Patents by Inventor Yongjiang Bai
Yongjiang Bai 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: 20180254702Abstract: A control circuit for driving a power switch in a switching power supply can include: a start-up transistor having a drain coupled to a drain of the power switch, and a source coupled to a drain voltage detecting circuit; a gate voltage detecting circuit configured to detect a gate voltage of the power switch, to compare the gate voltage against a first threshold voltage, and to change an on drive current and an off drive current in response thereto; and the drain voltage detecting circuit being configured to detect a drain voltage of the power switch, to compare the drain voltage against a second threshold voltage, and to change the on drive current and the off drive current in response thereto.Type: ApplicationFiled: May 4, 2018Publication date: September 6, 2018Inventors: Shaobin Zhang, Le Li, Zhiliang Hu, Yongjiang Bai
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Publication number: 20180248486Abstract: A control circuit can include: a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter; a sampling time control circuit configured to generate a sampling time control signal according to the blanking control signal and a feedback voltage signal; and a voltage detection circuit configured to receive the feedback voltage signal and the sampling time control signal, and to determine the time of detecting the feedback voltage signal according to the sampling time control signal to obtain a detection signal for controlling the main switch, where the voltage detection circuit stops detecting the feedback voltage signal when the blanking control signal is active, and the period during which the blanking control signal is active is adjustable along with the peak current.Type: ApplicationFiled: May 1, 2018Publication date: August 30, 2018Inventors: Zhiliang Hu, Yongjiang Bai, Qiukai Huang, Le Li
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Patent number: 10063131Abstract: A method of controlling a secondary-side rectifier switch of a flyback converter, can include: detecting a slope parameter of a secondary-side detection voltage along a predetermined direction, where the secondary-side detection voltage is configured to represent a voltage across a secondary winding of the flyback converter; and controlling the secondary-side rectifier switch to turn on when the slope parameter is greater than a slope parameter threshold, and a relationship between the secondary-side detection voltage and the ON threshold meets a predetermined requirement.Type: GrantFiled: May 22, 2017Date of Patent: August 28, 2018Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Xiaoyu Yang, Zhiliang Hu, Yongjiang Bai
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Publication number: 20180241314Abstract: A method of controlling an isolated converter can include: (i) sampling and holding an output voltage of the isolated converter during a present switching cycle to generate a reference voltage signal that is proportional to the output voltage; (ii) comparing, in a predetermined time interval before a next switching cycle, the output voltage against the reference voltage signal, and activating a wake-up signal when the output voltage is less than the reference voltage signal, in order to control a voltage at a secondary winding to represent a variation of the output voltage; (iii) detecting a voltage of the primary winding or the secondary winding, and generating a voltage detection signal; and (iv) controlling the power switch according to the voltage detection signal, in order to maintain the output voltage as an expected voltage.Type: ApplicationFiled: April 20, 2018Publication date: August 23, 2018Inventors: Shaobin Zhang, Yongjiang Bai, Zhiliang Hu, Qiukai Huang
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Patent number: 9985533Abstract: A control circuit can include: a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter; a sampling time control circuit configured to generate a sampling time control signal according to the blanking control signal and a feedback voltage signal; and a voltage detection circuit configured to receive the feedback voltage signal and the sampling time control signal, and to determine the time of detecting the feedback voltage signal according to the sampling time control signal to obtain a detection signal for controlling the main switch, where the voltage detection circuit stops detecting the feedback voltage signal when the blanking control signal is active, and the period during which the blanking control signal is active is adjustable along with the peak current.Type: GrantFiled: January 18, 2017Date of Patent: May 29, 2018Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Zhiliang Hu, Yongjiang Bai, Qiukai Huang, Le Li
