Patent ID: 7356276
Filing Date: 2008-04-08
Classification: G03G

Abstract:
1. A high voltage generator for applying high voltages to a plurality of rollers included in an image forming apparatus and sensing resistance values of the rollers, the high voltage generator comprising: a plurality of voltage-pumping circuit units for providing high voltages to the respective rollers; a plurality of high voltage divide circuit units for dividing the high voltages output from the respective voltage-pumping circuit units; a multiplexer for receiving a plurality of divide signals output from the high voltage divide circuit units, and for selecting and outputting a divide signal which corresponds to a resistance of a roller to be sensed, based on a predetermined select signal; and a roller resistance sensing circuit unit for resetting the selected divide signal received from the multiplexer to meet an input voltage range of an analog-to-digital converter and outputting the reset signal, said roller resistance sensing circuit unit being commonly used to sense the resistance values of the plurality of rollers.