Three-phase voltage sampling circuit for motor control
A three-phase voltage, sampling circuit technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring using digital measurement technology, etc., can solve the problem of high cost
Active Publication Date: 2021-02-19
SHANGHAI JINMAI ELECTRONICS TECH
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Problems solved by technology
[0004] In order to solve the common technical problem of high cost in the existing three-phase voltage sampling scheme, the present invention provides a three-phase voltage sampling circuit for motor control
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[0023]In order to solve the technical problems of high cost, low anti-interference ability, and poor reliability in the existing three-phase voltage sampling solutions, the present invention provides a three-phase voltage sampling circuit for motor control.
[0024]The preferred embodiments of the three-phase voltage sampling circuit for motor control of the present invention will be further described below in conjunction with the drawings and specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0025]CombineFigure 1 to Figure 3As shown, a three-phase voltage sampling circuit for motor control of the present invention includes three sets of proportional operation circuits 20, a reference circuit 10, and a main control unit 30; wherein, each proportional operation circuit 20 has a first input terminal and a main control unit 30. A second input terminal and an output te...
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The three-phase voltage sampling circuit for motor control of the present invention includes: three groups of proportional operation circuits, each proportional operation circuit has a first input terminal, a second input terminal and an output terminal respectively, and the first input terminals of each proportional operation circuit are respectively Connect the three-phase voltage output terminals of the motor; the reference reference circuit is used to generate a reference voltage, which is superimposed on the first input terminals of each proportional operation circuit; the main control unit, each AD terminal and the output terminal of each proportional operation circuit connect. The first input terminals of each proportional operation circuit are respectively connected to the three-phase voltage terminals; the reference voltages are respectively superimposed on the first input terminals of each proportional operation circuit, so that the three-phase voltages are connected to the same terminal, and the three-phase voltage obtains a Refer to the central point; then convert it into a low-voltage signal through a proportional operation circuit, and obtain the three-phase voltage of the motor after sampling and processing by the main control unit. The invention has the advantages of low cost, strong anti-interference ability and high reliability.
Description
Technical field[0001]The invention relates to the technical field of motors, in particular to a three-phase voltage sampling circuit for motor control.Background technique[0002]The phase voltage of the three-phase AC motor plays an important role in the motor control system. The accuracy of the detection of the three-phase voltage directly determines the accuracy of the control of the speed and torque of the three-phase motor.[0003]The current three-phase voltage sampling schemes on the market generally have the problems of high cost, low anti-interference ability, and poor reliability. Therefore, it is necessary to provide a new three-phase voltage sampling scheme to solve the problems in the prior art.Summary of the invention[0004]In order to solve the technical problem of relatively high cost in the existing three-phase voltage sampling scheme, the present invention provides a three-phase voltage sampling circuit for motor control.[0005]The three-phase voltage sampling circuit fo...
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IPC IPC(8): G01R19/25
CPCG01R19/2503
Inventor 韩伟康兵孙仕奇植万湖孙全强
Owner SHANGHAI JINMAI ELECTRONICS TECH