Southeast University

Csmc Technologies Fab2 Co., Ltd.

Jinyu Xiao

Longxing Shi

Weifeng Sun

Wei Su

Hao Wang

Shen Xu

Sen Zhang

Minggang Chen

Rongrong Tao

Rui Zhong

Mingshu Zhang

An automatic dead zone time optimization system in a primary-side regulation flyback power supply continuous conduction mode (CCM), including a closed loop formed by a control system, including a single output digital to analog converter (DAC) midpoint sampling module, a digital control module, a current detection module, a dead zone time calculation module and a pulse-width modulation (PWM) driving module, and a controlled synchronous rectification primary-side regulation flyback converter. A primary-side current is sampled using a DAC Sampling mechanism to calculate a secondary-side average current, so as to obtain a primary-side average current and a secondary-side average current, 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; and the PWM driving module is jointly controlled by a primary-side regulation loop and the obtained dead zone time.

Deadtime automatic-optimization system for flyback power supply having primary-side feedback in CCM, control system and method for flyback power supply having primary-side feedback in CCM

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.

Method for reducing noise of a switched reluctance motor based on adjusting a PWM carrier frequency

A method for improving the conversion efficiency of a CCM mode of a flyback resonant switch power supply, comprising: presetting a critical value Tset, calculating a time interval Ttap between adjacent zero points in the current connection time, outputting a shutdown signal at the zero points, and comparing the time interval Ttap with the preset critical value Tset; when Ttap&#x3e;Tset, controlling the current shutdown time to be less than the shutdown time of the preceding cycle and outputting a start signal; when Ttap=0, controlling the current shutdown time to be greater than the shutdown time of the preceding cycle and outputting a start signal; and when 0&#x3c;Ttap&#x3c;=Tset, controlling the current shutdown time to be the same as the shutdown time of the preceding switch cycle and outputting a start signal.

Method for improving conversion efficiency of CCM mode of flyback resonant switch power supply

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Wuxi New District, China

Jinyu Xiao