Radiant energy – With charged particle beam deflection or focussing – With target means
Patent
1979-04-04
1981-03-31
Smith, Alfred E.
Radiant energy
With charged particle beam deflection or focussing
With target means
250401, 363 58, 363136, 361 58, H05G 100
Patent
active
042595819
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 detection of a short circuit or overload.
REFERENCES:
patent: 3294299 (1968-07-01), Lawn et al.
patent: 3428809 (1969-02-01), Daniels et al.
Csontos Peter
Henter Laszlo
Kalman Laszlo
Kondor Tibor
Wein Istvan
Medicor Muvek
O'Hare Thomas P.
Ross Karl F.
Smith Alfred E.
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