Control method for pulse tube cryocooler
AssigneePraxair Technology, Inc.
InventorBryce Mark Rampersad
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Abstract
Method of controlling a pulse tube cryocooler in which the power input to the acoustic source is varied to maintain temperature of a refrigeration load or a temperature that is at least referable to the temperature of the refrigeration load, at a set point temperature. Additionally, the impedance of an inertance network of the pulse tube cryocooler is also adjusted to obtain a maximum cooling power to the refrigeration load at the particular temperature as sensed and the particular power that is being supplied to the acoustic source.
Claims8
A method of controlling a pulse tube cryocooler to maintain a refrigeration load at a set point temperature or to move a refrigeration load towards the set point temperature, said method comprising:
- sensing a temperature referable to refrigeration load temperature of the refrigeration load;
- controlling power input to an acoustic source of the pulse tube cryocooler by increasing the power input when the temperature rises above the set point temperature and reducing the power input when the temperature falls below the set point temperature;
- and
- adjusting impedance of an inertance network of the pulse tube cryocooler to obtain a maximum cooling power to the refrigeration load from the pulse tube cryocooler at the temperature referable to the refrigeration load temperature and at the power input to the acoustic source.
Dependencies are inferred from the claim text.