Patents by Inventor Siqiang Fan
Siqiang Fan 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: 11171501Abstract: Embodiments described herein provides a battery charging circuit that boosts an input current and feeds the boosted input current to a battery for fast charging. Specifically, the battery charging circuit includes a low dropout regulator (LDO) for providing a voltage, a switch mode charger, coupled between the LDO and a battery, and a capacitor divider, coupled between the LDO and the battery, in parallel to the switch mode charger, for dividing the voltage outputted from the LDO by a factor.Type: GrantFiled: March 28, 2019Date of Patent: November 9, 2021Assignee: Integrated Device Technology, Inc.Inventors: Siqiang Fan, Sercan Ipek, Eric Huang, Turev Acar
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Patent number: 10963764Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: July 12, 2019Date of Patent: March 30, 2021Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Publication number: 20200212702Abstract: Embodiments described herein provides a battery charging circuit that boosts an input current and feeds the boosted input current to a battery for fast charging. Specifically, the battery charging circuit includes a low dropout regulator (LDO) for providing a voltage, a switch mode charger, coupled between the LDO and a battery, and a capacitor divider, coupled between the LDO and the battery, in parallel to the switch mode charger, for dividing the voltage outputted from the LDO by a factor.Type: ApplicationFiled: March 28, 2019Publication date: July 2, 2020Inventors: Siqiang FAN, Sercan IPEK, Eric HUANG, Turev ACAR
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Patent number: 10699175Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: March 27, 2019Date of Patent: June 30, 2020Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Patent number: 10637356Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.Type: GrantFiled: April 3, 2018Date of Patent: April 28, 2020Assignee: Integrated Device Technology, Inc.Inventors: Gustavo Mehas, Rui Liu, Lijie Zhao, Siqiang Fan, Tae Kwang Park, Zhitong Guo
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Publication number: 20190332909Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: July 12, 2019Publication date: October 31, 2019Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Publication number: 20190325280Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: March 27, 2019Publication date: October 24, 2019Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Patent number: 10360485Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: GrantFiled: August 28, 2017Date of Patent: July 23, 2019Assignee: Integrated Device Technology, Inc.Inventors: Rui Liu, Tao Qi, Lijie Zhao, Gustavo James Mehas, Tae Kwang Park, Zhitong Guo, Siqiang Fan
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Publication number: 20180287497Abstract: A power converter control circuit includes a first ramp generator connected to an input voltage and configured to produce a first ramp signal; a second ramp generator connected to the input voltage and configured to produce a second ramp signal; an error amplifier configured to produce an error amplifier output. The first ramp signal and the error amplifier output are used to produce a first (pulse width modulation) PWM signal and the second ramp signal and the error amplifier output are used to produce a second PWM signal. The first and second PWM signals control an operating state of the circuit. In some embodiments, the first ramp signal includes an extended ramp reset time. In some embodiments, the first ramp generator includes a switching device, a current source, and a capacitor.Type: ApplicationFiled: April 3, 2018Publication date: October 4, 2018Inventors: Gustavo MEHAS, Rui LIU, Lijie ZHAO, Siqiang FAN, Tae Kwang PARK, Zhitong GUO
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Publication number: 20180060712Abstract: According to another embodiment, a system includes a driver circuit that drives a first output and a second output; a coil coupled between the first output and the second output such that the driver circuit drives current through the coil in response to control signals; and a programmable slew circuit coupled to the driver circuit. In some embodiments, a switch is coupled between the first output and the coil. In some embodiments an over-voltage protection circuit is coupled to protect the driver circuit.Type: ApplicationFiled: August 28, 2017Publication date: March 1, 2018Inventors: Rui LIU, Tao QI, Lijie ZHAO, Gustavo James MEHAS, Tae Kwang PARK, Zhitong GUO, Siqiang FAN
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Patent number: 9590501Abstract: The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference voltage for use in controlling the generation of the output voltage. The dynamic reference generation circuitry may be configured to generate a dynamic reference voltage as the input voltage for the power supply circuitry based on the reference voltage and the output voltage.Type: GrantFiled: April 25, 2013Date of Patent: March 7, 2017Assignee: Fairchild Semiconductor CorporationInventors: Bin Zhao, Siqiang Fan
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Publication number: 20140320327Abstract: A system for scalable voltage ramp control for power supply systems. A system may comprise at least power supply circuitry, digital-to-analog (D/A) converter circuitry and a controller. The power supply circuitry may be configured to output a voltage to a load based on an input voltage provided by the D/A converter. The controller may be configured to control the D/A converter (e.g., to cause the D/A converter to provide the input voltage to the power supply circuitry) using a large range voltage ramp-up or a small range voltage ramp-up. Utilization of the large range voltage ramp-up or the small range voltage ramp-up by the controller may be based on, for example, a threshold voltage.Type: ApplicationFiled: April 25, 2013Publication date: October 30, 2014Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Siqiang Fan, Andrew Kameya, Bin Zhao
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Publication number: 20140320093Abstract: The present disclosure is directed to a fast load transient response power supply system using dynamic reference voltage generation. A system may comprise, for example, at least power supply circuitry, voltage reference circuitry and dynamic reference generation circuitry. The power supply circuitry may be configured to generate an output voltage (e.g., for driving a load) based on a power supply input voltage. The voltage reference circuitry may be configured to generate a reference voltage for use in controlling the generation of the output voltage. The dynamic reference generation circuitry may be configured to generate a dynamic reference voltage as the input voltage for the power supply circuitry based on the reference voltage and the output voltage.Type: ApplicationFiled: April 25, 2013Publication date: October 30, 2014Applicant: FAIRCHILD SEMICONDUCTOR CORPORATIONInventors: Bin Zhao, Siqiang Fan
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Patent number: 8860595Abstract: A system for scalable voltage ramp control for power supply systems. A system may comprise at least power supply circuitry, digital-to-analog (D/A) converter circuitry and a controller. The power supply circuitry may be configured to output a voltage to a load based on an input voltage provided by the D/A converter. The controller may be configured to control the D/A converter (e.g., to cause the D/A converter to provide the input voltage to the power supply circuitry) using a large range voltage ramp-up or a small range voltage ramp-up. Utilization of the large range voltage ramp-up or the small range voltage ramp-up by the controller may be based on, for example, a threshold voltage.Type: GrantFiled: April 25, 2013Date of Patent: October 14, 2014Assignee: Fairchild Semiconductor CorporationInventors: Siqiang Fan, Andrew Kameya, Bin Zhao