Full-bridge soft switch medical X-ray machine high-voltage direct-current power supply

Abstract

The invention discloses a full-bridge soft switch medical X-ray machine high-voltage direct-current power supply, which comprises a full-bridge inverter circuit, an LLC (Logical Link Control) serial resonance circuit, a high-frequency high-voltage transformer, a voltage doubling rectifying circuit and a control module. An LLC serial resonance technology is adopted for the full-bridge soft switch X-ray machine high-voltage direct-current power supply, and an overlapping region does not exist between voltage and current, so that soft switch is realized, the switching loss of a switch tube is lowered, the switching frequency and output power of the converter are further increased, and the direct-current power supply has the characteristics of small size and light weight; and moreover, frequency modulation control is adopted for the high-voltage direct-current power supply, and the output voltage is not influenced by the duty factor loss, so that the adjusting range of the output voltage is widened, and the performance of the X-ray machine power supply is enhanced.

Description

technical field [0001] The invention relates to a high-voltage direct-current power supply for an X-ray machine, in particular to a high-voltage direct-current power supply for a full-bridge soft-switch X-ray machine. Background technique [0002] As a special detection equipment, X-ray machine power supply has been widely used in medical treatment. Due to the importance of X-ray machine high-voltage DC power supply to X-ray imaging, the design and research of X-ray machine power supply has attracted more and more attention. . [0003] The existing high-voltage DC power supply for medical X-ray machines adopts traditional hard switching technology. Since the switch tube is not an ideal device, switching loss will occur when the switch is turned on, and turn-off loss will occur when the switch is turned off. The higher the frequency of the X-ray machine power supply, the higher the switching loss and turn-off loss. This greatly limits the improvement of the switching freque...

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Problems solved by technology

This greatly limits the improvement of the switching frequency and output power of the X-ray machine power supply, and is also not conducive to the development of the X-ray machine power supply towards miniaturization and light weight.

[0004] On the other hand, the current resonant converters of similar products adopt phase-shift control. In the resonant converter with this control mode, the primary current is not enough to provide the load current during the commutation process of the primary current, and the secondary rectification The diodes are all turned on, the load is in the freewheeling state, and the voltage at both ends is zero, so the duty cycle of the secondary side is lost, so that the output voltage decreases

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