Patents by Inventor Yanmei Guo
Yanmei Guo 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: 20240154537Abstract: A control circuit for an isolated power supply is disclosed, the control circuit includes a secondary-side drive signal generator, a secondary-side transistor switch turn-off detector and a primary-side control signal generator. The primary-side control signal generator is configured to: determine a second turn-on instant referring to an turn-off instant of the secondary-side synchronous rectification transistor from the turn-off acknowledgement signal; determine a first turn-on instant referring to a supposed turn-on instant for the primary-side transistor switch from the feedback signal of the output voltage of the isolated power supply; and determine the turn-on instant for the primary-side transistor switch from the second turn-on instant or the first turn-on instant whichever is later, and responsively generate the primary-side transistor switch control signal.Type: ApplicationFiled: January 12, 2024Publication date: May 9, 2024Inventors: Yanmei GUO, Zhen ZHU, Yihui CHEN, Yuehui LI, Xiaoru GAO, Haifeng MIAO, Hanfei YANG
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Patent number: 11929684Abstract: Isolated power supply control circuits, isolated power supply and control method thereof are disclosed, the control circuit for controlling an isolated power supply includes a secondary-side control signal generator and a primary-side control signal generator. The secondary-side control signal generator produces a secondary-side transistor switch control signal containing information about a turn-off instant of a secondary-side synchronous rectification transistor, which serves as a second turn-on instant. The primary-side control signal generator derives, from a feedback signal, a supposed turn-on instant for a primary-side transistor switch, which serves as a first turn-on instant. The primary side turn-on signal generator further derives a turn-on instant for the primary-side transistor switch from the second or first turn-on instant whichever is later and responsively generates a primary-side transistor switch control signal.Type: GrantFiled: December 14, 2021Date of Patent: March 12, 2024Assignee: SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD.Inventors: Yanmei Guo, Zhen Zhu, Yihui Chen, Yuehui Li, Xiaoru Gao, Haifeng Miao, Hanfei Yang
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Publication number: 20230412082Abstract: A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against load changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.Type: ApplicationFiled: August 31, 2023Publication date: December 21, 2023Inventors: Yanmei GUO, Yihui CHEN, Haifeng MIAO, Yuehui LI, Xiaoru GAO, Zhen ZHU
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Patent number: 11799379Abstract: A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against loading changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.Type: GrantFiled: December 17, 2021Date of Patent: October 24, 2023Assignee: SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD.Inventors: Yanmei Guo, Yihui Chen, Haifeng Miao, Yuehui Li, Xiaoru Gao, Zhen Zhu
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Publication number: 20230063861Abstract: A control circuit, a control chip and a power supply device are disclosed by the present invention. The control circuits are used for control of a constant-voltage closed-loop which causes a voltage of a voltage feedback signal obtained from an output voltage to approach a voltage of a reference voltage signal obtained from a base voltage and thereby achieves a constant-voltage output. In addition, when a sampled current obtained from an output current is higher than a predetermined current, or when output power is higher than a predetermined power, the control circuit increases the voltage feedback signal or decreases the reference voltage signal, causing the constant-voltage closed loop to decrease the output voltage and the output current and thereby achieving a limited output current and limited output power.Type: ApplicationFiled: August 22, 2022Publication date: March 2, 2023Inventors: Yanmei GUO, Zhen ZHU, Yuehui LI, Yihui CHEN, Xiaoru GAO, Haifeng MIAO, Rulong JIANG
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Publication number: 20230050386Abstract: An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present application. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive a first signal and a third signal that are external to the capacitor charging/discharging module and to output a feedback signal. The error amplification module is configured to receive the feedback signal and a second signal that is external to error amplification module and to output, based on the received feedback and second signals, a target signal to the capacitor charging/discharging module. In a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.Type: ApplicationFiled: August 11, 2022Publication date: February 16, 2023Inventors: Yanmei GUO, Zhen ZHU, Yuehui LI, Xiaoru GAO, Yihui CHEN, Haifeng MIAO, Rulong JIANG
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Publication number: 20230046618Abstract: An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present invention. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive first, second and third signals external to the capacitor charging/discharging module, and to output a reference signal and a feedback signal. The error amplification module is configured to receive the reference and feedback signals and output a target signal to the capacitor charging/discharging module based on the received reference and feedback signals. The first, second and third signals are all analog signals, and in a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.Type: ApplicationFiled: August 11, 2022Publication date: February 16, 2023Inventors: Yanmei GUO, Zhen ZHU, Yuehui LI, Xiaoru GAO, Yihui CHEN, Haifeng MIAO, Rulong JIANG
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Publication number: 20230049884Abstract: An output short-circuit protection method, a power management chip and a switched-mode power supply are disclosed. When current accumulation has occurred in a power transistor, the number of consecutive current pulses during which the current accumulation occurred is counted. Upon the number of consecutive current pulses reaches a preset value, a regulation interval spanning switching periods is triggered, for at least some of the switching periods, the leading-edge blanking time is shortened or cancelled. In this way, an excessively large current flowing through the power transistor is prevented. Compared with existing fault response measures for power management chips, restart of the power supply and adjustment of the system timing are not needed, allowing easier implementation. Further, the automatic restart during chip start up due to false triggering as found in the existing measures for power management chips is circumvented.Type: ApplicationFiled: August 10, 2022Publication date: February 16, 2023Inventors: Yanmei GUO, Zhen ZHU, Yuehui LI, Xiaoru GAO, Yihui CHEN, Haifeng MIAO, Rulong JIANG
