Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1994-01-21
1995-05-23
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219494, 219501, 219505, 323237, H05B 102
Patent
active
054183510
ABSTRACT:
To eliminate pulsating current of vaporized gas by controlling a heater by means of a phase control, instead of controlling the heater by means of an on-off control which causes the vaporized gas to become a pulsating current, in a vaporized gas cooling apparatus using heater heating used in a thermal analysis apparatus and the like. By performing a phase control of the sine wave of the alternating power source by means of a thyristor and supplying power to the heater the duration of control at a time is reduced to as short as 10 msec (in case of 50 Hz). Accordingly, a filter effect is obtained by the fact that a changing speed of the heater temperature and a vaporization speed of coolant are too slow to follow the control action which prevents vaporized gas to become pulsating current. Since vaporized gas coming out is not a pulsating current, using this for cooling makes less fluctuation of temperature and makes the temperature more stable.
REFERENCES:
patent: 3735241 (1973-05-01), O'Sullivan
patent: 4260947 (1981-04-01), Massey
patent: 4311491 (1982-01-01), Bibbo et al.
patent: 4335293 (1982-06-01), Kobayashi et al.
patent: 4337509 (1982-06-01), Omae et al.
patent: 5120936 (1992-06-01), Shyu et al.
patent: 5216567 (1993-01-01), Kontanzer
Paschall Mark H.
Seiko Instruments Inc.
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