公开(公告)号：US20180262186A1

公开(公告)日：2018-09-13

申请号：US15779432

申请日：2017-01-23

Applicant: SOUTHEAST UNIVERSITY ,  SOUTHEAST UNIVERSITY-WUXI INTEGRATED CIRCUIT TECHNOLOGY RESEARCH INSTITUTE

Inventor： Weifeng SUN ,  Yunwu ZHANG ,  Kuo YU ,  Jing ZHU ,  Shen XU ,  Qinsong QIAN ,  Siyang LIU ,  Shengli LU ,  Longxing SHI

IPC: H03K17/06 ,  H03K17/687 ,  H03K17/16

CPC classification number: H03K17/063 ,  H01L27/0727 ,  H01L29/1083 ,  H01L29/42368 ,  H01L29/7835 ,  H03K17/162 ,  H03K17/6871 ,  H03K19/0185 ,  H03K2217/0063 ,  H03K2217/0081

Abstract: Parasitic high-voltage diodes implemented by integration technology in a high-voltage level shift circuit are used for charging a bootstrap capacitor CB, wherein a power supply end of the high voltage level shift circuit is a high-side floating power supply VB, and a reference ground is a floating voltage PGD that is controlled by a bootstrap control circuit. A first parasitic diode DB1 and a second parasitic diode DB2 are provided between the VB and the PGD. The bootstrap control circuit is controlled by a high-side signal and a low-side signal.

公开(公告)号：US20220085727A1

公开(公告)日：2022-03-17

申请号：US17418606

申请日：2019-12-19

Applicant: SOUTHEAST UNIVERSITY ,  CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Weifeng SUN ,  Huaxin ZHANG ,  Hu ZHANG ,  Menglin YU ,  Siyu ZHAO ,  Shen XU ,  Longxing SHI

IPC: H02M3/335

Abstract: A flyback converter and an output voltage acquisition method therefor and apparatus thereof, wherein the output voltage acquisition method comprises the following steps: acquiring the reference output voltage of a flyback converter; sampling the current output voltage of the flyback converter within a reset time of each switching period among M continuous switching periods of the flyback converter, wherein M is a positive integer; and according to the reference output voltage and the current output voltage, sampling a dichotomy to successively approximate the current output voltage until the M switching periods are finished, and acquiring the output voltage of the flyback converter.

公开(公告)号：US20220069718A1

公开(公告)日：2022-03-03

申请号：US17420866

申请日：2020-06-19

Applicant: SOUTHEAST UNIVERSITY ,  CSMC TECHNOLOGIES FAB2 CO., LTD.

Inventor： Shen XU ,  Minggang CHEN ,  Wanqing YANG ,  Dejin WANG ,  Rui JIANG ,  Weifeng SUN ,  Longxing SHI

IPC: H02M3/335 ,  H02M1/38

Abstract: Disclosed are a system and method for controlling an active clamp flyback (ACF) converter. The system includes: a drive module configured to control turning-on or turning-off of a main switching transistor SL and a clamp switching transistor SH; a main switching transistor voltage sampling circuit configured to sample a voltage drop between an input terminal and an output terminal of the main switching transistor SL; a first comparator connected to the main switching transistor voltage sampling circuit and configured to determine whether a sampled first sampling voltage is a positive voltage or a negative voltage; and a dead time calculation module configured to adjust, according to an output of the first comparator and a main switching transistor control signal DUTYL of a current cycle, a clamp switching transistor control signal DUTYH of next cycle outputted by the drive module.

公开(公告)号：US20240280613A1

公开(公告)日：2024-08-22

申请号：US18567039

申请日：2022-08-03

Applicant: SOUTHEAST UNIVERSITY

Inventor： Shen XU ,  Chenxi YANG ,  Yijie QIAN ,  Yujie LIU ,  Limin YU ,  Weifeng SUN ,  Longxing SHI

IPC: G01R19/25 ,  G01R15/04 ,  G01R19/00 ,  H02M1/00 ,  H02M3/157 ,  H02M3/158

CPC classification number: G01R19/25 ,  G01R15/04 ,  G01R19/0038 ,  H02M1/0009 ,  H02M3/157 ,  H02M3/158

Abstract: An inductor current estimation method for a DC-DC switching power supply using a voltage sampling module, a data conversion module, a switching signal counting module, an inductor voltage calculation module and a digital filter module, comprising: processing an input voltage and an output voltage by the voltage sampling module and the data conversion module to obtain a converted input voltage and a converted output voltage which have a same number of bits; comparing a node voltage with a reference voltage, and then obtaining a duty cycle by the switching signal counting module; and then, outputting an average voltage of two terminals of an inductor and a parasitic resistor by the inductor voltage calculation module, and finally, obtaining an estimated inductor current by the digital filter module.

