Method for realizing grid control isolation and grid control circuit

Abstract

The invention discloses a method for realizing grid control isolation and a grid control circuit. The method comprises the following steps: firstly, generating a frequency-adjustable high-frequency square wave in a high-voltage control end of a gate control circuit; setting a required period and a duty ratio at a low-voltage control end of the gate control circuit to generate a control pulse, andtransmitting the control pulse to a high-voltage control end in an optical fiber mode to perform reduction and phase inversion in sequence to obtain two pairs of control pulses which are complementarily output in pairs; respectively receiving a high-frequency square wave and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square wave into amodulation pulse which is consistent with the control pulse in period and duty ratio; and isolating and rectifying the modulation pulse to obtain a driving pulse consistent with the period and the duty ratio of the control pulse so as to drive the grid control end of an X-ray bulb tube to be quickly opened and closed. According to the invention, the pulse width and the duty ratio can be adjusted at will. And the safety isolation problem caused by controlling the grid control end of the X-ray bulb tube during high-voltage on-off is also solved.

Description

technical field [0001] The invention relates to a method for realizing gate control isolation, and also relates to a gate control circuit adopting the method. Background technique [0002] Currently, all kinds of medical X-ray equipment on the market have high-voltage generators and X-ray tubes. The high-voltage generator is used to generate kilovolt-level DC high voltage, which can be positive high voltage or negative high voltage. DC high voltage is loaded between the cathode and anode of the X-ray tube, so that the filament in the X-ray tube is heated to generate electrons, and then bombards the anode target surface under the acceleration of the high-voltage electric field to generate X-rays. In practical applications, it is necessary to control the "presence" and "absence" of the X-rays of the X-ray tube according to a certain time sequence to achieve a certain application purpose. [0003] In the prior art, the X-ray tube is generally equipped with a grid control swit...

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Problems solved by technology

Moreover, the gate control terminal of the X-ray tube generally works at a very high voltage (thousands of volts to tens of kilovolts), which requires high safety isolation for the gate control circuit, and also needs to solve the The problem of strong interference from sparking to the gate-level control circuit

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