AC high-voltage device, image forming apparatus, and AC high-voltage output controlling method

摘要

PROBLEM TO BE SOLVED: To compatibly secure safety and use efficiency by optimizing abnormal stop control to be performed in accordance with the occurrence of an overcurrent in the output of AC high voltage.;SOLUTION: An AC driving control part 212 controls a transformer at constant voltage designated by a PWM from a master control part 30, so as to output the AC high voltage. By entering a detection signal of the overcurrent occurring in the output of the AC high voltage detected by a detection part 213 in a comparator circuit (1) 215, and performing intermittent output control that PWM control input in the AC driving control part is turned off for a predetermined time and then the control is switched to constant-voltage control again, firing or the like is avoided even if abnormal discharge is continued, and the safety is secured. By performing the intermittent output control, a period when the necessity (detection of SC) of abnormal processing (abnormal stop or the like) is grasped by the master control part 30 is secured to be long, the erroneous detection of SC caused by instantaneous disturbance noise or the like is avoided, and normal operation is continued.;COPYRIGHT: (C)2007,JPO&INPIT