FIXING APPARATUS
First Claim
1. A fixing apparatus comprising, a heating unit having a heating element that heats a toner image, a control unit that controls power supplied from an AC power supply to the heating element, and a limiting unit that limits the supply of power from the AC power supply to the heating element by a hardware circuit,wherein, when N is an integer, the control unit controls to make the power supplied in positive half-waves and the power supplied in negative half-waves symmetric in a control period including a plurality of N half-waves of the AC power supply, andwhen M is an integer, the control unit controls to supply the power of (N-M+1) half-waves from an M-th half-wave to an N-th half-wave after a limitation of the supply of the power by the limiting unit is released if the limiting unit limits the supply of the power from the AC power supply to the heating element at the M-th half-wave in the control period.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to perform control so that power supplied in positive half-waves and power supplied in negative half-waves are symmetric in a control period even if a safety circuit based on a hardware circuit is activated. A CPU 202a controls to supply power of six half-waves from a third half-wave to an eighth half-wave (sections of E to K of a power supply waveform) after a limitation in the supply of the power by the safety circuit is released if the safety circuit limits the supply of the power from an AC power supply 401 to a heater 301 in a third half-wave (section of C to D in the power supply waveform) in the control period.
29 Citations
5 Claims
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1. A fixing apparatus comprising, a heating unit having a heating element that heats a toner image, a control unit that controls power supplied from an AC power supply to the heating element, and a limiting unit that limits the supply of power from the AC power supply to the heating element by a hardware circuit,
wherein, when N is an integer, the control unit controls to make the power supplied in positive half-waves and the power supplied in negative half-waves symmetric in a control period including a plurality of N half-waves of the AC power supply, and when M is an integer, the control unit controls to supply the power of (N-M+1) half-waves from an M-th half-wave to an N-th half-wave after a limitation of the supply of the power by the limiting unit is released if the limiting unit limits the supply of the power from the AC power supply to the heating element at the M-th half-wave in the control period.
Specification