first switch is coupled between the output of the inductor current measurement circuit and the sense current output. The second switch is coupled between the output of the inductor current emulation circuit and the sense current output.Type: ApplicationFiled: July 27, 2022Publication date: February 1, 2024Inventors: Rengang CHEN, Bo WANG, Evan REUTZEL, Dattatreya Baragur SURYANARAYANA, Bhaskar RAMACHANDRAN, Preetam TADEPARTHY
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Publication number: 20230400490Abstract: In an example, a circuit includes an emulated current generator configured to provide an emulated current signal responsive to a charge current and a discharge current. The emulated current signal can be representative of an emulated current through an output inductor. A comparator is configured to provide a comparator signal responsive to the emulated current signal and sensed current signal representative of a measure of current through the output inductor. An inductor code counter is configured to adjust an inductor code count value responsive to the comparator signal. A slope of the emulated current signal can be adjusted responsive to the inductor code count value.Type: ApplicationFiled: August 30, 2022Publication date: December 14, 2023Inventors: Rengang CHEN, Bo WANG, Evan REUTZEL, Dattatreya Baragur SURYANARAYANA, Bhaskar RAMACHANDRAN, Preetam TADEPARTHY
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Patent number: 11682900Abstract: A system includes a first power stage circuit having a first PWM input, a first voltage input and a first power output. The first power stage circuit is configured to provide a first current at the first power output responsive to a PWM signal at the first PWM input, and configured to receive a voltage at the first voltage input. The system includes a second power stage circuit having a second PWM input, a second voltage input and a second power output. The second voltage input is coupled to the first voltage input, and the second power stage circuit is configured to provide a second current at the second power output responsive to the PWM signal at the second PWM input. The second power stage circuit is configured to receive the voltage at the second voltage input, the voltage representing an average of the first current and the second current.Type: GrantFiled: June 4, 2021Date of Patent: June 20, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Rajesh Venugopal, Matthew John Ascher Schurmann, Preetam Charan Anand Tadeparthy, Rengang Chen
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Patent number: 11588400Abstract: Aspects of series resonator DC-to-DC converters are described. A series resonator DC-to-DC converter can include a first half-bridge circuit comprising a first high-side switch and a first low-side switch, a second half-bridge circuit comprising a second high-side switch and a second low-side switch, and a resonator in series between the first high-side switch and the first low-side switch. The circuit design and switching controller can be relied upon to impart soft-switching.Type: GrantFiled: January 21, 2021Date of Patent: February 21, 2023Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Cong Tu, Khai Doan The Ngo, Ting Ge, Rengang Chen
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Patent number: 11569744Abstract: A converter stage having a control pin, an input voltage pin, an output pin, a ground pin, a high-side switch coupled between the input voltage pin and the output pin, a low-side switch coupled between the output pin and the ground pin, a current sensor configured to detect a current at the output pin, and control logic coupled to the control pin and the current sensor. The control logic is configured to control switching of the high-side and the low-side switches in continuous conduction mode, discontinuous conduction mode, and body braking control for the converter stage in response to a first signal received via the control line and a second signal received from the current sensor. A driver controls switching, based on the detected current and sequential event tracking, between an on state and an off state.Type: GrantFiled: January 19, 2021Date of Patent: January 31, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Scott Edward Ragona, Rengang Chen, Preetam Charan Anand Tadeparthy, Evan Michael Reutzel
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Publication number: 20220393464Abstract: A system includes a first power stage circuit having a first PWM input, a first voltage input and a first power output. The first power stage circuit is configured to provide a first current at the first power output responsive to a PWM signal at the first PWM input, and configured to receive a voltage at the first voltage input. The system includes a second power stage circuit having a second PWM input, a second voltage input and a second power output. The second voltage input is coupled to the first voltage input, and the second power stage circuit is configured to provide a second current at the second power output responsive to the PWM signal at the second PWM input. The second power stage circuit is configured to receive the voltage at the second voltage input, the voltage representing an average of the first current and the second current.Type: ApplicationFiled: June 4, 2021Publication date: December 8, 2022Inventors: Rajesh VENUGOPAL, Matthew John Ascher SCHURMANN, Preetam Charan Anand TADEPARTHY, Rengang CHEN
