China University of Mining and Technology

Suzhou Powersite Electric Co., Ltd.

Wuxi Si-power Micro-electronics Co., Ltd.

Suzhou Powersite Electronic Co., Ltd.

Jie He

Xiumei Liu

Beibei Li

Qiang Huang

Ruirui Li

Wei Li

Ye Li

Jingjing Wang

Fei Chen

Shengfang Fan

Xiaosen Chen

Xiaochen Liu

Haibing Wang

Zhenzhen Dai

Zihao Xie

Yaoda Yue

Feiming Huang

Weizhong Wang

Huawen Xu

Bingyang Wang

Mingli Jiao

Fuhua Sun

Zhong Fan

Yongwei Xie

Shaobin Xiang

Linghang Wei

Yujia Zhang

Jichao Ma

Shenzhen Sun

Weiwei Liu

Disclosed are an isolation type power conversion method based on demagnetization iteration control and a power conversion circuit. The power conversion circuit comprises a high-frequency transformer, wherein a primary side of the high-frequency transformer is electrically connected with a primary side power tube in a power switch tube circuit, a secondary side of the high-frequency transformer is electrically connected with a charging capacitor circuit and an output feedback circuit through a secondary side synchronous rectifier tube, and the primary side and the secondary side of the high-frequency transformer are electrically connected with a power conversion integrated control chip. The present invention provides a novel demagnetization time iteration loop control architecture, which controls the switching of the primary side power tube by iteratively calculating the demagnetization time, and the method eliminates the right-half-plane zero of a flyback isolation power supply, increases the loop bandwidth and improves the response speed of the system. The influence of signal noise interference during high-speed dynamic response is eliminated through a ripple injection method, and a voltage adaptive turn-on time control technology is adopted, so that a primary side current sampling resistor is omitted, the system cost is reduced, and the system reliability is improved.

Isolation type power conversion method based on demagnetization iteration control and power conversion circuit

The present application provides a combined machine head and a ray imaging device, wherein the combined machine head comprises: a housing, having an enclosed cavity; a ray tube, arranged in the enclosed cavity; and a pump and a pipe, arranged in the enclosed cavity; wherein the pump is arranged on one side away from an anode of the ray tube, the pipe has a first end connected with an outlet of the pump and a second end extending to be near the anode of the ray tube; or the pump is arranged near the anode of the ray tube, the pipe has a first end connected to an inlet of the pump and a second end extending to one side away from the anode of the ray tube.

Combined machine head and ray imaging device

The present application discloses a pulse voltage generation device, method and controller, the device comprises: a transformer; a first AC/DC conversion circuit, with an alternating current side connected with a high-voltage side of the transformer; an energy storage capacitor, connected with a direct current side of the a first AC/DC conversion circuit, for storing electrical energy; and a discharge control circuit, in parallel connection with both ends of the energy storage capacitor, for controlling discharge of the energy storage capacitor to generate a high-voltage pulse. In the present application, an energy storage capacitor is arranged on a high-voltage side of the transformer, and a discharge control circuit is used to control the energy storage capacitor to discharge to generate a high-voltage pulse, avoiding the problem that frequency of the high-voltage pulse outputted on the high-voltage side is limited by variations of the induced magnetic field of the transformer, and is thus difficult to increase, and that the rising edge and falling edge of the high-voltage pulse take a long time.

Pulse voltage generation device, method, and controller

The present invention discloses a gas-powder separation three-phase jet flow fire monitor system, including a gas-powder separation three-phase fire monitor head, a filter, a nitrogen pressurization apparatus and a dry powder tank. The dry powder tank is connected to a gas-powder mixture inlet pipe of the gas-powder separation three-phase fire monitor head through a pipeline. A nitrogen outlet pipe of the gas-powder separation three-phase fire monitor head is connected with one end of the nitrogen pressurization apparatus through the filter. The other end of the nitrogen pressurization apparatus is connected with the dry powder tank. The present invention is simple in structure and convenient to use. A cyclone separation apparatus of a dry powder pipeline of the fire monitor may separate nitrogen from conveyed ultrafine dry powder to enable the ultrafine dry powder to be fully mixed with a water-based fire extinguishing agent, thereby reducing an atomization degree of jet flow and enlarging a range of the fire monitor. In addition, the separated nitrogen enters the dry powder tank for recycling after being pressurized by the pressurization apparatus, thereby reducing the fire extinguishing cost.

Gas-powder separation three-phase jet flow fire monitor system

Disclosed in the present invention is a double-spring and high-precision hysteretic pressure control valve, including an upper valve body, a lower valve body, a double-spring pressure adjustment valve, a spring energy storage linkage mechanism, and a main valve. The double-spring pressure adjustment valve includes a rough adjustment stud, a rough adjustment spring, a fine adjustment stud, a fine adjustment spring, a spring guide sleeve, and a pressure adjustment valve spool. The spring energy storage linkage mechanism includes a guide block, a valve spool control linkage, a tension spring, and a tension spring shift lever and a tension spring sliding hook. The valve spool control linkage is connected to the guide block at one end, and connected to a main valve spool drive rod via a pin at the other end. The tension spring sliding hook is mounted on the guide block, and one end of the shift lever is placed below the tension spring sliding hook so as to drive the tension spring sliding hook to move upwards, thereby controlling the state of the tension spring and enabling energy storage of the spring. The spring energy storage linkage mechanism make the valve spool to open and close momentarily at the right portion. The double-spring and high-precision hysteretic pressure control valve according to the present invention has a low cost, and can provide precise control of opening and closing pressures for the pressure control valve and control of both states of opening and closing for the main valve.

Double-spring and high-precision hysteretic pressure control valve

A self-heat-dissipation pressure-reducing valve includes: a heat-dissipation valve core, an upper valve deck, a guiding valve deck, a valve body, a heat-dissipation valve seat, an air guide hood, and a turbine-type heat dissipation device. The heat-dissipation valve core is formed by a valve core composed of a heat pipe, and valve core heat-dissipation fins. The heat-dissipation valve seat includes a valve seat pocket, a valve seat shell, heat pipes, and valve seat heat-dissipation fins. An outer circumferential surface of the valve seat pocket is wound with multiple heat pipes fixed to the valve seat heat-dissipation fins. The turbine-type heat dissipation device includes a fan shell provided at a medium inlet, and a turbine. The turbine is lashed by a medium to turn the fan shell, and wind is guided in one direction through the external air guide hood to implement heat dissipation.

Self-heat-dissipation pressure-reducing valve

Growing community of inventors

Jiangsu, China

Jie He