| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply device and an image forming apparatus capable of controlling power supply control to an electrical load speedily and stably. <P>SOLUTION: When a detected current value 'i' deviates from a range between an upper limit value th1 and a lower limit value th2, a pulse width adjustment operation for increasing or decreasing a currently set counter value is repeatedly performed at every operation time interval t1 such that the detected current value is brought to be close to the range between the upper limit value th1 and the lower limit value th2 under a forward control. When the detected current value falls in the range between the upper and the lower limit values th1, th2 after execution of the forward control, a reverse control is executed such that a pulse width of a PWM signal S1 (S2) is changed in an adjustment direction opposite to that under the forward control. <P>COPYRIGHT: (C)2007,JPO&INPIT |
