Power supply circuit for a printer

Details Power supply circuit for a printer Power supply circuit for a printer

1997-03-21

1998-09-29

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

399176, G05F 140, G03G 1516

Patent

active

058149783

ABSTRACT:
A power supply for use in a printer provides a current progressively small with increasing transfer roller impedance. A reference current section RC sets a voltage Vr indicative of a reference current Ia of an output current Iout of the power supply PS. A voltage generator VG provides an output voltage Vout of the power supply PS. A voltage monitor VM monitors the output voltage to provide a voltage-monitoring signal Vm to an operational section E. The operational section E determines a correction value of the output current Iout on the basis of the voltage Vr and the voltage-monitoring signal Vm. The correction value is progressively small as the voltage-monitoring signal Vm increases. A current controller C controls the voltage generator VG in accordance with an operation result obtained by the operational section E, so that the transfer roller is supplied with a current progressively small with increasing roller impedance but is still charged to a voltage progressively high with increasing roller impedance.

REFERENCES:
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patent: 5682575 (1997-10-01), Komori
patent: 5684685 (1997-11-01), Komatsu et al.
patent: 5705919 (1998-01-01), Wilcox

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