Patents by Inventor Yung-Chih Yen

Yung-Chih Yen 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).

  • Publication number: 20210013741
    Abstract: A multi-mode wireless power transmitter includes a first drive circuit of a first type and a second drive circuit of a second type. The first drive circuit is configured to drive a first transmit coil at a first frequency. The second drive circuit is configured to drive a second transmit coil at a second frequency higher than the first frequency.
    Type: Application
    Filed: September 30, 2020
    Publication date: January 14, 2021
    Applicant: MediaTek Inc.
    Inventors: Vladimir A. Muratov, Yung-Chih Yen
  • Patent number: 10826300
    Abstract: A multi-mode wireless power transmitter includes a first drive circuit of a first type and a second drive circuit of a second type. The first drive circuit is configured to drive a first transmit coil at a first frequency. The second drive circuit is configured to drive a second transmit coil at a second frequency higher than the first frequency.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: November 3, 2020
    Assignee: MediaTek Inc.
    Inventors: Vladimir A. Muratov, Yung-Chih Yen
  • Publication number: 20200313550
    Abstract: A resonant switched-capacitor converter is provided. The resonant switched-capacitor is configured to convert an input voltage on an input terminal of the resonant switched-capacitor converter into an output voltage on an output terminal of the resonant switched-capacitor converter. The resonant switched-capacitor converter includes a first resonant tank, a second resonant tank, a non-resonant capacitor, and a connection control circuit coupled to the input terminal, the output terminal, the first resonant tank, the second resonant tank and the non-resonant capacitor. The connection control circuit is configured to control connections of the first resonant tank, the second resonant tank and the non-resonant capacitor.
    Type: Application
    Filed: March 24, 2020
    Publication date: October 1, 2020
    Inventors: Alex Jianzhong Chen, Yung-Chih Yen
  • Patent number: 10277072
    Abstract: A wireless power receiver IC in which the power path can be reconfigured as either a low-dropout regulator (LDO), a switched-mode power supply (SMPS) or a power switch (PSW) is provided. All three modes share the same pass device to reduce die area and share the same output terminal to reduce pin. In an inductive wireless receiver, the power path can be reprogrammed on the fly to LDO or PSW mode or can be reprogrammed on the fly to SMPS or PSW mode. In a resonant or multi-mode wireless receiver, the power path can be reprogrammed on the fly to SMPS or PSW mode. Furthermore, to achieve high power transfer efficiency performance, using N-channel MOSFET as its pass device has better efficiency and smaller die area than P-channel MOSFET pass device.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: April 30, 2019
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventors: Yung-Chih Yen, Patrick Stanley Riehl, Hasnain Akram, Anand Satyamoorthy
  • Patent number: 10177602
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: January 8, 2019
    Assignee: Mediatek Singapore PTE, Ltd.
    Inventors: Hasnain Akram, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Patent number: 10084345
    Abstract: A resonant wireless power (RWP) system is provided that includes a signal generator that provides an input signal waveform. An amplifier structure amplifies signals for transmissions to a receiver that is powered from a fixed DC voltage supply. The amplifier structure is operated either using differential or single-ended amplifiers to provide two different output power levels, in burst mode to provide a range of output power levels, or using a capacitor in a matching network that is adjusted to provide a range of output power levels.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: September 25, 2018
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventors: Patrick Stanley Riehl, Anand Satyamoorthy, Yung-Chih Yen
  • Patent number: 9954400
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: April 24, 2018
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Hasnain Akram, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Patent number: 9559583
    Abstract: A power converter includes a wave generator, a low pass filter, a first control circuit, and a second control circuit. The wave generator receives an input voltage, and converts the input signal into a wave signal according to a first control signal and a second control signal. The low pass filter filters the wave signal to generate an output voltage. The first control circuit generates the first control signal according to the wave signal and the output voltage. The second control circuit generates the second control signal according to the wave signal and the output voltage.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: January 31, 2017
    Assignee: MEDIATEK INC.
