Southeast University

Csmc Technologies Fab2 Co., Ltd.

Shen Xu

Longxing Shi

Weifeng Sun

Shengli Lu

Siyang Liu

Wei Su

Qinsong Qian

Jing Zhu

Hao Wang

Jinyu Xiao

Miao Yang

Youshan Jin

Sichao Liu

Minggang Chen

Yujie Liu

Siyu Zhao

Yuan Gao

Sen Zhang

Wei Dong Wang

Feng Lin

Chong Wang

Dejin Wang

Congming Qi

Haiqing Zhang

Yunwu Zhang

Yongjia Li

Limin Yu

Yijie Qian

Chenxi Yang

Xiaoyu Shi

Xianjun Fan

Rongrong Tao

Ruizhi Wang

Kuo Yu

Rui Jiang

Wanqing Yang

Boyong He

Menglin Yu

Hu Zhang

Huaxin Zhang

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.

Inductor current estimation method for DC-DC switching power supply

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 Vin 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.

Multi-phase high-precision current sharing control method applied to constant on-time control

A synchronous rectification control system and method for a quasi-resonant flyback converter are provided. The control system includes a switching transistor voltage sampling circuit configured to sample an output terminal voltage of the switching transistor to obtain a sampled voltage of the switching transistor; a sampling calculation module configured to obtain a dead-time based on the sampled voltage of the switching transistor and a preset relationship, the preset relationship being a correspondence between the duration of the sampled voltage of the switching transistor being below a first preset value and the dead-time during an on-time of a switching cycle of the switching transistor, the dead-time being a time from when the switching transistor is turned off to when the synchronous rectification transistor is turned on; and a control module configured to receive the dead-time and control switching of the synchronous rectification transistor based on the dead-time.

Synchronous rectification control system and method for quasi-resonant flyback converter

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.

Flyback converter and output voltage acquisition method therefor and apparatus thereof

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 Sand a clamp switching transistor S; 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 S; 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.

System and method for controlling active clamp flyback converter

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

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.

Flyback switching power supply, control system thereof and control method therefor

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

Parasitic high-voltage diodes implemented by integration technology in a high-voltage level shift circuit are used for charging a bootstrap capacitor C, 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 Dand a second parasitic diode Dare provided between the VB and the PGD. The bootstrap control circuit is controlled by a high-side signal and a low-side signal.

Integrated bootstrap high-voltage driver chip and technological structure thereof

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.

Control method for improving dynamic response of switch power

A transverse ultra-thin insulated gate bipolar transistor having current density includes: a P substrate, where the P substrate is provided with a buried oxide layer thereon, the buried oxide layer is provided with an N epitaxial layer thereon, the N epitaxial layer is provided with an N well region and P base region therein, the P base region is provided with a first P contact region and an N source region therein, the N well region is provided with an N buffer region therein, the N well region is provided with a field oxide layer thereon, the N buffer region is provided with a P drain region therein, the N epitaxial layer is provided therein with a P base region array including a P annular base region, the P base region array is located between the N well region and the P base region, the P annular base region is provided with a second P contact region and an N annular source region therein, and the second P contact region is located in the N annular source region. The present invention greatly increases current density of a transverse ultra-thin insulated gate bipolar transistor, thus significantly improving the performance of an intelligent power module.

Transverse ultra-thin insulated gate bipolar transistor having high current density

A high-current, N-type silicon-on-insulator lateral insulated-gate bipolar transistor, including: a P-type substrate, a buried-oxide layer disposed on the P-type substrate, an N-type epitaxial layer disposed on the oxide layer, and an N-type buffer trap region. A P-type body region and an N-type central buffer trap region are disposed inside the N-type epitaxial layer; a P-type drain region is disposed in the buffer trap region; N-type source regions and a P-type body contact region are disposed in the P-type body region; an N-type base region and a P-type emitter region are disposed in the buffer trap region; gate and field oxide layers are disposed on the N-type epitaxial layer; polycrystalline silicon gates are disposed on the gate oxide layers; and a passivation layer and metal layers are disposed on the surface of the symmetrical transistor. P-type emitter region output and current density are improved without increasing the area of the transistor.

High-current N-type silicon-on-insulator lateral insulated-gate bipolar transistor

A switching power supply with a quick transient response is provided. A hysteretic control loop which comprises a hysteretic controller () and a control signal gate () is added to the original PWM control loop of the switching power supply. The hysteretic controller () is used to detect an output voltage (Vout) of the switching power supply and compare the output voltage (Vout) of the switching power supply with a reference voltage (Vref). When a load current (Iout) of the switching power supply is suddenly changed, the output voltage (Vout) of the switching power supply fluctuates. If the output voltage (Vout) of the switching power supply is in a setting range of the hysteretic voltage, output terminals (SELp, SELn) of the hysteretic controller () are in a low potential, and the control signal gate () selects output signals (Qp, Qn) from a PWM controller () as input signals of a gate signal drive circuit (). If the fluctuation of the output voltage (Vout) of the switching power supply exceeds the setting range of the hysteretic voltage, an output terminal (SELp, SELn) of the hysteretic controller () outputs a high potential, and the control signal gate () selects output signals (Qp, Qn) of the hysteretic controller () as input signals of the gate signal drive circuit (), so the operation of switching tubes () at the power lever () of the switching power supply is controlled to stabilize the output voltage (Vout).

Switching power supply with quick transient response

A switch level circuit () with dead time self-adapting control, which minimizes the switching loss in a switching power supply converter with synchronous rectification by changing a dead time between a high-side control transistor () and a low-side synchronous rectifying transistor (). The switch level circuit () includes the high-side control transistor () and the low-side synchronous rectifying transistor () which are controlled to be on and off by external control signals, and a waveform with a given duty cycle is outputted at a node (LX) between the two transistors. The switch level circuit () also includes a control module for adjusting the dead time. The control module comprises a sampling circuit () for detecting the current dead time at the node (LX), an adjusting circuit () for buffering and converting the sampling voltage sampled by the sampling circuit (), and a controlled delay unit () equipped with an external control input terminal, wherein the controlled delay unit () delays an external control signal and outputs the delayed signal to a controlled terminal of the low-side synchronous rectifying transistor () as a control signal. The switch level circuit () has simple structure, better performance and wide application range.

Switch level circuit with dead time self-adapting control

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Wuxi New District, China

Shen Xu