A multi-channel high-precision current source and its working method
A working method and multi-channel technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as not meeting high-resolution requirements, current drift, and occupying a large space
Active Publication Date: 2022-03-01
ウーハン ジョンケ ニウジン マグネティック レゾナンス テクノロジー カンパニー リミテッド
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[0015] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-channel high-precision current source and its working method for nuclear magnetic resonance spectrometers, the purpose of which is to solve the unsatisfactory existing shimming current source The technical problems of nuclear magnetic resonance spectrometer's high-resolution requirements for high-precision current control, as well as the technical problems of occupying a large space, and because of the different output biases of each component, the actual output current of each current source and the setting There are technical problems of different deviations between currents, and the technical problem that the current output by each current source will gradually drift due to the temperature drift characteristics of each component after working for a period of time
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[0085] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0086] The basic idea of the present invention is to provide a multi-channel high-precision current source for nuclear magnetic resonance spectrometer. On the one hand, it uses two output voltages of a 16-bit precision DAC to control one current source. The accuracy of the regulation current is set to be at least 6bit higher than the precision of the regulation current of the first output volt...
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The invention discloses a multi-channel high-precision current source, including a controller, a multi-channel DAC, a plurality of V / I conversion circuits, a plurality of load detection circuits, a multi-channel ADC, and a temperature sensor, the controller and the multi-channel DAC circuit The two outputs of the multi-channel DAC are electrically connected to each V / I conversion circuit, the i-th V / I conversion circuit is electrically connected to the i-th load detection circuit, and the number n of the load detection circuit is related to the number n of the V / I conversion circuit. The number is equal, each load detection circuit is electrically connected to one input of the multi-channel ADC, the multi-channel ADC is electrically connected to the controller, the temperature sensor is electrically connected to the controller, each V / I conversion circuit is connected to a corresponding load detection circuit One current source is formed, the input of the current source is two outputs of the multi-channel DAC, and the detection output of the current source is connected to one input of the multi-channel ADC. The invention can solve the technical problem that the existing shimming current source does not meet the high-resolution requirement of the nuclear magnetic resonance spectrometer for current control.
Description
technical field [0001] The invention belongs to the technical field of nuclear magnetic resonance, and more specifically relates to a multi-channel high-precision current source for a nuclear magnetic resonance spectrometer and a working method thereof. Background technique [0002] The nuclear magnetic resonance spectrometer requires that the non-uniformity of the magnetic field of the superconducting magnet in the measurement area is less than 10% of the main magnetic field -9 , in order to meet this requirement, 20-40 groups of mutually orthogonal coils are often used, and a shim current source is used to apply appropriate current to these coils, so that each group of coils generates mutually orthogonal magnetic fields whose size can be controlled by current , to cancel the inhomogeneous magnetic field in all directions. [0003] Objectively speaking, the shimming current source needs to meet the following requirements: [0004] 1) It can provide as many current circuit...
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 李正刚夏明敏曾登明李晶晶宋婵娟
Owner ウーハン ジョンケ ニウジン マグネティック レゾナンス テクノロジー カンパニー リミテッド