Patents by Inventor Che-Hao Meng
Che-Hao Meng 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: 11916487Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.Type: GrantFiled: March 24, 2022Date of Patent: February 27, 2024Assignee: Power Forest Technology CorporationInventors: Chao-Chang Chiu, Kuan-Chun Fang, Yueh-Chang Chen, Tzu-Chi Huang, Che-Hao Meng
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Publication number: 20230261580Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.Type: ApplicationFiled: March 24, 2022Publication date: August 17, 2023Applicant: Power Forest Technology CorporationInventors: Chao-Chang Chiu, Kuan-Chun Fang, Yueh-Chang Chen, Tzu-Chi Huang, Che-Hao Meng
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Patent number: 11088660Abstract: A power supply configured to supply a modulated voltage to a power amplifier is shown. The power supply has an alternating current (AC) component generator, a direct current (DC) component generator, and a transition accelerator. The AC component generator generates an AC component of the modulated voltage according to an envelope tracking signal. The DC component generator generates a DC component of the modulated voltage according to the operational voltage range of the power amplifier. The transition accelerator is coupled to an output terminal of the DC component generator to speed up the transition of the modulated voltage.Type: GrantFiled: December 27, 2019Date of Patent: August 10, 2021Assignee: MEDIATEK INC.Inventors: Shih-Mei Lin, Chien-Wei Kuan, Che-Hao Meng, Chen-Yen Ho
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Publication number: 20200244225Abstract: A power supply configured to supply a modulated voltage to a power amplifier is shown. The power supply has an alternating current (AC) component generator, a direct current (DC) component generator, and a transition accelerator. The AC component generator generates an AC component of the modulated voltage according to an envelope tracking signal. The DC component generator generates a DC component of the modulated voltage according to the operational voltage range of the power amplifier. The transition accelerator is coupled to an output terminal of the DC component generator to speed up the transition of the modulated voltage.Type: ApplicationFiled: December 27, 2019Publication date: July 30, 2020Inventors: Shih-Mei LIN, Chien-Wei KUAN, Che-Hao MENG, Chen-Yen HO
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Patent number: 10673385Abstract: A supply modulator, a modulated power supply circuit, and associated control method are provided. The modulated power supply circuit includes the supply modulator and a DC-DC voltage converter, and the supply modulator includes a linear amplifier and a switching converter. The linear amplifier generates an AC component of a modulated voltage according to a regulated voltage and an envelope tracking signal. The supply voltage is converted to the regulated voltage by the DC-DC voltage converter, and the regulated voltage is greater than or less than the supply voltage. The switching converter includes a step-down circuit and a path selection circuit. The path selection circuit selects one of the supply voltage and the regulated voltage as a DC input voltage. The step-down circuit converts the DC input voltage to a DC component of the modulated voltage which is less than the DC input voltage.Type: GrantFiled: July 20, 2018Date of Patent: June 2, 2020Assignee: MEDIATEK INC.Inventors: Shih-Mei Lin, Che-Hao Meng, Da-Wei Sung, Chien-Wei Kuan
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Publication number: 20190140597Abstract: A supply modulator, a modulated power supply circuit, and associated control method are provided. The modulated power supply circuit includes the supply modulator and a DC-DC voltage converter, and the supply modulator includes a linear amplifier and a switching converter. The linear amplifier generates an AC component of a modulated voltage according to a regulated voltage and an envelope tracking signal. The supply voltage is converted to the regulated voltage by the DC-DC voltage converter, and the regulated voltage is greater than or less than the supply voltage. The switching converter includes a step-down circuit and a path selection circuit. The path selection circuit selects one of the supply voltage and the regulated voltage as a DC input voltage. The step-down circuit converts the DC input voltage to a DC component of the modulated voltage which is less than the DC input voltage.Type: ApplicationFiled: July 20, 2018Publication date: May 9, 2019Inventors: Shih-Mei LIN, Che-Hao MENG, Da-Wei SUNG, Chien-Wei KUAN
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Patent number: 10122258Abstract: A DC-DC converter includes an inductor, a switch module, and a pull-up circuit or a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, the first current or the second current is determined based on an inductor current flowing through the inductor.Type: GrantFiled: November 30, 2017Date of Patent: November 6, 2018Assignee: MEDIATEK INC.Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chien-Lung Lee, Che-Hao Meng
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Publication number: 20180083526Abstract: A DC-DC converter includes an inductor, a switch module, and a pull-up circuit or a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, the first current or the second current is determined based on an inductor current flowing through the inductor.Type: ApplicationFiled: November 30, 2017Publication date: March 22, 2018Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chien-Lung Lee, Che-Hao Meng
