Fully immersed magnetic transformer with multiple condensing surfaces and method
US6384703B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2000 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Dec 11, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J50/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sealed transformer for use in charging the batteries of an electric automobile includes a housing that contains the secondary windings, a core and a dielectric fluid. A removable primary winding coupler is inserted into the housing to complete a magnetic circuit. During operation of the magnetic circuit, heat is continuously generated by the primary and secondary windings and the core. The fluid undergoes a first phase change and boils as it absorbs the generated heat. The boiling fluid absorbs additional heat and undergoes a second phase change is it turns into a vapor. The heat of vaporization is released into thin windows formed in the transformer housing when the vapors contact the relatively cooler windows and re-condense into a liquid. A continuous cycle of boiling, vaporizing, and condensing occurs during operation of the transformer to cool the transformer and to improve the power density of the transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.