Method and device for determining input voltage of inverter circuit, magnetic resonance imaging system
A technology of inverter circuit and input voltage, which is applied in the field of determination method and device of inverter circuit input voltage, can solve the problems of IGBT module failure, power device junction temperature fluctuation, high manufacturing cost, etc., so as to improve service life and reliability, reduce loss, reducing the effect of junction temperature fluctuations
Active Publication Date: 2019-08-13
SHANGHAI NEUSOFT MEDICAL TECH LTD
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[0006] During the imaging process, the current required by the gradient coil fluctuates greatly. In this way, the current amplitude in the inverter circuit will continuously switch between high current and low current, causing the junction temperature fluctuation of the power device, and the fluctuation of the junction temperature will cause The metal leads in the power device fall off, resulting in the failure of the IGBT module, which will restrict the service life and reliability of the entire gradient power amplifier
In the existing inverter circuit, mainly in the process of manufacturing IGBT power tube, the switching performance of IGBT is improved by optimizing the processing technology, and the packaging material is optimized when the IGBT power tube is packaged to improve the life of the IGBT. , which has high requirements on the manufacturing process, the manufacturing cost is high and the effect is not significant
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0046] As described in the background technology, the current amplitude in the inverter circuit is constantly switched between high current and low current, which causes the junction temperature fluctuation of the power device, and the fluctuation of the junction temperature will cause the metal lead in the power device to fall off, thereby It leads to the failure of the power device module in the inverter circuit, which will restrict the service life and reliability of the entire gr...
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The embodiment of the present invention discloses a method for determining the input voltage of an inverter circuit. The inverter circuit provides output for the gradient coil in the magnetic resonance system. The circuit topology of the inverter circuit is composed of power switch tubes. The control The method includes: according to the relationship between the inductance voltage and the inductance current of the gradient coil, obtaining the inductance voltage value at the maximum current value in the current sequence; according to the relationship between the output voltage of the inverter circuit and the input voltage, determining when the output voltage is the inductance voltage value , the minimum DC voltage value of the inverter circuit input voltage, and the minimum DC voltage value is the target input voltage when the inverter circuit processes the current sequence. By reducing the DC input voltage, the loss of the power switching tube device in the inverter circuit can be reduced, and the junction temperature fluctuation of the device can be reduced, thereby improving the life and reliability of the entire gradient power amplifier.
Description
technical field [0001] The invention relates to the field of magnetic resonance imaging systems, in particular to a method and device for determining an input voltage of an inverter circuit, and a magnetic resonance imaging system. Background technique [0002] MRI (Magnetic Resonance Imaging, Magnetic Resonance Imaging) system is one of the most advanced medical imaging methods at present, which uses magnetic resonance phenomena to obtain electromagnetic signals from the human body and reconstruct human body information. [0003] The gradient power amplifier is the core component of the MRI system. It is input by a DC power supply, converts the DC power supply into an AC power supply, and provides a current pulse of a specific waveform to the gradient coil, so that the gradient coil generates a linearly changing gradient magnetic field in the imaging space, enabling imaging The magnetic field varies from place to place in the area, creating a picture of the human body. [...
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IPC IPC(8): H02M7/5387G01R33/36
CPCG01R33/3614H02M7/5387H02M1/0054G01R33/3852Y02B70/10
Inventor 林应锋李维成功
Owner SHANGHAI NEUSOFT MEDICAL TECH LTD