FLYBACK TRANSFORMER APPARATUS

• US 3,866,086 A
• Filed: 06/11/1973
• Issued: 02/11/1975
• Est. Priority Date: 06/28/1972
• Status: Expired due to Term

• Current Assignee: Keisuke Miyoshi, Naoki Shibano
• Original Assignee: Keisuke Miyoshi, Naoki Shibano
• Inventors: Miyoshi, Keisuke, Shibano, Naoki
• Primary Examiner(s): Wilbur, Maynard R.
• Assistant Examiner(s): Potenza, J. M.
• Application Number:
  US05/369,001
• Time in Patent Office: 610 Days
• Field of Search: 336/94,198,57 315/27TD,27XY,28-29
• US Class Current: 315/411
• CPC Class Codes: H01F 2027/408 Association with diode or rectifier
• CPC Class Codes: H01F 38/42 Flyback transformers
• CPC Class Codes: H04N 3/18 Generation of supply voltages, in combination with electron beam deflecting
• CPC Class Codes: H04N 3/19 Arrangements or assemblies in supply circuits for the purpose of withstanding high voltages

Abstract

A flyback transformer apparatus is provided in which a flyback transformer is provided with a first and second secondary winding with one end of the first secondary winding connected to at least one first rectifier and a second rectifier connected between one end of the second secondary winding and the other end of the first secondary winding, a capacitor is connected to the second secondary winding, and a primary winding of the flyback transformer is inductively coupled with the high-voltage side winding portion of the first secondary winding, whereby the output impedance is reduced and a focusing voltage which does not give rise to defocusing is provided.

Claims

1. A flyback transformer apparatus comprising:

a flyback transformer having a primary winding, a first secondary winding and a second secondary winding;

at least one first rectifier connected to one end of said first secondary winding;

a second rectifier connected between one end of said second secondary winding and the other end of said first secondary winding; and

a capacitor connected to said second rectifier in such a manner that said capacitor is charged up by a voltage produced across said second rectifier, wherein the entire primary winding of said flyback transformer is inductively closely coupled with the hightension side winding portion of said first secondary winding.

2. A flyback transformer apparatus according to claim 1, wherein said first rectifier is provided with a terminal from which a high D.C. voltage is taken, and said second rectifier is provided with a terminal from which a moderately high D.C. voltage is taken.

3. A flyback transformer apparatus according to claim 1, wherein said primary winding and said first secondary winding are wound on one of two legs of a core, and said second secondary winding is wound on the other leg of said core.

4. A flyback transformer apparatus according to claim 1, wherein said flyback transformer having said primary winding and said two secondary windings, said first and second rectifiers, and said capacitor are housed in a hermetically sealed case, and an insulating oil is filled in said case.

5. A flyback transformer apparatus according to claim 4, wherein said primary winding and said first secondary winding are wound respectively on two bobbins concentrically mounted on said core, and an insulating separator is provided between said bobbins.

6. A flyback transformer apparatus according to claim 1, further comprising a core having a first and second bobbin provided concentrically thereon, said primary winding wound on said first bobbin, said first secondary winding wound on said second bobbin, and said primary winding wound only on that portion of said first bobbin facing the high-tension winding portion of said first secondary winding.

7. A flyback transformer apparatus according to claim 1, wherein a dummy load is connected between the junction point of said second rectifier and said first secondary winding and the ground.