Heating apparatus
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United States of America Patent
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Jul 19, 1988
Issued Date -
N/A
app pub date -
Sep 18, 1987
filing date -
Sep 11, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A heating unit includes two tubular tungsten-halogen lamps, each having a tungsten filament. The lamps are supported within a ring of ceramic fibre material and the unit is preferably mounted beneath an infra-red-transmissive cooktop to define a hotplate area of a cooking hob. A control circuit provides a range of discrete power outputs of the lamps, each power output corresponding to a power control setting set by a user of the cooking hob. The circuit includes a phase control circuit for switching power to the lamps at a predetermined phase angle to achieve one or more of the lower power outputs.
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