POWER SUPPLY DEVICE, IMAGE FORMING APPARATUS, AND OUTPUT CONTROL METHOD

PROBLEM TO BE SOLVED: To provide a power supply device configured to start a DC power source without causing a start-up failure, and an image forming apparatus and an output control method.SOLUTION: A power supply device includes: a first DC power source which outputs first DC voltage having a predetermined polarity; a second DC power source which is connected in series to the first DC power source and outputs second DC voltage having a polarity opposite to the predetermined polarity; an AC power source which is connected in series to the first and second DC power sources, and outputs any of the first DC voltage, the second DC voltage, and a superimposed voltage formed by superimposing the second DC voltage on an AC voltage; and a capacitor which allows a current to flow in when the AC power source outputs the voltage and is connected in parallel to the first and second DC power sources. The first DC power source stops output of the first DC voltage a predetermined time before the second DC power source starts outputting the second DC voltage. 【課題】起動不全を生じさせずに直流電源を起動可能である電源装置、画像形成装置及び出力制御方法を提供する。【解決手段】所定極性の第１直流電圧を出力する第１直流電源と、第１直流電源と直列に接続され、所定極性と逆極性の第２直流電圧を出力する第２直流電源と、第１直流電源及び第２直流電源と直列に接続され、第１直流電圧、第２直流電圧、及び第２直流電圧と交流電圧とを重畳した重畳電圧のいずれかを出力する交流電源と、交流電源の出力に伴って電流が流れ込み、かつ、第１直流電源及び第２直流電源に対して並列に接続されたコンデンサと、を備え、第１直流電源は、第２直流電源による第２直流電圧の出力が開始される所定時間前に、第１直流電圧の出力を停止する。【選択図】図８