IMAGE FORMING APPARATUS

摘要

There is disclosed an image forming apparatus where at suitable positions in a power supply path of a first heat generating member and a second heat generating member which can be switched to a series connection condition and a parallel connection condition, there are arranged a current detection section including a circuit which detects a current subjected to rectification of a positive half wave and a circuit which detects a current subjected to rectification of a negative half wave, and an applied voltage detection section including a circuit which detects a voltage subjected to full-wave rectification. Consequently, in the image forming apparatus which can be used in districts using different power supply voltages, failure of the apparatus can be detected, and reliability of the apparatus can be enhanced.

主权项

1. An image forming apparatus comprising:
a fixing section which heat-fixes an image formed on a recording material to the recording material, the fixing section including a first heat generating member and a second heat generating member which generate heat by a power supplied from a power supply through a power supply path; and a connection condition switch section which switches the first heat generating member and the second heat generating member between a series connection condition and a parallel connection condition, wherein said image forming apparatus further comprises: a first circuit disposed so that voltages applied to both ends of the first heat generating member and voltages applied to both ends of the second heat generating member are detectable, to detect the voltages of a positive phase and a negative phase of an alternating current waveform; a second circuit that detects a current of the positive phase of the alternating current waveform, the second circuit being disposed in the power supply path on the second heat generating member side after branching toward the first heat generating member and the second heat generating member in the parallel connection condition, or at a position in which the voltages applied to both the ends of the first heat generating member and the voltages applied to both the ends of the second heat generating member are detectable, to detect the voltage of the positive phase of the alternating current waveform; and a third circuit that detects a current of the negative phase of the alternating current waveform, the third circuit being disposed in the power supply path on the second heat generating member side after branching toward the first heat generating member and the second heat generating member in the parallel connection condition, or at a position in which the voltages applied to both the ends of the first heat generating member and the voltages applied to both the ends of the second heat generating member are detectable, to detect the voltage of the negative phase of the alternating current waveform.