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Disclosed is an energy management technique for dot-band printers that allows for efficient utilization of the power supply and provides a low cost method for implementing a print density control function.
English (United States)
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Power-Averaging Technique for Dot-Band Printers
Disclosed is an energy management technique for dot-band printers that
allows for efficient utilization of the power supply and provides a low cost method
for implementing a print density control function.
Power supplies for line printers that print successive "dot rows" must deliver
very high transient load currents over short time intervals. However, the average
current required from the supply is much less than the peak current. This
frequently results in inefficient use of the power supply since most of the internal
energy storage components (inductors and capacitors) must be sized for the
peak current instead of the average current.
The top, middle, and bottom dot rows of normal alpha-numerical text have a
much higher dot density than the intermediate dot rows. Thus, the current
required from the power supply is much higher for these dot rows. A power
supply that is current limited to the average load required over all dot rows will
run in a current limit mode during high density dot rows, allowing components
internal to the power supply to be sized only for the average load instead of the
peak. Output capacitors deliver the residual current to the load during these time
intervals. Since high density dot rows are always followed by low density dot
rows during normal alpha-numerical text printing, the capacitors only supply the
residual load current for a short time interval.