Patents Assigned to Hong Kong Applied Science and Technology Research Institute Co., Ltd.
  • Patent number: 10250076
    Abstract: A wireless power transmitter that supplies power to a load. The wireless power transmitter includes an inverter, a voltage phase detector, a current phase detector, a phase difference counter, a controller and an impedance tuning circuit. The phase difference counter counts a phase difference between the voltage phase and the current phase at the output port of the inverter. The controller receives the phase difference from the phase difference counter and generates a control signal that changes an output impedance of the inverter in response to changes of a varying impedance of the load that is coupled with the output port of the inverter wirelessly. The impedance tuning circuit receives the control signal from the controller and tunes an imaginary part of the output impedance of the inverter to zero in order to maximize a power transfer efficiency from the wireless power transmitter to the load.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: April 2, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Jun Chen, Yan Liu
  • Patent number: 10244495
    Abstract: Methods and systems which provide for synchronization target selection by configuring a network device to reselect a synchronization signal transmission timeslot for synchronization target searching by the network device are described. Synchronization signal timeslot reselection may provide for downgrading a current stratum index to an artificial stratum index that does not accurately indicate a number of hops between the network device and a global synchronization source to allow for selection of available synchronization targets with stratum indices that are higher than or equal to the network device's stratum index without causing a synchronization loop. A synchronization signal pattern cycle structure having synchronization signal timeslots organized into multiple subcycles for accommodating synchronization signal timeslot reselection is utilized according to embodiments.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: March 26, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Wilson Wang Kit Thong, Victor Man Wai Kwan, Elaine Jihui Zhang, Jie Chuai, Ching Hong Leung, Yan Lam Lee, Eric Kong Chau Tsang
  • Patent number: 10230311
    Abstract: A method prevents shoot-through currents and reduces body-diode conduction time in an inverter circuit by changing dead times for transistors in the inverter circuit. A sensing resistor senses temperatures of transistors in the inverter circuit. A delay generator changes delay times in response to receiving the temperatures of the transistors from the sensing resistor. A dead time generation unit changes the dead times for the transistors in response to changes in the delay times.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: March 12, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Ziang Chen, Jun Chen, Hang Sang Lee
  • Patent number: 10219106
    Abstract: The present disclosure relates to methods and systems for generation of a beacon identifier (ID) for increased security of a system for a location based service. The system includes a beacon device, such as a BLE device, a mobile device, and a server. The beacon device is configured to generate a beacon ID based on a beacon device identifier, such as a unique device identifier, of a beacon device and a time value. In some implementations, generation of the beacon ID includes a pseudorandom function and a shared key that is established between the beacon device and the server.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: February 26, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Andy Lam, Fred Wong, Aldar Chan
  • Patent number: 10210616
    Abstract: Methods are described for detecting an edge of an object within an image with a fractional differential operator. Methods are also described for calculating 3D information using a strip pattern and the disclosed edge detection method. The fractional differential operator may be a modified Riesz space fractional differential operator. When calculating the fractional derivative of the image, a kernel approximation, in which a scaled Gaussian kernel function or a simplified scaled Gaussian kernel function, is applied to discretize the modified Riesz space fractional differential operator locally. The disclosed method improves the accuracy of edge detection, eliminates the need of applying additional fractional integration for noise suppression, and requires a smaller mask length to achieve desired accuracy.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: February 19, 2019
    Assignee: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO., LTD.
    Inventor: Ka Chun Cheung
  • Patent number: 10212677
    Abstract: The present disclosure relates to methods and systems for selection of synchronization targets. Embodiments of the present disclosure provide for selecting a synchronization target for a network device, within operational network constraints, when the network device loses its current synchronization target. When a network device loses its current synchronization target, the stratum index of the network device is downgraded to an artificial stratum index before a selection of a new synchronization target is made. The artificial stratum index is broadcast to children network devices. Downgrading the stratum index to an artificial stratum index allows for selection of available synchronization target network devices with stratum indices higher than or equal to the network device's stratum index. After selection of a new synchronization target, the network device's stratum index is updated, and the new updated stratum index of the network device is broadcast to the children network devices of the network device.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: February 19, 2019
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Wilson Wang Kit Thong, Elaine Jihui Zhang, Victor Man Wai Kwan, Vincent Zizhou Wang, Eric Kong Chau Tsang, Wei Han
  • Publication number: 20180315198
    Abstract: Methods are described for detecting an edge of an object within an image with a fractional differential operator. Methods are also described for calculating 3D information using a strip pattern and the disclosed edge detection method. The fractional differential operator may be a modified Riesz space fractional differential operator. When calculating the fractional derivative of the image, a kernel approximation, in which a scaled Gaussian kernel function or a simplified scaled Gaussian kernel function, is applied to discretize the modified Riesz space fractional differential operator locally. The disclosed method improves the accuracy of edge detection, eliminates the need of applying additional fractional integration for noise suppression, and requires a smaller mask length to achieve desired accuracy.
