Method and a device for regulating the electrical power supply to a magnetron, and an installation for treating thermoplastic containers being an application thereof
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United States of America Patent
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Sep 10, 2013
Grant Date -
May 1, 2008
app pub date -
Oct 22, 2007
filing date -
Oct 25, 2006
priority date (Note) -
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Abstract
The electrical power supply to a magnetron (M) is regulated as a function of an instantaneous microwave power setpoint by: predetermining and storing (20) a value (η) for the electrical efficiency of the magnetron; inputting (19) a setpoint mean microwave power value, and converting it into a low frequency setpoint instantaneous power signal that is sampled at high frequency; measuring (8, 9) and sampling the instantaneous values of anode current and of the high voltage fed to the magnetron; calculating (10) the difference at a sampling instant (n) between the setpoint instantaneous microwave power and the product of the current multiplied by the high voltage multiplied by the efficiency; determining an instantaneous microwave power value at the consecutive sampling instant (n+1) that is corrected as a function of a predetermined regulation relationship that is valid at said instant (n+1); and converting it into an analog signal representative of the corrected instantaneous microwave power for powering the magnetron.
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