Chengdu Monolithic Power Systems Co., Ltd.

Alibaba Group Holding Limited

Advanced New Technologies Co., Ltd.

Alipay (hangzhou) Information Technology Co., Ltd.

Hangzhou Mps Semiconductor Technology Ltd.

Zhejiang Dahua Technology Co., Ltd.

Zhejiang Zone-king Environmental Sci&tech Co., Ltd

Hangzhou Normal University

Hui Li

Le Song

Siran Wang

Lin Wang

Chen Chen

Xiaofu Chang

Xuefeng Chen

Guanyin Zhu

Kailiang Hu

Xin Huang

Zhibang Ge

Chunyang Wen

Yiguang Wang

Lei Miao

Lin Feng

Guanhai Zhong

Yufeng Wang

Weilong Zhuo

Ping Tian

Shenqiu Tan

Junming Zhang

Yuedong Chen

Hao Long

Guangzhuo Li

Junqiu Liu

Shuai Wang

Jiayou Ye

Baiheng Wu

Xinyang Peng

Yuqi Wu

Quan Tang

Yiru Shao

Tao Wu

Long Du

Xia Zhou

A controller used in an isolated switching converter having a transformer and a primary switch. The controller has an error amplifying circuit, a control generator, an isolation circuit and a threshold generator. The error amplifying circuit generates a first compensation signal based on the difference between an output feedback signal and a reference voltage. The control generator generates a first and second control signals based on the first compensation signal. The isolation circuit provides a first synchronous signal electrically isolated from the first control signal. The threshold generator generates a current threshold voltage for controlling a maximum current flowing through the primary switch. The current threshold voltage gradually increases during a start-up period, and is generated based on the first synchronous signal after the start-up period.

Isolated switching converter and method for soft-start on primary side and secondary side

A controller used in an isolated switching converter. The controller has an error amplifying circuit for generating a first compensation signal based on the difference between an output feedback signal and a reference voltage, a control generator for generating a first and second control signals based on the first compensation signal, an isolation circuit for providing a first synchronous signal electrically isolated from the first control signal and a second synchronous signal electrically isolated from the second control signal, an upper threshold generator for providing an upper threshold voltage, and a peak current generator for providing a peak current signal for controlling a peak value of a current flowing through the primary switch based on the first synchronous signal, the second synchronous signal and the upper threshold voltage. The upper threshold voltage is adjusted above a first upper threshold voltage when a peak power demand is made.

Isolated switching converter for peak power demand and control method thereof

A controller used in an isolated switching converter having a transformer, a primary switch and a secondary switch. The controller has an error amplifying circuit, a control generator and an isolation circuit. The error amplifying circuit generates a first compensation signal based on the difference between a reference voltage and an output feedback signal. The control generator generates a first and second control signals based on the first compensation signal. The isolation circuit has a first channel for providing a first synchronous signal electrically isolated from the first control signal, for controlling a peak value of a current flowing through the primary switch, and has a second channel for providing a second synchronous signal electrically isolated from the second control signal, for controlling the switching frequency of the primary switch.

Isolated switching converter with two isolated channels and control method thereof

A power supply control circuit for controlling a charging process of a power supply capacitor to produce a power supply voltage to power a power control chip is disclosed. The power supply control circuit has a charging switch controlled by a charging control signal, and the power supply capacitor is coupled to an input voltage when the charging switch is on. The power supply control circuit further has a charging control circuit, configured to provide the charging control signal to control the charging switch based on the input voltage, the power supply voltage and a voltage threshold. Thus a high turns ratio of an auxiliary winding to a secondary winding is not necessary, high voltage devices are not needed and the power dissipation caused by the high voltage is also reduced.

Voltage converter and a power supply control circuit thereof

A dual-modal information storage and anti-counterfeiting material, and its preparation method are provided. The dual-modal information storage and anti-counterfeiting material uses cadmium sulfide quantum dots (CdS QDs) as information storage material, and uses the controllable photocorrosion of CdS QDs to achieve dual-modal optical information storage and anti-counterfeiting applications. Firstly, the type of ligands and modification degree of CdS QDs are precisely controlled during the aqueous phase synthesise process, so as to effectively control the photocorrosion phenomenon under UV light irradiation. Subsequently, the CdS QDs are loaded in the hydrogel network, and they are also loaded on the substrates such as cloth and paper by spray coating, dip coating or 3D printing, and the information is stored by digital light patterning. Different from the photochromic function of traditional anti-counterfeiting material, the CdS QDs shows dual-modal patterning characteristics in a wide wavelength range.

Dual-modal information storage and anti-counterfeiting material, and its preparation method

An isolated switching regulator with adjustable power supplies is discussed. The isolated switching regulator includes a control circuit having a loop controller and a driver, which are powered by different power source based on different output voltage conditions.

Isolated switching regulators with smart power supply and the method thereof

A controller of a switching converter having a switch and an energy storage component. The controller has a hysteresis feedback circuit for generating a hysteresis feedback signal based on an output feedback signal of the switching converter, a first comparison circuit for generating a first comparison signal by comparing the hysteresis feedback signal with a ramp signal, a second comparison circuit for generating a second comparison signal by comparing the output feedback signal with the ramp signal, and a turn-on control circuit. The turn-on control circuit generates a target locked valley number based on a valley pulse signal in response to one or more valleys of a voltage drop across the switch, the first comparison signal, the second comparison signal and a current locked valley number, and further generates a turning on control signal corresponding to the target locked valley number for turning ON the switch.

