| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an accurate switching power supply unit without increasing the power consumption of a pseudo load, and an image forming device carrying the same. <P>SOLUTION: When the output of a secondary voltage Vb exceeds the voltage set by the zener voltage Vz of a Zener diode 35, a transistor 36 is turned on, allowing the secondary voltage Vb to be fed back. The secondary voltage Vb fed back by the current decided by a resistor 37 controls the FB terminal current of a power controller 32, while maintaining balance with the feedback of the secondary voltage Va. This enables suppression of sudden rise in the secondary voltage Vb, while the accuracy of the secondary voltage Va can be kept to be within the range of tolerance. <P>COPYRIGHT: (C)2007,JPO&INPIT |
