DC converters with constant and variable duty ratio switching
US7952892B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2007 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Aug 21, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/335
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A DC converter comprises a half bridge supply circuit and one or more flyback or forward converter output circuits, and optionally also an LLC converter whose control can determine a common variable switching frequency. The half bridge supply circuit produces a 50% duty output alternating between two input voltages, such as zero and a voltage Vin. In each flyback or forward converter output circuit, a switch connects a transformer primary to the half bridge supply circuit output in a PWM controlled manner to regulate a respective flyback or forward converter DC output which is produced by the converter output circuit, with a duty ratio less than 50% whereby switching losses are reduced. Soft switching is further facilitated by the half bridge supply circuit having two transistors controlled in a complementary manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.