Patent ID: 6049071
Filing Date: 2000-04-11
Classification: H05B,Y02B

Abstract:
A power supply device for a non-linear load comprising:a resonant transformer comprising a primary winding and a secondary winding;a controlled switch connected between a low supply voltage and the primary winding for controlling a high supply voltage at the secondary winding;high voltage measurement means for providing a measurement signal corresponding to a level of the high supply voltage;low voltage measurement means for providing a measurement signal corresponding to a level of the low supply voltage;temperature measurement means for providing an ambient temperature measurement signal corresponding to an ambient temperature of said resonant transformer; anda fuzzy logic management unit comprisinga plurality of inputs for receiving the high supply voltage measurement signal, the low supply voltage measurement signal, and the ambient temperature measurement signal as input variables, and an output for providing as an output variable a value of a control signal parameter for controlling said controlled switch based upon a fuzzy logic algorithm comprising a first set of rules of consistency for enabling an increase in the control signal parameter when the low supply voltage decreases and for enabling a decrease in the control signal parameter when the low supply voltage increases, and a second set of rules of consistency for enabling the control signal parameter to be reduced when the ambient temperature increases, and for enabling the control signal parameter to be increased when the ambient temperature decreases.