System and method for heater control for evaporation of cryogeni

Details System and method for heater control for evaporation of cryogeni System and method for heater control for evaporation of cryogeni

1997-09-11

1999-10-26

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219485, 219506, 219497, 219508, 374 11, 374 31, H05B 102

Patent

active

059732997

ABSTRACT:
A heater controller for allocating heaters to cool a thermal chamber of a scientific instrument evaporates cryogenic liquid to produce a coolant gas. The gas is injected into a chamber to cool a sample disposal therein. The controller allocates low-capacity heaters in compliance with IEC guidelines to prevent problems generally associated with switching of large current loads, such as heaters. In one embodiment, heaters are activated so as to avoid jump discontinuities by effectively averaging the power delivered by the heaters. A second embodiment reduces complexity by essentially disregarding the problem of the jump discontinuity. A third embodiment groups the heaters according to a binary grouping scheme. The heater controller of the present invention can be used to control temperature according to a user supplied temperature profile.

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J.G. Van-de-Velde et al., "A Novel Approach to Precision Controlled Cooling of a Differential Scanning Calorimeter," Thermochimica Acta, 214 (1993) 163-170.

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