Power supply and image forming apparatus

A power supply comprising:

• a transformer;
• a switching unit configured to drive the transformer at a primary side of the transformer;
• a voltage adjustment unit configured to adjust voltage of a capacitive element at a secondary side of the transformer;
• and
• a constant voltage member connected to a side outputting voltage to the capacitive element at the secondary side of the transformer, wherein
• the constant voltage member is off and a voltage having a predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a first voltage, and the constant voltage member is turned on and a voltage having a polarity opposite to the predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a second voltage higher than the first voltage.

An image forming apparatus comprising:

• an image forming unit configured to form an image on a recording medium;
• and
• a power supply that outputs power to the image forming unit, wherein
• the power supply includes:
• a transformer;
• a switching unit configured to drive the transformer at a primary side of the transformer;
• a voltage adjustment unit configured to adjust voltage of a capacitive element at a secondary side of the transformer;
• a first constant voltage member connected to a terminal of the capacitive element at a side of the transformer;
• and
• a second constant voltage member connected to a terminal different from the terminal of the capacitive element at the side of the transformer, wherein
• wherein the first constant voltage member is turned on and a voltage having a predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a first voltage, and the second constant voltage member is turned on and a voltage having a polarity opposite to the predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a second voltage higher than the first voltage.

An image forming apparatus comprising:

• an image forming unit configured to form an image on a recording medium;
• and
• a power supply that outputs power to the image forming unit, wherein
• the power supply includes:
• a transformer;
• a switching unit configured to drive the transformer at a primary side of the transformer;
• a voltage adjustment unit configured to adjust voltage of a capacitive element at a secondary side of the transformer;
• and
• a constant voltage member connected to a side outputting voltage to the capacitive element at the secondary side of the transformer, wherein
• the constant voltage member is off and a voltage having a predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a first voltage, and the constant voltage member is turned on and a voltage having a polarity opposite to the predetermined polarity is output through the capacitive element in a case where the voltage of the capacitive element is a second voltage higher than the first voltage.