Image forming apparatus

An image forming apparatus comprising:

• a first sub power source including a capacitor;
• a second sub power source including a secondary battery;
• a first fixing heater for heating a fixing section to fix toner onto a recording sheet by an electric power supplied from the first sub power source;
• a second fixing heater for heating the fixing section by an electric power supplied from the second sub power source;
• a third fixing heater for heating the fixing section by an electric power supplied from an external power source serving as a main power source;
• a first charging switch for switching over charging and charge-suspending of the first sub power source;
• a second charging switch for switching over charging and charge-suspending of the second sub power source;
• a first charging/discharging switch for switching over discharging of the first sub power source to drive the first fixing heater, and charging of the first sub power source;
• a second charging/discharging switch for switching over discharging of the second sub power source to drive the second fixing heater, and charging of the second sub power source;
• a third heater driving switch for switching over driving of the third fixing heater by the electric power supplied from the external power source, and drive-suspending of the third fixing heater;
• an apparatus condition judger for judging whether the image forming apparatus is in a first condition where a rapid temperature rise is required to rapidly raise a temperature of the fixing section to a predetermined first temperature zone, or in a second condition where the temperature of the fixing section is required to be maintained in the first temperature zone;
• and
• a controller for controllably switching the first charging/discharging switch to the discharging, the second charging/discharging switch to the charging, the second charging switch to the charge-suspending, and the third heater driving switch to the driving when the apparatus condition judger judges that the apparatus is in the first condition, and for controllably switching the first charging/discharging switch to the charging, the first charging switch to the charge-suspending, the second charging/discharging switch to the discharging, and the third heater driving switch to the driving when the apparatus condition judger judges that the apparatus is in the second condition.