Current-type GTO inverter with surge energy restoration
US4567555A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1984 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Jul 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M5/4505
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a current type GTO inverter, commutation surge voltage is inevitably generated from an inductive load whenever each GTO is turned off. The commutation surge voltage thus generated is once stored in a capacitor (C.sub.1) through a diode surge voltage rectifier (5) and then restored to the DC source terminals (3A, 3B) of the GTO bridge-connected inverter (3) through a pair of other GTOs (G.sub.7, G.sub.8) turned on during steady state intervals of inverter commutation. Magnetic energy stored in a reactor (Lr.sub.1, Lr.sub.2) in motor-driving operation is recharged to the capacitor (C.sub.1) through the diode surge voltage rectifier (5) after the GTOs (G.sub.7, G.sub.8) have been turned off; the motor kinetic energy stored in the capacitor (C.sub.1) through diodes (D.sub.8, D.sub.9) in motor-braking operation is regenerated to the AC source side of the inverter (3) through a pair of other GTOs (G.sub.9, G.sub.10) when the voltage across the capacitor (C.sub.1) exceeds a predetermined value, and magnetic energy stored in the reactor (Lr.sub.1, Lr.sub.2) in motor-braking operation is recharged to the capacitor (C.sub.1) through diodes (D.sub.12, D.sub.13) after the GTOs (G.sub.9, G.s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.