    Inventors: Hung-chih Lin, Hung-I Wang, Hao-Ping Hong, Chien-Wei Kuan, Yung-Chih Yen
  • Publication number: 20170018936
    Abstract: A multi-mode wireless power transmitter includes a first drive circuit of a first type and a second drive circuit of a second type. The first drive circuit is configured to drive a first transmit coil at a first frequency. The second drive circuit is configured to drive a second transmit coil at a second frequency higher than the first frequency.
    Type: Application
    Filed: December 7, 2015
    Publication date: January 19, 2017
    Applicant: MediaTek Inc.
    Inventors: Vladimir A. Muratov, Yung-Chih Yen
  • Publication number: 20160299521
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Application
    Filed: January 8, 2015
    Publication date: October 13, 2016
    Inventors: HASNAIN AKRAM, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Publication number: 20160013660
    Abstract: A resonant wireless power (RWP) system is provided that includes a signal generator that provides an input signal waveform. An amplifier structure amplifies signals for transmissions to a receiver that is powered from a fixed DC voltage supply. The amplifier structure is operated either using differential or single-ended amplifiers to provide two different output power levels, in burst mode to provide a range of output power levels, or using a capacitor in a matching network that is adjusted to provide a range of output power levels.
    Type: Application
    Filed: March 14, 2014
    Publication date: January 14, 2016
    Inventors: Patrick Stanley RIEHL, Anand SATYAMOORTHY, Yung-Chih YEN
  • Publication number: 20150364928
    Abstract: A wireless power receiver IC in which the power path can be reconfigured as either a low-dropout regulator (LDO), a switched-mode power supply (SMPS) or a power switch (PSW) is provided. All three modes share the same pass device to reduce die area and share the same output terminal to reduce pin. In an inductive wireless receiver, the power path can be reprogrammed on the fly to LDO or PSW mode or can be reprogrammed on the fly to SMPS or PSW mode. In a resonant or multi-mode wireless receiver, the power path can be reprogrammed on the fly to SMPS or PSW mode. Furthermore, to achieve high power transfer efficiency performance, using N-channel MOSFET as its pass device has better efficiency and smaller die area than P-channel MOSFET pass device.
    Type: Application
    Filed: January 8, 2015
    Publication date: December 17, 2015
    Inventors: Yung-Chih Yen, Patrick Stanley Riehl, HASNAIN AKRAM, Anand Satyamoorthy
  • Publication number: 20150244200
    Abstract: A method for performing wireless charging control of an electronic device and an associated apparatus are provided, where the method includes the steps of: performing at least one frequency detection operation according to at least one signal of the electronic device to generate at least one detection result; and determining a specific set of program codes within a plurality of sets of program codes to be an active set of program codes according to the aforementioned at least one detection result, and loading the specific set of program codes from a non-volatile (NV) memory of the electronic device, to control wireless charging operations of the electronic device. For example, the aforementioned at least one signal of the electronic device can be at least one induced signal of a power input coil of the electronic device or at least one derivative of the aforementioned at least one induced signal.
    Type: Application
    Filed: November 27, 2014
    Publication date: August 27, 2015
    Inventors: Kuan-Kai Juan, Patrick Stanley Riehl, Anand Satyamoorthy, Yung-Chih Yen, Yuh-Long Yeh, Hung-Yen Chen, Jui-Ching Yang
  • Publication number: 20150200608
    Abstract: A power converter includes a wave generator, a low pass filter, a first control circuit, and a second control circuit. The wave generator receives an input voltage, and converts the input signal into a wave signal according to a first control signal and a second control signal. The low pass filter filters the wave signal to generate an output voltage. The first control circuit generates the first control signal according to the wave signal and the output voltage. The second control circuit generates the second control signal according to the wave signal and the output voltage.
    Type: Application
    Filed: January 13, 2014
    Publication date: July 16, 2015
    Applicant: Media Tek Inc.
