Regulated power supply circuit for a heating magnetron

Claim 2

An operating circuit for energizing a heating magnetron from an alternating voltage electric utility service which comprises: a non-saturating, fixed-reactance in series with the discharge circuit of said magnetron said reactance having a magnitude such that for normal variations in the voltage of said electric utility service said reactance both limits the plate current of said magnetron to a value below said magnetron''s maximum allowable plate current and maintains said plate current substantially constant.

Claim 3

In an operating circuit according to claim 1, wherein said fixed-reactance is an inductance whose inductive reactance has a magnitude equal to at least one half of said magnetron''s mean operating resistance.

Claim 4

An operating circuit according to claim 1, wherein said fixed-reactance is the capacitive reactance of a fixed capacitor.

Claim 5

An operating circuit according to claim 3, wherein said capacitive reactance has a magnitude equal to at least one half of said magnetron''s mean operating resistance.

Claim 6

An operating circuit for energizing a heating magnetron from an alternating voltage electric utility service which comprises: a non-saturating, fixed-reactance in series with the discharge circuit of said magnetron to regulate said magnetron''s power output over normal variations in the voltage of said electric utility service, and where the value of the resultant impedance of said magnetron-fixed reactance series circuit is such that a .+-. 10% change in said utility service''s mean output voltage, appearing across said series circuit, results in less than .+-. 20% wattage change in the mean power output of said magnetron.

Claim 7

An operating circuit for energizing a heating magnetron from an alternating voltage electric utility service which comprises: a non-saturating, fixed-reactance in series with the discharge circuit of said magnetron to regulate said magnetron''s power output over normal variations in the voltage of said electric utility service, and where the value of the resultant impedance of said magnetron-fixed reactance series circuit is such that a .+-. 10% change in said utility service''s mean output voltage, appearing across said series circuit, results in less than .+-. 20% wattage change in the mean power output of said magnetron.

Claim 8

An operating circuit, according to claim 5, which includes: a transformer whose primary is connected across said alternating electric utility service and whose secondary is connected across said fixed reactance-magnetron series discharge circuit.

Claim 9

In an improved operating and regulating first circuit for energizing a heating magnetron which includes a magnetron plate transformer with a primary and a secondary winding, means to connect said transformer primary winding to an alternating voltage electric utility service, a magnetron, means to connect said transformer''s secondary winding to said magnetron, means connected to said first circuit for limiting the plate current of said magnetron to a value below said magnetron''s maximum allowable plate current for maintaining said plate current at a substantially constant current over normal variations in the voltage of said electric utility service, and an improved second regulating circuit, said improved second regulating circuit comprises in combination: non-saturating fixed reactance in series with the secondary winding of said transformer and the discharge circuit of said magnetron where the value of the resultant impedance of said magnetron-fixed reactance series circuit is such that a .+-. 10% voltage change in said utility service''s mean output voltage will result in less than a .+-. 10% wattage change in the mean power output of said magnetron.

Claim 10

In an improved operating and regulating first circuit for energizing a heating magnetron which includes a magnetron plate transformer with a primary and a secondary winding, means to connect said transformer primary winding to an alternating voltage electric utility service, a magnetron, means to connect said transformer''s secondary winding to said magnetron, means connected to said first circuit for limiting the plate current of said magnetron to a value below said magnetron''s maximum allowable plate current for maintaining said plate current at a substantially constant current over normal variations in the voltage of said electric utility service, and an improved second regulating circuit, said improved second regulating circuit comprises in combination: non-saturating fixed reactance in series with the secondary winding of said transformer and the discharge circuit of said magnetron where the value of the resultant impedance of said magnetron-fixed reactance series circuit is such that a .+-. 10% voltage change in said utility service''s mean output voltage will result in less than a .+-. 10% wattage change in the mean power output of said magnetron.

Claim 11

An operating circuit according to claim 7, wherein said fixed-reactance is the capacitive reactance of a fixed capacitor, rectifier means across said magnetron which permits said capacitor to charge and discharge during alternating voltage variations of said utility service, and where said capacitive reactance is chosen to resonate with the inductive reactance of said transformer.

Claim 12

In an operating circuit according to claim 7, wherein said first circuit means for maintaining the plate current substantially constant is a saturable reactance.