Power source device, image forming apparatus and voltage control method
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United States of America Patent
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May 22, 2018
Issued Date -
N/A
app pub date -
Dec 29, 2014
filing date -
Jan 6, 2014
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Abstract
The power source device comprises a transformer, a voltage detection unit, a CPU and a drive circuit. Through an applying of a DC voltage, the transformer generates an AC voltage for development of an amplitude corresponding to the voltage value and an applying time of the DC voltage. The voltage detection unit detects a voltage value of the DC voltage. The CPU sets a reference value and generates PWM signals for controlling the applying time in accordance with a difference between the voltage value detected in the voltage detection unit and the reference value. The reference value is a voltage value of the DC voltage when an amplitude of the AC voltage reaches a predetermined value in a predetermined applying time. Controlling the applying time of the DC voltage to the transformer in accordance with the PWM signals, the drive circuit suppress variation in amplitude of the AC voltage.
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