Donghua University

Stmicroelectronics (Shenzhen) R&d Co. Ltd.

Petkit Network Technology (Shanghai) Co., Ltd.

Yiwei Zhang

Huaiping Rong

Keqing Han

Muhuo Yu

Qinli Dong

Zhaohua Wang

Yincai Tian

Chao Li

Ni Zeng

Gang Zha

Junchao Zhang

Xianfeng Xiong

Da Song Lin

Xi Zhao

Intelligent antibacterial bowl

Processes for producing carbon fiber, the filament thereof and pre-oxidized fiber are provided. In one embodiment, the gel spinning of polyacrylonitrile filament is achieved by using small-molecule gelling agent, and the carbon fiber obtained thereby is increased by 15% to 40% in tensile strength and by 20% to 35% in toughness. In another embodiment, the melt spinning process of polyacrylonitrile is conducted by using imidazole type ion liquid as plasticizer, the process reduces environment pollution, is suitable for industrial production and the fiber produced thereby is improved in its strength. In yet another embodiment, polyacrylonitrile pre-oxidized fiber is produced by melt spinning, so low cost and controllable pre-oxidization of polyacrylonitrile can be achieved. In a further embodiment, high strength carbon fiber is manufactured by using polymer thickening agent. In another further embodiment, low cost and controllable pre-oxidization of polyacrylonitrile is achieved by conducting pre-oxidization before spinning, minimizing skin-core structure, so as to produce high performance carbon fiber, and reduce the production cost of carbon fiber greatly.

Gel spinning process for producing a pan-based precursor fiber

Process of making pan-based carbon fiber

Process of melt-spinning polyacrylonitrile fiber

An embodiment of the invention relates to a power converter formed with an error amplifier and a related method. In an embodiment, a first switch is coupled in series with an error amplifier compensation capacitor. Upon detection of a current level greater than a threshold level, the compensation capacitor is decoupled from the error amplifier by opening the first switch. In an embodiment, a second switch is coupled in parallel with the compensation capacitor, and the current-sensing circuit enables conductivity of the second switch to discharge the compensation capacitor upon detection of the current level greater than the threshold level. The second switch is opened upon detection of the current level less than the threshold level. In an embodiment, the current-sensing circuit controls an output current of the power converter at a current-limit level upon detection of the internal current level greater than the threshold level.

Regulator over-voltage protection circuit with reduced standby current

Growing community of inventors

Shanghai, China

Yiwei Zhang