Heater, fixing unit and image forming apparatus

摘要

A heater is operable with a main power supply unit and a chargeable auxiliary power supplying unit. The heater includes a heater part having one or a plurality of heater elements to receive power from the main and auxiliary power supplying units, a detecting means to detect information related to the heater part, and a control means to vary an amount of power supplied from the auxiliary power supply unit to the heater part per unit time based on the information detected by the detecting means.