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Publication number: 20220271664Abstract: A device includes a current mirror, a switch, first and second current paths, first and second buffers, a variable resistor, a temperature-sensing circuit, and a controller. The first current path is coupled between the current mirror's input and the switch. The switch switches between ground and a transistor based on a control signal. The second current path is coupled between a first current mirror output and ground. The first buffer is coupled to a second current mirror output. The second buffer is coupled to the variable resistor, which is coupled to the first buffer. The temperature-sensing circuit provides a device temperature to the controller, which is coupled to a first buffer output and determines a first adjustment to the first and second current paths and a second adjustment to the variable resistor based on the device temperature.Type: ApplicationFiled: February 23, 2022Publication date: August 25, 2022Inventors: Vishnuvardhan Reddy JALADANKI, Preetam Charan Anand TADEPARTHY, Scott RAGONA, Rengang CHEN, Evan Michael REUTZEL, Bhaskar RAMACHANDRAN
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Publication number: 20220231609Abstract: Aspects of series resonator DC-to-DC converters are described. A series resonator DC-to-DC converter can include a first half-bridge circuit comprising a first high-side switch and a first low-side switch, a second half-bridge circuit comprising a second high-side switch and a second low-side switch, and a resonator in series between the first high-side switch and the first low-side switch. The circuit design and switching controller can be relied upon to impart soft-switching.Type: ApplicationFiled: January 21, 2021Publication date: July 21, 2022Inventors: Cong Tu, Khai Doan The Ngo, Ting Ge, Rengang Chen
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Publication number: 20220231605Abstract: A converter stage having a control pin, an input voltage pin, an output pin, a ground pin, a high-side switch coupled between the input voltage pin and the output pin, a low-side switch coupled between the output pin and the ground pin, a current sensor configured to detect a current at the output pin, and control logic coupled to the control pin and the current sensor. The control logic is configured to control switching of the high-side and the low-side switches in continuous conduction mode, discontinuous conduction mode, and body braking control for the converter stage in response to a first signal received via the control line and a second signal received from the current sensor. A driver controls switching, based on the detected current and sequential event tracking, between an on state and an off state.Type: ApplicationFiled: January 19, 2021Publication date: July 21, 2022Inventors: Scott Edward Ragona, Rengang Chen, Preetam Charan Anand Tadeparthy, Evan Michael Reutzel
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Patent number: 10630183Abstract: A switching converter having a high-side switching transistor and a low-side switching transistor and an inductor, having a circuit for generating a simulated waveform representing a sawtooth inductor current waveform. A circuit for monitoring and voltage at a switch node between the high-side and low-side transistors to determine a time during which the inductor current is increasing and a time during which the inductor current is decreasing wherein voltage across the low-side transistor when it is conducting represents a first portion of the simulated sawtooth inductor current waveform. A circuit for utilizing the time when the inductor current is increasing, the time when the inductor current is decreasing and the voltage across the low-side transistor when it is conducting to generate a portion of the simulated inductor current waveform when the high-side transistor is conducting. A method and a power supply utilizing this circuit are also disclosed.Type: GrantFiled: April 2, 2018Date of Patent: April 21, 2020Assignee: Texas Instruments IncorporatedInventors: Scott E. Ragona, Rengang Chen, David Jauregui
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Publication number: 20180226892Abstract: A switching converter having a high-side switching transistor and a low-side switching transistor and an inductor, having a circuit for generating a simulated waveform representing a sawtooth inductor current waveform. A circuit for monitoring and voltage at a switch node between the high-side and low-side transistors to determine a time during which the inductor current is increasing and a time during which the inductor current is decreasing wherein voltage across the low-side transistor when it is conducting represents a first portion of the simulated sawtooth inductor current waveform. A circuit for utilizing the time when the inductor current is increasing, the time when the inductor current is decreasing and the voltage across the low-side transistor when it is conducting to generate a portion of the simulated inductor current waveform when the high-side transistor is conducting. A method and a power supply utilizing this circuit are also disclosed.Type: ApplicationFiled: April 2, 2018Publication date: August 9, 2018Inventors: Scott E. Ragona, Rengang Chen, David Jauregui