    Type: Application
    Filed: April 27, 2017
    Publication date: November 1, 2018
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventor: Ka Chun CHEUNG
  • Patent number: 10105089
    Abstract: Techniques for effectively and accurately measuring psychological influencing factors, such as the white coat effect and mental stress, that may affect or otherwise influence biometric measurements, such as blood pressure measurements, are described. Embodiments of a measurement validation system herein may utilize a method for determining an artery location on a living subject's skin and positioning a tonometry pressure sensor on the artery location for tonometric blood pressure measurement to obtain pressure pulse data for a subject. In operation according to embodiments, measurement logic of a measurement validation system may utilize the pressure pulse data to extract blood pressure data, heart rate data, blood pressure variability data, and heart rate variability data. The foregoing data may be utilized in identifying whether the blood pressure measurement properly and accurately reflects the situation of the subject.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: October 23, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Lap Wai Lydia Leung, Wenbo Gu
  • Patent number: 10058255
    Abstract: A method of determining stiffness index of an arterial network is disclosed. The method comprises the steps of: obtaining a pulse waveform related to the arterial network; estimating a source pulse based on at least one predetermined feature of the pulse waveform; determining a plurality of characteristics of the pulse waveform based on a relationship between the pulse waveform and the source pulse; and calculating the stiffness index of the arterial network based on the plurality of characteristics of the pulse waveform. An arterial stiffness index measuring device employing the above methodology is also disclosed therein.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: August 28, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventor: Chi Kit Cheng
  • Patent number: 10045237
    Abstract: Systems and methods which provide white space channel identification and/or selection using high probability area determinations for a device and availability probability calculations for channels based on a probability model are described. A white space device (WSD) may utilize spectrum scanner sensing results to determine one or more course high probability area (HPA) for the WSD. The sensing results may further be analyzed to derive probability information regarding the WSD being located at the HPAs, to thereby refine the HPAs. Thereafter, the information regarding probabilities of the WSD being located at the HPAs may be utilized with information from a white space location database to determine an availability probability of one or more white space channels. One or more such white space channels may be identified and/or selected for use by the WSD.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: August 7, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Xiang Chen, Eddy Chiu, Man Wai Kwan, Kong Chau Tsang
  • Patent number: 10039057
    Abstract: The present disclosure is related to a system for managing data exchanges between Bluetooth Low Energy (BLE) devices. The system includes a plurality of BLE devices. At least one BLE device is configured as a parent node and at least one BLE device is configured as a child node. The parent node is configured to receive a BLE packet, including data reported by the child node in a payload field of the BLE packet, and to use a location function to determine a location in the payload field for inserting data to be reported from the parent node. The parent node aggregates the data to be reported from the parent node and the data reported by the child node by inserting the data from the parent node into the determined location in the payload field of the BLE packet, and then broadcasts the BLE packet with the aggregated data.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: July 31, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Tak Wing Lam, Tak Fuk Wong
  • Patent number: 10014280
    Abstract: A power electronic package includes a first substrate, a second substrate oppositely disposed from the first substrate, one or more chips disposed between the substrates, and at least three spacers. The spacers control a height variation of the power electronic package and protect the chips and other electronics from experiencing excessive stress. The height of the spacers is determined based on a height of the chips, on a height of solder blocks that connect the chips to the top substrate, and on a height of solder blocks that connect the chips to the bottom substrate.
    Type: Grant
    Filed: June 11, 2017
    Date of Patent: July 3, 2018
    Assignee: HONG KONG APPLIED SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE CO. LTD.
