40results about How to "Avoid breakdown damage" patented technology

The invention discloses a constant temperature control system and control method for an X-ray fluorescence spectrometer, which consists of two parts of temperature measurement and temperature control. The temperature measurement part includes: constant current source drive circuit, bridge temperature measurement circuit, and filter limiter circuit; the control algorithm adopts PID linear controller and Fuzzy controller hybrid control; the heater drive circuit adopts photocoupler combined with bidirectional thyristor AC power control. The system of the invention has stable performance and strong anti-interference ability, and can realize a temperature resolution of 0.1°C, and a temperature setting and control accuracy of 36±0.2°C. The system of the invention can not only provide a constant temperature environment for the sample chamber and the spectroscopic chamber of the X-ray fluorescence spectrometer, but also can be applied to the measurement and testing of small environmental occasions requiring constant temperature adjustment.

The invention provides a wind turbine generator blade anti-thunder air-terminal system. The system comprises a blade tip air termination, a shielding device, a lower guiding body, and at least two pairs of blade intermediate air terminations. The blade tip air termination and each blade intermediate air termination are respectively arranged on the blade tip of a wind turbine generator blade and the position of a blade surface, far away from the blade tip. The lower guiding body is arranged in the wind turbine generator blade, one end is connected with the blade tip air termination, and the other end is connected with each pair of blade intermediate air terminations, and the lower guiding body is used to lead lightening current into ground. The shielding device is arranged on two surfaces of the wind turbine generator blade, one end is connected with the blade tip air termination, and the other end is connected with the blade intermediate air termination, and the shielding device is used to shield discharge effect of the surface of the lower guiding body. Through embedding the metal shielding device on a suction surface and a pressure surface of the blade, surface electric field ofthe internal lower guiding body can be effectively shielded, and possibility of discharge of the surface of the lower guiding body is reduced, so that probability of failure lightning protection caused by failure of an air-terminal structure is effectively reduced, and the number of lightning stroke subjected to the blade is reduced.