Patents by Inventor Yuan-Yen Mai

Yuan-Yen Mai 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: 20250088106
    Abstract: A switching DC-to-DC converter, in which the control circuit of the switch is powered by an adaptively regulated voltage. A voltage regulator that provides the adaptively regulated voltage has a first receiving terminal coupled to an input terminal of the switching DC-to-DC converter, a second receiving terminal coupled to an output terminal of the switching DC-to-DC converter, and a regulated output terminal coupled to the control circuit to provide the adaptively regulated voltage to power the control circuit and thereby to generate a load current. According to the load current, the voltage regulator controls whether to use the output voltage to assist in the generation of the adaptively regulated voltage.
    Type: Application
    Filed: February 23, 2024
    Publication date: March 13, 2025
    Inventors: Shei-Chie YANG, Yuan-Yen MAI, Pao-Hsun YU
  • Publication number: 20240072667
    Abstract: A switching regulator includes a boost power stage circuit and a control circuit. The boost power stage circuit includes: at least one power switch configured to switch a terminal of an inductor according to an operation signal during a normal operation period, such that the terminal of the inductor is switched between an output voltage and ground level; and a power line switch connected in series to the inductor between the input voltage and the output voltage. The power line switch is turned OFF when the output voltage is short to ground level, to prevent a short current from flowing from input voltage to ground level. The control circuit generates the operation signal according to the output voltage and determines whether the power line switch is P-type or N-type MOS device, so as to turn OFF the power line switch when the output voltage is short to ground level.
    Type: Application
    Filed: July 25, 2023
    Publication date: February 29, 2024
    Inventors: Pao-Hsun Yu, Shei-Chie Yang, Yuan-Yen Mai, Cheng-Hung Hsu
  • Patent number: 11736013
    Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.
    Type: Grant
    Filed: December 30, 2021
    Date of Patent: August 22, 2023
    Assignee: Richtek Technology Corporation
    Inventors: Shei-Chie Yang, Jian-Yu Tu, Yuan-Yen Mai, Pao-Hsun Yu
  • Publication number: 20230216410
    Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit; a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between an input voltage of an input power and an output voltage of an output power and according to whether an inductor current flowing through an inductor reaches an output current of the output power; and a bypass switch circuit, wherein when the conversion voltage difference is below a reference voltage and when the inductor current flowing through the inductor reaches the output current, the bypass control signal controls the bypass switch circuit to electrically connect the input power with the output power, so that the buck-boost switching regulator operates in a bypass mode.
    Type: Application
    Filed: December 27, 2022
    Publication date: July 6, 2023
    Inventors: Shei-Chie Yang, Yuan-Yen Mai, Pao-Hsun Yu, Cheng-Hung Hsu
  • Publication number: 20220224233
    Abstract: A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.
    Type: Application
    Filed: December 30, 2021
    Publication date: July 14, 2022
    Inventors: Shei-Chie Yang, Jian-Yu Tu, Yuan-Yen Mai, Pao-Hsun Yu
  • Patent number: 9448575
    Abstract: An adjustable shunt regulator circuit has two current paths in parallel, with each current path having a bipolar transistor therein with the bases of the bipolar transistors of the two current paths connected in common. One of the current paths has a high impedance node. A MOS transistor has a gate connected to the high impedance node, and a source and a drain. A resistor divide circuit is connected in parallel to the source and drain of the MOS transistor and provides the output of the regulator circuit. The resistor divide circuit has a first resistor connected in series with a second resistor at a first node. A feedback connects the first node to the bases of the bipolar transistors connected in common of the two current paths.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: September 20, 2016
    Assignee: Microchip Technology Inc.
    Inventors: Tony Yuan Yen Mai, Isaac Terasuth Ko
  • Publication number: 20140009128
    Abstract: An adjustable shunt regulator circuit has two current paths in parallel, with each current path having a bipolar transistor therein with the bases of the bipolar transistors of the two current paths connected in common. One of the current paths has a high impedance node. A MOS transistor has a gate connected to the high impedance node, and a source and a drain. A resistor divide circuit is connected in parallel to the source and drain of the MOS transistor and provides the output of the regulator circuit. The resistor divide circuit has a first resistor connected in series with a second resistor at a first node. A feedback connects the first node to the bases of the bipolar transistors connected in common of the two current paths.
    Type: Application
    Filed: September 4, 2013
    Publication date: January 9, 2014
    Applicant: Supertex, Inc.
    Inventors: Tony Yuan Yen MAI, Isaac Terasuth Ko
  • Patent number: 8536855
    Abstract: An adjustable shunt regulator circuit has two current paths in parallel, with each current path having a bipolar transistor therein with the bases of the bipolar transistors of the two current paths connected in common. One of the current paths has a high impedance node. A MOS transistor has a gate connected to the high impedance node, and a source and a drain. A resistor divide circuit is connected in parallel to the source and drain of the MOS transistor and provides the output of the regulator circuit. The resistor divide circuit has a first resistor connected in series with a second resistor at a first node. A feedback connects the first node to the bases of the bipolar transistors connected in common of the two current paths.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: September 17, 2013
    Assignee: Supertex, Inc.
    Inventors: Tony Yuan Yen Mai, Isaac Terasuth Ko
  • Publication number: 20110285363
    Abstract: An adjustable shunt regulator circuit has two current paths in parallel, with each current path having a bipolar transistor therein with the bases of the bipolar transistors of the two current paths connected in common. One of the current paths has a high impedance node. A MOS transistor has a gate connected to the high impedance node, and a source and a drain. A resistor divide circuit is connected in parallel to the source and drain of the MOS transistor and provides the output of the regulator circuit. The resistor divide circuit has a first resistor connected in series with a second resistor at a first node. A feedback connects the first node to the bases of the bipolar transistors connected in common of the two current paths.
    Type: Application
    Filed: May 24, 2010
    Publication date: November 24, 2011
    Inventors: Tony Yuan Yen Mai, Isaac Terasuth Ko