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Wide-range step-down 18-pulse self-coupling transformer rectifier

An autotransformer, a wide range of technology, applied in the direction of transformers, fixed transformers, transformer/inductor coils/windings/connections, etc., can solve the problems of complex circuits, reduced efficiency, difficult to adjust, etc., to broaden the application range, harmonics small effect

Active Publication Date: 2016-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional 18-pulse autotransformer rectifier rectifies the output through a bridge conversion circuit, and the output voltage is high and difficult to adjust, which cannot meet the requirements of the current low-voltage DC power supply system in the aviation field.
Although the output voltage step-down regulation can be realized through the post-stage cascaded step-down circuit, the circuit is more complicated and the efficiency is reduced.

Method used

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  • Wide-range step-down 18-pulse self-coupling transformer rectifier
  • Wide-range step-down 18-pulse self-coupling transformer rectifier
  • Wide-range step-down 18-pulse self-coupling transformer rectifier

Examples

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Embodiment

[0019] Example: such as figure 1 Shown is the circuit diagram of the step-down 18-pulse autotransformer rectifier, the step-down ratio b=2, the output voltage U o =140V. The step-down 18-pulse autotransformer in the system (taking phase A as an example) has 1 set of extended windings and 3 short windings on the primary side of each phase (extended winding Aa, short windings a1a', a'b", b ″a2), the secondary side has 2 short windings (c1c, cb2), see figure 2 . The specific connection method of the winding: the first end (A) of the extended winding (Aa) of the primary side of the A phase is the voltage input end of the A phase, which is connected to the input voltage source, and the end (a) is sequentially connected with the short winding (a1a, ac2) of the secondary side of the B phase to form The middle tap a is connected to form a voltage terminal (a). The three short windings (a1a', a'b", b"a2) on the primary side of A are sequentially connected to form two voltage leads...

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Abstract

The invention discloses a wide-range step-down 18-pulse self-coupling transformer rectifier, and the transformer rectifier comprises a step-down 18-pulse self-coupling transformer, a main rectification bridge, and an auxiliary rectification bridge. Each phase of the step-down 18-pulse self-coupling transformer is provided with six windings, wherein the six windings comprise one extended winding, three short windings, and two secondary windings. Through the reasonable design of the turn ratio of the primary and secondary windings of each phase and the voltage vectors of the primary and secondary windings, the rectifier achieves the wide-range step-down of an input voltage, obtains three groups of three-phase AC voltages with the phase difference 37 degrees, and outputs the voltages through a rectification bridge circuit. The rectifier is small in current harmonics, is small in ripples of output voltages, solves a problem that the output voltage of a conventional 18-pulse self-coupling transformer rectifier is difficult to adjust, and can achieve the wide-range output of 28-280V DC voltages.

Description

technical field [0001] The invention belongs to the field of electric energy conversion, and specifically refers to a wide-range step-down type 18-pulse autotransformer rectifier. Background technique [0002] Multi-pulse rectification technology has the advantages of simple structure, high efficiency and reliability, and strong overload capacity, so it is widely used in the aviation field. According to the number of output voltage pulses, the multi-pulse rectification technology can be divided into 12 pulses, 18 pulses, 24 pulses, 30 pulses, etc., so that the grid side current becomes a ladder wave with the corresponding pulse number and the same phase as the output voltage, realizing power factor correction and harmonic Wave suppression function, and the more the number of pulses, the lower the corresponding AC side current THD value, but the more complex the transformer structure. Considering the THD value of the grid side current and the complexity of the circuit, the 1...

Claims

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Application Information

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IPC IPC(8): H02M7/04H02M5/10H01F30/02H01F27/28
CPCH01F27/28H01F30/02H02M5/10H02M7/003H02M7/04
Inventor 牛兰葛红娟杨光江帆陈思
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS