HEATER CONTROL DEVICE AND IMAGE FORMING APPARATUS

摘要

A heater controller and heater control method is disclosed. The hater controller includes a detector, a determination circuit, a limiting circuit, a selection circuit, and a driving circuit. The detector detects a temperature of the heating object, which is heated by the heater. The determination circuit determines turn-on ratio for the heater for every control cycle of AC voltage, based on the surface temperature of the heating object and a target temperature of the heating object. The limiting circuit limits the turn-on ratio of current control cycle when the control method of previous control cycle is phase control. The selection circuit selects control pattern to control the heater, based on the turn-on ratio, and the driving circuit applies a heater driving signal to the heater.

主权项

1. A heater controller for a heater, the heater controller comprising:
a detector that detects a temperature of a heating object, the heating object is heated by the heater; a determination circuit that determines, based on a surface temperature of the heating object and a target temperature of the heating object, a turn-on ratio of the heater for every control cycle of an AC voltage; a limiting circuit that limits the turn-on ratio of a current control cycle when a control method of a previous control cycle is phase control; a selection circuit that selects a control pattern to control the heater, based on the turn-on ratio limited by the limiting circuit; and a driving circuit that outputs a heater driving signal to the heater according to the control pattern selected by the selection circuit.