Patent ID: 8918007

Claim:
An image forming apparatus, comprising: a developing unit configured to carry out developing by causing a developer to adhere to an electrostatic latent image formed on an image carrier; and a voltage generating circuit configured to supply to the developing unit a development bias voltage in which a voltage of a positive pulse is different from a voltage of a negative pulse; wherein the voltage generating circuit comprises a voltage conversion unit configured to convert a voltage inputted from a primary side to a voltage of a different magnitude and outputs to a secondary side, a bridge circuit connected to the primary side, a first switching regulator configured to generate a first voltage to be applied to the bridge circuit, and a second switching regulator configured to generate a second voltage to be applied to the bridge circuit, and wherein a drive frequency of the first switching regulator and a drive frequency of the second switching regulator are configured so that an absolute value of a difference between the drive frequency of the first switching regulator and the drive frequency of the second switching regulator is not less than a predetermined frequency.