Power supply device with smoothing capacitor and falling voltage chopper circuit
US8976558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2012 |
| Grant date | Mar 10, 2015 |
| Priority date | — |
| Expiry date | May 17, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
According to one embodiment, a power supply device includes a rectifying circuit configured to rectify an alternating-current power supply, a first capacitor configured to smooth a voltage after rectification, and a falling voltage chopper circuit configured to supply electric power to a load. The first capacitor is set to a capacity in which a section where a voltage after smoothing drops to an output voltage to the load is provided in a rectified half period of the alternating-current power supply. The falling voltage chopper circuit includes at least one switching element configured to receive an input of the voltage after smoothing, operate in a section where the voltage after smoothing exceeds the output voltage, and pause in a section of the output voltage and a second capacitor provided on an output side and having a capacity larger than the capacity of the first capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.