Induction Heating Light Bulbs
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Objective To heat two 0.5″ getters to a red glow inside a light bulb in
order to fire the getters within 8 seconds. Presently the bulbs
are lowered onto an eight station turnstile with an index time of
8 seconds.
Material Metal Halide Lamp containing two 0.5″ diameter getters of
unknown composition.
Temperature 1300ºF to 1500ºF
Frequency 350 kHz
Equipment Power of 6 kW solid state induction power supply including one remote heat station containing one (1) capacitor totaling 0.66 μF, and a unique coil comprised of four (4) parallel two (2) turn coils.
Process By using the UIHM 5 kW solid state induction power supply the following results were achieved:
Results • Both getters were fired within 2.5 seconds through the use of a unique helical coil comprising of four (4) parallel two (2) turn coils and the 4-20 mA fast ramp input.
• The 2.5 second firing cycle allows for the coil to be move around the part and away within the indexing time
of the turnstile table.
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