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Patent number: 9979292Abstract: A control circuit for driving a power switch in a switching power supply can include: a start-up transistor having a drain coupled to a drain of the power switch, and a source coupled to a drain voltage detecting circuit; a gate voltage detecting circuit configured to detect a gate voltage of the power switch, to compare the gate voltage against a first threshold voltage, and to change an on drive current and an off drive current in response thereto; and the drain voltage detecting circuit being configured to detect a drain voltage of the power switch, to compare the drain voltage against a second threshold voltage, and to change the on drive current and the off drive current in response thereto.Type: GrantFiled: November 11, 2016Date of Patent: May 22, 2018Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Shaobin Zhang, Le Li, Zhiliang Hu, Yongjiang Bai
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Patent number: 9966856Abstract: A method of controlling an isolated converter can include: (i) sampling and holding an output voltage of the isolated converter during a present switching cycle to generate a reference voltage signal that is proportional to the output voltage; (ii) comparing, in a predetermined time interval before a next switching cycle, the output voltage against the reference voltage signal, and activating a wake-up signal when the output voltage is less than the reference voltage signal, in order to control a voltage at a secondary winding to represent a variation of the output voltage; (iii) detecting a voltage of the primary winding or the secondary winding, and generating a voltage detection signal; and (iv) controlling the power switch according to the voltage detection signal, in order to maintain the output voltage as an expected voltage.Type: GrantFiled: July 8, 2015Date of Patent: May 8, 2018Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Shaobin Zhang, Yongjiang Bai, Zhiliang Hu, Qiukai Huang
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Patent number: 9966831Abstract: The present disclosure relates to a controller and a controlling method of a switching power supply. The controller of the switching power supply is used for turning on and off a power transistor so that inductor current flows through an inductor which is connected in series with the power transistor. The controller includes a frequency-jittering signal generating circuit, a superimpose circuit and a first comparator. The frequency-jittering signal generating circuit generates a frequency-jittering signal variable over time. The superimpose circuit superimposes the frequency-jittering signal on a sampling signal of the inductor current to generate a superimposed signal. The first comparator compares the superimposed signal with a control voltage to generate an OFF signal for turning off the power transistor. The controller of the switching power supply reduces conducted electromagnetic interference by a frequency-jittering control on the sampling signal of the inductor current.Type: GrantFiled: November 30, 2015Date of Patent: May 8, 2018Assignee: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD.Inventors: Dan Zhang, Zhiliang Hu, Qiukai Huang, Yongjiang Bai, Le Li
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Patent number: 9906140Abstract: A power supply circuit for a switching power supply including a power switch configured to receive a DC input voltage, can include: a switching control circuit configured to receive a charge voltage signal of a charge capacitor, a reference voltage signal, and a PWM control signal, and to generate a switching control signal; a control unit having a supply voltage from the charge capacitor, where the charge capacitor includes a first terminal coupled to the switching control circuit, and a second terminal coupled to ground; and where when the switching power supply is in a start-up phase, the power switch is turned on, the first switch is turned off, and the DC input voltage charge the charges capacitor through the power switch, and the control unit begins operating when the charge voltage signal reaches a level of starting voltage of the control unit.Type: GrantFiled: May 6, 2016Date of Patent: February 27, 2018Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Shaobin Zhang, Zhiliang Hu, Yongjiang Bai, Jin Jin
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Publication number: 20170353099Abstract: A method of controlling a secondary-side rectifier switch of a flyback converter, can include: detecting a slope parameter of a secondary-side detection voltage along a predetermined direction, where the secondary-side detection voltage is configured to represent a voltage across a secondary winding of the flyback converter; and controlling the secondary-side rectifier switch to turn on when the slope parameter is greater than a slope parameter threshold, and a relationship between the secondary-side detection voltage and the ON threshold meets a predetermined requirement.Type: ApplicationFiled: May 22, 2017Publication date: December 7, 2017Inventors: Xiaoyu Yang, Zhiliang Hu, Yongjiang Bai
