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

A high-voltage DC power supply and soft switching technology, applied in the direction of high-efficiency power electronic conversion, DC power input conversion to DC power output, electrical components, etc., can solve the problem of limiting the increase of X-ray machine power switching frequency and output power, which is not conducive to X-ray The miniaturization and lightweight development of optical-mechanical power supplies, the insufficient primary current to provide load current, etc., achieve the effect of improving cost performance, simplifying structure, and reducing switching loss

Inactive Publication Date: 2012-04-11
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0020] The present invention will be further specifically described in conjunction with the accompanying drawings and specific embodiments.

[0021] In this example, figure 1 It is a structural schematic block diagram of the medical full-bridge soft-switch X-ray machine DC power supply of the present invention. As shown in the figure, the full-bridge soft-switch X-ray machine high-voltage DC power supply of the present invention includes sequentially connecting the full-bridge inverter circuit 1 and LLC in series Resonant circuit 2, high-frequency high-voltage transformer 3, voltage doubler rectifier circuit 4 and control module 9.

[0022] In this example, figure 2 It is the principle diagram of the high-voltage direct current power supply for medical X-ray machine with full-bridge soft switch of the present invention. Composed of four bridge arms; the body diode of the MOSFET switch is used as a freewheeling diode to provide a path for current feedback to the power supply...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/24H02M3/335
CPCY02B70/1433Y02B70/1491Y02B70/10
Inventor 唐治德张海波张正茂杨冰谢小慧刘海龙陈秀发张晓斌舒志强
Owner CHONGQING UNIV
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