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A study on the characteristic of high voltage type instantaneous current source for laser printer

In this paper, a new self-oscillated type HVPS (high voltage power supply) to charge the OPC (organic photo conductor) drum in laser printer is proposed, which has variable constant current source characteristics to improve the charge characteristic of the OPC drum. The proposed control method enables high quality printing characteristics regardless of the circumstance change such as ambient temperature or humidity by changing the current reference signal. To verify the proposed control method various experiments are performed.