Pre-charge circuit for aux-comm inverter
US4146920A · kind A · utility
3Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Nov 10, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/517
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An input rectifier supplies d-c energy for an auxiliary-commutated inverter. A logic circuit provides gating signals for the semiconductor switches in the input rectifier circuit and in the inverter circuit. A pre-charge circuit provides an independent path to charge the commutating capacitor in the inverter when the system is energized. The gating signals to the input rectifier are delayed by a predetermined time interval, allowing the commutating capacitor in the inverter to be charged and thus ensure effective commutation when the inverter commences operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.