Patent ID: 9098026
Filing Date: 2015-08-04
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit configured to form a toner image on a sheet; a fixing unit configured to fix the toner image formed on the sheet by heat; a temperature detection unit configured to detect a temperature of the fixing unit; a power measurement unit configured to measure a fixing power consumption to be consumed by the fixing unit; a current measurement circuit configured to measure a current flowing from the alternating power supply to the image forming apparatus; and a control unit configured to determine a second fixing power to be supplied to the fixing unit based on a temperature difference between a temperature to be detected by the temperature detection unit and a target temperature of the fixing unit, the fixing power consumption measured by the power measurement unit, and a first fixing power determined previously, and to generate a control signal for supplying the determined power to the fixing unit, wherein, in a case where a second controlling value for obtaining the second fixing power is larger than a first controlling value for obtaining the first fixing power for more than or equal to a first predetermined value, the control unit is configured to correct the second controlling value to a controlling value obtained by adding the first predetermined value to the first controlling value, and wherein, in a case where the current measured by the current measurement circuit exceeds a predetermined upper limit value, the control unit is configured to control a power to be supplied to the fixing unit based on a third controlling value which is obtained by subtracting a second predetermined value from the second controlling value.