Variable leakage transformer
US4327348A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1979 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Oct 3, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2029/143
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable leakage transformer or a variable voltage transformer comprising a magnetic core with a main-magnetic path and a sub-magnetic path, the main magnetic path having at least a common magnetic path with the submagnetic path, a primary winding wound on said common magnetic path of the core, a secondary winding wound on said main magnetic path of the core, means for controlling the magnetic flux in said sub-magnetic path, and said main-magnetic path having a thin air gap. By controlling the magnetic flux in the sub-magnetic path, the leakage of the flux induced by the primary winding from the main-magnetic path to the sub-magnetic path can be controlled. Thus the coupling between the primary and secondary windings, and conduction period in each cycle of the AC output voltage are controlled. The control of the conduction period in each cycle provides the control of the power transmitted from the primary winding to the secondary winding. Because of the presence of the air gap provided in the main-magnetic path, excellent control of the output voltage is obtained even when a load is small.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.