X-ray tube rotor controller using the main high voltage inverter

Details X-ray tube rotor controller using the main high voltage inverter X-ray tube rotor controller using the main high voltage inverter

1992-11-02

1994-08-16

Church, Craig E.

X-ray or gamma ray systems or devices

Electronic circuit

For electrode movement

378 91, H05G 166

Patent

active

053393481

ABSTRACT:
An x-ray tube rotor controller uses the main high voltage inverters for acceleration. The rotor controller includes a DC voltage source, and a rotary anode drive circuit including a rotary anode motor designed as an induction motor. A first inverter circuit has a full bridge arrangement for accelerating the anode using a first switch to connect the induction motor to the full bridge output, and also generates high voltage for the x-ray tube. Once the anode is up to operating speed, the first switch is disconnected from the rotor causing the rotor to coast. Alternatively, a second small inverter may be employed for maintaining the rotor at speed during x-ray exposure, rather than allowing the rotor to coast. In such an instance, the first switch is disconnected from the rotor when the motor reaches a rated anode speed, and a second switch then connects the motor to the second inverter to maintain the rated anode speed. Finally, if the x-ray generator has separate anode and cathode inverters, a third small two-phase inverter may be employed in the system for driving the second phase of the anode driver motor.

REFERENCES:
patent: 4247776 (1981-01-01), Seifert
patent: 4377002 (1983-03-01), Krause et al.

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