Power source device for dental machine grid-control cold cathode X-ray tube

Abstract

The invention discloses a power source device for a dental machine grid-control cold cathode X-ray tube, and belongs to the technical field of medical apparatuses and instruments. The power source device for the dental machine grid-control cold cathode X-ray tube is structurally composed of a high-voltage power source (1), a grid electrode power source (2), a single-chip microcomputer board (3), a grid-control bulb tube (4), current detection (5) and a closed-loop control panel (6). The power source device for the dental machine grid-control cold cathode X-ray tube is technically characterized in that the power source device does not need to be heated through filaments, the grid electrode power source is used for controlling the dental machine grid-control cold cathode X-ray tube to be opened and be closed, and the grid electrode power source controls tube current and forms closed-hoop control with the tube current. The power source device for the dental machine grid-control cold cathode X-ray tube has the advantages that a grid electrode switch ensures steepness of a leading edge and a lagging edge of a high-voltage wave form, the grid electrode power source and the tube current from closed-loop control to carry out dynamic adjustment on grid electrode voltage and the tube current, and current stability of the dental machine grid-control cold cathode X-ray tube is improved.

Description

Technical field [0001] The invention belongs to the technical field of medical devices. Background technique [0002] Most of the existing medical and dental X-ray machines use a filament power supply to provide filament current to heat the ray tube. The filament controls the tube current. The ray time is controlled by controlling the opening and closing of the high-voltage power supply. When the filament is in a cold state and a hot state, the resistance difference is large. , Temperature drift reduces the repeatability and consistency of the filament current and tube current. The filament requires preheating time when heating, the ray waveform will have a climbing phenomenon, the response speed is slow, and it cannot be synchronized with the tube current, making it difficult to achieve closed-loop control. In the pulse working mode, the climbing phenomenon will lead to the deviation between the set parameters and the actual parameters. The leading and trailing edges of the...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing medical dental X-ray machines provide filament current through the filament power supply to heat the ray tube filament to control the tube current, and control the ray time by controlling the opening and closing of the high-voltage power supply. When the filament is in a cold state and a hot state, the difference in resistance is large , the temperature drift reduces the repeatability and consistency performance of the filament current and the tube current, the filament needs warm-up time when heating, the ray waveform will have a climbing phenomenon, the response speed is slow, it cannot be synchronized with the tube current, and it is difficult to achieve closed-loop control. In the pulse working mode, the climbing phenomenon will lead to the deviation between the set parameters and the actual parameters, and the leading and trailing time of the high-voltage power supply are longer when the high-voltage power supply is turned on and off, which affects the radiation efficiency in the pulse working mode

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