A high-power rectifier unit control circuit feedback device

Abstract

The utility model provides a kind of high-power rectifier unit control circuit feedback device, it is characterized in that, the rectifier is connected with direct current measurement sensor and rectifier transformer, the rectifier transformer valve transformer is connected with alternating current current transformer, alternating current current transformer is connected with trigger controller, and the trigger controller is connected with direct current measurement sensor.The utility model is provided with alternating current current transformer for detecting the alternating current current size of rectifier transformer output on rectifier transformer, feedback signal is changed from direct current single feedback to alternating current and direct current double feedback, when direct current single feedback problem occurs, it can be controlled by alternating current feedback, effectively ensure the stable operation of rectifier;When direct current and alternating current detection all appear problem, control fuse is disconnected, mode damages equipment, simple structure, and convenient use mode.

Description

Technical Field

[0001] This utility model belongs to the field of rectifier control technology and relates to a feedback device for a high-power rectifier unit control circuit. Background Technology

[0002] Rectification, a technology that converts alternating current (AC) to direct current (DC) to supply power to DC loads, is widely used in the manufacturing process of electrolytic products in the hydrometallurgical industry. In actual production, a multi-pulse rectifier circuit is formed by combining an on-load tap-changing rectifier transformer and a high-power rectifier unit to supply power to the electrolytic cell. The control system of the high-power rectifier unit mainly consists of a trigger pulse controller, a PLC, a touch screen, and a monitoring host. The trigger pulse controller of a traditional high-power rectifier unit is a single closed-loop constant current control system. It controls the conduction angle of the thyristors in the rectifier unit by comparing the given input current value with the actual DC current feedback value, thereby achieving constant current control. The actual DC current feedback signal is taken from a DC current measuring sensor fixed on the DC output bus of the rectifier unit, and is called DC feedback. When an open circuit occurs in the electrolytic cell or the DC current measurement sensor malfunctions, the actual DC current feedback signal is lost. This causes the trigger pulse controller to interpret the actual current value as being less than the given current value. Consequently, it controls the on-load tap-changing rectifier transformer to increase the output voltage by adjusting the tap position, thus shifting the thyristor conduction angle forward. This results in a surge in DC voltage and current, which, under the influence of high current, can lead to accidents such as smoke from the electrolytic cell and electrolyte overflow. In severe cases, it can cause thyristor breakdown in the rectifier unit, resulting in a DC current return to zero in the rectifier unit, directly impacting the production and quality of electrolytic products. Utility Model Content

[0003] The purpose of this invention is to address the problem of instability in existing single-loop control of rectifiers in the background art by providing a feedback device for the control circuit of a high-power rectifier unit.

[0004] Therefore, the present invention adopts the following technical solution:

[0005] A feedback device for a high-power rectifier unit control circuit includes a rectifier, the rectifier being connected to a DC current measuring sensor and a rectifier transformer, the rectifier transformer being connected to an AC current transformer, the AC current transformer being connected to a trigger controller, and the trigger controller being connected to the DC current measuring sensor and the rectifier.

[0006] Furthermore, the rectifier transformer is connected to the rectifier via a fuse, and the fuse is connected to the trigger controller.

[0007] Furthermore, the AC current transformer is connected to the trigger controller via an AC current feedback board.

[0008] Furthermore, the trigger controller is connected to a first alarm.

[0009] Furthermore, the trigger controller is connected to a second alarm.

[0010] The beneficial effects of this utility model are as follows: An AC current transformer for detecting the magnitude of the AC output current of the rectifier transformer is installed on the rectifier transformer. The feedback signal is changed from DC single feedback to AC and DC dual feedback. When the DC single feedback has a problem, it can be controlled through AC feedback, which effectively ensures the stable operation of the rectifier. When both DC and AC detection have problems, the fuse is controlled to open, thus preventing damage to the equipment. The structure is simple and the method of use is convenient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings:

[0013] like Figure 1 As shown, a feedback device for a high-power rectifier unit control circuit includes a rectifier. The rectifier supplies DC power to the electrolytic cell for operation. The rectifier is connected to a DC current measuring sensor for measuring the output current of the rectifier and a rectifier transformer. The rectifier transformer transforms the AC power supply to a suitable voltage before inputting it into the rectifier for operation. In this embodiment, the rectifier transformer is connected to the rectifier via a fuse. The fuse allows for timely disconnection of the power supply in case of a fault. The rectifier transformer is also connected to an AC current sensor for detecting the magnitude of the AC power supplied by the rectifier transformer to the rectifier. The AC current transformer is connected to a trigger controller. The AC current transformer can transmit the detected AC current information to the trigger controller. In this embodiment, the AC current transformer is connected to the trigger controller through an AC current feedback board. Setting up the AC current feedback board can make the AC current information transmitted to the trigger controller more accurate. The trigger controller is also connected to a DC current measuring sensor. The DC current magnitude information detected by the DC current measuring sensor can also be transmitted to the DC current measuring sensor. The trigger controller is also connected to a rectifier. The trigger controller can control the rectifier to control the output current.

[0014] In addition, the fuse is also connected to the trigger controller, which is connected to a first alarm and a second alarm. When the DC current measuring sensor detects a problem with the DC current signal, the first alarm can sound an alarm. When the AC current transformer detects a problem with the AC current signal, the second alarm can sound an alarm. When both the AC and DC current signals detected by the AC current transformer and the AC current transformer have problems, the power can be cut off through the fuse to prevent damage to the equipment.

[0015] The method of using this utility model is as follows:

[0016] During use, the DC current measuring sensor detects the DC current output by the rectifier, and the AC current transformer detects the AC current output by the transformer. If the DC current measuring sensor detects that the actual value of the DC current is less than a given threshold, the equipment operates normally, and the trigger controller performs feedback control on the rectifier through the signal transmitted by the trigger controller.

[0017] If the detected DC current value is greater than a given threshold, the controller will trigger the first alarm to sound an alarm. At the same time, the controller will also judge the AC current detected by the AC current transformer. If the AC current transformer detects that the AC current is within the threshold range, the controller will control the rectifier through the signal transmitted by the AC current transformer to ensure stable operation of the equipment. If the AC current transformer detects that the AC current is lower than the threshold, the controller will trigger the fuse to open and the first alarm to sound an alarm to prevent equipment failure.

Claims

1. A feedback device for a high-power rectifier unit control circuit, comprising a rectifier, characterized in that, The rectifier is connected to a DC current measuring sensor and a rectifier transformer. The rectifier transformer is connected to an AC current transformer. The AC current transformer is connected to a trigger controller. The trigger controller is connected to the DC current measuring sensor and the rectifier.

2. The feedback device for a high-power rectifier unit control circuit according to claim 1, characterized in that, The rectifier transformer is connected to the rectifier via a fuse, and the fuse is connected to the trigger controller.

3. The feedback device for a high-power rectifier unit control circuit according to claim 1, characterized in that, The AC current transformer is connected to the trigger controller via an AC current feedback board.

4. The feedback device for a high-power rectifier unit control circuit according to claim 1, characterized in that, The trigger controller is connected to a first alarm.

5. The feedback device for a high-power rectifier unit control circuit according to claim 1, characterized in that, The trigger controller is connected to a second alarm.

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