Stabilized power supplies

• US 4,019,122 A
• Filed: 08/07/1975
• Issued: 04/19/1977
• Est. Priority Date: 08/14/1974
• Status: Expired due to Term

• Current Assignee: Telcon-Magnetic Cores Limited
• Original Assignee: Telcon-Magnetic Cores Limited
• Inventors: Ryan, Kenneth Augustine
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/602,511
• Time in Patent Office: 621 Days
• Field of Search: 323/6, 323/44 R, 323/48, 323/60, 323/61, 336/165, 336/178, 336/184, 336/212, 336/215
• US Class Current: 323/307
• CPC Class Codes: G05F 3/06 using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit

Abstract

A constant-voltage transformer for stabilized power supply includes a primary coil and a secondary coil connected across a tuning capacitor. A magnetically continuous magnetic core links both the primary coil and the secondary coil, and a magnetically discontinuous magnetic core links the secondary coil but not the primary coil. Another discontinuous magnetic core may link the primary coil but not the secondary coil, and a compensating coil may be linked by this core only. Preferred designs have an abrupt cut-off at a load current only a little greater than design value, so that a dangerously high current can never be drawn, even into a total short circuit.

Claims

1. A constant-voltage transformer comprising a primary coil, a secondary coil, a tuning capacitor connected across said secondary coil, a magnetically continuous magnetic core linking both said primary coil and said secondary coil, a magnetically discontinuous magnetic core linking said secondary coil but not said primary coil and another discontinuous magnetic core linking said primary coil but not said secondary coil.

2. A constant-voltage transformer comprising a primary coil, a secondary coil, a tuning capacitor connected across said secondary coil, a magnetically continuous magnetic core linking both said primary coil and said secondary coil, a first magnetically discontinuous magnetic core linking said secondary coil but not said primary coil, and a second discontinuous magnetic core linking said primary coil but not said secondary coil, each said magnetic core being formed of curved laminations of grain-oriented material.

3. A constant-voltage transformer as claimed in claim 2 in which said continuous core is a C-type core with its parts closely butted and each of said first and second discontinuous cores is a C-type core with its parts butted on a spacer.

4. A constant-voltage transformer as claimed in claim 2 in which each said discontinuous core is spaced from said continuous core.

5. A constant-voltage transformer as claimed in claim 2 in which said primary and secondary coils are located on opposite legs of said continuous magnetic core.

6. A constant-voltage transformer as claimed in claim 2 in which each said discontinuous magnetic core is located outside said continuous magnetic core.

7. A constant-voltage transformer as claimed in claim 2 in which all of said magnetic cores are coplanar.

8. A constant-voltage transformer comprising a primary coil, a secondary coil, a tuning capacitor connected across said secondary coil, a magnetically continuous magnetic core linking both said primary coil and said secondary coil, a first magnetically discontinuous magnetic core linking said secondary coil but not said primary coil, a second discontinuous magnetic core linking said primary coil but not said secondary coil, and a compensating coil linked by said second discontinuous magnetic core only and connected in series with at least part of the secondary coil.

9. A constant-voltage transformer as claimed in claim 8 in which all of said magnetic cores are formed of curved laminations of grain-oriented material.

10. A constant-voltage transformer as claimed in claim 9 in which said continuous core is a C-type core with its parts closely butted and each discontinuous core is a C-type core with its parts butted on a spacer.