| 摘要 |
PURPOSE:To reduce the cost and to improve efficiency, by constituting a power supply in a single converter transformer. CONSTITUTION:A power supply for electrophotographic device is composed of a single converter transformer T. On this primary winding 1 side a commercial power source 3 is connected through a rectifying and smoothing circuit 2. On the other, a switching transistor Q0 is provided which is driven by a PWM control circuit 4 and the power supply is controlled by a feedback signal from a voltage control circuit 12 and a control circuit 13. On the secondary side of this transformer T secondary windings 21-26 are provided to obtain the source voltage corresponding respectively to the fed sections except the backup of the electrophotographic device when the power is cut off, so that DC output can be obtained through a constant voltage circuit 11, etc. By appropriately using the secondary windings 21-26, the efficiency of the power consumption of the device is improved and stabilized output can be obtained under no influence by the current fluctuation each other.
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