Image forming apparatus and control method thereof

Abstract

Provided is an image device possessing a normal mode and a standby mode, comprising an image forming unit for imaging; a switching unit which selectively transfers supplied power to the image forming unit; a controller which controls the switching unit based on a phase signal of the power; a power cut-off unit which blocks the power from being transferred to the image forming unit in the standby mode; and a phase detector which is connected to two ends of the power cut-off unit, detects a phase of the power by different phase detection paths in normal mode and standby mode and outputs corresponding signals of a power sully so that power consumption of the image forming apparatus under a standby mode is not greater than a preset value.

Description

[0001] This application is a divisional application of an invention patent application with an application date of January 12, 2009, an application number of 200910003404.5, and an invention title of "imaging device and its control method". technical field [0002] The present general inventive concept relates to an image forming apparatus and a control method thereof, and more particularly, to an image forming apparatus and a control method thereof in which a phase of an alternating current (AC) power source is detected to perform fixing control. Background technique [0003] An image forming apparatus such as a printer, a multifunction peripheral, etc. forms an image on a recording medium such as paper or the like based on image data such as documents, photographs, or the like. In the case of an electrophotographic-type image forming apparatus such as a laser printer, toner developed on a photoconductor drum is transferred and fixed on a recording medium, thereby forming an...

AI Technical Summary

Problems solved by technology

However, if the image forming apparatus 1 enters the standby mode, the relay 12b is cut off, so that AC power cannot be supplied from the power supply 12 to the fixing unit 11a

[0007] However, in the conventional image forming apparatus 1, since the phase detector 14 is located downstream of the relay 12b, when the relay 12b is cut off and AC power is not supplied to the fixing unit 11a and the phase detector 14, the phase detector 14 cannot correctly detect the AC power phase of

Specifically, in the standby mode, it is necessary to monitor whether AC power is supplied to the conventional image forming apparatus 1, and to perform operations such as data backup, system reset (i.e., central processing unit (CPU) restart) if the AC power is cut off, but The operation cannot be performed because relay 12b is open

[0008] In order to solve this problem, a phase detector 14 is provided upstream of the relay 12b opposite to one end, so that the phase of the AC power supply can be detected, but there is still a requirement that the power consumed in the standby mode should not exceed a predetermined electric power (for example, 1W ) constraints

Traditionally, the phase detector 14 includes multiple diodes and resistors, so it is difficult for this configuration to meet the desired power consumption constraints

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