High-power diagnostical X-ray equipment with thyristor converter
US4259581A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Apr 4, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An inverter for diagnostic X-ray equipment, comprising a thyristor bridge with an input diagonal connected in series with two commutating inductances across a DC power supply, is provided with a start-stop circuit which includes an ancillary thyristor connected in series with a diode and a current-limiting impedance across one of the bridge arms. On start-up, the ancillary thyristor is triggered simultaneously with the diagonally opposite bridge thyristor in order to connect the current-limiting impedance in series with the AC output diagonal of the bridge during the first half-period; for a quick cutoff, the ancillary thyristor and the associated bridge thyristor are turned on together whereby two previously charged quenching capacitors, one of them included in the start-stop circuit, are discharged through the commutating inductance in series with the associated bridge arm to terminate conduction in another bridge arm fed through the same commutating inductance. A protective unit connected across the input diagonal of the bridge includes a further capacitor, charged from an auxiliary voltage source, which reverse-biases the bridge thyristors by way of another thyristor fired upon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.