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Patent number: 9825538Abstract: A voltage sampling control circuit can include: a bleeder circuit that generates a sampling signal by sampling a voltage across a winding of a transformer of an isolated switching power supply; a blanking time signal control circuit that activates a first blanking time signal when the sampling signal is higher than a first reference voltage, and activates a second blanking time signal when the sampling signal rises to a level of a second reference voltage, where active portions of the first and second blanking time signals overlap, and the sampling signal is not detected during activation of either of the first and second blanking time signals; a converter configured to convert the sampling signal to a detection signal after both of the first and second blanking time signals have been deactivated; and a sample and hold circuit configured to receive the detection signal, and to generate a feedback signal.Type: GrantFiled: October 17, 2016Date of Patent: November 21, 2017Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Shaobin Zhang, Zhiliang Hu, Yongjiang Bai
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Patent number: 9774264Abstract: A control circuit can include: an output current sampling circuit configured to sample a current through a power switch of a switching power supply operating in a quasi-resonant mode, and to generate an output current feedback signal that represents an output current of the switching power supply; and a valley locking circuit configured to receive the output current feedback signal and a plurality of valley switching threshold voltages, where the valley locking circuit is switched to a corresponding valley from a valley currently being locked when the output current feedback signal is increased or reduced to one of the plurality of valley switching threshold voltages.Type: GrantFiled: August 8, 2016Date of Patent: September 26, 2017Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Xiaoyu Yang, Yongjiang Bai
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Patent number: 9762128Abstract: Controlling an isolated converter can include: controlling a first voltage signal across the secondary winding according to a wake-up signal to reflect change of an output voltage of the isolated converter; obtaining a second voltage signal representing the first voltage signal at the primary side; controlling the main power switch according to a detection result of the second voltage signal; generating the wake-up signal according to the output voltage and a first threshold voltage when the isolated converter is in a dynamic loading state of a normal operating mode; generating the wake-up signal according to the output voltage and a second threshold voltage when the isolated converter is in a load steady state of a standby operating mode; and generating the wake-up signal according to the output voltage and a third threshold voltage when the isolated converter is in a dynamic loading state of the standby operating mode.Type: GrantFiled: April 15, 2016Date of Patent: September 12, 2017Assignee: Silergy Semiconductor Technology (Hangzhou) LTDInventors: Shaobin Zhang, Yongjiang Bai, Zhiliang Hu, Le Li, Jinping Dong
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Publication number: 20170214326Abstract: A control circuit can include: a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter; a sampling time control circuit configured to generate a sampling time control signal according to the blanking control signal and a feedback voltage signal; and a voltage detection circuit configured to receive the feedback voltage signal and the sampling time control signal, and to determine the time of detecting the feedback voltage signal according to the sampling time control signal to obtain a detection signal for controlling the main switch, where the voltage detection circuit stops detecting the feedback voltage signal when the blanking control signal is active, and the period during which the blanking control signal is active is adjustable along with the peak current.Type: ApplicationFiled: January 18, 2017Publication date: July 27, 2017Inventors: Zhiliang Hu, Yongjiang Bai, Qiukai Huang, Le Li
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Publication number: 20170155322Abstract: A control circuit for driving a power switch in a switching power supply can include: a start-up transistor having a drain coupled to a drain of the power switch, and a source coupled to a drain voltage detecting circuit; a gate voltage detecting circuit configured to detect a gate voltage of the power switch, to compare the gate voltage against a first threshold voltage, and to change an on drive current and an off drive current in response thereto; and the drain voltage detecting circuit being configured to detect a drain voltage of the power switch, to compare the drain voltage against a second threshold voltage, and to change the on drive current and the off drive current in response thereto.Type: ApplicationFiled: November 11, 2016Publication date: June 1, 2017Inventors: Shaobin Zhang, Le Li, Zhiliang Hu, Yongjiang Bai
