公开(公告)号：US20200343845A1

公开(公告)日：2020-10-29

申请号：US16958868

申请日：2018-12-29

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

Inventor： Rui ZHONG ,  Mingshu ZHANG ,  Sen ZHANG ,  Jinyu XIAO ,  Wei SU ,  Weifeng SUN ,  Longxing SHI

IPC: H02P25/08 ,  H02P23/04

Abstract: A method and an apparatus for reducing noise of a switched reluctance motor, includes: supplying a PWM signal as a driving signal to a driving circuit of a switched reluctance motor; and varying a carrier frequency of the PWM signal as an operation period of the switched reluctance motor varies; if the switched reluctance motor changes phase, determining that the operation period of the switched reluctance motor varies.

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