The
fixing system for the toner in copy machines, laser printers, facsimile
machines, data recorders, and scanners needs transfer of toner from the rolling
drum to the printing paper with heat and pressure. Radiant heating with halogen
lamps was used for this process in the past. However, nearly 90 percent of the
printing energy is consumed by this operation. The efficiency can be improved
by using the induction heating approach leading to reduction of the size of the
printing devices. The induction heating coil is installed concentrically inside
the fixing roller. The high frequency inverter required to feed the inductive
energy into the heating coil is built using IGBTs. The actual high efficiency
of more than 94 percent of the series resonant ZCS-PDM high frequency inverter
for IH roller in copy and printing machines has been observed for all the
output AC power regulation ranges from 50 to 1200 W.
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