Image forming apparatus

An image forming apparatus comprising:

• a conveying unit configured to convey a recording medium;
• an image forming unit that forms an image on the conveyed recording medium;
• a fusing unit including a heater that receives electric power from an AC power source and a rotator that is disposed as opposed to the heater and rotates to convey the recording medium, the fusing unit configured to fuse the image formed on the recording medium to the recording medium due to heating by the heater at a fusing position as a position where the heater and the rotator nip the recording medium therebetween;
• a switching circuit configured to switch on/off current-feeding from the AC power source to the heater;
• a temperature detector configured to detect temperature of the heater;
• a current-feed controller configured to execute a first current-feed mode of changing a current-feed ratio of current-feed time from the AC power source to the heater to unit time by controlling switching of the switching circuit so that the temperature detected by the temperature detector falls within a target range;
• and
• a position detector that detects position of the conveyed recording medium, wherein
• the current-feed controller executes a second current-feed mode of fixing the current-feed ratio to almost 100% or almost 0% during execution of the first current-feed mode in place of the first current-feed mode based on a timing when the position detector detects that an end of the recording medium in a conveying direction is located at the fusing position.