| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of continuing power supply to the utmost while coping with an abnormal state such as overcurrent or overvoltage. <P>SOLUTION: If transfer voltage V detected by a voltage detection circuit 130 exceeds upper limit voltage Vlim while performing constant current control to a detection current I, the constant current control is stopped, and the PWM value of a PWM signal S1 is increased/decreased stepwise in a direction where the detection voltage V is lower than the upper limit voltage Vlim regardless of the detection current I. Thereafter, the constant current control is restarted on a condition that the detection voltage V is lower than the upper limit voltage Vlim. <P>COPYRIGHT: (C)2008,JPO&INPIT |