    Inventors: Hung-chih LIN, Hung-I WANG, Hao-Ping HONG, Chien-Wei KUAN, Yung-Chih YEN
  • Patent number: 7605654
    Abstract: A telescopic operational amplifier including a current source, an input stage, and a load stage is provided. The input stage is coupled to the current source and includes a group of input transistors for receiving an input voltage. The load stage is coupled to the input stage and includes a group of load transistors for outputting an output voltage. The threshold voltages of the group of input transistors are larger than that of the group of load transistors.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: October 20, 2009
    Assignee: Mediatek Inc.
    Inventors: Yung-Chih Yen, Hung-Sung Li
  • Publication number: 20090251179
    Abstract: A clock disabling circuit includes a control unit, an OR gate, and a first AND gate. The control unit generates a first delay signal by delaying a selected enable signal when the selected enable signal is at a first level. The control unit generates a second delay signal by delaying the selected enable signal or by directly outputting the selected enable signal when the selected enable signal is at a second level. Delays of the first delay signal and the second delay signal are different. The OR gate generates an intermediate signal according to an output of the control unit and a processing signal. The first AND gate generates the processing signal according to the intermediate signal and a clock signal. A clock switching device and method and a clock disabling method are also disclosed.
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: MEDIATEK INC.
    Inventor: Yung-Chih Yen
  • Publication number: 20090231037
    Abstract: A telescopic operational amplifier including a current source, an input stage, and a load stage is provided. The input stage is coupled to the current source and includes a group of input transistors for receiving an input voltage. The load stage is coupled to the input stage and includes a group of load transistors for outputting an output voltage. The threshold voltages of the group of input transistors are larger than that of the group of load transistors.
    Type: Application
    Filed: March 13, 2008
    Publication date: September 17, 2009
    Applicant: MEDIATEK INC.
    Inventors: Yung-Chih Yen, Hung-Sung Li
  • Publication number: 20070296392
    Abstract: Bandgap reference circuits capable operating in low voltage environments. In the bandgap reference circuit, an operational amplifier comprises an output terminal and first and second input terminals, first and second transistors are coupled to the operational amplifier, and a first resistor is coupled between the output terminal of operational amplifier and the first transistor. A first resistor ladder is coupled between the output terminal of the operational amplifier and the second transistor and comprises a plurality of second resistors connected in series and a plurality of switches each having a first terminal coupled to a high-impendence path.
    Type: Application
    Filed: June 12, 2007
    Publication date: December 27, 2007
    Applicant: MEDIATEK INC.
    Inventors: Hung-I Chen, Yung-Chih Yen
  • Patent number: 7173548
    Abstract: Method and related apparatus for digital/analog converter are disclosed. The invention is based on M switch elements with each capable of selectively providing a positive or a negative electricity. While generating an analog signal output corresponding to a digital input of value D, the invention calculates two values Pa and Na according to these two equations: Pa?Na=D; Pa+Na=M, (M?1) or (M+1), and then Pa switch elements are made to respectively provide positive electricity with Na switch elements respectively providing negative electricity, such that the analog signal output is synthesized. Because the invention can perform error shaping for imbalance positive/negative electricity within each switch element, and for mismatch between the switch elements, the invention works well for over-sampling A/D converter system.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: February 6, 2007
    Assignee: VIA Technologies Inc.
    Inventor: Yung-Chih Yen
  • Publication number: 20060192703
    Abstract: Method and related apparatus for digital/analog converter are disclosed. The invention is based on M switch elements with each capable of selectively providing a positive or a negative electricity. While generating an analog signal output corresponding to a digital input of value D, the invention calculates two values Pa and Na according to these two equations: Pa?Na=D; Pa+Na=M, (M?1) or (M+1), and then Pa switch elements are made to respectively provide positive electricity with Na switch elements respectively providing negative electricity, such that the analog signal output is synthesized. Because the invention can perform error shaping for imbalance positive/negative electricity within each switch element, and for mismatch between the switch elements, the invention works well for over-sampling A/D converter system.
    Type: Application
    Filed: February 17, 2006
    Publication date: August 31, 2006
    Inventor: Yung-Chih Yen