公开(公告)号：US20240266943A1

公开(公告)日：2024-08-08

申请号：US18641384

申请日：2024-04-21

Applicant: SOUTHEAST UNIVERSITY

Inventor： Shen XU ,  Haiqing ZHANG ,  Yujie LIU ,  Ruizhi WANG ,  Yuan GAO ,  Yongjia LI ,  Weifeng SUN ,  Longxing SHI

IPC: H02M1/08 ,  H02M1/00 ,  H02M3/158

CPC classification number: H02M1/082 ,  H02M1/0025 ,  H02M3/1586

Abstract: A multi-phase high-precision current sharing control method applied to constant on-time control is provided, wherein a current difference between continuously sampled current of each line and mean current is processed by a PI compensation module and a low-pass filter module to obtain on-time regulation data. A high bit of the regulation data controls the value of counter reference Vref in an on-time control module, and a low bit controls the length of an enabled delay line in a delay line module. The counter timing control of the on-time control module is combined with the delay line timing control of the delay line module to improve the control precision of a DPWM. The method takes COT control of a Buck converter as a typical application. Compared with a multi-phase COT controller without a current-sharing mechanism, the method can improve the stability and reliability of the system.

公开(公告)号：US20180234007A1

公开(公告)日：2018-08-16

申请号：US15751136

申请日：2016-01-29

Applicant: SOUTHEAST UNIVERSITY

Inventor： Shen XU ,  Chong WANG ,  Xianjun FAN ,  Weifeng SUN ,  Shengli LU ,  Longxing SHI

IPC: H02M1/08 ,  G05B19/042

CPC classification number: H02M1/08 ,  G05B19/042 ,  G05B2219/2639 ,  H02M3/335 ,  H02M2001/0048

Abstract: A control method for improving dynamic response of switch power is based on a closed-loop control system comprising a sampling module, a dynamic control module, an error calculation module, a PID module, a mode control module, and a PWM module. The sampling module samples an output voltage Vo, and the dynamic control module compares the output voltage Vo with a set maximum voltage Vomax, a set minimum voltage Vomin, and a reference voltage Vref, so as to determine whether to adopt a dynamic mode. In the dynamic mode, when the output voltage Vo changes greatly, the output voltage Vo is rapidly restored to a stable voltage by inputting large power or small power.

公开(公告)号：US20200343810A1

公开(公告)日：2020-10-29

申请号：US16959015

申请日：2018-12-29

Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD. ,  SOUTHEAST UNIVERSITY

Inventor： Shen XU ,  Minggang CHEN ,  Hao WANG ,  Jinyu XIAO ,  Wei SU ,  Weifeng SUN ,  Longxing SHI

IPC: H02M1/38 ,  H02M3/335 ,  H02M1/08

Abstract: An automatic dead zone time optimization system in a primary-side regulation flyback power supply CCM mode, comprising a closed loop formed by a control system, consisting of a single output DAC midpoint sampling module, a digital control module, a current detection module, a dead zone time calculation module and a PWM driving module, and a controlled synchronous rectification primary-side regulation flyback converter. By means of a DAC Sampling mechanism, a primary-side current is sampled to calculate a secondary-side average current, so as to obtain a primary-side average current Imid_p and a secondary-side average current Is(tmid) in the case of CCM; a secondary-side current is input into the dead zone time calculation module to obtain a reasonable dead zone time td; and finally, the PWM driving module is jointly controlled by a primary-side regulation loop and the obtained dead zone time td.

公开(公告)号：US20200336070A1

公开(公告)日：2020-10-22

申请号：US16959001

申请日：2018-12-29

Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD. ,  SOUTHEAST UNIVERSITY

Inventor： Weifeng SUN ,  Rongrong TAO ,  Hao WANG ,  Jinyu XIAO ,  Wei SU ,  Shen XU ,  Longxing SHI

IPC: H02M3/335 ,  H03K5/24

Abstract: A method for improving the conversion efficiency of a CCM mode of a flyback resonant switch power supply, comprising: presetting a threshold value Tset, calculating a time interval Ttap between adjacent zero points during a present conducting time, outputting a switch-off signal at zero points, and comparing the time interval Ttap with the preset threshold value Tset; when Ttap>Tset, he present switch-off time to be less than a switch-off time of a previous cycle, outputting a switch-on signal; when Ttap=0, controlling the present switch-off time to be greater than a switch-off time of the previous cycle, outputting a switch-on signal; and when 0

公开(公告)号：US20200328689A1

公开(公告)日：2020-10-15

申请号：US16915524

申请日：2020-06-29

Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD. ,  SOUTHEAST UNIVERSITY

Inventor： Shen XU ,  Wei WANG ,  Feng LIN ,  Boyong HE ,  Wei SU ,  Weifeng SUN ,  Longxing SHI

IPC: H02M3/335 ,  G01R19/165 ,  H03K5/24

Abstract: Provided is a dynamic control method that turns off a primary-side switching transistor when an output voltage exceeds an upper limit, and control the switching of a secondary-side synchronous rectification transistor with a fixed cycle and a fixed duty cycle. During the time that the synchronous rectification transistor is turned on, the energy of a load capacitor at the output end is extracted to the primary side, which causes the output voltage to drop rapidly and the overshoot voltage to decrease greatly.