Patent ID: 6072703
Filing Date: 2000-06-06
Classification: G03G

Abstract:
A power supplying apparatus for use in an electrophotographic apparatus, comprising:a switching device configured to output an output current when a prescribed pulse of an input current is applied thereto;a switching control device configured to control an output operation of said switching device by generating said prescribed pulse, said prescribed pulse having a prescribed width and a prescribed duty cycle, and applying said prescribed pulse to said switching device;a transformer with a primary winding connected with said switching device, and which generates a prescribed output voltage at a secondary winding by stepping-up an input voltage induced at said primary winding;a rectifying-smoothing device connected with said secondary winding of the transformer configured to rectify and smooth an output current induced by said transformer;a parallel resistance connected in parallel with said secondary winding of the transformer by said rectifying-smoothing device;an output terminal with a first side connected with a higher potential terminal of said parallel resistance and a second side connected with a process device of said electrophotographic apparatus grounded;wherein said switching control device controls said switching operation such that a prescribed amount of constant current flows through said process device in a first mode, and no current flows through said process device and a prescribed voltage is induced at said output terminal in a second mode.