Electronic microwave oven power supply

An operating system combined with a magnetron, said system comprising:

• a source means operative to provide a first output of relatively low magnitude unidirectional voltage,
• an inverter means operative to receive said first output and to provide a second output of relatively low-magnitude high-frequency AC voltage,
• a first transformer means operative to receive said second output and to provide a third output of relatively high-magnitude high-frequency AC voltage, said transformer means comprising a primary winding adapted to receive said second output and a secondary winding adapted to provide said third output, there being substantial magnetic flux leakage between said primary winding and said secondary winding, said flux leakage being operatibe to provide a manifest limitation on the magnitude of the current that can flow from said third output,
• a high-frequency rectifying means operative to receive said third output and to provide a fourth output of relatively high-magnitude unidirectional voltage, and
• means connecting said fourth output to the magnetron for energization thereof.

An operating system combined with a magnetron, said system comprising:

• a source means operative to provide a first output of relatively low-magnitude unidirectional voltage,
• a self-oscillating inverter means operative to receive said first output and to provide a second output of relatively low-magnitude high-frequency AC voltage, said inverter means comprising an electrically actuatable inverter control means operable to directly control the inverter's mode of inversion, thereby to control said second output,
• a first transformer means operative to receive said second output and to provide a third output of relatively high-magnitude high-frequency AC voltage,
• a high-frequency rectifying means operative to receive said third output and to provide a fourth output of relatively high-magnitude unidirectional voltage, and
• means connecting said fourth output to the magnetron for energization thereof.

An operating system combined with a magnetron, said system comprising:

• a source means operative to provide a first output of relatively low-magnitude unidirectional voltage,
• an inverter means operative to receive said first output of relatively low-magnitude unidirectional voltage and to provide a second output of relatively low-magnitude high-frequency AC voltage,
• a transformer means operative to receive said second output and to provide a third output of relatively high-magnitude high-frequency AC voltage, said third output being characterized as having a substantially inductive internal impedance,
• a capacitor means being connected in parallel circuit directly across said third output and operative to resonantly interact with said inductive internal impedance at the fundamental frequency of said AC voltage,
• a high-frequency rectifying means operative to receive said third output and to provide a fourth output of relatively high-magnitude unidirectional voltage, and
• means connecting said fourth output to the magnetron for energization thereof.

An operating system combined with a magnetron, said system comprising:

• a source means operative to provide a first output of relatively low-magnitude substantially constant unidirectional voltage,
• an inverter means operative to receive said first output and to provide a second output of relatively low-magnitude high-frequency AC voltage,
• a transformer means operative to receive said second output and to provide a third output of relatively high-magnitude high-frequency AC voltage,
• a high-frequency rectifying means operative to receive said third output and to provide a fourth output of relatively high-magnitude substantially ripple-free unidirectional voltage, and
• means connecting said fourth output to the magnetron for energization thereof.

An operating system combined with a magnetron, said system comprising:

• a source means operative to provide a first output of relatively low-magnitude unidirectional voltage,
• an inverter means operative to receive said first output and to provide a second output of relatively low-magnitude high-frequency AC voltage,
• a transformer means operative to receive said second output and to provide a third output of relatively high-magnitude high-frequency AC voltage, said third output being characterized by having a substantially inductive output impedance,
• a capacitor means connected in parallel circuit directly across said third output, said capacitor means being operable to series-resonantly interact with said inductive output impedance at the fundamental frequency of said AC voltage, thereby causing the magnitude of said relatively high-magnitude high-frequency AC voltage to be substantially larger than it would have been without such series-resonance effect,
• a high-frequency rectifying means connected in parallel-circuit with said capacitor means and operative to provide a fourth output of relatively high-magnitude unidirectional voltage, and
• means connecting said fourth output to the magnetron for energization thereof.

An operating system combined with a magnetron, said system comprising:

• rectifier means connected with the relatively low frequency voltage of an ordinary electric utility power line and operative to provide an output of relatively low-magnitude unidirectional voltage;
• inverter means operative to receive said output of relatively low-magnitude unidirectional voltage and to provide an output of relatively low-magnitude high-frequency AC voltage, said AC voltage being of a frequency substantially higher than that of the voltage on said power line;
• transformer means operative to receive said output of relatively low-magnitude high-frequency AC voltage and to provide an output across a pair of output terminals of relatively high-magnitude high-frequency AC voltage, said transformer means comprising inductance means operative to make said output of relatively high-magnitude high-frequency AC voltage exhibit a predominantly inductive output impedance;
• capacitor means connected across said pair of output terminals and operative to resonantly interact with said inductive output impedance, thereby forming a resonant circuit;
• and
• high-frequency rectifier and load means effectively connected in parallel circuit with said capacitor means and operative to provide a relatively high-magnitude DC voltage for energizing said magnetron;
• whereby said resonant circuit is series-excited and parallel-loaded.

A power supply combined with a magnetron, comprising:

• voltage transformation means connected with the relatively low-magnitude low-frequency voltage of an ordinary electric power line and operative to provide an output of relatively high-magnitude high-frequency voltage, the frequency of this high-frequency voltage being substantially higher than that of said low-frequency voltage;
• rectifier and filter means connected with said output of high-magnitude high-frequency voltage and operative to provide an output of current-limited high-magnitude DC voltage, said DC voltage having substantially no voltage-ripple at frequencies equal to or higher than the frequency of said high-frequency voltage;
• and
• connect means connecting said output of high-magnitude DC voltage to said magnetron for the effective operation thereof.