Direct current power converter with start-up and protection circuits
US4063307A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Jun 28, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/33507
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A D.C. to D.C. converter including a start circuit having a choke with a primary winding and a start winding. A portion of the input power is fed through a section of the start winding to the base of a switching transistor connected in series with the primary winding. The transistor is operated as a blocking oscillator by the start circuit and a voltage is induced across a secondary winding of the choke. The secondary voltage is rectified and fed to the control input of a pulse width modulator. In response to a predetermined level of the secondary voltage, the output of the pulse width modulator is coupled to the base of the transistor and the start circuit disabled. Current overload and transient voltage protection circuits are also included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.