Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator

A linear accelerator, frequency control technology, applied in the direction of linear accelerator, automatic power control, microwave therapy, etc., can solve the problem that the resonant frequency of the accelerating tube cannot be reflected truthfully, the physical performance and index of the whole machine decrease, and the large frequency, etc., achieve error Small size, guaranteed physical properties and indicators, and wide-ranging effect tracking

Inactive Publication Date: 2010-09-15
江苏海明医疗器械有限公司
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Problems solved by technology

[0015] They all need to strictly control the temperature of the accelerating tube, otherwise, the change of the resonant frequency of the accelerating tube cannot be reflected truthfully, resulting in a relatively large frequency deviation, which will reduce the physical performance and indicators of the whole machine

Method used

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  • Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator
  • Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator
  • Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator

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Embodiment Construction

[0049] The specific implementation manner of the present invention will be described below in conjunction with the technical scheme and accompanying drawings. The AFC system structure diagram of this technical solution is shown in the attachment image 3 As shown, an application example AFC system is controlled by a single-chip microcomputer (89C52), communicates with the main control computer through the RS485 interface, and controls automatic / manual conversion, energy range switching, phase shifter voltage and manual position setting.

[0050] In the manual state, the single chip computer compares the position feedback voltage with the manual position setting to realize the open loop control through the motor drive circuit.

[0051] In the automatic state, the four-way pulse signal and the feedback signal of the position potentiometer are filtered and amplified to the DC level after being sent to the control board. The frequency signal is passed through the drive circuit to...

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Abstract

The invention discloses a self-adaptive traveling wave phase locking type frequency control system for an electronic linear accelerator. The system consists of a control circuit, a servo motor, a microwave discriminator, a reduction gearbox, a position sensor and a computer used for controlling. The system includes E wire with five shifts and X wire with two shifts and includes two working modes of manual / automatic frequency control. The system tracks the resonant frequency of an accelerating tube through adjusting the output frequency of a magnetron, thereby having the advantages of high control precision, fast following speed, wide tracking range, small errors, and the like and guaranteeing the physical properties and index of the whole machine.

Description

field of invention [0001] The invention relates to an adaptive traveling-wave phase-locked frequency control system, in particular to an adaptive traveling-wave phase-locked frequency control system for an electron linear accelerator, belonging to the field of medical radiotherapy equipment. Background technique [0002] The automatic frequency control system (abbreviated as AFC system) is a control system for the microwave frequency output by the microwave power source in the medical electron linear accelerator. Indicators are one of the key components that have always received attention. [0003] The microwave generated by the magnetron is the power source for accelerating the electrons fed into the accelerating tube. The change of the microwave frequency or the resonant frequency of the accelerating tube will cause the change of the physical index of the whole machine, such as the deviation of the output energy, the instability of the dose rate, the consistency of the do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H9/02H05H7/02A61N5/02H03L7/113
Inventor 柘江吴建兴王春波王小军高阳薛小峰邓勇
Owner 江苏海明医疗器械有限公司
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