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power converter

A power converter, power technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, DC power input conversion to DC power output, etc., can solve the problem of large electromagnetic wave noise or switching loss, current or voltage Problems such as large time change rate and large electromagnetic wave noise can achieve the effect of reducing electromagnetic wave noise and switching loss

Inactive Publication Date: 2017-10-13
TOYO DENKI SEIZO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it becomes hard switching, and there is a problem of generating large electromagnetic wave noise and switching loss
In the case of hard switching, the temporal rate of change of the current or voltage in the circuit becomes very large at the time of switching, and there is a problem that large electromagnetic wave noise is generated along with the switching.
[0022] Additionally, for Figure 11 The conventional power converter shown is capable of power transfer from the single-phase AC voltage source 81 to the DC voltage source 6, but has the problem of being unable to perform bi-directional power transfer while maintaining soft switching.

Method used

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Embodiment 1

[0054] figure 1is a circuit diagram showing a power converter according to Embodiment 1 of the present invention. The power converter of the first embodiment includes a bridge circuit 30 , a bridge circuit 31 , and an inductor 7 . The bridge circuit 30 includes a phase bridge 1 , a phase bridge 2 connected in parallel to the phase bridge 1 , and a DC voltage source 5 connected in parallel to the phase bridge 1 and the phase bridge 2 . The bridge circuit 31 includes a phase bridge 3 , a phase bridge 4 connected in parallel to the phase bridge 3 , and a DC voltage source 6 connected in parallel to the phase bridge 3 and the phase bridge 4 . Each phase bridge 1, 2, 3, 4 uses a capacitor connected in parallel to the switching element and a diode connected in antiparallel to the switching element with a snubber switch, and the cathode of the diode is connected to the positive terminal of the snubber switch and the diode The switches with snubbers whose anodes are connected to th...

Embodiment 2

[0108] image 3 is a circuit diagram showing a power converter according to Embodiment 2 of the present invention. The power converter of embodiment 2 and figure 1 Compared with the power converter of the shown embodiment 1, it is equipped with a three-phase AC voltage source 80, a positive pole selector 9 and a negative pole selector 10 instead of figure 1 The bridge circuit 30 is different. The power converter transfers power bi-directionally between a three-phase AC voltage source and a DC voltage source.

[0109] The positive pole selector 9 is composed of three bidirectional switches 61, 62, 63 with buffers. The so-called bidirectional switch with buffer is as image 3 Connect two switches with snubbers in series in opposite directions as shown. The terminals of the bidirectional switches with snubbers 61 , 62 , 63 are respectively connected to the U-phase terminal, the V-phase terminal and the W-phase terminal of the three-phase AC voltage source 80 . In addition...

Embodiment 3

[0140] Figure 4 is a circuit diagram showing a power converter according to Embodiment 3 of the present invention. The power converter of embodiment 3 and image 3 Compared with the power converter of the illustrated embodiment 2, a transformer 8 is provided instead of image 3 The difference is that the inductor 7, the three-phase AC voltage source 80 and the DC voltage source 6 are electrically insulated through the transformer 8. The working principle of the power converter of embodiment 3 and image 3 The power converters of the illustrated second embodiment are completely the same, and thus description thereof will be omitted.

[0141] exist Figure 10 In the shown conventional power converter, the electrical isolation of the three-phase AC voltage source 80 from the DC voltage source 6 is difficult. For electrical insulation, it may be considered to insert a transformer between the three-phase AC voltage source 80 and the AC reactor 82. However, since the transform...

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Abstract

Soft switching is maintained in a power converter that can transfer power bidirectionally. Equipped with: phase bridge (1), phase bridge (2) connected in parallel with phase bridge (1), phase bridge (3), phase bridge (4) connected in parallel with phase bridge (3), and phase bridge (1, 2) A DC voltage source (5) connected in parallel, a DC voltage source (6) connected in parallel with the phase bridges (3, 4) and an inductor (7) connected between the connection terminals of the phase bridges (1, 3) . The connection terminals of the phase bridges (2, 4) are short-circuited. The switches with connectors of the phase bridges (1, 2) are switched so that the primary voltage waveform alternately repeats the voltage and reverse voltage of the DC voltage source (5) during the phase period γ via zero voltage every half cycle; the phase bridge ( 3, 4) The switch with a connector is switched so that the secondary voltage waveform has the same frequency as the primary voltage waveform and the phase lags behind the primary voltage waveform (180 degrees - control angle) every half cycle via zero voltage at the phase During this period, the voltage and the reverse voltage of the DC voltage source (6) are alternately repeated.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of Japanese Patent Application No. 2012-168644 for which it applied on July 30, 2012, and the entire disclosure content of the said application is taken in here as a reference. technical field [0003] The present invention relates to a power converter for power transmission between two DC voltage sources, a power converter for power transmission between an AC voltage source and a DC voltage source, and more particularly to converting the voltage or current when switching a switching element into Zero power converter. Background technique [0004] Conventionally, there is known a power converter that transmits power between two DC voltages (see, for example, Non-Patent Document 1). Figure 8 It is a circuit diagram showing an example of a conventional power converter that transmits power between two DC voltages. Figure 9 is showing Figure 8 A diagram of the operating waveforms of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M7/217H02M7/797
CPCH02M3/1582H02M7/217H02M7/797H02M1/0058H02M1/007Y02B70/10
Inventor 石内宏树大森洋一
Owner TOYO DENKI SEIZO KK