Switching converter with quasi-resonant control and control method thereof

A noise control circuit of a switching mode power supply is disclosed. The switching mode power supply has a primary switch, a secondary switch and a transformer with a primary winding and a secondary winding. The noise control circuit includes a reverse noise generating circuit having a first input terminal coupled to a first pulse terminal or a second pulse terminal of the primary switch, a second input terminal configured to receive an adjusting signal, and an output terminal configured to provide a noise control signal. The secondary winding has a first terminal and a second terminal. The noise control signal is coupled to either terminal of the secondary winding of the transformer.

Noise control circuit for a switching mode power supply and a method thereof

The present disclosure relates to systems and methods for connecting to a wireless network. The methods may include obtaining, within a dwell time, at least one packet transmitting on a current channel among a plurality of predetermined channels, wherein the plurality of predetermined channels at least include a target channel on which a connection to the wireless network is to be established; determining a matching score of the current channel based on the at least one packet, wherein the matching score reflects a likelihood that the current channel is the target channel; and determining, based on the matching score, an additional dwell time for continuing dwelling on the current channel to further evaluate the likelihood that the current channel is the target channel.

Systems and methods for connecting to a wireless network

A method for controlling a switching mode power supply is disclosed. An auxiliary winding feedback voltage of the switching mode power supply is sampled and held to obtain an auxiliary winding sample hold voltage. The auxiliary winding feedback voltage is sampled and held at an inflection point time to obtain an auxiliary winding inflection point voltage when the switching mode power supply operates in DCM or CRM. A secondary rectifier forward voltage signal is generated based on the auxiliary winding sample hold voltage and the auxiliary winding inflection point voltage before the switching mode power supply operates in CCM. A correction voltage is provided based on the secondary rectifier forward voltage signal when the switching power supply operates in CCM. An error amplifier signal is generated based on the correction voltage. The output power of the switching mode power supply is adjusted based on the error amplifier signal.

Control circuit of switching mode power supply and control method thereof

Systems and methods for determining a target hotspot list are provided. The system may obtain a first hotspot list generated by a first device. The first hotspot list may include one or more first hotspots detected by the first device. The system may obtain a second hotspot list generated by a second device. The second hotspot list may include one or more second hotspots detected by the second device. The system may generate the target hotspot list related to the second device based on the first hotspot list and the second hotspot list. In some embodiments, the system may further determine a target hotspot in the target hotspot list and send identification information associated with the target hotspot to the second device, such that the second device can be connected with the target hotspot.

Systems and methods for generating a target hotspot list

A control method of a zero-voltage switching converter with quasi-resonant control, the converter has a first switch and second switch respectively coupled to a primary winding and an auxiliary winding. The control method is: generating a hysteresis feedback signal based on an output feedback signal indicative of an output signal of the converter; comparing the hysteresis feedback signal with a ramp signal and generating a first comparison signal; comparing the output feedback signal with the ramp signal and generating a second comparison signal; generating a target locked valley number based on a valley pulse signal indicative of valleys of a voltage drop across the second switch, the first and second comparison signals; generating a turning on control signal corresponding to the target locked valley number for the second switch; and providing a control signal to turn on the first switch after turning off the second switch.

Converters and control methods of zero-voltage switching and quasi-resonant switching

A method comprises: removing most suspending solid pollutants after a primary treatment for the sewage which is then placed into a secondary biochemical treatment section; mixing the magnetic sludge carbon carrier and a solvent to prepare a mixed solution which is then placed into the secondary biochemical treatment section synchronously with the sewage; uniformly mixing the sewage, the magnetic sludge carbon carrier and the activated sludge in a biochemical treatment construction; performing a dreg-water separation in a sedimentation tank on the mixed solution flowing out of the secondary biochemical treatment section; and recycling magnetic particles with the magnetic separation apparatus. The sewage treatment process with a magnetic sludge carbon carrier cooperated with standard upgrading and capacity improvement, which not only addresses sludge removal in sewage treatment plants, but also is cooperated with standard upgrading and capacity improvement, has advantages of saving investment cost, good sewage treatment effect, environmental friendliness etc.

Sewage treatment process with magnetic sludge carbon carrier cooperated with standard upgrading and capacity improvement

A circuit for controlling a switching mode power supply having a power switch, having: a feedback pulse circuit, configured to receive a feedback signal, and to provide a feedback pulse signal; a load determining circuit, configured to receive the feedback signal, and to provide a load determining signal; a light load pulse circuit, configured to receive the load determining signal and a frequency regulating signal, and to provide a light load pulse signal; a frequency regulating circuit, configured to receive the load determining signal, the light load pulse signal and a normal load pulse signal, and to provide the frequency regulating signal; and a selecting circuit, configured to receive the load determining signal, the feedback pulse signal and the light load pulse signal, and to provide an on control signal and the normal load pulse signal; wherein the on control signal controls an on operation of the power switch.

Circuit for controlling a switching mode power supply and the method thereof

The present disclosure relates to network connection methods and devices for connecting a terminal device to a network through a network access device. The network access device may include a processor and a connection configuration component. The processor receives a connection request from the terminal device. The processor also authenticates the terminal device based on the connection request, and obtains a verified Internet protocol (IP) address from the connection configuration component. The processor further transmits the verified IP address to the terminal device after the terminal device is authenticated, wherein the terminal device is configured to be connected to the network by using the verified IP address.

Growing community of inventors

Hangzhou, China

Hui Li