Patent · US Expired

X-ray diagnostic generator

US4238681A · kind A · utility

1Cited by

2References

2Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Johann Seissl · Erlangen, DE
Karlheinz Broenner · Erlangen, DE
Hartmut Krause · Erlangen, DE

Key dates

Filing date	Sep 28, 1979
Grant date	Dec 9, 1980
Priority date	—
Expiry date	Sep 28, 1999

Classification

Technology area (CPC H)Electricity
CPC primaryH05G1/14
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

In an exemplary embodiment, a bridge rectifier is coupled with the primary circuit of the high voltage transformer. In the d.c. current branch of the bridge rectifier, a smoothing capacitor and a thyristor are arranged. The thyristor is turned on and off with a pulse duty cycle which determines the capacitor voltage and hence the x-ray tube voltage. At the thyristor, an LC-oscillatory circuit is connected whose capacitance when the thyristor is conductive, is discharged via the latter and which effects the extinction of the thyristor via a free-running diode which is conductive in return oscillation phase and which is disposed parallel to the thyristor. In this manner, a high switching frequency of the thyristor and hence a minimal ripple of the x-ray tube voltage can be achieved.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.