X-ray diagnostic apparatus

Details X-ray diagnostic apparatus X-ray diagnostic apparatus

1987-04-17

1989-02-28

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Electronic circuit

X-ray source power supply

378109, 378112, H05G 134

Patent

active

048093114

ABSTRACT:
A pre-ignition type X-ray apparatus including a mode changeover switch which changes a pre-heat mode to an X-ray irradiation mode and vice versa, a tube current control circuit for feedback control of the X-ray tube's filament heating current to a target value, and pre-heat control circuit for controlling the filament heating current in the pre-heat mode to a target value lower than the target value in the X-ray irradiation mode. The pre-heat control circuit includes a differential amplifier which amplifies the difference between the detected voltage corresponding to a source voltage and the reference voltage determining the lower target value, so that the control signal is outputted from the differential amplifier.

REFERENCES:
patent: 4322625 (1982-03-01), Daniels et al.
patent: 4346297 (1982-08-01), Suzuki et al.

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