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Publication number: 20220209673Abstract: A control circuit, system and method for switched-mode power supply are disclosed, the control circuit is for driving a first switch to convert an input voltage into an output voltage. The control circuit includes an on-time control unit, which receives a first signal characterizing switching frequency of first switch and a second signal characterizing current flowing through first switch and responsively generates a signal indicative of a turn-off instant for first switch. When a peak value of the current flowing through the first switch drops below a predefined value, the on-time control unit determines the turn-off instant for the first switch based on the first signal so that the switching frequency of the first switch is maintained at a target frequency. This design can effectively avoid the generation of audible noise, stabilize the output voltage against loading changes while maintaining desirable efficiency, and ensure operational safety of the switched-mode power supply.Type: ApplicationFiled: December 17, 2021Publication date: June 30, 2022Inventors: Yanmei GUO, Yihui CHEN, Haifeng MIAO, Yuehui LI, Xiaoru GAO, Zhen ZHU
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Publication number: 20220200466Abstract: Isolated power supply control circuits, isolated power supply and control method thereof are disclosed, the control circuit for controlling an isolated power supply includes a secondary-side control signal generator and a primary-side control signal generator. The secondary-side control signal generator produces a secondary-side transistor switch control signal containing information about a turn-off instant of a secondary-side synchronous rectification transistor, which serves as a second turn-on instant. The primary-side control signal generator derives, from a feedback signal, a supposed turn-on instant for a primary-side transistor switch, which serves as a first turn-on instant. The primary side turn-on signal generator further derives a turn-on instant for the primary-side transistor switch from the second or first turn-on instant whichever is later and responsively generates a primary-side transistor switch control signal.Type: ApplicationFiled: December 14, 2021Publication date: June 23, 2022Inventors: Yanmei GUO, Zhen ZHU, Yihui CHEN, Yuehui LI, Xiaoru GAO, Haifeng MIAO, Hanfei YANG
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Patent number: 9152268Abstract: A device and method are provided for increasing touch screen response.Type: GrantFiled: December 7, 2010Date of Patent: October 6, 2015Assignee: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.Inventors: Qiang Li, Qinglin Tao, Yanmei Guo, Liming Liang, Jieying Lin
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Patent number: 8983607Abstract: Methods and apparatus for protecting a function mode of a medical device are described. A method may include the steps of: when an operator selects to use a function mode that needs protection in the medical device, presenting the operator information on a specified operation for entering the selected function mode; receiving an operation of the operator; determining whether the received operation of the operator is identical to the specified operation; and starting the selected function mode, if the determining result is confirmative.Type: GrantFiled: January 18, 2011Date of Patent: March 17, 2015Assignee: Shenzhen Mindray Bio-Medical Electronics Co., LtdInventors: Yanmei Guo, Saixin Zhou, Min An, Dazhi Teng
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Publication number: 20110237944Abstract: A method for transferring configuration settings and/or user maintenance items includes allowing a user to select a set of configuration settings and/or user maintenance items stored in a removable memory device coupled to a medical device; displaying the selected set of configuration settings and/or user maintenance items on a display device; and importing configuration settings and/or user maintenance items stored in the removable memory device to the medical device.Type: ApplicationFiled: March 14, 2011Publication date: September 29, 2011Applicant: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.Inventors: Guoqi SHI, Qiang LI, Yanmei GUO, Qinglin TAO, Jieying LIN
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Publication number: 20110157042Abstract: A device and method are provided for increasing touch screen response.Type: ApplicationFiled: December 7, 2010Publication date: June 30, 2011Applicant: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.Inventors: Qiang Li, Qinglin Tao, Yanmei Guo, Liming Liang, Jieying Lin
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Publication number: 20110118799Abstract: Methods and apparatus for protecting a function mode of a medical device are described. A method may include the steps of: when an operator selects to use a function mode that needs protection in the medical device, presenting the operator information on a specified operation for entering the selected function mode; receiving an operation of the operator; determining whether the received operation of the operator is identical to the specified operation; and starting the selected function mode, if the determining result is confirmative.Type: ApplicationFiled: January 18, 2011Publication date: May 19, 2011Applicant: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.Inventors: Yanmei Guo, Saixin Zhou, Min An, Dazhi Teng
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Patent number: 7873416Abstract: Methods and apparatus for protecting a function mode of a medical device are described. A method can include steps of: when an operator selects to use a function mode that needs protection in the medical device, presenting the operator information on a specified operation for entering the selected function mode; receiving an operation of the operator; determining whether the received operation of the operator is identical to the specified operation; and starting the selected function mode, if the determining result is confirmative.Type: GrantFiled: November 20, 2007Date of Patent: January 18, 2011Assignee: Shenzhen Mindray Bio-Medical Electronics Co., Ltd.Inventors: Yanmei Guo, Saixin Zhou, Min An, Dazhi Teng
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Publication number: 20080154325Abstract: The invention relates to a method and apparatus for protecting a function mode of a medical device, the method comprising steps of: when an operator selects to use a function mode that needs protection in the medical device, presenting the operator information on a specified operation for entering the selected function mode; receiving an operation of the operator; determining whether the received operation of the operator is identical to the specified operation; and starting the selected function mode, if the determining result is confirmative. The invention not only efficiently protects the function modes of the medical device and makes it not to be operated arbitrarily, but also facilitates the use of the operator.Type: ApplicationFiled: November 20, 2007Publication date: June 26, 2008Applicant: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTDInventors: Yanmei Guo, Saixin Zhou, Min An, Dazhi Teng