Device for the power supply of a non-linear load, especially a magnetron of a microwave oven
First Claim
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1. 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; and
a 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.
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Abstract
A power supply device for a non-linear load, especially a magnetron for microwave ovens, includes a resonant transformer. Using a fuzzy logic management unit, a level of a low voltage signal on the primary side of the transformer, a level of high voltage signal on the secondary side of the transformer, and a signal corresponding to the ambient temperature of the transformer are taken into account for the generation of a parameter for a control signal for controlling a switch positioned at the primary winding of the transformer. The power supply device makes it possible to reduce the size of the resonant transformer.
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Citations
30 Claims
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1. A power supply device for a non-linear load comprising:
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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; and a fuzzy logic management unit comprising a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A power supply device for a non-linear load comprising:
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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; a high voltage sensor for providing a measurement signal corresponding to a level of the high supply voltage; a low voltage sensor for providing a measurement signal corresponding to a level of the low supply voltage; a temperature measurement sensor for providing an ambient temperature measurement signal corresponding to an ambient temperature of said resonant transformer; and a fuzzy logic management unit comprising a 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. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A microwave oven comprising:
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a magnetron; and a power supply, said power supply comprising a resonant transformer comprising a primary winding and a secondary winding, said magnetron connected to the 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, a high voltage sensor for providing a measurement signal corresponding to a level of the high supply voltage, a low voltage sensor for providing a measurement signal corresponding to a level of the low supply voltage, a temperature measurement sensor for providing an ambient temperature measurement signal corresponding to an ambient temperature of said resonant transformer, and a fuzzy logic management unit comprising a 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. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for providing power to a non-linear load, the method comprising the steps of:
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providing a low supply voltage; receiving at a primary winding of a resonant transformer the low supply voltage and converting the low supply voltage into a high supply voltage present at a secondary winding of the resonant transformer, the non-linear load being connected to the secondary winding; controlling a transfer of electromagnetic energy from the primary winding to the secondary winding with a controlled switch connected between a low supply voltage source and the primary winding of the resonant transformer; generating a measurement signal corresponding to a level of the high supply voltage; generating a measurement signal corresponding to a level of the low supply voltage; generating a measurement signal corresponding to an ambient temperature of the resonant transformer; receiving as input variables the high supply voltage measurement signal, the low supply voltage measurement signal, and the ambient temperature measurement signal; providing as an output variable a value of a control signal parameter of a control signal for controlling the controlled switch; and generating the control signal parameter responsive to the received measurement signals. - View Dependent Claims (27, 28, 29, 30)
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Specification