Current-limit circuit in X-ray generator

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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361 93, 363 56, 378110, H02H 7122

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active

046547703

ABSTRACT:
Current limit protection is provided to ensure that the current flow within the transistor inverter does not exceed a predetermined safe level to thereby cause damage to the various components such as the transistor inverters. The current in the primary of the transformer is sensed and a representative signal is compared with a reference signal to provide a digital output indicating whether a safe limit has been exceeded. A logic network then operates on the output signal to shut down or reduce the system operation accordingly. In the event of a shut-down, current decay is accommodated by shutting off only the top transistors in the inverter diagonals so as to thereby allow the remaining current to flow in the bottom transistors and diodes.

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patent: 4375105 (1983-02-01), Baumann
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Walter Weigl, "A New High-Frequency Controlled X-Ray Generator System with Multi-Pulse Wave Shape", Jun. 1983, pp. 7-19 in The Journal for Radiological Engineering, vol. 1, No. 1, Jun. 1983.

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