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Publication number: 20170133939Abstract: A voltage sampling control circuit can include: a bleeder circuit that generates a sampling signal by sampling a voltage across a winding of a transformer of an isolated switching power supply; a blanking time signal control circuit that activates a first blanking time signal when the sampling signal is higher than a first reference voltage, and activates a second blanking time signal when the sampling signal rises to a level of a second reference voltage, where active portions of the first and second blanking time signals overlap, and the sampling signal is not detected during activation of either of the first and second blanking time signals; a converter configured to convert the sampling signal to a detection signal after both of the first and second blanking time signals have been deactivated; and a sample and hold circuit configured to receive the detection signal, and to generate a feedback signal.Type: ApplicationFiled: October 17, 2016Publication date: May 11, 2017Inventors: Shaobin Zhang, Zhiliang Hu, Yongjiang Bai
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Publication number: 20170063241Abstract: A control circuit can include: an output current sampling circuit configured to sample a current through a power switch of a switching power supply operating in a quasi-resonant mode, and to generate an output current feedback signal that represents an output current of the switching power supply; and a valley locking circuit configured to receive the output current feedback signal and a plurality of valley switching threshold voltages, where the valley locking circuit is switched to a corresponding valley from a valley currently being locked when the output current feedback signal is increased or reduced to one of the plurality of valley switching threshold voltages.Type: ApplicationFiled: August 8, 2016Publication date: March 2, 2017Inventors: Xiaoyu Yang, Yongjiang Bai
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Publication number: 20170025957Abstract: A voltage sense control circuit configured for an isolated converter can include: a current sampling and holding circuit configured to sample a current through a power switch to obtain a voltage sense signal that represents current information of the power switch, where the voltage sense signal is in proportion to a forward voltage drop of a rectifier device; a compensation signal generating circuit configured to generate a first current signal according to the voltage sense signal, and to generate a compensation signal according to the first current signal to compensate an output voltage feedback signal of the isolated converter to obtain a voltage feedback signal; and a voltage sampling and holding circuit configured to sample and hold the voltage feedback signal to regulate an output voltage of the isolated converter to be stable.Type: ApplicationFiled: July 1, 2016Publication date: January 26, 2017Inventors: Shaobin Zhang, Xiaoru Xu, Zhiliang Hu, Yongjiang Bai
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Publication number: 20160344294Abstract: A power supply circuit for a switching power supply including a power switch configured to receive a DC input voltage, can include: a switching control circuit configured to receive a charge voltage signal of a charge capacitor, a reference voltage signal, and a PWM control signal, and to generate a switching control signal; a control unit having a supply voltage from the charge capacitor, where the charge capacitor includes a first terminal coupled to the switching control circuit, and a second terminal coupled to ground; and where when the switching power supply is in a start-up phase, the power switch is turned on, the first switch is turned off, and the DC input voltage charge the charges capacitor through the power switch, and the control unit begins operating when the charge voltage signal reaches a level of starting voltage of the control unit.Type: ApplicationFiled: May 6, 2016Publication date: November 24, 2016Inventors: Shaobin Zhang, Zhiliang Hu, Yongjiang Bai, Jin Jin
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Publication number: 20160329816Abstract: Controlling an isolated converter can include: controlling a first voltage signal across the secondary winding according to a wake-up signal to reflect change of an output voltage of the isolated converter; obtaining a second voltage signal representing the first voltage signal at the primary side; controlling the main power switch according to a detection result of the second voltage signal; generating the wake-up signal according to the output voltage and a first threshold voltage when the isolated converter is in a dynamic loading state of a normal operating mode; generating the wake-up signal according to the output voltage and a second threshold voltage when the isolated converter is in a load steady state of a standby operating mode; and generating the wake-up signal according to the output voltage and a third threshold voltage when the isolated converter is in a dynamic loading state of the standby operating mode.Type: ApplicationFiled: April 15, 2016Publication date: November 10, 2016Inventors: Shaobin Zhang, Yongjiang Bai, Zhiliang Hu, Le Li, Jinping Dong