公开(公告)号：US10250076B2

公开(公告)日：2019-04-02

申请号：US15458971

申请日：2017-03-15

Applicant: Hong Kong Applied Science and Technology Research Institute Co. Ltd.

Inventor： Jun Chen ,  Yan Liu

IPC: H02J50/12 ,  H02J7/02 ,  H03H11/30 ,  H03H7/38 ,  H03H7/40 ,  H02M7/44

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.

公开(公告)号：US10230311B2

公开(公告)日：2019-03-12

申请号：US15459003

申请日：2017-03-15

Applicant: Hong Kong Applied Science and Technology Research Institute Co. Ltd.

Inventor： Ziang Chen ,  Jun Chen ,  Hang Sang Lee

IPC: H02M7/537 ,  H02M1/32 ,  G01K7/22

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.

公开(公告)号：US09680512B2

公开(公告)日：2017-06-13

申请号：US13940238

申请日：2013-07-11

Applicant: Hong Kong Applied Science and Technology Research Institute Co. Ltd.

Inventor： Jun Chen ,  Song He

IPC: H04B7/02 ,  H04L1/02 ,  H04B1/12 ,  H04J11/00 ,  H04J13/00 ,  H04W4/00 ,  H04B7/10 ,  H04B1/7093

CPC classification number: H04B1/12 ,  H04B1/7093 ,  H04B7/10 ,  H04J11/00 ,  H04J11/0023 ,  H04J13/004 ,  H04W4/80

Abstract: A message retrieving system and method for signal collision mitigation and the method thereof are disclosed. The message retrieving system transmits two orthogonal signals over two isolated antenna during a time period that it expects to receive the response. Two virtual channels are artificially created and the collision of response signals originated from the respondents is mitigated.