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Direct-current bias current detection device

A current detection device, DC bias technology, applied in measuring devices, using AC to DC for measurement, voltage/current isolation, etc., can solve problems such as transformer core saturation

Pending Publication Date: 2021-02-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that DC bias will cause saturation of the transformer magnetic core and overcoming the deficiencies of the prior art, the present invention proposes a DC bias current detection device

Method used

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Examples

Experimental program
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Embodiment 1

[0024] In order to further describe the direct detection method in the DC bias current detection device and its method, the following will be combined figure 1 and figure 2 Make a specific introduction. The device is composed of a Hall effect sensor 2, a low-loss damping circuit 3, a silicon steel annular opening magnetic ring 4, an AC magnetic flux cancellation coil 5, a power supply input terminal 6, a voltage conversion circuit 7, an operational amplifier 8, and a filter circuit 12.

[0025] The power supply input terminal 6 is a three-terminal base, the first terminal is connected to +15V power supply, the third terminal is connected to -15V power supply, and the second terminal is connected to the ground of +15V and -15V power supply, wherein the first terminal and the ground Parallel filter capacitor C 6 , between the third terminal and ground parallel filter capacitor C 7 ; The voltage conversion circuit 7 includes a linear voltage regulator, the input terminal of t...

Embodiment 2

[0032] In order to further describe the indirect detection method in the DC bias current detection device and its method, the following is combined image 3 Make a specific introduction. The device consists of a Hall effect sensor 2, a low-loss damping circuit 3, a silicon steel annular opening magnetic ring 4, an AC magnetic flux cancellation coil 5, a power supply input terminal 6, a voltage conversion circuit 7, an operational amplifier 8, a power amplifier circuit 9, and a DC compensation The coil 10, the filter circuit 11, and the output terminal 12 are composed.

[0033] The power supply input terminal 6 is a three-terminal base, the first terminal is connected to +15V power supply, the third terminal is connected to -15V power supply, and the second terminal is connected to the ground of +15V and -15V power supply, wherein the first terminal and the ground Parallel filter capacitor C 6 , between the third terminal and ground parallel filter capacitor C 7 ; The voltag...

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Abstract

The invention relates to a direct-current bias current detection device, and belongs to the technical field of power electronics. The device is composed of an alternating-current wire (1), a Hall effect sensor (2), a low-loss damping circuit (3), an alternating-current magnetic flux counteracting coil (4), a silicon steel annular opening magnetic ring (5), a power supply input end (6), a voltage conversion circuit (7), a voltage amplification circuit (8), a filter circuit (11) and an output terminal (12), and the device can effectively measure direct-current components. Through the low-loss damping circuit provided by the invention, the circuit detection bandwidth is improved, and the response time is shorter. Therefore, the problem of direct-current magnetic bias of the transformer due tooverlarge direct-current component of the magnetic core of the transformer is avoided.

Description

technical field [0001] The invention relates to a DC bias current detection device, which belongs to the technical field of power electronics. Background technique [0002] With the development of power electronics technology, there are more and more high-power converters. For safety reasons, most circuits use transformers to isolate the low-voltage side from the high-voltage side. At the same time, with the promotion of new energy power generation and distributed power generation, they are facing grid-connection problems, and transformers are one of the indispensable equipment for grid-connection. [0003] Due to non-ideal factors in the circuit, such as unmatched drive pulse delay, limited pulse width resolution, different power devices have different turn-on and turn-off threshold voltages, and the positive and negative voltages applied to the transformer windings are not ideal. Symmetrically, this causes the volt-second integral to become unbalanced with time. This imb...

Claims

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Application Information

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IPC IPC(8): G01R19/22G01R15/20
CPCG01R19/22G01R15/202
Inventor 张瑞李思奇鲁思兆
Owner KUNMING UNIV OF SCI & TECH
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