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DC side pulse wave multiplying circuit applied to parallel diode rectifiers

A technology of diode rectifiers and rectifiers, which is applied in the field of power electronics, can solve problems such as the difficulty in ensuring the symmetry of phase parameters, increase the energy loss of the rectifier system, and increase the complexity of the rectifier system, so as to achieve small energy loss, easy implementation, and increased complexity. Effect

Active Publication Date: 2016-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two ways to increase the pulse number of the rectifier: one is to increase the number of phase-shifting transformers or phase-shifting windings, and perform phase-shifting and multiple connections on the rectifier circuit to realize the doubling of the pulse number of the rectifier, but this method not only The complexity of the rectification system is increased, and the symmetry of phase-to-phase parameters is difficult to guarantee due to the increase in the number of phase-shifting transformers or phase-shifting windings, thereby generating non-characteristic sub-harmonics; the other is by increasing the number of taps of the balance reactor, Use the commutation effect of the rectifier element on the tap to increase the pulse number of the rectifier
However, the rectifier element on the tap is connected in series with the load circuit, and an additional diode voltage drop is added, which increases the energy loss of the rectifier system

Method used

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  • DC side pulse wave multiplying circuit applied to parallel diode rectifiers
  • DC side pulse wave multiplying circuit applied to parallel diode rectifiers
  • DC side pulse wave multiplying circuit applied to parallel diode rectifiers

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specific Embodiment approach 1

[0045] Specific implementation mode one: see figure 1 Describe this embodiment, the DC side pulse multiplication circuit applied to the parallel diode rectifier described in this embodiment, it includes a balance reactor 1 with a center tap secondary side and a single-phase full-wave rectifier 2;

[0046] One end of the primary side coil of the balanced reactor 1 with the center-tapped secondary side is connected to the positive polarity output terminal A of the first diode rectifier 3,

[0047] The other end of the primary side coil of the balanced reactor 1 with the center-tapped secondary side is connected to the positive polarity output terminal B of the second diode rectifier 4,

[0048] The center tap of the primary side coil of the balance reactor 1 with the center tap secondary side is connected to the positive terminal P of the load 5,

[0049] The center tap of the secondary coil of the balanced reactor 1 with a center-tapped secondary side is connected to the negat...

specific Embodiment approach 2

[0058] Specific implementation mode two: see Figure 1 to Figure 4 This embodiment is described. The difference between this embodiment and the DC side pulse multiplication circuit applied to the parallel diode rectifier described in the first embodiment is that the single-phase full-wave rectifier 2 includes a diode D 11 and diode D 12 ; Diode D 11 The anode of the anode is connected to one end of the secondary coil of the balance reactor 1 with a center-tapped secondary, and the diode D 12 The anode of the anode is connected to the other end of the secondary coil of the balance reactor 1 with a center-tapped secondary,

[0059] Diode D 11 the cathode and diode D 12 The cathodes of each are used as the output end of the single-phase full-wave rectifier 2.

[0060] In this embodiment, the DC side pulse multiplication circuit applied to the parallel diode rectifier according to the present invention has three working modes:

[0061] Working mode Ⅰ: see figure 2 , since ...

specific Embodiment approach 3

[0065] Specific implementation mode three: see Figure 1 to Figure 4 This embodiment is described. The difference between this embodiment and the DC side pulse multiplication circuit applied to parallel diode rectifier described in the first embodiment is that the first diode rectifier 3 is a single three-phase half-bridge rectifier, a single three-phase full-bridge rectifier, a rectifier group consisting of multiple three-phase half-bridge rectifiers with balanced reactors or a rectifier group composed of multiple three-phase full-bridge rectifiers with balanced reactors.

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Abstract

The invention provides a DC side pulse wave multiplying circuit applied to parallel diode rectifiers, belongs to the technical field of power electronics and aims at solving the problem that input current harmonics and output voltage ripples of the parallel diode rectifiers are effectively reduced under the premise of not increasing the complexity and the conduction loss of a rectifier device basically. A primary coil of a balance reactor with a center-tap secondary side is connected between a positive polarity output end A of a first diode rectifier and a positive polarity output end B of a second diode rectifier; a secondary side of the balance reactor with the center-tap secondary side is connected with two input ends of a single-phase full-wave rectifier; a centre tap of the secondary side of the balance reactor with the center-tap secondary side is connected with a negative polarity end N of a load; and an output end of the single-phase full-wave rectifier is connected with a positive polarity end P of the load. The DC side pulse wave multiplying circuit is applicable to high-current industrial occasions.

Description

technical field [0001] The invention belongs to the technical field of power electronics. Background technique [0002] As a common high-power rectification device, the parallel diode rectifier is widely used in medium-low voltage and high-current industrial occasions such as frequency conversion, electrolysis, electroplating, and metal smelting. However, due to the nonlinearity of the diode, the rectifier becomes a strongly nonlinear grid load, thus generating a large number of current harmonics; due to the limitation of the rectifier structure, when the pulse number is small, the output voltage ripple is large. In order to reduce the input current harmonics and output voltage ripple of the diode rectifier at the same time, increasing the pulse number of the diode rectifier is the most effective method. At present, there are mainly two ways to increase the pulse number of the rectifier: one is to increase the number of phase-shifting transformers or phase-shifting windings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06
CPCH02M7/06
Inventor 杨世彦王景芳杨威韩基业
Owner HARBIN INST OF TECH