Heating Principle Of Ih Heater - Toshiba e-STUDIO453 Service Manual

13.4.2 Heating principle of IH Heater

The magnetic field is generated by applying a high frequency current to the IH coil inside the fuser
roller, which then generates the eddy current in it. When the eddy current flows, the Joule heat is gen-
erated by the resistance element of the fuser roller, which is then heated. In the IH coil method, the
thermal efficiency is higher than the lamp method because the fuser roller is directly heated.
Hgh frequency
power source
[ Block dagram of hgh frequency power supply ]
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B
A
IH col Hgh frequency
magnetc feld
[ Image of current flowng from A to B ]
Fig. 13-402
Smoothng crcut
C
D
T
Current nput
Montorng nput current
Montorng nput current
Fig. 13-403
13 - 5
Current flowng on the surface of the fuser roller
Eddy current Current flowng nsde the
fuser roller
Control crcut hgh frequency current
Fuser roller
IH col
( IGBT )
C2
Tr
IGBT
drve
CPU
Voltage
nput
I/F crcut on LGC board
e-STUDIO350/352/353/450/452/453
FUSER UNIT / PAPER EXIT SECTION
13