Patent ID: 9703240
Date: 2017-07-11
CPC Classifications: G03G

Claim:
1. A fuser control device comprising: a fusing portion having a heater; a chopper portion including a reactor, a free-wheeling element, and a switching element; and a processor portion being configured to implement a first current control during an implementation period, the implementation period including a first time interval and a second time interval, the implementation period being longer than a commercial power period, the first current control for transferring a control signal having a predetermined duty ratio to the switching element during the first time interval and transferring a control signal having a 100% duty ratio to the switching element during the second time interval, wherein: the switching element is configured to deliver current to the heater while being driven at a switching frequency based on the control signal from the processor portion during the first time interval, the current having a switching period shorter than half the commercial power period, and to deliver current to the heater while not being driven during the second time interval; and the value of the predetermined duty ratio falls within a range causing no continuous current delivered to the heater.