公开(公告)号：US4520494A

公开(公告)日：1985-05-28

申请号：US502117

申请日：1983-06-08

申请人： Masataka Arita ,  Mitsuyoshi Matsubara

发明人： Masataka Arita ,  Mitsuyoshi Matsubara

IPC分类号： H05G1/32 ,  H05G1/34 ,  H05G1/46 ,  G03B41/16 ,  H05G1/10 ,  H05G1/30

CPC分类号： H05G1/46 ,  H05G1/32 ,  H05G1/34

摘要： A falling load type X-ray diagnostic apparatus comprises a low voltage power source, AC-DC converting means connected to the low voltage power source so as to apply a rectified low DC voltage, chopping means connected to the AC-DC converting means and chopping said DC voltage into a low AC voltage, high voltage applying means for transforming said low AC voltage into a high AC voltage, said high AC voltage being applied as a tube voltage to an X-ray tube from which X-rays are irradiated toward an object to be examined, means for controlling a filament heating power of the X-ray tube, programming means for supplying a control signal to said filament heating control means so as to reduce the emission current of said X-ray tube during the irradiation, and chopper control means for controlling the chopping ratio of said chopping means by evaluating said rectified DC voltage with a preset tube voltage generated in said programming means, said programming means compensating said tube voltage by receiving said control signal in such a manner that said tube voltage is maintained substantially constant during the irradiation by varying said preset tube voltage so as to control the chopping ratio based upon the reduction of the filament heating power for the X-ray tube.

摘要翻译： 跌落型X射线诊断装置包括低压电源，连接到低压电源的AC-DC转换装置，以施加整流的低DC电压，连接到AC-DC转换装置的斩波装置和斩波 将所述直流电压转换为低交流电压，将所述低交流电压变换为高交流电压的高电压施加装置，将所述高交流电压作为管电压施加到从其照射X射线的X射线管 被检查对象，用于控制X射线管的灯丝加热功率的装置，用于向所述灯丝加热控制装置提供控制信号以减少照射期间所述X射线管的发射电流的编程装置，以及 斩波控制装置，用于通过用在所述编程装置中产生的预设管电压评估所述整流DC电压来控制所述斩波装置的斩波比，所述编程装置补偿所述管电压 通过接收所述控制信号，使得通过改变所述预设管电压，在照射期间所述管电压保持基本上恒定，以便基于X射线管的灯丝加热功率的减小来控制斩波比。