公开(公告)号：US11984859B2

公开(公告)日：2024-05-14

申请号：US17428637

申请日：2019-03-25

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhiming Liang ,  Bin Li ,  Zhaohui Wu

IPC: H03F1/02 ,  H03F3/387 ,  H03F3/45

CPC classification number: H03F3/387 ,  H03F3/45475

Abstract: A chopper amplifying circuit employing a negative impedance compensation technique, including a differential input end, a first-level chopper switch, a first-level amplifying circuit, a second-level chopper switch, a second-level amplifying circuit, a negative impedance converting circuit, a negative feedback unit, an input capacitor, and a differential output end, is provided. The differential input end is connected to the first-level chopper switch. An output terminal of the first-level chopper switch is connected to the first-level amplifying circuit through the input capacitor. The first-level amplifying circuit is connected to the second-level chopper switch, which is connected to the second-level amplifying circuit. The second-level amplifying circuit is connected to the differential output end, and is also connected to a feedback input end of the first-level amplifying circuit through the negative feedback unit. The negative impedance converting circuit is parallel-connected to a signal input end of the first-level amplifying circuit.

公开(公告)号：US11641208B2

公开(公告)日：2023-05-02

申请号：US17742336

申请日：2022-05-11

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhijian Chen ,  Ziying Wu ,  Changjian Zhou ,  Pengfei Yu ,  Bin Li ,  Shaolin Zhou

IPC: H03L7/099 ,  H03L7/081 ,  H03L7/085

Abstract: A frequency locking method for a phase-locked loop comprises the following steps: S1, a frequency control module controls a numerically controlled oscillator to obtain an maximum output frequency and a minimum output frequency; S2, obtain a minimum frequency ratio and a maximum frequency ratio by means of a time-to-digital converter and the frequency control module; S3, calculate a first frequency control word and a first frequency ratio according to the minimum frequency ratio and the maximum frequency ratio; S4, the frequency control module uses the Newton's iterative method to recalculate a new frequency control word; S5, obtain a new frequency ratio according to the new frequency control word; S6, if the new frequency ratio is within an error range, end iteration and stably output the new frequency control word, and otherwise, jump to step S4.

公开(公告)号：US11824443B2

公开(公告)日：2023-11-21

申请号：US17604765

申请日：2019-08-19

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Yuyang Liu ,  Bin Li ,  Yanqi Zheng ,  Zhaohui Wu

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/14 ,  H02M3/155

CPC classification number: H02M3/158 ,  H02M1/009 ,  H02M1/14 ,  H02M3/155

Abstract: This disclosure discloses a single-inductor multiple-output DC-DC buck converter, which includes a power conversion unit and i charge controllers, as well as a phase-locked loop, a logic unit, a driving unit, and an input trunk duty ratio generation unit. The charge controllers are connected to the driving unit through the logic unit. The logic unit is further connected to the phase-locked loop and the phase-locked loop is connected to the driving unit through the input trunk duty ratio generation unit. The driving unit is connected to the power conversion unit. The disclosure applies charge control to every output branch path, and adopts a phase-locked loop as the cycle control, which effectively suppresses the cross modulation effect of every branch path, and does not require the last branch path to have a sufficiently heavy load, which broadens the load range, while taking into account other performance requirements concurrently.

公开(公告)号：US10217561B2

公开(公告)日：2019-02-26

申请号：US15529517

申请日：2015-12-19

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Xiuyin Zhang ,  Chengdai Xue ,  Bin Li

IPC: H01F27/34 ,  H01F27/28 ,  H02J50/10 ,  H02J50/70 ,  H01F38/14 ,  H04B5/00 ,  H02J50/12

Abstract: A wireless power transfer coil system using offset of electric and magnetic coupling for frequency splitting suppression, which includes one transmitting coil, one receiving coil and four loaded annular metal sheets, is provided. A first annular metal sheet and a second annular metal sheets of the four loaded annular metal sheets are loaded between the transmitting coil and a third and a fourth annular metal sheets of the four loaded annular metal sheets are loaded between the receiving coil to expand a variable distance range of a power transmission. The coil system enables the coils to worked in a state of magnetic and electric coupling. During a process of moving from a long distance to a short distance, a coupling coefficient between the coils changes gradually, but a low coupling degree is still maintained so that a phenomenon of frequency splitting is not produced, thereby maintaining a high-efficiency power transmission within the system.