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Patent number: 9966855Abstract: A switching converter having a high-side switching transistor and a low-side switching transistor and an inductor, having a circuit for generating a simulated waveform representing a sawtooth inductor current waveform. A circuit for monitoring and voltage at a switch node between the high-side and low-side transistors to determine a time during which the inductor current is increasing and a time during which the inductor current is decreasing wherein voltage across the low-side transistor when it is conducting represents a first portion of the simulated sawtooth inductor current waveform. A circuit for utilizing the time when the inductor current is increasing, the time when the inductor current is decreasing and the voltage across the low-side transistor when it is conducting to generate a portion of the simulated inductor current waveform when the high-side transistor is conducting. A method and a power supply utilizing this circuit are also disclosed.Type: GrantFiled: October 20, 2014Date of Patent: May 8, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Scott E. Ragona, Rengang Chen, David Jauregui
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Publication number: 20150097539Abstract: A switching converter having a high-side switching transistor and a low-side switching transistor and an inductor, having a circuit for generating a simulated waveform representing a sawtooth inductor current waveform. A circuit for monitoring and voltage at a switch node between the high-side and low-side transistors to determine a time during which the inductor current is increasing and a time during which the inductor current is decreasing wherein voltage across the low-side transistor when it is conducting represents a first portion of the simulated sawtooth inductor current waveform. A circuit for utilizing the time when the inductor current is increasing, the time when the inductor current is decreasing and the voltage across the low-side transistor when it is conducting to generate a portion of the simulated inductor current waveform when the high-side transistor is conducting. A method and a power supply utilizing this circuit are also disclosed.Type: ApplicationFiled: October 20, 2014Publication date: April 9, 2015Inventors: Scott E. Ragona, Rengang Chen, David Jauregui
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Patent number: 8866464Abstract: Systems and methods for regulating a switching converter are disclosed. One embodiment of the present invention relates to a power supply system that includes a switching converter that provides an output voltage by alternately turning on and off a high-side transistor and a low-side transistor both coupled to an output inductor through a switching node. The switching converter includes a drive circuit that regulates the output voltage based on a feedback signal. The power supply system also includes a simulated output generator that generates and provides the drive circuit with a simulated inductor waveform as the feedback signal based on a low-side output waveform of the low-side transistor measured at the switching node during off-times of the switching converter.Type: GrantFiled: December 15, 2011Date of Patent: October 21, 2014Assignee: Texas Instruments IncorporatedInventors: Scott E. Ragona, Rengang Chen, David Jauregui
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Publication number: 20130154590Abstract: Systems and methods for regulating a switching converter are disclosed. One embodiment of the present invention relates to a power supply system that comprises a switching converter that provides an output voltage by alternately turning on and off a high-side transistor and a low-side transistor both coupled to an output inductor through a switching node. The switching converter includes a drive circuit that regulates the output voltage based on a feedback signal. The power supply system also comprises a simulated output generator that generates and provides the drive circuit with a simulated inductor waveform as the feedback signal based on a low-side output waveform of the low-side transistor measured at the switching node during off-times of the switching converter.Type: ApplicationFiled: December 15, 2011Publication date: June 20, 2013Inventors: SCOTT E. RAGONA, RENGANG CHEN, David Jauregui
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Patent number: 7755342Abstract: A circuit for transitioning between a discontinuous and a fixed frequency continuous conduction mode (DCM) and (CCM) of a power converter having a driver receiving PWM signals and controlling a switching stage comprises a control switch and a sync switch connected at a common switching node for driving a load.Type: GrantFiled: May 2, 2007Date of Patent: July 13, 2010Assignee: International Rectifier CorporationInventors: Rengang Chen, James Steven Brown
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Publication number: 20080042709Abstract: A circuit for transitioning between a discontinuous and a fixed frequency continuous conduction mode (DCM) and (CCM) of a power converter having a driver receiving PWM signals and controlling a switching stage comprises a control switch and a sync switch connected at a common switching node for driving a load.Type: ApplicationFiled: May 2, 2007Publication date: February 21, 2008Inventors: Rengang Chen, James Brown