A negative high voltage direct current integrated power supply for x-ray tube and its control method

Abstract

The invention provides a negative-high-voltage direct-current integrated power supply for an X-ray tube and a control method thereof. The device comprises a negative high voltage generation module, a control module and a filament alternating voltage generation module. The negative high voltage generation module comprises a first PWM generation circuit, a first inverter circuit, a first resonance circuit, a high-frequency boosting transformer and a dual voltage rectifying circuit. The filament alternating voltage generation module comprises a second PWM generation circuit, a second inverter circuit, a second resonance circuit and a high-frequency step-down transformer. The control module comprises a sampling feedback circuit, a control circuit and an input and output control circuit. The method achieves double-loop control of negative-high-voltage direct-current voltage of the X-ray tube and tube currents of the X-ray tube, and a sliding mode variable structure is applied to a negative-high-voltage control loop with high frequency variable structure characteristics, so that a negative-high-voltage voltage stabilizing loop has good robustness. A water cooling device is generally not needed when the negative-high-voltage direct-current integrated power supply is adopted in the X-ray tube with low power, the size is small, and heat dissipation of the X-ray tube is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a negative high-voltage DC integrated power supply for X-ray tubes and a control method thereof. Background technique [0002] If the X-ray tube can generate X-rays, it needs a high-voltage DC power supply for the tube and a low-voltage filament power supply. At present, the existing high-voltage DC power supply for X-ray tubes is a positive voltage integrated power supply, which integrates the high-voltage power supply for the tube and the low-voltage power supply for the filament. Both the high-voltage tube power supply and the low-voltage filament power supply are DC positive voltage power supplies, such as figure 1 As shown, the high-voltage DC power supply leads to three wires: Terminal 5 of the high-voltage DC power supply leads to a high-voltage wire connected to the anode terminal 1 of the X-ray tube and terminal 3 of the X-ray tube, and terminal 6 of t...

AI Technical Summary

Problems solved by technology

The PID algorithm is not suitable for such control conditions. Its performance is that when the parameters of the system change, the PID algorithm cannot continue to play a control role and has poor robustness.

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