Magnetron drive step-up transformer and transformer of magnetron drive power supply

A magnetron drive step-up transformer comprising:

• a step-up transformer for supplying a drive voltage to a magnetron;
• and
• a switching circuit being connected to a primary side of said step-up transformer, wherein said step-up transformer includes:
• a main magnetic circuit for concentrically layer-winding a primary winding and a secondary winding of said step-up transformer;
• and
• a subordinate magnetic circuit for generating a leakage flux in at least a part between the primary winding and the secondary winding, wherein said main magnetic circuit and said subordinate magnetic circuit are formed by combining an E-shaped magnetic substance and an I-shaped magnetic substance opposed to each other.

A transformer of a magnetron drive power supply comprising:

• a step-up transformer for stepping up output of an inverter section, and
• a high-voltage circuit for voltage-doubler-rectifying output of said step-up transformer, wherein
• said step-up transformer includes;
• a primary winding and a secondary winding concentrically with a predetermined space provided between said primary winding placed outside and said secondary winding placed inside.

A magnetron drive step-up transformer comprising:

• a primary winding,
• a secondary winding being placed inside said primary winding with a predetermined gap therebetween, and
• a subordinate magnetic circuit for generating a leakage flux between said primary winding and said secondary winding, wherein
• said subordinate magnetic circuit includes;
• an E-shaped magnetic substance placed at one end outside said primary winding and said secondary winding, and placed at an opposite end between said primary winding and said secondary winding.

A magnetron drive step-up transformer unit comprising:

• a magnetron,
• a step-up transformer for supplying a drive voltage to said magnetron, and
• a switching circuit being connected to the primary side of said step-up transformer, wherein
• said step-up transformer includes;
• three types of windings of a primary winding, a secondary winding, and a heater winding,
• magnetic substances for transferring power of said switching circuit as a magnetic flux from said primary winding to another winding,
• an outer bobbin around which said primary winding is wound, and
• an inner bobbin around which said secondary winding and said heater winding are around, said inner bobbin being placed inside said outer bobbin, said windings being wound as concentric layers with respect to a magnetic circuit of the magnetic substance.

A magnetron drive step-up transformer unit comprising:

• a magnetron,
• a high-voltage circuit for supplying a high voltage to said magnetron,
• a step-up transformer for supplying a drive voltage to a heater of said magnetron and said high-voltage circuit,
• a switching circuit being connected to the primary side of said step-up transformer, and
• a printed circuit board on which said high-voltage circuit, said heater of said magnetron, and said switching circuit are print-wired for fixing said step-up transformer wherein
• a first winding, a second winding, and a third winding of said step-up transformer are wound as concentric layers around two or more bobbins with respect to a magnetic substance forming a magnetic circuit,
• said bobbins are provided at appropriate positions with terminal parts of said windings,
• one of said bobbins is provided with a terminal part of magnetic substance ground brought into contact with the magnetic substance,
• the terminal part of said first winding and the terminal parts of said second and third windings are placed so as to face each other with the magnetic substance between,
• said winding terminal parts of said step-up transformer are soldered and fixed to said printed circuit board, and
• said first winding is connected to said switching circuit, said second and third windings are connected to said high-voltage circuit and said heater of said magnetron, and the terminal part of the magnetic substance ground is connected to chassis ground.