Device for acquiring current feedback of high-power rectifier unit

Abstract

An acquisition device for current feedback of a high-power rectifier unit comprises an alternating-current busbar, an integrator, a current driver, a transformer, a rectifier and an IV converter, the alternating-current busbar is used for connecting a rectifier transformer valve side and a rectifier bridge, the integrator is connected with the alternating-current busbar, one end of the current driver is connected with the integrator, and the other end of the current driver is connected with the transformer. The transformer is connected with the rectifier; the rectifier is connected with the IV converter; and a Rogowski coil is arranged on the AC busbar. The device has the advantages that the input current of the rectifier transformer is directly acquired, the linearity is good, and the precision is high; the current generated in the middle is high in isolation degree and good in reliability; and the installation is easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to current feedback technical field especially relates to a kind of acquisition device of high-power rectifier unit current feedback. BACKGROUND

[0002] In the current stabilizing system of rectifying device, the size of output current needs to be acquired as feedback signal in real time, currently mainly two kinds: one is to use direct current sensor to measure output current, two is to rectify the signal of alternating current transformer inside rectifying transformer, since line TOP is same or similar, the size of this rectified output signal is linearly related to the current output by rectifier unit, the former is generally called direct current feedback, and the latter is called alternating current feedback.

[0003] High-power rectifier unit usually adopts 12-pulse rectifying transformer of high-voltage direct drop, and there are three components inside it: one step-down transformer and two rectifying transformers, and the alternating current transformer providing current signal is generally located at the valve side of rectifying transformer to reduce the volume; The alternating current transformer has two disadvantages at this position: one is that the primary voltage of alternating current transformer is high, which easily introduces interference and risk to secondary circuit, and the other is that when equivalent, rectifying transformer is also included in the circuit, thereby causing error. At the same time, in high-power rectifying system, the volume and weight of direct current sensor are relatively large, and the cost is also relatively high, so it is usually necessary to arrange separately, and since it is far away from the control system, it is easy to introduce field noise, thereby reducing signal quality.

[0004] In addition, in some projects, 12-pulse rectifying transformer is directly used in the early stage of design, and the system is not equipped with independent three-phase bridge current sensor, in this case, it is easy to cause the output of three-phase bridge to be inconsistent, thereby reducing the performance and reliability of the circuit, and if this problem is to be solved, relevant sensors need to be added, due to the problems of volume, weight and cost, it is usually difficult to implement. UTILITY MODEL CONTENTS

[0005] The technical problem solved by the utility model is to provide an acquisition device of high-power rectifier unit current feedback to solve the problems in the background technology.

[0006] The technical problem solved by the utility model is realized by adopting the following technical solutions:

[0007] An acquisition device of high-power rectifier unit current feedback, comprising an alternating current busbar for connecting the valve side of rectifying transformer and rectifying bridge, an integrator, a current driver, a transformer, a rectifier and an IV converter, wherein the integrator is connected with the alternating current busbar, one end of the current driver is connected with the integrator, the other end of the current driver is connected with the transformer, the transformer is connected with the rectifier, the rectifier is connected with the IV converter; and a Rogowski coil is arranged on the alternating current busbar.

[0008] In the utility model, the Rogowski coil is arranged at the valve side of the rectifier transformer, that is, the Rogowski coil is used to collect the alternating current signal at the input side of the rectifier circuit, and the signal can directly reflect the input of the rectifier circuit.

[0009] In the utility model, the Rogowski coil is connected with the integrator, the signal of the Rogowski coil is converted into an alternating current signal after the integrator, the transformer is driven by using the current driver, three isolated alternating currents are formed, the current signal of the three alternating currents is converted into a direct current signal after the rectifier, the direct current signal and the output direct current of the alternating bus are in linear relationship, the direct current signal is converted into a direct current voltage output by the IV converter, and external circuit sampling is provided.

[0010] In the utility model, the rectifier is a three-phase bridge rectifier circuit composed of low-voltage drop Schottky diodes.

[0011] In the utility model, the IV converter is provided with an external circuit sampling interface.

[0012] Advantages: the utility model has the following advantages:

[0013] (1) the input current of the rectifier is directly collected, the linearity is good, and the precision is high;

[0014] (2) the isolation degree is high, and the reliability is good;

[0015] (3) small in size, flexible in layout and easy to install;

[0016] (4) low in cost and easy to realize redundancy;

[0017] Based on the above advantages, the utility model is good in implementability and easy to promote. DRAWINGS

[0018] Figure 1 It is the connection schematic view of the preferable embodiment of the utility model. CONCRETE IMPLEMENTATION

[0019] In order to make the technical means, creative characteristics, purposes and effects realized by the utility model easy to understand, the utility model is further described below by combining with specific drawings.

[0020] Referring to Figure 1The shown current feedback acquisition device of a high-power rectifier unit comprises an AC busbar 1, an integrator 2, a current driver 3, a transformer 4, a rectifier 5, an IV converter 6 and a Rogowski coil 7, wherein the integrator 2 is connected with the AC busbar 1, the AC busbar 1 is connected with a valve side of a rectifier transformer and a rectifier bridge, one end of the current driver 3 is connected with the integrator 2, the other end of the current driver 3 is connected with the transformer 4, the transformer 4 is connected with the rectifier 5, the rectifier 5 is connected with the IV converter 6, and the Rogowski coil is arranged on the AC busbar 1.

[0021] In the embodiment, the Rogowski coil 7 is arranged on the valve side of the rectifier transformer, that is, the AC current signal is collected on the input side of the rectifier circuit through the Rogowski coil 7, and the signal can directly reflect the input of the rectifier circuit.

[0022] In the embodiment, the rectifier 5 is a three-phase bridge rectifier circuit composed of low-voltage drop Schottky diodes.

[0023] In the embodiment, the IV converter 6 is provided with an external circuit sampling interface P.

[0024] In the embodiment, the Rogowski coil 7 is connected with the integrator 2, the signal of the Rogowski coil 7 is converted into an AC current signal through the integrator 2, the transformer 4 is driven by the current driver 3 to form three isolated AC currents, the current signals of the three AC currents are converted into DC current signals through the rectifier 5, the DC current signals have a linear relationship with the output DC of the AC busbar 1, and the DC current signals are converted into DC voltage outputs through the IV converter 6.

[0025] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A device for obtaining current feedback of a high-power rectifier unit, comprising an AC busbar for connecting a valve side of a rectifier transformer and a rectifier bridge, an integrator, a current driver, a transformer, a rectifier and an IV converter, characterized in that The integrator is connected with an AC bus, one end of a current driver is connected with the integrator, the other end of the current driver is connected with a transformer, the transformer is connected with a rectifier, the rectifier is connected with an IV converter; and a Rogowski coil is arranged on the AC bus.

2. The device for obtaining current feedback of a high-power rectifier unit according to claim 1, characterized in that, The Rogowski coil is arranged on the valve side of the rectifier transformer.

3. The device of claim 1, wherein the device is characterized by, The Rogowski coil is connected with the integrator.

4. The device for obtaining current feedback of a high-power rectifier unit according to claim 1, characterized in that, The rectifier is a three-phase bridge rectifier circuit composed of low-voltage-drop Schottky diodes.

5. The device for obtaining current feedback of a high-power rectifier unit according to claim 1, characterized in that, An external circuit sampling interface is arranged on the IV converter.

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