Variable frequency kV control system for medical diagnostic X-ray high voltage generator

A high-voltage generator and control system technology, applied in the field of medical equipment, can solve problems such as it is difficult to exceed 40Khz, the maximum switching frequency of IGBT is limited, etc., and achieve the effect of fine image quality

Inactive Publication Date: 2019-04-26
辽宁道特凯力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, most of the existing high-voltage generators use the IGBT duty cycle adjustment method to outpu

Method used

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  • Variable frequency kV control system for medical diagnostic X-ray high voltage generator
  • Variable frequency kV control system for medical diagnostic X-ray high voltage generator
  • Variable frequency kV control system for medical diagnostic X-ray high voltage generator

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Embodiment Construction

[0019] Medical diagnostic X-ray high voltage generator frequency conversion KV control system, such as figure 1 As shown, it includes two parts, the central control unit and the power inverter unit. Such as figure 2 As shown, the central control unit consists of three circuits: an outer loop PID circuit 1 composed of a high-voltage KV feedback signal; an inner loop PID circuit 2 composed of a resonance current I feedback; a frequency control circuit 3 composed of a resonance current I feedback;

[0020] Such as image 3 As shown, the first part of the outer loop PID circuit is composed of high-voltage KV feedback signal KV_fed and high-voltage KV given signal KV_ref two input signals and an operational amplifier circuit to complete the first-stage outer loop error integration. This circuit is increased by R1 and C1 A pole-zero compensation, R4 and C4 form an integrating circuit.

[0021] Such as Figure 4 As shown, the second part of the inner-loop PID circuit is composed...

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Abstract

The invention provides a variable frequency kV control system for a medical diagnostic X-ray high voltage generator. The variable frequency kV control system includes a central control unit and a power inverting unit; wherein the central control unit comprises three parts of circuits: an outer loop circuit composed of a high voltage feedback signal, an inner loop circuit composed of resonance current feedback and a frequency control circuit composed of the resonance current I feedback. The power inverting unit outputs a variable frequency square wave voltage through an H bridge composed of MOStubes connected in parallel. The generated frequency can reach 500Khz, which is much higher than a highest frequency 40Khz of a traditional high-power IGBT. High voltage kV ripples output at high frequencies are very small. The quality of image generated under low ripples is fine.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to a frequency conversion KV control system for a medical diagnostic X-ray high-voltage generator. Background technique [0002] At present, most of the existing high-voltage generators use the IGBT duty ratio adjustment method to output KV high voltage, and the maximum switching frequency of the IGBT is limited, and it is difficult to exceed 40Khz. Contents of the invention [0003] Aiming at the problems existing in the prior art, the present invention proposes a frequency conversion KV control system for medical diagnostic X-ray high-voltage generators, including a central control unit and a power inverter unit; wherein, the central control unit includes three parts of circuits: high-voltage feedback signal The outer loop circuit composed of; the inner loop circuit composed of resonant current feedback; the frequency control circuit composed of resonant current I feedback; the po...

Claims

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Application Information

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IPC IPC(8): H02M9/04H03K3/57
CPCH03K3/57
Inventor 王天睿徐婷婷
Owner 辽宁道特凯力科技有限公司
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