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Dual-three-phase half-wave rectification circuit using star-connection autotransformer

A technology of autotransformer and star connection, which is applied in the field of double-three-phase half-wave rectification circuit, can solve the problems of large capacity and volume, and achieve the effects of reducing transformer capacity, doubling current, and reducing capacity and volume

Inactive Publication Date: 2016-02-03
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of large capacity and volume of the existing double-inverted star-shaped controllable rectifier circuit with a balance reactor due to the use of a double-inverted star-shaped isolation transformer, and provides a star-connected The design method of the autotransformer

Method used

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  • Dual-three-phase half-wave rectification circuit using star-connection autotransformer
  • Dual-three-phase half-wave rectification circuit using star-connection autotransformer
  • Dual-three-phase half-wave rectification circuit using star-connection autotransformer

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specific Embodiment approach 1

[0022] Specific implementation mode 1: the following combination figure 1 Explain that the dual three-phase half-wave rectifier circuit using star-connected autotransformers described in this embodiment includes an autotransformer 1, a first group of three-phase half-wave circuits 2, a second group of three-phase half-wave circuits 3, Balance reactor 4 and load 5; autotransformer 1 input terminal and three-phase AC voltage u a , u b , u c The input terminal adopts star connection, the phase difference between the two groups of three-phase voltage and the input voltage is ±30°, that is, the output three-phase voltage of one group leads the input voltage by 30°, and the other group lags the input voltage by 30°. Output two groups of voltages with a phase difference of 60°; the input terminals of the first group of three-phase half-wave circuit 2 are connected to the output terminals a1, b1, and c1 of the autotransformer 1, and the input terminal of the second group of three-phase h...

specific Embodiment approach 2

[0024] Specific implementation manner 2: the following combination figure 1 with figure 2 , image 3 To illustrate this embodiment, this embodiment is a further limitation of the first embodiment. The autotransformer is star-connected, and the autotransformer 1 is composed of three phase-connected magnetic core legs (1) and magnetic core legs (2). ), a magnetic core column (3), and nine windings consisting of winding a, winding b, winding c, winding a1, winding b1, winding c1, winding a2, winding b2, and winding c2.

[0025] Winding a, winding b, and winding c are the input windings of the autotransformer 1, which are connected in a star shape, that is, the positive polarity is connected to the three-phase AC voltage u a , u b , u c The negative terminals are all connected to the neutral point O, winding a1, winding b1, winding c1, winding a2, winding b2, and winding c2 are the output windings of autotransformer 1, and the nine windings have the same polarity.

[0026] Winding a, w...

specific Embodiment approach 3

[0030] Specific implementation manner three: the following combination figure 1 To illustrate this embodiment, this embodiment is a further limitation to the first embodiment. The first group of three-phase half-wave circuits 2 is an uncontrollable rectifier circuit, and the first group of three-phase half-wave circuits 2 is composed of the first one, two Pole tube D 11 , The first and second diode D 12 , The first three diode D 13 composition,

[0031] The output terminal of the first group of three-phase half-wave circuit 2 is connected to the input terminal P of the balanced reactor 4.

[0032] A set of three-phase half-wave rectifier circuit only uses 3 tubes, and the number of tubes used is small.

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Abstract

The invention provides a dual-three-phase half-wave rectification circuit using a star-connection autotransformer and belongs to the field of electric and electronic technology. The problem is solved that size and capacity of an isolation transformer used by the current double-reversed star-shaped controllable rectification circuit system are increased. The dual-three-phase half-wave rectification circuit uses less rectification devices than a 12-pulse rectification circuit. For the double-reversed star-shaped controllable rectification circuit with a balance reactor, a star-connection autotransformer is used on an alternating-current side, and due to the magnetic coupling effects, to-be-converted energy is just small part of output power, so capacity and size of the transformer can be remarkably reduced, two groups of voltage of 60 DEG phase difference is connected with two groups of parallelly-connected three-phase half-wave rectification circuit; by absorbing potential difference on the direct-current side via the balance reactor, two groups of three-phase half-wave rectification circuits are allowed to work simultaneously so that six-pulse waves are formed; output current is doubled; and use rate of the transformer is further increased. The dual-three-phase half-wave rectification circuit is used for large-power rectification circuit with large current.

Description

Technical field [0001] The invention relates to a dual three-phase half-wave rectifier circuit using a star-connected autotransformer, and belongs to the technical field of power electronics. Background technique [0002] Parallel multi-phase rectifier circuits are mostly used in high-power rectifier circuits. Among them, parallel 12-pulse rectifier circuits and double reverse star rectifier circuits with balanced reactors are the most common and have been widely used in the industrial field. [0003] The parallel 12-pulse rectifier circuit uses an isolation transformer. After the isolation transformer, two groups of three-phase rectifier bridges are connected, and the output end is connected to a balanced reactor. The balanced reactor absorbs the potential difference between the two input terminals so that the two groups of three-phase rectifier bridges can work in parallel. The current doubles. Therefore, the parallel 12-pulse rectifier circuit is often used in large current app...

Claims

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Application Information

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IPC IPC(8): H02M7/23
Inventor 孟凡刚董扣杰高蕾吕正恺骆霁嵘
Owner HARBIN INST OF TECH AT WEIHAI