Neutral-point inverter
US6281636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1998 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Dec 21, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A commercial power supply is connected to a rectifier DB through a low-pass filter LPF. A smoothing capacitor Cs, a series circuit consisting of voltage-dividing capacitors C1 and C2, and a series circuit consisting of switching elements Q1 and Q2 are connected in parallel to the output of the rectifier DB. Diodes D1 and D2 are connected in reverse parallel to the switching elements Q1 and Q2, respectively. A drive circuit DR is connected to the switching elements Q1 and Q2. Between a connecting point that is between the voltage-dividing capacitors C1 and C2 and a connecting point that is between the switching elements Q1 and Q2, a load circuit R consisting of a parallel circuit is connected. The parallel circuit includes an inductor Lo, a fluorescent lamp LT, and a resonance capacitor C4. By turning the switching elements Q1 and Q2 on and off, the inductor Lo is caused to perform a step-up inverter operation, whereby stable high-frequency voltage with a high voltage is generated across both ends of the inductor Lo. As a result, a neutral point inverter capable of generating high-frequency voltage that has a high voltage and less "undulation" can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.