Unlock instant, AI-driven research and patent intelligence for your innovation.

Power converter

A power converter, power technology, applied in the output power conversion device, the conversion of AC power input to DC power output, the conversion of DC power input to DC power output, etc., can solve large electromagnetic wave noise or switching loss, current or voltage The problem of large time change rate and large electromagnetic wave noise can reduce electromagnetic wave noise and switching loss.

Inactive Publication Date: 2015-04-08
TOYO DENKI SEIZO KK
View PDF7 Cites 8 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power converter
  • Power converter
  • Power converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 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

[0109] 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.

[0110] 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

[0141] 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.

[0142] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In the present invention, soft-switching is maintained for a power converter that is capable of bidirectional power transfer. This power converter is equipped with a phase bridge (1), a phase bridge (2) that is connected in parallel to phase bridge (1), a phase bridge (3), a phase bridge (4) that is connected in parallel to phase bridge (3), a direct-current voltage source (5) that is connected in parallel to phase bridges (1, 2), a direct-current voltage source (6) that is connected in parallel to phase bridges (3, 4), and an inductor (7) that is connected between connection terminals of phase bridges (1, 3). Connection terminals of phase bridges (2, 4) are short-circuited to each other. Snubber-equipped switches of phase bridges (1, 2) are opened and closed such that a primary voltage waveform repeatedly alternates, while crossing zero voltage at every half cycle, between a voltage of the direct-current voltage source (5) and an inverted voltage thereof in phase periods (gamma), and snubber-equipped switches of phase bridges (3, 4) are opened and closed such that a secondary voltage waveform repeatedly alternates, while crossing zero voltage at every half cycle, at the same frequency as that of the primary voltage waveform with a phase delay (180° - control angle) from the primary voltage waveform, between a voltage of the direct-current voltage source (6) and an inverted voltage thereof in the phase periods.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M7/217H02M7/797
CPCH02M2001/007H02M7/797H02M7/217H02M2001/0058H02M3/1582Y02B70/1491H02M1/0058H02M1/007Y02B70/10
Inventor 石内宏树大森洋一
Owner TOYO DENKI SEIZO KK