Transfer device, image forming apparatus, and power supply control method

摘要

A transfer device includes a power supply control unit, a direct-current (DC) power supply, an alternating-current (AC) power supply, and a transfer unit. The power supply control unit controls a first control signal for controlling a DC voltage and a second control signal for controlling an AC voltage based on a condition relating to image formation. The DC power supply outputs the DC voltage based on the first control signal. The AC power supply selectively outputs, with a particular waveform, either of the DC voltage output from the DC power supply or a superimposed voltage obtained by superimposing the AC voltage determined based on the second control signal on the DC voltage output from the DC power supply. The transfer unit transfers a developer onto a sheet using a voltage output from the AC power supply.

主权项

1. A transfer device comprising:
a power supply controller configured to control a first control signal and a second control signal, which is a pulse signal, based on a condition relating to image formation; a DC power supply configured to output a DC voltage based on the first control signal; an AC power supply configured to selectively output either of the DC voltage output from the DC power supply or a superimposed voltage obtained by oscillating the DC voltage output from the DC power supply with an amplitude determined based on a duty ratio of the second control signal; and a transfer unit configured to transfer a developer onto a sheet using a voltage output from the AC power supply, wherein: the power supply controller further controls a third control signal based on the condition relating to image formation, and the AC power supply controls a frequency of the voltage output from the AC power supply based on a frequency of the third control signal.