Buck-boost parallel resonant converter with inductive energy recovery circuit
US4709323A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1986 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Sep 29, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A DC-AC converter circuit for a power supply contains a parallel resonant circuit topology. Accordingly, stray capacitance associated with the converter forms a part of the resonant circuit and assists in setting the resonant frequency thereof. The energy in the stray capacitance which is normally lost is recovered by the resonant circuitry. A coupled inductor is connected in series with a primary winding of an output transformer of the converter. The coupled inductor includes a resonating inductor winding and an energy recovery winding which are tightly wound out of phase with one another. Energy from the resonant inductor winding is coupled to the recovery winding when the switching elements of the converter are switched on and off. Therefore, energy otherwise dissipated in switching operation is conserved by being returned to its source. Further, the switching elements of the converter are connected in series through diodes to the return line. Consequently the converter is capable of operating either in a buck or boost mode and to switch from one mode of operation to the other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.