High frequency power supply microwave oven
First Claim
1. In combination:
- a microwave oven supplied with microwave energy from a magnetron;
a power supply for said magnetron comprising a transformer having a primary winding supplied with pulses of current from a source at a substantially constant superaudible repetition rate;
a nonsaturating transformer having a magnetic core continuously flux biased in one direction with means for controlling the intensity of said current pulses comprising means for varying the average flux density in said core, said pulses of current being supplied to said primary winding when said magnetron is non-conductive to store energy in said core and cessation of each of said pulses producing a voltage in a secondary winding for supplying current to said magnetron.
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Accused Products
Abstract
A microwave oven having a magnetron wave energy supply energized by high voltage pulses at a superaudible frequency wherein the voltage pulses are produced by a decreasing portion of a magnetic flux cycle of said frequency in a transformer added to a voltage on a capacitance whose charge is replenished during a portion of said cycle during which a semiconductor switch connects a winding of the transformer to a source of unidirectional voltage to increase the flux in the transformer thereby energizing the magnetron with voltage pulses from a supply having a substantially constant current characteristic and permitting variation of the constant current level by variation of the average flux density in the transformer.
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Citations
10 Claims
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1. In combination:
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a microwave oven supplied with microwave energy from a magnetron; a power supply for said magnetron comprising a transformer having a primary winding supplied with pulses of current from a source at a substantially constant superaudible repetition rate; a nonsaturating transformer having a magnetic core continuously flux biased in one direction with means for controlling the intensity of said current pulses comprising means for varying the average flux density in said core, said pulses of current being supplied to said primary winding when said magnetron is non-conductive to store energy in said core and cessation of each of said pulses producing a voltage in a secondary winding for supplying current to said magnetron. - View Dependent Claims (2, 3, 4, 5)
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6. A microwave oven comprising:
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a magnetron having its output coupled to the interior of said oven and its input supplied from a high voltage winding of a nonsaturating transformer having a core continuously flux biased in one direction; an input to said transformer comprising a primary winding connected to a source of power through a semiconductor switch which energizes said primary winding with pulses of current at a substantially constant superaudible pulse repetition rate; means for closing said switch to increase the flux energy stored in said transformer core to a predetermined value while charging a condenser through said high voltage winding and for opening said switch to deliver power to said magnetron from said condenser and said flux energy through said high voltage winding; and means for controlling the power supplied to said magnetron comprising means for varying the average density of said flux in said transformer. - View Dependent Claims (7, 8, 9, 10)
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Specification