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Patent number: 9912306Abstract: Provided is a power supply circuit for a wireless mobile device having a plurality of power amplification components. The power supply circuit includes: a first DC-DC converter, for providing at least one constant output voltage (which is provided to the power amplification components) and/or at least one DC intermediate voltage; a second DC-DC converter, for providing a DC component of at least one time-varying output voltage; and at least one linear amplifier. When the at least one linear amplifier receives the at least one DC intermediate voltage from the first DC-DC converter, the at least one linear amplifier provides at least one AC component of the at least one time-varying output voltage. The DC component and the at least one AC component of the at least one time-varying output voltage are combined into the at least one time-varying output voltage and provided to the power amplification components.Type: GrantFiled: April 20, 2017Date of Patent: March 6, 2018Assignee: MEDIATEK INC.Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chen-Yen Ho, Che-Hao Meng, Tso-Min Chen, Chia-Sheng Peng, Sheng-Hong Yan
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Publication number: 20180048272Abstract: Provided is a power supply circuit for a wireless mobile device having a plurality of power amplification components. The power supply circuit includes: a first DC-DC converter, for providing at least one constant output voltage (which is provided to the power amplification components) and/or at least one DC intermediate voltage; a second DC-DC converter, for providing a DC component of at least one time-varying output voltage; and at least one linear amplifier. When the at least one linear amplifier receives the at least one DC intermediate voltage from the first DC-DC converter, the at least one linear amplifier provides at least one AC component of the at least one time-varying output voltage. The DC component and the at least one AC component of the at least one time-varying output voltage are combined into the at least one time-varying output voltage and provided to the power amplification components.Type: ApplicationFiled: April 20, 2017Publication date: February 15, 2018Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chen-Yen Ho, Che-Hao Meng, Tso-Min Chen, Chia-Sheng Peng, Sheng-Hong Yan
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Patent number: 9866119Abstract: A DC-DC converter includes an inductor, a switch module, a pull-up circuit and a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, at least one of the first current provided by the pull-up circuit and the second current sunk by the pull-down circuit is determined based on an inductor current flowing through the inductor.Type: GrantFiled: July 5, 2016Date of Patent: January 9, 2018Assignee: MEDIATEK INC.Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chien-Lung Lee, Che-Hao Meng
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Publication number: 20170222556Abstract: A DC-DC converter includes an inductor, a switch module, a pull-up circuit and a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, at least one of the first current provided by the pull-up circuit and the second current sunk by the pull-down circuit is determined based on an inductor current flowing through the inductor.Type: ApplicationFiled: July 5, 2016Publication date: August 3, 2017Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chien-Lung Lee, Che-Hao Meng
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Patent number: 9570990Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.Type: GrantFiled: May 19, 2015Date of Patent: February 14, 2017Assignee: NOVATEK Microelectronics Corp.Inventors: Ke-Horng Chen, Chao-Chang Chiu, Hao-Yuan Lin, Che-Hao Meng, Chih-Wei Chang, Ying-Hsiang Wang
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Publication number: 20160211755Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.Type: ApplicationFiled: May 19, 2015Publication date: July 21, 2016Inventors: Ke-Horng Chen, Chao-Chang Chiu, Hao-Yuan Lin, Che-Hao Meng, Chih-Wei Chang, Ying-Hsiang Wang
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Publication number: 20160105096Abstract: A power factor correction (PFC) controller and a power supply apparatus using the same are provided. The PFC controller includes a driving signal generation circuit and a zero-current prediction circuit. The driving signal generation circuit generates a driving signal to drive a power switch according to a control signal, where the power switch is switched in response to the driving signal, so as to convert an input voltage into an output voltage. The zero-current prediction circuit is coupled to the driving signal generation circuit and performs a capacitance charge/discharge operation, and thus obtains a charge/discharge time characteristic related to a zero-current timing. The zero-current prediction circuit generates the control signal to control operation of the driving signal generation circuit according to the charge/discharge time characteristic.Type: ApplicationFiled: October 13, 2014Publication date: April 14, 2016Inventors: Ke-Horng Chen, Hsin-Yu Luo, Wen-Jiun Liu, Che-Hao Meng, Chih-Wei Chang