    Inventors: Ziyang Gao, Xunqing Shi, Shi Wo Chow
  • Patent number: 9924894
    Abstract: The present invention discloses a non-invasive method of measuring skin thickness and blood glucose concentration of a subject by a Raman system. The advantage of the present invention is that a single Raman spectrum is used to measure both the skin thickness and glucose concentration. The skin thickness and Raman intensity retrieved from the same Raman spectrum are both utilized to yield a more accurate blood glucose concentration. The present invention also discloses a Raman system for measuring physiological data of a subject. It comprises a Raman spectroscopic unit and a signal processing unit.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: March 27, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Chun Zhang, Tsz Ho Lau, Yuk Cheung Chan, Wei Mong Tsang
  • Patent number: 9912512
    Abstract: Systems and methods which provide training sequence or preamble-based synchronization with respect to non-coherent modulated signals and/or differentially coherent modulated signals are described. Embodiments provide for time synchronization using a technique for mitigating the effect of carrier frequency offset (CFO) with respect to the received signal. Embodiments of the present invention provide for frequency synchronization using a technique for estimating CFO using a constant bias induced with respect to the received signal by CFO. Additionally or alternatively, embodiments of the present invention provide for frequency synchronization using a technique for estimating CFO using phase rotation caused by CFO. The time synchronization and frequency synchronization of embodiments may be performed independently, without requiring the results of one synchronization operation for performing the other synchronization operation.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: March 6, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Shaohua Zhao, Wuxue Ni, Biqiang Luo, Li Li
  • Patent number: 9910241
    Abstract: The subject matter disclosed herein relates to an imaging module comprising an electromagnetic actuator to provide focus-related and image stabilization-related functionality.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: March 6, 2018
    Assignee: Hong Kong Applied Science & Technology Research Institute Co., Ltd.
    Inventors: Kowk Sing Cheng, Kin Ming Fan, Chuen Kuen Yeung
  • Patent number: 9912511
    Abstract: Systems and methods which provide training sequence or preamble-based synchronization with respect to non-coherent modulated signals and/or differentially coherent modulated signals are described. Embodiments provide for time synchronization using a technique for mitigating the effect of carrier frequency offset (CFO) with respect to the received signal. Embodiments of the present invention provide for frequency synchronization using a technique for estimating CFO using a constant bias induced with respect to the received signal by CFO. Additionally or alternatively, embodiments of the present invention provide for frequency synchronization using a technique for estimating CFO using phase rotation caused by CFO. The time synchronization and frequency synchronization of embodiments may be performed independently, without requiring the results of one synchronization operation for performing the other synchronization operation.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: March 6, 2018
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Shaohua Zhao, Wuxue Ni, Li Li
  • Patent number: 9713284
    Abstract: The present invention discloses a fluid cooling assembly which facilitates turbulent flow inside the assembly so as to achieve better heat dissipating effect. The cooling assembly comprises an enclosed chamber with an inlet and an outlet for fluid to pass through; together with a heat spreader; a plurality of micropillars and a plurality of heat dissipating fins installed inside the assembly. When fluid flows through the chamber, these elements in combination are adapted to create an enhanced turbulent flow upon the fluid so as to effectively dissipate heat from said heat spreader through the fluid.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: July 18, 2017
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Ziyang Gao, Ya Lv, Yat Kit Tsui
  • Patent number: 9703068
    Abstract: The subject matter disclosed herein relates to an imaging module comprising an electromagnetic actuator to provide focus-related and image stabilization-related functionality.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: July 11, 2017
    Assignee: Hong Kong Applied Science and Technology Research Institute, Co., Ltd.
    Inventors: Kwok Sing Cheng, Kin Ming Fan
  • Patent number: 9704819
    Abstract: A power electronic package includes a first substrate, a second substrate oppositely disposed from the first substrate, one or more chips disposed between the substrates, and at least three spacers. The spacers control a height variation of the power electronic package and protect the chips and other electronics from experiencing excessive stress. The height of the spacers is determined based on a height of the chips, on a height of solder blocks that connect the chips to the top substrate, and on a height of solder blocks that connect the chips to the bottom substrate.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: July 11, 2017
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Ziyang Gao, Ya Lv
  • Patent number: 9698836
    Abstract: Systems and methods which provide mitigation of self-interference in spectrally efficient full duplex (e.g., transmit and receive using the same frequency simultaneously) communications are described. Embodiments provide an interference mitigation structure having a multi-tap vector modulator interference cancellation circuit operable to cancel time varying multipath interference in the analog RF domain. A multi-tap vector modulator interference cancellation circuit of embodiments may comprise part of a multi-stage interference cancellation circuit, such as a multi-stage interference cancellation circuit comprising a multi-tap vector modulator interference cancellation circuit and a digital residual interference cancellation circuit. A digital residual interference cancellation circuit of embodiments provides residual interference cancellation.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: July 4, 2017
    Assignee: Hong Kong Applied Science and Technology Research Institute Co. Ltd.
    Inventors: Wen Qin, Yuanyuan Du, Jiewei Ding, Man Wai Kwan, Angus Chi Keung Mak, Kong Chau Tsang