A kind of direct current measuring device and measuring method with feedforward
A DC current, feedforward technology, applied in measuring devices, measuring electrical variables, measuring only current, etc., can solve the problems of low drift, insensitive current, affecting reliability, etc., achieve high measurement sensitivity and accuracy, avoid false Balance and improve reliability
Inactive Publication Date: 2020-03-27
天津市鑫达物业管理有限公司
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Problems solved by technology
However, the magnetic modulator has high sensitivity and low drift, but there is a false balance point in principle, which affects reliability; and although the magnetic amplifier has no false balance point, it has poor low-end performance, large initial current, and small DC current. Insensitive and prone to current overshoot and other shortcomings
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[0022] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0023] see Figure 1 to Figure 4 , a DC current measurement device with feedforward, applied to DC bus current measurement of AC-DC rectifier bridge, including:
[0024] A DC current sensor for measuring the current on the DC bus; the DC current sensor includes: a circular magnetic core 1, a detection winding 2 wound on the magnetic core, an excitation winding 4 and a feedforward compensation winding 6; the The DC bus 3 passes through the center of the magnetic core; the power source excites 5 through the resistor R 1 Form a series loop with the excitation winding 4;
[0025] An AC current sensor used to measure the current on the AC side of the rectifier bridge;
[0026] A feed-forward DC source; the feed-forward DC source, the feed-forwa...
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The invention discloses a direct current measuring device with feedforward and a measuring method thereof, and is applied to DC bus current measurement of an AC-DC rectifier bridge. The direct currentmeasuring device comprises a direct current sensor, an alternating current sensor, a feedforward DC source and a data acquisition and control module. The direct current sensor comprises a circular magnetic core and a detection winding, an excitation winding and a feedforward compensation winding which are wound on the magnetic core. The feedforward DC source, the feedforward compensation windingand a feedforward sampling resistor are connected in series in turn so as to generate the direct current which is opposite to the direction of the direct current in the bus. The data acquisition and control module comprises a null unit, a data acquisition circuit and a display and communication interface. With application of the technical scheme, the device has large measuring range and high measuring accuracy and sensitivity and has no problem of false balance; and the direct current measuring method is designed on the basis of the designed device so as to guarantee correct and efficient measurement of the direct current for the device.
Description
technical field [0001] The invention relates to the technical field of direct current sources, in particular to a direct current measuring device and a measuring method with feedforward. Background technique [0002] DC current is widely used in industrial fields, and the magnitude of DC current required in different fields is not the same, so a DC current measurement method and equipment with a wide range and sufficient accuracy are required. In the prior art, the DC sensors based on the Hall principle and the fluxgate principle that can be used for DC current measurement have a limited measurement range and will be saturated under larger DC currents; while devices for larger DC current measurements are generally based on zero magnetic It mainly includes magnetic modulation DC comparator and magnetic amplifier DC comparator. However, the magnetic modulator has high sensitivity and low drift, but there is a false balance point in principle, which affects reliability; and al...
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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 戴逸华姚成豪陈星燎李亚梅杜楠
Owner 天津市鑫达物业管理有限公司